Preparation and degradation properties of magnetic Fe3O4/modified coke

doi:10.16085/j.issn.1000-6613.2016-2176

Abstract

Abstract: Modified coke was firstly prepared from coke by KOH activation and then Fe₃O₄/modified coke was prepared by in-situ oxidation precipitation method.The catalyst and samples were characterized by scanning electron microscopy (SEM),nitrogen adsorption isotherms (BET),Fourier transform infrared spectroscopy (FTIR),X-ray powder diffractometer (XRD) and vibrating sample magnetometer (VSM),and the catalytic degradation performance of Rhodamine B (RhB) was studied.The results show that the modified coke has rough surface and well-developed pore structure.Moreover,the oxygen-containing functional groups of modified coke are abundant.Fe₃O₄ was dispersed and firmly loaded on the modified coke,making the latter is smaller than the pure Fe₃O₄.Fe₃O₄/modified coke possessed superparamagnetism,and its degradation of RhB could be regarded as pseudo first-order reaction.The best degradation conditions were as follow:[catalysts]=0.8g/L,initial[H₂O₂]=30mmol/L,pH=3.0 and T=35℃.There is a synergistic effect between Fe₃O₄ and modified coke,giving rise to the removal rate of RhB of 98.85%.Therefore,Fe₃O₄/modified coke is a magnetic catalyst with good stability and recyclability.

Key words: modified coke, magnetic catalyst, Fenton-like, degradation, stability

摘要： 以KOH为活化剂对焦炭进行活化制备改性焦炭，并采用原位氧化沉淀法制备出Fe₃O₄/改性焦炭，采用扫描电子显微镜（SEM）、N₂吸附脱附（BET）、傅里叶交换红外光谱（FTIR）、X射线衍射（XRD）及振动样品磁强计（VSM）对样品进行表征，并且研究了其对罗丹明B的催化降解性能。结果表明，改性焦炭表面粗糙，孔结构发达，含氧官能团丰富，Fe₃O₄分散且牢固地负载于改性焦炭上，其粒径比纯Fe₃O₄小。Fe₃O₄/改性焦炭具有超顺磁性，对罗丹明B的降解为拟一级反应，其降解的最佳条件为：催化剂用量为0.8g/L，H₂O₂初始浓度为30mmol/L，pH为3.0，温度为35℃。Fe₃O₄与改性焦炭存在协同催化作用，罗丹明B的去除率可达98.85%。Fe₃O₄/改性焦炭是一种稳定、易磁分离回收利用的磁性催化剂。

关键词: 改性焦炭, 磁性催化剂, 类Fenton, 降解, 稳定性

CLC Number:

TQ426.8

WEI Xiaobi, WANG Guanghua, LI Wenbing, WAN Dong, LIU Yang, SHAO Qiutong. Preparation and degradation properties of magnetic Fe₃O₄/modified coke[J]. Chemical Industry and Engineering Progress, 2017, 36(07): 2577-2583.

魏晓币, 王光华, 李文兵, 万栋, 刘阳, 邵秋桐. 磁性Fe₃O₄/改性焦炭的制备及其降解性能[J]. 化工进展, 2017, 36(07): 2577-2583.

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Preparation and degradation properties of magnetic Fe₃O₄/modified coke

磁性Fe₃O₄/改性焦炭的制备及其降解性能

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