作　　者： ; ; ; ;

机构地区： 浙江大学机械与能源工程学院能源清洁利用国家重点实验室

出　　处： 《高电压技术》 2015年第2期491-497,共7页

摘　　要： 为探究等离子体-溶液系统联合零价铁(ZVI)Fenton反应对酸性橙Ⅱ(AOⅡ)的降解效果,考察ZVI对降解过程的促进作用及降解机理,建立了滑动弧等离子-溶液系统进行了实验研究。以质量浓度200 mg/L的AOⅡ为例,改变ZVI投加量分别为0、4、7、10、13 g。结果显示ZVI投加量为10 g时,AOⅡ的降解程度最高,为97.8%。等离子体-溶液系统中滑动弧放电产生的H2O2与加入的ZVI结合发生Fenton反应,AOⅡ降解过程遵守一级动力学规律。对比不加入ZVI时的AOⅡ反应速率常数,加入10 g ZVI后初始质量浓度为100、150、200、250、300 mg/L的AOⅡ反应速率常数分别提高了12.9%、31.0%、39.4%、44.3%、47.8%。溶液化学需氧量(COD)去除率也表明了在降解过程中加入ZVI能够有效地提高降解率。运用色谱-质谱联用仪(GC-MS)测定了AOⅡ的降解机理,认为*OH攻击AOⅡ分子上与萘环相连的—N N—键,导致—N N—键的断裂,并经过一系列的氧化过程后形成无机小分子物质。 To investigate the degradation effect of acid orangeⅡ（AOⅡ） using plasma-solution system combined with Fenton catalysis of zero-valentiron（ZVI）, and to obtain the effect of ZVI additive and the degradation mechanism, we conducted an experimental research with a homemade gliding arc discharge（GAD） plasma-solution system zero-valent iron. Taking AOⅡ solution of 200 mg/L as the object, we tested five dosages of ZVI, namely 0,4,7,10 and 13 g. The results show that among the tested dosages, the highest degradation rate of AOⅡ, 97.8%, was obtained with 10 g ZVI additive. During the discharge, hydrogen peroxide generated in the solution could react with ZVI and induce Fenton reaction, which was sustained by continuous ferrous ions from the corrosion of ZVI. The degradation reaction of AOⅡ follows the pseudo-first-order kinetics. Compared with the degradation of AOⅡ with no ZVI additive, 10 g ZVI input increased the reaction rate constants of AOⅡ in solutions with initial concentrations of 100, 150, 200, 250 and 300 mg/L by 12.9%, 31.0%, 39.4%, 44.3% and 47.8% respectively. The chemical oxygen demand removal efficiency of AOⅡ also confirmed the effectiveness of applying ZVI to increase the reaction rate constants. Moreover, we analyzed the degradation compounds through GC-MS analysis, and obtained that the dye molecule degradation was firstly initiated from the cleavage of —N= N— by hydrogen peroxide, and finally mineralized.

关 键 词： 等离子体 溶液系统 滑动弧 酸性橙 反应 降解率 降解途径

领　　域： [环境科学与工程]