Preparation And Catalytic Property Of Supported Iron Bamboo Charcoal Heterogeneous Fenton Catalysts

Traditional homogeneous Fenton oxidation system has a strict requirement of low pH,need to add large amounts of acidic substances and iron. After completion of the reaction, itproduces large amounts of iron sludge, resulting in a secondary pollution. These shortcomingshinder Fenton technology the further application and development. Homogeneous Fenton hassome limitations, therefore heterogeneous Fenton is paid more attention by researchers.In this paper, we prepared the supported iron bamboo charcoal heterogeneous Fentoncatalysts by repeated cooking method, and optimized the catalyst preparation conditions,investigated catalytic property of supported iron bamboo charcoal heterogeneous Fentoncatalysts, then took the dynamic experiment. The final results of our study could providetheoretical and operational guidance for turning experiment to practical applications.We established heterogeneous Fenton reaction system. For heterogeneous Fenton formedof catalysts and H2O2, Almost all of the phenol was oxidized, removal rate of TOC was48.02%at150min, when the initial mass concentration of phenol was500mg/L, and it was higher thanthe two simple sum of only the catalyst and only hydrogen peroxide. Through experimentalstudy, the best catalyst preparation conditions were as follows: soak stage, the concentration ofFeCl3was0.5mol/L, the soaking time was12h; Calcination stage, the calcination temperaturewas300℃, the calcination time was2h.Phenol wastewater for the study, we investigated the influencing factors in theheterogeneous Fenton reaction, the results showed that when the catalyst dosage was6g/L, theamount of hydrogen peroxide used was180mM, the oscillation frequency was150r/min, thereaction time was2.5h, and do not adjust the pH, the treatment of phenol wastewater was thebest, the removal rate of phenol reached99.73%and51.53%removal rate of TOC wereobtained. Investigation results about pH showed that pH range of reaction was expanded inheterogeneous Fenton reaction system.In each repeated run, the treatment of phenol wastewater was little worse, but maintained agood level, indicating the catalyst was still active in the reaction process. And the dissolution ofiron was only below0.768%of total iron, showing the catalyst had good stability during thereaction, and the reaction would not produce large amounts of iron sludge.On the basis of the static studies, we designed fixed-bed reactor and built heterogeneousFenton fixed bed reactor system to study the effects of the residence time of the wastewatertreatment efficiency. The results showed that: the residence time was too short, theheterogeneous Fenton system for wastewater treatment was not complete. When the reactionresidence time of an hour, the treatment of phenol wastewater was best, the removal rate ofphenol reached99.41%and43.89%removal rate of TOC were obtained. As a catalyst in the actual production applications to improve the theoretical basis and guidance.