Preparation of wood-based hydrogel membranes for efficient purification of complex wastewater using a reconstitution strategy

doi:10.1007/s11783-024-1844-z

2024, Vol. 18

Issue (7) : 84 https://doi.org/10.1007/s11783-024-1844-z

Preparation of wood-based hydrogel membranes for efficient purification of complex wastewater using a reconstitution strategy

Qian He¹, Junkai Gao¹(

), Zhongzhi Chen², Yuanjing Ding¹, Mengsheng Xia², Pengtao Xu¹, Yan Chen¹(

)

¹. School of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan 316022, China
². InnoTech Alberta, P.O. Box 4000, Hwy 16A & 75 Street, Vegreville, AB T9C 1T4, Canada

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Abstract

● Wood powder reconstitution strategy was developed to prepare hydrogel membrane.

● The membrane has the merits of adjustable pore size and superhydrophilicity.

● The reconstitution strategy is environmentally friendly and easy to operate.

● The membrane can purify complex wastewater and has excellent anti-fouling property.

● This study opened up a new strategy for the recycling of waste wood powder.

To avoid resource wastage and secondary environmental pollution, recycling and reusing waste wood powder is still a great challenge. Moreover, the poor viscosity and irregular pore size of wood powder limit its practical application. This study employed a green and convenient wood powder reconstitution strategy to achieve highly adhesive bonding and pore size control between wood powder particles, thus preparing a high-strength and super hydrophilic wood powder membrane. The wood powder fibers were partially dissolved and regenerated to create a reconstituted wood powder hydrogel membrane, using waste wood powder as the raw material. The wood powder reconstitution strategy offers advantages such as environmental friendliness, simplicity, cost-effectiveness, and strong universality. Furthermore, the materials exhibit excellent self-cleaning properties and superhydrophilicity. Driven by gravity, the membrane can purify oily wastewater and dyes. Additionally, the reconstitution strategy offers a new pathway for recycling wood powder.

Keywords Wood powder Reconstitution strategy Hydrogel membrane Recycling Wastewater

Corresponding Author(s): Junkai Gao,Yan Chen

Issue Date: 08 April 2024

Cite this article:

Qian He,Junkai Gao,Zhongzhi Chen, et al. Preparation of wood-based hydrogel membranes for efficient purification of complex wastewater using a reconstitution strategy[J]. Front. Environ. Sci. Eng., 2024, 18(7): 84.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-024-1844-z
https://academic.hep.com.cn/fese/EN/Y2024/V18/I7/84

Fig.1 Schematic diagram of preparing hydrogel membrane from discarded wood powder.

Fig.2 (a, d) SEM images of 3N-WP surface morphologies. (b, e) SEM images of D-3N-WP surface morphologies. (c, f) SEM images of RWPM surface morphologies. (g, h, i) Cross-sectional SEM images of 3N-WP, D-3N-WP, and RWPM membranes.

Fig.3 (a) FTIR spectra of the fibers. (b) XRD patterns of the fibers. (c) XPS survey spectra of the fibers. (d−f) C 1s spectrum of 3N-WP, D-3N-WP, and RWPM, respectively.

Fig.4 (a) Schematic diagram of molecular structure change during partial dissolution and regeneration of cellulose. (b) Schematic diagram of hydrogen bond network reconstruction in cellulose. (c) Diagrammatic sketch of the elements.

Fig.5 (a) Comparison of 3N-WP membranes before and after bending and curling. (b) Comparison of RWPM membranes before and after bending and curling. (c) Stress-strain curves of three groups: RWPM, D-3N-WP, and 3N-WP membranes.

Fig.6 (a) The water contact angle of RWPM membrane in air. (b) The underwater oil contact angle measurement of RWPM. (c) The anti-stick properties of RWPM were tested. (d) Low adhesion of RWPM surface to oil. (e) The self-cleaning performance of RWPM membrane.

Fig.7 (a) Illustration of wood fragments of various thicknesses. (b) Testing pure water flux with wood film. (c) Testing of membrane performance on oil-water mixtures with different number of cycles. (d) Efficiency and permeance of membrane for emulsified oil under different cycles. (e) Process of separating an oil-water mixture. (f) Process of separating emulsified oil.

Fig.8 (a–b) Comparison Diagram of Methylene Blue (MB) and Methyl Orange (MO) before and after separation. (c) Flux and efficiency test of RWPM on various types (Sunflower oil, Diesel oil, Lubricating oil, Petroleum ether and cyclohexane) of oily wastewater. (d–e) Absorbance diagram of MB and MO separation by RWPM Membrane at different wavelengths. (f) Efficiency and flux of RWPM membrane for engine oil under different cycle times. (g) Illustration of the oil-water mixture separation process. (h) Flux recovery rate (F_rr), reversible fouling ratio (R_r), and irreversible fouling ratio (R_ir) of 3N-WP and RWPM.

Fig.9 (a) Optical microscope picture of emulsified oil; (b) Image of emulsified oil separation by RWPM membrane. (c) Optical microscope image of oil-in-water emulsion after being filtered with the RWPM membrane. (d) Illustration of emulsified oil separation. (e) Pure water flux of RWPM membrane under various number of cycles. (f) Separation efficiency and filtration flux of RWPM membrane on emulsified oil under various cycle times. (g) Comparison of flux and separation efficiency of wood chips and RWPM. (h) Oil-in-water emulsion droplet size distribution of feed. (i) Emulsified oil droplet size distribution of filtrate after filtering with the RWPM membrane.

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