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Title: Degradation of ferrohexacyanide by advanced oxidation processes
Authors: Malhotra, Sarla
Pandit, M
Tyagi, D K
Keywords: Degradation
hydrogen peroxide
Issue Date: Jan-2005
Publisher: CSIR
Series/Report no.: C07B 33/00
Abstract: Degradation of ferrohexacyanide in aqueous solution by advanced oxidation processes was studied. Advanced oxidation processes included ozone and its combination with H<sub>2</sub>O<sub>2</sub> and ultraviolet radiation (UV). Results demonstrated that UV alone was not sufficient to degrade cyanide ion but an oxidant was required for complete degradation. Degradation of 100 mg/L cyanide in aqueous solution was pseudo-first order reaction at pH 11.0. Lower pH was avoided due to formation of HCN gas but higher pH favoured the degradation. A comparison of three systems <i style="">i.e</i>. O<sub>3</sub>, O<sub>3</sub>/H<sub>2</sub>O<sub>2</sub> and UV/O<sub>3</sub>/H<sub>2</sub>O<sub>2</sub> showed that UV/O<sub>3</sub>/H<sub>2</sub>O<sub>2</sub> was the best system. The experimental results showed that the optimum conditions for UV/O<sub>3</sub>/H<sub>2</sub>O<sub>2</sub> process for total cyanide degradation were obtained at l = 365 nm (400 W medium pressure UV lamp), ozone concentration = 35 mg/L and H<sub>2</sub>O<sub>2</sub> = 88.2 mM.
Description: 19-24
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.12(1) [January 2005]

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