科研之友
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摘要
Based on the development and utilization of biomass materials of bamboo charcoal, the bamboo charcoal pottery was prepared using bamboo charcoal powder, palygorskite, and diatomite, to address the drawbacks of tradi? tional carbon adsorption materials such as fragility and dust pollution. Firstly, the ceramic pellets with a diameter of 2-5 mm was prepared through the ceramic granulation process, and then sintered into bamboo charcoal pottery at 1 250 ℃ in N2 atmosphere. Secondly, its microstructure and adsorption properties were examined. The XRD test re? sults showed that the crystal structure of the bamboo charcoal pottery did not change before and after the sintering. It was indicated that the sintering did not change its structure and guaranteed the adsorption performance of the bamboo charcoal. The morphology of the raw materials was tested by SEM, and the results showed that the bamboo charcoal powder had macro pores of about 1 μm in the microstructure. The morphology of diatomite was disc?like structure with porous. The diameter of the disc was about 20-50 μm, and the diameter of the pore was about 0.1-1.2 μm. The morphology of the palygorskite was a needle?like structure with a diameter of 50-100 nm and a length of 500-1 000 nm. The SEM examination results showed that the cross?sectional structure of the bamboo charcoal pottery was loose and porous, and the original pore structure still maintained unchanged after the sintering, which ensured its adsorption performance. The BET test results showed that the specific surface area of the bamboo charcoal pottery reached 118.54 m2 / g, and its adsorption curve was consistent with the Type IV isotherm adsorption. The adsorption performance test showed that the adsorption rates of harmful gases such as formaldehyde, ammonia and hydrogen sulfide reached 87.7%, 94.6% and 96.3%, respectively. The water absorption rates of the bamboo charcoal and bamboo charcoal pot? tery were 5.1% and 22.0%, respectively. It can be seen that the water absorption rate was 4.3 times higher than that of the raw bamboo charcoal. This indicated that it had good moisture absorption and gas adsorption properties and could be a good air purification material. By using this method, the powdered bamboo charcoal can meet the requirements of recycling, which will broaden the applications in indoor environment and water treatments.
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