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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front Envir Sci Eng    2014, Vol. 8 Issue (1) : 54-61    https://doi.org/10.1007/s11783-013-0493-4
RESEARCH ARTICLE
Effect of seawater salinity on the synthesis of zeolite from coal fly ash
Yanqing YU1,2,3, Xiaoliang LI4, Xiaolan ZOU1,2, Xiaobin ZHU1,2()
1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; 2. Graduate School, Chinese Academy of Sciences, Beijing 100049, China; 3. School of Environment, Tsinghua University, Beijing 100084, China; 4. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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Abstract

A novel method for the synthesis of zeolite was developed in this paper. The synthesis was carried out by hydrothermal activation after alkali fusion and coal fly ash (CFA) was used as raw material with seawater of different salinities. Seawater salinity was varied from 32 to 88 for zeolite crystallization during the hydrothermal process. The results show that seawater salinity plays an important role in zeolite synthesis with CFA during hydrothermal treatment. The products were a mixture of NaX zeolite and hydroxysodalite; seawater salinity more strongly affected the crystallization than the type and chemical composition of the zeolites. The yield of CFA transformed into zeolite gradually rose with the increase in salinity, reaching a transformation rate of 48%–62% as the salinity increased from 32 to 88, respectively. The proposed method allows for the efficient disposal of by-products; therefore, the application of seawater in zeolite synthesis presents promising economic and ecological benefits.

Keywords coal fly ash (CFA)      seawater salinity      zeolite synthesis     
Corresponding Author(s): ZHU Xiaobin,Email:zhu.xb@hotmail.com   
Issue Date: 01 February 2014
 Cite this article:   
Yanqing YU,Xiaoliang LI,Xiaolan ZOU, et al. Effect of seawater salinity on the synthesis of zeolite from coal fly ash[J]. Front Envir Sci Eng, 2014, 8(1): 54-61.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-013-0493-4
https://academic.hep.com.cn/fese/EN/Y2014/V8/I1/54
Fig.1  X-ray diffraction pattern of the CFA (M= mullite Q= quartz)
compositioncontent/%
SiO245.46
Al2O326.38
Fe2O33.99
CaO1.86
K2O1.26
Na2O1.09
MgO0.57
Ti0.49
P0.08
Mn0.02
Tab.1  Chemical compositions of fly ash used in the experiment
salinityNaMgCaKSr
32102001191379.8369.56.42
42129001567519.2480.38.70
76239952920885.8906.214.95
882812534621032107017.48
Tab.2  Chemical compositions of seawater used in the experiment/(mg·L)
Fig.2  X-ray diffraction patterns of zeolite synthesized under different salinity samples (X= NaX-type zeolite; S= hydroxysodalite)
Fig.3  Graphical representation of the amount of zeolites synthesized using distilled water and seawater
samplesHONaAlSiH2ONa2OAl2O3SiO2
ZFA02.052.614.214.316.917.719.127.136.1
ZFA320.746.818.616.517.46.625.131.237.1
ZFA420.846.918.516.517.46.725.031.237.1
ZFA760.746.518.816.617.46.025.431.437.2
ZFA880.646.319.016.717.45.625.631.637.2
Tab.3  Elements and chemical composition of zeolites synthesized in different salinity samples/%
Fig.4  SEM images of fly ash (a) and synthesized zeolite: (b) NaX zeolite and hydroxysodalite, (c) NaX zeolite, and (d) hydroxysodalite
Fig.5  Transformation yield of zeolites synthesized under different salinity samples
samplesCEC/(mmol·100 g-1)SSA/(m2·g-1)
CFA7.961.18
ZFA0388.59148.56
ZFA32320.64219.92
ZFA42304.46225.84
ZFA76317.40166.41
ZFA88262.40175.30
Tab.4  CEC and SSA of zeolites synthesized under different salinity samples
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