Department of Chemistry, College of sciences and art, Dhahran Aljounb, King Khalid University, Saudi Arabia.
Department of Chemistry, Faculty of Sciences, Umm Al-Qura University, Makkah, Saudi Arabia.
Int J Biol Macromol. 2024 Feb;259(Pt 2):129282. doi: 10.1016/j.ijbiomac.2024.129282. Epub 2024 Jan 9.
The objective of this research was to develop a novel adsorbent to eliminate mercury (Hg(II)) from water. A unique citrate-crosslinked La-MOF/citrate crosslinked chitosan composite sponge (La-MOF@CSC composite sponge) was successfully synthesized in an acidic environment using a one-step technique. Modifying the composition of adsorbent materials is a commonly employed strategy to enhance adsorption capacity, particularly for materials composed of metal-organic frameworks. The study investigated the impact of the composite sponge on the adsorption and removal of Hg(II). The composite sponge exhibited a maximum adsorption capacity (q) for Hg(II) at 765.22 mg/g and an impressive high surface area of 1208 m/g. Various factors influencing the adsorption capacity were taken into account in this study. The adsorption isotherm and kinetics were modeled using Langmuir and pseudo-second-order equations, respectively. Consistent with thermodynamics, the adsorption process was identified as spontaneous and endothermic. The quantities of adsorbed substances increased with rising temperature. The La-MOF@CSC composite sponge demonstrated the ability to be reused up to five times with satisfactory efficiency, retaining its chemical composition and exhibiting similar XRD and XPS data before and after each reuse. The interaction between heavy metals and the La-MOF/CSC composite sponge was examined. Optimization of the adsorption outcomes was conducted using the Box-Behnken design (BBD).
本研究旨在开发一种新型吸附剂，以去除水中的汞（Hg(II)）。采用一步法，在酸性环境中成功合成了一种独特的柠檬酸酸交联镧-MOF/柠檬酸酸交联壳聚糖复合海绵（La-MOF@CSC 复合海绵）。通过改变吸附材料的组成来提高吸附能力是一种常用的策略，尤其是对于金属有机骨架组成的材料。本研究探讨了复合海绵对 Hg(II)吸附和去除的影响。复合海绵对 Hg(II)的最大吸附容量（q）为 765.22 mg/g，具有令人印象深刻的 1208 m/g 高表面积。本研究考虑了影响吸附容量的各种因素。吸附等温线和动力学分别采用 Langmuir 和准二级方程进行模拟。与热力学一致，吸附过程被确定为自发和吸热的。吸附物质的数量随温度的升高而增加。La-MOF@CSC 复合海绵表现出可重复使用五次的能力，效率令人满意，在每次重复使用前后均保留其化学成分，并表现出相似的 XRD 和 XPS 数据。研究了重金属与 La-MOF/CSC 复合海绵之间的相互作用。采用 Box-Behnken 设计（BBD）对吸附结果进行了优化。
