Fulvic acid (FA) in soil ubiquitously affect the long-term benefits of biochars as soil amendments. Compared with the hydrophobic organic compounds, the sorption of ionizable organic pollutants (IOPs) on biochars was more complicated influenced by FA for their ionic groups. To investigate the effect of coated FA on interaction of biochars and IOPs, we conducted batch sorption isothermal experiments and series sorption experiments under different pH values. Biochars used in this research were pyrolyzed at 300°C, 500°C and 700°C, which were on behalf of low, medium and high temperature biochars, respectively. Sorption ability of both original biochars or FA coated ones fell sharply from acidic to alkaline. In terms of alkaline condition, the coating of FA evidently depressed the sorption ability of all three biochars. Under acidic condition, the coating of FA increased the sorption of low-temperature biochar, while decreased that of high-temperature biochar. The coating of FA changed surface areas and functional groups of biochars. For high-temperature biochar, coated FA reduced surface area and consequently decreased sorption ability. As for low-temperature biochar, FA coated on biochar played as partition phase, therefore increasing sorption ability of biochar. This research indicated that FA in soil influenced on interaction of biochar with IOPs, and the influences varies with the structure of biochars.

Effect of coated fulvic acid on interaction of biochars and ionizable organic pollutants

254th National Meeting (2017)

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