氮掺杂生物炭活化过硫酸盐去除罗丹明B  

Removal of Rhodamine B by Persulfate Activated with N-Doped Biochar

作　　者：王宇航 邓德明[1] WANG Yuhang;DENG Deming(School of Resource and Environmental Sciences,Wuhan University,Wuhan 430072,Hubei,China)

机构地区：[1]武汉大学资源与环境科学学院,湖北武汉430072

出　　处：《武汉大学学报（理学版）》2022年第2期137-145,共9页Journal of Wuhan University:Natural Science Edition

基　　金：武汉市科技攻关计划资助项目(201260723227)。

摘　　要：以椰壳生物质为碳源、尿素和烟酰胺为氮源,采用浸渍-热解法制备了氮掺杂生物炭(NBC),并以该碳材料作为过硫酸盐(PS)去除罗丹明B(RhB)的活化剂。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)等技术对材料的结构、形貌及组成进行表征,并考察了材料的催化性能以及去除RhB的机理。结果表明,NBC石墨化程度不高,为多孔的无定形碳结构,氮掺杂(掺杂量为1.45%)后材料表面活性含氧官能团增加;NBC在酸性和中性条件下具有良好的催化活性,NBC/PS体系降解RhB的活性物质为硫酸根自由基(SO_(4)^(−•))、羟基自由基(·OH)和单线态氧(^(1)O_(2));且NBC/PS体系能在湖水中有效去除RhB,但由于材料表面活性位点的消耗,NBC重复使用性较差。Nitrogen doped biochar(NBC)synthesized by impregnation-pyrolysis method with coconut shell biomass as carbon source,nicotinamide and urea as nitrogen source,was used for activating persulfate(PS)to remove Rhodamine B(RhB).The structure,morphology and composition of the materials were characterized by the methods of X-ray diffraction(XRD),scanning electron microscope(SEM),and X-ray photoelectron spectroscopy(XPS).Then,the catalytic properties of NBC were investigated,the removal mechanism of RhB was explored too.The results indicate that NBC exhibits a porous structure with a low graphitization,and the active oxygencontaining functional groups increase in surface after being doped by N(1.45%).NBC shows good catalytic activity under acidic and neutral conditions.The active species for RhB degradation includes sulfate radical(SO_(4)^(−•)),hydroxyl radical(·OH)and singlet oxygen(1 O_(2)),and NBC/PS system also can effectively remove RhB in lake water.Unfortunately,the reusability of catalyst is poor owning to the consumption of the carbon surface active sites.

关 键 词：生物炭改性 氮掺杂 过硫酸盐 硫酸根自由基 单线态氧 罗丹明B 

分 类 号：X522[环境科学与工程—环境工程]