Construction of Cu-N coordination into natural biopolymer lignin backbone for highly efficient and selective removal of cationic dyes

Lijun Li; Xin Liu; Tong Duan; Feng Xu; Ali Abdulkhani; Xueming Zhang

doi:10.1016/j.biortech.2023.128841

Construction of Cu-N coordination into natural biopolymer lignin backbone for highly efficient and selective removal of cationic dyes

Bioresour Technol. 2023 May:376:128841. doi: 10.1016/j.biortech.2023.128841. Epub 2023 Mar 9.

Authors

Lijun Li¹, Xin Liu², Tong Duan¹, Feng Xu¹, Ali Abdulkhani³, Xueming Zhang⁴

Affiliations

¹ Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China; Engineering Research Center of Forestry Biomass Materials and Energy, Ministry of Education, Beijing Forestry University, Beijing 100083, China.
² Key Lab for Industrial Biocatalysis, Ministry of Education, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
³ Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran.
⁴ Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China; Engineering Research Center of Forestry Biomass Materials and Energy, Ministry of Education, Beijing Forestry University, Beijing 100083, China. Electronic address: xm_zhang@bjfu.edu.cn.

PMID: 36898563
DOI: 10.1016/j.biortech.2023.128841

Abstract

Here, a Cu²⁺-doped lignin-based adsorbent (Cu-AL) was fabricated via the amination and Cu²⁺-doping of industrial alkali lignin for massive and selective adsorption of cationic dyes azure B (AB) and saffron T (ST). The Cu-N coordination structures endowed Cu-AL with stronger electronegativity and higher dispersity. Through the electrostatic attraction, π-π interaction, H-bonding, and Cu²⁺ coordination, the adsorption capacities of AB and ST reached up to 1168 and 1420 mg g^-1, respectively. The pseudo-second-order model and Langmuir isotherm model were more relevant to the AB and ST adsorption on Cu-AL. Based on the thermodynamic study, the adsorption progresses were endothermic, spontaneous, and feasible. The Cu-AL maintained high removal efficiency to dyes after 4 reuses (>80%). Importantly, the Cu-AL could efficiently remove and separate AB and ST from dye mixtures even in real time. All the above characteristics demonstrated that Cu-AL was an excellent adsorbent for fast wastewater treatment.

Keywords: Adsorbent; Cationic dyes; Cu(2+)-doping; Lignin; Selective adsorption.

MeSH terms

Adsorption
Coloring Agents* / chemistry
Kinetics
Lignin / chemistry
Thermodynamics
Water Pollutants, Chemical* / chemistry

Substances

Coloring Agents
Lignin
Water Pollutants, Chemical