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Pb2+ adsorption on TiO2 @HF-waste building bricks: Kinetics, thermodynamics, and mechanisms
Jing Shi1, Chao Xing1, Yating Chen2
1School of Engineering, China Pharmaceutical University, Nanjing, China.
Abstract:
Pb2+ pollution poses severe threats to human health and ecosystem. In this study, based on the waste building bricks (WBB), the TiO2 @HF-WBB was prepared for Pb2+ adsorption removal from wastewater. The adsorption of Pb2+ on TiO2 @HF-WBB followed the pseudo-second-order kinetics and the Freundlich isotherm model. The thermodynamic parameters indicated that the adsorption process was endothermic, spontaneous, and irreversible, and also included physical adsorption and chemical adsorption simultaneously. Ca2+ and Mg2+ had little effect on Pb2+ adsorption. The effluent of fixed-bed was below 3 μg/L within 1,000 BV. The desorption rate could reach 90% by simple operation. The possible mechanisms included the electrostatic interaction and the complexation. PRACTITIONER POINTS: Waste building bricks were utilized for Pb2+ removal from wastewater. The effluent of fixed-bed was below 3 μg/L within 1,000 BV. TiO2 @HF-WBB has excellent adsorption property and desorption property. Possible mechanisms are electrostatic interaction and the complexation.
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