【摘要】 为提高棉产业废弃物棉花壳利用的附加值,以KOH为活化剂,微波热解制备出棉花壳基活性炭并对其性能进行研究。研究化学浸渍比、微波功率、辐照时间对棉花壳废料的碳产率及其产品活性炭吸附性能的影响,并以亚甲基蓝为吸附质定量分析棉花壳基活性炭的吸附能力,分别采用准一阶、二阶和Elovich方程拟合吸附动力学方程,揭示棉花壳基活性炭吸附特性。结果表明:在浸渍比为1.5、微波功率为600 W、辐照时间为6 min,制备的棉花壳基活性炭性能最佳,其对亚甲基蓝单层吸附量为408.21 mg/g, BET比表面积和总孔体积分别为1 481.07 m~2/g和0.846 m~3/g,可达到同类活性炭的吸附性能要求。此制备方法的研究可为田间作物废料棉花壳进行高附加值利用提供参考。更多还原

【Abstract】 In order to increase the added value of the utilization of cotton shell waste(CSW), the preparation of activated carbon from this resource by microwave-assisted KOH activation was investigated. The effects of operational parameters, including chemical impregnation ratio, microwave power and irradiation time, on the yield and adsorption capability of the CSW-based carbon were optimized. The adsorption capacity of CSW-based activated carbon was quantitatively analyzed with methylthionine chloride as the adsorbent. The kinetic modeling was fitted to pseudo-first-order, pseudo-second-order, and Elovich equations, revealing the adsorption mechanism on the activated carbon. Experimental results show that when the chemical impregnation ratio, microwave power, and irradiation time are 1.5, 600 W and 6 min, respectively, the obtained CSW-based carbon has the best adsorption performance. The monolayer adsorption capacity for methylthionine chloride is 408.21 mg/g. The BET surface area and total pore volume are measured as 1 481.07 m~2/g and 0.846 m~3/g, respectively. The CSW-based carbon meets the adsorption performance requirements of similar activated carbons. The research on the preparation method may provide a reference for future high-value-added utilization of crop wastes such as cotton husks in the field.更多还原