The Application Of Fe₃O₄ MNPs In The Phenolic Wastewater Treatment And Phenolic Biosensors

As the simplest phenolic compound,phenol is mainly used to compound phenol-aldehyde resin,bisphenol A,caprolactam,alkylphenol,salicylic acid and so on.Because phenol is the most important basic synthetic material of organism,many of its down-stream products related to many domains and had an extensive use in the industry.Phenolic compound had high toxicity.Effluent with phenol without processing would have serious damages to the environment and potential deleterious effects on human.The traditional treatments of effluent with phenol like adsorption,extraction,chemical oxidation,activated sludge and so on which all had many limitations.How to recycle the extraction and chemical oxidation,and dispose the left sludge remained to be problems.Although the current detection method of phenol was mature,but the traditional detection equipments were complex,expensive and big to do the field survey.Based on the above problems,we used the experiences of the former researchers,adopted the Fe₃O₄ Magnetic Nanoparticles which had Fenton-like activity to treat the effluent with phenol and the equipment of phenol sensor.The results turned to be satisfied which performed as follows in three aspects:?1?The study of Fe₃O₄ MNPs catalyze H2O2 to oxidative degradation of phenolThe prepared Fe₃O₄ MNPs as the catalyst was used to catalyze H2O2 oxidation phenol,in order to simulate the bio-safety disposal of effluent with phenol.To achieve the best reaction condition,the experiment optimized the pH value,catalyst quantity,oxidant concentration and response time.The results showed that Fe₃O₄ MNPs was high-performance catalyst w-hich eco-friendly and photocatalysis property.When pH=3.0,the catalyst quantity was 2 g/L and the mass ration of COD and H2O2 was 1:2 which was the best condition,3-hour reaction time would realize the remove of 100%phenol and 94.19%of COD.This would reach the swage discharge standard of the government and the total reactions meet the firs-order reaction.The catalyst would recycle with magnetic separation.?2?The sewage treatment with DL-Hydroxyphenyl HydantoinThe new electrochemical reactor which was made of braize and iron processed pre-treatment to the sewage with DL-Hydroxyphenyl Hydantoin.With the help of Fe₃O₄ MNPs catalyze the oxidation residue of H2O2 would realize the third-order standard of sewage discharge.When the electrochemical reactor was out of control,the braize could be the fuel and there was no need to regenerate.Fe₃O₄ MNPs could separate with magnetic.?3?The phenol sensor based on Fe₃O₄ MNPs-CNTsBased on the Fe₃O₄ MNPs-CNTs catalyze H2O2 to be Hydroxyl Radicals would quickly oxidize the phenol and magnify the oxidation signal and turned to be a kind of phenol sensor?Fe₃O₄ MNPs-CNTs/MCPE?which was used to detect the content of phenol in liquor.The results showed that the regression equation of phenol sensor was Y=0.651X+1.705,the correlation was R=0.996,the linear range was 1×10-6?1×10-4 mol/L and the detection limit was 1.81×10-7 mol/L.The phenol sensor showed highly specific under the interference detection of inorganics,organics and derivatives concentrations decuple phenol.The repeated use of sensor showed no electricity attenuation which proved highly stability.