Immobilization of hexavalent chromium by fly ash-based geopolymers

被引：47
|
作者：
Nikolic, Violeta [1 ]
Komljenovic, Miroslav [1 ]
Dzunuzovic, Natasa [1 ]
Ivanovic, Tijana [1 ]
Miladinovic, Zoran [2 ]
机构：
[1] Univ Belgrade, Inst Multidisciplinary Res, Kneza Viseslava 1, Belgrade 11030, Serbia
[2] Inst Gen & Phys Chem, Belgrade, Serbia
来源：
COMPOSITES PART B-ENGINEERING | 2017年 / 112卷
关键词：
Mechanical properties; Physical properties; Environmental degradation; Powder processing; Geopolymers; ALKALINE ACTIVATION; PART II; WASTE; SI-29; STABILIZATION/SOLIDIFICATION; DESIGN; CEMENT; RATIO; SLAG;
D O I：
10.1016/j.compositesb.2016.12.024
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper the immobilization of hexavalent chromium (Cr (VI)) by fly ash (FA)-based geopolymers was investigated, depending on FA characteristics, mechanical activation of FA, geopolymer synthesis conditions and concentration of Cr added. The effectiveness of Cr immobilization was determined via investigation of geopolymer compressive strength and Cr leaching. Structural changes of geopolymers during the Cr immobilization were assessed by means of gas adsorption, XRD, and NMR analysis. FA reactivity was a key factor determining both physical-mechanical and immobilizing properties of geopolymers. Mechanical activation of FA caused an increase of both geopolymer strength and effectiveness of Cr immobilization. The presence of Cr induced physical-mechanical and structural changes in geopolymers. The correlation between concentration of Cr leached and geopolymer physical-mechanical and structural parameters was established. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：213 / 223
页数：11
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