Zhang Li-Ming, Chen Jia-Bin, Li Wen-Wei, Wang Zhong-Ming, Huang Tian-Yin
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China.
Huan Jing Ke Xue. 2016 Jul 8;37(7):2601-2609. doi: 10.13227/j.hjkx.2016.07.024.
Carbon nanotube (CNT) was used as an activator to activate peroxymonosulfate (PMS) to degrade azo dye orange G (OG) in aqueous solution. The results indicated that CNT exhibited a much better performance in activating PMS to decolorize OG than activated carbon (GAC), with 99% decolorization of OG achieved within 45 min. Afterwards, the degradation mechanism of OG in CNT activated PMS system was explored, and SO·was found to be dominantly responsible for OG degradation, which mainly took place on the surface of CNT. Effects of various factors, including temperatures, initial concentration of OG, CNT loadings, PMS dosage, and initial pH, on degradation of OG were then investigated, and OG degradation in these cases well conformed to first-order kinetics. From the analysis of UV-vis spectra of OG during the reaction, the peaks at 479 nm and 330 nm were found to be significantly decreased, suggesting that the azo band and naphthaline ring were destructed, respectively. Finally, TOC analysis indicated that a certain degree of OG mineralization was obtained in CNT activated PMS system.
碳纳米管（CNT）被用作活化剂来活化过一硫酸盐（PMS），以降解水溶液中的偶氮染料橙G（OG）。结果表明，与活性炭（GAC）相比，CNT在活化PMS使OG脱色方面表现出更好的性能，在45分钟内实现了OG 99%的脱色。随后，探讨了OG在CNT活化PMS体系中的降解机制，发现SO·是OG降解的主要原因，降解主要发生在CNT表面。然后研究了各种因素，包括温度、OG初始浓度、CNT负载量、PMS用量和初始pH值对OG降解的影响，这些情况下OG的降解均符合一级动力学。通过对反应过程中OG的紫外可见光谱分析，发现479nm和330nm处的峰明显降低，表明偶氮带和萘环分别被破坏。最后，TOC分析表明，在CNT活化PMS体系中OG实现了一定程度的矿化。
