硅藻土基锆吸附剂的制备、表征及性能研究

摘要

以氧氯化锆为改性剂，用共沉淀法制备硅藻土基锆吸附剂。考察了改性剂用量、固液比、改性时间及焙烧温度等制备条件的影响，探讨吸附剂投加量、pH值、时间、温度、废水的初始质量浓度对吸附性能的影响，并用XRD、FTIR对硅藻土基吸附剂进行了表征。结果表明，将钠化后的硅藻土按固液比1∶15(g/mL)与20 g/L氧氯化锆混合，共沉淀10 h，100℃下焙烧，此条件下制得的吸附剂除磷效果较好。在室温条件下，当硅藻土基吸附剂用量为0.3 g，吸附时间为90 min时，对废水中磷的吸附效果最佳，吸附较符合Langmuir等温模型。%This paper adopted coprecipitation method to prepare the zirconium adsorbent based on diatomite with zirconium oxychloride as modifier. The influence of preparation conditions on the dosage of modifier, solid-to-liquid ratio, modified time and calcination temperature was investigated. The influence of adsorption performance on the adsorbent dosage, pH value,time, temperature, initial concentration of wastewater was discussed. And the zirconium adsorbent based on diatomite were characterized by XRD and FTIR. The results showed that under the condition of Na-diatomite in the ratio of 1:15 mixing with 20 g/L zirconium oxychloride, modifying 10 h,100℃calcination with co-precipitation method, the adsorbent possesses higher removal rate for phosphorus. At room temperature, the zirconium adsorbent based on diatomite has good adsorption effect on phosphorus on the condition of 0.3 g of adsorbent, 90 min of adsorption time. The adsorption process corresponds with Langmuir isotherm adsorption.