氨基和羧基功能化磁性微球去除水溶液中Cd(Ⅱ)和Pb(Ⅱ)

硅酸盐通报 ›› 2017, Vol. 36 ›› Issue (12): 4302-4307.

氨基和羧基功能化磁性微球去除水溶液中Cd(Ⅱ)和Pb(Ⅱ)

赵凡;陈秀梅;张文刚;雒雪丽;李易轩;朱力;李忠宏

西北农林科技大学,食品科学与工程学院,杨凌 712100

出版日期:2017-12-15 发布日期:2021-01-18
基金资助:
国家自然科学基金(31371813)

Removal of Cd(Ⅱ) and Pb (Ⅱ) in Aqueous Solution by Amino and Carboxyl Functionalized Magnetic Microspheres

ZHAO Fan;CHEN Xiu-mei;ZHANG Wen-gang;LUO Xue-li;LI Yi-xuan;ZHU Li;LI Zhong-hong

Online:2017-12-15 Published:2021-01-18

摘要/Abstract

摘要： 以甲基丙烯酸和丙烯酰胺为功能单体,通过悬浮聚合法制备了氨基和羧基双功能化的磁性复合微球(Fe3 O4@SiO2-NH2/COOH),并探讨了其对水溶液中Cd(Ⅱ)和Pb(Ⅱ)的吸附性能.X-射线衍射(XRD)分析表明,制备的磁性吸附剂内核为Fe3 O4.红外光谱(FT-IR)和扫描电镜(SEM)测试表明,氨基和羧基对Fe3 O4@SiO2表面改性成功.吸附试验显示,Fe3O4@SiO2-NH2/COOH吸附Cd(Ⅱ)和Pb(Ⅱ)的最优pH值分别为5.0和5.5,吸附过程均符合动力学准二级模型和Langmuir吸附等温模型,吸附剂对Cd(Ⅱ)和Pb(Ⅱ)最大吸附量分别为207.807 mg/g和168.995 mg/g.实际饮用水样中Cd(Ⅱ)和Pb(Ⅱ)的吸附表明,去除率分别可达97.74％和91.44％.该磁性吸附剂对两种重金属离子吸附量大、去除率高,具有良好的实际应用潜力.

关键词: 磁性微球;氨基羧基改性;核壳结构;重金属;吸附

Abstract: The amino and carboxyl groups co-functionalized magnetic composite microspheres ( Fe3 O4@SiO2-NH2/COOH) were prepared using methacrylic acid and acrylamide as functional monomer via suspension polymerization method for removal of aquatic Cd ( Ⅱ ) and Pb ( Ⅱ ) ions.Fourier transform infrared spectroscopy (FT-IR) spectra and scanning electron microscopy (SEM) images showed that the amino and carboxyl groups were successfully modified onto Fe 3 O4@SiO2 microspheres .Adsorption tests revealed that the optimal adsorption pH of Fe 3 O4@SiO2-NH2/COOH for Cd ( Ⅱ ) and Pb ( Ⅱ ) were respectively 5.0 and 5.5.The adsorption data was both fitted well by pseudo second order model and Langmuir adsorption isotherm model .The calculated maximum adsorption capacity for Cd ( Ⅱ ) and Pb (Ⅱ) was 207.807 mg/g and 168.995 mg/g, respectively.Removal rates of 97.74％ and 91.44％ for Cd(Ⅱ) and Pb(Ⅱ) were achieved in real tap water samples.The as-prepared magnetic adsorbent with high adsorption capacity and high removal rate for the two heavy metal ions showed good application potential .

Key words: magnetic microsphere;amino carboxyl modification;core-shell structure;heavy metal;adsorption

中图分类号:

O647.33

赵凡;陈秀梅;张文刚;雒雪丽;李易轩;朱力;李忠宏. 氨基和羧基功能化磁性微球去除水溶液中Cd(Ⅱ)和Pb(Ⅱ)[J]. 硅酸盐通报, 2017, 36(12): 4302-4307.

ZHAO Fan;CHEN Xiu-mei;ZHANG Wen-gang;LUO Xue-li;LI Yi-xuan;ZHU Li;LI Zhong-hong. Removal of Cd(Ⅱ) and Pb (Ⅱ) in Aqueous Solution by Amino and Carboxyl Functionalized Magnetic Microspheres[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2017, 36(12): 4302-4307.