ZnCl_(2)-LiCl改性淀粉生物炭对水体中四环素的吸附性能研究  

Adsorption of Tetracycline in Water by ZnCl_(2)-LiCl Modified Starch Biochar

作　　者：黄冰媛 黄丹 郑茜 高和军[1] 廖运文[1] HUANG Bing-yuan;HUANG Dan;ZHENG Qian;GAO He-jun;LIAO Yun-wen(College of Chemistry and Chemical Engineering,China West Normal University,Nanchong Sichuan 637009,China;People's Hospital of Gaoping District,Nanchong Sichuan 637199,China)

机构地区：[1]西华师范大学化学化工学院,四川南充637009 [2]南充市高坪区人民医院,四川南充637199

出　　处：《西华师范大学学报（自然科学版）》2023年第6期596-604,共9页Journal of China West Normal University(Natural Sciences)

基　　金：四川省自然科学基金项目(2022NSFSC0350);南充市应用基础项目(21YFZJ0109)。

摘　　要：利用ZnCl_(2)-LiCl混合熔融盐改性淀粉生物质,采用高温热解法成功制备出一种分级多孔碳材料BCZL,用于吸附水溶液中的四环素。利用扫描电子显微镜、比表面积及孔径分析仪、拉曼光谱仪和X射线衍射仪对材料的结构进行表征,考察了溶液初始pH、吸附时间、四环素初始浓度和共存离子对BCZL吸附四环素的影响。表征结果表明:改性后的生物炭材料具有多孔结构和石墨结构,比表面积高达1854 m^(2)·g^(-1)。批量吸附实验结果表明:该吸附剂在pH=4、温度为30℃、接触时间为5 h时对四环素具有1303 mg·g^(-1)的高吸附容量。吸附动力学表明:该吸附过程涉及化学吸附。吸附等温线表明:该吸附过程是发生在不均匀表面的多层吸附。BCZL对四环素的选择性效果好,循环性能优异。吸附机理涉及孔隙填充、静电吸引、π-π相互作用和氢键作用。In this paper,ZnCl_(2)-LiCl modified starch biomass is utilized for successfully preparing a hierarchical porous carbon material BCZL by high-temperature pyrolysis to adsorb the tetracycline in aqueous solution.The material structure is characterized by scanning electron microscopy,specific surface area,pore size analyzer,Raman spectroscopy,X-ray diffraction,and the effects of initial pH,adsorption time,initial concentration of tetracycline,and coexisting ions on the adsorption of tetracycline by BCZL are investigated.The characterization results show that the modified biochar material has a porous and graphitic structure and its specific surface area is as high as 1854 m^(2)·g^(-1).The results of batch adsorption experiments show that the adsorbent has a high adsorption capacity of 1303 mg·g^(-1) for tetracycline at pH=4,temperature of 30℃ and contact time of 5 h.The adsorption kinetics indicates that the adsorption process involves chemisorption,and the adsorption isotherms reveal that the adsorption process is multilayer adsorption occurring on inhomogeneous surfaces.BCZL has exhibited good selective effect on TC and excellent cycling performance.The adsorption mechanism has involved pore filling,electrostatic attraction,π-π interaction,and hydrogen bonding.

关 键 词：ZnCl_(2) LICL 淀粉 吸附 四环素 

分 类 号：O69[理学—化学]