- Thesis topic: To Modify Zinc Hydroxystannate (ZnSn[OH]6) by Silver to Enhance Photocatalytic Activity in Gas Treatment under Solar Light Irradiation

- Doi: 10.6840/cycu202100092

- Abstract: 

         In 2020, human is facing a series of problem of climate change, the main source of this was known as greenhouse gas, and nitrogen gas is one kind of greenhouse gas. A silver nitrate load on zinc hydroxystannate cubic composite, Ag@ZHS was synthesized to treat the nitrogen gas and toluene gas by photocatalysis method under solar light irradiation. The material was synthesized by the hydrothermal method at low temperature and used F127 as surfactants to immobilize silver on the ZHS surface to get high efficiency in the treatment of nitrogen gas. The ratio of silver load on ZHS varied by 1%, 5%, 10%, 20%, and 30%. Characterizations using TEM, SEM, FTIR, XRD, XPS, PL, DRS, and ESR was for material property analysis and to explain the efficiency of treatment gas. Efficiency of1%, 5%, 10%, 20% and 30% is 52%, 52.4%, 58%, 63%, 86% and 71%. When ZHS was loaded by AgNO3 with 20%, it was increasing the performance if it compared with only ZHS, degrade the pollutant up to 85% with nitrogen gas, and get 69% with toluene gas after 30 minutes. By trapping test, combining ZHS with AgNO3 help the material less effect by OH∙ or O∙. To TEM and SEM figures, ZHS material has a cube shape, the size is around 400 nanometer, and the size is relatively uniform. Observing the XRD spectrum, it can be seen that ZHS as well as Ag@ZHS have high crystallinity and shelled cubes due to their high and narrow diffraction, a silver peak shows that the silver already loads on the ZHS surface. With the XPS, it demonstrates that the surface of ZHS has silver, and elemental states are Sn3d5, O1s, Zn2p3, and Ag+ group when adding the AgNO3 as Ag3d5/2 and Ag3d3/2.

Keywords: cubic structure, photocatalysis, silver nitrate, removal, zinc hydroxystannate, nitrogen gas