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锰氧化物八面体分子筛活化过一硫酸氢盐降解酸性橙7 被引量:2

Heterogeneous activation of peroxymonosulfate by cryptomelane type manganese oxide for Acid Orange 7 degradation in aqueous solutions
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摘要 采用无溶剂法制备了氧化锰八面体分子筛(OMS-2),通过XRD、FT-IR、SEM、TEM及N2吸附-脱附等温线等对其结构进行了表征,并以典型难降解偶氮染料酸性橙7(AO7)为目标污染物,考察了OMS-2活化过一硫酸氢盐(PMS)降解AO7的性能。研究结果发现,无溶剂法制备的OMS-2呈纳米棒状,为典型的锰钾矿型结构,比表面积达到129 m2·g-1,平均粒径10.5 nm左右。OMS-2催化剂能够高效催化PMS产生活性自由基降解偶氮染料,反应10 min内可使AO7几乎完全脱色,重复使用10次均能保持较高的催化稳定性;脱色降解后染料分子中的共轭体系和芳香环结构被破坏。 Cryptomelane-type manganese oxide,OMS-2,was prepared by a solvent-free process,and characterized by X-ray diffraction,scanning electron microscopy,N2 adsorption/desorption isotherms,and fourier transform infrared spectroscopy. The activity and stability of the catalyst were tested for degradation of Acid Orange 7( AO7) in the presence of peroxymonosulfate. OMS-2 exhibited the typical cryptomelane phase with a nanorod morphology,and had a surface area of 129 m2·g-1and crystallite size of 11 nm. The catalyst was quite active for AO7 degradation,with production of sulfate radicals; AO7 was completely decolorized within 10 min due to the destruction of its conjugate structure and naphthaquinone ring. The catalyst also exhibited a high stability over ten cycles.
作者 熊易玄 柯雪珍 陈成 徐爱华 XIONG Yixuan, KE Xuezhen, CHEN Cheng, XU Aihua(School of Environmental Engineering, Wuhan Textile University, Wuhan 430200, China)
出处 《环境工程学报》 CAS CSCD 北大核心 2016年第10期5600-5604,共5页 Techniques and Equipment for Environmental Pollution Control
基金 国家自然科学基金资助项目(21207015)
关键词 氧化锰八面体分子筛 过一硫酸氢盐 酸性橙7 降解 cryptomelane type manganese oxide peroxymonosulfate Acid Orange 7 degradation
作者简介 熊易玄(1994-),女,本科生,研究方向:环境污染治理。E—mail:467026849@qq.com 通讯联系人,E-mail:xahspincl@sina.com
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