XMn₂O₄Nano Materials And The Application In The Hydrogen Production And Wastewater Biological Treatment Coupling System

Photocatalytic water splitting by semiconductors achieved conveting solar energyinto hydrogen, and it is one of the effective methods in resolving energy crisis andenvironment problem. In this thesis, under the guidance of the photocatalytic mechanismand effect of the sacrifice reagent in photocatalytic process. Mn2O3, LiMn2O4, CoMn2O4and ZnMn2O4four light catalyst were prepared by electrostatic spinning, andphotocatalytic hydrogen production and wastewater biological treatment coupling systemwas founded.The main results were as follows:1. Mn2O3, LiMn2O4, CoMn2O4and ZnMn2O4four catalysts were prepared by thecombing sol-gel process and the electrospinning technique, using polyvinyl pyrrolidone(PVP) and several of inorganic salts as the precursor, and their components andmorphologies were analyzed and characterized，and photocatalytic hydrogen productiontest were investigated under visible light. The testing results show that: when thecalcination temperature is500℃，photocatalyst had the highest light activity.2. A positive displacement of0.9L experiments simple EGSB reactor was desighedfor processing analog sulfate wastewater. Sodium lactate as carbon source and sodiumsulfate as the sulfur source, the reactor temperature was maintained at35℃, influent pH6.1to6.6，the organic load of1.42to5.69g.(L.d)-1, sulfate load was1.42g.(L.d)-1,from COD/SO42-=1:1, and HRT=0.9d to start the reactor.Under running conditionschange after the parameters COD/SO42-for2:1,3:1,4:1and95d each test run35dcomparative analysis S2-generation and waste water treatment effect，COD/SO42-=3:1are the best, so COD/SO42-=3:1the change different hydraulic retention time (HRT) to0.9d,0.6d,0.3d,0.1d. When HRT is large, the effluent concentration of sulfur ions withCOD/SO42-increasing; when HRT small, the effluent sulfide ion concentrationCOD/SO42-impact.3. Studying on the depletion of sacrifice reagent， it was found that low sacrificereagent concentration(<100mg.L-1)lead to high photocatalytic hydrogen production activity. The S2-concentration of the effluent was low，and it could be used to be sacrificereagent effectively. The study supporting of the coupling system of photocatalytichydrogen production and wastewater biological treatment.4. The performance of the four kinds of hydrogen-producing catalyst in the system,and of sulfur ion concentration on the performance of hydrogen production research,found that under the conditions of the system, the catalyst for the LiMn2O4hydrogenproduction activity of the highest reach109.4μmol. Mn2O3,ZnMn2O4and CoMn2O4hydrogen production activity in turn reduces, respectively36.5μmol,18.2μmol and10.3μmol.5. Coupled the EGSB reactor with the photocatalytic reactor, hydrogen productionand wastewater treatment coupling system was started up. The result of the experimentproved that, this dual bed system had the capability of hydrogen production andwastewater treatment. In the system, the bioreactor not only ruduced COD, but also actedas the regenerator of sacrificial reagent.Through experiments and research in this paper, the establishment of the anaerobicbioreactor treatment of organic wastewater containing high concentrations of sulfate, theinitial idea of photocatalytic hydrogen production and wastewater biological treatmentcoupling system under sulfur cycle.