Preparation Of Fe Matrix Composites And Its Application In The Treatment Of Dye Wastewater By Light Fenton

With the rapid development of science and technology and industry,we enjoy the convenience brought to us at the same time,environmental crisis is quietly approaching,among which the destruction of water resources has been the first to become one of the world’s most severe problems,industrial wastewater as one of the main sources of water pollution,is also the most difficult to treat.A lot of factories produce organic pollutants and industrial chemicals,pesticides,dyes,such as discharge into the natural water,even under the condition of lower concentrations are very harmful,these colored wastewater contains many biological refractory organic compounds,a serious threat to human health and aquatic environment,the development of new technology to deal with water pollution also appears imminent.Fenton process as advanced oxidation process（AOPs）is widely used to treat various persistent,non-biodegradable pollutants.These processes are relatively low-cost and are expected to run in parallel with other oxidation processes.However,traditional homogeneous Fenton catalysts based on iron or iron salts have many disadvantages.Specifically,they produce large amounts of iron sludge as a by-product of treatment,have a narrow and low pH range and have iron complexing agents such as phosphate ions that inactivate iron.To overcome these shortcomings,heterogeneous Fenton catalysts have recently received a great deal of attention.In the presence of light,ions are rapidly converted to iron ions,which can react with hydrogen peroxide to form more hydroxyl radicals.The use of natural sunlight reduces the operating costs associated with processes with unnatural light sources.In this study,Fe and Ni bimetallic catalysts supported by alumina were synthesized by wet impregnation method and used for the degradation of rhodamine B as heterogeneous photofenton catalysts for the first time.The synthetic pathway conforms to the concept of green chemistry and is simple,cheap and pollution-free.The morphology,structure and optical properties of the catalyst were analyzed by scanning electron microscopy,INFRARED spectroscopy and UV-vis spectroscopy,and the activity of the catalyst was determined under light.The effects of pH,catalyst dosage,hydrogen peroxide dosage and dye concentration on degradation were investigated.Under the optimal pH value（pH=3）,the amount of hydrogen peroxide 1 mL（10 mM）and the amount of catalyst(1 g·L^-1),the removal efficiency of rhodamine B(50 mg·L^-1)was 98.70%within 120 min.Compared with pure alumina,greatly increased the activity of the catalyst,hydrogen peroxide,also greatly promote the reaction,increase the light fenton reaction activity sites,and combine with iron ion in light active substances hydroxyl free radicals,light can also generate additional hydroxyl free radicals,and promote the ferrous ion and iron ion circulation.In addition,it was determined that the catalyst could show good stability in continuous experiments under light.