Preparation Of Intercalative Bentonite Composite Material And Its Application In Wasterwater

In this paper,according to the good adsorption and ion exchange properties of bentonite itself,this paper separates Fe₃O₄ from Fe₃O₄,which is characterized by the fact that the traditional adsorbent and oxidant treatment of traditional high-heavy metal ions,high organic content and so on.The addition of Fe₃O₄-CTAB-MMT and Fe₃O₄-C-MMT complex water treatment agent,and the addition of hydroxyl radical-containing oxidants,the synthesis of "oxidation-adsorption-separation" in one with a layered structure Magnetic Fenton agents,and were applied to heavy metal Cr?VI?and phenol wastewater treatment.Specific research is as follows:1.Fe₃O₄-CTAB-MMT was prepared by Fe₃O₄ and CTAB modified bentonite.The XRD,FT-IR,TEM and SEM were used to characterize the Fe₃O₄-CTAB-MMT.The Fe₃O₄ particles prepared by solvothermal method Fe₃O₄ particles are mainly attached to the surface of bentonite,CTAB is successfully inserted into the bentonite lamellar structure.When the ratio of Fe₃O₄ is 10%,the d001 crystal of Fe₃O₄-CTAB-MMT is formed in the form of fine crystal structure,The interlayer spacing of the surface reaches a maximum of 1.66 nm.2.The effects of the addition of Fe₃O₄-CTAB-MMT,the initial pH of solution,the initial concentration of Cr?VI?solution,reaction time and reaction temperature on the adsorption of Cr?VI?in Fe₃O₄-CTAB-MMT were investigated.The results show that when the reaction temperature is 70? and the pH value is 2,the addition of Fe₃O₄-CTAB-MMT is the concentration of 20 mg,which is the initial concentration of 100 mg/L Cr?VI?,the reaction time is 2 h,the adsorption rate is more than 95%.The adsorption kinetics of Cr?VI?on Fe₃O₄-CTAB-MMT is in accordance with the pseudo-second order kinetic model,indicating that the reaction process is mainly controlled by chemical action;Fe₃O₄-CTAB-MMT is selective for the adsorption of Cr?VI?.The common coexisting ions have no obvious effect on the removal rate of Cr?VI?.The removal rate of Cr?VI?after 5 times of Fe₃O₄-CTAB-MMT Still more than 90%,with recycling value.3.Fe₃O₄-C-MMT was prepared by high temperature carbonation treatment at a vacuum of less than 133 Pa.The structure was analyzed by XRD,Raman,FT-IR,SEM,TEM and BET.The results show that Fe₃O₄-C-MMT has a good crystallinity graphene-like structure,and the ID/IG is about 0.7,which proves that it has a high degree of graphitization.Fe₃O₄-C-MMT surface area and pore volume of 28.85 m2/g and 0.0945 cm3/g,respectively,greatly improve the adsorption capacity.4.The effect of Fe₃O₄-C-MMT/H2O2 Fenton system on the catalytic degradation of phenol was studied.The effects of Fe₃O₄-C-MMT addition,H₂O₂ addition,solution pH and temperature on the degradation process were investigated.The Fe₃O₄-C-MMT/H₂O₂ Fenton system has a good synergistic effect on the catalytic degradation of phenol.Fe₃O₄-C-MMT adsorption and Fenton oxidation play a synergistic effect.Fe₃O₄-C-MMT and H₂O₂ have obvious synergistic effect Fe₃O₄-C-MMT/H₂O₂ Fenton system is better than the single system.Fe₃O₄-C-MMT can provide a stable iron source for Fenton reaction,and it is beneficial to the magnetic recovery after solid-liquid separation.After 5 times,the removal rate was still 87.64%,and the dissolution rate of iron ions was only4.17×10-3 mg/L after 60 min reaction,which proved that it had good industrial application prospect.