期刊论文

Adsorption performance and mechanism of Cr(Ⅵ)by aluminum sludge composite gel spheres

中文

精细化工

1003-5214

2021

38

07

1450-1458

10.13550/j.jxhg.20200875

国家自然科学基金项目（21177053）； 湖南省研究生科研创新项目资助（CX20200940）；

本校为第一机构

以铝污泥、聚乙烯醇、海藻酸钠为原料,采用溶胶-凝胶、冷冻干燥技术制备铝污泥基复合凝胶球(AS-GEL),用于吸附溶液中Cr(Ⅵ)。通过静态吸附实验探究pH、AS-GEL投加量、初始质量浓度、温度、吸附时间、共存阴离子浓度对AS-GEL吸附Cr(Ⅵ)的影响。采用SEM、FTIR、XPS对AS-GEL吸附Cr(Ⅵ)的机理进行分析。结果表明,在pH=4、AS-GEL投加量为1.2 g/L、Cr(Ⅵ)初始质量浓度200 mg/L、温度为35 ℃、吸附时间为120 min、无其他阴离子共存的条件下,AS-GEL对Cr(Ⅵ)的最大吸附量为73.364 mg/g。共存阴离子影响顺序为PO_4~(3-)>NO_3~->Cl~-。吸附过程符合Langmuir等温吸附模型和准一级、准二级动力学方程。其主要...

Aluminum sludge composite gel spheres(AS-GEL)for the adsorption of Cr(Ⅵ)in the solution was prepared by sol-gel,freeze-drying technology using aluminum sludge,polyvinyl alcohol and sodium alginate as raw materials. The effects of solution pH,dosage of AS-GEL,initial mass concentration of Cr(Ⅵ)solution,temperature,adsorption time,and coexisting anion concentration on the adsorption of Cr(Ⅵ)were explored by static adsorption experiments. The mechanism was analyzed by SEM,FTIR and XPS. The results showed that under the conditions of pH=4,AS-GEL...