采用分散剂对钛白粉进行了物理包覆,显著提升了钛白粉在水中的分散性能。同时,分析了钛白粉的自分散机理,并从产品应用的角度对其进行了系统评价,实验发现:经过分散剂表面包覆后粉体的Zeta(ζ)电位由-61.98 m V提升至-69.17 m V,分散液...采用分散剂对钛白粉进行了物理包覆,显著提升了钛白粉在水中的分散性能。同时,分析了钛白粉的自分散机理,并从产品应用的角度对其进行了系统评价,实验发现:经过分散剂表面包覆后粉体的Zeta(ζ)电位由-61.98 m V提升至-69.17 m V,分散液吸光值由0.102提升至0.358,沉降实验清水层明显减少,说明钛白粉的自分散性和分散稳定性得到提升;另外,采用改性钛白粉制备的色浆与未改性钛白粉制备的色浆相比分散剂用量由6%降至2%,放置黏度变化小,说明改性包覆能够实现粉体的自动解絮凝能力。展开更多
A new composite photocatalyst of modified oyster shell powder/Ce-N-TiO<sub>2</sub> was prepared by sol-gel method. Based on single factor experiment, Ce doping rate, N doping rate and calcination temperatu...A new composite photocatalyst of modified oyster shell powder/Ce-N-TiO<sub>2</sub> was prepared by sol-gel method. Based on single factor experiment, Ce doping rate, N doping rate and calcination temperature were taken as input variables. Based on the central composite design (BBD) response surface model, two functional relationship models between three independent variables and glyphosate removal rate were established to evaluate the influence degree of independent variables and interaction on catalyst. The significance of the model and regression coefficient was tested by variance analysis. The analysis of the obtained data showed that the degradation performance of the composite photocatalyst was significantly affected by the calcination temperature and the rate of N doping, while the rate of Ce doping had little effect;at the calcination temperature of 505.440°C, the degradation rate of glyphosate reached the maximum of 82.15% under the preparation conditions of 17.057 mol% N doping and 0.165 mol% Ce doping, respectively.展开更多
文摘采用分散剂对钛白粉进行了物理包覆,显著提升了钛白粉在水中的分散性能。同时,分析了钛白粉的自分散机理,并从产品应用的角度对其进行了系统评价,实验发现:经过分散剂表面包覆后粉体的Zeta(ζ)电位由-61.98 m V提升至-69.17 m V,分散液吸光值由0.102提升至0.358,沉降实验清水层明显减少,说明钛白粉的自分散性和分散稳定性得到提升;另外,采用改性钛白粉制备的色浆与未改性钛白粉制备的色浆相比分散剂用量由6%降至2%,放置黏度变化小,说明改性包覆能够实现粉体的自动解絮凝能力。
文摘A new composite photocatalyst of modified oyster shell powder/Ce-N-TiO<sub>2</sub> was prepared by sol-gel method. Based on single factor experiment, Ce doping rate, N doping rate and calcination temperature were taken as input variables. Based on the central composite design (BBD) response surface model, two functional relationship models between three independent variables and glyphosate removal rate were established to evaluate the influence degree of independent variables and interaction on catalyst. The significance of the model and regression coefficient was tested by variance analysis. The analysis of the obtained data showed that the degradation performance of the composite photocatalyst was significantly affected by the calcination temperature and the rate of N doping, while the rate of Ce doping had little effect;at the calcination temperature of 505.440°C, the degradation rate of glyphosate reached the maximum of 82.15% under the preparation conditions of 17.057 mol% N doping and 0.165 mol% Ce doping, respectively.
