Humic acid coated Fe3O4 magnetic nanoparticles as highly efficient Fenton-like catalyst for complete mineralization of sulfathiazole
Humic acid coated Fe3O4 magnetic nanoparticles as highly efficient Fenton-like catalyst for complete mineralization of sulfathiazole
复制标题
腐殖酸包覆 Fe3O4 磁性纳米颗粒作为高效类芬顿催化剂，用于磺胺噻唑的完全矿化
DOI：
10.1016/j.jhazmat.2011.03.086
复制
发表时间：
2011-06-15
影响因子：
13.6
通讯作者：
Cai, Yaqi
中科院分区：
文献类型：
--
作者：
Niu, Hongyun;Zhang, Di;Cai, Yaqi
制备了腐植酸包被Fe3O4磁性纳米颗粒（Fe3O4/HA），用于去除水中的磺胺噻唑。Fe3O4/HA通过催化分解H2O2产生羟基(OH)- o中心点)自由基的活性较高。磺胺噻唑的降解具有强烈的温度依赖性，且有利于酸性溶液的降解。随着Fe3O4/HA用量和H2O2浓度的增加，催化速率提高。当溶液中加入3 g L-1 Fe3O4/HA和0.39 M H2O2时，大部分磺胺噻唑在1 h内被降解，反应时间（6 h）去除了约90%的总有机碳（TOC）。最终产物主要为环境友好型离子或无机分子（SO42-、CO2和N-2）。相应的磺胺噻唑和TOC的降解速率(k)分别为0.034和0.0048 min（-1）。而当以3 g L-1的裸Fe3O4作为催化剂时，TOC的去除率仅为54%，且在6 h内未检出SO42-，对磺胺噻唑和TOC的降解率分别为0.01和0.0016 min（-1）。Fe3O4/HA的高催化能力可能是由于配合物Fe(II)-HA或Fe(III)-HA之间的电子转移，导致Fe（II）种的快速再生和(OH)- o中心点自由基的产生。(C) 2011 Elsevier B.V.版权所有
Humic acid coated Fe3O4 magnetic nanoparticles (Fe3O4/HA) were prepared for the removal of sulfathiazole from aqueous media. Fe3O4/HA exhibited high activity to produce hydroxyl ((OH)-O-center dot) radicals through catalytic decomposition of H2O2. The degradation of sulfathiazole was strongly temperature-dependent and favored in acidic solution. The catalytic rate was increased with Fe3O4/HA dosage and H2O2 concentration. When 3 g L-1 of Fe3O4/HA and 0.39 M of H2O2 were introduced to the aqueous solution, most sulfathiazole was degraded within 1 h, and >90% of total organic carbon (TOC) were removed in the reaction period (6 h). The major final products were identified as environmentally friendly ions or inorganic molecules (SO42-, CO2, and N-2). The corresponding degradation rate (k) of sulfathiazole and TOC was 0.034 and 0.0048 min(-1), respectively. However, when 3 g L-1 of bare Fe3O4 were used as catalyst, only 54% of TOC was eliminated, and SO42- was not detected within 6 h. The corresponding degradation rate for sulfathiazole and TOC was 0.01 and 0.0016 min(-1), respectively. The high catalytic ability of Fe3O4/HA may be caused by the electron transfer among the complexed Fe(II)-HA or Fe(III)-HA, leading to rapid regeneration of Fe(II) species and production of (OH)-O-center dot radicals. (C) 2011 Elsevier B.V. All rights reserved.