The Effects Of Silicate On O-nitrophenol Reductive Transformation By Adsorbed Fe （Ⅱ） Inγ-Al₂O₃Suspensions

The average content of iron in the Earth’s crust is5.6%, which is ranked second in abundance in the earth’s crust metal. As the adsorbed Fe (Ⅱ) having a lower redox potential, they had a strong chemical reduction ability of pollutants degradation in environment. However, the soil environment is a complex system which including various adsorptive carriers such as Al2O3, TiO2, FeOOH and other minerals; adsorbable material such as silicates, phosphates, DOM, heavy metals, organic pollutants; therefore create a simple model system, explore Fe (Ⅱ) adsorption and its influencing factors, had important environmental implications of nature environmental Fe cycle and pollutants degradation. This study selected Y-Al2O3interface, explore Fe (Ⅱ) and silicate Adsorption on Y-Al2O3interface, and the effects of Y-Al2O3interfacial adsorption of silicate of Fe (Ⅱ). The results showed:with increasing pH, the adsorption of Fe (Ⅱ) and the Y-Al2O3silicate interface increases; pH6.9under conditions of silicate added to the system leads to Fe (Ⅱ) in the Y-Al2O3interface reduce the amount of adsorption.This study selected y-Al2O3as interface, explore Fe (Ⅱ) and silicate adsorption on y-Al2O3interface, and the effects of silicate on y-Al2O3interfacial adsoiption of Fe (Ⅱ). The results showed that with increasing pH, the adsorptionl amount of Fe (Ⅱ) and silicate on the y-Al2O3interface increased, respectively; Under the condition of pH6.9, the added silicate reduced the amount of adsorpted Fe (Ⅱ) in the y-Al2O3interface.Based on the adsorption study, we explored the effect of silicate on the kinetics of adsorbed Fe (II) reduction of organic pollutants. This study selected nitrophenol (2-NP) as a probe organic pollutants, Fe (II) as a reducing agent in the non-ferrous minerals Y-Al2O3interface to explore the impact of silicate on2-NP degradation. Results indicated that:Under conditions of pH6.9, silicate added to the system reduced the adsorption density of Fe (II) on Y-Al2O3interface, the reduction potential shifted activation energy increases, eventually slowed down the rate of2-NP reduction transformation in Y-Al2O3interface.