Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 369, Issue -, Pages 50-61Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2019.02.021
Keywords
Green; chemistry; Magnetism; Adsorption; Lignosulfonate; Dyes
Categories
Funding
- National Natural Science Foundation of China [61571245]
- Natural Science Foundation of Jiangsu Province [BK20131249]
- Senior Personnel Scientific Research Foundation of Jiangsu University [15JDG084]
- Natural Science Fund Project of Colleges in Jiangsu Province [16KJB430008]
- College Students Innovative Practice Fund of Jiangsu University Industrial Center [ZXJG2018112]
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The magnetic lignin-based adsorbent (Fe3O4/C-ACTS) has been successfully prepared and applied to adsorbing azo dyes Congo red, Titan yellow and Eriochrome blue black R. The samples were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), X-ray powder diffraction (XRD), vibration sample magnetometer (VSM), Raman spectroscopy and elemental analysis. In the process of adsorption, five kinds of influencing factors and recycling regeneration were discussed, and the adsorption mechanisms such as kinetics, isotherm, thermodynamics were explored. The results show that Fe3O4/C-ACLS can remove 98%, 92% and 99% of Congo red, Titan yellow and Eriochrome blue black R, respectively. Under the same conditions, the removal rate was 87%, 84% and 88% after 5 times adsorption cycle, respectively. Pseudo-first-order, pseudo-second-order kinetics, Elovich model and intraparticle diffusion model were studied, and the results show that the adsorption process conforms to pseudo-second-order kinetics model, and the diffusion rate is controlled by many steps. The results of isotherm model and thermodynamics show that the adsorption process is consistent with Langmuir model and is mainly a spontaneous chemical endothermic process of monolayer.
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