吸附
化学工程
材料科学
气凝胶
多孔性
纤维素
纳米材料
朗缪尔吸附模型
水溶液中的金属离子
朗缪尔
化学
金属
纳米技术
复合材料
有机化学
冶金
工程类
作者
Juntao Tang,Yang Song,Feiping Zhao,Stewart Spinney,Juliana S. Bernardes,Kam Chiu Tam
标识
DOI:10.1016/j.carbpol.2018.12.079
摘要
A sustainable nanomaterial, cellulose nanofibril (CNF) was used to prepare aerogel sorbents to remove various contaminants in wastewater. A mussel-inspired coating strategy was used to introduce polydopamine onto the surface of CNFs, which were cross-linked with polyethylenimine (PEI) to form the aerogels. The synthetic procedure was optimized to achieve a minimal consumption of raw materials to produce a robust porous structure. The aerogels possessed a low density (25.0 mg/cm3), high porosity (98.5%) and shape recovery in air and water. Adsorption studies were conducted on two representative contaminants, Cu (II) and methyl orange (MO). The kinetic data obeyed the pseudo 2nd order kinetic model and the mechanism of adsorption could be described by the intra-particle diffusion model. The Langmuir model fitting yielded a maximum adsorption capacity of 103.5 mg/g and 265.9 mg/g for Cu (II) and MO, respectively. The effects of pH on the adsorption performance were evaluated, confirming that the aerogels can maintain a high adsorption capacity over a wide pH range.
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