超声波振荡对活性氧化铝除氟性能的影响

在超声波振荡搅拌下，实验研究了活性氧化铝对氟离子的吸附性能，分析了活性氧化铝颗粒大小、超声波振荡时间、pH、活性氧化铝加入量及原水氟浓度对吸附性能的影响。研究结果表明：活性氧化铝结晶不完整及晶格的无序使得它具有更大的比表面积；使用超声波振荡时，其除氟速率比机械搅拌快得多，除氟前期其平均除氟速率达0.93 mg/min，是机械搅拌除氟速率的5.8倍。同时，采用超声波振荡达到平衡的时间是机械搅拌的1/7，其饱和吸附容量也有所提高；pH在5～7时，活性氧化铝的吸附容量大、除氟速率高；另外，活性氧化铝的加入量及原水氟浓度对除氟速率和吸附容量也有重要影响。

Defluoridation performance of activated alumina under ultrasonic agitation

The adsorption properties of activated alumina for fluorinions had been researched under the ultrasonic agitation， and the influence factors，such as particles size of activated alumina，ultrasonic agitation time，pH，Al2O3 dosage，and fluoride concentration of raw water，on adsorption performance had been also discussed.The results showed that：activated alumina had bigger specific surface area because of its incomplete crystallization and disorder lattice.The fluoride removal rate with ultrasonic agitation was much faster than that with mechanical agitation，and the average fluoride removal rate was up to 0.93 mg/min in the initial stage，which was 5.8 times of mechanical agitation.At the same time，the time to reach equilibrium using ultrasonic vibration was 1/7 of using mechanical agitation，and the saturated adsorption capacity was improved by using ultrasonic vibration.When the pH in the range of 5~7，activated alumina had a large adsorption capacity and a high rate of fluoride removal.In addition，the fluoride removal rate and adsorption capacity were also deeply influenced by the Al2O3 dosage and fluoride concentration of raw water.