磁性疏水性纤维素纳米纤丝气凝胶的制备及性能研究

Preparation and Performance Research of Magnetic Hydrophobic Cellulose Nanofibril Aerogel

中文关键词:  纤维素纳米纤丝  十六烷基三甲氧基硅烷  Fe₃O₄纳米粒子  气凝胶

Key Words:cellulose nanofibril  hexadecyltrimethoxysilane  Fe₃O₄ nanoparticles  aerogel

中文摘要:

      以TEMPO氧化法制备的纤维素纳米纤丝（CNF）为原料制备CNF气凝胶，随后采用Fe₃O₄纳米粒子和十六烷基三甲氧基硅烷（HDTMS）对其进行改性制得磁性疏水性CNF气凝胶，并对其疏水性能、磁性、吸附性及其他各项性能进行表征。结果表明，交联剂N，N-亚甲基双丙烯酰胺（MBA）可提高CNF之间的结合强度，使气凝胶结构更加稳定、不易被破坏。制备得到的气凝胶密度和孔隙率分别为0.015 g/cm³和99.02%，其水接触角可达133°，表现出优异的超疏水性，吸附倍率最高可达145 g/g（机油）；同时，添加Fe₃O₄纳米粒子使气凝胶具备较好的磁响应性能，有利于气凝胶的后期回收。

Abstract:

      In this study， cellulose nanofibril （CNF） aerogel was prepared using TEMPO-oxidized CNF as raw material， and then modified by hexadecyltrimethoxysilane （HDTMS） and Fe₃O₄ nanoparticles to obtain magnetic hydrophobic CNF aerogel， the hydrophobicity， magnetism， adsorption， and other properties of which were characterized. The results indicated that the crosslinking agent N，N-methylenebisacrylamide （MBA） had a significant effect on the structure of the aerogel， which could increase the bonding strength between the filaments， rendering a more stable， unbreakable aerogel structure. The density and porosity of the prepared aerogel material reached 0.015 g/cm³ and 99.02%， respectively， and the water contact angle of the aerogel could reach 133°， showing excellent superhydrophobicity， and its adsorption capacity could reach 145 g/g （to motor oil）. Moreover， the addition of Fe₃O₄ nanoparticles endowed the aerogel with better magnetic response performance， which is beneficial to its recovery.