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This study explores the effects of initial Cr(VI) concentration, wavelength, hole-scavenger (absence and presence of salicylic acid), and oxygen conditions (aeration by air, nitrogen gas, and mechanical stir only) on photocatalytic reduction of hexavalent chromium over titanium dioxide photocatalyst and the chromic species distribution after photocatalysis. The experimental results show the existence of strong interactions between these factors. The factor of hole-scavenger was more important than the UV light wavelength condition for a reduction of 3 mg Cr(VI) L−1, whereas both factors became important when Cr(VI) concentration increased to 20 mgL−1. The higher the UV wavelength was, the less the amount of chromium retained on the TiO2 surface. The influence of oxygen-containing conditions in the solution on the reduction of 3 mgL−1 Cr(VI) was unobvious, whereas its influence became remarkable for the reduction of 20 mgL−1 Cr(VI) in the presence of SA. The interaction between oxygen-containing factor and other environmental factors, such as Cr(VI) concentration and scavenger presence (SA in this study), is a key factor about the degree of oxygen effect on Cr(VI) photo-reduction and the chromic species distribution. Simple stirring obtained better photocatalytic efficiency than aeration by air or nitrogen gas.
Chih-Chi Yang; Khanh-Chau Dao; Yo-Sheng Lin; Teng-Yun Cheng; Ku-Fan Chen; Yung-Pin Tsai. Impacts of Mixing Mode on Photocatalytic Reduction of Hexavalent Chromium over Titanium Dioxide Nanomaterial under Various Environmental Conditions. Water 2021, 13, 2291 .
AMA StyleChih-Chi Yang, Khanh-Chau Dao, Yo-Sheng Lin, Teng-Yun Cheng, Ku-Fan Chen, Yung-Pin Tsai. Impacts of Mixing Mode on Photocatalytic Reduction of Hexavalent Chromium over Titanium Dioxide Nanomaterial under Various Environmental Conditions. Water. 2021; 13 (16):2291.
Chicago/Turabian StyleChih-Chi Yang; Khanh-Chau Dao; Yo-Sheng Lin; Teng-Yun Cheng; Ku-Fan Chen; Yung-Pin Tsai. 2021. "Impacts of Mixing Mode on Photocatalytic Reduction of Hexavalent Chromium over Titanium Dioxide Nanomaterial under Various Environmental Conditions." Water 13, no. 16: 2291.
Adsorbent made by carbonization of biomass under oxygen-limited conditions has become a promising material for wastewater treatment owing to its cost-effective, simple, and eco-friendly processing method. Ultrasound is considered a green technique to modify carbon materials because it uses water as the solvent. In this study, a comparison of Reactive Black 5 (RB5) adsorption capacity between biochar (BC) generated by pyrolysis of water bamboo (Zizania latifolia) husks at 600 °C and ultrasound-assisted biochar (UBC) produced by pyrolysis at 600 °C assisted by ultrasonic irradiation was performed. UBC showed a greater reaction rate and reached about 80% removal efficiency after 4 h, while it took 24 h for BC to reach that level. Scanning electron microscope (SEM) images indicated that the UBC morphology surface was more porous, with the structure of the combination of denser mesopores enhancing physiochemical properties of UBC. By Brunauer, Emmett, and Teller (BET), the specific surface areas of adsorbent materials were analyzed, and the surface areas of BC and UBC were 56.296 m2/g and 141.213 m2/g, respectively. Moreover, the pore volume of UBC was 0.039 cm3/g, which was higher than that of BC at 0.013 cm3/g. The adsorption isotherms and kinetics revealed the better fits of reactions to Langmuir isotherm and pseudo-second-order kinetic model, indicating the inclination towards monolayer adsorption and chemisorption of RB5 on water bamboo husk-based UBC.
Thanh Nguyen; Hung-Hsiang Chen; Thi To; Yu-Chen Chang; Cheng-Kuo Tsai; Ku-Fan Chen; Yung-Pin Tsai. Development of Biochars Derived from Water Bamboo (Zizania latifolia) Shoot Husks Using Pyrolysis and Ultrasound-Assisted Pyrolysis for the Treatment of Reactive Black 5 (RB5) in Wastewater. Water 2021, 13, 1615 .
AMA StyleThanh Nguyen, Hung-Hsiang Chen, Thi To, Yu-Chen Chang, Cheng-Kuo Tsai, Ku-Fan Chen, Yung-Pin Tsai. Development of Biochars Derived from Water Bamboo (Zizania latifolia) Shoot Husks Using Pyrolysis and Ultrasound-Assisted Pyrolysis for the Treatment of Reactive Black 5 (RB5) in Wastewater. Water. 2021; 13 (12):1615.
Chicago/Turabian StyleThanh Nguyen; Hung-Hsiang Chen; Thi To; Yu-Chen Chang; Cheng-Kuo Tsai; Ku-Fan Chen; Yung-Pin Tsai. 2021. "Development of Biochars Derived from Water Bamboo (Zizania latifolia) Shoot Husks Using Pyrolysis and Ultrasound-Assisted Pyrolysis for the Treatment of Reactive Black 5 (RB5) in Wastewater." Water 13, no. 12: 1615.
