Fabrication of chitosan/alginate porous sponges as adsorbents for the removal of acid dyes from aqueous solution
- 24 Downloads
Effective wastewater remediation requires the development of suitable adsorbents. In this study, a strategy based on electrostatic interactions between the amino groups of chitosan and the anionic groups of acid dyes was developed for the removal of acid dyes from aqueous solution. By adjusting the fabrication parameters, chitosan/alginate porous sponges with controlled specific areas and pore structures were obtained. To enlarge the adsorption area, the adsorbents were processed via a freezing and lyophilization method to form three-dimensional porous sponges. Acid dyes in aqueous solution were adsorbed by the porous sponges, mainly through an electrostatic interaction mechanism. When the molar ratio of chitosan to alginate was fixed at 1.5:1, the porous sponges showed a maximum adsorption removal capacity of 1468.9 ± 16.3 mg g−1 for acid red B14 at a dye concentration of 150 mg L−1 and pH of 2. The adsorption capacity of this system was significantly enhanced compared with those of control groups such as chitosan powder. Thus, chitosan porous scaffolds provide a novel method for improving the removal capacities of chitosan-based materials for cleanup of acid–dye-contaminated water.
The work was supported by the National Natural Science Foundation of China (Grant nos. 81701844, 51773057 and 81701837), the Natural Science Foundation of Fujian Province (2017J05029) and Department of Education of Fujian Province (JAT160343), the National Experimental Teaching Demonstration Center of Chemical Engineering and Materials (2016 ), IUC Program of Hunan Provincial Education Department (No. 15CY004) and the Open-end Funds of Fujian Engineering, and Research Center of Rural Sewage Treatment and Water Safety (EBL2018006). We would also like to thank Editage [www.editage.cn] for English language editing.
- 1.Ratnamala G, Brajesh K (2013) Biosorption of remazol navy blue dye from an aqueous solution using pseudomonas putida. Int J Environ Sci Te 2(1):80–89Google Scholar
- 12.Li CG, Wang F, Peng WG, He YH (2013) Preparation of chitosan and epichlorohydrin cross-linked adsorbents and adsorption property of dyes. Appl Mech Mater 423:584–587Google Scholar
- 19.Martin RV, Brenda VR, Rodrigo RZ, Daniel ASK, Luis FQO (2015) Chitosan and its potential use as a scaffold for tissue engineering in regenerative medicine. Biomed Res Int 2015:821279Google Scholar
- 30.Sneha K (2017) Self-functionalized, oppositely charged chitosan-alginate scaffolds for biomedical applications. Biotechnol Ind J 13(2):1–15Google Scholar
- 33.Zeng S, Cui ZX, Yang ZQ et al (2016) Characterization of highly interconnected porous poly(lactic acid) and chitosan-coated poly(lactic acid) scaffold fabricated by vacuum-assisted resin transfer molding and particle leaching. J Mater Sci 51:9958–9970. https://doi.org/10.1007/s10853-016-0203-2 CrossRefGoogle Scholar