Synthesis of polyethyleneimine modified CoFe2O4-loaded porous biochar for selective adsorption properties towards dyes and exploration of interaction mechanisms

被引：73

作者：

Wu, Zhengde ^{[1
]}

Wang, Ximo ^{[1
]}

Yao, Jing ^{[1
]}

Zhan, Siyan ^{[1
]}

Li, Hui ^{[1
]}

Zhang, Jian ^{[1
]}

Qiu, Zumin ^{[1
]}

机构：

[1] Nanchang Univ, Sch Resources Environm & Chem Engn, Key Lab Poyang Lake Environm & Resource Utilizat, Minist Educ, Nanchang 330031, Jiangxi, Peoples R China

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2021年 / 277卷

关键词：

Polyethyleneimine; Magnetic porous biochar; Dyes; High selectivity; Interaction mechanisms; CONGO RED; WASTE-WATER; HOLLOW MICROSPHERES; EFFICIENT REMOVAL; ACTIVATED CARBON; AQUEOUS-SOLUTION; GRAPHENE OXIDE; METHYL-ORANGE; HUMIC-ACID; COMPOSITE;

D O I：

10.1016/j.seppur.2021.119474

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

A novel adsorbent of polyethyleneimine modified magnetic porous biochar from waste bamboo powder was synthesized and applied to the selective removal of Congo red (CR) in wastewater. The adsorbents were characterized by multiple methods, and the adsorption properties of CR from single, binary and simulated textile wastewater were investigated. The kinetics showed that the adsorption process conformed to Elovich model and the rate-controlling step was determined by multiple stages. In addition, the adsorption isotherms indicated that CR adsorption was well fitted to Freundlich model, and thermodynamic parameters depicted the endothermic nature and the spontaneous process. The maximum adsorption capacity of the adsorbent was 435.9 mg/g, and adsorption amount reached 899.44 mg/g at pH = 3. The adsorption mechanism of CR involved electrostatic interaction and hydrogen bonding. Additionally, the influences of the presence of anionic methyl orange (MO) and cationic methylene blue (MB) on CR adsorption and the interaction mechanisms between the dyes manifested that the removal of CR slightly inhibited by MO while significantly promoted by MB was respectively due to the competition and synergy. Furthermore, the high efficiency of the novel adsorbent for CR from simulated textile wastewater and the excellent reusability indicated the adsorbent has great potentials in the practical application of wastewater treatment.

引用

页数：13

共 61 条

[1] Simultaneous sorption of dyes and toxic metals from waters using synthesized titania-incorporated polyamide [J].