Remove of titanium （Ti） from titanium-pillared montmorillont （TIPM） is not expected during its application as adsorbent and photocatalyst, etc. But studies on immobilization of Ti on TIPM are seldom reported. In t...Remove of titanium （Ti） from titanium-pillared montmorillont （TIPM） is not expected during its application as adsorbent and photocatalyst, etc. But studies on immobilization of Ti on TIPM are seldom reported. In this work, TIPM was synthesized from TIC14 and Na＋-montmorillont （Na＋-MMT）. Then the prepared TIPM was heated at different temperatures （100, 240 and 450 ~C） to yield three TIPM samples （TIPM1, TIPM2, and TIPM3）. Inductively coupled plasma optical emission spectrometer （ICP-OES） was used to determine the effect of heating temperature on the remaining amount of Ti on TIPMs. A two-step treatment method which is often used in the pretreatment and application of TIPM was developed to investigate the immobile character of Ti on TIPMs. X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FT-IR）, N2 adsorption/desorption isotherm, thermogra- vimetric analysis and differential scanning calorimetry （TG-DSC） were also used to characterize TIPMs before and after the treatment. The results show that with an increase in heating temperature, the amount of Ti species re- mained on T1PM decreases gradually and Ti immobilization is strengthened on TIPM. For TIPM3, less than 2% Ti is removed from TIPM3 after the treatment required to simulate the practical conditions of TIPM in its application, while those of TIPM1 and TIPM2 are 6.6% and 8.4%, respectively. The reason may be that when TIPM is heated, Ti species intercalated into MMT become chemically bonded with the framework of MMT and partially migrate into the layer structure, which make Ti immobile on TIPM firmly during the treatment process.展开更多
利用四氯化钛为前驱体,制备了不同氟掺杂量的钛柱撑蒙脱石。通过X射线衍射、傅立叶转换红外光谱、透射电子显微镜及比表面积、孔隙度分析等手段对材料结构进行表征,并考察了不同氟掺杂量的钛柱撑蒙脱石对饮用水中微量砷的吸附作用。结...利用四氯化钛为前驱体,制备了不同氟掺杂量的钛柱撑蒙脱石。通过X射线衍射、傅立叶转换红外光谱、透射电子显微镜及比表面积、孔隙度分析等手段对材料结构进行表征,并考察了不同氟掺杂量的钛柱撑蒙脱石对饮用水中微量砷的吸附作用。结果表明,氢氟酸掺杂量为20 m L的20HF-Ti-MMT形成了钛柱撑结构,材料中的锐钛矿型二氧化钛颗粒粒度分布均匀,结晶度好,材料颗粒均匀,晶型完整,稳定性良好,由于比表面积大和表面羟基含量多等特点对饮用水中微量砷的吸附效果较佳,砷吸附率最高为99.76%。展开更多
文摘Remove of titanium （Ti） from titanium-pillared montmorillont （TIPM） is not expected during its application as adsorbent and photocatalyst, etc. But studies on immobilization of Ti on TIPM are seldom reported. In this work, TIPM was synthesized from TIC14 and Na＋-montmorillont （Na＋-MMT）. Then the prepared TIPM was heated at different temperatures （100, 240 and 450 ~C） to yield three TIPM samples （TIPM1, TIPM2, and TIPM3）. Inductively coupled plasma optical emission spectrometer （ICP-OES） was used to determine the effect of heating temperature on the remaining amount of Ti on TIPMs. A two-step treatment method which is often used in the pretreatment and application of TIPM was developed to investigate the immobile character of Ti on TIPMs. X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FT-IR）, N2 adsorption/desorption isotherm, thermogra- vimetric analysis and differential scanning calorimetry （TG-DSC） were also used to characterize TIPMs before and after the treatment. The results show that with an increase in heating temperature, the amount of Ti species re- mained on T1PM decreases gradually and Ti immobilization is strengthened on TIPM. For TIPM3, less than 2% Ti is removed from TIPM3 after the treatment required to simulate the practical conditions of TIPM in its application, while those of TIPM1 and TIPM2 are 6.6% and 8.4%, respectively. The reason may be that when TIPM is heated, Ti species intercalated into MMT become chemically bonded with the framework of MMT and partially migrate into the layer structure, which make Ti immobile on TIPM firmly during the treatment process.
文摘利用四氯化钛为前驱体,制备了不同氟掺杂量的钛柱撑蒙脱石。通过X射线衍射、傅立叶转换红外光谱、透射电子显微镜及比表面积、孔隙度分析等手段对材料结构进行表征,并考察了不同氟掺杂量的钛柱撑蒙脱石对饮用水中微量砷的吸附作用。结果表明,氢氟酸掺杂量为20 m L的20HF-Ti-MMT形成了钛柱撑结构,材料中的锐钛矿型二氧化钛颗粒粒度分布均匀,结晶度好,材料颗粒均匀,晶型完整,稳定性良好,由于比表面积大和表面羟基含量多等特点对饮用水中微量砷的吸附效果较佳,砷吸附率最高为99.76%。
