Land desertification is a complex concept which refers to land degradation in the arid region, semi-arid region and sub-humid arid region caused by various factors including climate variability and human activities. I...Land desertification is a complex concept which refers to land degradation in the arid region, semi-arid region and sub-humid arid region caused by various factors including climate variability and human activities. It is not only an environmental problem, but also a social and economic one[1]. Land desertification will reduce the biological and economic production potential of the land and even exacerbate the trend of land desertification, leaving serious impact on the economic, social development and national lives of Jilin. In addition, it will result in ecological environment deterioration, microclimate variability, an increase in natural disaster and high frequency of sand blowing. Taking the special geographic area in western Jilin (especially the Tongyu County) as an example, this paper discusses the natural and social factors for the forming of desertification in the microcosmic level, analyzes the current situations and provides reasonable recommendations.展开更多
Imidazolate-based ZIF-8 catalysts M@ZIF-8 (M = Au NR, Au@Ag NR, or Au@PtAg NRT;NR = nanorod, NRT = nanorattle), were assembled. Au NRs acted as the core for the epitaxial growth of the Ag shell, and oxidative etching ...Imidazolate-based ZIF-8 catalysts M@ZIF-8 (M = Au NR, Au@Ag NR, or Au@PtAg NRT;NR = nanorod, NRT = nanorattle), were assembled. Au NRs acted as the core for the epitaxial growth of the Ag shell, and oxidative etching of Au@Ag NRs led to Au@PtAg NRTs with K2PQI4 aqueous soluti on. All metal nano rods (MNRs) and metal nano rattles (MNRTs) were well dispersed and fully en capsulated in ZIF-8. Au @ PtAg NRTs encapsulated in ZIF-8 could lead to enhanced stability and selectivity for catalytic applications, combining the advantages of ZIF-8 (tailorable porosity) with the high surface area and improved optical sensitivity of rod-shaped NRTs. The catalyst Au @ PtAg@ZIF-8 exhibited efficient catalytic activity and CO selectivity for the gas-phase photoreduction of CO2 with H2O.展开更多
文摘Land desertification is a complex concept which refers to land degradation in the arid region, semi-arid region and sub-humid arid region caused by various factors including climate variability and human activities. It is not only an environmental problem, but also a social and economic one[1]. Land desertification will reduce the biological and economic production potential of the land and even exacerbate the trend of land desertification, leaving serious impact on the economic, social development and national lives of Jilin. In addition, it will result in ecological environment deterioration, microclimate variability, an increase in natural disaster and high frequency of sand blowing. Taking the special geographic area in western Jilin (especially the Tongyu County) as an example, this paper discusses the natural and social factors for the forming of desertification in the microcosmic level, analyzes the current situations and provides reasonable recommendations.
基金We gratefully acknowledge the financial support from the National Natural Science Foundation of China (No. 21371058).
文摘Imidazolate-based ZIF-8 catalysts M@ZIF-8 (M = Au NR, Au@Ag NR, or Au@PtAg NRT;NR = nanorod, NRT = nanorattle), were assembled. Au NRs acted as the core for the epitaxial growth of the Ag shell, and oxidative etching of Au@Ag NRs led to Au@PtAg NRTs with K2PQI4 aqueous soluti on. All metal nano rods (MNRs) and metal nano rattles (MNRTs) were well dispersed and fully en capsulated in ZIF-8. Au @ PtAg NRTs encapsulated in ZIF-8 could lead to enhanced stability and selectivity for catalytic applications, combining the advantages of ZIF-8 (tailorable porosity) with the high surface area and improved optical sensitivity of rod-shaped NRTs. The catalyst Au @ PtAg@ZIF-8 exhibited efficient catalytic activity and CO selectivity for the gas-phase photoreduction of CO2 with H2O.
