吸附
碳纤维
活性炭
化学工程
氧气
复合数
材料科学
比表面积
多孔性
色散(光学)
化学
复合材料
有机化学
催化作用
物理
光学
工程类
作者
Shouxin Liu,Jianping Sun,Zhanhua Huang
标识
DOI:10.1016/j.jhazmat.2009.08.086
摘要
Glucose and commercial activated carbon (AC) were used as starting materials to hydrothermally synthesize carbon spheres on the surface of AC, producing new carbon sphere–AC hybrid carbon materials. It was found that micrometer-sized carbon spheres, rich in oxygen-containing functional groups, can be effectively anchored to, and well-dispersed on, the surface and at the entrance to the macropores of AC. As the glucose concentration increased, the size and dispersion of carbon spheres changed, the porosity of the AC decreased, the number of oxygen-containing functional groups increased, and COH gradually became the dominant functional group. The carbon composites that were obtained exhibited a remarkably enhanced adsorption capacity for Cr(VI) per unit mass and per unit surface area. The highest adsorption capacity per unit mass achieved was 0.4834 mmol g−1, about 4 times that of unmodified AC. The abundant surface oxygen-containing functional groups and relatively well-developed pore structure were the main causes of the high specific adsorption capacity of the carbon sphere/AC composites.
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