title: Methyl Orange removal by a novel PEI-AuNPs-hemin nanocomposite.
abstract: A novel poly(ethyleneimine)/Au nanoparticles/hemin nanocomposite (PEI-AuNPs-Hemin) acting for Methyl Orange (MO) removal has been synthesized. PEI-AuNPs was prepared firstly and it was then linked to hemin through the coupling between carboxyl groups in hemin and amino groups in PEI without the activation of carboxyl groups. The high reactivity and stability of AuNPs contributed greatly in the formation of the amido bonds in the nanocomposite. Fourier transform infrared spectroscopy, transmission electron microscopy and UV-visible spectroscopy were used to characterize the PEI-AuNPs-Hemin. Results show that PEI-AuNPs-Hemin has strong adsorption for MO. Adsorption and degradation experiments were carried out at different pHs, nanocomposite concentrations and UV irradiation times. Removal of MO in acidic solutions was more effective than in basic solutions. The real-time study showed that the MO degradation with the nanocomposite under UV irradiation was a fast process. In addition, the photocatalytic degradation mechanism was proposed. The study suggests that the PEI-AuNPs-Hemin may have promising applications in environmental monitoring and protection.
authors.affiliation: School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China. Electronic address: weiwen_hu@163.com.
authors.forename: Weiwen
authors.initials: W
authors.lastname: Hu
authors.affiliation: School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
authors.forename: Xuehua
authors.initials: X
authors.lastname: Yu
authors.affiliation: School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Hu
authors.affiliation: School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China. Electronic address: j.kong@njust.edu.cn.
authors.forename: Jinming
authors.initials: J
authors.lastname: Kong
authors.affiliation: Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252000, China.
authors.forename: Lianzhi
authors.initials: L
authors.lastname: Li
authors.affiliation: Chemistry Department, College of Arts and Sciences, University of South Florida, FL 33620-4202, USA. Electronic address: xueji@usf.edu.
authors.forename: Xueji
authors.initials: X
authors.lastname: Zhang
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D006046:Gold / Q000737:chemistry; D006427:Hemin / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D014874:Water Pollutants, Chemical; C100258:methyl orange; D006427:Hemin; D006046:Gold
keywords: Au nanoparticle; Hemin; Methyl Orange removal; Nanocomposite; Poly(ethyleneimine)