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<p>Methylene blue (MB) and tetracycline (TC) pose significant environmental risks due to their contamination of aquatic ecosystems. This study employed KOH-modified sugarcane bagasse-based porous carbon (KBPC) to remove MB and TC from water. Kinetic and isothermal model analyses, along with various characterization techniques (scanning electron microscopy, BET-N<sub>2</sub>, FTIR, XRD, etc.), were employed to investigate the adsorption behavior and mechanisms. The results indicate that KBPC obtained at a KOH-to-biomass ratio of 3:1, under a nitrogen atmosphere at 700&#xa0;°C for two hours, exhibited the best removal efficiency for TC and MB. The specific surface area of the modified material was 1400.8 m<sup>2</sup>/g, which is 3.8 times that of the unmodified biochar. Within one hour, the experimental maximum equilibrium adsorption capacities for methylene blue (MB) and tetracycline (TC) reached 248.56&#xa0;mg/g and 159.17&#xa0;mg/g, respectively. Furthermore, KBPC demonstrated strong removal capabilities for TC and MB across a wide pH range (3–11). The adsorption behavior also conformed to the pseudo-second-order kinetic model and Langmuir isothermal model, indicating that monolayer chemical adsorption is the primary mechanism. Additionally, regeneration of the material with ethanol maintained a removal efficiency of over 80% after five cycles, highlighting its potential application in practical wastewater treatment. The work can provide a theoretical basis and technical support for the high-value utilization of agricultural waste and the development of novel environmental functional materials.</p>

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Preparation of Sugarcane Bagasse Porous Carbon and its Adsorption Performance on Organic Pollutants in Water

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • Shijie Zhang,
  • Sunyue Jia,
  • Shengrui Wang,
  • Bingshan Jiang,
  • Jianan Zhang,
  • Jinwei Zhang,
  • Qin Zhou

摘要

Methylene blue (MB) and tetracycline (TC) pose significant environmental risks due to their contamination of aquatic ecosystems. This study employed KOH-modified sugarcane bagasse-based porous carbon (KBPC) to remove MB and TC from water. Kinetic and isothermal model analyses, along with various characterization techniques (scanning electron microscopy, BET-N2, FTIR, XRD, etc.), were employed to investigate the adsorption behavior and mechanisms. The results indicate that KBPC obtained at a KOH-to-biomass ratio of 3:1, under a nitrogen atmosphere at 700 °C for two hours, exhibited the best removal efficiency for TC and MB. The specific surface area of the modified material was 1400.8 m2/g, which is 3.8 times that of the unmodified biochar. Within one hour, the experimental maximum equilibrium adsorption capacities for methylene blue (MB) and tetracycline (TC) reached 248.56 mg/g and 159.17 mg/g, respectively. Furthermore, KBPC demonstrated strong removal capabilities for TC and MB across a wide pH range (3–11). The adsorption behavior also conformed to the pseudo-second-order kinetic model and Langmuir isothermal model, indicating that monolayer chemical adsorption is the primary mechanism. Additionally, regeneration of the material with ethanol maintained a removal efficiency of over 80% after five cycles, highlighting its potential application in practical wastewater treatment. The work can provide a theoretical basis and technical support for the high-value utilization of agricultural waste and the development of novel environmental functional materials.