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<p>In this study, a green and efficient ultrasound-assisted alkali-acid synergistic strategy was developed for the high-yield extraction of cellulose from tea residue, combined with a recyclable aminosulfonic acid recovery system to achieve green and low-carbon production. Orthogonal experiments were conducted using a NaOH-H<sub>2</sub>O<sub>2</sub> system (4% NaOH, 2% H<sub>2</sub>O<sub>2</sub>, solid–liquid ratio 1:10, ultrasonication for 50&#xa0;min) optimized the alkali pretreatment, achieving a preliminary extraction yield of 34.07%. This was followed by sulfamic acid hydrolysis under optimized conditions (15% sulfamic acid, solid–liquid ratio 1:15, ultrasonication for 70&#xa0;min), increasing the cellulose yield to 75.46%. Through a multi-step recovery process comprising dilution and sedimentation, flocculation-assisted precipitation, filtration separation, rotary concentration, and crystallization collection, the average recovery rate of aminosulfonic acid reached 94.68%. Characterization by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA) confirmed that the extracted cellulose has an intact molecular structure, high crystallinity, and good thermal stability. This work provides a promising green pathway for the high-value utilization of agricultural industrial waste.</p>

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A green alkali–acid synergistic ultrasound-assisted strategy using recyclable sulfamic acid for efficient cellulose extraction from tea residue

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Keni Li,
  • Yuhua Yang,
  • Jingyan Xu,
  • Wenjun Huang,
  • Hongmei Tang,
  • Jiehui Chen,
  • Wenwen Ma

摘要

In this study, a green and efficient ultrasound-assisted alkali-acid synergistic strategy was developed for the high-yield extraction of cellulose from tea residue, combined with a recyclable aminosulfonic acid recovery system to achieve green and low-carbon production. Orthogonal experiments were conducted using a NaOH-H2O2 system (4% NaOH, 2% H2O2, solid–liquid ratio 1:10, ultrasonication for 50 min) optimized the alkali pretreatment, achieving a preliminary extraction yield of 34.07%. This was followed by sulfamic acid hydrolysis under optimized conditions (15% sulfamic acid, solid–liquid ratio 1:15, ultrasonication for 70 min), increasing the cellulose yield to 75.46%. Through a multi-step recovery process comprising dilution and sedimentation, flocculation-assisted precipitation, filtration separation, rotary concentration, and crystallization collection, the average recovery rate of aminosulfonic acid reached 94.68%. Characterization by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA) confirmed that the extracted cellulose has an intact molecular structure, high crystallinity, and good thermal stability. This work provides a promising green pathway for the high-value utilization of agricultural industrial waste.