新型杂多酸盐光催化降解亚甲基蓝染料废水

doi:10.11944/j.issn.1000-0518.2016.05.150296

摘要/Abstract

摘要：

以水热自组装法合成的新型杂多酸盐[PMo₈V₆O₄₂][Co(Phen)₂][Him]₂·2H₃O·3H₂O(1),通过红外光谱、拉曼光谱、紫外-可见光谱、光电子能谱和X粉末衍射等技术手段进行表征。以此物质为催化剂光催化降解亚甲基蓝染料废水。分别讨论催化剂投加量、亚甲基蓝废水初始浓度、废水溶液酸度(pH)对亚甲基蓝降解率的影响。实验结果表明:催化剂投加量为50 mg/L、亚甲基蓝初始浓度为4 mg/L、模拟废水溶液的初始pH=1、降解时间220 min时,废水降解率可达到99.2%。光催化动力学分析显示,以合成杂多酸盐为催化剂光催化降解亚甲基蓝废水降解过程满足一级动力学方程,该一级方程反应速率常数为0.0144 min^-1,拟合常数为0.9918。另外,此催化剂还表现出较好的重复使用性能,连续使用5 次后降解率仍为92.4%。

关键词: 水热自组装, 杂多酸盐, 亚甲基蓝, 光催化, 降解率

Abstract:

[PMo₈V₆O₄₂][Co(Phen)₂][Him]₂·2H₃O·3H₂O(1) was prepared by hydrothermal synthesis method and characterized by means of IR, Raman, UV, XRD and XPS. Its photocatalytic performance toward degradation of methylene blue wastewater was investigated. Under the optimized conditions, i.e., catalyst dosage of 50 mg/L, 4 mg/L methylene blue at pH=1 and the reaction time 220 min, 99.2% of the methylene blue is degraded photocatalytically. The kinetics of the photodegradation of methylene blue is satisfied by the pseudo-first-order equation, with a constant at 0.0144 min^-1, and fitting coefficient of 0.9918. The photocatalyst also exhibits good reusability. The degradation rate for methylene blue still keeps at 92.4% after 4 recycles.

Key words: hydrothermal, polyoxometalate salt, methylene blue, photocatalysis, degradation

石淑云, 任百祥. 新型杂多酸盐光催化降解亚甲基蓝染料废水[J]. 应用化学, 2016, 33(5): 577-582.

SHI Shuyun, REN Baixing. Photocatalytic Degradation of Methylene Blue Wastewater by Novel Polyoxometalates Salt[J]. Chinese Journal of Applied Chemistry, 2016, 33(5): 577-582.

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