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| Adsorption of Lead Ions in Effluent onto Lignin Amines Adsorbents from Modified Kraft Lignin |
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| DOI：10.11981/j.issn.1000-6842.2011.02.53 |
| Key Words:lignin; lignin amine; adsorption; Pb2+ |
| Fund Project:本课题得到教育部科学技术研究重点项目(210165)及广西教育厅科研项目(200911MS69)的资助。 |
| Author Name | Affiliation | | 刘祖广 | 广西民族大学化学与生态工程学院，广西南宁，530006 | | 吕施贤 | 广西民族大学化学与生态工程学院，广西南宁，530006 | | 闫晓雪 | 广西民族大学化学与生态工程学院，广西南宁，530006 | | 张太顺 | 广西民族大学化学与生态工程学院，广西南宁，530006 | | 曾 薇 | 广西民族大学化学与生态工程学院，广西南宁，530006 |
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| Abstract: |
| Lignin amine adsorbents were synthesized from kraft lignin, diethylenetriamine and formaldehyde via Mannich reaction. The effect of different conditions on the adsorption of Pb2+ was investigated. The results showed that the lignin amine with n(lignin)∶n(diethylenetriamine)∶n (formaldehyde) = 1∶1.5∶4.5 had the best adsorbing efficiency among three different lignin absorbents. The optimum adsorption conditions were as follows: adsorption temperature was 45℃, the amount of adsorbents was 1.2 g/L, pH was 5.0 and the adsorption time was 24 hours. Under these conditions the removal of Pb2+ reached 59.82%, the adsorption capacity was 49.85 mg/g. This adsorption process was chronic adsorption, the dynamic model was consistent with McKay secondary adsorption kinetics. The adsorption of Pb2+ on lignin amine was affected by the intraparticle diffusion and liquid film diffusion, and the intraparticle diffusion was the main rate-controlling step. |
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