ZVI/Cu双金属活化过硫酸钠降解甲基橙及影响因素的研究

Degradation of methyl orange by sodium persulfate activated by ZVI/Cu bimetal and its influencing factors

为研究ZVI/Cu(铁/铜)双金属体系的降解能力,制备了不同理论Cu质量载荷(0.05、0.11、0.24、0.41和1.26 g Cu/g ZVI)的ZVI/Cu双金属颗粒。利用制备所得的ZVI/Cu双金属颗粒活化过硫酸钠(PDS)产生的硫酸根自由基(SO^-4·)作为氧化剂降解偶氮染料甲基橙(MO)。研究了不同因素对目标产物降解效率的影响,包括有Cu质量载荷、ZVI/Cu双金属颗粒的加入量、过硫酸钠的浓度、pH值、温度。实验结果表明ZVI/Cu双金属相对于单纯的Cu和ZVI具有更加优异的催化降解能力,因此可以得出结论在零价铁上沉积一层过渡金属Cu可以有效提高活化能力,以达到提升降解能力的效果;在MO初始浓度为50 mg/L、PDS加入量为5.0 mmol/L、ZVI/Cu双金属颗粒加入量为0.15 g/L、初始pH值为4.0、温度为30℃的条件下,反应进行60 min MO降解率达到86.4%。

To study the degradation capacity of ZVI/Cu(iron/copper)bimetallic system,ZVI/Cu bimetallic particles with different theoretical Cu mass loads(0.05,0.11,0.24,0.41 and 1.26 g Cu/g ZVI)were prepared.The ZVI/Cu bimetallic particles were used to activate the sulfate radical(SO^-4·)generated by sodium persulfate(PDS)as oxidant to degrade the azo dye methyl orange(MO).The effects of different factors on degradation efficiency of target products were studied,including Cu mass loading,ZVI/Cu bimetallic particle addition,sodium persulfate concentration,pH value and temperature.The experimental results show that ZVI/Cu bimetal had better catalytic degradation ability than Cu and ZVI alone.Therefore,it could be concluded that depositing a layer of transition metal Cu on zero-valent iron could effectively improve the activation ability,so as to improve the degradation ability.Under the conditions of initial MO concentration of 50 mg/L,PDS addition of 5.0 mmol/L,ZVI/Cu addition of 0.15 g/L,initial pH value of 4.0,and temperature of 30℃,the MO degradation rate of the reaction for 60 min reached 86.4%.