Thermal oxidation synthesis of MoS 2 /MoO 3 composites for cationic dye adsorption

• Published in: New journal of chemistry 2024-11, Vol.48 (46), p.19638-19649
• Main Authors: de Almeida, Jéssica Cristina, Rodrigues, Thais Aparecida, de Souza, Thais Mota, Del Duque, Douglas M. S., Giraldi, Tânia Regina, de Mendonça, Vagner R.
• Format: Article
• Language: English
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/D4NJ03363A

This study investigates the influence of synthesis parameters on the preparation of MoS 2 /MoO 3 composites and their adsorption performance for methylene blue (MB) dye removal. The research gap is based on searching for easily obtainable materials with high adsorption capacity. A 2 k factorial design with a central point was employed to optimize the synthesis conditions, focusing on calcination temperature and time. The synthesized materials were characterized, revealing the MoS 2 /MoO 3 composition at the calcination temperature of 300 °C, with varying calcination times. In particular, the sample treated at 300 °C for 23 minutes (S-300/23) demonstrated the highest maximum adsorption capacity, reaching 505.1 mg g −1 . The adsorption isotherm and kinetics were also evaluated, fitting with Langmuir and pseudo-first-order models, indicating monolayer adsorption and physisorption as the dominant mechanism, respectively. This study highlights the potential of MoS 2 /MoO 3 composites as efficient adsorbents for MB dye removal. The optimized synthesis conditions enable the production of this composite adsorbent in a single step under mild conditions. This efficiency and ease of production highlight its potential for further investigation.