Due to various potential toxicological threats to living organisms even at low concentrations, pharmaceuticals and personal care products in natural water are seen as an emerging environmental issue. The low efficiency of removal of pharmaceuticals and personal care products by conventional wastewater treatment plants calls for more efficient technology. Research on advanced oxidation processes has recently become a hot topic as it has been shown that these technologies can effectively oxidize most organic contaminants to inorganic carbon through mineralization. Among the advanced oxidation processes, the electrochemical advanced oxidation processes and, in general, electrochemical oxidation or anodic oxidation have shown good prospects at the lab-scale for the elimination of contamination caused by the presence of residual pharmaceuticals and personal care products in aqueous systems. This paper reviewed the effectiveness of electrochemical oxidation in removing pharmaceuticals and personal care products from liquid solutions, alone or in combination with other treatment processes, in the last 10 years. Reactor designs and configurations, electrode materials, operational factors (initial concentration, supporting electrolytes, current density, temperature, pH, stirring rate, electrode spacing, and fluid velocity) were also investigated.
Khanh Chau Dao; Chih-Chi Yang; Ku-Fan Chen; Yung-Pin Tsai. Recent Trends in Removal Pharmaceuticals and Personal Care Products by Electrochemical Oxidation and Combined Systems. Water 2020, 12, 1043 .
AMA StyleKhanh Chau Dao, Chih-Chi Yang, Ku-Fan Chen, Yung-Pin Tsai. Recent Trends in Removal Pharmaceuticals and Personal Care Products by Electrochemical Oxidation and Combined Systems. Water. 2020; 12 (4):1043.
Chicago/Turabian StyleKhanh Chau Dao; Chih-Chi Yang; Ku-Fan Chen; Yung-Pin Tsai. 2020. "Recent Trends in Removal Pharmaceuticals and Personal Care Products by Electrochemical Oxidation and Combined Systems." Water 12, no. 4: 1043.
We investigated a light emitting diode (LED) lighting system applied to a water bamboo field during winter season at night, and the results indicated that this lighting system can prevent the stunting of water bamboo leaves and further assist its growth. Compared with previous LED systems, in which the LED bulbs were placed directly above water bamboo leaves, our LED lighting system presents the benefit of easy handling during harvest. To prevent the inhomogeneous coverage of LED light patterns, a new design of LED lenses was also incorporated.
Vincent K. S. Hsiao; Teng-Yun Cheng; Chih-Feng Chen; Hao Shiu; Yong-Jin Yu; Chun-Fu Tsai; Pin-Chen Lai; Min-Chia Tsai; Chih-Chi Yang; Hung-Yu Chien; Ku-Fan Chen; Yung-Pin Tsai. Optimized LED-Integrated Agricultural Facilities for Adjusting the Growth of Water Bamboo (Zizania latifolia). Applied Sciences 2020, 10, 1330 .
AMA StyleVincent K. S. Hsiao, Teng-Yun Cheng, Chih-Feng Chen, Hao Shiu, Yong-Jin Yu, Chun-Fu Tsai, Pin-Chen Lai, Min-Chia Tsai, Chih-Chi Yang, Hung-Yu Chien, Ku-Fan Chen, Yung-Pin Tsai. Optimized LED-Integrated Agricultural Facilities for Adjusting the Growth of Water Bamboo (Zizania latifolia). Applied Sciences. 2020; 10 (4):1330.
Chicago/Turabian StyleVincent K. S. Hsiao; Teng-Yun Cheng; Chih-Feng Chen; Hao Shiu; Yong-Jin Yu; Chun-Fu Tsai; Pin-Chen Lai; Min-Chia Tsai; Chih-Chi Yang; Hung-Yu Chien; Ku-Fan Chen; Yung-Pin Tsai. 2020. "Optimized LED-Integrated Agricultural Facilities for Adjusting the Growth of Water Bamboo (Zizania latifolia)." Applied Sciences 10, no. 4: 1330.
In this study, a farmland contaminated by heavy metals (Cu, Zn, Ni, and Cr) was selected to evaluate the performance of poly-γ-glutamic acid (γ-PGA) on the removal of heavy metals in soil washing. The highest heavy metal concentrations at the contaminated site were Cu: 1180 mg/kg, Zn: 1450 mg/kg, Ni: 287 mg/kg, and Cr: 316 mg/kg. Batch experiments designed by Taguchi Method were conducted first to assess the effect of different washing conditions on the removal of heavy metals in laboratory. The results of batch experiments show that factors that affected the removal efficiency of heavy metals was of the order γ-PGA concentration > washing time > liquid/soil ratio > rotational speed. The optimal operating parameters for heavy metal removal were γ-PGA 3.5%, liquid/soil ratio 15/1, washing time 60 min, and rotational speed 100 rpm. Under the optimal conditions, up to 50.7% of the major target metal, Cu, was removed. Heavy metals in the soil were mainly Fe-Mn oxide bound and organically bound. On-site treatment using the optimal operating parameters caused 54.3% of Cu removal. When the soil was washed 3 times by γ-PGA, the removal efficiency of Cu was improved to 74.3%. After the treatment, the change in soil bacterial number was insignificant, indicating that γ-PGA is an environmentally friendly washing reagent.
