Enrichment and Identification of Condensed Aromatics in a Bio-oil from Degraded Wheat Stalk in Supercritical Ethanol

摘要

Crop stalks (CSs) are common agricultural wastes in China. The annual yield of CSs in China is ca. 0.7 billion tons,1 but only 1/3 of CSs is used. The problem of dealing with tons of CSs needs to be solved urgently. Part of CSs is piled up along roads, ditches, and even beside houses, which occupies a lot of space and hinders the traffic During harvest seasons, most of the CSs in China are burned to ensure normal farming.CS combustion in the field degrades air quality by emitting soot, carbon monoxide, methane, and other volatile organic compounds and forming aerosol.Condensed aromatics (CAs) are important parts of aerosol and ubiquitous in the environment.They are primarily generated from anthropogenic pollution, such as incomplete combustion of oil and biomass in boiler, heating installation, commercial installation, and engine.