Penghasilan air sisa pewarna dari industri tekstil yang disalurkan ke sumber air telah menyebabkan beberapa masalah alam sekitar dan ekologi disebabkan kandungan bahan beracunnya yang tinggi. Sejak akhir-akhir ini, karbon teraktif (KT) telah digunakan sebagai bahan penjerap untuk merawat air sisa pewarna. Dalam kajian ini, karbon teraktif berasaskan kulit nenas (KTKN) telah disediakan secara pengaktifan fizikal melalui gasifikasi karbon dioksida (CO2) dengan menggunakan penyinaran gelombang mikro. Keadaan optimum bagi kekuatan kuasa gelombang mikro dan masa pengaktifan KTKN untuk penjerapan pewarna metilena biru dilaksanakan menggunakan Kaedah Permukaan Sambutan. Keadaan optimum yang diperoleh untuk KTKN adalah pada 440 W kuasa radiasi dan 5 minit masa pengaktifan telah menghentikan penyingkiran metilina biru sebanyak 84.55%. KTKN yang optimum mempunyai luas permukaan BET, permukaan liang meso, jumlah isipadu liang dan kandungan karbon tetap yang tinggi masing-masing sebanyak 544.07 m2/ g, 285.32 m2/g, 0.3035 cm3/g dan 67.92%. Liang KTKN adalah berliang meso dengan diameter liang iaitu 2.23 nm. Kesan kepekatan pewarna awal dan masa tindakbalas juga telah dikenal pasti dalam kajian ini. Penjerapan metilina biru oleh KTKN meningkat dengan peningkatan kepekatan pewarna awal dan masa tindakbalas. Data keseimbangan penjerapan metilina biru ke atas KTKN sesuai dipadankan dengan model Langmuir dengan kapasiti penjerapan selapis sebanyak 84.76 mg/g. Sementara itu, kajian kinetik metilina biru ke atas KTKN diwakili oleh model pseudo-tertib kedua. Rintangan penyebaran antara zarah meningkat apabila saiz zarah meningkat.
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Dye effluents generated from the textile industries were released to the water bodies causes several environmental and ecological problem due to its high toxic compound. In recent years, agricultural waste based activated carbon is used as adsorbent for treating the dyes wastewater. In this study, the pineapple peel based activated carbon (PPAC) was prepared via physical activation which undergo carbon dioxide (CO2) gasification by using microwave irradiation. The optimization of the PPAC preparation conditions of microwave power and activation time for adsorption of methylene blue (MB) dye was done by using Response Surface Methodology (RSM). The optimum preparation conditions for PPAC were obtained at 440 W of radiation power and 5 min of activation time which resulted the MB removal of 84.55 %. The optimized PPAC has high BET surface area, mesopore surface area, pore volume and fixed carbon content of 544.07 m2/g, 285.32 m2/g, 0.3035 cm3/g and 67.92 % respectively. The PPAC was mesoporous type with the pore diameter of 2.23 nm. The MB adsorption by PPAC increased with increasing of initial dye concentrations and contact time. The MB adsorption equilibrium onto PPAC was best fitted by Langmuir isotherm model with monolayer adsorption capacity of 84.76 mg/g. Meanwhile, the kinetic studies of MB adsorption onto PPAC was best represented by pseudo-second order kinetic models. The resistance of intraparticle diffusion increased as the particle size increased.
Synthesis of pineapple peel based activated carbon via microwave irradiation for methylene blue (mb) dye removal / Nur Amni Md Anuar