UV/Fe(Ⅲ)-富马酸盐体系降解对硝基苯酚  

Degradation of p-Nitrophenol in Fe( Ⅲ)-Fumarate System under Ultraviolet Irradiation

作　　者：孙杰[1] 陈果仓[1] 曾沛[1] 

机构地区：[1]中南民族大学环境工程研究所,武汉430074

出　　处：《化学通报》2014年第8期814-818,共5页Chemistry

基　　金：国家自然科学基金项目(21007018);湖北省自然科学基金项目(2008CDB400)资助

摘　　要：研究了在紫外光（UV）照射下,Fe（Ⅲ）-富马酸盐体系对p-硝基苯酚（PNP）的光降解反应,考察了溶液pH、Fe（Ⅲ）、富马酸盐和PNP的初始浓度对PNP降解率的影响.结果表明,UV/Fe（Ⅲ）-富马酸盐体系对PNP有光降解作用,相比于只含Fe（Ⅲ）或者富马酸盐体系,同时加入Fe（Ⅲ）与富马酸盐构成的体系在降解PNP方面有协同作用.在pH 3.0 ～6.0范围内,PNP的降解率随着pH和PNP初始浓度的增大而降低,而随着Fe（Ⅲ）和富马酸盐的初始浓度的增大而增大.氯仿猝灭法证实,该体系在降解PNP反应过程中产生了超氧负离子自由基;采用荧光法和异丙醇猝灭法证实了该体系在反应过程中产生了羟基白由基,同时证实了羟基自由基为PNP光降解反应的主要反应物质.Abstract Photo-degradation of p-nitrophenol （PNP） was studied in the Fe （ Ⅲ ）-fumarate system under UV irradiation. The effects of pH, the initial concentrations of Fe（ Ⅲ ） , fumarate and PNP were also discussed in detail. The results indicated that there was a synergic effect between Fe （ Ⅲ） and fumarate for removal of PNP compared with bare Fe（ Ⅲ ） or fumarale. The degradation rate of PNP increased with the increase of acidity in the pH range of 3.0 6.0 in the Fe （ Ⅲ ）-fumarate system or decrease of the initial concentration of PNP or increase of the initi＇al concentration of Fe （Ⅲ） and Fumarate. The experiments had confirmed that the system produced the ultra-oxygen anion radicals by quenching method with chloroform as a quenching agent and hydroxyl radicals by fluorescence method and quenching with isopropanol as a quencher in the process of photo-degradation of PNP in the Fe （Ⅲ） fumarate system under 15V irradiation, and hydroxyl radicals were the main reactant in the degradation reaction.

关 键 词：Fe(Ⅲ)-富马酸盐配合物 对硝基苯酚 光降解 猝灭法 荧光法 

分 类 号：X703[环境科学与工程—环境工程]