摘要
构建了Fe^(2+)/电复合活化过硫酸盐体系,以酸性橙Ⅱ为模拟污染物,探究了温度、Fe^(2+)浓度、过硫酸钠浓度、电流密度和pH值对降解过程的影响,并基于猝灭实验分析过程中存在的活性物种及其作用机制.结果表明:Fe^(2+)/电复合活化下酸性橙Ⅱ的降解速率远高于同等条件下单一Fe^(2+)活化或电活化的情况;Fe^(2+)/电复合活化的能耗仅为0.15 kWh·m^(-2),比电活化的能耗降低了46.4%;Fe^(2+)/电复合活化对初始pH的适用性较为宽泛,在酸性或中性条件下均可有效降解酸性Ⅱ;在温度为40℃、Fe^(2+)浓度为0.50 mmol·L^(-1)、过硫酸钠浓度为4 mmol·L^(-1)、电流密度为3 mA·cm^(-2)和初始pH为6.76的情况下,酸性橙Ⅱ的降解率可在30 min内达到95.8%;猝灭实验表明,复合活化过程中存在硫酸根自由基、羟基自由基和超氧自由基.综合分析认为复合体系中的Fe^(2+)和电场同步作用,促进了过硫酸盐的活化及降解过程.
In this study,the degradation of acid orange-Ⅱ by Fe^(2+)/electro synergistic activated persulfate system was investigated.The effects of temperature,Fe^(2+)dosage,sodium persulfate dosage,current density,and pH on the degradation process have been explored.The active species as well as their mechanism of action in the process has also been analyzed based on the quenching experiment.The result shows that the degradation rate of acid orange-II under Fe^(2+)/electro synergistic activation is much higher than that of single Fe^(2+)activation or electro-activation in the same conditions;the energy consumption of Fe^(2+)/electro synergistic activation is only 0.15 kWh·m^(-2),which is 46.4 % lower than that of electro-activation;Fe^(2+)/electro synergistic activation can be applied in a wide pH range,and the acid orange Ⅱ can be effectively degraded under neutral and acidic conditions;when the temperature is 40 ℃,Fe^(2+) dosage is 0.50 mmol·L^(-1),the dosage of sodium persulfate is 4 mmol·L^(-1),the current density is 3 mA·cm^(-2),and the initial pH is 6.76,the degradation rate of acid orange-Ⅱ can reach 95.8% within 30 minutes;the quenching experiment demonstrates that there are sulfate radicals,hydroxyl radicals and superoxide radicals in the synergistic activating process.In summary,the simultaneous effect of Fe^(2+) and electro field in the synergistic system promotes the activation of persulfate and degradation of acid orange-Ⅱ.
作者
张兆祥
黄智辉
纪志永
汪婧
郭小甫
刘杰
赵颖颖
李洪
袁俊生
ZHANG Zhaoxiang;HUANG Zhihui;JI Zhiyong;WANG Jing;GUO Xiaofu;LIU Jie;ZHAO Yingying;LI Hong;YUAN Junsheng(National-Local Joint Engineering Laboratory of Chemical Energy Saving Process Integration and Resource Utilization,School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130;Engineering Research Center of Seawater Utilization of Ministry of Education,School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130;Hebei Collaborative Innovation Center of Modern Marine Chemical Technology,Tianjin 300130)
出处
《环境科学学报》
CAS
CSCD
北大核心
2022年第4期113-121,共9页
Acta Scientiae Circumstantiae
基金
河北省重点研发计划项目(No.19274003D)
河北省自然科学基金项目(No.B2019202423)。
关键词
过硫酸盐
高级氧化
二价铁活化
酸性橙Ⅱ
复合活化
persulfate
advanced oxidation
ferrous activation
acid orangeⅡ
synergistic activation
