About: Oxidation of azo textile soluble dyes with hydrogen peroxide in the presence of Cu(II)-chitosan heterogeneous catalysts     Goto   Sponge   NotDistinct   Permalink

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Description
  • Cu(II)-chitosan complexes were used as heterogeneous catalysts for degradation of five model azo textile dyes in aqueous solution with hydrogen peroxide. The most efficient catalyst contained 3.6% Cu2+ and the optimal reaction conditions were pH 7.0 and 50 mM of hydrogen peroxide. The rate of decolourisation was found to be directly dependent on the dye and hydrogen peroxide concentrations in the reaction mixture. Azo dyes containing the nitro group in their molecule were easier to oxidise than those lacking this group. Using optimal reaction conditions, 91.5% decolourisation of dye III (0.04 mM) was obtained after about 20 min of reaction. However, 180 min were needed to decolorize about 85% of similar concentration of dye I. The only chemical structural difference is one nitro group on para position in relation to the azo bond.
  • Cu(II)-chitosan complexes were used as heterogeneous catalysts for degradation of five model azo textile dyes in aqueous solution with hydrogen peroxide. The most efficient catalyst contained 3.6% Cu2+ and the optimal reaction conditions were pH 7.0 and 50 mM of hydrogen peroxide. The rate of decolourisation was found to be directly dependent on the dye and hydrogen peroxide concentrations in the reaction mixture. Azo dyes containing the nitro group in their molecule were easier to oxidise than those lacking this group. Using optimal reaction conditions, 91.5% decolourisation of dye III (0.04 mM) was obtained after about 20 min of reaction. However, 180 min were needed to decolorize about 85% of similar concentration of dye I. The only chemical structural difference is one nitro group on para position in relation to the azo bond. (en)
  • Cu(II)-chitosan komplexy byly použity jako heterogenní katalyzátory pro degradaci pěti modelových textilních barviv ve vodném roztoku s peroxidem vodíku. Nejúčinnější katalyzátor obsahoval 3.6% Cu2+ a optimální reakční podmínky byly pH 7.0 a 50 mM peroxid vodíku. Bylo zjištěno, že rychlost odbarvení přímo závisí na koncentracích barviva a peroxidu vodíku v reakční směsi. Azobarviva obsahující ve své molekule nitroskupinu se oxidovala snadněji nežli ta bez nitroskupiny. Za použití optimálních reakčních podmínek bylo 91.5% odbarvení barviva III (0.04 mM) dosaženo po 20 min reakce. Avšak 180 min bylo třeba k tomu aby se z 85% odbarvilo barvivo I o podobné koncentraci. Jediným strukturním rozdílem je jedna nitroskupina v para poloze vzhledem k azo vazbě. (cs)
Title
  • Oxidation of azo textile soluble dyes with hydrogen peroxide in the presence of Cu(II)-chitosan heterogeneous catalysts
  • Oxidation of azo textile soluble dyes with hydrogen peroxide in the presence of Cu(II)-chitosan heterogeneous catalysts (en)
  • Oxidace textilních rozpustných azobarviv peroxidem vodíku v přítomnosti Cu(II)-chitosan heterogenním katalyzátorem (cs)
skos:prefLabel
  • Oxidation of azo textile soluble dyes with hydrogen peroxide in the presence of Cu(II)-chitosan heterogeneous catalysts
  • Oxidation of azo textile soluble dyes with hydrogen peroxide in the presence of Cu(II)-chitosan heterogeneous catalysts (en)
  • Oxidace textilních rozpustných azobarviv peroxidem vodíku v přítomnosti Cu(II)-chitosan heterogenním katalyzátorem (cs)
skos:notation
  • RIV/00216275:25310/07:00006439!RIV08-MSM-25310___
http://linked.open.../vavai/riv/strany
  • 19-24
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • Z(MSM0021627501)
http://linked.open...iv/cisloPeriodika
  • 1
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
http://linked.open.../riv/druhVysledku
http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
http://linked.open...dnocenehoVysledku
  • 440383
http://linked.open...ai/riv/idVysledku
  • RIV/00216275:25310/07:00006439
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • Chitosan; Oxidation; Catalyst; Textile; Dyes (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV
  • [A78D8BD668D6]
http://linked.open...i/riv/nazevZdroje
  • Dyes and Pigments
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 73
http://linked.open...iv/tvurceVysledku
  • Hrdina, Radim
  • Šuláková, Romana
  • Soares, Graca
http://linked.open...n/vavai/riv/zamer
issn
  • 0143-7208
number of pages
http://localhost/t...ganizacniJednotka
  • 25310
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