Cyanide degradation in aqueous solution by heterogeneous photocatalysis using boron-doped zinc oxide
| Autor: | Jorge Luis Guzmán-Mar, M.L. Maya-Treviño, Laura Hinojosa-Reyes, Raisa Estefanía Núñez-Salas, Aracely Hernández-Ramírez, Minerva Villanueva-Rodríguez |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Aqueous solution Dopant Cyanide chemistry.chemical_element 02 engineering and technology General Chemistry Zinc 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound chemistry Photocatalysis 0210 nano-technology Boron Nuclear chemistry Wurtzite crystal structure |
| Zdroj: | Catalysis Today. 328:202-209 |
| ISSN: | 0920-5861 |
| DOI: | 10.1016/j.cattod.2018.11.061 |
| Popis: | The photocatalytic activity of boron-doped ZnO with varying concentration (1, 1.5 and 2% wt of B) synthesized by sol-gel method was evaluated on cyanide (CN−) degradation in aqueous solution under simulated solar radiation. The obtained catalysts were characterized by XRD, UV–vis/DRS, ICP-OES, FT-IR, and XPS. The photocatalytic experiments were carried out in a quartz batch reactor using 300 mL of cyanide solution adjusted at pH 11, evaluating different parameters such as the amount of B dopant, catalyst loading and initial concentration of cyanide solution. A 23 central composite faced design was used to maximize CN− photocatalytic degradation. The cyanide concentration was measured by ISE potentiometric method and the content of intermediate ions (OCN−, NO3−, and NH4+) was determined by UV–vis spectrophotometry. The boron incorporation into ZnO lattice (ZnO-B) reduced wurtzite crystallite size (25 nm) and narrowed the band gap (3.0 eV) compared to bare ZnO (43 nm and 3.2 eV, respectively). The ZnO-B 1.5 wt% showed better photocatalytic performance by degrading 89% of a 10 mg L-1 CN− solution compared to 75% that was reached by undoped ZnO; using in both cases 1.4 g L-1 of catalyst loading at accumulated energy of 400 kJ m-2. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect