Solid-Phase Synthesis of Non-metal (S, N)-Doped Tin Oxide Nanopowders at Room Temperature and its Photodegradation Properties for Wastewater of Biomass Treatment.

Autor: Liu, Shao-You, Wang, Qian, Ou, Li-Hui, Du, Hong-Li, Long, You, Zhen, Wei-Jun
Předmět:
Zdroj: Journal of Inorganic & Organometallic Polymers & Materials; Jul2022, Vol. 32 Issue 7, p2748-2762, 15p
Abstrakt: Tin oxide and sulfur, nitrogen-doped tin oxide nano-powder catalysts were prepared by a solid phase reaction at room temperature, using the sodium p-toluene sulfonate (STS) surfactant as template. Theoretical calculation of the dehydration reaction energy of tin hydroxide was performed with the framework of DFT and their structures were characterized. And the UV-light degradation performance and mechanism used for the biomass wastewater were discussed, as well as, its COD and NH3-N value. The results show that the large gap of the reaction energy between intramolecular dehydration (Er = 2.81 eV) and intermolecular dehydration (Er = 5.77 eV) for tin hydroxide causes the presence of amorphous SnO2 and metastable tin hydroxide at 450 °C. The entry of S and N into the (110) crystal plane of SnO2 reduces its energy band gap width, exhibiting the photocatalytic degradation rate (98.9%) of S + N-SnO2-STS sample for the rice straw powder treatment wastewater (RSPTW) irradiated by UV-light for 8 h. The excellent degradation capacity of RSPTW mainly comes from the hydroxyl radicals (·OH) and superoxygen radicals (·O2−) produced by the rich hydroxyl on the surface of S + N-SnO2-STS due to the regulatory effect of STS and lower calcined temperature. The sewage discharge of photodegraded RSPTW complies with Chinese National Level II Standards. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
Externí odkaz: