Innovative photocatalytic reactor for the degradation of chlorpyrifos using a coated composite of ZrV2O7 and graphene nano-platelets
Innovative photocatalytic reactor for the degradation of chlorpyrifos using a coated composite of ZrV2O7 and graphene nano-platelets
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DOI：
10.1016/j.cej.2020.124974
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发表时间：
2020-09-01
影响因子：
15.1
通讯作者：
ElKady, Marwa
中科院分区：
文献类型：
--
作者：
Samy, Mahmoud;Ibrahim, Mona G.;ElKady, Marwa
采用一种新颖的光催化反应器对低禁带石墨烯纳米片(GNPs)和钒酸锆(ZrV2O7)复合材料的性能进行了研究。将该复合材料涂覆在反应器内的照明板上，以评价其光催化活性和稳定性。利用透射电子显微镜、能谱分析、扫描电子显微镜、拉曼光谱、X射线衍射仪、热重分析法、荧光光电子能谱和X射线光电子能谱等分析手段对复合材料的形貌和结构进行了研究。以毒死蜱为模型污染物，考察了实验装置的性能。通过响应面法(RSM)对操作参数进行优化，采用了中心复合设计(CCD)。GNPs/ZrV2O7连续5次的降解率分别为96.8%、95.2%、93.8%、92.8%和91.0%，而裸ZrV2O7的降解率分别为85.4%、84.6%、83.8%、82.6%和81.8%。利用质谱仪和氧化剂清除实验对毒死蜱的降解机理和途径进行了研究。
An innovative photocatalytic reactor was employed to assess the performance of a low band-gap synthesized composite of graphene nano-platelets (GNPs) and zirconium vanadate (ZrV2O7). The composite was coated on illuminated plates inside the reactor to evaluate its photocatalytic activity and stability. Various analyses such as TEM, EDX, SEM, Raman spectroscopy, XRD, TGA, PL, and XPS were employed to study the morphology and structure of the composite. Chlorpyrifos was used as a model pollutant to examine the performance of the experimental set-up. A central composite design (CCD) was used for the optimization of the operating parameters through the response surface methodology (RSM). The degradation efficiencies using GNPs/ZrV2O7 were 96.8%, 95.2%, 93.8%, 92.8% and 91.0%, compared to 85.4%, 84.6%, 83.8%, 82.6% and 81.8% in the case of bare ZrV2O7 in five consecutive runs. The mechanism and pathway of chlorpyrifos degradation were investigated based on mass spectrometry and the scavenging assay of oxidant species.