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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front. Chem. Sci. Eng.    2023, Vol. 17 Issue (7) : 954-965    https://doi.org/10.1007/s11705-023-2311-2
RESEARCH ARTICLE
Investigation of the roles of lignin in biomass-based hydrogel for efficient desalination
Qizhao Shao, Lan Sun, Xinzhou Wu, Dafeng Zheng()
School of Chemistry and Chemical Engineering, Guangdong Engineering Research Center for Green Fine Chemicals, South China University of Technology, Guangzhou 510640, China
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Abstract

The shortage of freshwater has become a global challenge, and solar-driven interfacial evaporation for desalination is a promising way to alleviate the crisis. To develop highly efficient and environmentally friendly photothermal evaporator, the hydroxyethyl cellulose (HEC)/alkaline lignin (AL)/graphene oxide (GO) hydrogels (CLGs) with remarkable evaporative performance were successfully fabricated by a facile sol–gel method using biomass residues. The influence of AL content on the physicochemical properties of the evaporator was investigated. The increasing content of AL improves the mechanical properties, saturated water content and crosslink density of the hydrogels. The designed materials exhibit outstanding thermal insulation capacity (the thermal conductivity of less than 0.05 W·m–1·K–1) and high light absorption capacity of more than 97%. The solar evaporation efficiency and water evaporation rate of the HEC/64 wt % of AL/GO hydrogels (CLG4) achieve 92.1% and 2.55 kg·m–2·h–1 under 1 sun, respectively. The salt resistance test results reveal that the evaporation rate of the CLG4 can still reach 2.44 kg·m–2·h–1 in 3.5 wt % NaCl solution. The solar evaporation rate of the CLG4 can maintain in the range of 2.45–2.59 kg·m–2·h–1 in five cycles. This low-cost lignin-based photothermal evaporator offers a sustainable strategy for desalination.

Keywords lignin      photothermal      cellulose      desalination      hydrogel     
Corresponding Author(s): Dafeng Zheng   
About author:

* These authors contributed equally to this work.

Just Accepted Date: 24 April 2023   Online First Date: 12 June 2023    Issue Date: 05 July 2023
 Cite this article:   
Qizhao Shao,Lan Sun,Xinzhou Wu, et al. Investigation of the roles of lignin in biomass-based hydrogel for efficient desalination[J]. Front. Chem. Sci. Eng., 2023, 17(7): 954-965.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-023-2311-2
https://academic.hep.com.cn/fcse/EN/Y2023/V17/I7/954
Fig.1  The preparation process and reaction mechanism of the CLG1.
Fig.2  SEM images of the (a, c, e, g and i) interior and (b, d, f, h and j) surface of the CLGs: (a, b) CLG1, (c, d) CLG2, (e, f) CLG3, (g, h) CLG4, (i, j) CLG5.
Fig.3  Elastic moduli G as a function of frequency measured.
Fig.4  FTIR spectra of the (a) HEC and AL and (b) CLGs.
Fig.5  (a) Surface water contact angle of CLGs; (b) internal wettability test of the CLGs.
Fig.6  (a) Light absorption spectra of the CLGs in the wavelength range of 300–2500 nm; (b) thermal conductivity of the CLGs.
Fig.7  (a) Illustration of photothermal evaporation process; (b) equivalent evaporation enthalpy of the water and CLGs; (c) water evaporation rate of the water and CLGs in dark condition.
SamplesEvaporation rate/(kg·m–2·h–1)Evaporation efficiency/%Ref.
Lignin hydrogel-based evaporator2.2591.6[32]
Biomass-derived evaporator1.7890.6[51]
MnO2 NWs/chitosan hydrogels1.7292.5[52]
Biomass photothermal evaporator1.4289.3[53]
Hydrogel-derived evaporator1.3583[54]
CLG42.5592.1This work
Tab.1  The comparison of evaporation performance of CLG4 under 1 sun and previous work
Fig.8  (a) The mass change of water under 1 sun; (b) the surface temperature rises of the CLGs relative to heating time under 1?sun; (c) the infrared photographs of the CLGs surface in different times under 1 sun.
Fig.9  (a) The evaporation rate and efficiency of the CLGs under 1 sun; (b) the evaporation rate of the CLG4 under different sunlight intensity; (c) the circulating water evaporation data of the CLG4; (d) concentrations of ions in the artificial seawater via solar evaporation using the CLG4.
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