期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 224, 期 -, 页码 164-171出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2018.07.049
关键词
Coal fly ash; Synthetic zeolite; Nanocomposites; Silver nanoparticles; Mercury removal; Water treatment
资金
- Ministry of Education and Science of Kazakhstan
- Nazarbayev University Research Council [SOE 2015 009]
- Royal Academy of Engineering (UK) [IAPP/1516/13]
Coal fly ash-derived zeolites have attracted considerable interest in the last decade due to their use in several environmental applications such as the removal of dyes and heavy metals from aqueous solutions. In this work, coal fly ash-derived zeolites and silver nanoparticles-impregnated zeolites (nanocomposites) were synthesized and characterized by TEM/EDX, SEM/EDX, XRD, XRF, porosimetry (BET), particle size analysis (PSA) and zeta potential measurements. The synthesized materials were used for the removal of Hg2+ from aqueous solutions. The results demonstrated that nanocomposites can remove 99% of Hg2+, up to 10% and 90% higher than the removal achieved by the zeolite and the parent fly ash, respectively. Leaching studies further demonstrated the superiority of the nanocomposite over the parent materials. The Hg2+ removal mechanism is complex, involving adsorption, surface precipitation and amalgamation.
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