Analysis Of Nonylphenol, Bisphenol A, Tetracycline And Oxytetracycline Their Removal By Potassium Ferrate In Environmental Water

Over the last decade, endocrine disrupting compounds (EDCs) and pharmaceutically active substances (PhACs) have been detected in drinking water, river, effluent and surface water. These compounds are a potential threat to aquatic ecosystems and human health because they are specifically designed to elicit biological effects, which have been more attentions in this day and age. Studies on EDCs and PhACs at present mainly focused on environmental investigation, toxicological study and establishment of estimate method. However, controlling and removal of EDCs and PhACs in environment water are short study. In this thesis endocrine disrupting compounds nonylphenol (NP) and bisphenol A (BPA) and pharmaceutically active substances tetracycline (TC) and oxytetracycline (OTC) are selected as the model pollutants. A sample and highly method was established for the separated determination of NP, BPA, TC and OTC from environmental water. And the efficiency and mechanism of potassium ferrate (â…¥) degradation the BPA and TC were systematically studied. This study provided valuable theoretical data and technical support to the practical removal EDCs and PhACs in environmental water.An analytical method based on solid phase extraction-high performance liquid chromatography-fluorescence detection (SPE-HPLC-FLD) has been established for the determination of NP and BPA in water. And TC and OTC had been detected by an analytical method of SPE-HPLC-DAD. A number of parameters that may affect the sensitivity and accuracy of the method were investigated. It is shown that the most efficiency mobile phase were eluted the compounds of nonylphenol and bisphenol A by a solvent mixture of acetonitrile-0.1% trifluoroacetic acid in water (70:30, V/V). Recoveries of the analytical method of NP and BPA ranged from 80% to 99% with RSD 0.07-1.6%. And a solvent mixture of acetonitrile-0.5% trifluoroacetic acid in water (90:10, V/V) as the eluting solvent was eluted tetracycline and oxytetracycline. Recoveries of the analytical method of TC and OTC ranged from 71.7% to 91.7% with RSD 2.6-4.2%.The methods were successfully applied to the determination of nonylphenol, bisphenol A, tetracycline and oxytetracycline in river, tap water and effluent.Ferrate(â…¥) emerging as an effective oxidant-disinfectant and coagulant of organic contaminants has shown promising results in water and wastewater treatment. But the studies were rare degraded the EDCs and PPCPs in water by ferrate(VI). This thesis describes an improved procedure for preparing potassium ferrate (â…¥) by which ferric nitrate was oxidized with potassium hypochlorite. The product of potassium ferrate (â…¥) was detected by Fourier transform infrared spectroscopy (FT-IR) and XRD spectra. Then these studies were researched in the lab condition, which were the behavior and mechanism of degradation of BPA, and removal of tetracycline by combination of photocatalysis and ferrate (â…¥). It is shown that the optimal pH for BPA degradation was 9.0, and at room temperature and a Fe (â…¥): BPA mass concentration ratio of 5:1, approximately 94% of the BPA was degraded after 5 min. The kinetics of the oxidation of bisphenol A by potassium ferrate (â…¥) was conformed to the second-order reaction. The effects for removal of tetracycline were studied in the different reaction systems of K2FeO4 (VI), K2FeO4 (VI)+UV, TiO2+UV and K2FeO4 (VI)+TiO2+UV. It was found that the reaction system of K2FeO4(â…¥)+UV is much better to removal of tetracycline. Approximately 93% of the TC was degraded after 60 min.The experiment showed potassium ferrate (â…¥)was a strong oxidant in the degradation of bisphenol A and tetracycline.