부산대학교 도서관

A common problem encountered in the utilization of CuCl-based CO adsorbents was the oxidation tendencyof CuCl under atmospheric conditions, with a rapid decrease in an initial CO adsorption uptake overthe storage period. In this work, chitosan-modified CuCl-alumina-based composites were prepared by awet-impregnation method followed by N2 calcination. With the chitosan to alumina weight ratio of 0.15,the resultant fresh composite named 30Cu-0.15chi-Al (30 wt% Cu+/chitosan impregnated alumina) gavethe highest initial CO adsorption uptake (19 cm3/g) among the analyzed samples. Interestingly, this compositealso preserved its initial CO adsorption uptake throughout the 30-day air-exposed storage owing tothe antioxidant effect of the stable Cu-CN constituted organometallic complexes which had been developedon the composite surface during the calcination step. These Cu complex clusters constructed theoxygen-resistant shield for the doped CuCl which was well dispersed inside the porous structure, as confirmedthrough the analysis of SEM, EDS and XPS. Besides, this sample achieved a higher CO selectivityfactor (5.2) over CO2 because of the CO affinity of Cu1+ions by p complexation reaction. This study pointedout a stably efficient CO adsorbent modified with chitosan, which has a great potential to be industrialremediation of CO pollution.