Study On Sorption Behavior Of Four Kinds Of Environmental Hormones On Marine Sediment

Adsorption behavior of Environmental Hormones has become one of the important directions of environmental chemistry at present. In response to the serious coexisting pollution of environment, it is interested to understand and evaluate the sorption behaviors of organic pollutants on soils/sediments, and to control the sorption behaviors. In this dissertation, the sorption behaviors and mechanisms of organic pollutants by coexisting pollution onto marine sediments were investigated detailedly. The main conclusions of this dissertation are:1. The sorption behaviors of E2, BPA, DBP, E1 on marine sediments are first investigated through batch adsorption experiment, and environmental factors (salinity, dissolved organic matter, acidity and temperature) which could affect the sorption behaviors of EHs are also examined. The adsorption behaviors of E1, E2 and BPA to all marine sediments are fitted with Freundlich model. The adsorption behaviors of DBP on H2O2-treatment sediments are fitted with Freundlich model, but on HCl-treatment and H2O-treatment sediments are fitted with Linear model. Organic carbon content of sediments plays a major role in adsorption of E1, E2 and DBP on HCl-treatment and H2O-treatment sediments. And Clay materials and surface structure of sediments play major roles on H2O2-treatment. Adsorption behaviors of BPA on all sediment mainly related with clay materials and surface structure of sediments.2. Increasing salinity is beneficial to the adsorption of E2, BPA, DBP and E1; Adsorption capacity of E1, E2 and DBP decreases with dissolved organic matter; With pH value increasing, adsorption capacity of E1, E2 and BPA decreases, and it of DBP first increases and then decreases; The thermodynamic functions of Gibbs free energy (ΔGθ<0), enthalpy (ΔHθ<0) and entropy (ΔSθ<0) terms are determined, indicating that the sorption is a spontaneous and exothermic process which accompanied with a decrease in the degree of freedom.3. Adsorption isotherms of Tween80, CTAB and SDBS are well fitted with Linear model and the adsorption behavior predominantly relate with the organic carbon contents of sediments on HCl-treatment and H2O-treatment sediments. In addition, Freundlich model fits the adsorption isotherms and clay minerals and surface areas of sediments played dominant roles in the adsorption of E2 on H2O2-treatment sediments.4. Adsorption isotherms of p-nirtoaniline are well fitted with Freundlich model and the adsorption behavior predominantly relate with the organic carbon contents of sediments on HCl-treatment and H2O-treatment sediments. In addition, clay minerals and surface areas of sediments played dominant roles in the adsorption of E2 on H2O2-treatment sediments.5. The adsorption equilibrium time of E2, BPA, DBP and E1 was respectively reduced to 4h,2h,2h and 4h with addition of CTAB, Tween80 and SDBS. Addition of surfactant, adsorption isotherms of E1 and E2 are also well fitted with Freundlich model; Adsorption isotherms of DBP and BPA are well fitted with Linear model. The presence of CTAB or Tween80 could enhance the sorption capacity of EHs on marine sediments. In contrast, the presence of SDBS inhibited the sorption capacity of EHs.6. Increasing pH, the adsorption capacities of E2, BPA, DBP and E1 moderately change with addition of CTAB. The presence of CTAB inhibits the effect of pH. Addition of Tween80 only changes the adsorption amount of EHs. SDBS can lead to synergistic effect which results in adsorption capacities of EHs sharply decreasing as the solution PH increase.7. The adsorption equilibrium time of E2, BPA, DBP and E1 was respectively reduced to 20h,3h (no change),3.5h and 20h with addition of p-nirtoaniline. Addition of p-nirtoaniline, adsorption isotherms of E1, BPA and E2 are also well fitted with Freundlich model; Adsorption isotherms of DBP are also well fitted with Linear model. The presence of p-nirtoaniline sharply inhibited the sorption capacity of E1, E2 and DBP. But nearly affect the adsorption behaviors of BPA. Competitive effect plays an important role in adsorption behaviors of E1, BPA and E2 with p-nirtoaniline. However, solubility increasing decreases the adsorption capacity of DBP with addition of p-nirtoaniline.