摘要
针对现行改性活性氧化铝吸附剂尚未有系统研究,对工业指导性弱等问题,本文以实际含氟废水为考察对象,对比考察了多种改性剂种类的影响,优选制备镁基活性氧化铝,并利用Pseudo-First-Order(PFO)和Pseudo-Second-Order(PSO)非线性模型对其脱氟机理进行模拟研究.研究结果表明,相较锌、钙、镧改性,硫酸镁改性能明显提高活性氧化铝对氟的吸附性能.当硫酸镁浓度为0.05 mol/L、液固比为8、焙烧温度为350℃,吸附剂中出现活性相AlOOH和MgAl_(2)(OH)_(8),除氟能力达到最佳.采用此层状镁基活性氧化铝吸附剂去除废液氟时,在吸附时间2.5 h、除氟温度70℃时,氟脱除率和平衡吸氟量达到最佳,分别为70.70%和8.36 mg/g,且吸附废液氟离子过程遵循PSO模型,吸附过程为镁基活性氧化铝吸附剂表面物质与废液中氟离子发生化学反应.
Addressing the lack of systematic research and weak industrial guidance on current modified active alumina adsorbents,this paper investigates actual fluoride-containing wastewater.It compares the effects of various modifiers,selecting magnesium-based active alumina for optimal preparation.The study uses Pseudo-First-Order(PFO)and Pseudo-Second-Order(PSO)nonlinear models to simulate the defluoridation mechanism of this adsorbent.The results show that magnesium sulfate modification significantly enhances the fluoride adsorption capacity of active alumina compared to modifications with zinc,calcium,and lanthanum.The optimum defluoridation capacity is achieved when the concentration of magnesium sulfate is 0.05 mol/L,the liquid-to-solid ratio is 8,and the calcination temperature is 350℃,resulting in the formation of active phases AlOOH and MgAl_(2)(OH)_(8) in the adsorbent.Using this layered magnesium-based active alumina adsorbent for fluoride removal from waste liquid,the best fluoride removal rate and equilibrium fluoride adsorption capacity are achieved at an adsorption time of 2.5 hours and a temperature of 70℃,reaching 70.70%and 8.36 mg/g,respectively.The adsorption process of fluoride ions in the wastewater follows the PSO model,indicating that the process involves a chemical reaction between the material on the surface of the magnesium-based active alumina adsorbent and the fluoride ions in the waste liquid.
作者
范茂盛
裴启飞
陆占清
杨坤
FAN Maosheng;PEI Qifei;LU Zhanqing;YANG Kun(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Chihong Zn&Ge CO.,LTD,Qujing 655011,Yunnan,China)
出处
《昆明理工大学学报（自然科学版）》
北大核心
2023年第6期1-7,共7页
Journal of Kunming University of Science and Technology(Natural Science)
基金
云南省重大专项项目(202202AB080005).
关键词
镁基活性氧化铝
改性活性氧化铝吸附剂
脱氟机理
脱氟动力学
magnesium-based activated alumina
modified activated alumina adsorbent
defluorination mechanism
defluorination kinetics