Yen-Ping Peng; Yu-Chen Chang; Ku-Fan Chen; Ching-Hsiang Wang. A field pilot-scale study on heavy metal-contaminated soil washing by using an environmentally friendly agent—poly-γ-glutamic acid (γ-PGA). Environmental Science and Pollution Research 2019, 27, 34760 -34769.
AMA StyleYen-Ping Peng, Yu-Chen Chang, Ku-Fan Chen, Ching-Hsiang Wang. A field pilot-scale study on heavy metal-contaminated soil washing by using an environmentally friendly agent—poly-γ-glutamic acid (γ-PGA). Environmental Science and Pollution Research. 2019; 27 (28):34760-34769.
Chicago/Turabian StyleYen-Ping Peng; Yu-Chen Chang; Ku-Fan Chen; Ching-Hsiang Wang. 2019. "A field pilot-scale study on heavy metal-contaminated soil washing by using an environmentally friendly agent—poly-γ-glutamic acid (γ-PGA)." Environmental Science and Pollution Research 27, no. 28: 34760-34769.
NRC03-DA/nRGO possessed biocompatible properties and NIR photothermal energy conversion capability. The continuous photoinduced NRC03 peptide release consequently improved the therapeutic efficiency of photothermal therapy against S. aureus.
Y. C. Chen; K. Y. A. Lin; C. C. Lin; T. Y. Lu; Y. H. Lin; K. F. Chen. Photoinduced antibacterial activity of NRC03 peptide-conjugated dopamine/nano-reduced graphene oxide against Staphylococcus aureus. Photochemical & Photobiological Sciences 2019, 18, 2442 -2448.
AMA StyleY. C. Chen, K. Y. A. Lin, C. C. Lin, T. Y. Lu, Y. H. Lin, K. F. Chen. Photoinduced antibacterial activity of NRC03 peptide-conjugated dopamine/nano-reduced graphene oxide against Staphylococcus aureus. Photochemical & Photobiological Sciences. 2019; 18 (10):2442-2448.
Chicago/Turabian StyleY. C. Chen; K. Y. A. Lin; C. C. Lin; T. Y. Lu; Y. H. Lin; K. F. Chen. 2019. "Photoinduced antibacterial activity of NRC03 peptide-conjugated dopamine/nano-reduced graphene oxide against Staphylococcus aureus." Photochemical & Photobiological Sciences 18, no. 10: 2442-2448.
The purpose of this study was to study how temperature variation affects the tolerance of phosphorus accumulating organisms (PAOs) in a toxic environment. To exclude the interference of glycogen accumulating organisms (GAOs), shock loading experiments were conducted to study the effect of Cu(II) toxicity on the metabolisms of PAOs in 10, 20, and 30 °C conditions. The experimental data showed that the temperature effects on aerobic phosphorus uptake, PHA degradation, and glycogen synthesis were remarkable in the presence of Cu(II). Nevertheless, insignificant effects on anaerobic phosphorus release and PHA synthesis were found. The largest inhibition of PAO metabolism occurred in the low temperature case (10 °C). This study also experimentally demonstrated the loss of PAO metabolic ability in the subsequent aerobic stage, after the anaerobic stage. The presence of Cu(II) toxicity mainly resulted from the inhibition of biochemical reactions in the aerobic stage, and it was irrelevant to the inhibition of previous anaerobic metabolisms.
Chen-Chiang Chou; Chih-Chi Yang; Meng-Shan Lu; Li-Yuan Hu; Ku-Fan Chen; Yung-Pin Tsai. The Influence of Temperature on Metabolisms of Phosphorus Accumulating Organisms in Biological Wastewater Treatment Plants in the Presence of Cu(II) Toxicity. Applied Sciences 2019, 9, 1126 .
AMA StyleChen-Chiang Chou, Chih-Chi Yang, Meng-Shan Lu, Li-Yuan Hu, Ku-Fan Chen, Yung-Pin Tsai. The Influence of Temperature on Metabolisms of Phosphorus Accumulating Organisms in Biological Wastewater Treatment Plants in the Presence of Cu(II) Toxicity. Applied Sciences. 2019; 9 (6):1126.
Chicago/Turabian StyleChen-Chiang Chou; Chih-Chi Yang; Meng-Shan Lu; Li-Yuan Hu; Ku-Fan Chen; Yung-Pin Tsai. 2019. "The Influence of Temperature on Metabolisms of Phosphorus Accumulating Organisms in Biological Wastewater Treatment Plants in the Presence of Cu(II) Toxicity." Applied Sciences 9, no. 6: 1126.
