Dalam penyelidikan ini, penyahwarnaan warna “Methyl Orange” (MO) telah dijalankan dengan menggunakan pemangkin yang disediakan melalui process pengsengnyawaan Ferum ke dalam tanah liat semulajadi (montmorilonit K10) dengan kehadiran H2O2. Pemangkin yang telah disediakan dispesifikasikan dengan menggunakan Mikroskop Imbasan Elektron (SEM) dan Fourier Transform Infrared Spektroskopi (FTIR). Keberkesanan pemangkin dalam penyahwarnaan warna dikesan malalui tindak balas pengaruh parameter seperti dos pemangkin, pH, suhu dan kepekatan awal hidrogen peroksida. Hasil optimis yang diperolehi bagi proses penyahwarnaan warna untuk MO adalah 2.0 mg/L dos pemangkin, pH 2.7-3.0 dan 2.5 ml kepekatan awal hidrogen peroksida pada suhu 60°C. Melalui beberapa eksperimen yang telah diuji dalam pelbagai keadaan mendapati bahawa aktiviti pemangkin meningkat sehingga mencapai nilai optimum setara dengan peningkatan jumlah dos pemangkin dan kepekatan hidrogen peroksida awal meningkat serta penurunan nilai pH. Dos pemangkin dan kepekatan awal hidrogen peroksida yang berlebihan boleh memberi impak kepada radikal hidroksil dan penurunan kadar penyahwarnaan warna. Hasil menunjukkan bahawa pemangkin heterogen mempunyai kestabilan jangka masa panjang dan aktiviti. kepekatan yang jauh lebih rendah daripada ion besi secara pukal serta memberi kelebihan yang besar kepada heterogen proses berbanding homogen sistem jenis Fenton.
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In this work, the decolorization of Methyl Orange was conducted using catalysts prepared by impregnation of Ferum on natural clay (montmorillonite K10) in the presence of H2O2. The prepared catalysts were characterized by Scanning Electron Microscope (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The effectiveness of these catalysts in the decolorization of the dye as well as the influence of reaction parameters like catalyst dosage, pH, temperature and initial concentration of hydrogen peroxide. The best conditions obtained for the decolorization process for MO dyes was 2.0 mg/L of catalyst dosage, pH from 2.7 to 3.0 and 2.5 ml of initial concentration of hydrogen peroxide at 60°C. Through a number of batch decolorization experiments under various conditions, it is found that the activity of the catalysts increased until they reached an optimum value by increasing amount of catalyst dosage, initial hydrogen peroxide concentrations, and decreasing the pH. The excess of catalyst dosage and initial hydrogen peroxide concentration may lead to the scavenging effect of hydroxyl radical and decreased the decolorization rate. The result indicates that the heterogeneous catalyst had a long term stability and activity. Significantly lower concentration of iron ions in the bulk after the treatment could give a great advantage of the heterogeneous Fenton over the homogeneous Fenton type systems. The experimental results showed that the heterogeneous Fenton process was an effective process for the decolorization of MO.
Fe-clay as effective heterogeneous fenton catalyst for the decolorization of methyl orange / Siti Natasha Abdul Aziz