Experimental Research On The Enhanced Wastewater Treatment Performance And Energy Utilization In The Rotating Disk Photocatalytic Fuel Cell

With the deterioration of environmental pollution and the exhaustion of fossil energy,human beings are now facing great development challenges,and it is urgent to change the current situation of environment and energy.Photocatalytic Fuel Cell?PFC?technology,a wastewater treatment,which converts the sun light energy and chemical energy into electrical energy,has gained more and more attention.However,PFC has a wide range of problems,such as low light energy utilization rate,poor substrate mass transfer process,and high internal resistance for mass transmission,which limited the further development of PFC.To solve the above problems,the PFC system of the rotating disk electrode is constructed by using the rotating disk electrode structure.The main results are summarized as follows:?1?A TiO₂/Pt PFC system with rotating plate electrode was constructed to improve the Cl^-utilization producted by the chlorophene?4-cp?degradation process in the anode,and realize the co-degradation of 4-cp and ammonia nitrogen?NH₄⁺?in wastewater.The experimental results showed that when 4-cp and NH₄⁺wastewater were degraded separately,the degradation efficiency of 4-cp was the same while that of NH₄⁺wastewater was increased by 65%,indicating that 4-cp and NH₄⁺could promote the co-degradation.The mechanism of co-degradation of 4-cp and NH₄⁺by the rotating plate PFC system was revealed through the quantification experiment of Cl^-concentration in the process of 4-cp degradation and the degradation experiment of NH₄⁺before and after the addition of Cl^-.?2?The PFC-Fenton coupling system of bamboo charcoal cathode with rotating plates was constructed,which increased the production and H₂O₂ utilization efficiency in PFC cathode and realized the low cost and efficient degradation of sewage.The results showed that the degradation efficiency of methyl orange was increased by 50%in the PFC-Fenton system compared with the traditional platinum cathode.The main reason was that the transfer of oxygen was enhanced by the rotating at the cathode.Meanwhile,compared with platinum electrode,the yield of H₂O₂ in bamboo charcoal catalyst increases by 100%,which greatly improveed the Fenton reaction.In addition,the mechanism of degradation of methyl orange wastewater by bamboo carbon cathode PFC-Fenton coupling system was further clarified by H₂O₂ quantification experiment and active radical capture experiments.?3?The multi-cathode bamboo charcoal cathode PFC system was constructed to enhance the electron and substrate transmission and realize the efficient recovery of energy in wastewater by PFC.The experimental results showed that the short-circuit current of the multi-cathode PFC system increased by 40%and the maximum output power increased by 57%with the same catalyst load of bamboo charcoal.Meanwhile,the degradation efficiency of multi-cathode PFC system was also improved.By means of linear voltammetry,cyclic voltammetry and ac impedance spectroscopy,it was demonstrated that the structure of bamboo charcoal with multi-rotating plates effectively increased the catalytic activity,increased the effective active area and reduced the internal resistance of bamboo charcoal.