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Degradation of 4-Chloro-35-Dimethylphenol by a Heterogeneous Fenton-Like Reaction Using Nanoscale Zero-Valent Iron Catalysts

机译:纳米零价铁催化剂通过非均相类Fenton反应降解4-氯-35-二甲基苯酚

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摘要

Degradation of 4-chloro-3,5-dimethylphenol (PCMX) by a heterogeneous Fenton-like process using nanoparticulate zero-valent iron (nZVI) and hydrogen peroxide (H2O2) at pH 6.3 was investigated. Interactive effects of three factors—initial PCMX concentration, nZVI dosage, and H2O2 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; H2O2, 18 mM; and initial PCMX concentration, 0.15 g/L. Based on the effects of scavengers n-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.
机译:研究了使用pH 6.3的纳米零价铁(nZVI)和过氧化氢(H2O2)的非均相类Fenton法降解4-氯-3,5-二甲基苯酚(PCMX)。使用基于Box–Behnken设计的响应面方法研究了三个因素(初始PCMX浓度,nZVI剂量和H2O2浓度)的相互作用。实验结果表明,在推荐的反应条件:nZVI,1.0μg/ L;中性pH下,反应30μmin,PCMX完全分解,有机碳去除总量的65%。 H2O2,18µmM; PCMX的初始浓度为0.15μg/ L。根据清除剂正丁醇和KI的影响,PCMX的去除主要归因于•OH的侵蚀,尤其是表面键合的•OH的侵蚀。提出了PCMX可能的降解途径。

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