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High-Value Valorization of Agricultural Waste Biomass into Lignin-Based Magnetic Nanocomposites: Multifunctional
Chenxi Li1,2, Qian Ren1,2, Jiayi Song1,3
1State Key Laboratory of Bio-Based Fiber Materials, Tianjin Key Laboratory of Pulp and Paper, China Light Industry Key Laboratory of Papermaking and Biorefinery, China Textile Industry Key Laboratory of High-Performance Fibers Wet-Laid Nonwoven Materials, Tianjin University of Science and Technology, No. 29, 13th Street, TEDA, Tianjin 300457, P. R. China.
Abstract:
The development of green, efficient, and sustainable noble metal nanocatalysts is critical for addressing industrial wastewater pollution. Herein, we report a high-value utilization strategy for agricultural waste biomass by transforming lignin nanoparticles (LNPs) derived from agricultural residues into multifunctional supports for Fe3O4 and Pd nanoparticles. Through a two-step process─antisolvent self-assembly followed by in situ reduction─LNPs@Fe3O4@Pd magnetic nanocomposites are synthesized, combining lignin's inherent eco-friendly properties with the magnetic recyclability of Fe3O4 and the catalytic activity of Pd. The catalytic study showed that LNPs@Fe3O4@Pd presented excellent catalytic efficiency for the fade of methylene blue (catalytic rate constant is 5.89 min-1). The incorporation of stable superparamagnetism imparted the LNPs@Fe3O4@Pd with an exceptional cycling performance. Additionally, the nanocomposites exhibit robust photothermal conversion capabilities, enabling the construction of NIR laser-responsive liquid marbles via simple assembly. These liquid marbles combine magnetic separability and light-triggered controllability, offering a dynamic and reusable platform for dye wastewater treatment. Consequently, LNPs@Fe3O4@Pd and their liquid marble assemblies hold significant potential for industrial-scale applications in sustainable dye removal and beyond.
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