The Applicability of Cellulose — Tara Gum Composite Hydrogels as Dye Capture Adsorbents
The Applicability of Cellulose — Tara Gum Composite Hydrogels as Dye Capture Adsorbents
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DOI：
10.1007/s11270-022-05818-z
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
Diego Gomez-Maldonado;S. Ponce;M. Peresin
中科院分区：
文献类型：
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作者：
Diego Gomez-Maldonado;S. Ponce;M. Peresin
人们越来越关注使用天然材料来生产吸附材料，这些材料可以通过去除工业衍生的污染物（例如染料）来改善水质。在这项工作中，通过将木质纤维素纳米纤维（CNF）和塔拉胶（TG）共溶解在尿素/氢氧化钠碱性介质中，然后在酸性介质中共再生，制备了复合珠。通过傅里叶变换红外衰减全反射（FTIR-ATR）、X射线衍射（XRD）、热重分析（TGA）、元素分析（EA）和扫描电子显微镜（SEM）对所得珠粒进行表征，同时通过紫外-可见光谱跟踪染料吸附能力。结果表明，用 TG 替代 40% 的 CNF 可获得固体含量减少 54% 且保持相似尺寸的轻质珠粒。这些珠子在不同的吸附剂和污染物浓度下进行了亚甲基蓝 (MB) 吸附测试。选择亚甲基蓝是因为它是一种常用的染料，用作组织染色、乳品检测、微生物学以及纺织和皮革工业的氧化还原指示剂。总体而言，TG-CNF 复合珠在染料吸附方面表现出改进的性能，与纯纤维素珠相比，捕获量增加了 39.6%。利用符合 Langmuir 模型的吸附等温线 (2–15 ppm)，计算出最大吸附容量为 13.7 mg/g。
There is a growing interest in using naturally derived materials to generate adsorbent materials that can improve water quality by removing industrially derived pollutants such as dyes. In this work, composite beads were prepared from wood-based cellulose nanofibrils (CNF) and Tara gum (TG) by their co-dissolution in urea/sodium hydroxide alkaline media followed by co-regeneration in acidic media. The obtained beads were characterized by Fourier transformed infrared with attenuated total reflectance (FTIR-ATR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), elemental analysis (EA), and scanning electron microscopy (SEM), while the dye adsorption capacity was followed by UV–Vis spectroscopy. The results showed that a 40% substitution of the CNF with TG resulted in lightweight beads with 54% less solid content that maintained similar dimensions. These beads were tested for methylene blue (MB) adsorption at varying sorbent and pollutant concentrations. Methylene blue was selected as it is a common dye used as a redox indicator for tissue staining, dairy testing, microbiology, and in the textile and leather industries. Overall, the TG-CNF composite beads showed improved performance on dye adsorption, with 39.6% more capture when compared to the neat cellulose beads. The maximum adsorption capacity was calculated as 13.7 mg/g, utilizing an adsorption isotherm (2–15 ppm) fitted into the Langmuir model.