Adsorption and Kinetic Characteristics of Pb2+ Removal by Fly Ash from Biomass Power

Abstract
本文研究了生物质电厂飞灰对溶液中Pb离子的吸附特性，并对吸附动力学进行了分析。结果显示：飞灰对Pb离子具有较好的脱除能力；随着Pb2+浓度由0.100 ppm增加20.000 ppm，在15℃条件下，Pb的脱除率由97%降低到49.6%；在25℃条件下，Pb的脱除率由100%降低到50%；在35℃条件下，Pb的脱除率由100%降低到55.6%。当Pb离子的浓度较高时，升高温度对提高飞灰脱除能力的影响有限。飞灰除铅的吸附动力学过程符合伪二级动力学速率方程。 Adsorption characteristics and kinetic of Pb2+ removal by fly ash from biomass power plant were studied in the paper. The results indicated a good capacity of the fly ash to Pb2+ removal. As the Pb2+ concentration increased from 0.100 ppm to 20.000 ppm, the removal rate of Pb2+ decreased from 97% to 49.6% at 15˚C; and it decreased from 100% to 50% at 25˚C; at 35˚C, the removal rate of Pb2+ was reduced from 100% to 55.6%. When the Pb2+ had a higher concentration, enhancing temperature had limited impact on the removal capacity of fly ash. The Pb2+ removal process by the fly ash accorded with the pseudo-second-order kinetic model.