Fabrication of Poly(γ-glutamic acid)-coated Fe3O4 Magnetic Nanoparticles and Their Application in Heavy Metal Removal

doi:10.1016/S1004-9541(13)60629-1

Chin.J.Chem.Eng. ›› 2013, Vol. 21 ›› Issue (11): 1244-1250.DOI: 10.1016/S1004-9541(13)60629-1

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Fabrication of Poly(γ-glutamic acid)-coated Fe₃O₄ Magnetic Nanoparticles and Their Application in Heavy Metal Removal

CHANG Jing¹, ZHONG Zhaoxiang¹, XU Hong¹, YAO Zhong¹, CHEN Rizhi²

1 College of Food Science and Light Industry, Nanjing University of Technology, Nanjing 210009, China;
2 State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu Key Laboratory of Industrial Water-Conservation & Emission Reduction, Nanjing University of Technology, Nanjing 210009, China

Received:2013-03-20 Revised:2013-08-23 Online:2013-11-26 Published:2013-11-28
Contact: ZHONG Zhaoxiang，XU Hong
Supported by:
Supported by the National Natural Science Foundation of China (21276124), the Research Project of Natural Science for Universities Affiliated to Jiangsu Province (10KJB530002), Key Projects in the National Science & Technology Pillar Program (2011BAE07B09-3), the Jiangsu Provincial Science and Technology Support Program (BE2011831), and the State High Technology Research and Development Program of China (2011AA02A201).

Fabrication of Poly(γ-glutamic acid)-coated Fe₃O₄ Magnetic Nanoparticles and Their Application in Heavy Metal Removal

常菁¹, 仲兆祥¹, 徐虹¹, 姚忠¹, 陈日志²

1 College of Food Science and Light Industry, Nanjing University of Technology, Nanjing 210009, China;
2 State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu Key Laboratory of Industrial Water-Conservation & Emission Reduction, Nanjing University of Technology, Nanjing 210009, China

通讯作者: ZHONG Zhaoxiang，XU Hong
基金资助:
Supported by the National Natural Science Foundation of China (21276124), the Research Project of Natural Science for Universities Affiliated to Jiangsu Province (10KJB530002), Key Projects in the National Science & Technology Pillar Program (2011BAE07B09-3), the Jiangsu Provincial Science and Technology Support Program (BE2011831), and the State High Technology Research and Development Program of China (2011AA02A201).

Abstract

Abstract: In this study, poly(γ-glutamic acid)-coated Fe₃O₄ magnetic nanoparticles (γ-PGA/Fe₃O₄ MNPs) were successfully fabricated using the co-precipitation method. Fe₃O₄ MNPs were also prepared for comparison. The average size and specific surface area results reveal that γ-PGA/Fe₃O₄ MNPs (52.4 nm, 88.41 m²·g^-1) have smaller particle size and larger specific surface area than Fe₃O₄ MNPs (62.0 nm, 76.83 m²·g^-1). The γ-PGA/Fe₃O₄ MNPs can remove over 99% of Cr³⁺, Cu²⁺ and Pb²⁺, and over 77% of Ni²⁺ in deionized water, much higher than γ-PGA and Fe₃O₄ MNPs, attributed to the larger specific surface area of γ-PGA/Fe₃O₄ MNPs. With the solution pH higher than 6.0, γ-PGA/Fe₃O₄ MNPs demonstrate better removal activity. The adsorption isotherm of γ-PGA/Fe₃O₄ MNPs for Cr³⁺ fits the Freundlich model well, with the adsorption capacity of 24.60 mg·g^-1. γ-PGA/Fe₃O₄ MNPs are strongly attracted by permanent magnet, so it is easy to separate them completely from water. With their high efficiency for heavy metal removal and easier separation, γ-PGA/Fe₃O₄ MNPs have great potential applications in water treatment.

Key words: &gamma, -PGA, magnetic nanoparticles, Fe₃O₄, heavy metal removal

摘要： In this study, poly(γ-glutamic acid)-coated Fe₃O₄ magnetic nanoparticles (γ-PGA/Fe₃O₄ MNPs) were successfully fabricated using the co-precipitation method. Fe₃O₄ MNPs were also prepared for comparison. The average size and specific surface area results reveal that γ-PGA/Fe₃O₄ MNPs (52.4 nm, 88.41 m²·g^-1) have smaller particle size and larger specific surface area than Fe₃O₄ MNPs (62.0 nm, 76.83 m²·g^-1). The γ-PGA/Fe₃O₄ MNPs can remove over 99% of Cr³⁺, Cu²⁺ and Pb²⁺, and over 77% of Ni²⁺ in deionized water, much higher than γ-PGA and Fe₃O₄ MNPs, attributed to the larger specific surface area of γ-PGA/Fe₃O₄ MNPs. With the solution pH higher than 6.0, γ-PGA/Fe₃O₄ MNPs demonstrate better removal activity. The adsorption isotherm of γ-PGA/Fe₃O₄ MNPs for Cr³⁺ fits the Freundlich model well, with the adsorption capacity of 24.60 mg·g^-1. γ-PGA/Fe₃O₄ MNPs are strongly attracted by permanent magnet, so it is easy to separate them completely from water. With their high efficiency for heavy metal removal and easier separation, γ-PGA/Fe₃O₄ MNPs have great potential applications in water treatment.

关键词: &gamma, -PGA, magnetic nanoparticles, Fe₃O₄, heavy metal removal

CHANG Jing, ZHONG Zhaoxiang, XU Hong, YAO Zhong, CHEN Rizhi. Fabrication of Poly(γ-glutamic acid)-coated Fe₃O₄ Magnetic Nanoparticles and Their Application in Heavy Metal Removal[J]. Chin.J.Chem.Eng., 2013, 21(11): 1244-1250.

常菁, 仲兆祥, 徐虹, 姚忠, 陈日志. Fabrication of Poly(γ-glutamic acid)-coated Fe₃O₄ Magnetic Nanoparticles and Their Application in Heavy Metal Removal[J]. Chinese Journal of Chemical Engineering, 2013, 21(11): 1244-1250.

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Fabrication of Poly(γ-glutamic acid)-coated Fe₃O₄ Magnetic Nanoparticles and Their Application in Heavy Metal Removal

Fabrication of Poly(γ-glutamic acid)-coated Fe₃O₄ Magnetic Nanoparticles and Their Application in Heavy Metal Removal

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