Emission of VOCs and research progress for hydrophobic adsorbents under high humidity conditions
VOCs(volatile organic compounds)are important precursors of ozone pollution,secondary organic aerosols and fine particulate matter,which pose a serious threat to the biosphere and human health.VOCs have wide-ranging sources and high emissions,and VOCs emission control enters a refined stage.The airflow of VOCs emitted from industrial sources often contains water vapor,which has a negative impact on existing control measures and increases the difficulty for treating VOCs.Adsorption is widely used in industrial VOCs emission owing to low cost,low consumption and mature process.The humidity of exhaust gases emitted from industries such as petrochemicals,pharmaceuticals,fine chemicals,manufacturing,printing and dyeing ranges from 10％to 70％,which mainly consists of alkanes,olefins,aromatics,etc.The adsorption of VOCs under high humidity conditions is mainly achieved through hydrophobic modifications of carbon materials,MOF(metal organic framework)and molecular sieves.Common hydrophobic modification methods include the introduction of non-polar functional groups and hydrophobic coatings.This work summarized the sources and emission characteristics of VOCs,and reviewd the current research progress of hydrophobic adsorbents to provide ideas for the treatment of VOCs under high humidity conditions.
high wet waste gasVOCsemission characteristicshydrophobic adsorbents
万方数据
维普
