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With the rapid development of global society, a large number of fossil fuels are used and human activities are becoming more frequent, which causing serious air pollution. The common air pollutants include nitrogen oxides, sulphur oxides, hydrogen sulphide, volatile organic compounds and others. Serious air pollution poses a great threat to human health and environmental health, according to the World Health Organization (WHO) announced that air pollution caused approximately 4.2 million people premature deaths in 2016 alone. Air pollution is now the one of global problems, it is very important and necessary to find some solutions to it. Thus, different actions have been taken, thereinto, the development of efficient technologies for the capture of toxic gases (e.g. NOx, SO2, H2S) from static and mobile sources is necessary, in order to achieve a cleaner environment.
Generally, the filters made from activated carbon impregnated with copper, silver, zinc, and molybdenum salts are used to capture the harmful gases (NOx, SO2, H2S), however, they are not adequately effective against all potential threats. On the other hand, activated carbons and any needed improvements on its performance are largely limited by lack of control over the metrics and functionality of the pores because of the highly amorphous nature of its carbon network, which seriously prevents the effective capture of harmful gases. Metal-organic frameworks (MOFs) with the unprecedented surface area and the control with which their pore metrics and functionality can be designed provide limitless potential for their structure to be tailored to carry out a specific application, thus MOFs show very promising capabilities for the capture of these harmful gases (NOx, SO2, H2S).
MOFs materials are widely explored for capture of harmful gases (NOx, SO2, H2S) since their adsorption properties can be tuned as a function of the topology and chemical composition of the pores. In addition, the interactions of such functional groups (coordinatively unsaturated metal sites, m-OH groups, defective sites and halogen groups) of MOFs can worked well with these harmful molecules. Some of typical examples are list in table1. The all below examples show good capture properties for the corresponding harmful gases.
Table 1. Summary of the adsorption capacity of harmful gases for selected MOFs
|Materials||BET surface area (m2/g)||Harmful gas||Adsorption (mmol/g)|
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