Lignin-modified metal-organic framework as an effective adsorbent for the removal of methyl orange

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

doi:10.1016/j.ijbiomac.2023.126092

Lignin-modified metal-organic framework as an effective adsorbent for the removal of methyl orange

Int J Biol Macromol. 2023 Oct 1:250:126092. doi: 10.1016/j.ijbiomac.2023.126092. Epub 2023 Aug 3.

Authors

Chao Wang¹, Chen Xing², Xuezhen Feng¹, Shibin Shang¹, He Liu¹, Zhanqian Song¹, Haibo Zhang³

Affiliations

¹ Institute of Chemical Industry of Forest Products, CAF, National Engineering Lab. for Biomass Chemical Utilization, Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Key Lab. of Biomass Energy and Material, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing 210042, Jiangsu Province, China.
² Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, China.
³ Institute of Chemical Industry of Forest Products, CAF, National Engineering Lab. for Biomass Chemical Utilization, Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Key Lab. of Biomass Energy and Material, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing 210042, Jiangsu Province, China. Electronic address: shdzhanghaibo@163.com.

PMID: 37541462
DOI: 10.1016/j.ijbiomac.2023.126092

Abstract

Herein, lignin-modified metal-organic frameworks (NH₂-UIO@L) are prepared using a one-step synthesis as sorbents for the removal of organic dyes from water. The introduction of lignin improved the adsorption sites. NH₂-UIO@L₂ adsorption of MO conforms to Langmuir model, and the adsorption capacity of NH₂-UIO@L₂ on MO was 214.13 mg·L^-1 with an adsorption efficiency up to 99.28 %, which was significantly higher than values for other adsorbents. Due to hydrogen bonds, π-π interactions and electrostatic interactions, MO was effectively removed by NH₂-UIO@L₂ and its adsorption efficiency is maintained at 90.55 % after six cycles. The adsorption kinetics showed that the NH₂-UIO@L₂ adsorption of MO was chemical adsorption and controlled by intraparticle diffusion and external mass transfer. Further, the adsorption performance of NH₂-UIO@L₂ on MO and MB in mixed MO/MB solution was investigated. The adsorption capacity of NH₂-UIO@L₂ in mixed MO/MB solution was 207.04 mg·L^-1 for MO and 243.31 mg·L^-1 for MB; the adsorption of NH₂-UIO@L₂ on MO followed the Dubinin-Radushkevich and pseudo-second-order models, and the adsorption on MB followed the Temkin and pseudo-second-order models. Hydrogen bonds, π-π interactions, and pore filling are all implicated in the removal of MO and MB. In particular, the electrostatic attraction between MB and MO improves the adsorption efficiency of NH₂-UIO@L₂ on MB. NH₂-UIO@L₂ has good reusability, maintaining an adsorption efficiency of 97.66 % for MO and up to 99.15 % for MB after six cycles. Its simple preparation and superior adsorption suggest that NH₂-UIO@L₂ has considerable potential to remove organic dyes from wastewater.

Keywords: Adsorption; Adsorption mechanism; Lignin-modified metal-organic frameworks; Reusability.