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.
引文
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