磷酸活化法黄麻杆活性炭的制备及表征

Preparation and Characterization of Jute Stick-Based Activated Carbon

以黄麻杆为原料,采用磷酸活化法制备活性炭,通过正交试验探讨了磷酸浓度、活化温度、活化时间对活性炭得率和吸附性能的影响,确立了最佳制备工艺,即:磷酸浓度2 mol/L、活化温度400℃、活化时间1 h.实验结果表明:在最佳工艺条件下制得的黄麻杆活性炭得率为42.93%,碘吸附值为1 059.26 mg/g,亚甲基蓝吸附值为353.10 mg/g,比表面积为1 779.4 m2/g,总孔容为0.960 cm3/g,平均孔径为2.16 nm,呈现出高中孔率结构.

Jute stick-based activated carbon are prepared by using jute sticks as raw materials and phosphoric acid as activating agent. The effects of several main factors such as concentration of activating agent, activation temperature and activation time on the yield and adsorption properties of active carbon are investigated via orthogonal experiments. Results show that the optimum conditions are phosphoric acid concentration of 2 mol/L, activation temperature of 400 ~C and activation time of 1 h. The yield is 42.93%, the iodine adsorption value and methylene blue adsorption value of the activated carbon are 1 059.26 mg/g and 353.10 mg/g, respectively. The specific surface area is 1 779.4 ㎡/g, the total pore volume is 0.960 m3/g and the average pore size is 2.16 nm, showing highly mesoporous structures.