Using lignin fiber pretreated by alkaline oxidation method as the carrier and tetrabutyl titanate as the titanium source,a TiO2-loaded lignin fiber composite photocatalyst was prepared by sol-gel method.The removal ability for methyl orange and the cyclic reaction performance under ultraviolet photocatalysis were tested.The structural performance of the TiO2-loaded lignin fiber composite material was characterized by X-ray diffraction (XRD),scanning electron microscope (SEM),Fourier infrared spectroscopy (FT-IR) analysis,and thermogravimetric analyzer (TG-DSC).The research results showed that the titanium dioxide particles were uniformly distributed on the surface of the lignin fiber,thereby forming a highly dispersed TiO2-loaded lignin fiber composite photocatalytic material.When the tetrabutyl titanate was 10mL,the amount of anhydrous ethanol was 35mL,the pH was 3 and the temperature was 35℃,the highest yield of TiO2 was up to 89%.When under ultraviolet light for 2h,the highest degradation rate of methyl orange under different concentrations was 75.5%,the highest degradation rate of methyl orange under different pH values was 80.1%,and the best removal rate of methyl orange solution at different temperatures was 63.2%.The TiO2-loaded lignin fiber composite photocatalyst showed good resistance to cycle attenuation during recycling.After 5 cycles,the degradation rate of methyl orange still reached 77.6%.
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基金资助
国家重点研发计划(2020YFC1910205)
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