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首页> 外文期刊>Desalination and water treatment >Photocatalytic reduction of Cr (Ⅵ) in aqueous solution over ZnO/ HZSM-5 nanocomposite: optimization of ZnO loading and process conditions
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Photocatalytic reduction of Cr (Ⅵ) in aqueous solution over ZnO/ HZSM-5 nanocomposite: optimization of ZnO loading and process conditions

机译：ZnO / HZSM-5纳米复合材料光催化还原水溶液中的Cr（Ⅵ）：优化ZnO负载量和工艺条件

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The photo-reduction of Cr (VI) was investigated over a series of ZnO-impregnated H-ZSM-5 catalysts varying in ZnO loadings. All the samples were characterized by XRD, FESEM, TEM, EDX, BET, ICP and FT-IR techniques. The XRD analysis confirmed the existence of ZnO and HZSM-5 as crystalline phases in the nanocomposite structure. TEM images illustrated that fine nanoparticles of active metal oxide that were uniformly dispersed over HZSM-5 support. In addition, activity tests were carried out and effects of operational parameters such as initial concentration, reaction time, UV intensity and pH were evaluated. Among the prepared samples, the ZnO/H-ZSM-5 nanocomposite containing 40 wt% ZnO demonstrated the best photocatalytic activity. The full factorial design was applied to optimize the effect of variable factors in the presence of the best photocatalyst. The ANOVA results indicated that at the 95% confidence level, all four variables and their interactions significantly affected the Cr (VI) reduction. In addition, the most effective variable was the initial concentration of Cr (VI). The optimum initial concentration of Cr (VI), pH, UV intensity and reaction time were found to be 10 mg/L, 3, 125 W and 60 min, respectively. Under optimal conditions, complete reduction (>98%) was approximately obtained for Cr (VI).
机译：在一系列ZnO浸渍量不同的ZnO浸渍的H-ZSM-5催化剂上研究了Cr（VI）的光还原。通过XRD，FESEM，TEM，EDX，BET，ICP和FT-IR技术对所有样品进行表征。 XRD分析证实纳米复合结构中存在ZnO和HZSM-5作为结晶相。 TEM图像表明，活性金属氧化物的细小纳米颗粒均匀地分散在HZSM-5载体上。此外，还进行了活性测试，并评估了操作参数（如初始浓度，反应时间，紫外线强度和pH）的影响。在制备的样品中，含有40％（重量）ZnO的ZnO / H-ZSM-5纳米复合材料表现出最好的光催化活性。在最佳光催化剂的存在下，采用全因子设计来优化可变因子的效果。方差分析结果表明，在95％置信水平下，所有四个变量及其相互作用都显着影响Cr（VI）的降低。此外，最有效的变量是Cr（VI）的初始浓度。 Cr（VI），pH，UV强度和反应时间的最佳初始浓度分别为10 mg / L，3、125 W和60分钟。在最佳条件下，Cr（VI）大约可以完全还原（> 98％）。

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