作　　者： ; ; ; ; ; ; ;

机构地区： 海南师范大学化学与化工学院

出　　处： 《化学学报》 2009年第23期2650-2654,共5页

摘　　要： 以Keggin型铁取代杂多阴离子PW11O39Fe(Ⅲ)(H2O)4-(PW11Fe)代替传统电芬顿(electro-Fenton)方法中的Fe3+作为电催化剂,构成一个新颖的电催化体系并用于中性水溶液中硝基苯的降解.结果表明,含有1.0mmol·L-1硝基苯和1.0mmol·L-1PW11Fe的混合磷酸盐溶液(pH6.86),在-0.5V电位和60mL·min-1O2流速下反应100min,硝基苯便完全降解.降解的准一级表观速率常数与硝基苯的初始浓度有关,当硝基苯的初始浓度为1.0,2.0和5.0mmol·L-1时,kobs分别为7.18×10-2,3.57×10-2和1.47×10-2min-1.降解反应100min的TOC(有机碳总量)去除率约为35%,表明硝基苯的降解过程伴随着矿化. A novel system constituted by Keggin-type iron-substituted heteropolytungstate anion PW11O39Fe（Ⅲ）（H2O）^4- [PW11Fe] was applied to degrade nitrobenzene （NB） in a neutral aqueous solution. Experimental results showed that a complete NB degradation was obtained in less than 100 min in a pH 6.86 mixed phosphate solution containing 1.0 mmol· L^-1 NB and 1.0 mmol· L^-1 PW11Fe at the potential of -0.5 V and 60 mL· min^-1 O2 flow rate. The observed quasi-first order rate constant kobs of NB degradation related with NB initial concentration, which was determined to be 7.18 × 10^-2, 3.57 ×10^-2 and 1.47 ×10^-2 min^-1 at the initial concentration of 1.0, 2.0 and 5.0 mmol·L^-1, respectively. Ca. 35% TOC （total organic carbon） removal obtained at 100min reaction time indicated that the process of NB degradation was accompanied by partial mineralization.

关 键 词： 铁取代杂多阴离子 电催化 硝基苯降解 矿化率

领　　域： [化学工程] [环境科学与工程]