Utilization of activated CO2-neutralized red mud for removal of arsenate from aqueous solutions

被引：50

作者：

Sahu, Ramesh Chandra ^{[1
]}

Patel, Rajkishore ^{[1
]}

Ray, Bankim Chandra ^{[2
]}

机构：

[1] Natl Inst Technol, Dept Chem, Rourkela 769008, Orissa, India

[2] Natl Inst Technol, Dept Met & Mat Engn, Rourkela 769008, Orissa, India

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2010年 / 179卷 / 1-3期

关键词：

Red mud; CO2; Arsenate; Kinetics; Isotherms; PUBLIC-HEALTH; ADSORPTION; IRON; PHOSPHATE; SURFACE; FERRIHYDRITE; DESORPTION; HYDROXIDE; OXIDATION; WASTE;

D O I：

10.1016/j.jhazmat.2010.03.105

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A laboratory study was conducted to investigate the ability of activated CO2-neutralized red mud (ANRM) for the removal of arsenate from the aqueous solutions. The batch adsorption experiments were conducted with respect to adsorbent dose, equilibrium pH, contact time, initial arsenate concentration, kinetics, Langmuir isotherms. The mechanisms involved in adsorption of arsenate ions on ANRM were characterized by using XRD, FT-IR, UV-vis, SEM/EDX, and chemical methods. The percentage removal was found to increase gradually with decrease of pH and maximum removal was achieved at pH similar to 4. Adsorption kinetic studies revealed that the adsorption process followed pseudo-second-order kinetics and equilibrates within 24 h. FT-IR spectra of ANRM before and after adsorption reveals the binding of arsenate to the adsorbent. The adsorption data were fitted to linearly transformed Langmuir isotherm with R-2 (correlation coefficient) > 0.99. Arsenate adsorbed ANRM can be regenerated using NaOH solution at pH 12.0. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1007 / 1013

页数：7

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