| Paying a special attention to adsorption and separation applications of mesoporous materials, we synthesized a novel, efficient and green adsorbent and applied in the metal elements adsorption. In this thesis, cysteine-modified mesoporous silica material was synthesized and characterized, as well as the adsorption properties of the material in the heavy metals and rare earth elements were experimented. The adsorption conditions of mercury ions were optimized and the method of detection of trace mercury combined with inductively coupled plasma atomic emission spectroscopy was developed. The selective adsorption properties of rare earth elements of the material were investigated, and the adsorption time and elution conditions also were tested.A novel L-cysteine functionalized SBA-15composite was synthesized firstly by post-grafted. We found that the pore size and specific surface area of modified material have been reduced, but it still keeps the orderly pore structure; On the other hand, the introduction of cysteine into the surface of SBA-15was confirmed. The material shows excellent mercury adsorption capacity of429mg/g at room temperature, and uptake time for mercury is less than5min. It obtained satisfactory results by combined with ICP-AES for detection of trace mercury ions.The selective adsorption of rare earth elements on cysteine modified mesoporous silica materials was investigated. When pH=5, cysteine modified SBA-15can selectively adsorb Th only, but it can add up to Sc, Th and U at pH=7. However, all the rare earth elements are adsorbed under alkaline condition. Meanwhile, it can reach equilibrium within2minutes, and it is able to achieve100%elution only by1mol/L HCl. |
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