Efficient Removal of Cr(VI) by TiO(2) Based Micro-Nano Reactor via the Synergy of Adsorption and Photocatalysis.
Efficient Removal of Cr(VI) by TiO(2) Based Micro-Nano Reactor via the Synergy of Adsorption and Photocatalysis.
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DOI：
10.3390/nano12020291
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发表时间：
2022-01-17
期刊：
影响因子：
--
通讯作者：
Ma H
中科院分区：
文献类型：
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作者：
Song Y;Lu X;Liu Z;Liu W;Gai L;Gao X;Ma H
含铬废水的低毒性处理是解决环境问题的重要途径。采用一步水热法合成了核壳结构的ZIF-8@TiO2光催化剂。所得复合光催化剂的光催化活性较TiO 2有所提高。结果表明，优化后的ZIF-8@TiO2复合材料在紫外-可见光照射下120 min对Cr（VI）的去除率最高，达到93.1%。去除曲线和XPS结果表明，吸附在ZIF-8上的Cr（VI）在黑暗过程中优先还原。ZIF-8@TiO 2的上级去除效率归因于ZIF-8在复合材料表面上的高吸附（其吸引Cr（VI））和光诱导电子-空穴对的高分离效率两者的组合。对于含甲基橙橙子和Cr（VI）的混合废水，光照5 min和60 min后，MO和Cr（VI）的去除率分别为97.1%和99.7%。该技术对多种污染物的高效去除为Cr（VI）污染的工业废水处理提供了广阔的应用前景。
The low-toxicity treatment of chromium-containing wastewater represents an important way of addressing key environmental problems. In this study, a core-shell structural ZIF-8@TiO2 photocatalyst was synthesized by a simple one-step hydrothermal method. The obtained composite photocatalyst possessed improved photocatalytic activity compared with TiO2. The results indicated that the optimized ZIF-8@TiO2 composite exhibited the highest removal efficiency with 93.1% of Cr(VI) after 120 min under UV-vis irradiation. The removal curves and XPS results indicated that the adsorbed Cr(VI) on the ZIF-8 during the dark process was preferentially reduced. The superior removal efficiency of ZIF-8@TiO2 is attributed to the combination of both high adsorption of ZIF-8, which attracted Cr(VI) on the composite surface, and the high separation efficiency of photo-induced electron-hole pairs. For the mixture of wastewater that contained methyl orange and Cr(VI), 97.1% of MO and 99.7% of Cr(VI) were removed after 5 min and 60 min light irradiation, respectively. The high removal efficiency of multiple pollutants provides promising applications in the field of Cr(VI) contaminated industrial wastewater treatment.