In order to obtain anatase TiO2/expanded graphite with high expansion volume, titania gel was introduced to expandable graphite surface by sol-gel process, and then the composite was expanded and calcined at high temp...In order to obtain anatase TiO2/expanded graphite with high expansion volume, titania gel was introduced to expandable graphite surface by sol-gel process, and then the composite was expanded and calcined at high tempera- ture. The samples were analysed by using scanning electron microscope （SEM）, X-ray diffraction（XRD）, energy disperse spectroscopy （EDS）, and differential scanning calorimetry （DSC）. The optimal conditions for preparation are as follows： the molar ratio of tetrabutyl orthotitanate to triethanolamine is 1 ： 0.4, and the calcination and expansion temperature is in the range of 650--750 ~C. Under such conditions, the expansion volume of composites could reach 98 mE/g, and the mass loss ratio is less than 5%. The analysis shows that lower temperature and smaller particle size of graphite are helpful to the formation of anatase-type of TiO2, but larger particle size will lead to lower mass loss ratio, and higher temperature and larger particle size will lead to higher expansion volume.展开更多
化学氧化法制备了负载氧化钛的可膨胀石墨(Graphite intercalation compounds loaded with titanium oxide,TGICs),考察了其热处理温度对所制得负载二氧化钛膨胀石墨TEG膨胀体积和对直接深蓝C-3R(Direct deep blue,DDB)脱色性能的影响....化学氧化法制备了负载氧化钛的可膨胀石墨(Graphite intercalation compounds loaded with titanium oxide,TGICs),考察了其热处理温度对所制得负载二氧化钛膨胀石墨TEG膨胀体积和对直接深蓝C-3R(Direct deep blue,DDB)脱色性能的影响.DDB脱色的热力学实验表明:TEG-900对DDB的脱色率随溶液离子强度的增加而增大,随DDB初始质量浓度的增加而降低;而TEG-900对DDB的吸附去除量和二氧化钛紫外光催化去除量均随DDB初始质量浓度的增加而增大;该脱色过程可以用Freundlich方程很好的拟合.脱色动力学实验表明:TEG-900在紫外光照射下对DDB的脱色过程可以用Langmuir-Hinshelwood动力学模型模拟.展开更多
基金Supported by Applied Basic Research Project of Sichuan Province (No.2006J13-014)Innovation Fund of Panzhihua University
文摘In order to obtain anatase TiO2/expanded graphite with high expansion volume, titania gel was introduced to expandable graphite surface by sol-gel process, and then the composite was expanded and calcined at high tempera- ture. The samples were analysed by using scanning electron microscope （SEM）, X-ray diffraction（XRD）, energy disperse spectroscopy （EDS）, and differential scanning calorimetry （DSC）. The optimal conditions for preparation are as follows： the molar ratio of tetrabutyl orthotitanate to triethanolamine is 1 ： 0.4, and the calcination and expansion temperature is in the range of 650--750 ~C. Under such conditions, the expansion volume of composites could reach 98 mE/g, and the mass loss ratio is less than 5%. The analysis shows that lower temperature and smaller particle size of graphite are helpful to the formation of anatase-type of TiO2, but larger particle size will lead to lower mass loss ratio, and higher temperature and larger particle size will lead to higher expansion volume.
文摘化学氧化法制备了负载氧化钛的可膨胀石墨(Graphite intercalation compounds loaded with titanium oxide,TGICs),考察了其热处理温度对所制得负载二氧化钛膨胀石墨TEG膨胀体积和对直接深蓝C-3R(Direct deep blue,DDB)脱色性能的影响.DDB脱色的热力学实验表明:TEG-900对DDB的脱色率随溶液离子强度的增加而增大,随DDB初始质量浓度的增加而降低;而TEG-900对DDB的吸附去除量和二氧化钛紫外光催化去除量均随DDB初始质量浓度的增加而增大;该脱色过程可以用Freundlich方程很好的拟合.脱色动力学实验表明:TEG-900在紫外光照射下对DDB的脱色过程可以用Langmuir-Hinshelwood动力学模型模拟.
