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|Title:||Degradation of ferrohexacyanide by advanced oxidation processes|
Tyagi, D K
|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.|
|ISSN:||0975-0991 (Online); 0971-457X (Print)|
|Appears in Collections:||IJCT Vol.12(1) [January 2005]|
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