Dispersants including Tween 20, Tween 40, Tween 60, and polyacrylic acid (PAA) were used to modify nanoscale zero-valent iron (nZVI). All dispersants dispersed nZVI effectively. PAA-modified nZVI was more stable than nZVI that was modified with Tween surfactant. Iron nanoparticles that were prepared using 0.5–5.0% (vol%) of PAA remained in suspension for more than 2 h. nZVI that was modified using Tween surfactant remained in suspension for 30–60 min, and there was complete sedimentation of bare iron in 10 min. When 2.0–5.0% (vol%) of Tween surfactant was used, the stability of the nZVI that was modified using Tween 20 was much better than that for nZVI that was modified using Tween 40 or Tween 60. The results for the transportation test show that nZVI that was prepared using 2% (vol%) of Tween 20 exhibited the best mobility in porous media. Approximately 83–90% of TCE was degraded by bare, PAA-modified, and Tween 20-modified nZVI, and about 63–67% of TCE was removed by nZVI that was modified using Tween 40 and Tween 60 during 20 days of reaction. The production of cis-dichloroethene (DCE) and 1,1-DCE demonstrates that TCE is removed via reductive dechlorination. The results of this study show that PAA- and Tween 20-modified nZVI are more practical for in situ remediation because they exhibit good mobility and degrade TCE effectively.
Yen-Ping Peng; Ting-Yu Chen; Chun-Yi Wu; Yu-Chen Chang; Ku-Fan Chen. Dispersant-modified iron nanoparticles for mobility enhancement and TCE degradation: a comparison study. Environmental Science and Pollution Research 2018, 26, 34157 -34166.
AMA StyleYen-Ping Peng, Ting-Yu Chen, Chun-Yi Wu, Yu-Chen Chang, Ku-Fan Chen. Dispersant-modified iron nanoparticles for mobility enhancement and TCE degradation: a comparison study. Environmental Science and Pollution Research. 2018; 26 (33):34157-34166.
Chicago/Turabian StyleYen-Ping Peng; Ting-Yu Chen; Chun-Yi Wu; Yu-Chen Chang; Ku-Fan Chen. 2018. "Dispersant-modified iron nanoparticles for mobility enhancement and TCE degradation: a comparison study." Environmental Science and Pollution Research 26, no. 33: 34157-34166.
This study examines the effects of noise reflected from the overpass bottom under various conditions using onsite measurements and model simulation. Reflected noise from the overpass bottom may be as high as 8 dB(A). Bottom materials (steel and reinforced concrete (RC)) have no discernible effect on the reflected noise level. As the height of an overpass increases, the level of reflected noise decreases. When an overpass is parallel to the noise source (i.e., the freeway), the size of the area impacted by reflected noise increases. As the sound absorption rating of the material installed at the overpass bottom increased, the level of reflected noise decreased. A sound absorbing material with a sound absorption rate of at least 0.60 is recommended to reduce reflected noise level. When the distance between the overpass side and a receiver exceeded 30 m, the level of reflected noise level reduced significantly. Therefore, if the distance between a residential area and overpass could be increased to create a buffer zone coupled with the installation of sound absorbing material at the overpass bottom, the impact of reflected noise on nearby residents can be reduced.
Chi-Chwen Lin; Yen-Ping Peng; Yung-Pin Tsai; Yu-Chen Chang; Ku-Fan Chen. Impact and Control of Reflected Noise from an Overpass Bottom. Applied Sciences 2018, 8, 1908 .
AMA StyleChi-Chwen Lin, Yen-Ping Peng, Yung-Pin Tsai, Yu-Chen Chang, Ku-Fan Chen. Impact and Control of Reflected Noise from an Overpass Bottom. Applied Sciences. 2018; 8 (10):1908.
Chicago/Turabian StyleChi-Chwen Lin; Yen-Ping Peng; Yung-Pin Tsai; Yu-Chen Chang; Ku-Fan Chen. 2018. "Impact and Control of Reflected Noise from an Overpass Bottom." Applied Sciences 8, no. 10: 1908.
Over the past few years, National Chi Nan University (NCNU) has made significant achievements in its development as a “green university.” Besides continuing to implement sustainable development of its campus, NCNU has also been implementing the “Citizenship Cultivation Plan,” “University without Boundary Project” and “University Social Responsibility (USR) Plan,” using the local community as a test-bed, and working actively to integrate NCNU’s curriculum with the community, so as to enhance awareness of local environmental issues among students, faculty members and local residents, and build consensus of sustainable environmental development. NCNU has implemented a range of action plans and practical courses of environmental education to work together with local residents for environmental issues, such as water resources, air quality, waste, etc. Through these activities, NCNU’s students and faculty members and local residents are able to develop a better understanding of the environment, and how they can make a bigger contribution towards environmental protection. Regarding the international voluntary service activities, NCNU has endeavored to fulfil its social responsibility as a university. Under the dynamic leadership of President Dr. Yuh-Long Su, College of Science and Technology and College of Management have joined forces with “Chunghwa International Sunshine Charitable Association” established by Taiwanese businesspeople in Southeast Asia, using NCNU’s knowhow and technology to build the water purification systems in Cambodia, providing clean and safe drinking water for people in remote and disadvantaged areas. NCNU has strongly rooted in the local community with the content of the United Nations’ Sustainable Development Goals (SDGs) to build capabilities in four key areas - educational development, local action, industry-academia collaboration, and global integration - and to expand the scope of its activities from the local to the international. In the future, NCNU will continue devoting itself to sustainability and environmental issues, working wholeheartedly to meet its social responsibility goals as a university.
