Hectorite-CTAB-alginate composite beads for water treatment: kinetic, isothermal and thermodynamic studies

• Published in: RSC advances Vol. 13; no. 2; pp. 79 - 81
• Main Authors: Asranudin, Holilah, Purnomo, Adi Setyo, Bahruji, Hasliza, Allouss, Dalia, El Alaoui-Elbalrhiti, Ilias, Subagyo, Riki, Rohmah, Alya Awinatul, Prasetyoko, Didik
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 03-01-2023
• Subjects: Adsorbents; Adsorption; Alginates; Aqueous solutions; Beads; Dyes; Kinetics; Stability analysis; Thermal stability; Thermodynamics; Thermogravimetric analysis; Wastewater treatment; Water treatment
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/d2ra06934b

Encapsulation of hectorite-modified CTAB with Ca-alginate formed reusable adsorbent beads for wastewater treatment. The thermogravimetric analysis (TGA) investigation indicated excellent thermal stability results for BHec-40 compared to Hec-40. Although the mesoporous surface area of BHec-40 decreased to 79.74 m
2
g
−1
compared to 224.21 m
2
g
−1
for Hec-40, the hectorite-CTAB-alginate beads showed high adsorption capacity and stability for methyl orange (MO) adsorption with more than 60% removal after five adsorption-desorption cycles. The influence of pH (3-11), temperature (30, 40, and 50 °C), initial concentration (50-400 mg L
−1
), and contact time were studied to obtain the kinetics and thermodynamics of adsorption. The outcomes revealed a maximum monolayer adsorption capacity of 117.71 mg g
−1
for BHec-40. The kinetics of adsorption demonstrated the suitability of using the pseudo-first-order kinetic model, while the equilibrium adsorption data follows the Langmuir isotherm. Thermodynamic analysis indicates physisorption of MO onto BHec-40. BHec-40 improves the reusability as an adsorbent for the removal of anionic dyes from aqueous media.
Encapsulation of hectorite-modified CTAB with Ca-alginate formed reusable adsorbent beads for wastewater treatment.