Abstract
In order to improve adsorption capacity of granular activated carbon (GAC), potassium permanganate was used to react with GAC to change the surface properties and improve the adsorption capacity of GAC. By batch experiments, improvement of adsorption capacity of potassium permanganate modified GAC (GACM) was studied. The influence of adsorption time, temperature, ratio of phenol with GAC/GACM, initial concentration of phenol and pH on adsorption efficiency of GACM was studied. The results showed that modified by potassium permanganate, the adsorption capacity of GAC improved to a higher level. The removal efficiency of phenol increased to about 20%.
Highlights
With the development of chemical industry, more and more organic compounds were disposed into water and aggravated water pollution
The results showed that modified by potassium permanganate, the adsorption capacity of granular activated carbon (GAC) improved to a higher level
Utrilla et al [18] compared the advantages and disadvantages of different methodologies to modify the surface of activated carbons and found that modified by using H2O2, O3 and HNO3, acidic surface functional groups increase in the AC surface as the reduce of the AC surface area; and the nitrogenation or sulfuration of the AC surface can increase its basicity favoring the adsorption of organic compounds
Summary
With the development of chemical industry, more and more organic compounds were disposed into water and aggravated water pollution. Some researchers have found that carboxylic functional groups can be introduced upon oxidizing the surface of carbon materials by various oxidation agents such as concentrated nitric [23], ozone [24], ammonium [25] and H2O2 [26], which could help to change the inert and hydrophobic nature of carbon materials and enhance the wettability for polar solvents and make the surface active for the immobilization of organic compounds via adsorption [27]. Utrilla et al [18] compared the advantages and disadvantages of different methodologies to modify the surface of activated carbons and found that modified by using H2O2, O3 and HNO3, acidic surface functional groups increase in the AC surface as the reduce of the AC surface area; and the nitrogenation or sulfuration of the AC surface can increase its basicity favoring the adsorption of organic compounds
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