Thermodynamics, Kinetics, and Regeneration Studies for Adsorption of Cr(VI) from Aqueous Solutions using Modified Cellulose as Adsorbent

被引:0
|
作者
Lin, Chunxiang [1 ]
Qiao, Sha [1 ]
Luo, Wei [1 ]
Liu, Yifan [1 ]
Liu, Danhui [1 ]
Li, Xiaojuan [1 ]
Liu, Minghua [1 ]
机构
[1] Fuzhou Univ, Coll Environm & Resources, Fuzhou 350108, Peoples R China
来源
BIORESOURCES | 2014年 / 9卷 / 04期
基金
美国国家科学基金会;
关键词
Cellulose adsorbent; Cr(VI); Adsorption; Kinetics; Thermodynamics; DEAD FUNGAL BIOMASS; HEXAVALENT CHROMIUM; CR-VI; ACTIVATED CARBON; ION-EXCHANGE; CONTAMINATED WATER; TREATED BIOMASS; BROWN SEAWEED; ECKLONIA SP; REMOVAL;
D O I
10.15376/biores.9.4.6998-7017
中图分类号
TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];
学科分类号
0805 ; 080502 ; 0822 ;
摘要
Cellulose adsorbent was prepared by ATRP grafting of glycidyl methacrylate onto a cellulose backbone with subsequent functionalization with ethanediamine, and then used for the removal of Cr(VI) from aqueous solution. Batch experiments were carried out to investigate the effects of initial pH and initial Cr(VI) concentration on the adsorption performance. The optimum pH for adsorption of Cr(VI) ranged from 2 to 3, and the maximum uptake of Cr(VI) from solution was 500 mg/g at pH 3.0 and 50 degrees C. Langmuir and Freundlich isotherms were applied to the adsorption process, and the thermodynamic parameters were calculated. The results showed that the sorption process to be feasible, spontaneous, and endothermic. Kinetics studies revealed that the pseudo-second-order kinetic model fitted well with the experimental data and the intra-particle diffusion was not the only rate-determining step for Cr(VI) sorption onto adsorbent. The cellulose adsorbent before and after Cr(VI) adsorption were characterized using scanning electron microscopy (SEM), energy dispersive x-ray analysis (EDX), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS). Regeneration of cellulose adsorbent loaded with Cr(VI) can be achieved by treating with 2.0M NaOH.
引用
收藏
页码:6998 / 7017
页数:20
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