中空介孔二氧化硅锚固聚偕胺肟吸附Cr(Ⅵ)

以硝酸铈铵为引发剂,在自制的中空介孔二氧化硅(HMS)的空腔和通道内引发丙烯腈自由基聚合,并将其氰基偕胺肟化,用于制备具有吸附Cr(Ⅵ)的廉价有机无机复合吸附材料——中空介孔二氧化硅锚固聚偕胺肟.通过傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)及N_2吸附-脱附比表面分析对中空介孔二氧化硅锚固聚偕胺肟进行表征.结果表明,制备的中空微球直径约为400 nm,其壁上孔径约为11.0 nm,比表面积约为431 m~2/g,锚固聚偕胺肟后中空微球壁上孔道直径约为4.6 nm,比表面积降低为347 m~2/g.HMS锚固的聚偕胺肟对重铬酸钾溶液中铬的吸附量高达0.46 mmol/g,吸附过程中伴随化学反应,符合伪二级动力学模型,可用作废水处理中重金属离子的高效廉价吸附材料.

Polyamidoximation of Hollow Mesoporous Silica and Its Application in Adsorption of Cr(Ⅵ)?

Polyamidoximation of hollow mesoporous silica ( HMS/PAO ) was prepared by tranforming the cyano groups in polyacrylonitrile grafted from hollow mesoporous silica ( HMS ) through polymerization of acrylonitrile initiated by ceric ammonium nitrate. The hollow mesoporous silica was prepared by a facile one-pot sol-gel method. The microstructure and characteristic of the HMS and HMS/PAO were examined by Fourier transform Infrared spectra ( FTIR ) , X-ray diffraction, scanning electron microscope ( SEM ) , N2 adsorption desorption isotherm. The results showed that the diameter of the HMS was about 400 nm, and the size of the mesoporous was ca. 11. 0 nm. The size of the mesoporous was ca. 4. 6 nm and more uniform and smaller. As potassium dichromate solution( K2 Cr2 O7 ) was used as a target solution for detecting adsorption ca-pacity of the prepared HMS/PAO, the adsorption chromium kinetics was consistent with the pseudo-second-order kinetics model by analyzing the adsorption amount as a function of the sorbent dispersed duration in solu-tion at pH=2. 0. The adsorption capacity of HMS/PAO for chromium was as much as 0. 46 mmol/g. There-fore, it is an adsorbent with high efficiency.