SYNTHESIS OF BENTONITE/ALGINATE COMPOSITE BEADS  AND THEIR APPLICATION FOR ADSORPTION OF CRYSTAL VIOLET DYE

Thiều Quang Quốc Việt; Trần Nguyễn Phương Lan; Lý Kim Phụng

doi:10.34238/tnu-jst.13144

SYNTHESIS OF BENTONITE/ALGINATE COMPOSITE BEADS AND THEIR APPLICATION FOR ADSORPTION OF CRYSTAL VIOLET DYE

About this article

Received: 28/06/25 Revised: 21/11/25 Published: 25/11/25

Authors

1. Thieu Quang Quoc Viet, Can Tho University
2. Tran Nguyen Phuong Lan, Can Tho University
3. Ly Kim Phung , Can Tho University

Abstract

This study synthesized the composite beads based on bentonite sources in Vietnam and alginate for the adsorption of crystal violet in wastewater. The characteristic properties of bentonite and alginate in the beads were determined by Fourier-transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy methods. The functional groups of both bentonite and alginate could be found in the composite. At the same time, the morphology of the composite beads were spherical beads with a rough surface. The crystal violet removal under different conditions, including adsorbent dosage, initial crystal violet concentration, contact time, and competitive ions, was investigated. The adsorption efficiency was 90.45% under pH 7, an adsorbent dosage of 1 g/L, and an initial crystal violet concentration of 138.82 mg/L within 90 min. Especially, the adsorption efficiency value was maintained above 70% in the environment containing competing ions such as Na⁺, K⁺, Ca²⁺, Mg²⁺, and their mixture. The experimental data were in good agreement with the Sips model (R²= 0.989) and the pseudo-first-order kinetic model (R²= 0.999). After 10 cycles, the adsorption efficiency reduced by about 12.29% compared to the first round. These findings suggest that the synthesized composite beads can be a promising absorbent for the dye removal in wastewater.

Keywords

Activated bentonite/ alginate composite bead; Natural mineral; Adsorption; Crystal violet; Efficient reuse

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DOI: https://doi.org/10.34238/tnu-jst.13144

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