Preparation of magnetic DTPA-modified chitosan composite microspheres for enhanced adsorption of Pb(II) from aqueous solution

被引：21
作者：
Liu, Xueling [1 ]
Wang, Yajing [2 ]
Wu, Xiaofen [1 ]
Wang, Yi [1 ]
Fan, Guozhi [1 ]
Huang, Yanjun [1 ]
Zhang, Lei [1 ]
机构：
[1] Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Peoples R China
[2] Hubei Prov Acad Ecoenvironm Sci, Wuhan 430072, Peoples R China
来源：
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES | 2024年 / 264卷
关键词：
DTPA-modified chitosan; Microsphere; Adsorption; CROSS-LINKED-CHITOSAN; EFFICIENT REMOVAL; COPPER ADSORPTION; CU(II) IONS; WASTE-WATER; NI(II) IONS; EDTA; LINKING; ADSORBENT; LEAD;
D O I：
10.1016/j.ijbiomac.2024.130410
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
In this study, magnetic DTPA-modified chitosan composite microspheres (MDCM) were prepared by reverse emulsion-double crosslinking method (carbodiimide followed by glutaraldehyde) for removal of Pb(II) from aqueous solution. The obtained magnetic adsorbents were characterized by FTIR, SEM, XRD, VSM, BET, and 13C NMR. The effects of the pH, contact time, initial concentration, and competitive metal cations (Na(I), Ca(II), or Mg(II)) on Pb(II) adsorption were investigated. The results revealed that MDCM exhibited high removal performance over a wide pH range and in the presence of competitive metal cations. The maximum adsorption capacity of MDCM for Pb(II) is 214.63 mg g-1 at pH 3, which is higher than most recently reported magnetic adsorbents. Adsorption kinetics and isotherms can be described by the pseudo-second-order model and Langmuir model, respectively. In addition, MDCM is easy to regenerate and can be reused five cycles with high adsorption capacity. Finally, the adsorption mechanism was further revealed by FTIR and XPS analysis. Overall, MDCM has practical application potential in removing Pb(II) from contaminated wastewater due to its high adsorption efficiency, good reusability, and convenient magnetic separation.
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页数：12
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