Preparation Of Iron-containing Hydrotalcite Composite Material And Its Fenton-like Degradation Properties

In recent years,the increasingly serious water pollution problem has greatly affected human daily life and physical health,so it is urgent to effectively deal with organic pollutants in water.At present,common printing and dyeing wastewater treatment methods include adsorption and catalytic degradation.The materials of the adsorption method are readily available,the production process is simple,and the catalytic degradation is environmentally friendly.Both methods are widely used.Layered Double Hydroxide(LDHs)is also called hydrotalcite compound.The body is generally composed of two or three metal hydroxides with a layered material and a special structure,It has basic and interlayer anions.Exchangeability,thermal stability,memory effect,tunability and other properties.LDH's excellent physical and chemical properties make it widely used in the environmental field,especially as an adsorption material for water pollution and air pollution.Iron-containing hydrotalcite has not only adsorption performance but also Fenton-like performance,so it can effectively degrade the dye while adsorbing organic dyes when treating dye wastewater.This thesis focuses on the development and preparation of iron-containing hydrotalcite and its composite materials for organic pollutants.It is used for the degradation of organic pollutants,and the composite materials formed have the adsorption and Fenton-like properties of iron-containing hydrotalcite,as well as other components of composite materials.The photocatalytic and oxygen-enhancing properties effectively improve the efficiency of ferrous hydrotalcite in degrading organic pollutants.The main research contents are summarized as follows:1?Co-precipitation method was used to prepare Mg Fe-LDHs containing different ratios of Mg and Fe,and the prepared Mg Fe-LDHs was characterized by XRD,FTIR and TEM.Using Methylene Blue(MB)as a model pollutant,investigate the Fenton-like degradation effect of Mg Fe-LDHs on MB solutions with different compositions,find the best degradation performance of Mg Fe-LDHs,and explore the different conditions(MB concentration,H₂O₂concentration,LDHs dosage,pH,etc.)degradation performance,select the best degradation conditions.When Mg Fe-LDHs and hydrogen peroxide(H₂O₂)coexist,the addition of a small amount of GSH can significantly promote the degradation and degradation of methylene blue,and obtain the relationship between the concentration of GSH and the reduction of MB degradation UV absorption value.Based on this,we constructed a highly sensitive GSH colorimetric detection sensor.Under the best experimental conditions,?A and GSH concentrations have a good linear relationship,and GSH can be quantitatively analyzed.When the concentration of GSH is 2.5 mg/L?25 mg/L,the linear regression equation is?A=0.0258C+0.1387(C is the concentration of GSH);when the concentration of GSH is 25mg/L?125 mg/L,the linear regression equation is?A=0.0031C+0.6702(C is the concentration of GSH).The detection limit was 0.05?g m L^-1.This method is expected to show a good application prospect in GSH detection.2?Cu-Zn-Fe-LDHs and Mn-doped ZnS QDs Cu-Zn-Fe-LDHs/Mn-ZnS QDs composites were prepared by co-precipitation method,and the materials were characterized by XRD,FTIR,TEM and other characteristics.Using MB as a model pollutant,the Fenton-like catalytic performance of Cu-Zn-Fe-LDHs,the photocatalytic performance of Mn-ZnS quantum dots,and the formation of QDs with different proportions of Cu-Zn-Fe-LDHs and Mn-ZnS were studied under different conditions.Performance of Cu-Zn-Fe-LDHs/Mn-ZnS QDs for catalytic degradation of MB.The experimental results show that,compared with Cu-Zn-Fe-LDHs and Mn-ZnS QDs,the synergistic catalysis of Cu-Zn-Fe-LDHs/Mn-ZnSQDs can improve the catalytic efficiency and shorten the degradation time,which has application potential significant in organic wastewater treatment..3?Cu-Zn-Fe-LDHs/CaO₂composites were prepared by co-precipitation method,and the materials were analyzed by XRD,FTIR,TEM and other characteristics.The physical and chemical properties of solid CaO₂are stable.H₂O₂can be slowly released in a hydration medium,which can overcome the problem of inefficient decomposition of H₂O₂.Therefore,Cu-Zn-Fe-LDHs/CaO₂as a Fenton-like catalyst does not require H₂O₂.Based on the MB pollution model,the influencing factors of Fenton-like catalytic degradation were explored to find the best degradation conditions.In addition,Cu-Zn-Fe-LDHs/CaO₂has a good aerobic effect,can accelerate the metabolism of aerobic microorganisms,digest and decompose organic matter to achieve the effect of water purification.