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首页> 外文期刊>Journal of Hazardous Materials >Photocatalytic Degradation Of Rhodamine B By Bi_2wo_6 With Electron Accepting Agent Under Microwave Irradiation: Mechanism And Pathway
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Photocatalytic Degradation Of Rhodamine B By Bi_2wo_6 With Electron Accepting Agent Under Microwave Irradiation: Mechanism And Pathway

机译:电子接受剂Bi_2wo_6对Bi_2wo_6光催化降解罗丹明B的作用机理及途径

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Bi_2 WO_6 was successfully synthesized by a facile hydrothermal method, and characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and BET. As a result, Bi_2WO_6 crystals displayed mainly square-plate-like morphologies with a short edge and the average crystalline size was in the range of 50-150 ran. Then microwave-assisted photocatalytic degradation of rhodamine B (RhB) using Bi_2WO_6 was investigated. The results illustrated that RhB (10 mg/L) was bleached effectively and the removal efficiency was about 94% in 60min. Effect of electron accepting agent (air, H_2O_2) on the degradation efficiency of RhB was also examined. Degradation intermediates of RhB in the presence of H_2O_2 were identified by LC/MS/MS and GC/MS. All five N-de-ethylated intermediates were monitored by LC/MS/MS easily, and seven organic acids such as succinic acid, benzoic acid, adipic acid, 3-hydroxybenzoic acid, phthalic acid, etc., were also detected by GC/MS. The possible degradation mechanism of RhB in the presence of H_2O_2 included four processes: N-de-ethylation, chromophore cleavage, opening-ring and mineralization, which coexisted in microwave-assisted photocatalytic system.
机译:通过简便的水热法成功合成了Bi_2 WO_6,并通过透射电子显微镜(TEM),X射线衍射(XRD)和BET对其进行了表征。结果,Bi_2WO_6晶体主要显示出具有短边缘的正方形板状形态,并且平均晶体尺寸在50-150nm的范围内。然后研究了Bi_2WO_6微波辅助光催化降解若丹明B(RhB)的过程。结果表明,RhB(10 mg / L)被有效漂白,在60分钟内的去除率约为94%。还研究了电子接受剂(空气,H_2O_2)对RhB降解效率的影响。通过LC / MS / MS和GC / MS鉴定在H_2O_2存在下RhB的降解中间体。通过LC / MS / MS可以轻松监测所有5种N-去乙基化中间体,还可以通过GC / MS检测7种有机酸,如琥珀酸,苯甲酸,己二酸,3-羟基苯甲酸,邻苯二甲酸等。多发性硬化症。在H_2O_2存在下,RhB可能的降解机理包括四个过程:N-去乙基化,发色团裂解,开环和矿化,这四个过程共存于微波辅助光催化体系中。

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