一个新颖的类光芬顿体系光催化降解DMP(英文)

Photocatalytic Degradation of DMP Using a Novel Photo-Fenton-Like System

一个以Keggin型铁取代杂多阴离子PW11O39Fe(Ⅲ)(H2O)4-[PW11Fe(III)(H2O)]为光催化剂的新颖类光芬顿体系被用于邻苯二甲酸二甲酯(DMP)的光催化降解.实验结果表明,在pH6.86的含有0.1 mmol.L-1DMP+1.0 mmol.L-1PW11Fe(Ⅲ)(H2O)+3.0 mmol.L-1H2O2.磷酸盐缓冲溶液中,反应80 minDMP的降解率达到100%,总有机碳去除率为43%,并详细考察了溶液pH、初始过氧化氢浓度和PW11Fe(Ⅲ)(H2O)浓度对降解效率的影响.提出了过氧化氢存在和缺失条件下的光催化机制,这个新颖的类光芬顿体系为实际的水处理提供了潜在的应用.

A novel photo-Fenton-like （PFL） system using a Keggin-type iron-substituted heteropolyanion PW11039Fe（Ⅲ）（H2O）^4-[PW11Fe（Ⅲ）（H20）] as photocatalyst was employed to the photocatalytic degradation of dimethylphthalate （DMP）. The experimental results showed that a complete DMP degradation and a 43% total organic carbon （TOC） removal was obtained in less than 80 min in a pH 6.86 mixed phosphate buffer solution containing 0.1 mmol·L^-1 DMP ＋ 1.0 mmol·L^-1 PWllFe（Ⅲ） （H2O） ＋3.0 mmol. L-j H2O2. Effects of solution pH, initial H2O2 and PW11Fe （Ⅲ） （H2O） concentration on the rate of DMP degradation were also examined, respectively. Mechanisms of photo-catalysis in the absence of H2O2 and in the presence of H2O2 were simultaneously proposed. The PFL system provides a potential application in practical treatment of wastewater with a relaxed pH requirement.