Experimental Study On The Preparation Of Compounded Mesoporous Adsorbents And The Turification Of Groundwater Containing Arsenate And Fluoride

Arsenate and fluoride in the groundwater is harmful to health of human body. Adsorption is a good choice of many water treatment technology. However, most of the adsorbent has slow shortcomings, such as low adsorption capacity and slow adsorption. Therefore, research and development the efficient and environmental adsorbent has become a hot problem in the study on adsorption.Through uniform design to determine the best adsorption for F- adsorption effect of PEG-Ti, the ratio of PEG1.5980 g, water 5.0m L, p H value of 2.8. For the best adsorbent for AsO₄^3- adsorption of PEG-Zr, ratio of PEG-20003.9428 g, TMAOH 5.2m L, p H value 8. The optimum sintering temperature of 500 ℃. By doping rare earth elements, and ultimately selected composite mesoporous adsorbents. The best adsorbent for the adsorption of F- is Ti-Ce, saturated capacity of 49.01mg/g; the best adsorbent for the adsorption of As O43- is Zr-La, saturated capacity of 35.65mg/g. And XRD、BET、TEM results of the screened sorbent showed that the crystalline material is good, and arranged in an orderly mesoporous pore size based on 10-20 nm, with good mesoporous structure and physicochemical properties.Using Langmuir, Freundlich and Redlich-Peterson isotherm model to fitting target ion of isothermal adsorption test data. The results showed that the composite mesoporous adsorbents for adsorption of target ions is mainly chemical adsorption, but not over an ideal uniform of monolayer adsorption. Neutral environment is the highest adsorption efficiency when adsorbent target ion adsorption; hardness and Clconcentration will not have a greater impact absorption effect; sulfate concentration had a significant effect on the F- adsorption capacity; coexistence of arsenic and fluoride, adsorption efficiency to arsenate went lower.Homemade dynamic adsorption device.For Ti-Ce adsorbent determining the dynamic adsorption parameters of the device in the experimental range: packing height 30 cm, flow rate of 20.0m L/min. A coal mine water with the F- concentration of 9.7mg/L, AsO₄^3- concentration of 0.71mg/L. Take it as the research object, let mine water through the device which full of mixing two adsorbents. At depletion point（effluent concentration of inlet concentration of 95%）,the F-, AsO₄^3- equilibrium adsorption capacity was 34.9mg/g, 20.7mg/g.The experiments showed that adsorption and regeneration properties of the composite mesoporous adsorbents are good, and provide a good choice for arsenic, fluorine contaminant removal.