载锆玉米秸秆生物炭的结构表征及磷吸附效果  

Structural Characterization and Phosphorus Adsorption of Zirconium-Loaded Corn Stalk Biochar

作　　者：敖涵婷 曹威[1] 阚晋[1] 邓彩军 魏琳[1] AO Hanting;CAO Wei;KAN Jin;DENG Caijun;WEI Lin(College of Civil Engineering,Huaqiao University,Xiamen 361021,China)

机构地区：[1]华侨大学土木工程学院,福建厦门361021

出　　处：《华侨大学学报（自然科学版）》2018年第6期851-858,共8页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(51408239);福建省自然科学基金资助项目(2016J01193;2015J01015)

摘　　要：以玉米秸秆为原料,利用氧氯化锆浸渍-限氧热解法制备一种新型的载锆生物炭阴离子吸附剂.采用场发射扫描电镜(FE-SEM)、傅里叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)和比表面积测定(BETN2)等手段,对空白生物炭(BC)及载锆生物炭(Zr-BC)的形貌、组成及结构进行表征.结果表明:热解后的生物炭表面形貌粗糙,均发育有裂纹和蜂窝状大孔结构;与BC相比,Zr-BC比表面积和平均孔径都有降低,且表面元素含C量大幅降低,含O量显著增加,Zr质量分数达到15.7%;Zr-BC表面主要官能团有羟基(-OH)、羧基(-COOH)、锆羟基氧化物等,构成吸附性能的结构基础;当pH值为2时,Zr-BC对磷酸盐吸附效果最显著,符合Freundlich等温吸附线模型.通过多种阴离子混合吸附测试发现,Zr-BC对水中磷酸盐有较高吸附量,且选择性较高.A novel anion adsorbent,zirconium impregnated biochar(Zr BC),was prepared from corn stalk by using zirconium oxychloride impregnation limited oxygen pyrolysis method.Field emission scanning electron microscopy(FE SEM),Fourier transform infrared spectroscopy(FT IR),X ray photoelectron spectroscopy(XPS),and BET N 2 specific surface were employed to characterize the surface morphology,element composition and structure of the zirconium impregnated biochar(Zr BC)and the blank biochar(BC).The results showed that Zr BC had rough surface with plenty of cracks and macropore structure,and its specific surface area and medium pore size were both decreased in contrast to BC.Moreover,Zr BC surface contained much more O and less C element than that of BC,and Zr content reached 15.7%.Major surface functional groups of Zr BC included hydroxyl(-OH),carboxyl(-COOH),and particularly zirconium oxyhydroxide,underlying the structural basis for anion adsorption.The adsorption of phosphate by Zr BC was highly dependent on pH value,and the optimum pH value was 2.The equilibrium isotherm data of phosphate on Zr BC were well fitted to the Freundlich isotherm models.Adsorption experiments with mixed anions solution showed that Zr BC had a higher adsorption capacity for phosphate and exhibited high selectivity.

关 键 词：玉米秸秆 生物炭 锆氧化物 结构表征 磷酸盐吸附 

分 类 号：X524[环境科学与工程—环境工程]