Large-hole-diameter active carbon and preparation method thereof

Abstract

The invention relates to the field of active carbon preparation, in particular to large-hole-diameter active carbon and a preparation method thereof. The method comprises the following steps of 1, crushing active carbon raw materials; soaking the raw materials into an ethanol solution; adding hydroxide into the ethanol solution to be used as a pore-enlarging agent; performing ultrasonic wave oscillation; then, performing water washing drying to obtain pre-treated active carbon; 2, adding a surface active agent into the pretreated active carbon for uniform mixing; 3, performing heating under nitrogen gas protection to obtain pretreated active carbon; next, switching the nitrogen into mixed gas of water vapor and carbon dioxide; performing activation to obtain the large-hole-diameter activecarbon. The large-hole-diameter active carbon and the preparation method have the advantages that firstly, physical and chemical methods are used for simultaneously acting for pore expansion; secondly, in the activation process, the mixed gas of carbon dioxide and water vapor is used for physical activation; the active carbon pore diameter is expanded under the cooperated effects of the carbon dioxide and the water vapor.

Description

technical field [0001] The invention relates to the field of activated carbon preparation, in particular to a large-pore activated carbon and a preparation method thereof. Background technique [0002] Activated carbon has excellent physical and chemical stability, developed pore structure and high adsorption capacity, and is widely used in food, chemical, environmental protection, pharmaceutical and new energy and other related industries. Such as catalyst carrier, battery electrode, supercapacitor, gas storage and biomedicine, it has been widely used. Among them, the research and development of highly conductive activated carbon in battery and supercapacitor energy storage electrode materials has attracted more and more attention. [0003] Activated carbon as an energy storage material must have a large specific surface area, because the larger the specific surface area, the higher the capacity of activated carbon, and the higher the specific capacity and specific energy ...

AI Technical Summary

Problems solved by technology

[0003] Activated carbon as an energy storage material must have a large specific surface area, because the larger the specific surface area, the higher the capacity of activated carbon, and the higher the specific capacity and specific energy of the energy storage material; at the same time, activated carbon should also have a rich macroporous structure. If the pore size is too small, such as a microporous structure (r<2nm), the anion radius of the solution is large, and it cannot diffuse inside the micropores, resulting in a decrease in the utilization rate of activated carbon.