1. Effective NH2-grafting on mesoporous SBA-15 surface for adsorption of heavy metal ions
- Author
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Zhao, Yanling, Gao, Qiang, Tang, Tao, Xu, Yao, and Wu, Dong
- Subjects
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MESOPOROUS materials , *SURFACES (Technology) , *AMIDES , *HEAVY metal absorption & adsorption , *METAL ion absorption & adsorption , *WATER purification adsorption , *POROSITY - Abstract
Abstract: Utilizing the reactions between toluene diisocyanate (TDI), silanol, and ethylenediamine (EDA), NH2 groups were successfully grafted on mesoporous SBA-15 surface without any destroy to the mesostructure. TDI was employed as a ‘bridge’ molecule whose one NCO group was used to link SBA-15 surface silanols and the other one was left to link EDA. Such NH2-grafting is highly effective for a high loading amount of NH2 groups on SBA-15 because the special stepwise grafting can avoid amino/silanol and amino/amino interactions. Subjected to remove toxic heavy metal ions in aqueous solution, the obtained NH2-SBA-15 showed very high adsorption rates 99.4%, 100%, 99.7%, 98.7% and 99.9% for Cu2+, Zn2+, Cr3+, Ni2+ and Cd2+, respectively, which should be attributed to the strong complexation reactions between metal ions and grafted NH2 groups. [Copyright &y& Elsevier]
- Published
- 2011
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