超声波辅助氯化铁改性煤渣吸附水中氟离子  

REMOVAL OF FLUORIDE FROM WATER USING ULTRASONIC ASSISTING FERRIC CHLORIDE MODIFIED CINDER

作　　者：沈俊菊[1] 李彦儒[1] 王丽娟[1] 

机构地区：[1]山西师范大学化学与材料科学学院,山西临汾041004

出　　处：《水处理技术》2014年第2期31-34,38,共5页Technology of Water Treatment

基　　金：山西省高校高新技术产业化项目(20110016)

摘　　要：为提高廉价废弃煤渣对水中F的吸附能力，采用超声波辅助的方法制备了氯化铁改性煤渣（UFC），通过扫描电子显微镜及X射线粉末衍射仪对其进行了表征；考察了溶液pH和吸附剂投加量对吸附F-的影响，并对UFC的吸附动力学和等温吸附特征进行了研究。结果表明，相对于原煤渣，UFC对F-有更好的亲和性。当F-初始质量浓度为50mg／L、投加量为20g／L时，pH在2～11内UFC的吸附量均在2．1mg／g以上。UFC对F-的吸附行为遵循表观2级动力学模型，不同F-含量下的等温吸附实验数据符合Langmuir等温式，40℃时最大饱和吸附容量达到46．08mg／g。热力学参数表明UFC吸附F-是自发的、吸热的、熵增加的过程。Waste cinder has been used as a low cost adsorbent. To improve its adsorption capacity for fluoride, ultrasonic assisting ferric chloride modified cinder （UFC） was prepared and characterized by SEM and XRD. Effects of solution pH and the dosage of absorbent were tested. Adsorption kinetics and isotherm of fluoride on UFC were studied. Experimental results showed that UFC had stronger absorption affinity to fluoride than cinder. The fluoride adsorption capacity was above 2.1 mg/g in pH range of 2-1 1 with the initial fluoride concentration of 50 mg/L and the dosage of 20 g/L. Kinetic studies revealed fluoride adsorption process followed pseudo-second-order model. The adsorption isotherm data complied well with Langmuir adsorption isotherm and the maximum adsorption capacity could reach 46.08 mg/g at 40 ℃. In addition, thermodynamic parameters indicated that the adsorption process of fluoride on UFC was a spontaneous and endothermic process of entropy increase.

关 键 词：改性煤渣 超声波 氯化铁 除氟 

分 类 号：TQ424[化学工程]