Modification Of Powder Activated Carbon Adsorption Heavy Metal Ion Research

Cu2+, Zn2+ ion is great harm of heavy metal pollutants in the water they formed their respective compounds, along with the migration of water pollution soil, crops and so on, finally through the food chain effect cause a harm to the animal and plant body;Compared to the current to remove heavy metal ions, adsorption has a good application prospect.At present, the adsorption material is varied, including powder activated carbon has a porous, large specific surface area, strong adsorption ability, abundant raw materials preparation and adsorption can be a very good after burned for subsequent processing, has a strong applicability.This thesis with Cu2+ and Zn2+ waste liquid as the research object, investigated before and after modification are powder activated carbon adsorption time, solution p H, ion concentration, the influence of the dosage of activated carbon on adsorption to the following conclusion:(1) Modified activated carbon adsorption of heavy metal ions before belongs to fast adsorption, simulation of 5 mg/L Cu2+ions in waste water, when activated carbon additive quantity is 8.0 g/L, after 25 minutes of adsorption can be close to balance, removal rate is 87%;Modified removal rate was 96% in the same conditions, the adsorption removal efficiency has the obvious improvement.(2) Before, during and after the modification of activated carbon additive quantity is 8.0 g/L adsorption Zn2+ 5 mg/L, 25 min removal rate are 56% and 56% respectively, compared with Cu2+ decreased obviously, known activated carbon for Cu2+, Zn22+selective adsorption.(3) Before modification, and powder activated carbon adsorption process of Cu2+ions in line with the Langmuir isotherm, available Lagergren quasi level 2 dynamic model is better described;For the powder activated carbon adsorption Zn2+ is with the Freundlich adsorption isotherm, Lagergren first order kinetics model is better described.(4) After modification, powder activated carbon adsorption process of Cu2+ ions, available Langmuir isotherm and Lagergren was well described by the first order kinetics model,For the adsorption of Zn2+, can use the Langmuir adsorption isotherm, Lagergren first order kinetics model is better described.