紫外光下施氏矿物活化过硫酸盐降解罗丹明B  

Degradation of Rhodamine B by schwertmanniteactivated persulfate under UV light

作　　者：刘慧 周佳兴 任鹏飞 张健[1] 秦俊梅[1] 毕文龙 倪月 刘奋武[1] LIU Hui;ZHOU Jiaxing;REN Pengfei;ZHANG Jian;QIN Junmei;BI Wenlong;NI Yue;LIU Fenwu(College of Resources and Environment,Shanxi Agricultural University,Jinzhong 030800,China)

机构地区：[1]山西农业大学资源环境学院,山西晋中030800

出　　处：《工业水处理》2022年第5期110-116,共7页Industrial Water Treatment

基　　金：山西省重点研发计划项目(201803D221002-2,201903D221015);山西省应用基础研究计划项目(201901D211353,201901D211385,20210302124073)

摘　　要：生物合成施氏矿物(Sch)经紫外光催化后可更好地活化过硫酸盐(PS)降解有机污染物质。以罗丹明B(RhB)为目标污染物,采用响应曲面法确定紫外光(UV)下Sch和PS的最佳投加量,并探究了UV/Sch/PS体系中自由基贡献及不同浓度阴离子对RhB降解的影响。结果表明,当RhB浓度为0.01 mmol/L,PS浓度为0.5 mmol/L,Sch质量浓度为0.5 g/L时,在紫外光照射45 min后RhB的降解率可达到93.7%。在UV/Sch/PS体系中,羟基自由基(·OH)是主要的活性自由基,其贡献率为40.6%,而硫酸根自由基(SO_(4)^(·-))的贡献率仅为12.7%。此外,NO_(3)^(-)、HCO_(3)^(-)、CO_(3)^(2-)和低浓度的Cl-加入对RhB的降解均无显著影响,高浓度的Cl^(-)会对RhB的降解产生轻微抑制作用,而H_(2)PO_(4)^(-)的浓度越高则对RhB的降解抑制作用越明显。UV-catalyzed biosynthesis of schwertmannite(Sch)can effectively activate persulfate(PS)to degrade or⁃ganic pollutants.Rhodamine B(RhB)was used as the target contaminant,and response surface methodology was used to determine the optimal dosage of Sch and PS under ultraviolet(UV)light,and the effect of free radical contri⁃bution and different concentrations of anions on the degradation of RhB in UV/Sch/PS system was also investigated.The results showed that when RhB was 0.01 mmol/L,PS was 0.5 mmol/L and Sch was 0.5 g/L,the degradation rate of RhB could reach 93.7%after 45 min of UV light irradiation.In UV/Sch/PS system,Hydroxyl radical(·OH)was the main active radical,its contribution rate was 40.6%,while the contribution rate of sulfate radical(SO_(4)^(·-))was only 12.7%.In addition,the addition of NO_(3)^(-),HCO_(3)^(-),CO_(3)^(2-) and low concentration of Cl-had no significant effect on the degradation of RhB in UV/Sch/PS system,while high concentrations of Cl^(-) slightly inhibited the degradation of RhB.However,the higher the concentration of H_(2)PO_(4)^(-),the more obvious the inhibitory effect.

关 键 词：施氏矿物 过硫酸盐 罗丹明B 高级氧化 

分 类 号：X703.1[环境科学与工程—环境工程]