等离子体改性海绵铁活化过硫酸盐处理含酚废水

Treatment of phenol wastewater with persulfate activated by plasmamodified sponge iron

采用低温等离子体技术对海绵铁表面进行改性,并将其用于活化过硫酸盐(PS)处理含酚废水。通过氮气等温吸附(BET)、X射线衍射(X RD)和扫描电子显微镜(SEM)等手段对改性前后的海绵铁进行表征分析。以苯酚为目标污染物,通过静态实验考察催化剂投加量、催化剂/PS摩尔比、pH和苯酚初始浓度对等离子体改性海绵铁活化PS处理含酚废水的影响。结果表明,改性后的海绵铁比表面积、孔容及孔径均有增大,活化PS能力显著提高;在最佳反应条件(等离子改性海绵铁的投加量为0.4g/L,催化剂/PS摩尔比为1∶15,溶液pH为2,苯酚的初始浓度为250mg/L)下,苯酚的去除率可达95%;反应过程符合二级反应动力学,主要是硫酸根自由基和羟基自由基起氧化作用。等离子体技术改性海绵铁活化过硫酸钠可有效去除水中苯酚,为实际含酚废水的处理提供一些思路。

Sponge iron modified by low temperature plasma technology was used to activate persulfate(PS)for phenol wastewater treatment.The pre and post-modification materials were characterized by Brunauer-Emmett-Teller(BET),X-ray diffraction(XRD)and scanning electron microscopy(SEM).Phenol was the target pollutant.The effects of catalyst dosage,catalyst/PS molar ratio,pH and initial concentration of phenol on plasma-modified sponge iron activated PS treatment of phenol-containing wastewater were investigated by static experiments.The results showed that the modified sponge iron had a larger specific surface area,pore volume and pore size,so the activation ability of PS was significantly improved.Under the optimal reaction conditions(the dosage of plasma-modified sponge iron is 0.4g/L,catalyst/PS molar ratio is 1∶15,the solution pH is 2 and the initial concentration of phenol is 250mg/L),the removal rate of phenol was 95%.The reaction process conformed to the second-order reaction kinetics,which mainly due to the oxidation of sulfate radicals and hydroxyl radicals.The persulfate activated by plasma modified sponge iron can effectively treat phenol wastewater,which provides some new solutions for phenol wastewater treatment.