改性生物质活性炭对甲醛气体吸附性能

Adsorption Performance of Formaldehyde Gas onto Modified Biomass Activated Carbon

以山核桃壳作为碳质材料制备生物质活性炭,分别利用磷酸与氨水对生物质活性炭进行改性处理,获得改性生物质活性炭。研究了酸改性生物质活性炭和碱改性生物质活性炭对甲醛吸附性能的影响,对改性生物质活性炭进行了表征分析。结果表明:利用磷酸对生物质活性炭进行改性,其甲醛吸附性能大幅提高,当磷酸与山核桃壳超微粉的质量比为1.5∶1时,酸改性生物质活性炭对甲醛的吸附性能最优,即甲醛吸附效率为44.5%。酸改性生物质活性炭的层状结构明显,其颗粒之间形成了大量结构清晰且明显的不同形状孔隙。酸改性生物质活性炭有利于提高表面极性,改善粒径分布,增加比表面积。

Walnut shell was used as raw material to prepare biomass activated carbon, which was modified by phosphoric acid and ammonia water, respectively, to obtain modified biomass activated carbon. The effects of acid-modified biomass activated carbon on formaldehyde adsorption performance, and alkali-modified biomass activated carbon on formaldehyde adsorption performance were studied. Meanwhile, Characterization of acid-alkali modified biomass activated carbon was analyzed. The results show that the formaldehyde adsorption performance of activated carbon modified by phosphoric acid is greatly improved. When the mass ratio of phosphoric acid to pecan shell superfine powder is 1.5∶1, the adsorption performance of activated carbon modified by acid is the best, that is, the formaldehyde adsorption efficiency is 44.5%. The layered structure of acidmodified biomass activated carbon is obvious, and a large number of clear and distinct pores are formed between its particles. Acid-modified biomass activated carbon can improve surface polarity, particle size distribution and specific surface area.