Yuhlong Oliver Su; Ku-Fan Chen; Yung-Pin Tsai; Hui-I Su. How universities can work together with local communities to create a green, sustainable future. E3S Web of Conferences 2018, 48, 06001 .
AMA StyleYuhlong Oliver Su, Ku-Fan Chen, Yung-Pin Tsai, Hui-I Su. How universities can work together with local communities to create a green, sustainable future. E3S Web of Conferences. 2018; 48 ():06001.
Chicago/Turabian StyleYuhlong Oliver Su; Ku-Fan Chen; Yung-Pin Tsai; Hui-I Su. 2018. "How universities can work together with local communities to create a green, sustainable future." E3S Web of Conferences 48, no. : 06001.
This study employed BiOI-deposited TiO nanotube arrays (BiOI-TNTAs) electrode in a photoelectrochemical (PEC) system to oxidize Ibuprofen and generate hydrogen in the anodic and cathodic chamber, respectively. FESEM results revealed the diameter of TiO nanotubes was 90-110nm. According to the XRD analysis, the BiOI-TNTAs were dominated by the anatase phase and tetragonal structure of BiOI. XPS results confirmed the coexistence of BiOI in the BiOI-TNTAs associated with Bi (33.76%) and I (8.81%). UV-vis absorption spectra illustrated BiOI-TNTAs exhibit strong absorptions in the visible light region. The PEC method showed the best degradation efficiency for Ibuprofen is a rate constant of 3.21×10min. The results of the Nyquist plot revealed the recombination of photogenerated electron-hole pairs was inhibited as the bias potential was applied. Furthermore, the Bode plot demonstrated the lifetime (τ) of photoexcited electrons of BiOI-TNTAs was 1.8 and 4.1 times longer than that of BiOI-Ti and TNTAs, respectively. In the cathodic chamber, the amount of hydrogen generation reached 219.94μM/cm after 3h of reaction time.
Hanlin Chen; Yen-Ping Peng; Ting-Yu Chen; Ku-Fan Chen; Ken-Lin Chang; Zhi Dang; Gui-Ning Lu; Hongping He. Enhanced photoelectrochemical degradation of Ibuprofen and generation of hydrogen via BiOI-deposited TiO2 nanotube arrays. Science of The Total Environment 2018, 633, 1198 -1205.
AMA StyleHanlin Chen, Yen-Ping Peng, Ting-Yu Chen, Ku-Fan Chen, Ken-Lin Chang, Zhi Dang, Gui-Ning Lu, Hongping He. Enhanced photoelectrochemical degradation of Ibuprofen and generation of hydrogen via BiOI-deposited TiO2 nanotube arrays. Science of The Total Environment. 2018; 633 ():1198-1205.
Chicago/Turabian StyleHanlin Chen; Yen-Ping Peng; Ting-Yu Chen; Ku-Fan Chen; Ken-Lin Chang; Zhi Dang; Gui-Ning Lu; Hongping He. 2018. "Enhanced photoelectrochemical degradation of Ibuprofen and generation of hydrogen via BiOI-deposited TiO2 nanotube arrays." Science of The Total Environment 633, no. : 1198-1205.
This study uses a trichloroethene (TCE)-contaminated site to determine the efficacy of persulfate oxidation for the treatment of TCE-contaminated groundwater.
Yu-Chen Chang; Ting-Yu Chen; Yung-Pin Tsai; Ku-Fan Chen. Remediation of trichloroethene (TCE)-contaminated groundwater by persulfate oxidation: a field-scale study. RSC Advances 2018, 8, 2433 -2440.
AMA StyleYu-Chen Chang, Ting-Yu Chen, Yung-Pin Tsai, Ku-Fan Chen. Remediation of trichloroethene (TCE)-contaminated groundwater by persulfate oxidation: a field-scale study. RSC Advances. 2018; 8 (5):2433-2440.
Chicago/Turabian StyleYu-Chen Chang; Ting-Yu Chen; Yung-Pin Tsai; Ku-Fan Chen. 2018. "Remediation of trichloroethene (TCE)-contaminated groundwater by persulfate oxidation: a field-scale study." RSC Advances 8, no. 5: 2433-2440.
This study develops a low-energy rotating photocatalytic contactor (LE-RPC) that has Cu-doped TiO2 films coated on stainless-steel rotating disks, to experimentally evaluate the efficiency of the degradation and decolorization of methylene blue (MB) under irradiation from different light sources (visible 430 nm, light-emitting diode [LED] 460 nm, and LED 525 nm). The production of hydroxyl radicals is also examined. The experimental results show that the photocatalytic activity of TiO2 that is doped with Cu2+ is induced by illumination with visible light and an LED. More than 90% of methylene blue at a 10 mg/L concentration is degraded after illumination by visible light (430 nm) for 4 hr at 20 rpm. This study also demonstrates that the quantity of hydroxyl radicals produced is directly proportional to the light energy intensity. The greater the light energy intensity, the greater is the number of hydroxyl radicals produced. Implications: The CuO-doped anatase TiO2 powder was successfully synthesized in this study by a sol–gel method. The catalytic abilities of the stainless-steel film were enhanced in the visible light regions. This study has successfully modified the nano-photocatalytic materials to drop band gap and has also successfully fixed the nano-photocatalytic materials on a substratum to effectively treat dye wastewater in the range of visible light. The results can be useful to the development of a low-energy rotating photocatalytic contactor for decontamination purposes.
