2011年11月
Study of the removal of Pb2+ from aqueous solution by poly-γ-glutamic acid coated magnetic nanoparticles
Huanjing Kexue/Environmental Science
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- 巻
- 32
- 号
- 11
- 開始ページ
- 3348
- 終了ページ
- 3356
- 記述言語
- 中国語
- 掲載種別
- 研究論文(学術雑誌)
- 出版者・発行元
- 11
In this study, a novel low cost magnetic adsorbent material prepared by poly-γ-glutamic acid(γ-PGA) coating Fe3O4 magnetic particles, which was called coated magnetic namoparticles(PG-M) was developed for the removal of Pb2+ from water by Dr. Yasuzawa. The particle size of PG-M was about 120-320 nm, and there was no significant difference in Fe3O4 and PG-M particle size, Fe3O4 was only as the support of PG-M core and did not directly involve in the reaction. The shape of PG-M was irregular cubic structure. The experiments were applied to quantify adsorptive time, pH, competitive ion and organics on the removal effect of Pb2+. The results showed that PG-M was effective in removal of Pb2+
the equilibrium amount of adsorptive was as high as 93.3 mg/g and the optimized condition of pH value for metal ions removal was 7.0, while contact time was about 45 min. The removal efficiency of Pb2+ was not significantly influenced by Na+ while was reduced with the increasing concentration of Ca2+. The removal of Pb2+ was enhanced with the presence of organic matter(humic acid, HA) when the concentration of HA was below 5 mg/L, and decreased when the concentration of HA exceeded 5 mg/L. Langmuir isotherms fitted the experimental data better compared to Freundlich isotherms. Pseudo second order model well described the sorption kinetics of Pb2+. The used PG-M can be desorbed by 0.1mol/L HCl and became reusable. PG-M is nontoxic and eco-friendly, which have a good prospect in water treatment.
the equilibrium amount of adsorptive was as high as 93.3 mg/g and the optimized condition of pH value for metal ions removal was 7.0, while contact time was about 45 min. The removal efficiency of Pb2+ was not significantly influenced by Na+ while was reduced with the increasing concentration of Ca2+. The removal of Pb2+ was enhanced with the presence of organic matter(humic acid, HA) when the concentration of HA was below 5 mg/L, and decreased when the concentration of HA exceeded 5 mg/L. Langmuir isotherms fitted the experimental data better compared to Freundlich isotherms. Pseudo second order model well described the sorption kinetics of Pb2+. The used PG-M can be desorbed by 0.1mol/L HCl and became reusable. PG-M is nontoxic and eco-friendly, which have a good prospect in water treatment.
- リンク情報
- ID情報
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- ISSN : 0250-3301
- PubMed ID : 22295634
- SCOPUS ID : 81555225309