Niu Taoxia, Zhou Jiawei, Zhang Chao, Li Shuang
School of Chemical Engineering, Northwest University Xi'an Shaanxi 710069 People's Republic of China
RSC Adv. 2018 Jul 30;8(47):26978-26986. doi: 10.1039/c8ra04396e. eCollection 2018 Jul 24.
Coal-based activated carbons (CACs) were prepared from three long flame coals with different ash and volatile matter content. CACs prepared by coal with high ash (6.74%) and volatile matter content (34.31%) showed better adsorption efficiency towards MB (547.35 mg g) due to higher surface area and pore volume. The effect of coal to activating agent ratio (CAR) was also investigated in a batch reactor. The porosity development is closely related to the CAR. The calculated monolayer adsorption amount (714.29 mg g) was found on YLC-AC-3 with a surface area of 1212.50 m g. The equilibrium data were favorably described by the Langmuir and Freundlich isotherm models, and adsorption kinetics fitted well to the pseudo-second order model. The removal efficiency remains at 98.21% after five runs. The results of the present study suggest that CACs are potential and effective adsorbents in fast removal of dyes from aqueous solution.
以三种灰分和挥发物含量不同的长焰煤为原料制备了煤基活性炭（CAC）。由高灰分（6.74%）和高挥发物含量（34.31%）的煤制备的CAC对亚甲基蓝（MB）表现出更好的吸附效率（547.35 mg/g），这归因于其更高的比表面积和孔体积。还在间歇式反应器中研究了煤与活化剂比例（CAR）的影响。孔隙率的发展与CAR密切相关。在比表面积为1212.50 m²/g的YLC-AC-3上测得计算的单层吸附量为714.29 mg/g。平衡数据可用Langmuir和Freundlich等温线模型很好地描述，吸附动力学很好地符合准二级模型。经过五次运行后，去除效率仍保持在98.21%。本研究结果表明，CAC是从水溶液中快速去除染料的潜在有效吸附剂。
