Study on photocatalytic oxidation for determination of chemical oxygen demand using a nano-TiO2–K2Cr2O7 system

Autor:	Litong Jin, Zhensheng Pan, Shiyun Ai, Ya Yang, Mengnan Gao, Jiaqing Li
Rok vydání:	2004
Předmět:	Chemical oxygen demand Inorganic chemistry Substrate (chemistry) chemistry.chemical_element Biochemistry Analytical Chemistry Absorbance chemistry.chemical_compound Chromium chemistry Wastewater Photocatalysis Environmental Chemistry Potassium dichromate Spectroscopy Stoichiometry
Zdroj:	Analytica Chimica Acta. 509:237-241
ISSN:	0003-2670
DOI:	10.1016/j.aca.2003.09.056
Popis:	A photocatalytic method for the determination of chemical oxygen demand (COD) using a nano-TiO 2 –K 2 Cr 2 O 7 system is described. The measuring principle is based on direct determination of the change of Cr(III) concentration resulting from photocatalytic oxidation of organic compounds and simultaneous photocatalytic reduction of stoichiometrically involved K 2 Cr 2 O 7 in the solution. The operation conditions were optimized. The determinative COD value using this method was calculated from the absorbance of Cr(III). The operational characteristics of this method were demonstrated by use of a standard glucose solution as substrate. This method was also applied to the determination of the COD of wastewater samples. The results were in good agreement with those from the conventional (i.e., dichromate) COD methods.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0a9a2550c19d5a78a937984e8c944083 https://doi.org/10.1016/j.aca.2003.09.056 Zobrazit plný text záznamu Full Text from ScienceDirect