工业水处理 ›› 2022, Vol. 42 ›› Issue (8): 113-119. doi: 10.19965/j.cnki.iwt.2021-1103

• 试验研究 • 上一篇    下一篇

钢渣-锰渣复合陶粒对Cu2+的吸附机理研究

李子木(), 李灿华(), 查雨虹, 李明晖, 都刚   

  1. 安徽工业大学冶金工程学院,安徽 马鞍山 243002
  • 收稿日期:2022-07-17 出版日期:2022-08-20 发布日期:2022-09-05
  • 作者简介:

    李子木(1998— ),硕士研究生,E-mail:

    李灿华,博士,教授,E-mail:

  • 基金资助:
    区域创新体系建设-国家创新型县市(“百城百园”)示范项目(202107d0605)

Study on the adsorption mechanism of Cu2+ by steel slag-manganese slag composite ceramics

Zimu LI(), Canhua LI(), Yuhong ZHA, Minghui LI, Gang DU   

  1. School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243002,China
  • Received:2022-07-17 Online:2022-08-20 Published:2022-09-05

摘要:

制备了钢渣-锰渣复合陶粒,研究其对含Cu2+水溶液的吸附特性。考察了钢渣-锰渣复合陶粒的材料配比、实验温度、吸附时间、搅拌速度、Cu2+初始质量浓度对吸附效果的影响,研究了钢渣-锰渣复合陶粒吸附Cu2+的等温模型和动力学模型。同时用XRD、XRF、SEM、BET对该复合陶粒进行表征,讨论钢渣-锰渣复合陶粒对Cu2+的吸附机理。结果表明,复合陶粒中含有大量硅酸化合物和碱性氧化物,同时具有较大的表面积,水解后对Cu2+有较强的吸附能力。钢渣、锰渣的最佳质量比为5∶5;温度对Cu2+的吸附过程影响较小。吸附过程中,搅拌速度在100~300 r/min范围内时,去除率随搅拌速度的增加而显著上升。平衡吸附时间为30 min,吸附效果最佳的Cu2+初始质量浓度为500 mg/L,初始质量浓度超过500 mg/L后,Cu2+去除率随初始质量浓度的升高而显著下降。钢渣-锰渣复合陶粒对Cu2+的吸附过程为单层吸附,其吸附过程符合Langmuir等温吸附模型。吸附过程中理论最大饱和吸附量为83.3 mg/g,实际最大饱和吸附量为80.69 mg/g。钢渣-锰渣复合陶粒吸附Cu2+符合准二级动力学模型,其吸附过程以化学吸附为主。

关键词: 钢渣, 锰渣, Cu2+, 陶粒, 吸附

Abstract:

Steel slag-manganese slag composite ceramsite were prepared to study the adsorption characteristics of Cu2+ containing aqueous solution. The effects of material ratio, experimental temperature, adsorption time, stirring speed and initial mass concentration of Cu2+ on the adsorption rate of steel slag-manganese slag composite ceramsite were investigated, and the isothermal and kinetic models of Cu2+ adsorption by steel slag-manganese slag composite ceramsite were studied. The composite ceramsite were also characterized by XRD, XRF, SEM and BET, and the adsorption mechanism of Cu2+ on steel slag-manganese slag composite ceramsite was discussed. The results showed that the composite ceramsite contained a large number of silicate compounds and basic oxides, and also had a large surface area. After hydrolysis, the ceramsite had a strong adsorption capacity for Cu2+. The optimal mass ratio of steel slag and manganese slag was 5∶5. The temperature has less influence on the adsorption process of Cu2+. During the adsorption process, the removal rate increased significantly with the increase of stirring speed when the stirring speed was in the range of 100-300 r/min. The equilibrium adsorption time was 30 minutes, and the initial mass concentration of Cu2+ with the best adsorption effect was 500 mg/L. After the initial mass concentration exceeded 500 mg/L, the removal rate of Cu2+ decreased significantly with the increase of the initial mass concentration. The adsorption process of Cu2+ by steel slag-manganese slag composite ceramics was monolayer adsorption, and its adsorption process was in accordance with Langmuir isothermal adsorption model. The theoretical maximum saturated adsorption amount was 83.3 mg/g and the actual maximum saturated adsorption amount was 80.69 mg/g during the adsorption process. The adsorption of Cu2+ by steel slag-manganese slag composite ceramsite was in accordance with the quasi-secondary kinetic model, and its adsorption process was mainly chemisorption.

Key words: steel slag, manganese slag, Cu2+, ceramsite, adsorption

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