石英砂负载氧化铁的表征及其除锑吸附性能研究

Characterization of iron oxide coated sand and its adsorption properties in antimony removal

通过SEM／EDAX以及Nova-1000表面分析仪对石英砂负载的氧化铁颗粒进行了表征，发现负载氧化铁的粒径为200nm左右，其表面孔径及孔隙率分别为2×10^-9～9×10^-9m及0．11％，负载氧化铁的石英砂的比表面积为原砂的5倍．考察了石英砂负载氧化铁（IOCS）在不同的实验条件下（吸附时间，pH值，温度等）对水溶液中锑的去除效果，在pH为3—9范围内，其去除率均超过了98％．吸附动力学及吸附等温线实验数据分别符合二级反应动力学模型及Langmuir等温吸附模型．热动力学实验结果进一步表明：IOCS吸附锑的过程是自发的、吸热的化学吸附反应．

Iron oxide coated sand （IOCS） was characterized through SEM/EDAX and Nova-1000 surface micrograph. It was found that the particle size of iron oxide was about 200nm, the pore size distribution and the particle porosity of the iron oxide were ranged 2 × 10^-9～9 × 10^-9m and 0. 11%, respectively. The BET special surface area of IOCS was 5 times that of uncoated sand. The adsorption experiments performed under different conditions in terms of time, pH and temperature. The results indicated that removal of Sb by IOCS could be above 98% when pH ranged from 3 to 9. The adsorption data obtained from kinetic and isothermal experiments were well fitted to the second order rate model and the Langmuir adsorption isotherm, respectively. Further thermodynamic investigations suggested that the adsorption of Sb on IOCS was spontaneous and endothermic.