Srihanam Prasong, Prapasri Amamita, Janthar Marisa, Leangtanom Pimpan, Thongsomboon Wiriya
Department of Chemistry, Faculty of Science, Mahasarakham University, Kantarawichai, Maha Sarakham 44150, Thailand; Biodegradable Polymers Research Unit, Mahasarakham University, Maha Sarakham, 44150, Thailand.
Department of Chemistry, Faculty of Science, Mahasarakham University, Kantarawichai, Maha Sarakham 44150, Thailand.
Int J Biol Macromol. 2024 Sep 23;280(Pt 3):135910. doi: 10.1016/j.ijbiomac.2024.135910.
Removing toxic dyes from industrial wastewater is crucial for environmental protection. This research introduced novel composite films of manganese oxide (MnO)-modified nanocellulose (MCel) and unmodified nanocellulose (Cel) derived from sugarcane bagasse for dye removal. Nanocellulose was extracted from sugarcane bagasse and subsequently transformed into MCel through in-situ MnO synthesis. The MCel/Cel composites, with various MCel to Cel ratios, were fabricated into films and evaluated for their efficiency in removing methylene blue (MB). The films were characterized using Fourier transform infrared spectroscopy for functional group analysis, X-ray diffraction for crystallinity, X-ray photoelectron spectroscopy for chemical state analysis, field emission scanning electron microscopy-energy dispersive spectroscopy for morphology and elemental composition, and Thermogravimetric Analysis for thermal behaviors. Adsorption results showed that all MCel/Cel composite films achieved over 97 % removal of MB (initial concentration 100 mg L) within 24 h, with convenient adsorbent retrieval after adsorption. The adsorption process followed a pseudo-second order kinetic model and Langmuir adsorption isotherm. The optimal 95:5 MCel/Cel film exhibited a rate constant of 6.16 × 10 g mg min and the calculated adsorption capacity of 181.85 mg g. These results demonstrate significant potential for wastewater treatment and sustainable waste valorization by converting sugarcane bagasse cellulose into environmentally friendly adsorbents for contaminant removal.
从工业废水中去除有毒染料对于环境保护至关重要。本研究引入了由甘蔗渣衍生的氧化锰（MnO）改性纳米纤维素（MCel）和未改性纳米纤维素（Cel）的新型复合膜用于染料去除。纳米纤维素从甘蔗渣中提取，随后通过原位MnO合成转化为MCel。将具有不同MCel与Cel比例的MCel/Cel复合材料制成薄膜，并评估其去除亚甲基蓝（MB）的效率。使用傅里叶变换红外光谱对薄膜进行官能团分析表征，用X射线衍射分析结晶度，用X射线光电子能谱分析化学状态，用场发射扫描电子显微镜 - 能量色散光谱分析形态和元素组成，并用热重分析研究热行为。吸附结果表明，所有MCel/Cel复合膜在24小时内对MB（初始浓度100 mg/L）的去除率均超过97%，吸附后吸附剂便于回收。吸附过程遵循准二级动力学模型和朗缪尔吸附等温线。最佳的95:5 MCel/Cel膜表现出的速率常数为6.16×10 g mg min，计算出的吸附容量为181.85 mg/g。这些结果表明，通过将甘蔗渣纤维素转化为用于去除污染物的环保吸附剂，在废水处理和可持续废物增值方面具有巨大潜力。
