title: The synthesis of mesoporous aluminosilicate using microcline for adsorption of mercury(II).
abstract: An economical mesoporous aluminosilicate was synthesized with microcline as starting material and the precursor 13X zeolite as seed for crystal structure on mesoporous walls. In this method, a mixture of microcline and Na2CO3 with a molar ratio of 1:1.05 was first calcined at 1093 K for 2.5 h. The calcined materials were mixed with 35 ml C16TMABr aqueous solution (containing 8.2 g C16TMABr) and the precursors of 13X zeolite, resulting in mesoporous aluminosilicate after crystallization of the solution at 378 K for 48 h and calcination of the powder at 823 K for 5 h. The as-synthesized sample has a uniform pore diameter distribution centered at 3.7 nm. The as-synthesized sample had BET surface area of 725 m2/g and BJH mean pore diameter of 3.7 nm. The FT-IR results revealed that the building units of 13X zeolite were inserted into the pore walls of the as-synthesized sample. The adsorption ratio of mercury(II) onto the as-synthesized adsorbent was about 95%. The adsorption process was found to be spontaneous and can be explained by particle diffusion and chemical ion-exchange mechanisms. The equilibrium concentration of mercury(II) using the as-synthesized sample as the adsorbent was under 1 microg/L, making the concentration of mercury meet the limit for drinking water in China as recommended by the World Health Organization.
authors: National Laboratory of Mineral Materials, China University of Geosciences, Beijing 100083, People's Republic of China. wuxw@cugb.edu.cn
authors: Xiu-Wen
authors: XW
authors: Wu
authors: Hong-Wen
authors: HW
authors: Ma
authors: Jin-Hong
authors: JH
authors: Li
authors: Jun
authors: J
authors: Zhang
authors: Zhi-Hong
authors: ZH
authors: Li
mesh_terms: D000327:Adsorption; D017607:Aluminum Compounds / Q000737:chemistry; D000538:Aluminum Silicates / Q000138:chemical synthesis* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008628:Mercury / Q000302:isolation & purification*; D046529:Microscopy, Electron, Transmission; D017680:Potassium Compounds / Q000737:chemistry; D033362:Powder Diffraction; D017640:Silicates / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D017641:Zeolites / Q000737:chemistry
chemical_list: D017607:Aluminum Compounds; D000538:Aluminum Silicates; D017680:Potassium Compounds; D017640:Silicates; D014874:Water Pollutants, Chemical; D017641:Zeolites; C049037:aluminosilicate; C016024:orthoclase; D008628:Mercury