Sol-gel synthesis of new ZnFe2O4/Na-bentonite composites for simultaneous oxidation of RhB and reduction of Cr(VI) under visible light irradiation
Sol-gel synthesis of new ZnFe2O4/Na-bentonite composites for simultaneous oxidation of RhB and reduction of Cr(VI) under visible light irradiation
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溶胶-凝胶合成新型 ZnFe2O4/Na-膨润土复合材料在可见光照射下同时氧化 RhB 和还原 Cr(VI)
DOI：
10.1016/j.jallcom.2018.12.050
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发表时间：
2019-04-15
影响因子：
6.2
通讯作者：
Wang, Guanghui
中科院分区：
文献类型：
--
作者：
Guo, Yiqin;Guo, Yadan;Wang, Guanghui
为了提高ZnFe 2 O 4的光生载流子分离能力和稳定性，以钠基膨润土为载体，采用溶胶-凝胶法制备了ZnFe 2 O 4/钠基膨润土复合材料。采用XRD、TEM、XPS、FTIR和UV-vis DRS等测试手段对样品的组成、表面形貌和光学性能进行了表征。TEM和XPS结果表明，ZnFe 2 O 4纳米粒子通过插层作用分散在钠基膨润土薄层上。ZnFe_2O_4/Na-膨润土复合材料对Cr（VI）-RhB废水的协同处理效果表明，复合材料在120 min内对Cr（VI）和RhB的去除率分别为88.6%和94.2%，是单独处理的1.3倍。基于PL和活性物种参与RhB和Cr（VI）去除的实验结果，新的ZnFe 2 O 4/Na-膨润土复合材料的增强的光催化活性可能是由于可见光吸附能力，更大的界面面积，以及有效的转移和延长的电荷-空穴分离。(C)2018爱思唯尔B. V.保留所有权利。
To improve the photogenerated charge carrier separation and stability of ZnFe2O4, we prepared new ZnFe2O4/Na-bentonite composites using Na-bentonite as the carrier via a sol-gel method. The composition, surface morphology and optical properties of samples were characterized by XRD, TEM, XPS, FTIR and UV-vis DRS analysis. The results of TEM and XPS show that the ZnFe2O4 nanoparticles spread on the thin layers of Na-bentonite due to intercalation with Na-bentonite. The simultaneous effect of the Cr(VI)-RhB wastewater system was investigated by ZnFe2O4/Na-bentonite composites, the removal rate are 88.6% for Cr(VI) and 94.2% for RhB in 120 min, which is 1.3-fold higher of Cr(VI) reduction than that of the individual ones. Based on experimental results of PL and reactive species involved in the removal of RhB and Cr(VI), the enhanced photocatalytic activity of the new ZnFe2O4/Na-bentonite composite could be due to visible-light adsorption ability, larger interfacial area, as well as effective transfer and prolonged charge-hole separation. (C) 2018 Elsevier B.V. All rights reserved.