Preparation of flower-like structured CaCO<sub>3</sub> biosorbent for efficient methylene blue removal
<p>Driven by rising global need for fabrics, dye-contaminated wastewater from the textile industry poses a major environmental issue. The existence of dyes in wastewater can negatively affect plants and aquatic animals by reducing light penetration and oxygen levels. The objective of this stud...
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2025
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| Tóm tắt: | <p>Driven by rising global need for fabrics, dye-contaminated wastewater from the textile industry poses a major environmental issue. The existence of dyes in wastewater can negatively affect plants and aquatic animals by reducing light penetration and oxygen levels. The objective of this study was to prepare, characterize, and investigate the removal efficiency of calcium carbonate synthesized from eggshells, comparing its effectiveness with membrane-peeled and unpeeled eggshells. Additionally, the effect of surfactant addition during the synthesis process on calcium carbonate dispersion was investigated. The synthesized calcium carbonate biosorbents were characterized, revealing a rhombohedral crystal structure corresponding to the aragonite phase, one of the calcium carbonate allotropes. The flower-like CaCO<sub>3</sub> biosorbents derived from unpeeled eggshells without surfactant dispersant underwent calcination at a temperature of 800 °C for 4 h exhibited the highest specific surface area of 171.36 m<sup>2</sup> g<sup>−1</sup>. For methylene blue removal efficiency, the amount of 1 g biosorbent, the initial methylene blue concentration of 100 mg L<sup>−1</sup>, and the adsorption time of 30 min under pH 7.3 showed the highest methylene blue removal efficiency of 95.44%, corresponding to an adsorption capacity of 95.44 mg g<sup>−1</sup>. It was effective for reuse up to 5 times with an average removal efficiency ranging from 86.12 to 89.38%. The adsorption behavior followed the Freundlich isotherm and the kinetics fitted well with the pseudo-second-order model. The excellent removal performance of methylene blue dye contaminated both synthetic and textile industry wastewater, with a green chemical approach and cost-effectiveness, demonstrated that eggshell biomaterial was a good candidate for practical application.</p> <p>Eggshell was prepared into flower-like CaCO<sub>3</sub> bio-adsorbents via a green synthesis approach.</p> <p>The bio-adsorbent displayed effective methylene blue removal at 95.44% with reliable reusability of 86% efficiency after 5 cycles.</p> <p>Methylene blue adsorption on CaCO<sub>3</sub> followed the Freundlich isotherm and pseudo-second-order kinetics.</p> <p>Eggshell biosorbents exhibited potential for methylene blue removal in textile wastewater.</p> |
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