Activated Carbon Prepared From Pomegranate Peel Microwave Assisted Koh Activation For Dyes Adsorption

Penghasilan karbon teraktif berasaskan kulit buah delima (KTKBD) melalui pengaktifan KOH berbantukan gelombang mikro telah berjaya dikaji. KTKBD yang terhasil telah digunakan untuk penyingkiran pewarna malacit hijau (MH) dan remazol brilliant biru reaktif (RBBR) daripada larutan akuas. KTKBD mempunyai luas permukaan yang tinggi 941.02 m2/g dan menunjukkan struktur liang meso tidak seragam serta terdapat pelbagai kumpulan berfungsi pada permukaan KTKBD. Kesan kepekatan awal pewarna (50-500 mg/L), masa sentuh (0-24 h), suhu larutan (30-60°C) dan pH larutan (2-12) telah dinilai melalui kajian penjerapan berkelompok. Jumlah penjerapan pewarna meningkat dengan peningkatan suhu, kepekatan awal pewarna dan masa sentuh. Penjerapan pewarna MH dan pewarna RBBR ke atas KTKBD adalah terbaik dipadankan oleh model Freundlich. Penjerapan kinetik MH dan RBBR ke atas KTKBD terbaik dipadankan oleh model kinetik pseudo-tertib kedua. Melalui kajian termodinamik, penjerapan pewarna MH dan RBBR ke atas KTKBD adalah berlaku secara jerapan fizikal, spontan dan endotermik. Melalui kajian mekanisma, kadar penjerapan dikawal oleh mekanisma serapan-filem. _______________________________________________________________________________________________________ The production of pomegranate peel based activated carbon (PPAC) through microwave assisted KOH activation has been successfully investigated. PPAC produced was used for removal of malachite green (MG) and remazol brilliant blue reactive (RBBR) dyes from aqueous solution. The PPAC has high surface area of 941.02 m2/g and demonstrated heterogeneous mesoporous type of pore structure with a presence of various functional groups on the PPAC’s surface. The effects of adsorbate initial concentration (50-500 mg/L), contact time (0-24 h), solution temperature (30-60oC) and solution pH (2-12) were evaluated through batch adsorption test. All dyes adsorption uptakes increased with increasing temperature, initial dyes concentration and contact time. Adsorption of MG and RBBR dyes onto PPAC were best fitted by Freundlich model. Adsorption kinetic of MG and RBBR dyes onto PPAC were best fitted by pseudo-second-order kinetic model. From the thermodynamic study, the MG and RBBR adsorption onto PPAC were physically controlled type, spontaneous and endothermic in nature. From the mechanism study, the adsorption rate was governed by film diffusion mechanism