Study On Regenerated Cellulose Hydrogel Material Construction And Photocatalytic Performance

Due to the special role and excellent biodegradability,regenerated cellulose materials have potential applications in packaging,textiles,water treatment,photoelectric sensing,and biomedicine.In this work,we studied the construction of regenerated cellulose hydrogel materials based on a two-component ionic liquid to dissolve cellulose,and explored its application in the field of photocatalysis.We studied the different rheological beharviours formed by adding water to the cellulose solutions,in order to reveale the sol-gel transition mechanism.With a slight increase in the water concentrations,the initial viscosity increases.At 4 wt%water content,the initial viscosity of the 8wt%cellulose solution suddenly increases to 10~4 Pa·s.Meanwhile,the intersection point of storage modulus and loss modulus moves from 13.0 Hz to 0.06 Hz.According to the Cox-Merz rule and the Cross model,the rheological data shows a serious deviation.At this time,the cellulose solution has been gelated,which is thermally irreversible.The anti-solvent(water)was added to the cellulose solution(pre-gelation).Then the cellulose solutions with different pre-gelation degree were converted into regenerated cellulose hydrogel by sol-gel.According to the study,the structure of the hydrogel is dense,which prepared by the cellulose solution with 2 wt%water content.Meanwhile,the tensile strength and elongation at break of the hydrogel are3.044 MPa and 90.94%,respectively.In addition,the transmittance of the hydrogel prepared from the cellulose solution with 4 wt%water content can reach 72.2%at 800 nm.Selected the regenerated cellulose hydrogel,prepared by the cellulose solution with 2 wt%water content,as a substrate.Then,theβ-Fe OOH nanoparticles were fasten to the surface of the hydrogel.The photocatalytic performance of the regenerated cellulose nanocomposite hydrogels had been studied.The results confirm thatβ-Fe OOH nanoparticles are successfully prepared and uniformly dispersed.The hydrogel has the good photocatalytic activity,which prepared with a reaction time of 12 hours.Meantime,the degradation efficiency of methylene blue can reach 99.99%,at 30 minutes.In addition,the degradation efficiency above 96.75%after 7 times of reuse.