Sorption characteristics of diuron on merchant biomass ash and biomass power plant ashes
敌草隆在市售草木灰及生物质电厂灰上的吸附特性研究

The surface characteristics and chemical compositions of 1 merchant biomass ash and 3 biomass power plant ashes were measured. The sorption isotherms and kinetics of one pesticide-diuron were examined. The data demonstrated that the sorption models of diuron on both merchant biomass ash and biomass fuel ashes were complex multi-reaction process. It was presumably due to their complex space configuration and chemical compositions. BET surface area-normalized maximal sorption quantities showed that power plant ash1 and 3 with the highest micro-and meso-pores exhibited the highest surface area-normalized saturated sorption quantity, implying that surface area and pore size distribution of sorbents were crucial factors determining saturated sorption quantities. The organic carbon content-normalized sorption capacities indicated that the power plant ashes, which contained higher contents of paraffin and aromatic hydrocarbons, exhibited higher normalized sorption capacities than merchant plant ash, which had higher content of carboxyl groups. It was implied that the organic carbon content and chemical composition, especially the content of non-polar organic matter, strongly influenced the sorption capacity of hydrophobic organic chemicals. The results indicated that the biomass power plant ashes can be used at in-situ sorbent amendments of contaminated sediment.