Degradasi rumusan Reaktif Oren 16 menggunakan pemangkin Fe3+ yang disokong oleh komposit zeolite-alumina bersama hydrogen peroksida melalui proses “heterogeneous Fenton” telah dikaji. Pemangkin komposit itu disediakan melalui kaedah impregnasi basah dan ditentukan dengan menvariasikan dos alumina (2-10wt%) dan amaun ion besi (2-8wt%). Pencirian pemangkin oleh analisis permukaan dan SEM menunjukkan bahawa pemangkin komposit itu berpori meso, mengikuti isoterma jenis IV dan histeris jenis H3. Tambahan lagi, aktiviti pemangkin itu didapati mengikuti reaksi kinetik orde-pertama dengan tenaga pengaktifan sebanyak 87.85 kJ/mol. Efek pelbagai parameter termasuklah konsentrasi permulaan pewarna (15-90ppm), permulaan pH (2-5), dos pemangkin (0.5-4.0g/L), konsentrasi hydrogen peroksida (50-150μL), suhu reaksi (30-50⁰C) dan konsentrasi anion bukan organik (natrium nitrat) (0.1-0.3g) pada keberkesanan degradasi juga telah dikaji. Dalam 95% keberkesanan degradasi pewarna telah dicapai dalam masa 60 minit reaksi, menuruti kondisi yang optimum: 30 ppm konsentrasi permulaan pewarna, 2.64 pH permulaan, 0.015g/L dos pemangkin, 75 μL hydrogen peroksida pada suhu 40⁰C. Konsentrasi natrium nitrat yang paling kurang didapati paling berkesan dalam mendegradasikan pewarna RO16. Dengan keberkesanan degradasi sebenyak 79%,, 50% pembuangan COD telah tercapai. Tambahan lagi, pemangkin yang disediakan tidak melarut lesapkan besi kedalam rumusan tersebut dan keberkesanannya boleh digunapakai walaupun setelah empat eksperimen berturut. Konklusinya, pemangkin komposit berpori-meso yang disediakan ini sesuai digunakan untuk mendegradasikan pewarna RO16.
_______________________________________________________________________________________________________
The degradation of Reactive Orange 16 (RO16) solution using zeolite-alumina supported Fe3+ composite catalyst and adding hydrogen peroxide (heterogeneous Fenton process) have been studied. The composite catalyst was prepared using wet impregnation method and determined by varying alumina dosing (2-10wt%) and iron ions loading (2-8wt%). Catalyst characterizations conducted using surface analysis and SEM showed that the composite catalyst was mesoporous in nature following type IV isotherm with H3 type hysteresis. Besides, the catalytic activity was found to follow first-order reaction kinetics with 87.85 kJ/mol activation energy. The effects of different parameters such as initial dye concentration (15-90ppm), initial pH of the solution (2-5), catalyst dosage (0.5-4.0g/L), hydrogen peroxide concentration (50-150μL), reaction temperature (30-50⁰C) and inorganic anions (sodium nitrate) concentration (0.1-0.3g/L) on the degradation efficiency of the process were investigated. Around 95% degradation efficiency of RO16 solution were achieved in 60 minutes reaction time, under the following conditions: 30 ppm of initial dye, initial pH of 2.64, 1.5g/L of catalyst dosage, 75 μL of hydrogen peroxide at 40⁰C. The least of sodium nitrate concentration was better for the degradation of RO16. Also, with 79% of degradation efficiency, 50% of COD removal was achieved. Moreover, the catalyst does not leach any iron into the solution and its effectiveness can be reproduced after 4 consecutive experiments. Therefore, it was concluded that the mesoporous composite catalyst prepared is good for the degradation of RO16.
Synthesis and characterization of fe doped zeolite alumina composite catalyst for degradation of reactive orange 16 / Siti Nuramirah Nor’azlan