Method of improving activated carbon precursor hydrophilicity

Abstract

The invention discloses a modifying method of hydrophilicity of active charcoal predecessor, which is characterized by the following: adopting air to oxidize the predecessor with carbon; improving the hydrophilicity of the predecessor with carbon to improve the property of the active charcoal finally; aerating air or the air with oxygen under 200-450 deg. c to oxidize the predecessor with carbon or other carbonizing material; increasing the oxygen functional group on the surface of predecessor with carbon or other carbonizing material; accelerating the wettability of KOH on its surface; improving the specific surface area finally with simple and practicable operation, low cost.

Description

technical field [0001] The present invention relates to a method for improving the hydrophilicity of activated carbon precursors, specifically a method for improving the hydrophilicity of carbon-containing precursors by using air to oxidize the carbon-containing precursors to finally improve the performance of the resulting activated carbon . Background technique: [0002] The preparation of super activated carbon is a research hotspot in the field of activated carbon. Most of the research work is to use carbon-containing precursors such as coal, petroleum coke, polymer resins, plant shells, crop straws, and some other carbonizable substances to directly react with KOH, without considering the properties of the carbon-containing precursors themselves. In many cases, the carbon-containing precursor or its carbide itself is hydrophobic, that is, its polarity is small, and it is not easy to be wetted by a strong base such as KOH, resulting in a low specific surface area of ​​​...

AI Technical Summary

Problems solved by technology

Wang Dachun et al. (Wang Dachun, Tong Shitang, Zhang Hailu, Fan Mingxia, Preparation of high-sulfur coal-based activated carbon with high specific surface area, Environmental Science and Technology, 2005, Vol. 28, No. 1, 30-31) used high-sulfur coal as raw material, and first used KNO3 Pre-oxidation and carbonization treatment, and then KOH is used as an activator to prepare activated carbon. The purpose is to use KNO3 as a catalyst, so that most of the catalyst penetrates into the capillary pores of coal during the mixing process with coal, and a small part is adsorbed on the surface of coal particles. During the carbonization process of the material, the nitrate in the catalyst decomposes to release oxygen, oxidizes the alkyl side chain on the coal molecule, forms an oxygen-containing functional group on the coal macromolecule, and finally improves the performance of the activated carbon, but the cost of this method is relatively high. high