Sorption Of Norfloxacin By Lotus Stalk-based Activated Carbon: Mechanisms, Isotherms And Kinetics

This paper studied the effect of initial pH, temperature lotus bar activated carbon to water solution chino-e norfloxacin adsorption capacity, proven by phosphoric acid activation of lotus bar activated carbon for norfloxacin adsorption characteristics. Activated carbon preparation condition:H3PO4 solution mass fraction is 40%, a solid-liquid mass ratio of 2.5:1, impregnation time 12 h, activation temperature of 450 degrees C, the activation time of 1 h. Preparation of activated carbon surface is rough, the distribution of a large number channel, irregular porous structure; high specific surface area of 1289.1m2/g, average pore diameter of 3.41nm; activated carbon surface in the presence of some functional groups, basic functional groups a total of 0.894mmol/g.Adsorption experiment results show that, the lotus stalk activated charcoal (LAC) on the adsorption of norfloxacin showed strong pH dependence. The maximum adsorption capacity (922.70μmol/g, removal rate 95.10%) occurred at pH 6.5 and 5.5, which is close to the adsorbent of the point of zero charge. Lotus stalk activated charcoal equilibrium isotherm data conform to Langmuir equation. Adsorption kinetics of quasi two level dynamic model by. The paper also puts forward several possible mechanisms of adsorption adsorption system. Lotus bar on activated carbon adsorption, hydrophobic interactions, cation exchange and donor-acceptor interactions, may be the primary mechanism.