Calcined-β-CD-Fe-LDHs对副品红溶液的水处理及动力学的研究

Study on the Removal and Kinetics of Parafuchsin from Aqueous Solution by calcined-β-CD-Fe-LDHs

摘要:

该文采用低饱和态共沉淀法，辅助微波手段快速制备了β-环糊精插层含Fe水滑石(β-CD-Fe-LDHs)。利用IR和SEM对β-CD-Fe-LDHs和煅烧产物calcined-β-CD-Fe-LDHs进行了结构和形貌表征，β-CD-Fe-LDHs具有片状水滑石的晶体结构，其煅烧产物粒子大小均匀。将calcined-β-CD-Fe-LDHs应用于副品红溶液的水处理，探讨了不同光催化剂、反应温度、副品红溶液质量浓度以及使用寿命等条件对其去除性能的影响。结果显示，在最佳条件下，对50 mg/L 的副品红溶液的去除率可达到95.70%，且重复使用5次后去除率仍可达到79.99%。其动力学研究表明，前40 min内在不同的calcined-β-CD-Fe-LDHs质量浓度和不同副品红溶液初始质量浓度等条件下均符合一级反应动力学规律。calcined-β-CD-Fe-LDHs 可作为一种新型有效的光催化剂应用于副品红溶液的水处理中。

Abstract:

In this article, β-cyclodextrin (β-CD) intercalated ferrum-containing hydrotalcite was fleetly prepared by the technology of the microwave-crystallization and low saturated state of coprecipitation. The purposed sample of β-CD-Fe-LDHs and calcined-β-CD-Fe-LDHs were characterized by XRD, IR and SEM. The results show that the synthesized β-CD-Fe-LDHs with the flexible slice have the structure of LDHs. The calcined product is uniform particle state. Calcined-β-CD-Fe-LDHs was then applied to the removal of parafuchsin. The effects of photocatalyst types, the reaction temperature, parafuchsin mass concentration and cycle life on the parafuchsin removal were investigated. It is shown the percentage of removal for parafuchsin solution of 50 mg/L can reach 95.70% under the optimum conditions, and the removal rate can reach 79.99% even after 5 cycles. The kinetics cuvres of removal show that the removal is first-order kinetics model before 40 minutes under different photocatalyst mass concentrations and parafuchsin mass concentrations. The results suggest that calcined-β-CD-Fe-LDHs can be used as a novel and efficient photocatalyst for the removal of parafuchsin.