Journal
MATERIALS TODAY CHEMISTRY
Volume 18, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtchem.2020.100376
Keywords
Water contamination; Molybdenum disulphide; Zeolite; Adsorption; Heavy metal ions; Gold mine water
Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [2019281010007B]
- National Research Foundation (NRF) of Korea - Korea government (MSIT) [2019R1A5A8080290]
- Korea Evaluation Institute of Industrial Technology (KEIT) [2019281010007B] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This work explored the potential of clinoptilolite, molybdenum sulphide (MoS2), and MoS2-clinoptilolite composite in lead (Pb) removal from aqueous medium and industrial mining wastewater. MoS2-clinoptilolite composite was successfully prepared by a hydrothermal method. The surface properties, structure, and composition of the synthesized composite and the parent compounds were analyzed by scanning electron microscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy. The removal efficiency of lead from aqueous solution was studied in batch-mode experiments. The MoS2-clinoptilolite was used for the removal of Pb ions (50 mg/L) from an aqueous solution: similar to 100% of the Pb was removed with a MoS2-clinoptilolite dose of 0.075 g, pH 6 at 328K within 90 min. The adsorption capacities of Pb onto MoS2-clinoptilolite were found to be higher than those onto clinoptilolite. Metal ion adsorption behavior was well explained by the Freundlich model, that is, multilayer adsorption of Pb molecules occurred on the heterogeneous surface of adsorbents in case of clinoptilolite, while in the case of MoS2-clinoptilolite, the Langmuir model was suitable, that is, the adsorption occurred on a monolayer surface. The rate of Pb adsorption was explained by pseudo-second order model suggesting that the adsorption process is presumably chemisorption. Thermodynamic parameters such as DH degrees, DS degrees, and DG degrees were calculated, which indicated that the adsorption was spontaneous and exothermic in nature. The selectivity of each adsorbent for Pb was also tested by adding the adsorbents to real gold mine water which contains competitive metal ions. (C) 2020 Elsevier Ltd. All rights reserved.
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