Preparation of TOCNF and magnetic carboxymethyl chitosan nanoparticles composite and adsorption properties of Pb2+

被引：0

作者：

Zhou L. ^{[1
]}

Li R. ^{[1
]}

Bian Y. ^{[1
]}

Chen S. ^{[1
]}

机构：

[1] College of Food Science and Technology, Shanghai Ocean University, Shanghai

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 02期

关键词：

Adsorption; Adsorption isotherm equation; Cellulose nanofibers; Kinetic equation; Magnetic carboxymethyl chitosan; TEMPO oxidation;

D O I：

10.16085/j.issn.1000-6613.2021-0637

中图分类号：

学科分类号：

摘要：

Lead pollution in water causes great harm to environment and human health. In this paper, TEMPO-oxidized cellulose nanofibers (TOCNF) were cross-linked with magnetic carboxymethyl chitosan nanoparticles (MCCN) to prepare an economically efficient and environmentally friendly material to adsorb Pb2+. The structure of TOCNF/MCCN and TOCNF were characterized. The effects of pH, initial concentration of Pb2+, contact time and temperature on the adsorption efficiency of Pb2+ were studied by single factor experiments. The adsorption effects of TOCNF/MCCN and TOCNF on Pb2+ were compared under the optimum reaction conditions. The results showed that Fe3O4 was successfully coated by carboxymethyl chitosan nanoparticles and cross-linked with TOCNF. The optimum reaction condition for Pb2+ adsorption was obtained at room temperature when the pH was 5, initial concentration of Pb2+ was 100mg/L, and contact time was 240min. The absorption saturation capacity of TOCNF/MCCN was 193.5mg/g, which was nearly double that of TOCNF. Moreover, the adsorption process followed the pseudo-second-order model, which indicated that the adsorption rate was mainly determined by chemical adsorption. The correlation coefficient showed that the adsorption equilibrium data fitted well with Langmuir isotherm model, indicating that the adsorption of Pb2+ by TOCNF/MCCN was mainly the monolayer adsorption of surface groups. The theoretical saturated adsorption amount calculated by the slope of the linear equation was 201.1mg/g, which was 3.8% different from the actual value. After 5 times of desorption and re-adsorption, the adsorption efficiency of the adsorbent only decreased by 13%, which indicated that the adsorbent had good reproducibility and had a good application prospect. © 2022, Chemical Industry Press Co., Ltd. All right reserved.

引用

页码：901 / 910

页数：9

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