Alginate-based porous polyHIPE for removal of single and multi-dye mixtures: Competitive isotherm and molecular docking studies

Hoda Ansari; Akeem Adeyemi Oladipo; Mustafa Gazi

doi:10.1016/j.ijbiomac.2023.125736

Alginate-based porous polyHIPE for removal of single and multi-dye mixtures: Competitive isotherm and molecular docking studies

Int J Biol Macromol. 2023 Aug 15:246:125736. doi: 10.1016/j.ijbiomac.2023.125736. Epub 2023 Jul 7.

Authors

Hoda Ansari¹, Akeem Adeyemi Oladipo², Mustafa Gazi³

Affiliations

¹ Polymeric Materials Research Laboratory, Chemistry Department, Faculty of Arts and Science, Eastern Mediterranean University, TR North Cyprus, Famagusta via Mersin 10, Türkiye.
² Polymeric Materials Research Laboratory, Chemistry Department, Faculty of Arts and Science, Eastern Mediterranean University, TR North Cyprus, Famagusta via Mersin 10, Türkiye. Electronic address: akeem.oladipo@emu.edu.tr.
³ Polymeric Materials Research Laboratory, Chemistry Department, Faculty of Arts and Science, Eastern Mediterranean University, TR North Cyprus, Famagusta via Mersin 10, Türkiye. Electronic address: mustafa.gazi@emu.edu.tr.

PMID: 37423450
DOI: 10.1016/j.ijbiomac.2023.125736

Abstract

A novel hydrophilic porous alginate-based polyHIPE (AGA) was synthesized via an oil-in-water emulsion templating approach. AGA was used as an adsorbent for removing methylene blue (MB) dye in single- and multi-dye systems. BET, SEM, FTIR, XRD, and TEM were used to characterize AGA to elucidate its morphology, composition and physicochemical properties. According to the results, 1.25 g/L AGA adsorbed 99 % of 10 mg/L MB in 3 h in a single-dye system. The removal efficiency decreased to 97.2 % in the presence of 10 mg/L Cu²⁺ ions and 40.2 % when the solution salinity increased to 70 %. In a single-dye system, the experimental data do not match well with the Freundlich isotherm, pseudo-first order, and the Elovich kinetic model, however, in a multi-dye system, it fit well with both extended Langmuir and the Sheindorf-Rebhun-Sheintuch. Notably, AGA removed 66.87 mg/g in a dye solution containing only MB, whereas 50.14-60.01 mg/g adsorption of MB was accomplished in a multiple-dye system. According to the molecular docking analysis, the dye removal process involved chemical bonds between the functional groups of AGA and the dye molecules, hydrogen bonds, hydrophobic and electrostatic interactions. The overall binding score of MB decreased from -26.9 kcal/mol in a single-dye system to -18.3 kcal/mol in a ternary system.

Keywords: Carbohydrate material; Competitive adsorption; Molecular docking; Ternary dye removal; Textile wastewater.