Chih-Chi Yang; Ruey-An Doong; Ku-Fan Chen; Giin-Shan Chen; Yung-Pin Tsai. The photocatalytic degradation of methylene blue by green semiconductor films that is induced by irradiation by a light-emitting diode and visible light. Journal of the Air & Waste Management Association 2017, 68, 29 -38.
AMA StyleChih-Chi Yang, Ruey-An Doong, Ku-Fan Chen, Giin-Shan Chen, Yung-Pin Tsai. The photocatalytic degradation of methylene blue by green semiconductor films that is induced by irradiation by a light-emitting diode and visible light. Journal of the Air & Waste Management Association. 2017; 68 (1):29-38.
Chicago/Turabian StyleChih-Chi Yang; Ruey-An Doong; Ku-Fan Chen; Giin-Shan Chen; Yung-Pin Tsai. 2017. "The photocatalytic degradation of methylene blue by green semiconductor films that is induced by irradiation by a light-emitting diode and visible light." Journal of the Air & Waste Management Association 68, no. 1: 29-38.
Alkaline-activated persulfate accelerates the degradation of 1,2-dichloroethane (1,2-DCA) while the rate of degradation of methyl tert -butyl ether (MTBE) in alkaline-activated persulfate system is decreased. In this study, alkaline-activated persulfate is used to treat groundwater that is contaminated with 1,2-dichloroethane (1,2-DCA)- and methyl tert -butyl ether (MTBE). The results show that alkaline-activated persulfate accelerates the degradation of 1,2-DCA. Vinyl chloride is produced because there is dehydrochlorination of 1,2-DCA at high pH. Although the rate of degradation of MTBE in alkaline-activated persulfate systems is decreased, there is a significant reduction in the accumulation of MTBE-degrading byproducts, tert -butyl alcohol and tert -butyl formate. Alkaline-activated persulfate degrades 1,2-DCA via the mechanisms of oxidation and dehydrochlorination, but oxidation alone contributes to the removal of MTBE. The use of low-cost basic oxygen furnace (BOF) slag increases the pH of the solution (>12) and allows the alkaline-activated persulfate reaction to proceed. No detectable heavy metals are released from the BOF slag in the persulfate system that is activated by BOF slag. The degradation of 1,2-DCA and MTBE follows the pseudo-first-order kinetics for all persulfate systems. Alkaline-activated persulfate causes a decrease in ORP because there is a high pH, which adversely affects the removal of contaminants if the contaminants do not undergo base-mediated degradation. Therefore, the performance in terms of contaminant removal must be evaluated before alkaline-activated persulfate is used for different compounds. This novel, slag-activated persulfate system is an environmentally friendly and cost-effective alternative to the remediation of groundwater.
Ku-Fan Chen; Yu-Chen Chang; Kuan-Yu Liu. A kinetic and mechanistic study of the degradation of 1,2-dichloroethane and methyl tert-butyl ether using alkaline-activated persulfate oxidation. RSC Advances 2016, 6, 75578 -75587.
AMA StyleKu-Fan Chen, Yu-Chen Chang, Kuan-Yu Liu. A kinetic and mechanistic study of the degradation of 1,2-dichloroethane and methyl tert-butyl ether using alkaline-activated persulfate oxidation. RSC Advances. 2016; 6 (79):75578-75587.
Chicago/Turabian StyleKu-Fan Chen; Yu-Chen Chang; Kuan-Yu Liu. 2016. "A kinetic and mechanistic study of the degradation of 1,2-dichloroethane and methyl tert-butyl ether using alkaline-activated persulfate oxidation." RSC Advances 6, no. 79: 75578-75587.
This study employed microwave-assisted hydrothermal method to synthesize Ti-MCM-41, which are mesoporous materials with a high surface area and excellent photocatalytic ability. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and ultraviolet–visible spectroscopy (UV–Vis) were employed. The XRD findings showed that Ti-MCM-41 exhibited a peak at 2θ of 2.2°, which was attributed to the hexagonal MCM-41 structure. The BET (Brunauer–Emmett–Teller) results agreed with the TEM findings that Ti-MCM-41 has a pore size of about 3–5 nm and a high surface area of 883 m2/g. FTIR results illustrated the existence of Si–O–Si and Si–O–Ti bonds in Ti-MCM-41. The appearance of Ti 2p peaks in the XPS results confirmed the FTIR findings that the Ti was successfully doped into the MCM-41 structure. Zeta (ζ)-potential results indicated that the iso-electric point (IEP) of Ti-MCM-41 was at about pH 3.02. In this study, the photocatalytic degradation of oxytetracycline (OTC) at different pH was investigated under Hg lamp irradiation (wavelength 365 nm). The rate constant (K′obs) for OTC degradation was 0.012 min− 1 at pH 3. Furthermore, TOC (total organic carbon) and high resolution LC–MS (liquid chromatography–mass spectrometry) analyses were conducted to elucidate the possible intermediate products and degradation pathway for OTC. The TOC removal efficiency of OTC degradation was 87.0%, 74.4% and 50.9% at pH 3, 7 and 10, respectively. LC–MS analysis results showed that the degradation products from OTC resulted from the removal of functional groups from the OTC ring.
