废棉布制备活性炭影响因素与机理研究

研究了采用磷酸活化法制备废棉布活性炭的工艺条件。研究表明,废棉布活性炭吸附能力随着磷酸浓度、浸渍时间、活化温度和活化时间的增加呈现先增加后减小的趋势。最佳制备条件为:磷酸浓度40%,浸渍时间24 h,活化温度500℃,活化时间30 min。此时制备的废棉布活性炭性能优于商品活性炭。另外,通过对最佳浓度磷酸浸渍的废棉布进行热失重分析,对磷酸活化废棉布制备活性炭机理开展了初步研究,研究表明磷酸活化废棉布制备活性炭过程分为水分蒸发阶段、炭化阶段、过渡阶段、活化阶段和煅烧阶段。

Study on influencing factors of activated carbon prepared by waste cotton and its mechanism

The technical conditions of preparation of activated carbon from waste cotton were studied.The results show that adsorption capacity of activated carbon increases first and then decreases with phosphoric acid concentration,impregnation time,activation temperature and time increasing.Optimum conditions are as follows: phosphoric acid concentration of 40%,impregnation time of 24 h,activation temperature of 500℃ and activation time of 30 min.Under the best conditions,the prepared activated carbon is better than commercial activated carbon.Through thermo gravimetric analysis,the phosphoric acid activation mechanism of waste cotton was discussed.The preparation process of waste cloth activated carbon can be divided into five stages: evaporation,carbonization,transition,activation and calcination.