Adsorption of heavy metal cations using coal fly ash modified by hydrothermal method

被引：163

作者：

Nascimento, Marisa ^{[1
]}

Moreira Soares, Paulo Sergio ^{[2
]}

de Souza, Vicente Paulo ^{[2
]}

机构：

[1] Univ Fed Fluminense, Dept Met Engn, BR-27255250 Rio De Janeiro, Brazil

[2] Ctr Mineral Technol, BR-21941908 Rio De Janeiro, Brazil

来源：

FUEL | 2009年 / 88卷 / 09期

关键词：

Coal fly ash; Adsorption isotherm; Zeolite; WASTE-WATER; EFFECTIVE ADSORBENTS; NATURAL ZEOLITES; REMOVAL; IMMOBILIZATION; CONVERSION; CADMIUM; SOILS;

D O I：

10.1016/j.fuel.2009.01.007

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

In this study, the adsorption properties of synthetic zeolite produced from Brazilian coal fly ash were investigated for some heavy metal cations (Zn, Cu, Mn and Pb). The batch method has been employed, using metal concentrations in solution ranging from 100 to 3000 mg/l. Preliminary statistical analysis has indicated that temperature and time of synthesis of zeolites were the most important variables that affect the their adsorption capacity. Results lead to the conclusion that a hydrothermal treatment can increase from 2 to 25 times the adsorption capacity (CA) of the coal ash comparing to its original capacity. The ion-exchange characteristic of the zeolites was determined using Langmuir, Freundlich and Dubinin-Kaganer-Radushkevich isotherms. The adsorption increases as cation concentrations in aqueous solution increases. The preference order observed for adsorption is Pb > Cu > Zn > Mn. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：1714 / 1719

页数：6

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