Thermally treated fungal manganese oxides for bisphenol A degradation using sulfate radicals
Thermally treated fungal manganese oxides for bisphenol A degradation using sulfate radicals
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DOI：
10.1016/j.cej.2017.11.025
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发表时间：
2018-03
影响因子：
15.1
通讯作者：
Yi Xie;Panyu Li;Yu Zeng;Xiang Li;Yaxiong Xiao;Yabo Wang;Yongkui Zhang
中科院分区：
文献类型：
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作者：
Yi Xie;Panyu Li;Yu Zeng;Xiang Li;Yaxiong Xiao;Yabo Wang;Yongkui Zhang
真菌氧化锰（FMO）是一种广泛存在于环境中的具有生物活性的矿物相，被认为是一种很有前途的催化材料。在这项研究中，层状FMO是由锰（II）氧化真菌产生的。在不同温度下热处理后，FMO转化为不同形貌的锰氧化物（MnO 2，Mn 2 O3和Mn 3 O 4）。以锰氧化物为催化剂，活化过硫酸根（PMS）产生硫酸根自由基，高效降解双酚A（BPA）。催化性能评价结果表明，400 °C焙烧的FMO对双酚A有较好的降解效果。在30 min内，BPA完全降解，TOC去除率达97%。考察了催化剂用量、PMS负载量、溶液pH值和反应温度对BPA降解率的影响。在循环实验中，BPA的降解效率明显降低，这是由于催化反应中间体在催化剂表面的覆盖。幸运的是，热处理可以恢复催化剂，与再生催化剂相比具有完全的BPA降解效率。通过GC-MS和LC-MS对双酚A的中间体进行鉴定，提出了双酚A的降解途径。
Fungal manganese oxide (FMO) is ubiquitous in the environment and believed to be a promising material for catalysis due to its biological reactive mineral phases. In this study, layered FMO was produced by Mn (II)-oxidizing fungus. After thermal treatment at various temperatures, FMO was converted to manganese oxides (MnO2, Mn2O3and Mn3O4) with different morphologies. The as-obtained manganese oxides were adopted as catalysts for peroxymonosulfate (PMS) activation to produce sulfate radicals, which were highly efficient for bisphenol A (BPA) degradation. Catalytic evaluation showed that FMO calcined at 400 °C performed well for BPA degradation. Complete BPA degradation and 97% TOC removal in solution could be achieved in 30 min. Effects of catalyst dosage, PMS loading, solution pH and reaction temperature on BPA degradation efficiencies were also investigated. In recycle study, remarkable decrease of BPA degradation efficiency was found, which was ascribed to the coverage of catalytic reaction intermediates on the surface of catalyst. Fortunately, heat treatment could recover the catalyst with a complete BPA degradation efficiency over regenerated catalyst. Furthermore, a BPA degradation pathway was proposed based on intermediates identification by GC-MS and LC-MS.