Construction of magnetic lignin-based adsorbent and its adsorption properties for dyes

Chenglong Jiang; Xiaohong Wang; Demeng Qin; Wenxin Da; Bingxia Hou; Chen Hao; Jingbo Wu

doi:10.1016/j.jhazmat.2019.02.021

Construction of magnetic lignin-based adsorbent and its adsorption properties for dyes

J Hazard Mater. 2019 May 5:369:50-61. doi: 10.1016/j.jhazmat.2019.02.021. Epub 2019 Feb 10.

Authors

Chenglong Jiang¹, Xiaohong Wang², Demeng Qin¹, Wenxin Da¹, Bingxia Hou¹, Chen Hao³, Jingbo Wu¹

Affiliations

¹ School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, China.
² School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, China. Electronic address: xhwang@ujs.edu.cn.
³ School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, China. Electronic address: chhao@ujs.edu.cn.

PMID: 30772687
DOI: 10.1016/j.jhazmat.2019.02.021

Abstract

The magnetic lignin-based adsorbent (Fe₃O₄/C-ACLS) 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.

Keywords: Adsorption; Dyes; Green; Lignosulfonate; Magnetism; chemistry.

Publication types

Research Support, Non-U.S. Gov't