Physicochemical investigation of mercury sorption on mesoporous thioacetamide/chitosan from wastewater

• Published in: Chemosphere (Oxford) Vol. 341; p. 140062
• Main Authors: Eissa, Mohamed E., Sakr, Ahmed K., Hanfi, Mohamed Y., Sayyed, M.I., Al‐Otaibi, Jamelah S., Abdel-lateef, Ashraf M., Cheira, Mohamed F., Abdelmonem, Haeam A.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2023
• Subjects: Chitosan; Mercury; Mesoporous sorbent; Sorption; Thioacetamide; Wastewater; Sorption; Thioacetamide; Chitosan; Wastewater; Mercury; Mesoporous sorbent
• ISSN: 0045-6535; 1879-1298; 1879-1298
• DOI: 10.1016/j.chemosphere.2023.140062

Mercury is a toxic environmental element, so it was necessary to prepare a new, highly efficient, cheap sorbent to remove it. A mesoporous thioacetamide/chitosan (MTA/CS) was manufactured via a simplistic strategy; the chitin deacetylation to gain chitosan (CS) and the addition of thioacetamide. The as-prepared MTA/CS was characterized using X-ray diffraction, EDX, SEM, FTIR, and BET surface analysis. According to the findings, the MTA/CS was effectively synthesized. The removal behaviors of Hg2+ onto MTA/CS composite were inspected, which suggested that the MTA/CS composite exhibited great sorption properties for Hg2+ in liquid solutions. The maximal Hg2+ sorption capacity was 195 mg/g. The effects of temperature, Hg2+ concentration, contacting time, and MTA/CS concentration on sorption were analyzed. The 2nd-order model and Langmuir isotherm were suitable for the physicochemical adsorption processes. Thermodynamic analysis showed that the Hg2+ adsorption process onto the MTA/CS composite is exothermic and occurred spontaneously. The desorption condition of Hg2+ from its loaded MTA/CS was also gained. Likewise, the MTA/CS sorbent was undoubtedly regenerated by 0.8 M NaNO3 80 min contacting and 1:50 S:L ratio. The versatility and durability of MTA/CS sorbent were investigated via nine sorption-extraction cycles. The optimum parameters were applied to wastewater. Based on the result, the as-prepared MTA/CS might be a potential sorbent for removing Hg2+ from liquid solutions. [Display omitted] •Chitosan can be functionalized by thioacetamide to prepare thioacetamide/chitosan (MTS/CS).•Thioacetamide/chitosan has high affinity to absorb Hg2+ ions from wastewater.•The maximum sorption capacity of Hg2+ on MTA/CS is 195 mg/g.•The sorption process implies the 2nd-order model and Langmuir isotherm.•The desorption of Hg2+ ions is conducted by 0.8 M NaNO3, 80 min, and 1:50 S:L ratio.