Tree-like cellulose nanofiber membranes modified by citric acid for heavy metal ion (Cu2+) removal
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Eco-friendly tree-like porous carboxyl modified cellulose nanofiber membranes as highly efficient adsorbents for heavy metal ions were fabricated by the electrospinning of cellulose acetate (CA)/tetrabutylammonium chloride (TBAC)/manganese dioxide (MnO2) solution, and subsequent deacetylation treatment to turn CA into cellulose and citric acid modification to graft carboxyl group on the surface of cellulose nanofibers. The addition of TBAC led to the formation of tree-like structure and MnO2 particles were used as pore-forming agents. The effects of pH, initial ion concentrations and contact time on the removal capacity of heavy metal ions were investigated. During the removal process, the abundant carboxyl groups (–COOH) transferred to carboxylate ions (–COO−) which had stronger ion exchange ability to the metal ion adsorption. In addition, the tree-like porous structure supplied large specific surface area and effectively increased the removal capacity. The removal process could reach a plateau in 90 min with the maximum removal amount of 399.14 mg/g. The removal process was also depicted by Langmuir and Freundlich isotherm model. Generally, the tree-like porous structure will have extensive prospects in the fields of filtration, electrochemistry, tissue engineering and so on.
KeywordsCellulose Tree-like nanofiber Electrospinning Porous Removal Carboxyl modification
The author would like to thank the National Natural Science Foundation of China (51673148), the China Postdoctoral Science Foundation Grant (2018M630276), the Science and Technology Plans of Tianjin (17JCZDJC38100, 16JCTPJC45600, 16PTSYJC00110) for their financial supports.
- Bo Z, Fan T, Di Z (2008) Adsorption of copper ions from aqueous solution by citric acid modified soybean straw. J Hazard Mater 153(1–2):300–308Google Scholar
- Chen S, Wei S, Yu F, Hu W, Wang H (2010) Preparation of amidoximated bacterial cellulose and its adsorption mechanism for Cu2+ and Pb2+. J Appl Polym Sci 117(1):8–15Google Scholar
- Ferrari E, Ranucci E, Edlund U, Albertsson A (2015) Design of renewable poly(amidoamine)/hemicellulose hydrogels for heavy metal adsorption. J Appl Polym Sci 132(12):41695Google Scholar
- Gen Z, Guo Y (2015) Determination of cadmium in wastewater by potassium iodide-rhodamine spectrophotometry. Coal Chem Ind 38(10):103–105 (Chinese) Google Scholar
- Huang H, Shen Y, Yu J, Guo H, Yang F, Gu J et al (2018a) A spherical zwitterionic cellulose acetate/graphene oxide composite adsorbent for efficient removal of Cu2+ and Cd2+ from aqueous solution. BioResources 13(2):3642–3658Google Scholar
- Li M, Wang LJ, Li D, Cheng YL, Adhikari B (2014) Preparation and characterization of cellulose nanofibers from de-pectinated sugar beet pulp. Int J Food Eng 102(3):136–143Google Scholar
- Zang C, Zhang D, Xiong J, Lin H, Chen Y (2014) Preparation of a novel adsorbent and heavy metal ion adsorption. J Eng Fibers 9(4):165–170Google Scholar
- Zhao SY (2014) Study on thiolated modification and properties of porous cellulose acetate nanofibers. Dissertation, Tianjin Polytechnic UniversityGoogle Scholar