Effect of Phosphoric Acid Modification on Characteristics of Rice Husk Activated Carbon

iranica journal of energy and environment Pub Date : 2015-01-01 DOI:10.5829/IDOSI.IJEE.2015.06.01.05

Y. S. Mohammad, E. M. Shaibu-Imodagbe, S. Igboro, A. Giwa, C. A. Okuofu

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引用次数: 14

Abstract

Activated carbon was produced from rice husk via thermal pretreatment preceding chemical modification with phosphoric acid. In order to study the effect of phosphoric acid modification, the characteristics of the activated carbon produced were determined before and after acid modification and subsequently compared. These characteristics include surface morphology, surface functional groups, surface area, average pore diameter and pore volume. Characterization results showed that modification of the thermally treated rice husk with phosphoric acid enhanced the surface area of the activated carbon from 12.47 to 102.4m/g. The average pore diameter was also enhanced from 2.4 to 1.82nm. It also shows improvement in micropore volume from 0.0052 to 0.034cm/g. SEM analysis confirmed the improvement in surface area and pore development resulting from the phosphoric acid modification while FTIR analysis revealed the existence of phosphorous-oxy-containing functional groups on the surface of the phosphoric acid modified activated carbon. doi: 10.5829/idosi.ijee.2015.06.01.05

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磷酸改性对稻壳活性炭性能的影响

以稻壳为原料，经热预处理后磷酸化学改性制备活性炭。为了研究磷酸改性的效果，测定了酸改性前后生产的活性炭的特性，并进行了比较。这些特征包括表面形貌、表面官能团、表面积、平均孔径和孔隙体积。表征结果表明，用磷酸对热处理后的稻壳进行改性，使活性炭的比表面积由12.47 m/g提高到102.4m/g。平均孔径由2.4 nm增加到1.82nm。微孔体积由0.0052 cm/g提高到0.034cm/g。SEM分析证实了磷酸修饰后活性炭的表面积和孔隙发育有所改善，FTIR分析发现磷酸修饰后活性炭表面存在含磷氧官能团。doi: 10.5829 / idosi.ijee.2015.06.01.05

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iranica journal of energy and environment

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