Preparation And Environmental Application Of Poly(lactic Acid) Electrospun Composite Fiber Based On High Specific Surface Area Carbon Black

In this paper,the composite?ZIF-8@C600?was synthesized by co-deposition using the oxidized carbon black?C600?with metal-organic frameworks?ZIF-8?.Then the ZIF-8@C600was calcined under 700?to obtain the composite?ZnO@C600?made up of ZnO and C600.The environmentally friendly poly?lactic acid??PLA?was used as matrix,and three kinds of PLA composite nanofibers?PLA/C600,PLA/ZIF-8@C600 and PLA/ZnO@C600?were prepared by electrospinning technology using the C600,ZIF-8@C600 and ZnO@C600as filler,respectively.The applications of the composite nanofibers for environmental pollution treatment were studied.The adsorption ability of PLA/C600 for PM_2.5,the oil adsorption and separation properties of PLA/ZIF-8@C600 and photocatalytic degradation performance of PLA/ZnO@C600 for methylene blue?MB?were investigated,respectively.Besides,the correlative properties and mechanism were also analyzed.The results showed that the incorporation of C600 can influence the morphology and hydrophobicity of pure PLA fiber,and the PM_2.5 adsorption ability was obviously enhanced even if the content of C600 was 0.1 wt%.When 0.2 wt%C600 was added,the PM_2.5adsorption capacity of the PLA/C600 fiber was as high as 20.5%,which was almost three times that of pure PLA fiber,and the removal efficiency could be stabilized at over 97%for a long time.The dispersibility of C600 in methanol was greatly improved after the purification and oxidization.ZIF-8@C600 composite particles prepared by co-deposition of oxidized C600and ZIF-8 were used to modify the PLA fiber.The results suggested that the ZIF-8@C600 can control the diameter and surface porosity of PLA fibers and improve the hydrophobic and oil-lipophilic properties of PLA fibers.The PLA/ZIF-8@C600 composite fiber with 1 wt%ZIF-8@C600 had the smallest diameter?7.17?m?,maximum porosity,the strongest hydrophobicity?134.93°?,and optimal oil adsorption capacity?23.3±0.85 g/g?.The composite?ZnO@C600?made up of ZnO and C600 was obtained by calcining ZIF-8@C600 at 700 ^oC,and used as the photocatalytic degradation modifier for PLA matrix.The studies presented that the PLA/ZnO@C600 composite fibers had higher photocatalytic degradation ability for MB.The PLA/ZnO@C600 fiber had the best photocatalytic degradation efficiency?66.27%?when 0.1 wt%of ZnO@C600 was added,in addition,the photodegradation efficiency was still higher than that of pure PLA fiber after 5 cycles.