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Preparation of Spherical Lignin-sulfoacid Phenolic Resin and Its Adsorption Performance for Rhodamine B
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DOI：10.11777/j.issn1000-3304.2025.25260.png)
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Abstract
En 中文
Addressing the dual demands of alkaline dye wastewater treatment and high-value utilization of lignin, this study proposes a one-step suspension polymerization method for the preparation of spherical sodium lignosulfonate-phenolic resin-based adsorbents. By optimizing the polymerization process, adjusting the dosage of sodium lignosulfonate, cross-linking agent, and solvent, the regulation of resin sphericity and adsorption capacity under a relatively high lignin dosage was achieved. Sulfonic acid groups were introduced as adsorption sites through in situ polymerization, which effectively eliminated the need for additional modification steps and enabled the retention of a high density (>= 1.24 mmol g(-1)) of sulfonic acid groups with uniform distribution. Adsorption experiments demonstrated that the designed spherical sodium lignosulfonate-phenolic resin-based adsorbents exhibited excellent adsorption capacity for the alkaline dye rhodamine B over a wide pH range, with a maximum adsorption capacity of up to 2156 mg g(-1). This value far exceeded that of the widely used commercial macroporous strong acid resin D072 (1502 mg-g(-1)). The discussion of the results indicated that the adsorption mechanism of rhodamine B was mainly attributed to ion exchange, hydrophobic effect and hydrogen bonding, and the abundant pore structure was conducive to the synergistic effect of various adsorption mechanisms. This research provides an important reference for the development and design of high-performance and practical lignin-based phenolic resin adsorbents in the field of basic dye wastewater treatment, and at the same time contributes to the high-value conversion of lignin, a renewable biomass resource.
Keywords:
Sodium lignosulfonate
Spherical sodium lignosulfonate-phenolic resin
Alkaline dye adsorption
Rhodamine B
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