摘要
研究了3种纳米铁系金属制剂(nZVI、nZVI/Ni、nZVI/Pd)在类Fenton氧化法中对水中2,4-二氯苯酚(2,4-DCP)降解效率的影响,同时与纳米铁系金属制剂还原脱氯降解2,4-DCP效果比较.结果表明:1.0 g.L-1Fe、100 mg.L-12,4-DCP,反应180 min,nZVI,nZVI/Ni,nZVI/Pd和Fe2+对水中2,4-DCP去除率分别为6.48%,6.80%,15.95%和5.02%;而在类Fenton氧化法中,nZVI,nZVI/Ni,nZVI/Pd和Fe2+对2,4-DCP去除率分别是57.87%,34.23%,27.94%和19.61%,清楚表明纳米双金属有催化还原脱氯活性,但在类Fenton法中,由于纳米双金属的催化活性导致H2O2分解,使得nZVI更有利于类Fenton氧化降解2,4-DCP.SEM、EDS和XRD表征说明:由于Fe2+溶出,nZVI在类Fenton反应前后的表面微观结构发生微小变化;FTIR与TOC(矿化率30.71%)结果进一步证明2,4-DCP被氧化降解.此外,条件实验发现pH和2,4-DCP初始质量浓度对类Fenton法降解2,4-DCP有较大的影响,其氧化降解过程符合伪一级动力学,是一个扩散控制过程.
Various iron-based nanoparticles （nZVI, nZVI/Ni, nZVI/Pd） used ous catalyst for Fenton oxidation of 2,4-dichlorophenol （2,4-DCP） were investigated as heterogene- , and were also compared with their dechlorination of 2,4-DCP to understand their roles in the Fenton oxidation and the reduction of 2,4-DCP. The results show that the reduction dechlorination of 2,4-DCP by nZVI, nZVI/Ni, nZVI/Pd and Fe2＋ were 6.48%, 6. 80%, 15.95%, 5.02%, while Fenton oxidation of 2,4-DCP by nZVI, nZVI/Ni, nZVI/Pd and FeE＋ were 57.87%, 34.23%, 27.94%, 19.61%, respectively. Obviously, a higher reduction dechlorination from the bimetallic nanoparticles resulted in their catalytic activity, but nZVI activity is higher in heterogeneous Fenton oxidation due to the catalytic activity of bimetallic nanoparticles accelerated the HE O2 decomposition. In addition, the re- suits obtained from SEM, EDS and XRD demonstrate that part of change on the surface of nZVI was observed due to the Fe2＋ leaching, and FTIR and TOC （30.71%） shows that 2,4-DCP was degrad- ed. Furthermore, the condition experiments indicate that the pH values and concentration of 2,4-DCP significantly impacted on the heterogeneous Fenton oxidation of 2,4-DCP. The data fit well with the pseudo first-order kinetic model, which was a diffusion-controlled reaction.
出处
《福建师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第4期57-64,共8页
Journal of Fujian Normal University：Natural Science Edition
基金
福建师范大学闽江学者人才引进基金资助项目(200604)
