Valix M, Cheung W H, McKay G
Department of Chemical Engineering, University of Sydney, Bldg. J01, Sydney NSW 2006, Australia.
Chemosphere. 2004 Aug;56(5):493-501. doi: 10.1016/j.chemosphere.2004.04.004.
Activated carbons were prepared from bagasse through a low temperature (160 degrees C) chemical carbonisation treatment and gasification with carbon dioxide at 900 degrees C. The merit of low temperature chemical carbonisation in preparing chars for activation was assessed by comparing the physical and chemical properties of activated carbons developed by this technique to conventional methods involving the use of thermal and vacuum pyrolysis of bagasse. In addition, the adsorption properties (acid blue dye) of these bagasse activated carbons were also compared with a commercial activated carbon. The results suggest that despite the high ash content of the precursor, high surface areas (614-1433 m2 g(-1)) and microporous (median pore size from 0.45 to 1.2 nm) activated carbons can be generated through chemical carbonisation and gasification. The micropore area of the activated carbon developed from chars prepared by the low temperature chemical carbonisation provides favourable adsorption sites to acid blue dye (391 mg g(-1) of carbon). The alkalinity of the carbon surface and total surface area were shown to have complementary effects in promoting the adsorption of acid blue dye. Adsorption of the anionic coloured component of the acid dye was shown to be promoted in carbon exhibiting alkaline or positively charged surfaces. This study demonstrates that activated carbons with high acid dye adsorption capacities can be prepared from high ash bagasse based on low temperature chemical carbonisation and gasification.
通过低温（160摄氏度）化学碳化处理以及在900摄氏度下用二氧化碳进行气化，从甘蔗渣制备了活性炭。通过将该技术制备的活性炭的物理和化学性质与涉及甘蔗渣热解和真空热解的传统方法进行比较，评估了低温化学碳化在制备用于活化的炭方面的优点。此外，还将这些甘蔗渣活性炭的吸附性能（酸性蓝染料）与一种商业活性炭进行了比较。结果表明，尽管前驱体的灰分含量高，但通过化学碳化和气化可以生成高比表面积（614 - 1433平方米/克）和微孔（中位孔径为0.45至1.2纳米）的活性炭。由低温化学碳化制备的炭所开发的活性炭的微孔面积为酸性蓝染料（391毫克/克碳）提供了有利的吸附位点。碳表面的碱度和总表面积在促进酸性蓝染料吸附方面表现出互补作用。在具有碱性或带正电表面的碳中，酸性染料的阴离子有色成分的吸附得到促进。这项研究表明，基于低温化学碳化和气化，可以从高灰分甘蔗渣制备具有高酸性染料吸附能力的活性炭。
