Preparation of CdS/ZnS-PVDF/PSF Photocatalytic Membrane and Its Degradation Performance of Congo Red
Photocatalytic membrane separation coupled technology for wastewater treatment is one of the research directions in water treatment.Photocatalytic membrane technology is a combination of membrane separation technology and photocatalytic technology,which effectively solves the problem of difficult photocatalyst recovery and also alleviates the problem of membrane pollution.CdS and CdS/ZnS photocatalysts were prepared by hydrothermal method,and polyvinylidene fluoride/polysulfone(PVDF/PSF)membrane,CdS-PVDF/PSF photocatalytic membrane and CdS/ZnS-PVDF/PSF photocatalytic membrane were prepared by using the phase conversion method.Congo red was used as a pollutant,and xenon lamp was used as a light source.The membrane flux,rejection and degradation ratios of Congo red by using these three membranes were tested,compared and analyzed.The results showed that the membrane flux of CdS/ZnS-PVDF/PSF photocatalytic membrane could reach 63.0 L·h-1·m2 for 360 min,which was significantly increased compared to 36.0 L·h-1·m2 of PVDF/PSF membrane and 52.1 L·h-1·m2 of CdS-PVDF/PSF photocatalytic membrane,indicating that the loading of CdS/ZnS effectively alleviated the attenuation of PVDF/PSF membrane flux due to Congo red molecules blocking the pore.While the membrane flux increased,the rejection of Congo red by using the CdS/ZnS-PVDF/PSF photocatalytic membrane remained at 100%after 360 min.The degradation ratio of Congo red by using CdS/ZnS-PVDF/PSF photocatalytic membrane reached 86.9%after 360 min,which was 18.1%and 6.2%higher than that by using PVDF/PSF membrane and CdS-PVDF/PSF photocatalytic membrane,respectively.The CdS/ZnS-PVDF/PSF photocatalytic membrane can achieve the highest membrane flux and degradation ratio,which has a good application prospect for the degradation of organic pollutants in wastewater.
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