STUDY ON THE CHARACTERIZATION OF THE ELECTRIC ADSORPTION PROPERTY OF ACTIVATED CARBON MODIFIED BY METAL OXIDE

摘要

Modified activated carbon is often used as electrode material for electro-adsorption technology of saline wastewater. In the present paper, on the basis of the orthogonal experiment to determine the optimum technological conditions for modification, activated carbon (AC) supported titanium dioxide (TiO_2-AC) particles were prepared by sol-gel process, which was pretreated with hydrochloric acid. The properties of activated carbon materials before and after modification were characterized by SEM, EDS, BET, FTIR, XRD, TEM and electrochemical workstation. The results showed that the optimum parameters of the AC modified by titanium were 30 mL for C_2H_5OH, 4.5 mL for deionized water, 2 mL for CH_3COOH, 0.25 mL for HCl, and 2.5 g for AC. Under this condition, the specific surface area of AC was reduced by 38.4%, while the specific capacitance was increased by 55.2%. And the surface of the electrode material became rough and formed a large number of TiO_2 solid particles. The hydrophilic groups such as Ti-O bond, C-Ti bond and C- Ti-O bond were found on the surface. Titanium elements in the case of square anatase crystal (TiO_2) existence. There are a large number of TiO_2 nanocrystals on the surface of TiO_2-AC and the particle size distribution is about 5-10nm. The Ti element was mainly present in the form of titanium oxide, Ti-C and titanium. The electrochemical properties of AC electrode materials is improved by this modification methods, and could be used as electrode materials for electrosorption desalination.