Abstract:

Iron-substituted aluminophosphate molecular sieves (FeAPO-5) were synthesized by hydrothermal crystallization and characterized with XRD, SEM, FT-IR and UV-Vis techniques.The results showed that the synthesized samples had good crystallinity and uniform grain.From the obtained characterization results, it could be concluded that both the framework and extra-framework Fe species were together present in the FeAPO-5 samples, and most iron ion was incorporated into the AlPO4-5 framework.FeAPO-5 as a heterogeneous catalyst is effective for catalytic oxidation of phenol in aqueous solutions with H2O2 as oxidant.The best results (99.0% phenol conversion, 77.8% total organic carbon) after 240 min at 80℃ were obtained with phenol initial concentration 200 mg·L^-1, H₂O₂ initial concentration 1200 mg·L^-1 and pH5.0. Meanwhile, inductively coupled plasma (ICP) spectrometry results indicated that the concentration of leaching-off Fe³⁺ in the solution was very little and the FeAPO-5 molecular sieves was stable in the process of catalytic oxidation of phenol in aqueous solutions.

Key words:

FeAPO-5, 分子筛, 苯酚, 催化氧化

摘要： 以水热晶化法合成了铁磷铝分子筛FeAPO-5，并用XRD、SEM、FT-IR和 UV-vis等对分子筛样品进行了表征。结果表明，所合成的FeAPO-5分子筛样品结晶度高，晶粒大小均匀，FeAPO-5样品中存在骨架Fe和骨架外Fe物种，并以骨架Fe物种为主。FeAPO-5作为一种非均相催化剂能有效催化氧化水溶液中苯酚，在苯酚初始浓度200 mg•L-1 、H2O2初始含量1200 mg•L-1、pH 5.0及溶液温度80℃的条件下，处理240 min后苯酚去除率达99.0％，TOC去除率可达77.8％。ICP分析结果表明，催化剂上析出到溶液中的铁离子浓度很低，催化剂性能稳定。

关键词:

FeAPO-5, 分子筛, 苯酚, 催化氧化