Abstract: The ability of bamboo charcoal particles as absorbent has been well proved.Bamboo charcoals treated with different acid and alkaline solutions were used to study effectiveness of their particles adsorbing malachite green in aqueous solutions and further adsorption kinetics of the bamboo charcoal particles screened out in the preceding study.And then the resultant data were fitted with the pseudo-second order kinetic model and particle diffusion model.On such a basis,factors affecting the adsorption process were explored.Results show that the bamboo charcoal particles modified with 0.5 mol·L-1 NaOH solution were the most effective in adsorbing malachite green,adsorbing as much as 9.96 mg·g-1.The particle diffusion model can better describe the kinetic process of adsorption.The mass and size of bamboo charcoal particles,the initial concentration of malachite green in the solution,agitation speed and the initial pH value of the aqueous solution are all potential factors affecting the adsorption process.

Key words: modified bamboo-carbon particle, aqueous solution of malachite green, particle diffusion model, adsorption kinetics