3 aminopropyltriethoxysilane catalyst 4 chemical structure 4 infrared spectroscopy 4 Acid Orange II 2 Alizarin 2 Alizarin Red 2 Alizarin Red S 2 Aminopropyltriethoxysilane 2 Armoracia rusticana 2 Aromatic compounds 2 Article 2 Azo dyes 2 Biomimetics 2 Catalyst activity 2 Catalyst supports 2 Catalysts 2 Chitin 2 Chitosan 2 Citrus fruits 2 Heterogeneous catalyst 2 Ketones 2 OH-functionalized organotrialkoxysilanes 2 Peroxidase 2 Poly(silsesquioxanes) 2 Polyhedral oligomeric silsesquioxanes (POSS) 2 Response surface analysis 2 S O C bonds 2 Silicon compounds 2 Spectro-photometric method 2