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
College of Science, Chemistry Department, Al Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 11623, Kingdom of Saudi Arabia.
Department of Civil and Environmental Engineering, Wayne State University, 5050 Anthony Wayne Drive, Detroit, MI, 48202, USA.
Chemosphere. 2023 Nov;341:140062. doi: 10.1016/j.chemosphere.2023.140062. Epub 2023 Sep 8.
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 Hg onto MTA/CS composite were inspected, which suggested that the MTA/CS composite exhibited great sorption properties for Hg in liquid solutions. The maximal Hg sorption capacity was 195 mg/g. The effects of temperature, Hg 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 Hg adsorption process onto the MTA/CS composite is exothermic and occurred spontaneously. The desorption condition of Hg from its loaded MTA/CS was also gained. Likewise, the MTA/CS sorbent was undoubtedly regenerated by 0.8 M NaNO 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 Hg from liquid solutions.
汞是一种有毒的环境元素，因此有必要制备一种新型、高效、廉价的吸附剂来去除它。通过一种简单的策略制备了介孔硫代乙酰胺/壳聚糖（MTA/CS）；将几丁质脱乙酰化以获得壳聚糖（CS）并添加硫代乙酰胺。使用X射线衍射、能谱分析、扫描电子显微镜、傅里叶变换红外光谱和比表面积分析对所制备的MTA/CS进行了表征。根据研究结果，成功合成了MTA/CS。考察了汞在MTA/CS复合材料上的去除行为，结果表明MTA/CS复合材料在液体溶液中对汞具有良好的吸附性能。最大汞吸附容量为195 mg/g。分析了温度、汞浓度、接触时间和MTA/CS浓度对吸附的影响。二级模型和朗缪尔等温线适用于该物理化学吸附过程。热力学分析表明，汞在MTA/CS复合材料上的吸附过程是放热的且自发进行。还获得了汞从负载的MTA/CS上的解吸条件。同样，MTA/CS吸附剂通过0.8 M NaNO3在80分钟接触时间和1:50的固液比下无疑可以再生。通过九个吸附-萃取循环研究了MTA/CS吸附剂的通用性和耐久性。将最佳参数应用于废水处理。基于结果，所制备的MTA/CS可能是一种从液体溶液中去除汞的潜在吸附剂。
