Photocatalytic degradation of organic wastes by electrochemically assisted TiO2 photocatalytic system
Photocatalytic degradation of organic wastes by electrochemically assisted TiO2 photocatalytic system
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DOI：
10.1016/j.jenvman.2003.09.019
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发表时间：
2004-01-01
影响因子：
8.7
通讯作者：
Jin, LT
中科院分区：
文献类型：
--
作者：
Chen, JS;Liu, MC;Jin, LT
纳米二氧化钛颗粒光催化降解有机废物的研究已经进行了很长时间，以期为废水处理提供合适的方法，但由于过程缓慢，其实际应用受到很大限制。在这项工作中，通过将TiO2光催化电池与三电极恒电位单元结合，建立了电化学辅助TiO2光催化体系。复合体系对有机废物矿化表现出较高的光催化活性。连续处理0.5 h后，罗丹明6G （R-6G）的最大吸收率降低90%以上；印染废水（TDW）的化学需氧量（COD）和生化需氧量（BOD5）分别降低了93.9%和88.7%。COD/BOD5比值由2.1降至1.2，提高了TDW的生物降解性。上述结果表明，该复合体系可用于有机废物的有效矿化或作为生物后处理的脱毒脱色预处理阶段。(C) 2003 Elsevier Ltd.版权所有。
Photocatalytic degradation of organic wastes with nanosized titanium dioxide particles has been studied for a long time in order to offer an appropriate method for wastewater treatment, but its practical application is greatly limited by the slow process. In this work, an electrochemically assisted TiO2 photocatalytic system was set-up by combining a TiO2 photocatalytic cell with a three-electrode potentiostatic unit. The composite system revealed high photocatalytic activity towards organic wastes mineralization. After continuous treatment for 0.5 h, the maximum absorption of rhodamine 6G (R-6G) was reduced by more than 90%; chemical oxygen demand (COD) and biochemical oxygen demand (BOD5) of textile dye wastewater (TDW) were decreased by 93.9 and 88.7%, respectively. The biodegradability of TDW was also improved because the COD/BOD5 ratio decreased from 2.1 to 1.2. All these results indicated that the composite system could be used for effective organic wastes mineralization or as a feasible detoxification and color removal pretreatment stage for biological post treatment. (C) 2003 Elsevier Ltd. All rights reserved.