Zinc oxide-cerium oxide composite particles
A technology of composite particles and ceria, which is applied in the direction of zinc oxide/zinc hydroxide, rare earth metal oxide/hydroxide, lanthanide oxide/hydroxide, etc.
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Embodiment 1
[0055] Example 1 : 1463g / h solution A at 20°C (at this temperature, the viscosity is 325mPas) and 136g / h solution C at 80°C (at this temperature, the viscosity is 9.2mPas) through the ternary-material nozzle (triple-material nozzle) is atomized into the reaction space and forms an aerosol. The average droplet diameter D of the aerosol 30 Less than 100μm. At this time, the combustion includes hydrogen (3Nm 3 / h) and primary air (5Nm 3 / h) hydrogen-oxygen flame in which the aerosol reacts. In addition, the secondary air (25Nm 3 / h) introduction into the reaction space. The temperature at 0.5m below the flame is 925°C. Next, the reaction mixture is cooled and passed through a filter to separate the solid product from the gaseous material.
[0056] Examples 2 to 6 were carried out in a similar manner. Raw materials and amounts are listed in Table 1. The compositions and BET surface areas of the resulting composite particles are also listed in Table 1.
[0057] figure...
Embodiment 7
[0062] Embodiment 7: photocatalytic activity
[0063] By referring to the degradation of dichloroacetic acid (DCA) to detect the photocatalytic activity of zinc oxide (comparison) and the composite particles from Example 2, an irradiation reactor with constant temperature at 20°C was used in the detection, and the volume of the reactor was 250ml and has an area of 4.9cm 2 quartz glass windows. Irradiate with a 450W xenon lamp (Osram XBO) with a radiation intensity of 65mW / cm 2 . The irradiation time is at least 4 hours. The material tested was in the form of a 0.1% concentration aqueous dispersion. To keep the ion concentration constant throughout the experiment, an additional 10 mM of KNO was added to the dispersion 3 . The initial concentration of dichloroacetic acid (DCA) was 1 mM. The pH of the constantly stirred dispersion was kept constant by titration of 0.1 M NaOH.
[0064] The degradation of DCA can be directly detected by reference to the consumption of s...
Embodiment 8
[0069] Example 8: Preparation of dispersions according to the invention
[0070] 0.1% by weight of polyacrylic acid in the form of the sodium salt was added to 50 g of water, and then the composite particles from Example 2 were added in portions with stirring to the water until a solids content of 10% by weight was reached. Then, in each case, the mixture was dispersed for one minute with an ultrasonic finger (diameter: 7 mm, instrument: ultrasonic processor UP 400s, power: 400 W, Dr Hielscher).
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