Double-Barrier mechanism for chromium immobilization: A quantitative study of crystallization and leachability

Liao, Changzhong1,2; Tang, Yuanyuan3; Liu, Chengshuai1,4; Shih, Kaimin2; Li, Fangbai1

2016-07-05

10.1016/j.jhazmat.2016.03.020

JOURNAL OF HAZARDOUS MATERIALS   影响因子和分区

0304-3894

1873-3336

Glass-ceramics are well known for the excellent combination properties provided by their components, a glassy matrix and crystalline phases, and have promising applications in the immobilization and detoxification of solid waste containing toxic metals. Glass-ceramic products were successfully synthesized in CaO-MgO-SiO2-Al2O3 -Cr2O3 system. Two key measures - partitioning ratio of Cr in the spinel and Cr leaching ratio - were used to investigate the mechanism of Cr immobilization in the glass-ceramic products. The results of powder X-ray diffraction revealed that both spinel and diopside were major crystalline phases in the products. The value of x in the MgCrxAl2-xO4 spinel was highly related to the amount of Cr2O3 added to the glass-ceramic system. As Cr2O3 content increased, the proportion of spinel phase increased, while that of glass phase decreased. The partitioning ratio of Cr in spinel phase was about 70% for 2 wt.% Cr2O3, and increased to 90% when loaded with 10 wt.% of Cr2O3. According to the results of the prolonged toxicity characteristic leaching procedure, the Cr leaching ratio decreased with the increase of Cr partitioning ratio into the spinel phase. The findings of this study clearly indicate that glass-ceramic formed by spinel structure and residual glass successfully immobilized Cr. (C) 2016 Elsevier B.V. All rights reserved.

Glass-ceramic Spinel Chromium immobilization Rietveld quantitative XRD Leaching performance

SCI ; EI

英语

其他

General Research Fund Scheme of the Research Grants Council of Hong Kong[715612] ; General Research Fund Scheme of the Research Grants Council of Hong Kong[17206714]

Engineering ; Environmental Sciences & Ecology

Engineering, Environmental ; Environmental Sciences

WOS:000375630300028

ELSEVIER SCIENCE BV

20161202127493

Alumina ; Aluminum oxide ; Ceramic products ; Chromium ; Crystalline materials ; Detoxification ; Glass ceramics ; Leaching ; Magnesia ; Silica ; X ray diffraction

Chromium and Alloys:543.1 ; Chemical Operations:802.3 ; Inorganic Compounds:804.2 ; Ceramics:812.1 ; Crystalline Solids:933.1

ENGINEERING

Web of Science

1.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China
2.Univ Hong Kong, Dept Civil Engn, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China
3.South Univ Sci & Technol China, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
4.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550009, Peoples R China

Liao, Changzhong,Tang, Yuanyuan,Liu, Chengshuai,et al. Double-Barrier mechanism for chromium immobilization: A quantitative study of crystallization and leachability[J]. JOURNAL OF HAZARDOUS MATERIALS,2016,311:246-253.

Liao, Changzhong,Tang, Yuanyuan,Liu, Chengshuai,Shih, Kaimin,&Li, Fangbai.(2016).Double-Barrier mechanism for chromium immobilization: A quantitative study of crystallization and leachability.JOURNAL OF HAZARDOUS MATERIALS,311,246-253.

Liao, Changzhong,et al."Double-Barrier mechanism for chromium immobilization: A quantitative study of crystallization and leachability".JOURNAL OF HAZARDOUS MATERIALS 311(2016):246-253.