ZnFe-LDH/GO nanocomposite coated on the glass support as a highly efficient catalyst for visible light photodegradation of an emerging pollutant
ZnFe-LDH/GO nanocomposite coated on the glass support as a highly efficient catalyst for visible light photodegradation of an emerging pollutant
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DOI：
10.1016/j.molliq.2020.112532
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发表时间：
2020-03-15
影响因子：
6
通讯作者：
Rad, Tannaz Sadeghi
中科院分区：
文献类型：
--
作者：
Motlagh, Parisa Yekan;Khataee, Alireza;Rad, Tannaz Sadeghi
采用化学共沉淀法制备了氧化石墨烯（GO）修饰的ZnFe-SO_4-LDH（硫酸根插层水滑石）。然后将它们涂覆在玻璃基底上（表示为ZnFe-LDH/GO/GS）。采用XRD、SEM、EDX、X射线斑点图、FTIR、AFM、UV-Vis DRS和PL等分析手段对合成样品进行了表征。以盐酸非那吡啶（PhP）溶液为研究对象，考察了该光催化剂在可见光照射下的光催化降解性能。结果表明，制备的光催化剂具有光催化去除PhP的性能，在初始PhP浓度为15 mg/L、pH值为8（自然pH）、3片光催化剂的条件下，150 min内污染物的降解率可达60.01%。当过硫酸钾（K2 S2 O 8）浓度为1 mmol/L时，150 min的光催化降解率可达93.95%。捕集实验表明，O-2（-中心点）>中心点OH > h（+）对分解过程中存在的ROS的影响顺序为O-2（-中心点）>中心点OH > h（+）。采用GC-MS技术对光催化降解过程中生成的五种中间产物进行了分析。在300分钟的光催化反应后实现60%的COD去除效率，证实PhP溶液的矿化。最后，ZnFe-LDH/GO/GS光催化剂在PhP降解中的可重复使用性测试显示，在连续五个循环后发生几乎12%的下降。(C)2020爱思唯尔B. V.保留所有权利。
This study reports the fabrication of ZnFe-layered double hydroxides with sulfate-intercalated anion (ZnFe-SO4-LDH) modified with graphene oxide (GO) by chemical co-precipitation method. They were then coated on the glass substrates (denoted as ZnFe-LDH/GO/GS). The XRD, SEM, EDX, X-ray Dot-mapping, FTIR, AFM, UV-Vis DRS, and PL analyses were used for the characterization of the as-synthesized sample. The photocatalytic implementation of the as-prepared photocatalyst was scrutinized for the degradation of phenazopyridine hydrochloride (PhP) from the solution under visible light irradiation. The prepared photocatalyst showed photocatalytic performance of elimination PhP, the degraded rate of pollutant could reach 60.01% in 150 min of photocatalysis process under the optimum conditions: initial PhP concentration of 15 mg/L, pH of 8 (natural pH), and 3 photocatalysts plates. The addition of 1 mmol/L of potassium persulfate (k(2)S(2)O(8)) caused the degradation efficiency of 93.95% within the 150 min of photocatalytic process. Trapping experiments indicated the influence order of O-2(-center dot) > center dot OH > h(+) for the ROSs present in decomposition. The transformation of five intermediates of PhP produced in the photocatalytic degradation process was identified by the GC-MS technique. 60% COD removal efficiency was achieved after 300 min of photocatalytic reaction confirming mineralization of the PhP solution. Finally, a reusability test of ZnFe-LDH/GO/GS photocatalyst in the PhP degradation revealed that almost 12% drop occurred after five successive cycles. (C) 2020 Elsevier B.V. All rights reserved.