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Magnetically Recyclable Wool Keratin Modified Magnetite Powders for Efficient Removal of Cu2+ Ions from Aqueous Solutions

by 1,2,†, 1, 2,3, 2,3, 3, 4 and 2,3,*,†
1
School of Environmental and Chemical Engineering, Xi′an Polytechnic University, Xi′an, Shaanxi 710048, China
2
Research Centre for Functional Textile Materials, School of Textile Science and Engineering, Xi’an Polytechnic University, Xi’an, Shaanxi 710048, China
3
Key Laboratory of Functional Textile Material and Product, Xi’an Polytechnic University, Ministry of Education, Xi’an, Shaanxi 710048, China
4
Performance Textiles and Clothing Research Group, School of Design, University of Leeds, Leeds LS2 9JT, UK
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Diego Cazorla-Amorós
Nanomaterials 2021, 11(5), 1068; https://doi.org/10.3390/nano11051068
Received: 17 March 2021 / Revised: 15 April 2021 / Accepted: 16 April 2021 / Published: 21 April 2021
(This article belongs to the Section Environmental Nanoscience and Nanotechnology)
The treatment of wastewater containing heavy metals and the utilization of wool waste are very important for the sustainable development of textile mills. In this study, the wool keratin modified magnetite (Fe3O4) powders were fabricated by using wool waste via a co-precipitation technique for removal of Cu2+ ions from aqueous solutions. The morphology, chemical compositions, crystal structure, microstructure, magnetism properties, organic content, and specific surface area of as-fabricated powders were systematically characterized by various techniques including field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), thermogravimetric (TG) analysis, and Brunauer–Emmett–Teller (BET) surface area analyzer. The effects of experimental parameters such as the volume of wool keratin hydrolysate, the dosage of powder, the initial Cu2+ ion concentration, and the pH value of solution on the adsorption capacity of Cu2+ ions by the powders were examined. The experimental results indicated that the Cu2+ ion adsorption performance of the wool keratin modified Fe3O4 powders exhibited much better than that of the chitosan modified ones with a maximum Cu2+ adsorption capacity of 27.4 mg/g under favorable conditions (0.05 g powders; 50 mL of 40 mg/L CuSO4; pH 5; temperature 293 K). The high adsorption capacity towards Cu2+ ions on the wool keratin modified Fe3O4 powders was primarily because of the strong surface complexation of –COOH and –NH2 functional groups of wool keratins with Cu2+ ions. The Cu2+ ion adsorption process on the wool keratin modified Fe3O4 powders followed the Temkin adsorption isotherm model and the intraparticle diffusion and pseudo-second-order adsorption kinetic models. After Cu2+ ion removal, the wool keratin modified Fe3O4 powders were easily separated using a magnet from aqueous solution and efficiently regenerated using 0.5 M ethylene diamine tetraacetic acid (EDTA)-H2SO4 eluting. The wool keratin modified Fe3O4 powders possessed good regenerative performance after five cycles. This study provided a feasible way to utilize waste wool textiles for preparing magnetic biomass-based adsorbents for the removal of heavy metal ions from aqueous solutions. View Full-Text
Keywords: magnetite (Fe3O4); wool keratin; Cu2+ ions; adsorption magnetite (Fe3O4); wool keratin; Cu2+ ions; adsorption
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MDPI and ACS Style

Zhang, X.; Guo, Y.; Li, W.; Zhang, J.; Wu, H.; Mao, N.; Zhang, H. Magnetically Recyclable Wool Keratin Modified Magnetite Powders for Efficient Removal of Cu2+ Ions from Aqueous Solutions. Nanomaterials 2021, 11, 1068. https://doi.org/10.3390/nano11051068

AMA Style

Zhang X, Guo Y, Li W, Zhang J, Wu H, Mao N, Zhang H. Magnetically Recyclable Wool Keratin Modified Magnetite Powders for Efficient Removal of Cu2+ Ions from Aqueous Solutions. Nanomaterials. 2021; 11(5):1068. https://doi.org/10.3390/nano11051068

Chicago/Turabian Style

Zhang, Xinyue, Yani Guo, Wenjun Li, Jinyuan Zhang, Hailiang Wu, Ningtao Mao, and Hui Zhang. 2021. "Magnetically Recyclable Wool Keratin Modified Magnetite Powders for Efficient Removal of Cu2+ Ions from Aqueous Solutions" Nanomaterials 11, no. 5: 1068. https://doi.org/10.3390/nano11051068

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