Hanlin Chen; Yen-Ping Peng; Ku-Fan Chen; Chia-Hsiang Lai; Yung-Chang Lin. Rapid synthesis of Ti-MCM-41 by microwave-assisted hydrothermal method towards photocatalytic degradation of oxytetracycline. Journal of Environmental Sciences 2016, 44, 76 -87.
AMA StyleHanlin Chen, Yen-Ping Peng, Ku-Fan Chen, Chia-Hsiang Lai, Yung-Chang Lin. Rapid synthesis of Ti-MCM-41 by microwave-assisted hydrothermal method towards photocatalytic degradation of oxytetracycline. Journal of Environmental Sciences. 2016; 44 ():76-87.
Chicago/Turabian StyleHanlin Chen; Yen-Ping Peng; Ku-Fan Chen; Chia-Hsiang Lai; Yung-Chang Lin. 2016. "Rapid synthesis of Ti-MCM-41 by microwave-assisted hydrothermal method towards photocatalytic degradation of oxytetracycline." Journal of Environmental Sciences 44, no. : 76-87.
The proposed treatment train removed TCE and its by-products effectively and there was no problem with the connection of chemical oxidation and anaerobic bioremediation in the novel treatment train technology.
Yen-Ping Peng; Ku-Fan Chen; Wei-Han Lin; Yu-Chen Chang; Fei Wu. A novel three-stage treatment train for the remediation of trichloroethylene-contaminated groundwater. RSC Advances 2016, 6, 41247 -41260.
AMA StyleYen-Ping Peng, Ku-Fan Chen, Wei-Han Lin, Yu-Chen Chang, Fei Wu. A novel three-stage treatment train for the remediation of trichloroethylene-contaminated groundwater. RSC Advances. 2016; 6 (47):41247-41260.
Chicago/Turabian StyleYen-Ping Peng; Ku-Fan Chen; Wei-Han Lin; Yu-Chen Chang; Fei Wu. 2016. "A novel three-stage treatment train for the remediation of trichloroethylene-contaminated groundwater." RSC Advances 6, no. 47: 41247-41260.
In this study, batch experiments were conducted using diesel‐contaminated soil collected from a former gas station to evaluate the efficiency of diesel removal by in situ chemical oxidation (ISCO) and the effects of different oxidants on the indigenous microbial community. Diesel removal efficiencies by persulfate, permanganate, and hydrogen peroxide under different concentrations (1, 3, 5, and 10%) ranged from 48 to 93% during a 120‐day reaction. The performance of diesel removal in the oxidant‐alone systems was persulfate > permanganate > hydrogen peroxide. Oxidant persistence was positively correlated with diesel removal performance. Higher diesel removal efficiencies were observed in the chemical oxidation systems with the presence of microbes. The adverse effects of the oxidants on intrinsic microbes followed the sequence persulfate > permanganate ≈ hydrogen peroxide. The addition of hydrogen peroxide and permanganate caused increased microbial diversity while more serious destruction to the microbial community was observed in the persulfate solution due to low pH (<3.5). The results suggest 1 to 3% of oxidant addition was more suitable for the application of ISCO coupled with intrinsic bioremediation. The addition of 5% oxidants could also be considered. However, pH should be controlled when persulfate is applied. © 2015 Society of Chemical Industry
Ku-Fan Chen; Yu-Chen Chang; Wan-Ting Chiou. Remediation of diesel-contaminated soil usingin situchemical oxidation (ISCO) and the effects of common oxidants on the indigenous microbial community: a comparison study. Journal of Chemical Technology & Biotechnology 2015, 91, 1877 -1888.
AMA StyleKu-Fan Chen, Yu-Chen Chang, Wan-Ting Chiou. Remediation of diesel-contaminated soil usingin situchemical oxidation (ISCO) and the effects of common oxidants on the indigenous microbial community: a comparison study. Journal of Chemical Technology & Biotechnology. 2015; 91 (6):1877-1888.
Chicago/Turabian StyleKu-Fan Chen; Yu-Chen Chang; Wan-Ting Chiou. 2015. "Remediation of diesel-contaminated soil usingin situchemical oxidation (ISCO) and the effects of common oxidants on the indigenous microbial community: a comparison study." Journal of Chemical Technology & Biotechnology 91, no. 6: 1877-1888.
Hanlin Chen; Ku-Fan Chen; Shiau-Wu Lai; Zhi Dang; Yen-Ping Peng. Photoelectrochemical oxidation of azo dye and generation of hydrogen via CN co-doped TiO2 nanotube arrays. Separation and Purification Technology 2015, 146, 143 -153.
