Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; Key Laboratory for Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; Guangdong Provincial Key Laboratory of Distributed Energy Systems, School of Chemical Engineering and Energy Technology, Dongguan University of Technology, Dongguan 523808, China.
Key Laboratory for Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China.
Int J Biol Macromol. 2021 Jun 30;181:1030-1038. doi: 10.1016/j.ijbiomac.2021.04.078. Epub 2021 Apr 20.
A low-cost, collectable, and efficient material is essential for adsorbing water pollution, such as dyes and heavy metal ions pollution. In this work, we proposed a novel strategy for the preparation of an efficient and collectable magnetic aerogel as adsorbent for dye. The magnetic aerogels were prepared from sodium carboxymethylcellulose (CMC) hydrogel using citric acid (CA) as the crosslinker, followed by vacuum freeze-drying technique to obtain aerogels. The effects of magnetic FeO nanoparticle contents on the adsorption properties of the aerogels were investigated. The results show that the as-prepared magnetic composite aerogels exhibit porous structure and display good adsorption and collectable performance for methylene blue (MB) in water with the removal rate of 97.5% in 6 h. The maximum compress strength and absorption capacity of the magnetic aerogel with 1 wt% FeO nanoparticle loading for MB is 0.13 MPa and 83.6 mg/g, respectively. Aerogels with FeO nanoparticles exhibited magnetism which enables the aerogels to easily collect. This excellent structure stability and collectability guarantees long-term integrity and floatability of the magnetic aerogels in water.
一种低成本、可收集且高效的材料对于吸附水污染（如染料和重金属离子污染）至关重要。在这项工作中，我们提出了一种用于制备高效且可收集的磁性水凝胶吸附剂以吸附染料的新策略。通过使用柠檬酸（CA）作为交联剂，从羧甲基纤维素钠（CMC）水凝胶制备磁性水凝胶，然后通过真空冷冻干燥技术获得水凝胶。研究了磁性 FeO 纳米颗粒含量对水凝胶吸附性能的影响。结果表明，所制备的磁性复合水凝胶具有多孔结构，对水中亚甲基蓝（MB）表现出良好的吸附和可收集性能，在 6 h 内去除率达到 97.5%。对于负载 1 wt% FeO 纳米颗粒的 MB，磁性水凝胶的最大压缩强度和吸附容量分别为 0.13 MPa 和 83.6 mg/g。具有 FeO 纳米颗粒的水凝胶表现出磁性，使其能够轻松收集。这种优异的结构稳定性和可收集性保证了磁性水凝胶在水中的长期完整性和漂浮性。
