Preparation and characterization of activated carbon produced from rice straw by (NH₄)₂HPO₄ activation
2011
Gao, Pin | Liu, Zhen-hong | Xue, Gang | Han, Bin | Zhou, Mei-hua
Effects of different pretreatment protocols in (NH₄)₂HPO₄ activation of rice straw on porous activated carbon evolution were evaluated. The pore structure, morphology and surface chemistry of obtained activated carbons were investigated by nitrogen adsorption, scanning electron microscopy and Fourier transform infrared spectroscopy. It was found that pretreatment combining impregnation with (NH₄)₂HPO₄ and preoxidation could significantly affect the physicochemical properties of prepared activated carbons. The apparent surface area and total pore volume as high as 1154m²/g and 0.670cm³/g were obtained respectively, when combined process of impregnation followed by preoxidation at 200°C and activation at 700°C was carried out. Meanwhile, the activated carbon yield and maximum methylene blue adsorption capacity up to 41.14% and 129.5mg/g were achieved, respectively. The results exhibited that (NH₄)₂HPO₄ could be an effective activating agent for producing activated carbons from rice straw.
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