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(1) Chemical activation and catalytic activation modification
Chemical activation modification is the activation of chemical reagents
Catalytic activation modification is the addition of metal or non-metal compounds and other additives to the ACF, and then carbonization and activation to prepare mesoporous ACF
Free man J.
(2) Oxidation modification
Oxidation modification mainly uses strong oxidants to oxidize the functional groups on the surface of the ACF at an appropriate temperature, thereby increasing the content of oxygen-containing acid groups on the surface and enhancing the polarity of the surface
Morawski et al.
(3) Introduction of nitrogen-containing group modification
Soaking the ACF in some nitrogen-containing compounds will increase the nitrogen content on the surface of the modified ACF and improve the adsorption capacity
Rong Haiqin et al.
(4) Modification of supported metals and metal compounds
Loaded metal and metal compound modification is to make metal ions first adsorb on the surface of ACF, and then use the reducibility of ACF to reduce metal ions into elemental or low-valence ions.
Oye et al.
The following takes the preparation of manganese-loaded sisal-based activated carbon fiber as an example to illustrate the preparation of activated carbon cellulose
①Fiber pretreatment.
②Carbonization activation The pretreated sisal fiber is placed in a carbonization furnace and heated to 700-900°C at a heating rate of about 8°C/min under the protection of inert gas to obtain carbon fibers at different carbonization temperatures; at the specified temperature After a short period of constant temperature, water vapor was passed at a constant speed to activate the carbon fiber.
③ Load of manganese: Soak SACF in MnSO 4 solutions of different concentrations , or immerse them in manganese solutions of the same concentration and different anions or valences for 24 hours, dry the fibers after saturated adsorption, and finally heat them in nitrogen at the decomposition temperature After treatment, a modified SACF is obtained, which is represented by SACF-Mn
The carbonization activation reaction conforms to the first-order kinetic law, and the reaction rate is directly proportional to the quality of the activated carbon fiber.
Related Links: Activated Carbon Fiber (ACF) Preparation Method