Xiao Jin, Yu Bailie, Zhong Qifan, Yuan Jie, Yao Zhen, Zhang Liuyun
School of Metallurgy and Environment, Central South University, Changsha 410083, China E-mail:
Water Sci Technol. 2017 Oct;76(7-8):1687-1696. doi: 10.2166/wst.2017.285.
This paper examines a novel method of regenerating saturated activated carbon after adsorption of complex phenolic, polycyclic aromatic hydrocarbons with low energy consumption by using superheated water pretreatment combined with CO activation. The effects of the temperature of the superheated water, liquid-solid ratio, soaking time, activation temperature, activation time, and CO flow rate of regeneration and adsorption of coal-powdered activated carbon (CPAC) were studied. The results show that the adsorption capacity of iodine values on CPAC recovers to 102.25% of the fresh activated carbon, and the recovery rate is 79.8% under optimal experimental conditions. The adsorption model and adsorption kinetics of methylene blue on regenerated activated carbon (RAC) showed that the adsorption process was in accordance with the Langmuir model and the pseudo-second-order kinetics model. Furthermore, the internal diffusion process was the main controlling step. The surface properties, Brunauer-Emmett-Teller (BET) surface area, and pore size distribution were characterized by Fourier transform infrared spectroscopy (FT-IR) and BET, which show that the RAC possesses more oxygen-containing functional groups with a specific surface area of 763.39 m g and a total pore volume of 0.3039 cm g. Micropores account for 79.8% and mesopores account for 20.2%.
本文研究了一种新颖的方法，即通过过热蒸汽预处理结合CO活化，以低能耗再生吸附了复杂酚类、多环芳烃的饱和活性炭。研究了过热蒸汽温度、液固比、浸泡时间、活化温度、活化时间以及CO流量对煤粉活性炭（CPAC）再生和吸附的影响。结果表明，在最佳实验条件下，CPAC的碘值吸附容量恢复到新鲜活性炭的102.25%，回收率为79.8%。再生活性炭（RAC）对亚甲基蓝的吸附模型和吸附动力学表明，吸附过程符合Langmuir模型和准二级动力学模型。此外，内扩散过程是主要控制步骤。通过傅里叶变换红外光谱（FT-IR）和BET对表面性质、Brunauer-Emmett-Teller（BET）比表面积和孔径分布进行了表征，结果表明RAC具有更多的含氧官能团，比表面积为763.39 m²/g，总孔容为0.3039 cm³/g。微孔占79.8%，中孔占20.2%。
