Biotemplated Synthesis of Hierarchically Porous ZnAl-CLDH/FeWO4 for Effective Removal of Dyes From Water

被引:0
作者
Yong Liu
Gui Wang
Wenning Yang
Jie Yang
Jia Li
机构
[1] University of Jinan,School of Material Science and Engineering
来源
Water, Air, & Soil Pollution | 2019年 / 230卷
关键词
ZnAl-CLDH; Adsorption; Photocatalysis; Heterojunction; FeWO;
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学科分类号
摘要
Biotemplating method is a promising way to obtain hierarchical materials with unique morphology and property. In the current work, a novel hierarchically porous ZnAl-CLDH (calcined layered double hydroxides)/FeWO4 had been successfully synthesized by a facile biotemplated method. The obtained samples were characterized in detail via FESEM-EDX, TEM, XRD, IR, TGA, and BET techniques. The as-synthesized ZnAl-CLDH/FeWO4 hierarchical microspheres were composed of ZnAl-CLDH nanosheets and FeWO4 nanoparticles. The obtained sample exhibited both high adsorption and visible-light photocatalytic activity toward Congo Red (CR) in water. It was found that the adsorption process was well described by the pseudo-second-order kinetic model and the Langmuir isotherm model, while the photocatalytic degradation process was well fitted to the first-order kinetics model. The enhanced photocatalytic performance was mainly due to the hierarchically porous structure that could offer more exposed active sites, as well as the unique energy band structure of heterostructures, that facilitated the efficient separation and transfer of photoinduced carriers and enhanced light harvesting. In addition, the as-prepared sample had quickly magnetic response and could be easily separated from water under an external magnetic field after wastewater treatment.
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