Lignin/sodium alginate hydrogel for efficient removal of methylene blue

Chao Wang; Xuezhen Feng; Shibin Shang; He Liu; Zhanqian Song; Haibo Zhang

doi:10.1016/j.ijbiomac.2023.124200

Lignin/sodium alginate hydrogel for efficient removal of methylene blue

Int J Biol Macromol. 2023 May 15:237:124200. doi: 10.1016/j.ijbiomac.2023.124200. Epub 2023 Mar 25.

Authors

Chao Wang¹, Xuezhen Feng¹, Shibin Shang¹, He Liu¹, Zhanqian Song¹, Haibo Zhang²

Affiliations

¹ Institute of Chemical Industry of Forest Products, CAF, China; National Engineering Lab. for Biomass Chemical Utilization, China; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, China; Key Lab. of Biomass Energy and Material, Jiangsu Province, China; Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing 210042, China.
² Institute of Chemical Industry of Forest Products, CAF, China; National Engineering Lab. for Biomass Chemical Utilization, China; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, China; Key Lab. of Biomass Energy and Material, Jiangsu Province, China; Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing 210042, China. Electronic address: shdzhanghaibo@163.com.

PMID: 36972829
DOI: 10.1016/j.ijbiomac.2023.124200

Abstract

In this work, a class of bio-based hydrogels (LN-NH-SA hydrogel) were prepared from aminated lignin and sodium alginate. The physical and chemical properties of the LN-NH-SA hydrogel were fully characterized using field emission scanning electron microscopy, thermogravimetric analysis, fourier transform infrared spectroscopy, N₂ adsorption-desorption isotherms, and other techniques. LN-NH-SA hydrogels were tested for the adsorption of dyes (methyl orange and methylene blue). The LN-NH-SA@3 hydrogel showed better adsorption efficiency for MB with a maximum adsorption capacity of 388.81 mg·g^-1, a bio-based adsorbent with a high adsorption capacity. The adsorption process followed the pseudo-second-order model and fitted to the Freundlich isotherm equation. More importantly, LN-NH-SA@3 hydrogel maintained 87.64 % adsorption efficiency after 5 cycles. Overall, the proposed hydrogel with environmentally friendly and low cost is promising for the absorption of dye contamination.

Keywords: Aminated lignin; Bio-based hydrogel; Dye removal; Modification; Sodium alginate.

MeSH terms

Adsorption
Alginates / chemistry
Coloring Agents / chemistry
Hydrogels* / chemistry
Hydrogen-Ion Concentration
Kinetics
Lignin
Methylene Blue / chemistry
Water Pollutants, Chemical* / chemistry

Substances

Hydrogels
Lignin
Methylene Blue
Alginates
Coloring Agents
Water Pollutants, Chemical