Fe-MCM-41催化臭氧氧化间甲酚废水  

Degradation of m-Cresol with Fe-MCM-41 in Catalytic Ozonation

作　　者：孙文静[1,2] 王亚旻 卫皇曌[1] 王森[1,2] 李旭宁[1] 李敬美[1] 孙承林[1] 安路阳[3] 

机构地区：[1]中国科学院大连化学物理研究所,大连116023 [2]中国科学院大学化学与化工学院,北京100049 [3]中钢集团鞍山热能研究院有限公司,炼焦技术国家工程研究中心,鞍山114044

出　　处：《环境科学》2015年第4期1345-1351,共7页Environmental Science

摘　　要：首次应用Fe-MCM-41催化臭氧氧化间甲酚废水.研究了铁的掺杂质量分数、催化剂质量浓度和底物质量浓度对间甲酚转化率和TOC去除率的影响,并采用XRD、H2-TPR、穆斯堡尔谱、BET对催化剂的结构性质进行表征.结果表明,铁的掺杂质量分数对Fe-MCM-41在催化臭氧氧化间甲酚中的活性具有较大影响,最佳掺杂质量分数为4.4%.随着铁掺杂质量分数的提高,介孔分子筛的结晶度减弱,介孔结构晶面间距减小,比表面积、孔容、平均孔径整体上呈下降趋势,Fe在介孔分子筛表面仅以γ-Fe2O3形式存在,且催化剂具有良好的铁磁性和稳定性.臭氧在反应中既有直接氧化作用也有间接氧化作用,且二者比近似为1∶1.在模型废水原始p H值条件下,使用Fe掺杂质量分数为4.4%的催化剂,当间甲酚初始质量浓度为500mg·L-1,催化剂质量浓度为0.1 g·L-1时,30 min内间甲酚转化率为100%,TOC去除率为26.8%.Fe-MCM-41 was first used for the treatment of m-cresol in catalytic ozonation. The effect of the percentage of Fe dopping mass, catalyst dosage and the natural concentration of substrate on m-cresol conversion and TOC removal were studied. The structural property of Fe-MCM-41 was characterized by X-ray diffraction, temperature-programmed reduction, Mōssbauer spectra and BET of catalysts. The results showed that Fe dopping mass had a great effect on the catalytic activity of Fe-MCM-41 in catalytic ozonation and the optimal percentage of dopping mass was 4.4% （wt）. The results showed that with Fe dopping mass increase, the degree of crystallinity became weaker, the crystal surface distance reduced,as well as the specific surface area,pore volume and aperture. γ- Fe2O3 was the only form staying on the surface of MCM-41, and the catalyst had good ferromagnetism and stability. Ozonation played a role of both direct oxidation and indirect oxidation in the reaction, approximately the same ratio. Under the experimental condition of the natural pH of model wastewater,using 4.4% （wt） Fc-MCM-41 as catalyst, natural concentration of m-cresol 500 mg· L^-1 , catalyst dosage 0. 1 g· L^-1 and reaction time 30 min, m-cresol conversion and TOC removal were 100% and 26.8% ,respectively.

关 键 词：Fe-MCM-41 间甲酚 臭氧 催化臭氧氧化 多相催化 

分 类 号：X703.1[环境科学与工程—环境工程]