期刊
NANOMATERIALS
卷 11, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/nano11030679
关键词
magnetic nanoparticles; crystal violet; folic acid; poly(benzofuran-co-arylacetic acid); adsorption kinetic studies
类别
资金
- Romanian Ministry of Research and Innovation [PN-19-35-02-03, 32PFE/19.10.2018]
- project: Entrepreneurship for innovation through doctoral and postdoctoral research - European Social Fund, through the Operational Program for Human Capital 2014-2020 [POCU/380/6/13/123886]
The study prepared novel polymer-based magnetic nanostructures for extracting crystal violet from aqueous solutions. Factors influencing removal efficiency were investigated, with extensive structural and performance analyses conducted.
Synthetic dyes represent a significant class of contaminants released in the environment. Crystal violet is a triarylmethane dye used in several fields such as printing inks, the textile or paper industries, as well as in cell histology. Coating magnetic nanoparticles with functionalized polymers has been proved to improve their efficiency, offering unique properties for applications in wastewater treatment. The current paper focuses on preparing and characterising magnetic core-shell nanoparticles coated with poly(benzofuran-co-arylacetic acid) functionalized with folic acid as an organic shell. The new polymer-based magnetic nanostructures were applied for crystal violet extraction from aqueous solutions. The nanostructures were structurally and morphologically investigated by Fourier-transform infrared (FTIR) spectroscopy and transmission electron microscopy (TEM). While thermal and magnetic properties of the magnetic nanostructures were determined by thermogravimetric analysis (TGA) and magnetization measurements (VSM). At the same time, crystal violet concentrations were determined by UV-VIS spectroscopy. The influence of initial dye concentration and contact time on the removal efficiency has been studied to achieve the optimum adsorption conditions. The dye adsorbent neoteric magnetic nanostructure was easily desorbed and reused, the adsorption capacity decreasing from 100% to 97.63% in the first five cycles, reaching a minimum of 88.74% after the 10th recycling step.
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