Flexible aerogel composites for the elimination of crystal violet and methyl orange

IF 2.5 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Porous Materials Pub Date : 2024-07-02 DOI:10.1007/s10934-024-01654-0

Phuong X.T. Nguyen, Anh P.N. Pham, Hong T.T. Nguyen, Tai C. Do, Phung K. Le

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Abstract

The application of porous aerogels for dye adsorption has proven to be an effective approach in wastewater treatment. In this study, bio-cellulose aerogels from coconut fibrils were successfully developed via the formation of physically cross-linking cellulose with non-toxic binders (polyvinyl alcohol (PVA) and xanthan gum (XTG)) resulting from a freeze-drying technique. The flexible aerogel composites demonstrated remarkably low density (27.59–47.76 g/cm³), high porosity (> 96.0%), compressive Young’s modulus (3.82–12.66 kPa), a specific surface area of 518.01 m²/g, and a desorption average pore diameter distribution of 3.77 nm. These aerogels were tested for crystal violet (CV) and methyl orange (MO) adsorption to evaluate their effectiveness in treating dye-polluted water via various conditions such as contact time, pH values, initial concentrations, and temperature. The dye adsorption process reached equilibrium after approx. 30 min and strictly followed pseudo-second-order and the Redlich-Peterson model. FT-IR and SEM-EDX analyses proved that the adsorption mechanism is primarily ascribed to the hydrogen bonding, electrostatic, π-π, and Vander Waals interactions between aerogel and dye molecules. The eco-friendly synthesis of recycled cellulose aerogels from coconut fibrils using green chemicals holds great promise for dye elimination.

Graphical Abstract

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用于消除结晶紫和甲基橙的柔性气凝胶复合材料

在废水处理中，应用多孔气凝胶吸附染料已被证明是一种有效的方法。在这项研究中，通过冷冻干燥技术将纤维素与无毒粘合剂（聚乙烯醇（PVA）和黄原胶（XTG））物理交联，成功地从椰子纤维中开发出了生物纤维素气凝胶。柔性气凝胶复合材料具有显著的低密度（27.59-47.76 克/立方厘米）、高孔隙率（96.0%）、压缩杨氏模量（3.82-12.66 千帕）、518.01 平方米/克的比表面积和 3.77 纳米的解吸平均孔径分布。对这些气凝胶进行了水晶紫（CV）和甲基橙（MO）吸附测试，以评估它们在不同条件下（如接触时间、pH 值、初始浓度和温度）处理染料污染水的效果。染料吸附过程在大约 30 分钟后达到平衡，并严格遵循伪二阶和 Redlich-Peterson 模型。傅立叶变换红外光谱（FT-IR）和扫描电子显微镜（SEM-EDX）分析表明，吸附机理主要归因于气凝胶与染料分子之间的氢键、静电、π-π和范德华相互作用。利用绿色化学品从椰子纤维中合成生态友好型再生纤维素气凝胶在消除染料方面前景广阔。

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来源期刊

Journal of Porous Materials 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.70%

发文量

203

审稿时长

2.6 months

期刊介绍： The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials. Porous materials include microporous materials with 50 nm pores. Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.