环境工程学报2012，Vol.6Issue(8)：2600-2606,7.
粉煤灰对水溶液中磷的吸附性能及机理
Performance and mechanism of phosphorus adsorption in aqueous solution with fly ash
摘要
Abstract
Fly ash was used as adsorbent to remove P from solution, phosphorus adsorption kinetics, ther- modynamics as well as the influences of pH and adsorbent dosage on P removal effects were all investigated, the mechanism of P adsorption onto fly ash was preliminarily studied. Results indicated that P could be removed by fly ash efficiently under the given conditions. With the concentration of P increased from 10 mg/L to 80 mg/L, the equihbrium adsorption capacity of fly ash increased from 0.46 mg P/g fly ash to 2.44 mg P/g fly ash, while the removal efficiency decreased from 92.2% to 61.1%. The optimal dosage of fly ash was 0.6 - 1.5 g fly ash/ mg P, even when P concentrations were different; under the same conditions, the initial sorption rate was im- proved by 3 times when the temperature increased from 25C to 45C. Langmuir, Freundlich and D-R isotherms were a[l fit to the adsorption characteristics of fly ash （R2 〉 O. 98 ） The results obtained from P desorption indi- cated that with lower P concentration（ 〈 50 mg/L） , the adsorption was mainly chemical reaction, whereas, with higher P concentration（ 〉80 rag/L） , physical adsorption was the main process关键词
粉煤灰/除磷机理/物理吸附/化学吸附Key words
fly ash/phosphorus removal mechanism/physical adsorption/chemical adsorption分类
资源环境引用本文复制引用
周光红,项学敏,李厚芬,周集体..粉煤灰对水溶液中磷的吸附性能及机理[J].环境工程学报,2012,6(8):2600-2606,7.基金项目
国家水体污染控制与治理科技重大专项 （）
