用铁矾渣吸附去除废水中Mo(Ⅵ)试验研究

Adsorption and Removal of Mo(Ⅵ)from Wastewater by Jarosite

研究了以锌浸出液沉铁后的铁矾渣为吸附材料去除废水中Mo(Ⅵ),考察了模拟废水初始pH和Mo(Ⅵ)初始质量浓度、铁矾渣用量、吸附时间对铁矾渣吸附Mo(Ⅵ)的影响,并探讨了吸附动力学。结果表明:在废水中Mo(Ⅵ)初始质量浓度40 mg/L、pH=3.0、吸附剂用量1.0 g/L、吸附时间240 min条件下,铁矾渣对Mo(Ⅵ)的吸附量可达13.21 mg/g;铁矾渣对废水中Mo(Ⅵ)的吸附过程更适合用准二级动力学模型描述,属于化学吸附;铁矾渣吸附钼过程更遵循Langmuir等温吸附模型,有较高的拟合精度,吸附过程属于单层分子吸附。该法工艺简单,成本较低,有望实现废渣高值化循环利用。

The removal of Mo(Ⅵ)from wastewater was studied by using jarosite after iron deposition in zinc leaching solution as adsorption material.The effects of the initial pH of simulated wastewater,the initial mass concentration of Mo(Ⅵ),the additon amount of jarosite and the adsorption time on the adsorption of Mo(Ⅵ)by jarosite were investigated,and the kinetic mechanism of the adsorption process was discussed.The results show that under the conditions of initial mass concentration of Mo(Ⅵ)of 40 mg/L,pH=3.0,additon amount of jarosite of 1.0 g/L and adsorption time of 240 min,the adsorption capacity of Mo(Ⅵ)can reach 13.21 mg/g.The adsorption process of Mo(Ⅵ)in wastewater by jarosite is more suitable to be described by quasi-second-order kinetic model,which belongs to chemical adsorption.The adsorption process of molybdenum by jarosite follows the Langmuir isothermal adsorption model and has higher fitting accuracy.The adsorption process belongs to monolayer molecular adsorption.This method has the advantages of simple process and low cost,and is expected to realize high-value recycling of waste residue.