Magnetized Bentonite Clay Particles: An Eco-friendly and Economical Adsorbent for efficient Remediation of Crystal Violet Dye-Polluted Water

• Published in: Arabian journal for science and engineering (2011) Vol. 49; no. 1; pp. 801 - 813
• Main Authors: Ahmed, Mohsina, Nasar, Abu
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2024; Springer Nature B.V
• Subjects: Adsorbents; Adsorption; Bentonite; Clay; Clay minerals; Dyes; Engineering; Humanities and Social Sciences; Industrial effluents; Iron oxides; multidisciplinary; Research Article-Chemistry; Science; Synthesis; Crystal violet dye; Adsorption; Wastewater treatment; Magnetized bentonite clay
• ISSN: 2193-567X; 1319-8025; 2191-4281
• DOI: 10.1007/s13369-023-08518-w

The present work reports the adsorption of crystal violet dye (CVD) onto magnetized bentonite clay particles (MBCP). The MBCP adsorbent was synthesized by the co-precipitation method, where magnetic particles of Fe
3
O
4
precipitated the bentonite clay particles. The synthesized MBCP showed a high capacity for CVD adsorption, removing 93.97% of the dye at an equilibrium adsorption time of 80 min at an optimum temperature of 303 K. The effects of adsorbent dosage, dye concentration, and pH, on adsorption were also assessed. Adsorption data were best described by the Langmuir adsorption isotherm with a maximum monolayer adsorption capacity of 588.23 mg g
−1
, while the pseudo-second-order kinetic model best fitted the adsorption kinetics. Adsorption was found to be thermodynamically feasible and led to an increase in entropy. The HCl was the most effective desorbing agent for regenerating MBCP up to four cycles. This study of MBCP, therefore, ensures the sustainability and cost-effectiveness of dye treatment in industrial effluents. Further, the magnetization of bentonite mineral clay makes it more effective with enhanced adsorption characteristics along with easy separability.