Water/sand Environmental Decontamination Using Photocatalytic Fuel Cells And Photoelectrocatalysis-microbial Fuel Cells

Environment pollution and energy consumption are the focus of the world nowadays.The two problems interplay in pollution control intensively due to high energy consumptions during remediation,with industrial production and rapid urbanization,a large variety of pollutants were discharged into environment,which caused threats to the whole ecosystem and public health.Land is indispensable in ecology and environment,its pollution prevention and decontaminations have attracted intensive attention.To decontaminate sites of pollutants,Photocatalytic fuel cell and bio electrochemical fuel cell reactors,can degrade pollutants and generate electricity,potentially decrease cost,energy consumptions and treatment cycle,attracted wide attentions.In this study,using Photocatalytic fuel cell?PFC?or PEC-MFC?integrated photo-electro-catalysis and microbial fuel cell?,decontaminating sand/water of RhB,tetracycline and heavy metal ions pollutants was investigated,the following results are obtained.?1?Preparation and characterization of catalytic electrodes:RGO/MnO₂,ZnIn₂S₄,Ag/AgCl/GO catalytic electrodes were prepared,various characterization methods were used to analyze their performance,SEM/EDS analysis showed that the catalysts loaded uniformly,UV-Vis spectra showed that the catalytic electrodes have both absorption of ultraviolet and visible light,CV curves showed their good performance of electron transfer.Through photocatalytic degradation experiments,the research shows that their catalytic performance is greatly related to the pH of solution,concentration of dissolved oxygen and electrolyte in solution.?2?The constructionof photocatalytic fuel cells and its performance:Photocatalytic fuel cell was constructed using the prepared catalytic electrodes,which combined the effects of photocatalysis and electro-catalysis.The factors affecting the catalytic degradation of rhodamine B in aqueous solution are discussed.The results show that under aeration condition,the degradation rate increased with the decreased external resistance,and stronger light is beneficial to increase the rate of pollutant degradation,degradation rate can be further improved by adding NaHSO₃ to the solution.have been producing,the production of electricity had also increased.?3?Novelty restoration system of sand/water by photocatalytic fuel cell:By introducing photocatalytic fuel cell into sand/water restoration,the visible light responsed photocatalytic remediation system of sand and water were constructed to degrade rhodamine B and tetracycline.Results showed that the RhB content in sand reduced with its degradation in aqueous solution,cyclodextrin promote the migration of pollutants from sand into the water,and the addition of KMnO₄/NaHSO₃ accelerated the degradation of pollutants,the water purification and sand remediation were realized simultaneously.?4?Catalytic electrode coupled Microbial fuel cell restoration systems:To further increase the remediation of polluted sand and water,the system was constructed for remove different types of pollutants.Due to synergistic effects of photoelectric catalysis,the exoelectrogen and the mass-transfer by diffusion,Cr?VI?and rhodamine B of sand could be decreased to a lower level in a several hours,significantly shortened the remediation time.