新颖的PW_(11)O_(39)Fe(Ⅲ)(H_2O)^(4-)/H_2O_2类光-芬顿体系光催化降解苯胺

Photocatalytic Degradation of Aniline by a Novel Photo-Fenton-Like System Consisting of PW_(11)O_(39) Fe(Ⅲ)(H_2 O)^(4-)/H_2 O_2

将Keggin型铁取代杂多阴离子PW11O39Fe(Ⅲ)(H2O)4-[PW11Fe(Ⅲ)(H2O)]构成的类光-芬顿体系用于水体生物难降解有机污染物苯胺(ArNH2)的降解。研究了在紫外光照射和H2O2存在下,PW11Fe(Ⅲ)(H2O)对ArNH2降解的均相光催化作用。考察了ArNH2、H2O2和PW11Fe(Ⅲ)(H2O)浓度对光催化降解反应速率的影响。实验结果表明,0.1 mmol/L PW11Fe(Ⅲ)(H2O)+0.2 mmol/L H2O2+0.1 mmol/L ArNH2的中性溶液在300 W汞灯照射下反应60 min,ArNH2的降解率达100%,总有机碳(TOC)去除约52%。同时讨论了PW11Fe(Ⅲ)(H2O)光催化H2O2产生羟基自由基的分子机制,并比较了酸性和中性条件下苯胺的光催化降解效果。

A novel photo-Fenton-like system consisting of PWH O39Fe（Ⅲ） （H2 O）4- [PW11Fe（m） （H20） ] was applied to degrade the aqueous bio-refractory organic pollutant aniline （ArNH2 ）. The homogeneous photo-catalysis of PW11 Fe（ Ⅲ ） （H20） for ArNH2 d in the presence of hydrogen peroxide（ H2O2 ） （ H2O ） concentration on the photo-catalytic egradation was studied in detail under an artificial UV irradiation , in which the effects of initial ArNH2, H2O2 and PW11 Fe（Ⅲ） rate of ArNH2 degradation were examined. The experimental results show that a complete ArNH2 degradation was obtained in less than 60 min in a pH = 6. 86 mixed phosphate solution containing 0. 1 mmol/L PWH Fe （Ⅲ ） （ H2 O） ＋ 0. 2 mmol/L H2O2 ＋ 0. 1 mmol/L ArNH2 under a 300 W Hg lamp irradiation, and a total organic carbon（TOC） removal of ca. 52% was achieved. A mechanism of photocatalytic decomposition of H2O2 to hydroxyl radicals by PW, Fe （Ⅲ） （H2O） was proposed and a comparison of ArNH2 photo-catalytic degradation in acidic and neutral solutions was discussed.