Journal
ENVIRONMENTAL POLLUTION
Volume 268, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2020.115705
Keywords
Adsorption membrane; MoS2; PVDF; Mercury; Recyclability
Categories
Funding
- National Natural Science Foundation of China [52000011, U1403295]
- Educational Commission of Xinjiang [XJEDU2019Y052, XJEDU2017S055]
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The study developed a novel membrane adsorbent with high adsorption capacity for the removal of heavy metal ions from wastewater, showing excellent recyclability and practical significance in water treatment applications.
The exploitation of a new adsorbent with a high adsorption performance and recyclability is of great practical significance for the treatment of wastewater containing mercury ions. In this study, a novel membrane adsorbent was fabricated by blending MoS2 nanosheets into a PVDF polymer matrix (P-PVDF/MoS2) followed by non-solvent-induced phase conversion. This material was able to bind mercury ions and was not affected by the solution ionic strength, co-existing anions, or interfering heavy metal ions. The optimal pH range for mercury ion elimination was 4.5-6.0, and P-PVDF/MoS2 exhibited a maximum adsorption capacity of 578 mg g(-1). The pseudo-second-order adsorption kinetics and Langmuir isotherm models best described the adsorption process. The adsorption mechanism was mainly monolayer chemisorption, for which the S groups were the major active sites. Furthermore, the membrane could be removed from the aqueous solution easily using tweezers, and the removal efficiency of mercury ions remained over 90% after ten cycles. This study suggests that the inexpensive and recyclable P-PVDF/MoS2 membranes can be used for the efficient removal of heavy metal ions from wastewater at a large scale. (C) 2020 Elsevier Ltd. All rights reserved.
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