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A rapid, cost-effective and accurate detection of heavy metal ions is crucial for human health monitoring and environmental protection. Surface-enhanced Raman spectroscopy (SERS) has become a reliable method due to its outstanding performance for the identification of contaminants. In this paper, silver phosphate microcubes (Ag3PO4) were fabricated using two different precipitation methods for ultrasensitive SERS detection of heavy metal ions. The use of an organic linker (BPy) with Ag3PO4 enabled the immobilization of Hg2+ and Pb2+ ions. The formation of Ag3PO4 was confirmed by XRD, UV-DRS, FESEM coupled with EDX and HRTEM. The analytical enhancement factor (AEF) obtained was 1010 with a detection limit of 10-15 M indicating high sensitivity. Based on these results, the possible SERS mechanism has been proposed and discussed. Moreover, an excellent reusability of Ag3PO4 substrate for at least four cycles was achieved upon the light exposure on heavy metal loaded substrate due to its superior catalytic ability for the degradation of heavy metal ions. The as-prepared substrate demonstrated remarkable stability, selectivity and SERS sensitivity towards real samples. The results conclude that Ag3PO4 microcubes offer a great prospect in recyclable SERS applications.
Surabhi Kamal; Thomas Chung-Kuang Yang. Silver enriched silver phosphate microcubes as an efficient recyclable SERS substrate for the detection of heavy metal ions. Journal of Colloid and Interface Science 2021, 605, 173 -181.
AMA StyleSurabhi Kamal, Thomas Chung-Kuang Yang. Silver enriched silver phosphate microcubes as an efficient recyclable SERS substrate for the detection of heavy metal ions. Journal of Colloid and Interface Science. 2021; 605 ():173-181.
Chicago/Turabian StyleSurabhi Kamal; Thomas Chung-Kuang Yang. 2021. "Silver enriched silver phosphate microcubes as an efficient recyclable SERS substrate for the detection of heavy metal ions." Journal of Colloid and Interface Science 605, no. : 173-181.
Surface-enhanced Raman spectroscopy (SERS) is a non-destructive and ultrasensitive detection tool used for a variety of contaminants in recent years. In this paper, we synthesized a multifunctional Ag2CO3 nanocomposite for a sensitive SERS detection and photodegradation of Rhodamine B (RhB) dye. The proposed Ag2CO3 substrate was characterized using XRD, UV–vis, FESEM, EDX and TEM techniques. Ag2CO3 exhibited a strong SERS sensitivity with a detection limit of 10−11 M and good reproducibility for the detection of RhB molecules. The degradation efficiency of Ag2CO3 under visible light irradiation was found to be 95%. The SERS and photocatalysis mechanisms were proposed considering the charge-transfer paths between the substrate and RhB molecules. Additionally, an excellent reusability property of Ag2CO3 microcrystals was observed for SERS detection due to its catalytic activity. This work explores the potential usability of Ag2CO3 substrate as a promising candidate for detection and photodegradation applications.
Shital Paulu Godad; Surabhi Kamal. Multifunctional Ag2CO3 microrods as SERS-active substrate for the detection and degradation of Rhodamine B dye. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2021, 263, 120176 .
AMA StyleShital Paulu Godad, Surabhi Kamal. Multifunctional Ag2CO3 microrods as SERS-active substrate for the detection and degradation of Rhodamine B dye. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 2021; 263 ():120176.
Chicago/Turabian StyleShital Paulu Godad; Surabhi Kamal. 2021. "Multifunctional Ag2CO3 microrods as SERS-active substrate for the detection and degradation of Rhodamine B dye." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 263, no. : 120176.
The sulfur-doped carbon nitride/cobalt ferrite nanocomposite (SCN/CoFe2O4) was prepared via ultrasonication and studied for the sonocatalytic degradation of wastewater organic dye pollutants including methylene blue, rhodamine B, and Congo red. The X-ray photoelectron spectroscopy confirmed the presence and atomic ratios of S, C, N, Co, Fe, and O elements and their corresponding bonds with Co2+ and Fe3+ cations. The nanocomposite was found to have aggregated nanoparticles on a sheet-like structure. The bandgap energy was estimated to be 1.85 eV. For the sonocatalytic degradation of 25-ppm methylene blue at 20 kHz, 1 W and 50% amplitude, the best operating condition was determined to be 1 g/L of catalyst dosage and 4 vol % of hydrogen peroxide loading. Under this condition, the sonocatalytic removal efficiency was the highest at 96% within a reaction period of 20 min. SCN/CoFe2O4 outperformed SCN and CoFe2O4 by 2.2 and 6.8 times, respectively. The SCN/CoFe2O4 nanocomposite was also found to have good reusability with a drop of only 7% after the fifth cycle. However, the degradation efficiencies were low when tested with rhodamine B and Congo red due to difference in dye sizes, structural compositions, and electric charges.
Surabhi Kamal; Guan-Ting Pan; SiewHui Chong; Thomas Chung-Kuang Yang. Ultrasonically Induced Sulfur-Doped Carbon Nitride/Cobalt Ferrite Nanocomposite for Efficient Sonocatalytic Removal of Organic Dyes. Processes 2020, 8, 104 .
AMA StyleSurabhi Kamal, Guan-Ting Pan, SiewHui Chong, Thomas Chung-Kuang Yang. Ultrasonically Induced Sulfur-Doped Carbon Nitride/Cobalt Ferrite Nanocomposite for Efficient Sonocatalytic Removal of Organic Dyes. Processes. 2020; 8 (1):104.
Chicago/Turabian StyleSurabhi Kamal; Guan-Ting Pan; SiewHui Chong; Thomas Chung-Kuang Yang. 2020. "Ultrasonically Induced Sulfur-Doped Carbon Nitride/Cobalt Ferrite Nanocomposite for Efficient Sonocatalytic Removal of Organic Dyes." Processes 8, no. 1: 104.