玉米芯活性炭改性及其对CO_2吸附性能

研究了提高玉米芯活性炭对CO2气体吸附性能的方法和途径,对自制的玉米芯活性炭进行了氧化改性和还原改性.改性后C元素质量分数都减少了10%左右.经硝酸和硝酸盐氧化改性后其表面含氧官能团明显增多;经碳酸盐碱性还原改性后引入了CO2-3根;经氨水碱性还原改性后引入了大量氨基基团,表明成功地对制备的玉米芯活性炭进行了氧化和还原改性.其中,利用Ca(NO3)2改性后样品对CO2的吸附量比改性前提高了21.2%;经过Na2CO3改性后样品对CO2的吸附量提高了28.5%.因此,制备的玉米芯活性炭经过Na2CO3改性后更有利于其应用于CO2吸附分离.

Modification of Corncob ActiVated Carbon and Adsorption Properties of CO2

The method to improving the adsorption properties of CO2 of as-synthesized corncob activated carbon was investigated. The oxidative modification and reductive modification were carried out. The results showed the content of carbon (C) reduces by approximate 10% during the process. The samples modified by nitric acid and nitrates obtained more oxygenic functional groups on the surfaces. Those treated with carbonates acquired additional CO2-3 as well. Those improved via ammonia introduced a mass of amidogens. To sum up， oxidative and reductive modifications are well applied to the synthetic activated carbons. In particular， the CO2 adsorbing capacities of samples modified with Ca(NO3)2 and Na2CO3， compared with that of the raw activated carbon， increase by 21.2% and 28.5%， respectively. Therefore， the reductive modification with carbonates such as Na2CO3 performs better in improving the CO2 adsorption capacities of the as-synthesized corncob activated carbon.