马尾藻基高比表面积活性炭的制备及表征

以马尾藻为原料,采用KOH活化法制备高比表面积活性炭。探索制备马尾藻基活性炭的实验方案和最佳工艺条件。采用正交实验法研究了炭化温度、炭化时间、低温活化温度、低温活化时间和浸渍时间对制得活性炭比表面积和孔容的影响。采用N_2吸附、SEM表征考察了活性炭的孔隙结构和表面形貌。通过正交实验法分析发现,制备马尾藻基高比表面积活性炭的最佳工艺条件为:炭化温度600℃,炭化时间180min,低温活化温度400℃,低温活化时间45min,浸渍时间2h。在16组实验条件下,制备的活性炭比表面积最大为3 122m2/g,所有样品的孔径几乎全部分布在6nm以内。

Preparation and Characterization for High Specific Surface Area Activated Carbon from Gulfweed

High specific surface area activated carbons were prepared by chemical activation of gulfweed with KOH as a chemical activation agent.Orthogonal experiment was adopted to discuss the influences of carbonization temperature,carbonization time,pre-activating temperature,pre-activating time and impregnation time on products' specific surface area and pore volume,by conducting the characterizations for pore structure and surface morphology through N2 adsorption and SEM.From orthogonal experiment results,the optimum preparation conditions can be fixed as..carbonization temperature 600 ℃,carbonization time 180 min,pre-activating temperature 400 ℃,pre-activating time 45 min and impregnation time 2 h.The biggest specific surface area of the as-synthesized activated carbons in this work was 3122 m2/g,and the pore sizes mainly concentrated within 6 nm.