| 磁性纳米复合物非均相类Fenton反应催化降解罗丹明B |
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| 引用本文： | 徐冬莹,余静,郑婉懿,翟婉婷,杨翔,杨松林.磁性纳米复合物非均相类Fenton反应催化降解罗丹明B[J].环境科学学报,2018,38(9):3614-3621. |
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| 作者姓名： | 徐冬莹 余静 郑婉懿 翟婉婷 杨翔 杨松林 |
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| 作者单位： | 成都信息工程大学资源环境学院 |
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| 基金项目： | 国家自然科学基金（No.51608061）；成都信息工程大学大学生创新创业训练项目（No.201710621076） |
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| 摘 要： | 以锰锌铁氧体Mn0.6Zn0.4Fe2O4(Fe-MNPs)为磁核,利用正硅酸乙酯(TEOS)水解制备得到可磁分离的"核-壳"结构纳米复合物Mn0.6Zn0.4Fe2O4@Si O2(Si-Fe-MNCs),并采用X射线衍射(XRD)、N2吸附-脱附、扫描电镜(SEM)、透射电镜(TEM)、X射线光电子能谱(XPS)和振动样品磁强计(VSM)对Si-Fe-MNCs进行了表征.同时,以难生物降解染料罗丹明B(Rh B)为目标污染物,利用Si-Fe-MNCs催化过氧化氢降解Rh B,考察了不同体系、过氧化氢用量、催化剂投加量及温度等对催化活性的影响.结果表明,当温度为303 K,催化剂用量为0.5 g·L-1,过氧化氢(质量分数15%)加入量为4 m L,Rh B(20 mg·L~(-1))加入量为50 m L时,H2O2利用率为81.3%,罗丹明B降解率为95%,CODC r去除率为98.0%;自由基验证实验及XPS表征结果表明,Rh B与Si-Fe-MNCs催化H2O2产生的·OH反应而得以降解,该反应为固液界面催化反应,FeMNPs中存在的氧空位对催化反应起到协同强化作用.
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| 关 键 词： | 磁分离 非均相 类Fenton 罗丹明B 降解 |
| 收稿时间： | 2018/1/12 0:00:00 |
| 修稿时间： | 2018/2/9 0:00:00 |
Magnetic nanoscaled Si-Fe-MNCs as an efficient Fenton-like heterogeneous catalyst for degradation of Rhodamine B |
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| XU Dongying,YU Jing,ZHENG Wanyi,ZHAI Wanting,YANG Xiang and YANG Songlin.Magnetic nanoscaled Si-Fe-MNCs as an efficient Fenton-like heterogeneous catalyst for degradation of Rhodamine B[J].Acta Scientiae Circumstantiae,2018,38(9):3614-3621. |
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| Authors: | XU Dongying YU Jing ZHENG Wanyi ZHAI Wanting YANG Xiang and YANG Songlin |
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| Institution: | College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225,College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225,College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225,College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225,College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225 and College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225 |
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| Abstract: | An effective magnetically separable nanoscaled shell-core Mn0.6Zn0.4Fe2O4@SiO2(Si-Fe-MNCs) composite has been prepared by coating SiO2 on the surface of Mn0.6Zn0.4Fe2O4 (Fe-MNPs) through in-situ hydrolysis of tetraethylorthosilicate (TEOS) and characterized as a heterogeneous Fenton-like catalyst for Rhodamine B (RhB) degradation. Si-Fe-MNCs was characterized by X-ray diffraction (XRD),N2 adsorption/desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) and vibrating sample magnetometer (VSM),respectively. The catalytic activity was evaluated in view of the effects of various processes, catalyst addition, hydrogen peroxide (H2O2) concentration, and temperature. The results show that optimal conditions for MB degradation was 303 K with 4 mL 15%H2O2, 0.5 g·L-1 Si-Fe-MNCs, and 50 mL 20 mg·L-1 RhB. The utilization efficiency of H2O2 was calculated as 81.3%, and the degradation efficiency of RhB and CODCr was 95.0% and 98.0%, respectively. On the basis of the effects of radical scavengers and results of X-ray photoelectron spectra (XPS) analysis, RhB was decomposed mainly by the attack of hydroxyl radicals (·OH) and the catalytic ability of Si-Fe-MNCs is strengthened through surface catalytic reaction and electronic transfer of oxygen vacancies of Fe-MNPs during catalytic reaction. |
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| Keywords: | magnetically separable heterogeneous Fenton-like Rhodamine B degradation |
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