Carbon-silicon microspheres for dioxin detection and preparation method thereof
A technology of microspheres and carbon silicon, which is used in nanotechnology, chemical instruments and methods, carbon compounds, etc. for materials and surface science. It can solve the problem of interference detection results, it is difficult to meet the requirements of dioxin detection, and the recovery rate is low. and other problems, to achieve the effect of simple preparation method, practical preparation method and low cost
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[0040] see figure 1 , the present invention also provides a method for preparing silicon carbon microspheres, comprising the following steps:
[0041] S1 Add porous silica gel microspheres to the carbon source solution, and mix to obtain a mixture;
[0042] Specifically, S1 includes:
[0043] Disperse the carbon source in water to obtain a carbon source solution; add porous silica gel microspheres to the carbon source solution, and mix uniformly to obtain a mixture.
[0044] In one embodiment of the present invention, during the process of mixing the carbon source solution with the silica gel microspheres, ultrasonic treatment is performed so that the carbon source is more uniformly loaded on the silica gel microspheres.
[0045] Specifically, the carbon source of the carbon source solution is one or more of furfuryl alcohol, polyvinyl alcohol, polyethylene glycol, glucose, polyvinylpyrrolidone, and urea.
[0046] The concentration of the carbon source solution is 1.5wt%-17...
Embodiment 1
[0065] Dissolve 5.0g of furfuryl alcohol in 35.0mL of ultrapure water, mix well, add 4.5g of porous silica gel microspheres (60-200μm) into it, stir and ultrasonic for 10 minutes, then transfer the suspension to a 100mL high-temperature reaction kettle , and kept at 180°C for 3 hours, let it cool naturally to room temperature to obtain a precursor, pour it into a beaker, and then dry the obtained precursor in an 80°C blast oven for 6 hours. The dried precursor is heated up under the protection of argon. When the temperature is 50-500°C, the heating rate is controlled at 13°C / min, when the temperature is 500-800°C, the heating rate is 8°C / min, to 800°C Then, the obtained porous silica-supported activated carbon microspheres were activated with carbon dioxide at 900°C for 3 hours. Characterized by scanning electron microscopy, it was found that the particle size of the microspheres was 60-200 μm. The hydrothermal process did not change the shape of the silica gel. The specific s...
Embodiment 2
[0067] Dissolve 0.5g of glucose and 3g of urea in 50mL of ultrapure water. After the dissolution is uniform, add 4g of silica gel (60-200μm in particle size), stir and sonicate for 10min, then transfer the suspension to a 100mL reaction kettle. After heat preservation at 200°C for 4 hours, let it cool down to room temperature naturally, filter and dry the resulting precursor in an air blast oven at 80°C for 6 hours. The dried precursor was heated up under the protection of argon, the heating rate of 50-500°C was controlled at 13°C / min, the heating rate of 500-800°C was 13°C / min, and it was kept at 800°C for 3 hours (carbonization time), and then, the obtained porous silica-supported activated carbon microspheres were activated with carbon dioxide at 900°C for 3 hours. Characterized by scanning electron microscopy, it was found that the particle size of the microspheres was 60-200 μm, the hydrothermal process did not change the shape of the silica gel, the carbon content was 3....
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