基于甘蔗渣生物吸附重金属污染物的研究

用甘蔗渣作为生物吸附质,研究了甘蔗渣对水中铅铜离子吸附能力及影响因素,探讨了吸附质粒径、pH值、吸附时间和投加量等因素对铅离子和铜离子吸附的影响。结果表明:甘蔗渣吸附两种重金属的适宜粒径应大于140目,适宜pH为4~6,超过7则因氢氧化物沉淀生成而影响吸附;甘蔗渣对两种重金属的吸附很快,1.5 h就近乎达到衡;甘蔗渣对铅的吸附性能要优于铜,对铅最大吸附量可以达到41.32 mg/g,去除率为91.83%,对铜的最大吸附量可达到30.62 mg/g,去除率为68.05%;同时甘蔗渣对铅和铜的竞争吸附实验表明,铅和铜对甘蔗渣上基团的吸附存在竞争使得吸附量相对于正常条件下有较大的降低。

Study on the Biosorption of Heavy Metal Pollutants by Bagasse

Bagasse was used as bio-sorption agent to remove lead and cupper from water,the adsorption capacity and influencing factors such as particle size,solution pH,treating time,dose and so on were investigated in our experiment.The results show that the appropriate particle size is greater than 140 mesh;the suitable pH value is 4～6;If pH is more than 7,the hydroxide precipitate will be generated;The adsorption rate of both heavy metals can reach the equilibrium in 1.5 h.The adsorption performance of bagasse for lead is better than copper,the maximum adsorption capacity of lead can reach 41.32 mg/g,removal rate can reach 91.83％;the maximum adsorption of copper can be up to 30.62 mg/g,removal rate can reach 68.05％.At the same time,in competitive adsorption experiment,it's found that there is competition for the adsorption group of bagasse between lead and copper,which can result in adsorption quantity be lower than that under normal conditions.