A.ferrooxidans次生矿物对水中Pb(Ⅱ)吸附性能的研究

Adsorption Capacity of Secondary Minerals Facilitated by A.ferrooxidans for Pb(Ⅱ) in Water

通过Acidithiobacillus ferrooxidans(简称A.f菌)代谢制备次生高铁矿物,研究矿物用量、吸附时间和初始Pb2+浓度对吸附性能的影响,借助等温吸附技术探讨该矿物对Pb2+的吸附平衡特征。结果表明,在Pb2+初始浓度为15 mg/L、体积为50 m L、温度30℃、pH为3.0、吸附时间为60 min、矿物用量为10 g/L的条件下,次生矿物对Pb2+的静态吸附率达90.67%,符合Langmuir静态吸附模型,最大吸附量达2.02 mg/g,吸附平衡常数(KL)为9.27 L/mg。

The secondary iron minerals was facilitated by A. ferrooxidans, the effect of the dosage of iron oxyhydrosulfate,adsorption time and initial Pb^2＋ concentration on adsorption capacity was studied and the adsorption equilibrium was characterized by isothermal adsorption technique. The results indicated that the maximum adsorption efficiency reached 90. 67% at the initial Pb^2＋ concentration of 15 mg/L,the adsorbate volume of 50 m L,the temperature of 30 ℃,pH of 3. 0,adsorption time of 60 min,iron oxyhydrosulfate dosage of 10 g/L. The Pb^2＋ adsorption process by iron oxyhydrosulfate could be well described using Langmuir isothermal adsorption model with the maximum adsorption capacity of 2. 02 mg/g and adsorption equilibrium constant of 9. 27 L/mg.