Adsorption and photocatalytic degradation of methylene blue using potassium polytitanate and solar simulator
| Autor: | Leonard D. Tijing, Mohammad Shahid, Ho Kyong Shon, El Saliby I, Jong-Ho Kim, Andrew M. McDonagh, Laura Chekli |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Potassium Inorganic chemistry Biomedical Engineering chemistry.chemical_element Bioengineering 02 engineering and technology 010402 general chemistry 01 natural sciences Catalysis Water Purification chemistry.chemical_compound Adsorption Solar Energy General Materials Science Nanoscience & Nanotechnology Photodegradation Titanium Aqueous solution General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Methylene Blue chemistry Chemical engineering Photocatalysis Degradation (geology) Nanoparticles Solar simulator 0210 nano-technology Methylene blue Water Pollutants Chemical |
| Popis: | Copyright © 2016 American Scientific Publishers All rights reserved. Solar photocatalytic degradation of organic water pollutants can be used to degrade toxic organic pollutants in water. In this study, potassium titanate nanofibres were synthesized by an aqueous peroxide route at high pH and examined as photocatalysts for photodegradation of methylene blue (MB) using a solar simulator. Initially, MB was adsorbed on the surface of potassium polytitanates to achieve adsorption equilibrium before the photocatalysts were illuminated using solar simulator. The results showed that potassium polytitanate nanofibres were effective adsorbents of MB and also facilitated its photocatalytic degradation. Sulphate ion evolution during photocatalysis confirmed that some mineralisation occurred and hence photo-oxidative degradation of MB took place. The optimum operational conditions for the photocatalytic degradation of MB were found at 0.05 g/L of photocatalyst load, 10 mg/L MB and pH 7. The stability and regeneration of the photocatalyst specimen was also studied for 3 degradation cycles using adsorption/photocatalysis model. Morphological structure analysis of potassium titanate showed nanocrystallines structure of longitudinally-oriented isolated fibre with a length up to several micrometres with diameters ranging from 10 to 20 nanometres. |
| Databáze: | OpenAIRE |
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