Study On Preparation Of CdS@CP/CFs Composite And Its Photocatalytic And Antibacterial Properties

Fourier transform infrared spectroscope(FTIR),scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDX)and X-ray diffraction(XRD)were used to confirm that PANI and PPy were successfully polymerized onto the CFs and CdS was recombined with conductive polymer/cellulose fibers(CP/CFs)in Cadmium sulfide@polyaniline/cellulose fibers(CdS@PANI/CFs)and cadmium sulfide@polypyrrole/cellulose fibers(CdS@PPy/CFs)composites which were parpared via a two step in situ synthesis.The deposition amount of CdS increased 84.54%and 138%after PANI and PPy were polymerized onto the CFs compared with the largest deposition amount of CdS onto CFs.The results of photocatalysis degradation of methylene blue(MB)of different materials under the irridation of 300 W Xe lamp revealed that CFs and PANI/CFs were no function of photocatalysis,CdS in CdS@CP/CFs played the role of photocatalytic activity,whereas PPy could degrade MB in some degree.The MB degradation ratio of CdS@CP/CFs increased with increasing deposition amount of CdS,and the MB degradation ratios of CdS@PANI/CFs and CdS@PPy/CFs were 1.5 and 4.0 times,respectively,compared with CdS@CFs at the same deposition amount of CdS.CdS@PPy/CFs exhibited the highest absorption capacity in all materials,it could decrease the concentration of MB from 35 mg/L to 6.34 mg/L.The best MB degradation ratios of CdS@PANI/CFs and CdS@PPy/CFs were 90.37%and 54.43%when the initial concentrations of MB were 10 mg/L and 35 mg/L and the reaction time was 5 h,respectively.CdS@PANI/CFs had good reusability.The MB degradation ratio increased with the decrease of MB concentration and the increase of CdS@CP/CFs dosage.The higher illumination intensity promoted the improvement of MB degradation ratio of CdS@CP/CFs,which was confirmed by the UV-illumination at 30 W and 60 W.The UV photocatalysis MB degradation ratios of CdS@PANI/CFs and CdS@PPy/CFs were 1.5 and 2.3 times compared with CdS@CFs at the same deposition amount of CdS and 60 W of illumination intensity,and the improvement was lower than that of visible light irradiation.This was caused by the higher improvement of CdS@CFs than CdS@CP/CFs under UV irradiation.The conclusions of functions of various components,influence of MB concentration and photocatalyst dosage on degradation ratio were the same as the results from visible light illumination.The antibacteria experiments indicated that CFs and PANI/CFs had no activity to inhibit the growth of Staphylococcus aureus and Escherichia coli,while PPy/CFs,CdS@CFs,CdS@CP/CFs showed favorable antibacterial activity for both bacteria.The larger deposition amount of CdS in the composite,the better the antibacterial activity.Staphylococcus aureus was more sensitive to PPy/CFs,CdS@CFs and CdS@CP/CFs than Escherichia coli.