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• W2012083044 abstract "The photocatalytic decolorization of cobalamin was carried out in aqueous solution of different types of catalysts including ZnO, TiO<sub >2</sub> (Degussa P25), TiO<sub >2</sub> (Hombikat UV100), TiO<sub >2</sub> (Millennium PC105), and TiO<sub >2</sub> (Koronose 2073) by using UVA source of irradiation. The effect of various parameters such as photocatalyst amount, cobalamin concentration, type of catalyst, pH of aqueous solution, light intensity, addition of H<sub >2</sub>O<sub >2</sub>, flow rate of O<sub >2</sub>, type of current gas, and temperature on photocatalytic oxidation was investigated. The results indicated that the photocatalytic decolorization of cobalamin was well described by pseudo-first-order kinetics according to the Langmuir-Hinshelwood model. The effect of temperature on the efficiency of photodecolorization of cobalamin was also studied in the range 278&#x2013;298&#x2009;K. The activation energy was calculated according to Arrhenius plot and was found equal to <svg style=vertical-align:-0.3003pt;width:42.137501px; id=M1 height=11.2875 version=1.1 viewBox=0 0 42.137501 11.2875 width=42.137501 xmlns:xlink=http://www.w3.org/1999/xlink xmlns=http://www.w3.org/2000/svg> <g transform=matrix(.017,0,0,-.017,.062,10.863)><path id=x32 d=M412 140l28 -9q0 -2 -35 -131h-373v23q112 112 161 170q59 70 92 127t33 115q0 63 -31 98t-86 35q-75 0 -137 -93l-22 20l57 81q55 59 135 59q69 0 118.5 -46.5t49.5 -122.5q0 -62 -29.5 -114t-102.5 -130l-141 -149h186q42 0 58.5 10.5t38.5 56.5z/></g><g transform=matrix(.017,0,0,-.017,8.222,10.863)><path id=x38 d=M249 635q70 0 116 -43t46 -105q0 -46 -28 -80q-22 -25 -80 -64q62 -35 97 -75t35 -99q0 -81 -63 -131t-135 -50q-83 0 -137.5 45.5t-54.5 123.5q0 52 45 95q29 28 89 64q-109 62 -109 155q0 66 50.5 115t128.5 49zM238 603q-42 0 -67.5 -31t-25.5 -72q0 -50 32.5 -79.5&#xD;&#xA;t98.5 -62.5q61 48 61 124q0 59 -29.5 90t-69.5 31zM248 20q46 0 76.5 33.5t30.5 89.5q0 50 -39 85.5t-110 71.5q-81 -54 -81 -137q0 -67 35.5 -105t87.5 -38z/></g><g transform=matrix(.017,0,0,-.017,20.155,10.863)><path id=xB1 d=M535 290h-212v-206h-58v206h-213v50h213v193h58v-193h212v-50zM535 -22h-483v50h483v-50z/></g><g transform=matrix(.017,0,0,-.017,33.907,10.863)><path id=x31 d=M384 0h-275v27q67 5 81.5 18.5t14.5 68.5v385q0 38 -7.5 47.5t-40.5 10.5l-48 2v24q85 15 178 52v-521q0 -55 14.5 -68.5t82.5 -18.5v-27z/></g> </svg>&#x2009;kJ&#x000B7;mol<sup >&#x2212;1 </sup>for ZnO and <svg style=vertical-align:-0.3003pt;width:42.137501px; id=M2 height=11.2875 version=1.1 viewBox=0 0 42.137501 11.2875 width=42.137501 xmlns:xlink=http://www.w3.org/1999/xlink xmlns=http://www.w3.org/2000/svg> <g transform=matrix(.017,0,0,-.017,.062,10.863)><use xlink:href=#x32/></g><g transform=matrix(.017,0,0,-.017,8.222,10.863)><use xlink:href=#x32/></g><g transform=matrix(.017,0,0,-.017,20.155,10.863)><use xlink:href=#xB1/></g><g transform=matrix(.017,0,0,-.017,33.907,10.863)><use xlink:href=#x31/></g> </svg>&#x2009;kJ&#x000B7;mol<sup >&#x2212;1</sup> for TiO<sub >2</sub> (Degussa P25). The results of the total organic carbon (TOC) analysis indicate that the rate of decolorization of dye was faster than the total mineralization. Decolorization and mineralization of cobalamin in the absence of light and/or catalyst were performed to demonstrate that the presence of light and catalyst is essential for the decolorization of this cobalamin. The results show that the activity of different types of catalysts used in this study was of the sequence: ZnO &#x3e; TiO<sub >2</sub> (Degussa P25) &#x3e; TiO<sub >2</sub> (Hombikat UV100) &#x3e; TiO<sub >2</sub> (Millennium PC105) &#x3e; TiO<sub >2</sub> (Koronose 2073)." @default.
• W2012083044 created "2016-06-24" @default.
• W2012083044 creator A5033088523 @default.
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• W2012083044 date "2012-01-01" @default.
• W2012083044 modified "2023-09-30" @default.
• W2012083044 title "Rapid Decolorization of Cobalamin" @default.
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• W2012083044 doi "https://doi.org/10.1155/2012/495435" @default.
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