Fe、Mn掺杂干凝胶的制备、表征及催化臭氧氧化邻二氯苯性能.pdf

物理化学学报( Wuli Huaxue Xuebao)
September
Acta Phys..-Chim.Sin.,2010,26(9):2443-2448
2443
[ Article
www.whxb.pku.edu.cn
Fe、Mm掺杂干凝胶的制备、表征及催化臭氧氧化邻二氯苯性能
黄燕张兴旺雷乐成
(浙江大学化学工程与生物工程学系,工业生态与环境研究所,杭州310027)
摘要:采用溶胶凝胶法制备Fe、Mn掺杂的干凝胶材料(XFe和XMn),并对其催化臭氧氧化去除邻二氯苯(o-
DCB)的性能进行了研究.通过X射线光电子能谱(XPS)、X射线衍射(XRD)、透射电镜(TEM)、扫描电镜(SEM)
压汞仪和氮气吸附等技术对Fe、Mn掺杂的干凝胶材料进行表征.结果表明:XFe和XMn中存在三价金属氧化
物等活性物种,金属相无明显的衍射峰且金属颗粒的尺寸较小,表明金属颗粒在千凝胶载体上获得较好的分散
性;相比于单独臭氧氧化时44%的o-DCB去除率,XFe和XMn的添加使得o-DCB去除率分别达到58%和
72%,XFe和XMn显示了较好的催化活性;XFe和XMn的金属溶出状况不同,在水溶液中浸泡5h后它们的金
属溶出率分别为2%和8%左右.
关键词:溶胶凝胶法;干凝胶;表征;催化臭氧化;邻二氯苯
中图分类号:O643
Preparation, Characterization and Catalytic Activity for ortho
Dichlorobenzene Ozonation of Fe-, Mn-doped Xerogels
HUANG Yan ZHANG Xing-wang LEI Le-cheng
Institute of Industrial Ecology and Environment, Department of Chemical and Biological Engineering,
Zhejiang University, Hangzhou 310027, P. R. China,
Abstract: Metal-doped xerogels were synthesized by the sol-gel method and their catalytic performance was
evaluated for the catalytic ozonation of simulated micro-pollued water containing ortho-dichlorobenzene(o-dcb
The obtained samples were characterized by X-ray hotoelectron spectroscopy( PS), transmission electron microscopy
(TEM) X-ray diffraction(XR D ), scanning electron microscopy(SEM), mercury porosimetry and nitrogen adsorption
Results show that Fe *oxides and Mn*oxides are present in the Fe-doped xerogel (Fe)and the Mn-doped Xerogel
(XMN), respectively. No obvious diffraction peaks corresponding to a metallic phase were present in the XRD patterns
of the xerogels. Also, the metallic particles were found to be small; therefore, the metallic particles were well
distributed over the xerogel supports. Catalytic ozonation experiments indicated that the removal rate of O-DCB was
44% with single ozonation, and this increased to 58 and 72% with catalytic ozonation using XFE and Xmn,
respectively, which suggests that metal-doped xerogels are promising catalysts for the ozonation process. We also
investigated metal leaching from the metal-doped xerogel to the water solution to test the stability of the catalysts, and
about 2% and 8% metal leaching for Xfe and XMN was obtained within 5 h.
Key Words: Sol-gel method; Xerogel; Characterization; Catalytic ozonation; ortho-dichlorobenzene
Received: February 25, 2010; Revised: May 3, 2010; Published on Web July 2, 2010
Corresponding author. Email lclei@zju.edu. n, lable@zju.edu. n; Te/Fax: +86-571-
The project was sued te National Natural ene Foundation of China(0600 00), Scin and Technoloy Deparment of
Zhejiang Province, China(0007C13061), and National High Technology Research and Development Program of China(2007AA06Z339,
2008BAC32B06,2007AA06A409)
国家自然科学基金(20836008,0633003),浙江省科技计划项目(2007C13061)和国家高技术研究发展计划(2007AA06239,2008BAC32B06
2007AAO6A409)资助
O Editorial office of Acta Physico-chimica Sinica