Activated biochar derived from cactus fibres - Preparation, characterization and application on Cu(II) removal from aqueous solutions

被引：151
作者：
Hadjittofi, Loukia [1 ]
Prodromou, Melpomeni [1 ]
Pashalidis, Ioannis [1 ]
机构：
[1] Univ Cyprus, Dept Chem, CY-1678 Nicosia, Cyprus
来源：
BIORESOURCE TECHNOLOGY | 2014年 / 159卷
关键词：
Biomass by-product; Activated carbon; Metal ions; Adsorption; Waters; COPPER REMOVAL; ADSORPTION; WATER;
D O I：
10.1016/j.biortech.2014.03.073
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
The adsorption efficiency of activated biochar prepared from cactus fibres regarding the removal of Cu(II) from aqueous solutions has been investigated as a function of various physicochemical parameters (e.g. pH, initial metal concentration, ionic strength, temperature and contact time). Activation of the biochar took place using nitric acid oxidation and characterisation was performed by SEM analysis, FTIR spectroscopy, N-2 adsorption and acid-base titrations. The results show that laminar structures constitute the material and carboxylic moieties are the predominant binding sites. The experimental data were analyzed by the Langmuir, Freundlich and Dubinin-Radushkevich adsorption models and the monolayer adsorption capacity was found to be 3.5 mol kg (1). The effect of ionic strength and temperature on the adsorption efficiency indicates that at low pH outer-sphere and at near neutral pH inner-sphere complexes are the predominant surface species and the kinetic data obtained were fitted very well by the Lagergren rate expression. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：460 / 464
页数：5
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