Activated carbons with adsorbed cations as photocatalysts for pollutants degradation in aqueous medium
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Oxidized activated carbon (AC) based on commercial coconut-shell carbon Aquacarb 607C has been prepared. This AC has micro-mesoporous structure and contains surface carboxyl and phenol/enol groups. Cu- and Co-containing ACs have been synthesized via ion-exchange in acid medium. According to potentiometric titration and XPS data, cation-exchanged forms of AC contain about 0.5% of metal ions. Such cation-containing ACs possess narrowed band gap compared oxidized AC as it is observed for doped oxides. Oxidized and cation-containing ACs have been tested as catalysts in photodegradation of dyes and phenol under UV- and visible irradiation. Initial oxidized AC is photoactive toward rhodamine B and methyl orange under UV illumination but inactive under visible light. For the first time it is shown that cation-exchanged forms of AC have enhanced activity towards rhodamine B, methyl orange and phenol in both UV and visible region. Therefore, the principal possibility of improving the photocatalytic properties of AC by introducing a minimal amount of copper and cobalt cations is shown.
KeywordsActivated carbon Cation-exchanged forms Photocatalytic degradation UV and visible irradiation Decolourisation and mineralization
Funding was provided by National Academy of Sciences of Ukraine (Grant No. 35NT).
- Moreno-Castilla, C., Alvarez-Merino, M., López-Ramón, M., Rivera-Utrilla, J.: Cadmium ion adsorption on different carbon adsorbents from aqueous solutions. Effect of surface chemistry, pore texture, ionic strength, and dissolved natural organic matter. Langmuir 20, 8142–8148 (2004)CrossRefGoogle Scholar
- Moulder, J., Stickle, W., Sobol, P., Bomben, K.: Handbook of X-ray Photoelectron Spectroscopy, 2nd edn. Perkin-Elmer, Eden Prairie (1992)Google Scholar
- Myglovets, M., Poddubnaya, O., Sevastyanova, O., Lindström, M., Gawdzik, B., Sobiesiak, M., Tsyba, M., Sapsay, V., Klymchuk, D., Puziy, A.: Preparation of carbon adsorbents from lignosulfonate by phosphoric acid activation for the adsorption of metal ions. Carbon 80, 771–783 (2014)CrossRefGoogle Scholar
- Oh, Y., Kim, S., Lee, I., Lee, J., Chang, K.: Direct band gap carbon superlattices with efficient optical transition. Phys. Rev. B 93, 085201-1–085201-8 (2016)Google Scholar
- Rouquerol, J., Llewellyn, P., Rouquerol, F.: Is the BET equation applicable to microporous adsorbents? In: Llewellyn, P.L., Rodriquez-Reinoso, F., Rouqerol, J., Seaton, N. (eds.) COPS-7: Characterization of Porous Solids VII. Studies in Surface Science and Catalysis, vol. 160, pp. 49–56. Elsevier. Amsterdam (2007)Google Scholar
- Tarkovskaya, I.: Oxidized Carbon. Naukova Dumka, Kyiv (1981) (in Russian)Google Scholar
- Velo-Gala, I., López-Peñalver, J., Sánchez-Polo, M., Rivera-Utrilla, J.: Activated carbon as photocatalyst of reactions in aqueous phase. Appl. Catal. B 142–143, 694–704 (2013)Google Scholar
- Xu, M., Jia, S., Chen, C., Zhang, Z., Yan, J., Guo, Y., Zhang, Y., Zhao, W., Yun, J., Wang, Y.: Microwave-assistant hydrothermal synthesis of SnO2@ZnO hierarchical nanostructures enhanced photocatalytic performance under visible light irradiation. Mater. Res. Bull. 106, 74–80 (2018)CrossRefGoogle Scholar