Hongbo Gu1, Xiaomin Zhou2, Shangyun Lyu2, Duo Pan3, Mengyao Dong4, Shide Wu5, Tao Ding6, Xin Wei7, Ilwoo Seok8, Suying Wei7, Zhanhu Guo9. 1. Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China. Electronic address: hongbogu2014@tongji.edu.cn. 2. Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China. 3. College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China. 4. Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou, China; Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37966, USA. 5. Henan Provincial Key Laboratory of Surface and Interface Science, Zhengzhou University of Light Industry, No. 136, Science Avenue, Zhengzhou 450001, China; Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37966, USA. 6. College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China. 7. Department of Chemistry & Biochemistry, Lamar University, Beaumont, TX 77710, USA. 8. Mechanical Engineering, Arkansas State University, Jonesboro, AR 72401, USA. 9. Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37966, USA.
Abstract
HYPOTHESIS: Cellulose aerogels are a new category of high-efficiency adsorbents for treating oil spills and water pollution. However, the hydrophilic properties and recyclability of aerogels after adsorption hamper developments and applications. Combining both hydrophobic and magnetic properties are expected to improve their adsorption capacity and functionality. EXPERIMENTS: In this study, the effect of oleic acid (OA) and nanomagnetite on the preparation of magnetic nanocellulose aerogels (called as NCA/OA/Fe3O4) by a mechanical mixing combined with freeze-drying method have been investigated. FINDINGS: It has been found that the optimal condition for fabricating this NCA/OA/Fe3O4 aerogel is 0.4 wt% nanocellulose, 3 mg mL-1 OA and 0.5 wt% Fe3O4 in the aqueous solution. This aerogel has a very low density of 9.2 mg cm-3 and demonstrates a high adsorption capacity of 68.06 g g-1 for cyclohexane. In addition, this aerogel adsorbent demonstrates an excellent magnetic responsivity and can be easily recycled by a permanent magnet after adsorption. As a consequence, this hydrophobic magnetic NCA/OA/Fe3O4 aerogel is promising not only for easy oil and organic solvent adsorption but also potentially for other magnetic related applications.
HYPOTHESIS: Cellulose aerogels are a new category of high-efficiency adsorbents for treating oil spills and water pollution. However, the hydrophilic properties and recyclability of aerogels after adsorption hamper developments and applications. Combining both hydrophobic and magnetic properties are expected to improve their adsorption capacity and functionality. EXPERIMENTS: In this study, the effect of oleic acid (OA) and nanomagnetite on the preparation of magnetic nanocellulose aerogels (called as NCA/OA/Fe3O4) by a mechanical mixing combined with freeze-drying method have been investigated. FINDINGS: It has been found that the optimal condition for fabricating this NCA/OA/Fe3O4 aerogel is 0.4 wt% nanocellulose, 3 mg mL-1 OA and 0.5 wt% Fe3O4 in the aqueous solution. This aerogel has a very low density of 9.2 mg cm-3 and demonstrates a high adsorption capacity of 68.06 g g-1 for cyclohexane. In addition, this aerogel adsorbent demonstrates an excellent magnetic responsivity and can be easily recycled by a permanent magnet after adsorption. As a consequence, this hydrophobic magnetic NCA/OA/Fe3O4 aerogel is promising not only for easy oil and organic solvent adsorption but also potentially for other magnetic related applications.
Authors: Aleksandra Janićijević; Vera P Pavlović; Danijela Kovačević; Marko Perić; Branislav Vlahović; Vladimir B Pavlović; Suzana Filipović Journal: Polymers (Basel) Date: 2022-04-29 Impact factor: 4.967
Authors: Mohd Nor Faiz Norrrahim; Noor Azilah Mohd Kasim; Victor Feizal Knight; Muhammad Syukri Mohamad Misenan; Nurjahirah Janudin; Noor Aisyah Ahmad Shah; Norherdawati Kasim; Wan Yusmawati Wan Yusoff; Siti Aminah Mohd Noor; Siti Hasnawati Jamal; Keat Khim Ong; Wan Md Zin Wan Yunus Journal: RSC Adv Date: 2021-02-12 Impact factor: 3.361