锌硫功能生物炭活化过二硫酸盐降解亚甲基蓝  

Degradation of methylene blue using peroxydisulfate activated by zinc and sulfur functional biochar

作　　者：覃毅雪 王盛 张兵兵 陈蔚洁 安明泽 杨照[2] 秦舒浩[1,2] QIN Yixue;WANG Sheng;ZHANG Bingbing;CHEN Weijie;AN Mingze;YANG Zhao;QIN Shuhao(College of Materials and Metallurgy,Guizhou University,Guiyang 550025,China;National Engineering Research Center for Compounding and Modification of Polymer Materials,Guiyang 550014,China;Resources and Environmental Engineering Department,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025 [2]国家复合改性聚合物材料工程技术研究中心,贵州贵阳550014 [3]贵州大学资源与环境学院,贵州贵阳550025

出　　处：《工业水处理》2024年第11期82-92,共11页Industrial Water Treatment

基　　金：贵州省科技支撑计划项目(黔科合基础-ZK[2023]一般158,黔科合支撑[2022]一般219,黔科合服企[2021]9号);贵州省黔东南州科技支撑计划项目(黔东南科合J字[2022]59,剑科特派合[2022]10号,黔科合中引地[2023]035)。

摘　　要：以入侵物种水葫芦为原料,七水硫酸锌(ZnSO_(4)·7H_(2)O)溶液作为培养基,采用简单环保的植物富集法结合一步热解法制备了锌(Zn)硫(S)功能生物炭(Zn/S-BC),并利用SEM、BET、FT-IR、XRD和XPS等对其形貌和结构等进行了表征。以亚甲基蓝(MB)为主要污染物,考察了不同体系、Zn/S-BC投加量、过二硫酸盐(PDS)投加量、初始p H、共存阴离子和不同质量浓度MB等对Zn/S-BC活化PDS降解MB的影响,并探索了体系降解MB起主导作用的活性物种。实验结果表明:在溶液初始p H为7.08、Zn/S-BC投加量为0.2 g/L、PDS投加量为0.3 mmol/L、MB初始质量浓度为50 mg/L和反应温度为25℃条件下,体系对MB的降解率达98.7%,Zn/S-BC-PDS体系对高质量浓度MB(100、500、1 000 mg/L)及甲基橙(MO)和四环素(TC)也有很好的降解效果。在MB降解过程中硫酸盐自由基(SO_(4)^(·-))、羟基自由基(·OH)和单线态氧(^(1)O_(2))是参与MB降解的主要活性物质,催化剂表面的含氧官能团C—O、吡啶氮、石墨氮和噻吩硫等也会参与对MB的降解。Zn/S-BC-PDS体系具有很好的抗干扰性和稳定性。该研究为绿色高效催化剂的制备及其催化PDS降解有机污染物提供了参考。Zinc(Zn)and sulfur(S)functional biochar(Zn/S-BC)was prepared by simple and environmental friendly plant enrichment method combined with one-step pyrolysis method using invasive species water hyacinth as raw material and zinc sulfate heptahydrate(ZnSO_(4)·7H_(2)O)solution as culture medium.The morphology and structure of Zn/S-BC were characterized by SEM,BET,FT-IR,XRD,and XPS.Taking methylene blue(MB)as the main pollut⁃ant,the effects of different systems,Zn/S-BC dosage,PDS dosage,initial pH,coexisting inorganic anions and differ⁃ent mass concentrations of MB on the degradation of MB by Zn/S-BC activated peroxydisulfate(PDS)were investi⁃gated,and the dominant active substances playing a leading role in the degradation of MB in the system were ex⁃plored.The experimental results showed that the degradation rate of MB in the system was 98.7%at the condition of initial pH of 7.08,0.2 g/L Zn/S-BC,0.3 mmol/L PDS,50 mg/L MB and 25℃.The Zn/S-BC-PDS system also showed good degradation effects on high mass concentrations of MB(100,500,1000 mg/L),methyl orange(MO)and tetracycline(TC).Sulfate radicals(SO_(4)^(·-)),hydroxyl radicals(·OH)and singlet oxygen(^(1)O_(2))were the dominant active substances in the MB degradation process.In addition,the oxygen-containing functional groups C—O,pyridine-N,graphite-N and thiophenic sulfur on the surface of the catalyst would also participate in the removal of MB.Zn/S-BC-PDS system had good anti-interference and stability.This study provided a reference for the prepara⁃tion of green and efficient catalysts and the catalytic degradation of organic pollutants by PDS.

关 键 词：植物富集法 锌硫功能生物炭 过二硫酸盐 催化氧化 亚甲基蓝 

分 类 号：X52[环境科学与工程—环境工程] X703