Adsorption of Cd2+ and Ni2+ from Aqueous Single-Metal Solutions on Graphene Oxide-Chitosan-Poly(vinyl alcohol) Hydrogels
| Autor: | Yayuan Yan, Yongqiang Xiong, Langhuan Huang, Chunya Li, Shaozao Tan, Jingxian Zhang, Zhenbao Zhang, Quanzhou Zhang |
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| Rok vydání: | 2019 |
| Předmět: |
Vinyl alcohol
Materials science Metal ions in aqueous solution 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention symbols.namesake chemistry.chemical_compound Adsorption law Electrochemistry General Materials Science Spectroscopy Aqueous solution Graphene Langmuir adsorption model Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Chemical engineering chemistry Ionic strength Self-healing hydrogels symbols 0210 nano-technology |
| Zdroj: | Langmuir. 35:4481-4490 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/acs.langmuir.8b04189 |
| Popis: | The applications of graphene-based adsorbents were limited because of their complicated manufacturing technology and hi cost, thus it is very important to prepare new inexpensive and easily manufactured graphene-based adsorbents. Herein, novel GCP hydrogels with different graphene oxide (GO), chitosan (CS), and poly(vinyl alcohol) (PVA) ratios were facilely prepared through a method of freeze-thaw physical cross-linking, which was green and low-cost, and the structural characterization and adsorptive property of the optimum GCP1:2:4 hydrogel toward Cd2+ and Ni2+ in wastewater was evaluated. It was found that the GCP1:2:4 hydrogel had good mechanical strength and a special 3D interconnection porous structure. The isotherms of adsorption used the Langmuir model, and the kinetics of adsorption following the pseudo-second-order model were confirmed. Moreover, the adsorption property with respect to Cd2+ and Ni2+ in wastewater has been largely effected by the pH and was less influenced by the ionic strength and humic acid, and the GCP1:2:4 hydrogel possessed excellent adsorptive and recyclable properties. These results demonstrated that the GCP1:2:4 hydrogel could serve as a desirable adsorbent to get rid of heavy metal ions in sewage. |
| Databáze: | OpenAIRE |
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