The performance and kinetics of flower-like MoS2 for Hg2+ removal from acidic wastewater

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) Vol. 132; pp. 552 - 560
• Main Authors: Ma, Yongpeng, Gu, Wentao, Shi, Chaobin, Zhang, Xiaojing, Han, Lifeng, Liu, Nan, Luo, Tang, Zhang, Hongzhong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.04.2024; 한국공업화학회
• Subjects: Acidic wastewater; Adsorption; Mercury removal; Molybdenum disulfide; Sulfide; 화학공학; Sulfide; Mercury removal; Molybdenum disulfide; Adsorption; Acidic wastewater
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2023.11.050

[Display omitted] In this study, flower-like MoS2 was synthesized under non-equilibrium conditions for effectively absorbing Hg2+ from acidic wastewater. The prepared flower-like MoS2 was characterized using XRD, FESEM, BET, and EDS analyses. The effects of initial concentration of Hg2+, pH, temperature, and common anions on the adsorption performance of flower-like MoS2 were investigated. The results showed that the removal of Hg2+ from a solution with the initial concentration of 200 mg/L Hg2+ was close to 100 % within 60 min. The maximum adsorption capacity was 1790 mg/g at 25 °C. The regression coefficient for the adsorption of Hg2+ conformed to the pseudo second-order kinetics, and the adsorption isotherm was more consistent with Langmuir model, indicating that the removal of Hg2+ using flower-like MoS2 was through monolayer adsorption. The reaction activation energy for the adsorption of Hg2+ by flower-like MoS2 was 26.89 kJ/mol, which again verified that the synthesized material was a fast and efficient adsorption material. Based upon the results, it is inferred that the flower-like MoS2 has a high ability for removing Hg2+ from wastewater and therefore, exhibits broad application prospects.