AMA StyleHanlin Chen, Ku-Fan Chen, Shiau-Wu Lai, Zhi Dang, Yen-Ping Peng. Photoelectrochemical oxidation of azo dye and generation of hydrogen via CN co-doped TiO2 nanotube arrays. Separation and Purification Technology. 2015; 146 ():143-153.
Chicago/Turabian StyleHanlin Chen; Ku-Fan Chen; Shiau-Wu Lai; Zhi Dang; Yen-Ping Peng. 2015. "Photoelectrochemical oxidation of azo dye and generation of hydrogen via CN co-doped TiO2 nanotube arrays." Separation and Purification Technology 146, no. : 143-153.
Microwave-induced nitrogen-doped titanate nanotubes (NTNTs) were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), Zeta potential analysis, specific surface area (SBET), and UV-Visible spectroscopy. TEM results indicate that NTNTs retain a tubular structure with a crystalline multiwall and have a length of several hundred nanometers after nitrogen doping. XRD findings demonstrate that the crystalline structure of NTNTs was dominated by anatase, which is favored for photocatalytic application. The Ti-O-N linkage observed in the XPS N 1s spectrum is mainly responsible for narrowing the band gap and eventually enhancing the visible light photoactivity. FT-IR results demonstrated the existence of H₃O⁺, which could be excited by photo-generated holes to form hydroxyl radicals and degrade environmental pollutants. After sintering at 350°C, the UV-Vis absorbance edges of NTNTs significantly shift to the visible-light region, which indicates N atom doping into the nanotubes. Photocatalytic degradation of Rhodamine B (RhB) via NTNTs show good efficiency, with pseudo first-order kinetic model rate constants of 3.7 × 10⁻³, 2.4 × 10⁻³ and 8.0 × 10⁻⁴ sec⁻¹ at pH3, 7, and 11, respectively.
Caiyun Yan; Ku-Fan Chen; Chia-Hsiang Lai; Shiau-Wu Lai; Qing Chang; Yen-Ping Peng. Photocatalytic degradation of Rhodamine B by microwave-assisted hydrothermal synthesized N-doped titanate nanotubes. Journal of Environmental Sciences 2014, 26, 1505 -1512.
AMA StyleCaiyun Yan, Ku-Fan Chen, Chia-Hsiang Lai, Shiau-Wu Lai, Qing Chang, Yen-Ping Peng. Photocatalytic degradation of Rhodamine B by microwave-assisted hydrothermal synthesized N-doped titanate nanotubes. Journal of Environmental Sciences. 2014; 26 (7):1505-1512.
Chicago/Turabian StyleCaiyun Yan; Ku-Fan Chen; Chia-Hsiang Lai; Shiau-Wu Lai; Qing Chang; Yen-Ping Peng. 2014. "Photocatalytic degradation of Rhodamine B by microwave-assisted hydrothermal synthesized N-doped titanate nanotubes." Journal of Environmental Sciences 26, no. 7: 1505-1512.
In this study, the biodegradability of nanoscale zero-valent iron (nZVI) dispersants and their effects on the intrinsic biodegradation of trichloroethylene (TCE) were evaluated. Results of a microcosm study show that the biodegradability of three dispersants followed the sequence of: polyvinyl alcohol-co-vinyl acetate-co-itaconic acid (PV3A) > polyoxyethylene (20) sorbitan monolaurate (Tween 20) > polyacrylic acid (PAA) under aerobic conditions, and PV3A > Tween 20 > PAA under anaerobic conditions. Natural biodegradation of TCE was observed under both aerobic and anaerobic conditions. No significant effects were observed on the intrinsic biodegradation of TCE under aerobic conditions with the presence of the dispersants. The addition of PAA seemed to have a slightly adverse impact on anaerobic TCE biodegradation. Higher accumulation of the byproducts of anaerobic TCE biodegradation was detected with the addition of PV3A and Tween 20. The diversity of the microbial community was enhanced under aerobic conditions with the presence of more biodegradable PV3A and Tween 20. The results of this study indicate that it is necessary to select an appropriate dispersant for nZVI to prevent a residual of the dispersant in the subsurface. Additionally, the effects of the dispersant on TCE biodegradation and the accumulation of TCE biodegrading byproducts should also be considered.
Y. C. Chang; S. C. Huang; K. F. Chen. Evaluation of the effects of nanoscale zero-valent iron (nZVI) dispersants on intrinsic biodegradation of trichloroethylene (TCE). Water Science and Technology 2014, 69, 2357 -2363.
AMA StyleY. C. Chang, S. C. Huang, K. F. Chen. Evaluation of the effects of nanoscale zero-valent iron (nZVI) dispersants on intrinsic biodegradation of trichloroethylene (TCE). Water Science and Technology. 2014; 69 (11):2357-2363.
Chicago/Turabian StyleY. C. Chang; S. C. Huang; K. F. Chen. 2014. "Evaluation of the effects of nanoscale zero-valent iron (nZVI) dispersants on intrinsic biodegradation of trichloroethylene (TCE)." Water Science and Technology 69, no. 11: 2357-2363.