摘要
通过NaY型分子筛负载Fe3+制备异相Fenton催化剂(FeY),采用FeY在可见光(λ>420 nm)照射下研究其降解染料罗丹明B(RhB)和2,4-二氯苯酚(DCP).通过对RhB降解过程的紫外-可见光谱、ESR和红外光谱分析,以及总有机碳量(TOC)的跟踪测定,FeY/H2O2体系在可见光照射下能有效地降解RhB,降解反应主要涉及到.OH自由基的产生和参与.RhB/FeY/H2O2体系在可见光照射下,反应270min,RhB脱色率达到100%,TOC去除率达75.6%.DCP/FeY/H2O2体系在可见光照射下,反应150min,DCP降解率达81.0%.利用酶催化反应米氏方程测定催化剂的活性,FeY催化常数Kcat=2.28×105mol.l-1.min-1.
Fe^3＋ supported on NaY zeolite as an effective catalyst for heterogeneous oxidation was prepared.The catalyst was applied for the degradation of Rhodamine B（RhB） and 2,4-dichlorophenol（DCP）under visible irradiation（λ〉420nm）.UV-Vis spectroscopy,IR,total organic carbon（TOC）and ESR measurements were employed to detect the photoreaction process.Based on the result of ESR indicated that the oxidative process was predominated mainly by the ·OH radical generated in the system.The results showed that RhB could be efficiently degraded by choosed RhB/FeY/H2O2 system under visible irradiation with 100% decolorization and 75.6% TOC removal after 270 min reaction.FeY could be excitated by visible light.After reaction 150min DCP was degraded 81.0% at the choosed DCP/FeY/H2O2 system under visible irradiation.Michaelis-Meenten equation was used to indicate it catalytic characteristic and the catalytic constant Kcat was 2.28×10^5 mol·l^-1·min^-1.
出处
《环境化学》
CAS
CSCD
北大核心
2008年第1期6-10,共5页
Environmental Chemistry
基金
国家自然科学基金(2037374,50639070)
湖北省青年杰出人才基金(2005ABB030)
湖北省防灾减灾重点实验室开放基金(2004ZS02)资助项目.
