改性芋叶柄基活性炭的制备及表征

Preparation and characterization of modified taro petioles-based activated carbon

采用H_2O_2-HNO_3混合液对芋叶柄基活性炭进行轻度表面氧化改性,再利用表面负载离子的方法对其表面负载Cu^(2+),制备负载铜芋叶柄基活性炭。以亚甲基蓝脱色率为评价指标,分析2次改性过程对芋叶柄基活性炭吸附性能的影响,利用低温N_2吸附、傅里叶红外光谱(FT-IR)等实验技术,对芋叶柄基活性炭的孔结构与性能进行表征与分析。结果表明,经氧化改性后芋叶柄基活性炭的比表面积及孔径增大,BET比表面积为922.600m2/g,孔容0.068cm3/g,孔径18.471nm,对亚甲基蓝脱色率为74.38%。经2次改性后负载铜芋叶柄基活性炭对亚甲基蓝脱色率达93.44%,吸附能力得到进一步提高。

Taro petioles-based activated carbon was mildly oxidized in acid mixtures of H202 and HNO3, then, through copper ion adsorption on oxidized activated carbon, re-modified taro petioles-based activated carbon was prepared. The decoloration rate of methylene blue solution was analyzed as indices of adsorption property, and the porous structure and properties of activated carbon were investigated by low temperature nitrogen adsorption and FT-IR. The results showed that the specific surface area and pore diameter of activated carbon were increased with BET specific surface area of 922. 600m2/g ,pore volume of 0. 068cc/g ,pore diameter of 18. 471nm, and the decoloration rate of methylene blue solution was 74.38 %. After re-modifying, the taro petioles-based activated carbon adsorption property to methylene blue solution in- creased obviously,the methylene blue solution decolor rate gone up to 93.44%.