污泥基活性炭的两步热解优化制备及其性能表征

Optimization and Preparation of Sludge-based Activated Carbon by Two-step Pyrolysis and Performance Characteration

以城市污水处理厂的污泥为原材料,添加一定量的玉米秸秆,利用两步热解化学活化法制备污泥基活性炭.选择ZnCl2作为活化剂,固液比为1∶2,在400℃的碳化温度下保持60 min对原材料进行碳化,考察了热解活化温度以及玉米秸秆质量分数对活性炭比表面积和产率的影响.结果表明:当活化温度为500℃、玉米秸秆质量分数为25%时,比表面积达756 m2/g;产率随着温度的升高有降低的趋势;在活化温度为450℃、玉米秸秆质量分数为25%的条件下制得的活性炭产率最大,达到43%.

Sludge-based activated carbon was produced with sewage sludge from municipal wastewater treatment facility combined with corn straw as raw material by a two-step pyrolysis method through chemical activating ZnCI/. First sludge was carbonized at 400 ℃ for 60 min, then it was mixed with activator solution at a solid to solution ratio of 1 ： 2. BET value and yield were observed according to the variation of temperature and the content of corn straw. Results showed that when activated carbon was produced under the condition of 25% corn straw content and 500 ℃ pyrolysis temperature, the BET surface area achieved 756 m2/g. The yield presented a trend of slow dropping with increasing temperature. When activated carbon was prepared under the temperature of 450 ℃ and corn straw content of 25% , yield attained the maximum value 43.1%