期刊
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH
卷 16, 期 2, 页码 -出版社
SPRINGER INT PUBL AG
DOI: 10.1007/s41742-022-00395-9
关键词
Fly-ash derived zeolites; Heavy-metal removal; Ion selectivity; Multi-cation adsorption; NaP1
资金
- Ghana Education Trust Fund (GETFund)
- University of Nottingham, Faculty of Engineering
Fly-ash derived zeolites are effective adsorbents for removing heavy metals from water, with high adsorption capacity and selectivity.
Fly-ash derived zeolites have recently-received great attention as cheaper adsorbents to remove heavy metals from water since they can be synthesized from a waste product. In this study, we evaluated the single- and multi-cation adsorption efficiencies of fly-ash derived NaP1 for the removal of zinc (Zn), copper (Cu) and lead (Pb). We also determined precipitation and leaching from NaP1 during the adsorption. Results showed that the uptake capacities for Zn (34 mg/g) and Pb (192 mg/g) were higher than other fly-ash derived NaP1 and adsorbents such as clinoptilolite and activated carbon. The Cu uptake was estimated similar to 14.6 mg/g. Pb2+ > Cu2+ > Zn2+ is the order for the metal cation selectivity of NaP1. Langmuir adsorption isotherm and pseudo-second order kinetic model fitted best for all elements. The metal uptake occurred in 15 min. Diffusion of hydrated metals through microporous channels is the rate-determining step.
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