使用纳米级零价铁催化剂通过非均相类芬顿反应降解4-氯-3,5-二甲基苯酚
Degradation of 4-Chloro-3,5-Dimethylphenol by a Heterogeneous Fenton-Like Reaction Using Nanoscale Zero-Valent Iron Catalysts.
作者信息
Xu Lejin, Wang Jianlong
机构信息
Laboratory of Environmental Technology, INET, Tsinghua University , Beijing, China .
出版信息
Environ Eng Sci. 2013 Jun;30(6):294-301. doi: 10.1089/ees.2012.0025.
Abstract
Degradation of 4-chloro-3,5-dimethylphenol (PCMX) by a heterogeneous Fenton-like process using nanoparticulate zero-valent iron (nZVI) and hydrogen peroxide (HO) at pH 6.3 was investigated. Interactive effects of three factors-initial PCMX concentration, nZVI dosage, and HO concentration-were investigated using the response surface method based on the Box-Behnken design. Experimental results showed that complete decomposition of PCMX and 65% of total organic carbon removal were observed after 30 min of reaction at neutral pH under recommended reaction conditions: nZVI, 1.0 g/L; HO, 18 mM; and initial PCMX concentration, 0.15 g/L. Based on the effects of scavengers -butanol and KI, removal of PCMX was mainly attributed to the attack of •OH, especially the surface-bonded •OH. A possible degradation pathway of PCMX was proposed.
摘要
研究了在pH 6.3条件下，使用纳米零价铁（nZVI）和过氧化氢（HO）通过非均相类芬顿过程降解4-氯-3,5-二甲基苯酚（PCMX）。基于Box-Behnken设计，采用响应面法研究了初始PCMX浓度、nZVI用量和HO浓度这三个因素的交互作用。实验结果表明，在推荐反应条件下，即nZVI为1.0 g/L、HO为18 mM、初始PCMX浓度为0.15 g/L时，在中性pH条件下反应30分钟后，PCMX完全分解，总有机碳去除率达65%。基于清除剂（正丁醇和KI）的影响，PCMX的去除主要归因于•OH的攻击，尤其是表面键合的•OH。提出了PCMX可能的降解途径。
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