Research of Citric Acid Modified Adsorption of Cr (VI) Properties of Activated Carbons

Citric acid modification of activated carbon to examine citric acid concentration, temperature and time modified adsorption properties of activated carbon. The results demonstrate that with the extension of temperature and treatment time, the adsorption properties of modified activated carbon were then decreased overall trend. Better process for citric acid modified activated carbon: citric acid concentration of 50%, modified temperature is 30°C, modified time is 5h. Lagergren adsorption rate equation with primary and secondary adsorption rate equation and the average absolute deviation from the rate on the adsorption properties of these factors affects the processing; secondary adsorption kinetics model was found to better describe the various factors affecting the adsorption process under conditions.