Adsorption of Zinc Ions in Aqueous Solution by Modified Biochar from Jujube Branch
Hydrothermal carbon generated by hydrothermal carbonization of waste jujube branches was activated with zinc chloride as an activator,and a kind of modified biochar was prepared with highly porous and aromatic structure on its surface,which was then used to adsorb Zn2+in aqueous solution.It is shown that for the solution with pH of 9 and initial Zn2+concentration of 30 mg/L,after 80 min adsorption at a temperature of 55 ℃ by adding 700 mg/L modified biochar,the removal rate of Zn2+therein exceeds 99％.The adsorption process is well-fitted to the Freundlich adsorption model,indicating that the adsorption process with the modified biochar is a multilayer molecular adsorption.The removal rate of Zn2+by the modified biochar,after 5 cycles of adsorption and desorption,can still remain over 97％.
wastewater treatmentwastewater from metallurgical processing of zincjujube branchesbiomassbiocharadsorbentzinc chloridezinc ion
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