超声强化海绵铁催化过硫酸钾降解磺胺嘧啶研究  

Sulfadiazine degradation in ultrasonic enhanced sponge iron/potassium persulfate system

作　　者：李文英[1] 魏红[1] 张佳桐 杨小雨[1] LI Wenying;WEI Hong;ZHANG Jiatong;YANG Xiaoyu(State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of Chian, Xi’an University of Technology,Xi’an 710048, China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利工程国家重点实验室

出　　处：《西安理工大学学报》2019年第3期314-319,360,共7页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(51979223);陕西省自然科学基金资助项目(2017JM5082);陕西省水利科技资助项目(2013slkj-07)

摘　　要：本文研究了超声强化对海绵铁催化过硫酸钾(Ultrasound/Sponge Iron/ Potassium Persulfate, US/SI/PS)降解磺胺嘧啶的效果,考察了过硫酸钾和海绵铁添加量,磺胺嘧啶(Sulfadiazine,SD)浓度、初始pH、温度等因素的影响。结果表明,磺胺嘧啶浓度15 mg/L,溶液温度25 ℃,超声功率56 W,初始pH=9.0±0.1,过硫酸钾和海绵铁添加量分别为0.4 g/L和0.6 g/L,磺胺嘧啶30 min的降解率达到93.3%。US/SI/PS降解磺胺嘧啶的过程符合准一级反应动力学。US/SI/PS体系降解磺胺嘧啶为硫酸根自由基(SO4 ^-·)和羟基自由基(HO·)的联合作用。海绵铁的重复性结果表明,使用三次后,磺胺嘧啶30 min的去除率仍保持在93 %以上,XRD分析说明海绵铁表面产生的Fe 2+氧化物一定程度上保持了海绵铁的催化能力。The degradation of sulfadiazine (SD) in the ultrasound/sponge iron/potassium persulfate(US/SI/PS) system was studied. The influencing factors such as adding amount of potassium persulfate and sponge iron, sulfadiazine concentration, initial pH value and temperature were investigated. Results showed that the sulfadiazine degradation rate achieved 93.3 % in 30 min under the experimental conditions of 15 mg/L sulfadiazine, 25 ℃,ultrasonic power 56 W, initial pH value of 9.0±0.1, potassium persulfate and sponge iron adding amount of 0.4 g/L and 0.6 g/L, respectively. Sulfadiazine degradation in the US/SI/PS system followed pseudo-first order kinetics, with the oxidation of sulfate and hydroxyl radicals contributed to SD degradation. The replication experiment indicated that sulfadiazine degradation rate in 30 min still remained 93 % even if sponge iron was used three times. XRD analysis showed that the ferrous oxide produced on sponge iron surface maintained the catalytic activity of sponge iron to a certain extent.

关 键 词：超声 海绵铁 过硫酸钾 磺胺嘧啶 

分 类 号：X703[环境科学与工程—环境工程]