Prestasi penjerapan metilena biru (MB) ke atas zeolite yang disintesis daripada abu kelapa sawit dikaji menggunakan kaedah kelompok. Abu kelapa sawit melalui proses pengaktifan kimia menggunakan KOH dan rawatan hidrotermal. Pencirian zeolite yang siap disintesis dilakukan menggunakan mesin spektroskopi transformasi fourier gelombang merah. Pemilihan penjerap terbaik dilakukan dengan memanipulasi nisbah berat kaolin iaitu (1,2 dan 3 gram) semasa mensintesis penjerap berasaskan abu kelapa sawit. Melalui prestasi penjerapan, penjerap berasaskan abu kelapa sawit dengan nisbah 3 g kaolin adalah penjerap terbaik dengan peratusan keefisienan penyingkiran metilena biru sebanyak 89.78 peratus. Kesan kepekatan awal pewarna (25-500 mg/L), masa sentuhan (0-27 jam), pH (3-12) dan suhu larutan (30-50⁰C) turut telah dinilai. Model pseudo-tertib kedua didapati menggambarkan mekanisma penjerapan lebih baik berbanding model pseudo-tertib pertama. Didapati bahawa model Freundlich adalah paling berpadanan untuk data garis sesuhu MB. Nilai kebolehan penjerapan maksima untuk penjerap ketas metilena biru adalah 337.30, 341.20 dan 359.45 mg/g pada suhu masing-masing 30, 40 dan 50°C. Keputusan ini menunjukkan penjerap berasaskan abu kelapa sawit mempunyai potensi untuk dibangunkan sebagai penjerap kos rendah daripada sisa industri.
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The adsorption performance of methylene blue (MB) on zeolite synthesized from palm ash was examined using a batch method. Palm ash undergoes chemically facilitated KOH activation and hydrothermal treatment with oil palm ash as precursor. Characterization of the prepared zeolite was done using Fourier transform infrared spectroscopy (FTIR). Selection of the best adsorbent was done by varying the kaolin weight ratio (1, 2, and 3 gram) during oil palm ash derived adsorbent synthesis. From the adsorption performance oil palm ash derived adsorbent with 3 g kaolin was the best adsorbents at 89.78% MB removal efficiency. The effects of initial dye concentration (25-500 mg/L), temperature (30°C-50°C), and pH (3-12) on the adsorption of MB on adsorbent were studied. Pseudo-second-order kinetics was found to describe the adsorption process better than pseudo-first-order kinetics. Freundlich and Langmuir isotherms applied on the adsorption data reveal that data best fitted Freundlich model. The maximum adsorption capacity values of the adsorbent for MB were 337.30, 341.20 and 359.45 mg/g at 30°C, 40°C and 50°C respectively. These results show that the oil palm ash derived adsorbent have the potential for further development of low-cost adsorbents from industrial waste.
Adsorption of methylene blue onto oil palm ash derived adsorbent / Mohammad Ashraf Marzukhi