Waste-derived zeolite from sugarcane bagasse ash and water treatment plant sludge for sustainable industrial dye removal
Joana Eliza de Santana, Antônio Elias dos Santos Neto, Fábio Gabriel Silva de Andrade, Aldebarã Fausto Ferreira, Marcos Gomes Ghislandi, Maurício Alves da Motta Sobrinho
TL;DR
This paper shows how to make a zeolite from industrial waste to efficiently remove dyes from water, offering a sustainable solution for wastewater treatment.
Contribution
The novel contribution is the synthesis of a high-performance adsorbent from sugarcane bagasse ash and water treatment sludge for dye removal.
Findings
The adsorbent achieved a maximum dye removal capacity of 250 mg·g−1.
The material maintained performance over three regeneration cycles using a diluted NaOH solution.
Competitive anions like sulfate and bicarbonate reduced dye uptake due to competitive adsorption.
Abstract
This study presents a sustainable route for synthesizing zeolites by valorizing two abundant industrial residues: sugarcane bagasse ash and water treatment plant sludge. The synthesized material, primarily composed of sodalite as confirmed by XRD and SEM, was applied for the removal of Acid Red 27 (AR27), a synthetic dye widely used in the food, cosmetics, and household product industries. The adsorption kinetics followed a pseudo-second-order model, suggesting dependence on active site availability, while isotherm analysis indicated multilayer adsorption consistent with the BET model, with an adsorption capacity reaching 250 mg·g−1. Experiments conducted with competitive anions suggest the adsorption mechanism in the first layer predominantly involved electrostatic interactions; the dye structure suggests π–π stacking for subsequent layers. Coexisting anions, particularly sulfate and…
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Taxonomy
TopicsAdsorption and biosorption for pollutant removal · Zeolite Catalysis and Synthesis · Clay minerals and soil interactions