Adsorption of Cd2+ by an ion-imprinted thiol-functionalized polymer in competition with heavy metal ions and organic acids
| Autor: | Haizhen Wu, Qiaoping Kong, Yun Hu, Chaohai Wei, Sergei Preis, Binbin Xie |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution General Chemical Engineering Metal ions in aqueous solution Inorganic chemistry 02 engineering and technology General Chemistry Polymer 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Adsorption chemistry X-ray photoelectron spectroscopy Selective adsorption 0210 nano-technology Selectivity 0105 earth and related environmental sciences Coordination geometry |
| Zdroj: | RSC Advances. 8:8950-8960 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c7ra11811b |
| Popis: | The simultaneous presence of heavy metals and organic acids in nature and wastewaters and their competition for adsorption sites determine the migration, transformation and fate of pollutants in the environment. A Cd2+-ion-imprinted polymer (Cd2+-IIP) with a thiol-functional group was hydrothermally synthesized by a surface imprinting technique combined with ultrasonic heating for selective adsorption of Cd2+ from wastewaters. The adsorbent was characterized by SEM, EDS, XPS, BET and FT-IR measurements. The experimental results concerning Cd2+ adsorption from single-, binary-, ternary- and quaternary-metal aqueous solutions containing Cu2+, Ni2+ and Zn2+ revealed high selectivity. In binary-metal solutions, relative selectivity coefficients for Cd2+ in respect to Cd2+/Cu2+, Cd2+/Ni2+, and Cd2+/Zn2+ were as high as 3.74, 5.73 and 4.15, respectively. In multi-metal solutions, competing heavy metal ions had little effect on the adsorption of Cd2+ attributed to the high selectivity of Cd2+-IIP towards Cd2+ determined by its coordination geometry. The effect of low-molecular weight organic acids on the Cd2+ adsorption was also studied and the results showed that the presence of tartaric, citric and oxalic acids as admixtures in Cd2+ aqueous solutions noticeably reduced the cation adsorption in a wide range of concentrations with the minor exception of low contents of citric and tartaric acids slightly improving adsorption. |
| Databáze: | OpenAIRE |
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