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The heavy metal Cd(II) in wastewater is highly toxic to organisms and must be removed. In this work, an efficient Cd(II) adsorbent consisting of ground calcium carbonate (GCC) and nano-TiO2 (GCC/TiO2) was harvested through a facile two-step strategy. Firstly, GCC was immersed in titanium sol which prepared from titanium butoxide to form the precursor. Secondly, GCC/TiO2 was obtained via hydrothermal reaction and the optimal hydrothermal condition was determined to be pH of 3, temperature of 200 °C and reaction time of 12 h. The removal of Cd(II) from aqueous solution by adsorbents under different hydrothermal conditions and adsorption experiments was studied by means of SEM, FT-IR, XPS, and ICP. The maximum Cd(II) removal capacity was approximately 124.07 mg/g at 25 °C and the adsorption equilibrium was attained in only 8 min (at 100 mg/g initial Cd(II) concentration, 0.8 g/L adsorbent dosage, and an initial Cd(II) solution pH of 5). Furthermore, the Cd(II) removal capacity of GCC/TiO2 was significantly higher than that of isolated GCC and TiO2 and exhibited an excellent self-settlement property, which is beneficial for adsorbent separation in practical applications. The Cd(II) removal mechanisms include ion-exchange reaction between Cd(II) and the Ca2+ ions on the GCC/TiO2 surface and electrostatic attraction. Moreover, the GCC/TiO2 adsorbent could be regenerated by ethylenediaminetetraacetic acid disodium salt and exhibited a high reusability. The adsorption data could be well fitted by the Langmuir model, and the adsorption kinetic follows the pseudo-second-order model indicating that the removal processes are controlled by the chemisorption mechanism.
Shanguang Wang; Dali Zhou; Jiabei Zhou; Can Liu; Xiao Xiao; Chengsheng Song. Cd(II) Removal by Novel Fabricated Ground Calcium Carbonate/Nano-TiO2 (GCC/TiO2) Composite from Aqueous Solution. Water, Air, & Soil Pollution 2019, 230, 147 .
AMA StyleShanguang Wang, Dali Zhou, Jiabei Zhou, Can Liu, Xiao Xiao, Chengsheng Song. Cd(II) Removal by Novel Fabricated Ground Calcium Carbonate/Nano-TiO2 (GCC/TiO2) Composite from Aqueous Solution. Water, Air, & Soil Pollution. 2019; 230 (7):147.
Chicago/Turabian StyleShanguang Wang; Dali Zhou; Jiabei Zhou; Can Liu; Xiao Xiao; Chengsheng Song. 2019. "Cd(II) Removal by Novel Fabricated Ground Calcium Carbonate/Nano-TiO2 (GCC/TiO2) Composite from Aqueous Solution." Water, Air, & Soil Pollution 230, no. 7: 147.
Sodium silicate water glass was modified with sodium polyacrylate as the binder, the composite slurry used for high-temperature oxidation-resistant coating was prepared by mixing glass powder with good lubrication properties in the binder. The properties of the modified binder and high-temperature oxidation resistance of Ti-6Al-4V titanium alloy coated with composite glass coating were studied by XRD, SEM, EDS, TG-DSC and so on. Results showed that sodium polyacrylate modified water glass could obviously improve the suspension stability of the binder, the pyrolytic carbon in the binder at high temperature could increase the surface tension in the molten glass system, and the composite glass coating could be smooth and dense after heating. Pyrolytic carbon diffused and combined with oxygen in the coating under the heating process to protect the titanium alloy from oxidation. The thickness of the oxide layer was reduced 51% after applying the high-temperature oxidation-resistant coating. The coating also showed a nearly 30% reduction in friction coefficient due to the boundary lubricant regime. During cooling, the coating could be peeled off easily because of the mismatched CTE between the coating and substrate.
Shuang Yang; Dali Zhou; Jiabei Zhou; Lei Yang; Qing Fan; Qianqian Yao; Yongqiang Yang. Study on Modified Water Glass Used in High Temperature Protective Glass Coating for Ti-6Al-4V Titanium Alloy. Coatings 2018, 8, 158 .
AMA StyleShuang Yang, Dali Zhou, Jiabei Zhou, Lei Yang, Qing Fan, Qianqian Yao, Yongqiang Yang. Study on Modified Water Glass Used in High Temperature Protective Glass Coating for Ti-6Al-4V Titanium Alloy. Coatings. 2018; 8 (5):158.
Chicago/Turabian StyleShuang Yang; Dali Zhou; Jiabei Zhou; Lei Yang; Qing Fan; Qianqian Yao; Yongqiang Yang. 2018. "Study on Modified Water Glass Used in High Temperature Protective Glass Coating for Ti-6Al-4V Titanium Alloy." Coatings 8, no. 5: 158.