Co-codensation Synthesis Of L-cysteine Functionalized Mesoporous Silica Material And Its Adsorption Of Mercury Of Mercury In Aqeous

In recent years, increasingly severe environmental pollution, especially heavy metal pollution,not only has severely damaged the ecological environment, but also has caused great harm forhumans and other organisms. Adsorption is often used to remove metal in water, and the adsorbentmaterial used is the core of the technology. Therefore, the synthesis of efficient, green newadsorbent is of significant importance. Among the methods of removing Hg (II) from aqueous, theadsorption method is the most effective and low cost one. Mesoporous silica is one of the mostattractive mesoporous adsorbents because of its high specific surface area, regular and tunablepore size, and most importantly is that it can be modified on the surface so that different functiongroups can be grafted to get different adsorption properties. In this regard, ordered mesoporousmaterials may offer a promising solution of adsorbing Hg in aqueous. The adsorption properties ofHg depend on the functional group(s) on their surfaces such as thiol, thiourea, and thioethergroups because research has shown that adsorbents containing sulfur-based ligands effectivelyform complexes with mercury ions.Paying a special attention to adsorption and separation applications of mesoporous materials,we synthesized a novel, efficient and green adsorbent and applied in the heavy metal elementsadsorption. In this paper, cysteine-modified mesoporous silica material was synthesized andcharacterized, as well as the adsorption properties of the material in the heavy metals wereexperimented. The adsorption conditions of mercury ions were optimized.A novel L-cysteine functionalized SBA-15composite was synthesized firstly by one-stepmethod. The pore size and specific surface area of modified material have been reduced, but it stillkeeps the orderly pore structure; On the other hand, the grafting of cysteine into the surface of SBA-15was confirmed. The material shows excellent mercury adsorption capacity of135mg/g atroom temperature, and uptake time for mercury is less than2min. The material has thepotentiality of application in the analysis of mercury in aqueous solution.