Pérez-Quintanilla Damián, Sánchez Alfredo, del Hierro Isabel, Fajardo Mariano, Sierra Isabel
Departamento de Química Inorgánica y Analítica, E.S.C.E.T, Universidad Rey Juan Carlos, C/Tulipán s/n, 28933 Móstoles, Madrid, Spain.
J Nanosci Nanotechnol. 2009 Aug;9(8):4901-9. doi: 10.1166/jnn.2009.1106.
Submicron particles of mesoporous MSU-2 silica have been obtained by using Tergitol NP-9 as nonionic surfactant and TEOS as silica precursor. The material has been chemically modified with 5-mercapto-1-methyltetrazole and characterized by powder X-ray diffraction, TEM, SEM, N2 adsorption, FT-IR spectroscopy, 29Si-NMR spectroscopy, thermogravimetric analysis and elemental analysis. The enviromental application of such material (denoted MTTZ-MSU-2b) in the treatment of heavy metal-contaminated waters has been demonstrated. The maximum adsorption capacity of this material was found to be 0.73 +/- 0.01 mmol/g for Pb(II) and 0.94 +/- 0.01 mmol/g for Zn(II), and is higher than the capacity of most of the other functionalized mesoporous materials previously reported. The very high access of these metal ions to the binding sites in the adsorbent has also been demonstrated (adsorption efficiency equal to 0.88 and 1.13 for Pb(II) and Zn(II), respectively).
通过使用壬基酚聚氧乙烯醚（Tergitol NP - 9）作为非离子表面活性剂和正硅酸乙酯（TEOS）作为硅源前驱体，制备出了介孔MSU - 2二氧化硅的亚微米颗粒。该材料用5 - 巯基 - 1 - 甲基四氮唑进行了化学修饰，并通过粉末X射线衍射、透射电子显微镜（TEM）、扫描电子显微镜（SEM）、N₂吸附、傅里叶变换红外光谱（FT - IR）、²⁹Si - 核磁共振光谱（²⁹Si - NMR）、热重分析和元素分析进行了表征。已证明这种材料（记为MTTZ - MSU - 2b）在处理重金属污染水体方面的环境应用。发现该材料对Pb(II)的最大吸附容量为0.73±0.01 mmol/g，对Zn(II)的最大吸附容量为0.94±0.01 mmol/g，高于先前报道的大多数其他功能化介孔材料的容量。还证明了这些金属离子对吸附剂中结合位点的极高可达性（Pb(II)和Zn(II)的吸附效率分别为0.88和1.13）。
