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    王晓佳, 王百田, 李德宁, 曹远博. 聚丙稀酰胺高吸附树脂与重金属离子的相互作用[J]. 北京林业大学学报, 2016, 38(3): 81-88. DOI: 10.13332/j.1000-1522.20150362
    引用本文: 王晓佳, 王百田, 李德宁, 曹远博. 聚丙稀酰胺高吸附树脂与重金属离子的相互作用[J]. 北京林业大学学报, 2016, 38(3): 81-88. DOI: 10.13332/j.1000-1522.20150362
    WANG Xiao-jia, WANG Bai-tian, LI De-ning, CAO Yuan-bo. Interaction between polyacrylamide super absorbent polymers and heavy metal ions[J]. Journal of Beijing Forestry University, 2016, 38(3): 81-88. DOI: 10.13332/j.1000-1522.20150362
    Citation: WANG Xiao-jia, WANG Bai-tian, LI De-ning, CAO Yuan-bo. Interaction between polyacrylamide super absorbent polymers and heavy metal ions[J]. Journal of Beijing Forestry University, 2016, 38(3): 81-88. DOI: 10.13332/j.1000-1522.20150362

    聚丙稀酰胺高吸附树脂与重金属离子的相互作用

    Interaction between polyacrylamide super absorbent polymers and heavy metal ions

    • 摘要: 为探究高吸附树脂对重金属离子的吸附能力,用聚丙烯酰胺高吸附树脂对Cu(NO3)2、Pb(NO3)2标准溶液进行吸附,研究高吸附树脂与Cu2+、Pb2+的相互作用关系。结果表明:高吸附树脂吸水倍率随Cu2+、Pb2+浓度增大而显著减小,两者之间存在显著幂函数关系。离子吸附量随Cu2+、Pb2+浓度增大而显著增大,吸附平衡时Cu2+、Pb2+的最大吸附量分别为131.72、242.68 mg/g,高吸附树脂吸附过程符合Freundlich等温吸附方程。高吸附树脂对Cu2+、Pb2+的吸附量随时间增加而增大,吸附速率逐渐减小,吸附动力学可用准二级动力学方程描述。相同质量浓度下,高吸附树脂对Pb2+的吸附量和吸附速率均大于Cu2+。吸水凝胶在去离子水中和硝酸溶液中解吸很快,大约1 h后达到平衡,高吸附树脂在去离子水中解吸率不高,但在1 mol/L HNO3溶液中Cu2+、Pb2+解吸率均大于85%。高吸附树脂3次重复吸附后,Cu2+、Pb2+平衡吸附量分别为第1次吸附量的75.36%和78.12%,重复吸附性能良好。研究结果可为高吸附树脂应用于含有重金属的污水处理和土壤修复提供参考。

       

      Abstract: In order to study the adsorption capacity of super absorbent polymers to heavy metals, the polyacrylamide super absorbent polymers were put into standard solutions of Cu(NO3)2 and Pb(NO3)2. The interaction between super absorbent polymers and Cu2+ and Pb2+was investigated. The results indicated that water absorbency of the super absorbent polymers decreased with the increase of the concentration of Cu2+ and Pb2+. There was a significant power function relationship between water absorbency and ion concentration. Ions adsorption amounts increased significantly with the increase of the concentration of Cu2+ and Pb2+. The maximum adsorption amounts of Cu2+ and Pb2+ were 131.72 and 242.68 mg/g, respectively. The adsorption process of super absorbent polymers was in accordance with the Freundlich isotherm equation. The adsorption amounts of Cu2+ and Pb2+ of the super absorbent polymers increased over time, and the adsorption speed decreased gradually. The kinetic curves of adsorption can be described by quasi two-level dynamic equation. In the same mass concentration, both adsorption amounts and adsorption speed of Pb2+ were higher than those of Cu2+. Gels released Cu2+ and Pb2+ very fast, reaching balance in one hour. The desorption rate was not high in deionized water, but in 1 mol/L HNO3 solution, the desorption rates of Cu2+ and Pb2+ were all higher than 85%. After three times of replication, super absorbent polymers’ equilibrium amounts of adsorption to Cu2+ and Pb2+ were about 75% and 78% of the first time. These results indicate that super absorbent polymers have practical value in wastewater treatment and remediation of soil containing heavy metals.

       

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