Novel approach to control adsorbent aggregation： iron fixed bentonite-fly ash for Lead （Pb） and Cadmium （Cd） removal from aqueous media

作     者：Teza Mwamulima Xiaolin Zhang Yongmei Wang Shaoxian Song Changsheng Peng 

作者机构：The Key Laboratory of Marine Environmental Science and Ecology Ministry of Education Ocean University of China Qingdao 266100 China School of Resource and Environmental Engineering Wuhan University of Technology Wuhan 430070 China 

出 版 物：《Frontiers of Environmental Science & Engineering》 (环境科学与工程前沿（英文）)

年 卷 期：2018年第12卷第2期

页      面：17-28页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0703[理学-化学] 081102[工学-检测技术与自动化装置] 0811[工学-控制科学与工程] 

基　　金：This work was supported by the State Key Laboratory of Environmental Criteria and Risk Assessment 国家教育部高等学校科技创新工程重大项目培育资金 

主　　题：Zero valent ironBentoniteFly ashHeavy metals removalSynthesis 

摘      要：In the present study, a novel approach was used to control zero valent iron aggregation and separation problems by fixing zero valent iron （ZVI） on bentonite-fly ash pellets. For this purpose, porous low cost bentonite-fly ash （BFA） pellets with size of 2.00 cm in length and 0.35 cm in diameter were prepared and fixed with ZV1 to manufacture zero valent iron bentonite-fly ash （ZVI-BFA） pellets. Importantly, unlike powdered adsorbents, ZVI-BFA can easily be separated from final effluents when exhausted without any disintegration. The performance of the developed novel adsorbent was investigated for the removal of Pb2＋ and Cd2＋ from aqueous media. At 100 mg.L I and 1 g adsorbent, a maximum of 89.5% ofCd2＋ and 95.6% ofPb2＋ was removed by ZVI-BFA as compared to 56% and 95% removal by BFA. At 200 mg.L 10 Cd2＋ and Pb2＋ removal by ZVI-BFA was 56% and 99.8% respectively as compared to only 28% and 96% by BFA. Further, the removal kinetics was best fitted for pseudo-second order model. The study provides the basis for improving the removal capacity of porous materials by iron fixation while taking separation ability into consideration.