氮掺杂生物炭负载CuS活化过硫酸盐去除橙黄G  

Removal of Orange G by nitrogen-doped biochar loaded with CuS activated persulfate

作　　者：陈思良 孙雯[1,2] 洪耀良 CHEN Si-liang;SUN Wen;HONG Yao-liang(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;Jiangsu Collaborative Innovation Center of Water Treatment Technology and Materials,Suzhou 215009,China;Jiangsu Separation and Purification Materials and Technology Engineering Research Center,Suzhou 215009,China)

机构地区：[1]苏州科技大学环境科学与工程学院,江苏苏州215009 [2]江苏省水处理技术与材料协同创新中心,江苏苏州215009 [3]江苏省分离净化材料与技术工程研究中心,江苏苏州215009

出　　处：《中国环境科学》2024年第5期2483-2494,共12页China Environmental Science

基　　金：国家自然科学基金资助项目(51908394)。

摘　　要：以小麦秸秆和尿素为原料,通过热解-共沉淀法制备氮掺杂生物炭负载CuS的复合材料(CuS@NBC),采用X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FT-IR)、扫描电子显微镜(SEM)、全自动比表面及孔隙率分析仪(BET)等手段对CuS@NBC的理化性质进行分析,并将其用于活化过二硫酸盐(PDS)以降解水中的偶氮染料橙黄G(OG),探究PDS浓度、CuS@NBC浓度和初始pH值等反应条件对OG去除效果的影响,以及CuS@NBC的循环利用性能.结果表明,在OG浓度为50mg/L,CuS@NBC浓度为0.2g/L,PDS浓度为4mmol/L时,OG的去除率和矿化率分别为99.16%和36.79%;在初始pH值为5~9范围内OG具有良好的去除效果;CuS@NBC在循环使用5次后,OG的去除率仍有75.92%.通过自由基淬灭实验和电子顺磁共振(EPR)光谱测试结果表明CuS@NBC/PDS体系中主要活性氧为O_(2)·^(-)和^(1)O_(2).X射线光电子能谱仪(XPS)分析结果表明,CuS@NBC表面的Cu^(+)、C=O、-COOH和石墨氮是活化PDS的主要活性位点.离子共存实验表明,Cl^(-)对OG的去除具有促进作用,NO_(3)^(-)对OG的去除几乎没有影响,而HCO_(3)^(-)和HA对OG的去除具有显著的抑制作用.此外,结合实验结果提出CuS@NBC/PDS体系可能的活化机制.In the present study,a composite material of nitrogen-doped biochar loaded with copper sulfide(CuS@NBC)was synthesized using wheat straw and urea via a pyrolysis-coprecipitation method.The physicochemical properties of CuS@NBC were analyzed via X-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),and Brunauer-Emmett-Teller(BET)surface area and porosity analysis.The prepared CuS@NBC was used for activating peroxydisulfate(PDS)to degrade the azo dye Orange G(OG).This study investigated the effect of various parameters,including PDS concentration,CuS@NBC concentration,and initial pH,on OG removal efficacy,as well as the recycling performance of [e-mail] results showed that at an OG concentration of 50mg/L,a CuS@NBC concentration of 0.2g/L,and a PDS concentration of 4mmol/L resulted in the OG removal and mineralization rates of 99.16%and 36.79%,respectively.Effective OG removal was observed within a pH range of 5~9.CuS@NBC maintained an OG removal rate of 75.92%even after five reuse cycles.Electron paramagnetic resonance spectroscopy and free-radical quenching experiments indicated that O_(2)·^(-)and ^(1)O_(2) were the primary active oxygen species in the CuS@NBC/PDS system.X-ray photoelectron spectroscopy(XPS)analysis revealed that Cu^(+),C=O,-COOH,and graphitic nitrogen on the surface of CuS@NBC were the main active sites for PDS activation.Ion coexistence experiments demonstrated that OG removal was enhanced by Cl^(-),while NO_(3)^(-)had almost no effect on it and HCO_(3)^(-)and Humic acid(HA)considerably inhibited it.In addition,based on experimental results,a potential activation mechanism for the CuS@NBC/PDS system was proposed.

关 键 词：生物炭 氮掺杂 CUS 橙黄G 过二硫酸盐 

分 类 号：X703.5[环境科学与工程—环境工程]