Adsorption of chromium (VI) on hydrotalcite-hydroxyapatite material doped with carbon nanotubes: Equilibrium, kinetic and thermodynamic study

被引：61

作者：

Rodrigues, E. ^{[1
]}

Almeida, O. ^{[1
]}

Brasil, H. ^{[2
]}

Moraes, D. ^{[1
]}

dos Reis, M. A. L. ^{[3
]}

机构：

[1] Fed Univ Para, ICEN, BR-66075110 Belem, PA, Brazil

[2] Fed Univ Para, ITEC, BR-66075210 Belem, PA, Brazil

[3] Fed Univ Para, Fac Exact Sci & Technol, BR-68440000 Abaetetuba, PA, Brazil

来源：

APPLIED CLAY SCIENCE | 2019年 / 172卷

关键词：

HT-HAp/CNT; Cr adsorption; Freundlich isotherm; Breakthrough curve; Physisorption; HEAVY-METAL IONS; AQUEOUS-SOLUTION; REMOVAL; PREDICTION; HYDROXIDES; EXCHANGE; CATALYST; ETHANOL; SYSTEMS; CLAYS;

D O I：

10.1016/j.clay.2019.02.018

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Hexavalent chromium adsorption in aqueous solution was studied in a fixed bed column with a hydrotalcite-hydroxyapatite (HT-HAp) material doped with carbon nanotubes (CNT) at 333.15 K. Equilibrium, kinetic and thermodynamic behaviors were the focus of this work. The CNT doping was performed in two different proportions (5 and 15%wt.). Isotherm (Langmuir, Freundlich, Temkin, Redlich-Peterson, Sips, and Toth) and kinetics (Thomas, Yoon-Nelson, and Adams-Bohart) models were tested. HT-HAp/CNT15 sample presented the best Cr(VI) bated proportion (76.97%R). The adsorption behavior was fit by the Freundlich model, following a pseudo-second order kinetic mechanism confirmed by Thomas model. Thermodynamic parameters indicated a physisorption process.

引用

页码：57 / 64

页数：8

共 55 条

[1] Synthesis and characterization of magnetic nanocomposite of chitosan/SiO2/carbon nanotubes and its application for dyes removal [J].