Methanol/CaCl 2 Wet Phase Inversion for Selective Separation of Heavy Metal Ions by Nylon 6-Mordenite Zeolite Composite
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RESEARCH PAPER
Methanol/CaCl2 Wet Phase Inversion for Selective Separation of Heavy Metal Ions by Nylon 6‑Mordenite Zeolite Composite Membranes Phuong Thanh Ton Nu1,2 · Takaomi Kobayashi1 Received: 11 June 2020 / Revised: 25 August 2020 / Accepted: 3 October 2020 © University of Tehran 2020
Abstract Nylon 6-mordenite composite membranes having porous morphology were applied to the selective separation of heavy metal ions from aqueous heavy metal solution with Pb2+, Cu2+ and Cd2+. The membrane preparation was carried out in the wet phase inversion method using methanol/CaCl2/Nylon 6 solution. The resultant membranes containing mordenite powders with 10, 20 and 30 wt% loading were obtained as coagulated in water. Depending on the mordenite loading in the composite membranes, the porous morphology was changed in a finger-like and/ or sponge structure. In batch adsorption experiments, the higher mordenite loading in the composite membranes was the higher separation capacity for heavy metal ions. The composite membrane loading 30 wt% mordenite (NZC 30) had the optimal performance of Pb2+ ion capture in the maximum adsorption capacity of 38.5 mg/g at pH 5. The batch separation factor calculated using Langmuir isotherm parameters supported the selective adsorption of P b2+ relative to those of C d2+ and C u2+. In addition, the permeabilities of water and the mixed ion solution with 20 mg/L concentration were investigated. The value of the separation factor of NZC 30 was 9.2 for P b2+ against C u2+. In the regeneration of the reused membranes, the values of the regeneration efficiency of NZC 30 still maintained a good separation performance in Pb2+ with 24.1 mg/g at 5-time reusing. Article Highlights • The porous nylon 6-mordenite zeolite composite membranes were fabricated by the wet phase inversion method
for the first report.
• The composite membrane containing 30 wt% mordenite (NZC 30) showed the extraordinary performance for the
separation of Pb2+ with 89.9 % from the mixture solution. • The separation factor of NZC 30 was 9.2 for Pb2+against Cu2+ • The composite membranes can be used as a low-cost and environmentally friendly adsorbent for the separation of heavy metals from wastewater.
* Takaomi Kobayashi [email protected] 1
Department of Materials Science and Technology, Nagaoka University of Technology, 16031 Kamitomioka, Nagaoka, Niigata 940‑2188, Japan
Faculty of Environment, Vietnam National University Ho Chi Minh City - University of Science, Ho Chi Minh City, Vietnam
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Vol.:(0123456789)
International Journal of Environmental Research
Graphic Abstract Porous nylon 6-mordenite composite membranes were fabricated from methanol/CaCl2/Nylon 6 solution via the wet phase inversion method and applied to selective separation of Pb2+, Cu2+ and Cd2+ from mixture solution
Keywords Nylon 6 · Mordenite · Composite membrane · Selective separation · Heavy metals
Introduction In the purpose of aqua-environmental conservation, there were developed techniques for separating
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