White nano-titanium organic compound-gel with steady performance was synthesized by sol-gel method. This gel has good absorbency to ultraviolet rays. Specially, the absorption wavelength of the organic gel shifted fro...White nano-titanium organic compound-gel with steady performance was synthesized by sol-gel method. This gel has good absorbency to ultraviolet rays. Specially, the absorption wavelength of the organic gel shifted from 250.9 to 254.3 nm(doped with La) and 257.8 nm(doped with Ce), respectively and the absorption peak broadened. The broadening extent has direct ratio with the doping content. It is indicated that when the thickness of the organic gel coat is 60 μm, 98.8% ultraviolet with radiation intensity of 17.2 μW·cm -2 is blocked off. The TEM test shows that the diameter of the titanium organic gel doped with lanthanum is about 5 nm and the granules are uniform. It is indicated that by X-ray this organic substance is amorphous state and it will form nano-TiO_2 with anatase structure calcined at 450 ℃.展开更多
The bentonite was modified using Ca-bentonite as a matrix and octadecyl/ hexndecyl ammonium chloride as the cover agent, based on hydrothermal process. The organic gel with 5.0 Pa· s viscosity was synthesized by ...The bentonite was modified using Ca-bentonite as a matrix and octadecyl/ hexndecyl ammonium chloride as the cover agent, based on hydrothermal process. The organic gel with 5.0 Pa· s viscosity was synthesized by dispersing it into the dimethyl benzene- methyl alcohol system fully. The optimum process conditions for organic modification were that the coating agent dosage is 22g/ L, reaction time is 90 minutes and the pH value of pulp is 10. X-ray diffraction （ XRD ） analysis indicates that the d （001） value of the modified bentonite is 20. 532 A. The influence of gel temperature on its viscosity characteristic was studied. By analyzing the transmssion electron microscopy （TEM） images and observing the dispersed gel, the nanometer effect of the organic gel was discussed.展开更多
A novel adsorbent （AMPS-silica） was synthesized by bounding AMPS （2-acrylamido-2-methylpropanesulfonic acid） onto silica surface, which functioned with γ-methacryloxypropyltrimethoxysilane reagent. The adsorbent ...A novel adsorbent （AMPS-silica） was synthesized by bounding AMPS （2-acrylamido-2-methylpropanesulfonic acid） onto silica surface, which functioned with γ-methacryloxypropyltrimethoxysilane reagent. The adsorbent was characterized by nitrogen adsorption/desorption measurement, thermogravimetric analysis （TGA） and potentiometric titration analysis. The TGA result indicated that the surface modification reactions introduced some organic functional groups onto the surface of silica. The surface area of AMPSsilica was 389.7 m2/g. The adsorbent was examined for copper ion removal in series of batch adsorption experiments. Results showed that the adsorption of Cu2＋ onto AMPS-silica was pH dependent, and the adsorption capacity increased with increasing pH from 2 to 6. The adsorption kinetics showed that Cu^2＋ adsorption was fast and the data fitted well with a pseudo secondorder kinetic model. The adsorption of Cu^2＋ onto AMPS-silica obeyed both Freundlich and Langmuir isotherms, with r^2 = 0.993 and r^2 = 0.984, respectively. The maximum Cu^2＋ adsorption capacity was 19.9 mg/g. The involved mechanism might be the adsorption through metal binding with organic functional groups such as carboxyl, amino and sulfonic groups. Cu^2＋ loaded on AMPS-silica could be desorbed in HNO3 solution, and the adsorption properties remain stable after three adsorption-desorption cycles.展开更多
文摘White nano-titanium organic compound-gel with steady performance was synthesized by sol-gel method. This gel has good absorbency to ultraviolet rays. Specially, the absorption wavelength of the organic gel shifted from 250.9 to 254.3 nm(doped with La) and 257.8 nm(doped with Ce), respectively and the absorption peak broadened. The broadening extent has direct ratio with the doping content. It is indicated that when the thickness of the organic gel coat is 60 μm, 98.8% ultraviolet with radiation intensity of 17.2 μW·cm -2 is blocked off. The TEM test shows that the diameter of the titanium organic gel doped with lanthanum is about 5 nm and the granules are uniform. It is indicated that by X-ray this organic substance is amorphous state and it will form nano-TiO_2 with anatase structure calcined at 450 ℃.
基金Funded by the Foundation Research Programof China NationalPetroleumCorporation (No.03A50504)
文摘The bentonite was modified using Ca-bentonite as a matrix and octadecyl/ hexndecyl ammonium chloride as the cover agent, based on hydrothermal process. The organic gel with 5.0 Pa· s viscosity was synthesized by dispersing it into the dimethyl benzene- methyl alcohol system fully. The optimum process conditions for organic modification were that the coating agent dosage is 22g/ L, reaction time is 90 minutes and the pH value of pulp is 10. X-ray diffraction （ XRD ） analysis indicates that the d （001） value of the modified bentonite is 20. 532 A. The influence of gel temperature on its viscosity characteristic was studied. By analyzing the transmssion electron microscopy （TEM） images and observing the dispersed gel, the nanometer effect of the organic gel was discussed.
基金supported by the Fundation for Creative Research Groups of China (No. 50621804)
文摘A novel adsorbent （AMPS-silica） was synthesized by bounding AMPS （2-acrylamido-2-methylpropanesulfonic acid） onto silica surface, which functioned with γ-methacryloxypropyltrimethoxysilane reagent. The adsorbent was characterized by nitrogen adsorption/desorption measurement, thermogravimetric analysis （TGA） and potentiometric titration analysis. The TGA result indicated that the surface modification reactions introduced some organic functional groups onto the surface of silica. The surface area of AMPSsilica was 389.7 m2/g. The adsorbent was examined for copper ion removal in series of batch adsorption experiments. Results showed that the adsorption of Cu2＋ onto AMPS-silica was pH dependent, and the adsorption capacity increased with increasing pH from 2 to 6. The adsorption kinetics showed that Cu^2＋ adsorption was fast and the data fitted well with a pseudo secondorder kinetic model. The adsorption of Cu^2＋ onto AMPS-silica obeyed both Freundlich and Langmuir isotherms, with r^2 = 0.993 and r^2 = 0.984, respectively. The maximum Cu^2＋ adsorption capacity was 19.9 mg/g. The involved mechanism might be the adsorption through metal binding with organic functional groups such as carboxyl, amino and sulfonic groups. Cu^2＋ loaded on AMPS-silica could be desorbed in HNO3 solution, and the adsorption properties remain stable after three adsorption-desorption cycles.
