title: [Study on preparation and spectroscopy of silica-alumina hydrogel and silica from kaolin].
abstract: In our research, silica-alumina hydrogel was prepared by activation with NaOH and reaction with HCl from kaolin, and silica was obtained from the hydrogel by drying and acidifying with HCl. IR, XRD and XRF were used for testing the results, and better result was obtained. The optimal conditions of processing for kaolin 40 g were 15-20 g of sodium hydroxide and 4-5 mol x L(-1) of hydrochloric acid. Finally, preparation processing to get silica, as well as the structure and purity of the resulting silica were characterized by means of IR, XRD and XRF.
authors.affiliation: College of Chemistry and Chemical Engineering, Institute of Biochemical Engineering and Environmental Technology, Lanzhou University, Lanzhou 730000, China.
authors.forename: Yan-feng
authors.initials: YF
authors.lastname: Li
authors.forename: Xiao-bing
authors.initials: XB
authors.lastname: Pan
authors.forename: Gang
authors.initials: G
authors.lastname: Liu
authors.forename: Xue-hu
authors.initials: XH
authors.lastname: Men
authors.forename: Shu-jiang
authors.initials: SJ
authors.lastname: Zhang
authors.forename: Xiao-long
authors.initials: XL
authors.lastname: Wang
mesh_terms: D000537:Aluminum Oxide / Q000032:analysis* / Q000737:chemistry; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry*; D007616:Kaolin / Q000737:chemistry*; D012822:Silicon Dioxide / Q000032:analysis* / Q000737:chemistry; D013052:Spectrometry, X-Ray Emission / Q000379:methods*; D013055:Spectrophotometry, Infrared / Q000379:methods*; D014961:X-Ray Diffraction / Q000379:methods*
chemical_list: D007616:Kaolin; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D012822:Silicon Dioxide; D000537:Aluminum Oxide