Qiu Wei-Peng, Su Hai-Ze, Hu Teng-Gen, Su Hao, Li Na, Lai Li-Shan, Zhu Jia-le, Zhao Ya-Li, Xu Zhen-Lin, Wang Hong, Wen Peng
College of Food Science, Guangdong Provincial Key Laboratory of Food Quality and Safety, South China Agricultural University, Guangzhou 510642, China.
Sericultural Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences, Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs, Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
J Colloid Interface Sci. 2025 Feb;679(Pt A):358-374. doi: 10.1016/j.jcis.2024.09.202. Epub 2024 Sep 26.
Water pollution and agricultural waste are pressing global issues. Herein, a biomass aerogel derived from waste taro stem microcrystalline cellulose (TS-MCC) was fabricated, in which, the effects of cellulose amount, cross-linker content, pre-freezing protocols on the aerogel's property were studied. The optimized TS-MCC aerogel exhibited a hierarchical porous structure with good mechanical property (65.04 kPa) and adsorption capacities, with the q towards microplastics (Polystyrene, PS) and dye (Congo red, CR) being 418.6 mg/g and 951.51 mg/g at 298 K, respectively. Meanwhile, it exhibited good applicability under different pH (3-11) and ionic strength environments, as well as the retained notably simultaneous adsorption ability even under mixed contaminant systems. The mathematical models suggested that the adsorption of PS and CR both fitted pseudo-second-order kinetics, and the adsorption isotherms could be described by the Langmuir and Freundlich models, respectively. Hydrogen bonding, electrostatic attraction, and π-π interactions were inferred as the main adsorption mechanisms towards PS and CR according to Fourier transform infrared spectrometer and X-ray photoelectron spectroscopy analysis. Moreover, the adsorption efficiencies were 92.37 % for PS and 88.34 % for CR after 5 reuse cycles. Therefore, this study provides a green aerogel sorbent for adsorbing microplastics and dyes contaminants.
水污染和农业废弃物是紧迫的全球性问题。在此，制备了一种由废弃芋头茎微晶纤维素（TS-MCC）衍生的生物质气凝胶，研究了纤维素用量、交联剂含量、预冻方案对气凝胶性能的影响。优化后的TS-MCC气凝胶呈现出具有良好机械性能（65.04 kPa）和吸附能力的分级多孔结构，在298 K下对微塑料（聚苯乙烯，PS）和染料（刚果红，CR）的吸附量分别为418.6 mg/g和951.51 mg/g。同时，它在不同pH（3-11）和离子强度环境下表现出良好的适用性，甚至在混合污染物体系下也能显著保持同时吸附能力。数学模型表明，PS和CR的吸附均符合准二级动力学，吸附等温线分别可用Langmuir模型和Freundlich模型描述。根据傅里叶变换红外光谱仪和X射线光电子能谱分析，推断氢键、静电吸引和π-π相互作用是对PS和CR的主要吸附机制。此外，经过5次重复使用循环后，对PS的吸附效率为92.37%，对CR的吸附效率为88.34%。因此，本研究为吸附微塑料和染料污染物提供了一种绿色气凝胶吸附剂。
