摘要
利用微波氯化锌法对竹炭进行改性,以提高其吸附性能。通过正交实验,优化改性工艺条件,并用改性竹炭对4-硝基苯酚的吸附动力学和机理进行探讨。结果表明,最佳工艺条件为:固液比为1∶2时,50%氯化锌溶液浸泡8h,800W微波功率辐照6min,相对于未改性竹炭,其比表面积、孔容、对4-硝基苯酚的吸附量明显增大。用伪二级吸附速率方程拟合,相关系数r>0.999,颗粒内扩散过程不是该吸附速率的控制步骤。改性竹炭对4-硝苯酚的吸附是一个吸热过程,吸附活化能为16.81kJ.mol-1,以物理吸附为主。
Bamboo-carbon was modified with ZnCl2 by microwave radiation to enhance its adsorption capacity, the optimum technology was obtained through orthogonal test, and the kinetics and mechanism of adsorption of 4- Nitrophenol by modified bamboo-carbon were studied. The results showed that the optimum conditions were as follows ： ratio of ZnCl2 solution to bamboo-carbon is 2.0 to 1.0, concentration of ZnCl2 solution 50% and impregnating time 8 hours, microwave power 800 watts, radiation time 6 minutes. Compared with bamboo-earbon, the specific surface areas, total pore volume and the adsorption efficiency of 4-nitrophenol of modified bamboo-carbon are increased obviously. The adsorption processes follow a pseudo second-order kinetic rate equation and their linear correlation coefficients could be over 0. 999. Intra-particle diffusion is not the rate-controlling step. The adsorption of 4-nitrophenol by modified bamboo-carbon, which is an endothermic process, has a small energy of activation, and is mainly a physical adsorption process.
出处
《科学技术与工程》
2009年第24期7412-7415,7423,共5页
Science Technology and Engineering
基金
浙江省教育厅资助项目(20070512)资助
关键词
微波
氯化锌
改性竹炭
4-硝基苯酚
吸附动力学
microwave zinc chloride modified bamboocarbon 4-nitrophenol adsorption kinetics
