In our world of rapidly increasing population and fast industrialization, design of valuernadded and ecofriendly high performance organicâ€“inorganic nanocomposites with higherrnstability for environmental remediation is becoming an active area of research in the fieldrnof inorganic material chemistry. The major objectives of this study are to design somerntypical surface hydrophobic ordered mesoporous nanocomposites by surface modificationrnof their hydrophilic surfaces by supporting with native vernonia oil derivatives andrnimmobilization by silver nanoparticles as potential heterogeneous catalyst for degradationrnof model organic dyes.rnIn the first part of this work, vernonia oil with unique natural epoxy moiety wasrnextracted from vernonia galamensis seed, which was purified and then derivatized tornmore active forms such as vernolic acid and vernolic acid mono alkyl esters like methyl,rnethyl and propyl esters as well as their mercapto imidazole functionalized derivatives, i.e.rnmethyl ester-IFVAME, ethyl ester-IFVAEE and propyl ester-IFVAPE. The presences ofrnthe functional groups were confirmed by FT-IR, 1H and 13C NMR spectroscopy andrnCHNS elemental analysis. In the second part of this work, vernolic acid methyl ester-rnVAME, and its mercapto imidazole functionalized (IFVAME) derivatives werernsupported on three types of ordered mesoporous nanomaterials with different surfacernproperties and pore sizes: OMMs: Al-MCM-41 (Si/Al=3 & 15), SBA-15 & periodicrnmesoporous organo silica-PMO. The supported materials were studied by powder X rayrndiffraction, thermogravimetric analysis, FT-IR spectroscopy and nitrogen sorptionrnisotherms. In the third part of this work, silver nanoparticles were synthesized on VAMErnand IFVAME supported Al-MCM-41, SBA-15, and PMO. The formations of the silverrnivrnnanoparticles were confirmed from wide angle powder XRD and the final distribution ofrnthe metal nanoparticles were studied using Transmission Electron Microscopy. Finally,rnthe potential catalytic applications of Ag-impregnated mOMMs were tested forrndegradation of model organic dyes (methyl orange and methylene blue) which was foundrnto be promising.