Preparation Of Nanoscale Zero Valent Iron And Its Application In Wastewater Treatment

This thesis was prepared nanoscale zero valent iron, activated carbon supported nanoscale zero valent iron, ordinary copper-iron and bimetallic copper bimetallic nano-iron. Then these materials were characterized by scanning electron microscopy(SEM) and X-ray diffraction(XRD) analysis. And four kinds of materials used in this study in wastewater, reached the following conclusions:Nano-iron relative to iron, ordinary iron concentration is more susceptible to degradation of Rhodamine B, not only can improve the removal of Rhodamine B, and can shorten the maximum degradation of Rhodamine B removal of reaction time. This result in a corresponding degradation of methyl orange conclusion is consistent with the experiment. Dosage of nanoscale zero valent iron, the initial concentration of Rhodamine B or methyl orange, temperature and pH are the main factors that affect its removal. Removal rate increases nanoscale zero valent iron after the first increased and then decreased, the reduced with increasing the initial concentration of the dye to increase, decrease with increasing temperature after the first rise, with increasing p H value decreased. In addition to exploring the best conditions nanoscale zero valent iron degradation of these two dyes, have reached more than 90% efficiency.Experimental Fe-Cu bimetallic denitrification ordinary Fe-Cu bimetallic nano, when the dosage is 0.6g, under mild conditions, the ordinary copper bimetallic iron within 200 min almost no removal of nitrate efficiency. The use of nano-iron-copper bimetallic degradation efficiency of nitrate within 200 min of almost 100%.DO, dosage nanometer Fe-Cu bimetallic, the initial concentration of nitrates in the dispersed state of nano-iron, pH value is the main factor affecting the nano Fe-Cu bimetallic denitrification, Greater concentration of dissolved oxygen is not conducive to the removal of nitrates; The initial concentration of the dosage of nano Fe-Cu bimetallic and nitrate is a shift in the relationship between them determine the relative amounts of nitrate removal; Better dispersion of nano-iron, the higher the corresponding nitrate removal, but the pH and nitrate removal rate was inversely related.Activated carbon nano-iron load compared with the same dosage of activated carbon, higher degradation efficiency of COD when nanoscale irons alone. Alone is probably using the same dosage of activated carbon and nano-iron total COD removal efficiency, This will not only greatly improve the removal, but if applied in practice will be very greatly reduced costs. As the load increases Nano activated carbon dosage of iron, COD removal rate gradually increased, but rises to a certain value, the increase is particularly slow, taking into account economic factors that determine the 0.1g for optimum dosage.From the experimental results of this study, the nanoscale zero valent iron experiments prepared was suitable to treat dyeing wastewater. Nano iron and copper bimetallic nitrate was suitable to degradation of wastewater treatment. The activated carbon load nano-iron had a remarkable removal for high organic content wastewater treatment.