Preparation And Performance Of Palygorskite-supported Cadmium Sulfide-based Composite Photocatalytic Material

As we all know,water is an important part of human daily life.However,as a large amount of organic pollutants produced by factories are discharged into the water,the safety problems of river organisms and human daily water use are seriously threatened.Therefore,it is a research hotspot now how to solve the water pollution problem with low energy consumption and no secondary pollution.In this paper,three palygorskite/cadmium sulfide-based composite photocatalysts were obtained by different cadmium sulfide-based materials loaded palygorskite with a large specific surface area.Under visible light,the photocatalytic degradation performance of composite materials was studied using different organic pollutant probes.The main contents are as follows:1.PGS@Cd S/Zn-Fe LDO composite photocatalyst was prepared by the co-precipitation-calcination method using palygorskite,cadmium chloride,sodium sulfide and zinc nitrate as raw materials.Photocatalytic degradation of malachite green under visible light,50%PGS@Cd S/Zn-Fe LDO(PGS:Zn-Fe LDO=1:1（mass ratio）has better photocatalytic activity from combining the adsorption capacity and photocatalytic activity of PGS@Cd S/Zn-Fe LDO.The degradation rate of MG was95.1%when 30 m L 20 mg/L malachite green solution containing 20 mg composite material was irradiated for 60 min.After 50%PGS@Cd S/Zn-Fe LDO was used for 4times,the photocatalytic degradation rate of malachite green was reduced by 4.1%.It showed that 50%PGS@Cd S/Zn-Fe LDO has better stability.In addition,the composite material has a certain degradation effect on MO,MB,Rh B,CV,acid fuchsin and tetracycline.2.PGS@Cd S/Zn S composite photocatalyst was prepared by a one-pot hydrothermal method using palygorskite,cadmium chloride,zinc chloride,and thioacetamide as raw materials.The photocatalytic activity of 33%PGS@Cd S/Zn S was the best in different composite material under visible light irradiation.It can degrade some dyes such as MO,MB,Rh B,CV,MG,acid fuchsin and tetracycline.The degradation effect of Rhodamine B was the best above dyes.Light for 40 min,the degradation rate of Rh B was 98.4%when 20 mg photocatalyst was added 30 m L Rh B solution（20 mg/L）and its main active group was O₂^-.The degradation rate of Rh B retained 96.4%using 5 times under the same conditions.The stability of PGS@Cd S/Zn S was good.3.PGS@Cd S/Cd In₂S₄ composite photocatalyst was prepared by a one-pot hydrothermal method using palygorskite,cadmium chloride,indium nitrate,and thioacetamide as raw materials.The maximum absorption edge of20%PGS@Cd S/Cd In₂S₄ is located at 567 nm,which absorbs light from 200 to 500nm strongly.The photocatalytic activity of the composite material on rhodamine B was investigated under visible light.The degradation rate of Rh B was 99.5%when 20mg 20%PGS@Cd S/Cd In₂S₄ was added to Rh B.The degradation rate of Rh B was almost unchanged using 5 times.It indicated that the stability of photocatalyst was high.Under the same experimental conditions,the degradation rates of MO,MB,CV,MG,acid fuchsin and tetracycline were 31.2%,89.5%,89%,97.3%,23.6%and95.8%,respectively.