摘要
采用Fenton试剂(Fe3+/H2O2)在可见光条件下(λ>450 nm)光催化降解目标染料化合物罗丹明B(Rhodam ine B,RhB).在pH<3.0体系中用可见光照射,能使RhB染料在光敏化作用下有效降解,反应160m in后矿化率达到71.8%.采用ESR和溴甲酚绿(B romocresol green,BCG)法跟踪测定活性氧化物种,通过对RhB降解过程的紫外-可见光谱、红外光谱分析及总有机碳量(TOC)跟踪测定,结果表明,Fe3+/H2O2/RhB体系在可见光照射下主要的活性氧化物种为羟基自由基,能有效地降解RhB.
A photooxidative system for degradation of organic dye pollutant RhB as an objective compound was reported under visible irradiation（A 〉 450 nm） by using Fe^3＋/H2O2 as the Fenton reagent. It was found that, in the system with pH 〈 3.0, visible light irradiation significantly accelerates the degradation process by photosensitive effect. After 160 min the RhB was mineralized with a yield of 71.8%. Bromocresol green reaction spectrophotometrically, spin-trapping electron paramagnetic resonance, UV-Vis spectroscopy, IR and total organic carbon（TOC） measurements were used to detect the photoreaction process. The photocatalytic degradation pathway mainly involves the formation of OH and carboxylie acids are the main intermediate products. H2O2 of Fe^3＋/H2O2/RhB system was utilized lowlier than that of supermolecular metal/organie complexes or supported catalysts system.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第12期2273-2278,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20373074)
国家重点基础研究发展计划(批准号:2003CB415006-3)
湖北省高层次人才基金资助
