Cu(II) Adsorption on Modified Bentonitic Clays: Different Isotherm Behaviors in Static and Dynamic Systems

被引：52

作者：

de Almeida Neto, Ambrosio Florencio ^{[1
]}

Adeodato Vieira, Melissa Gurgel ^{[2
]}

Carlos da Silva, Meuris Gurgel ^{[1
]}

机构：

[1] State Univ Campinas UNICAMP, Dept Thermofluidynam, Sch Chem Engn, BR-13083852 Campinas, SP, Brazil

[2] State Univ Campinas UNICAMP, Dept Chem Proc, BR-13083852 Campinas, SP, Brazil

来源：

MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS | 2012年 / 15卷 / 01期

基金：

巴西圣保罗研究基金会;

关键词：

adsorption; heavy metal removal; bentonitic clay; MONTMORILLONITE; REMOVAL; WATER; BIOSORPTION; DESORPTION; SORPTION; CO(II); COPPER; NICKEL; EXAFS;

D O I：

10.1590/S1516-14392011005000089

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Cu(II) removal equilibrium from aqueous solutions using calcined clays "Bofe" and "Verde-lodo" has been studied by batch and fixed-bed in static and dynamic systems, respectively. Analyses were performed for physicochemical characterization of clays using the techniques: X-ray fluorescence (XRF), thermogravimetry (TG), N-2 adsorption (BET) and Cationic Exchange Capacity (CEC). Batch experiments were performed at a constant temperature, adjusting the pH of the solution in contact with clays. Adsorption assays in fixed bed were conducted at the flow rate determined through mass transfer zone (MTZ). Langmuir and Freundlich models were adjusted to equilibrium data. The results of characterization indicated that the temperature of 500 degrees C is best suited for the calcination of the clays. The maximum adsorption capacity was higher for dynamic system than fixed bed compared to static system, enhancing from 0.0748 to 0.1371 and from 0.0599 to 0.22 mmol. g(-1) of clay for "Bofe" and "Verde-lodo", respectively.

引用

页码：114 / 124

页数：11

共 28 条

[1] A review of potentially low-cost sorbents for heavy metals [J].