主要研究了苯并[a]芘在金属离子改性活性炭表面的脱附活化能,程序升温脱附实验测定了苯并[a]芘在Fe~(3+),Zn~(2+) 和Ag~+等金属改性活性炭上的脱附活化能,并应用软硬酸碱理论分析和讨论了其脱附活化能的差异.结果表明,苯并[a]芘在改性活性炭上脱附活化能的顺序如下:Ag(Ⅰ)/AC＞AC＞Zn(Ⅱ)/AC＞Fe(Ⅲ)/AC.和原始活性炭相比,Ag~+增强了苯并[a]芘和活性炭表面间的结合力,Zn~(2+) 和Fe~(3+)减弱了苯并[a]芘和活性炭表面间的结合力,并首次用软硬酸碱理论解释了试验结果.
This work is mainly concerned with the study of the effects of loading different metal ions onto activated carbon surfaces on the desorption activation energy of benzo[a]pyrene (B[a]P).Temperature programmed desorption (TPD) experiments were conducted to measure the desorption activation energy,E_d,of B[a]P) on the activated carbons separately dopped with ions Fe~(3+),Zn~(2+) and Ag~+,and the effects of loading metal ions onto the activated carbons on the interaction between B[a]P the carbon surfaces were discussed.Results showed that the E_d of B[a]P on the activated carbons followed the order:Ag(Ⅰ)/AC＞AC＞Zn(Ⅱ)/AC＞Fe(Ⅲ)/AC.In comparison with the unmodified activated carbon AC,the loading of Ag~+ onto the activated carbon surfaces enhanced the interaction between B[a]P and the surfaces,while the loading of Zn~(2+) and Fe~(3+) onto the activated carbon surfaces weakened the interaction between B[a]P and the surfaces so that the E_d of B[a]P on the surfaces became smaller to some extent.The results were discussed by HSAB.
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