ZnCl_2/CuCl_2复合活化剂制备污泥活性炭及其分形研究

PREPARATION AND FRACTAL RESEARCH OF ACTIVATED CARBON FROM SLUDGE WITH ZnCl_2/CuCl_2 AS ACTIVATING AGENT

以污水处理厂剩余污泥为原料,以氯化锌和氯化铜为复合活化剂,采用低温炭化及中温活化方法制备了污泥活性炭。经正交优化得到最佳制备条件为:活化温度为534℃,活化时间为60 min,ZnCl2浓度为3.0 mol/L,CuCl2浓度为0.3 mol/L,碘吸附值达到534.0 mg/g。所得污泥活性炭含有大量微孔,同时也含有部分中孔和大孔,BET比表面积为784.89 m2/g,Langmuir比表面积为1 053.69 m2/g;利用污泥活性炭吸附制药废水,实验结果符合Freundlich方程,由此建立的分形吸附模型证明制备的污泥活性炭具有分形特征,其分形维数越高,则粗糙度越大,碘吸附值越高。

Activated carbon was prepared with sewage sludge as raw material and ZnC12/CuC12 as activating agent by low tempertaure carbonization method. The optimum preparation conditions were activation temperature 534 ℃, activation time 60 min,ZnC12 concentration 3.0 mol/L, CuCl2 concentration 0.3 mol/L, the iodine adsorportion value was 534.0 mg/g. The prepared sludge carbons have a large amount of mieropores, also have mesopores and maeropores, with a BET surface area at 784.89 m2/g and a Langmuir surface area at 1 053.69 m2/g. Adsorption of pharmaceutical wastewater on sludge activated carbon was conducted. The data were fitted by Freundlieh equation. The sludge activated carbon had fraetal characteristics, the iodine adsorportion value growed with the fractal dimension and the roughness.