Pb2+ adsorption on TiO2@HF-waste building bricks: Kinetics, thermodynamics, and mechanisms

被引：2
|
作者：
Shi, Jing [1 ]
Xing, Chao [1 ]
Chen, Yating [2 ]
Xu, Zhengwen [2 ]
Du, Qiong [1 ]
Cui, Yixin [1 ]
机构：
[1] China Pharmaceut Univ, Sch Engn, Nanjing, Jiangsu, Peoples R China
[2] Nanjing Univ Informat Sci & Technol, Sch Environm Sci & Engn, Nanjing, Jiangsu, Peoples R China
来源：
WATER ENVIRONMENT RESEARCH | 2019年 / 91卷 / 08期
基金：
中国国家自然科学基金;
关键词：
adsorption; Pb2+; TiO2; waste building bricks; HEAVY-METAL IONS; AQUEOUS-SOLUTIONS; ACTIVATED CARBON; POLYTHIOPHENE/TIO2; COMPOSITE; OPTICAL-PROPERTIES; PB(II) ADSORPTION; ENHANCED PB(II); LEAD(II) IONS; WASTE-WATER; REMOVAL;
D O I：
10.1002/wer.1109
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
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 mu g/L within 1,000 BV. The desorption rate could reach 90% by simple operation. The possible mechanisms included the electrostatic interaction and the complexation. (C) 2019 Water Environment Federation
引用
收藏
页码：788 / 796
页数：9
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