Oxidation of Reactive Orange 16 by Copper Oxide System
A commercial activated carbon (KI7080) sample was treated by HN03 and followed by heat treatment at 500 and 700°C under a flow of N2. Three types of copper oxide supported-activated carbon catalysts were prepared using impregnation techniques. 5 wt % of Cu was loaded for each catalyst and calcine...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2006
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/6309/1/FS_2006_41.pdf |
| Summary: | A commercial activated carbon (KI7080) sample was treated by HN03 and followed
by heat treatment at 500 and 700°C under a flow of N2. Three types of copper oxide
supported-activated carbon catalysts were prepared using impregnation techniques. 5
wt % of Cu was loaded for each catalyst and calcined at 500QC. Samples were
characterized by FTIR, XRD and nitrogen adsorption isotherm studies. The
adsorption-desorption isotherms of all samples showed a iypical Type I with hysteresis
loops of H',.
The decolourisation of reactive orange 16 (R016) by different advanced oxidation
processes was investigated. The rate of colour removal was studied by measuring the
absorbance at characteristic wavelengths. The effect of CuO dose, H202 dose, W
light, added AC and catalyst was studied. These parameters influenced the
dewlourisation rate. The comparison between powdered and granular CuO was also
studied. It was found that the dewlourisation rate increased until an optimum Hf12
dosage (60 ml of 1 M Hz02), beyond which the reagent exerted an inhibitory effect For CuO/H202 system, contribution of the leached cu2+ to ffie total colour removal by
CuO/H202 can be estimated approximately 40 %. Tbe colour removal by CuOl&02
system is an adsorption/oxidation process. The effect of W on the decolourisation of
R016 was in the following order: C\10/UVIH2O2 > Cu0/H2O2 > CuO/UV = CuO >
UV&Q > H202 > UV.
A simple kinetic model confirmed a pseudo-second order reaction for CuO,
CuOM202, CuO/UV/H202, CuOIUV, UVJH202, Hz@, ACICuO/H2@, S%Cu-ACX,
5%Cu-ACN/UV/H202, 5%Cu-ACN/H202 and 5%Cu-ACN/UV systems.
The AC/CuO/H202 system exhibited a lower efficiency compared to CuO/H2@ most
probably due to decomposition of H202 and reduction of cu2+. The decolourisation
efficiency of 5% Cu-ACN catalyst under four different conditions was observed in the
following order: S%CU-ACW/UV/H~Q> S%CU-ACN/H~@> S%Cu-ACNNV =
5%Cu-ACN. 5%Cu-ACN/UV/H202 system was found to be the most efficient method
on decoloun'sation of ROI 6 in this study. |
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