Abstract

The effect exerted on the chemical properties and structure of activated carbon by the mechanical treatment as a modification procedure was studied. Mechanochemical modification of carbon samples was performed in a roller–ring vibration mill for 5 to 30 min. Samples were studied by X-ray diffraction, IR spectroscopy, and low-temperature nitrogen adsorption. X-ray diffraction analysis shows that the supply of mechanical energy increases the extent of structural disordering of activated carbon, which is manifested in an increase in microstrains. The mechanical treatment for more than 5 min led to a decrease in the specific surface area of the samples with a simultaneous increase in the total pore volume. The mechanical treatment for 5 min and less led to an increase in the specific surface area and to a decrease in the pore volume. The results of potentiometric titration and Boehm titration show that the modification leads to an increase in the concentration of phenolic and carboxyl groups. It is concluded that mechanochemical modification of activated carbon in air leads to its intense oxidation resulting in formation of oxygen-containing groups and in their decomposition.

中文翻译：

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空气中活性炭的机械化学改性

摘要

研究了通过机械处理作为改性方法对活性炭化学性质和结构的影响。碳样品的机械化学改性在辊环振动磨中进行5至30分钟。通过X射线衍射，IR光谱和低温氮吸附研究了样品。X射线衍射分析表明，机械能的供应增加了活性炭结构紊乱的程度，这表现为微应变的增加。机械处理超过5分钟导致样品的比表面积减少，同时总孔体积增加。5分钟或更短时间的机械处理导致比表面积增加和孔体积减少。电位滴定和Boehm滴定的结果表明，这种修饰导致酚和羧基浓度的增加。结论是，空气中活性炭的机械化学改性导致其强烈氧化，导致形成含氧基团并分解。