DOI: https://doi.org/10.9767/bcrec.20747

ZIF-67 Incorporated Sodium Alginate/Polyvinyl Alcohol Composite Beads for Efficient Adsorptive Removal of Reactive Blue 19 from Aqueous Solution

1Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City, 12 Nguyen Van Bao Rd, Ho Chi Minh City 700000, Viet Nam

2Faculty of Chemical Engineering, Ho Chi Minh City University of Industry and Trade, 140 Le Trong Tan Street, Tay Thanh Ward, Tan Phu District, Ho Chi Minh, 70000, Viet Nam

Received: 20 May 2026; Revised: 27 Jun 2026; Accepted: 27 Jun 2026; Available online: 30 Jun 2026; Published: 30 Oct 2026.
Editor(s): Istadi Istadi
Open Access Copyright (c) 2026 by Authors, Published by BCREC Publishing Group
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
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Abstract

In this study, ZIF-67/SA/PVA composite beads were synthesized and used to remove Reactive Blue 19 (RB19) from aqueous solution. The composites were prepared by integrating cobalt-based ZIF-67 into a sodium alginate/polyvinyl alcohol matrix with different SA/PVA ratios. The physicochemical properties of the composites were characterized by FT-IR, XRD, SEM–EDS, BET, TG, and pHpzc analyses. Among the investigated samples, ZIF-67/SA/PVA-1:3 exhibited the highest RB19 removal efficiency (96.45%). The removal efficiency increased with increasing adsorbent dosage and temperature, but decreased at higher RB19 concentrations. The pH-dependent adsorption behavior was consistent with the pHpzc of 7.77. The negative ΔG° values (−5.308 to −7.298 kJ.mol-1) and the positive ΔH° value of 15.297 kJ.mol-1 indicated that the adsorption process was spontaneous and endothermic. The equilibrium data fitted the Langmuir model better than the Freundlich model. These findings demonstrate the potential of ZIF-67/SA/PVA as a composite adsorbent for removing reactive dyes from contaminated water. Copyright © 2026 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Keywords: ZIF-67; Alginate; PVA; Reactive Blue 19; Wastewater treatment.
Funding: Industrial University of Ho Chi Minh City ; Ho Chi Minh City University of Industry and Trade

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Section: Original Research Articles
Language : EN
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