Pérez-Quintanilla D, Del Hierro I, Fajardo M, Sierra I
Departamento de Tecnología Química y Ambiental, E.S.C.E.T, Universidad Rey Juan Carlos, C/ Tulipán s/n, 28933, Móstoles, Madrid, Spain.
J Environ Monit. 2006 Jan;8(1):214-22. doi: 10.1039/b507983g. Epub 2005 Nov 9.
Mesoporous silicas (SBA-15 and MCM-41) have been functionalized by two different methods. Using the heterogeneous route the silylating agent, 3-chloropropyltriethoxysilane, was initially immobilized onto the mesoporous silica surface to give the chlorinated mesoporous silica Cl-SBA-15 or Cl-MCM-41. In a second reaction a multifunctionalized N,S donor compound (2-mercaptobenzothiazol) was incorporated to obtain the functionalized silicas denoted as MBT-SBA-15-Het and MBT-MCM-41-Het. Using the homogeneous route, the functionalization was achieved via the one step reaction of the mesoporous silica with an organic ligand containing the chelating functions, to give the modified mesoporous silicas denoted as MBT-SBA-15-Hom or MBT-MCM-41-Hom. The functionalized mesoporous silicas were employed as adsorbents for the regeneration of aqueous solutions at pH 6 contaminated with Hg(ii) at room temperature. Results obtained indicate that mercury adsorption was higher in the mesoporus silicas prepared by the homogeneous method, and the maximum adsorption value (0.24 +/- 0.02 mmol Hg(ii) g(-1)) was obtained for MBT-SBA-15-Hom. The chemically stability in acid medium of the functionalized silicas, possibility its regeneration washing with concentrate HCl, resulting in the reuse of the adsorbent material for several cycles.
介孔二氧化硅（SBA - 15和MCM - 41）已通过两种不同方法进行功能化。采用非均相路线时，先将硅烷化剂3 - 氯丙基三乙氧基硅烷固定在介孔二氧化硅表面，得到氯化介孔二氧化硅Cl - SBA - 15或Cl - MCM - 41。在第二步反应中，引入多功能N，S供体化合物（2 - 巯基苯并噻唑），以获得标记为MBT - SBA - 15 - Het和MBT - MCM - 41 - Het的功能化二氧化硅。采用均相路线时，通过介孔二氧化硅与含有螯合功能的有机配体一步反应实现功能化，得到标记为MBT - SBA - 15 - Hom或MBT - MCM - 41 - Hom的改性介孔二氧化硅。功能化介孔二氧化硅用作吸附剂，用于在室温下再生被Hg(ii)污染的pH为6的水溶液。所得结果表明，通过均相法制备的介孔二氧化硅对汞的吸附更高，MBT - SBA - 15 - Hom的最大吸附值为(0.24 ± 0.02 mmol Hg(ii) g⁻¹)。功能化二氧化硅在酸性介质中的化学稳定性良好，有可能用浓盐酸洗涤再生，从而使吸附剂材料可重复使用几个循环。
