Work

Converting Durian Husk Into Adsorbent Beads for Methylene Blue Adsorption: Synthesis, Kinetics, Isotherms, and Reusability

Year: 2025

Type: article

Abstract: ABSTRACT Environmental pollution from textile dyeing wastewater, particularly the discharge of harmful dyes like methylene blue (MB), poses a significant challenge. This study presents an innovative solution for dyeing wastewater treatment by utilizing durian husk, an agricultural waste, as an adsorbent for MB removal. The durian husk was converted into activated carbon through carbonization and activation and then incorporated into an adsorbent bead using a droplet microencapsulation method with alginate and calcium ions. The material was characterized using techniques like TGA, SEM/EDS, FT‐IR, and BET surface area analysis. Batch adsorption experiments were conducted with contact time conditions ranging from 2 to 48 h, initial MB concentrations ranging from 5 to 40 mg/L showed optimal performance under conditions of pH 7, 24‐h contact time, and 20‐mg/L MB concentration. The adsorption process was controlled by internal diffusion, following the Freundlich isotherm, and was exothermic and physical in nature; electrostatic interactions, hydrogen bonding, π–π interactions, functional group interactions, pore filling, and internal mass transfer mechanisms were predicted to be the contributing mechanisms for the adsorption of MB on AL–AC adsorbent. The adsorbent demonstrated excellent reusability, maintaining its efficiency after 10 cycles; the beads retained over 80% removal efficiency after 10 consecutive cycles. The initial cycle removal efficiency was 97.99% ± 0.11% and decreased to 80.39% ± 0.24% after the 10th cycle. This durian husk–based adsorbent offers a sustainable, cost‐effective solution for dye‐contaminated water treatment.

Source: Asia-Pacific Journal of Chemical Engineering

DOI: 10.1002/apj.70201

Authors: L. H. V. Thanh, D. V. P. An, P. H. Phuc, L. T. Phu, T. T. B. Quyen, P. D. Toan

Institution: Can Tho University

Language: English

Topic: Adsorption and biosorption for pollutant removal

Subfield: Water Science and Technology

Field: Environmental Science

Domain: Physical Sciences

SDGs: Clean water and sanitation, Responsible consumption and production

Open Access status: hybrid

Estimated APC paid: $3,400