水华蓝藻生物质对Cu~(2+)的吸附动力学及吸附平衡研究

文章初步研究了水华蓝藻生物质对重金属离子Cu2+的吸附特性,包括生物吸附动力学和吸附等温线。生物吸附动力学结果表明,Cu2+的生物吸附可分为两个阶段,第一个阶段能较快地达到平衡,而之后的阶段进行缓慢。透析袋处理的蓝藻生物质在不同pH(3,4,5,6)的铜离子溶液条件下,吸附效率依次为62.4%,78.1%,71.2%,60.35%,吸附最大值为7.81 mg/g。水华蓝藻生物质对Cu2+的生物吸附平衡等温线可以用Freundlich模型精确拟合。水华蓝藻生物质在处理低浓度的含Cu2+废水方面有潜力。湖泊富营养化的优势在于产生低成本的、大量的、可收集的水华,这说明自然环境中的藻类资源如蓝藻水华生物质,可能作为商业中使用的生物吸附剂。

Kinetics and Equilibrium of Cu2+ Biosorption by Cyanobacterial Bloom Biomass

The biosorption characteristics of Cu2+ by cyanobacterial bloom biomass were investigated,including the biosorption kinetics as well as equilibrium isotherm.The experiment results showed that the biosorption process of Cu2+ by cyanobacterial bloom biomass may be divided into two stages,the first stage reached equilibrium very quickly,and the second stage is relatively slow.Dialytic cyanobacterial bloom biomass could remove 62.4%,78.1%,71.2%,60.35% of copper under different pH(3,4,5,6)in the reaction solution,and the maximum value of adsorption is 7.81 mg/g.The equilibrium isotherm could be well fitted by the Freundlich model.Our results implied that cyanobacterial bloom biomass was a potential candidate for low concentration Cu2+ removal from wastewater.The advantages of bloom in eutrophic freshwater-low cost,huge quantities,and easy to collect-suggest that the natural algae such as bloom biomass are the future of economical biosorbents.