磷酸活化法制备糠醛渣活性炭的研究

Preparation of Activated Carbon from Furfural Residues by Phosphoric Acid Activation

以碘吸附值、亚甲基蓝吸附值及活性炭得率为考察指标,选取对糠醛渣活性炭性质影响较大的浸渍比、磷酸质量分数、活化温度、保温时间4个因素进行L16（45）正交试验对磷酸活化法制备糠醛渣活性炭的工艺条件进行优化。由正交试验结果得到磷酸活化的最佳工艺条件为：磷酸质量分数60%,浸渍比2.5∶1,活化温度550℃,保温1.5 h,此条件下制得的活性炭样品的碘吸附值为839.6 mg/g,亚甲基蓝吸附值为260.3 mg/g,得率为46.8%,比表面积为830.20 m^2/g,孔容积为0.502 cm^3/g,孔径集中在0.8-2.5 nm,具有丰富的中孔和微孔。

With iodine adsorption value, methylene blue adsorption value, and yield as analyzing indexes of activated carbon prepared from furfural residue, four factors had been chosen to perform L16 （4^5） orthogonal experiment including impregnation ratio, phosphoric acid concentration, activation temperature and holding time to optimize the preparation conditions of phosphoric acid activation. The conclusion could be drawn from the orthogonal experiment that the optimal technological conditions were phosphoric acid concentration 60%, impregnation ratio 2.5： 1, activation temperature 550 ℃, and holding time 1.5 h. Under these conditions, the iodine adsorption value of the obtained activated carbon was 839.6 mg/g, the methylene blue adsorption value was 260.3 mg/g,the yield was 46.8% ,and the specific surface area was 830.20 m2^/g.