| The scarcity of fresh water resources makes people focus on water pollution.The stench of the Niafara Falls water plant caused by organic pollution,the odor problem of water quality has become the focus of people's attention.As we all know,the safety of drinking water is closely related to human health.It is very crucial for environmental workers to find an economic and effective way to remove the peculiar smell in water.Before that,algae was considered to be the main cause of odor problems.Some studies have proved that Halophenols,another kind of pollutants in the pipe network,often appear.Halophenols are toxic substances,which have endocrine disrupting effects in the environment.Their refractory characteristics also make Halophenols inefficient in the treatment of drinking water in China.There are enough data to prove that the hydrogen peroxide system activated by bicarbonate has remarkable application performance in wastewater.It is found that the bicarbonate radical produced by bicarbonate can be used as a single electron oxidant with obvious advantages,through hydrogen extraction reaction and electron transfer,and metal ions can be used as homogeneous catalyst.EPR results show that superoxide radicals are the main products of DMPO capture,which may occur in the internal coordination field of metal ions.Bicarbonate with low cost,high solubility and relatively non-toxic is a green wastewater treatment solution for sustainable development in the future.The activation of hydrogen peroxide system by sodium bicarbonate catalyzed by metal ions can greatly improve the reaction rate.According to the nucleophilic properties of superoxide radicals in hydrogen peroxide system activated by sodium bicarbonate,we conclude that the system can realize the simultaneous degradation and dehalogenation of Halophenols.In this project,hydrogen peroxide activated by bicarbonate catalyzed by metal ions was used to remove Halophenols in water.Firstly,the metal ion catalysis BAP system was established.The experimental results show that divalent cobalt ion is suitable for catalysis BAP system.It can degrade Halophenols represented by fluorophenols,chlorophenols and bromophenols.The degradation effect is much better than that of Ba P system,hydrogen peroxide and cobalt ion Fenton system.The degradation efficiency of fluorophenol was higher than that of Chlorophenol and bromophenol,and that of interposition was higher than that of ortho was higher than that of para.In the experiment,fluorophenols were further explored.EPR and free radical quenching experiments were used to determine that the system can produce hydroxyl radicals and superoxide radicals at the same time.The experimental results were compared,which showed that superoxide radicals play a more central role in the system.The dehalogenation efficiency of Halophenols organic compounds was calculated by combining ion chromatography with liquid chromatography.The full scan in liquid mass spectrometry was used Combined with the pre ion scanning mode,the possible dehalogenated and halogenated products were inferred,and then the reaction mechanism was determined.Determine the application of the subject in actual water,explore the effects of background ions,humic acid,mass transfer efficiency and other factors on the degradation of halogenated phenolic organic compounds in the BAP system catalyzed by divalent cobalt ions;change reactants,target pollutants,catalysts Concentration,explore its effect on the degradation rate of the system;choose Songhua River water,effluent from the secondary sedimentation tank,tap water to simulate the degradation of the system in the actual water body,the results show that the water substances such as chloride ions on the divalent cobalt ion catalyze the degradation of halogenated phenols in the BAP system Organic compounds have a certain inhibitory effect;the reaction parameters are optimized,and the suitable dosing point of the system is determined.The results show that this subject has good practical application prospects. |
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