Abstract:

The adsorption capacities of the bamboo-charcoal for mercury(Ⅱ)was studied in aqueous solution. Parameters studied include contact time,pH value,mass of absorbent, adsorption temperature,and initial concentration of mercury in solution.Results showed that bamboo-charcoal could effectively remove mercury from aqueous solution. The bamboo-charcoal showed high adsorption ability for mercury at a wide pH range(pH=3.2～6.2), The optima adsorption acidity of bamboo-charcoal for Hg(II) is pH=5.90 in Hac-NaAc medium. Adsorption decreased with increases in adsorption temperatures, it means that the adsorption process is a exothermic process. The adsorption behavior of the bamboo-carbon for mercury(Ⅱ) obeys the Freundlich isotherm model. After the bamboo-charcoal of adsorption can be regenerated quantificationally with H₂O and microwave heating,the percentages of regeneration reach upwards of 97%. The bamboo-charcoal are the better absorptive material removing mercury(Ⅱ)from aqueous solution.

Key words: bamboo-charcoal, mercury (Ⅱ), adsorption, influencing factors