Jedynak Katarzyna, Charmas Barbara
Institute of Chemistry, Faculty of Exact and Natural Sciences, Jan Kochanowski University, Uniwersytecka Str. 7, 25-406 Kielce, Poland.
Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Sklodowska University, Maria Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland.
Materials (Basel). 2025 Jul 20;18(14):3395. doi: 10.3390/ma18143395.
This paper presents the assessment of the possibility of ammonia adsorption on biochars from banana peels, chemically activated with potassium hydroxide (KOH) at different temperatures. The obtained materials were characterized in detail using a number of analytical techniques, including nitrogen adsorption (BET), scanning electron microscopy (SEM), elemental analysis (CHNS), thermal analysis (TG, DTG, DTA), Fourier transform infrared spectroscopy (ATR-FTIR), Raman spectroscopy, Boehm titration method and biochar surface pH. They revealed a largely developed microporous structure and a large specific surface area, ranging from 1134 to 2332 m g. The adsorption tests against ammonia in the gas phase showed a large adsorption capacity of the materials, up to 5.94 mmol g at 0 °C and 3.83 mmol g at 20 °C. The adsorption properties of the obtained biochars were confirmed to be significantly influenced by the surface chemistry (presence of the acidic functional groups). The research results indicate that the waste-based biomass, such as banana peels, can be an ecological and economical raw material for the production of highly effective adsorbents, useful in the removal of ammonia and other toxic gases polluting the environment.
本文介绍了对经不同温度下氢氧化钾（KOH）化学活化的香蕉皮生物炭吸附氨可能性的评估。使用多种分析技术对所得材料进行了详细表征，包括氮吸附（BET）、扫描电子显微镜（SEM）、元素分析（CHNS）、热分析（TG、DTG、DTA）、傅里叶变换红外光谱（ATR-FTIR）、拉曼光谱、 Boehm滴定法和生物炭表面pH值。它们显示出高度发达的微孔结构和较大的比表面积，范围为1134至2332 m²/g。气相中对氨的吸附测试表明材料具有较大的吸附容量，在0°C时高达5.94 mmol/g，在20°C时为3.83 mmol/g。证实所得生物炭的吸附性能受表面化学（酸性官能团的存在）显著影响。研究结果表明，诸如香蕉皮之类的废弃生物质可以成为生产高效吸附剂的生态且经济的原材料，可用于去除氨和其他污染环境的有毒气体。
