| Water pollution is an increasingly serious global problem.Dye pollutants are one of the most important sources of pollution.The rapid and harmless treatment of dyes in water is an important way to solve water pollution.Among many treatment methods,photocatalytic degradation of carbon composite materials based on semiconductor is a kind of promising technical means,and biomass is a kind of raw material for preparing carbon materials..In this work,we used biomass-derived sugars as precursors to synthesize a copper-supported porous carbon nanospheres by one-step ultrasonic spray pyrolysis.Then,the photocatalytic performance of the material was tested by dye fouling model methyl orange.The experimental results showed that the porous carbon nanospheres have excellent structural properties and dye-degradation properties.In order to further improve the usability and recycling performance of the materials,the synthesis method was further improved and a one-step ultrasonic spray pyrolytic deposition method was designed.The porous carbon nanospheres loaded with copper were directly pyrolyzed and deposited on the surface of monocrystalline silicon to prepare porous carbon nanofilms.Then the photocatalytic degradation,cycling performance and reaction kinetics of the membrane material were studied.The results of electron microscopy and characterization showed the membrane has excellent surface morphology and structural.The results of degradation experiments showed the membrane material exhibited good dye-processing performance and reusability in the photocatalytic degradation and cyclic performance tests of methyl orange.The mechanism analysis showed that the adsorption performance of porous carbon nanoparticles and the photocatalytic performance of cuprous oxide synergistically promoted the efficient degradation of methyl orange.The material design and synthesis method presented in this paper and its application have broad application prospects in the design of photocatalytic materials and the degradation of dyes.This paper mainly focuses on the design of photocatalytic materials and the photocatalytic performance of thin film materials:1.One-step ultrasonic spray pyrolysis method was designed to prepare porous carbon nanospheres.The properties and structure of carbon nanospheres were controlled by metal loading and synthesis conditions changing.First,the ultrasonic spray pyrolysis synthesis device was built by using tubular furnace,ultrasonic atomizer and pipeline carrier gas system,etc.,and then the precursor was atomized and sent to the pyrolysis area for pyrolysis synthesis.Transmission electron microscopy(TEM),scanning electron microscopy(SEM),X-ray energy spectrometry(EDS)and other analysis and characterization results show that the size of carbon nanospheres is 600-1500 nm,the pore size is 50-200 nm.Finally,the synthesis conditions and equipment parameters were adjusted to explore their influence on the product and obtain the optimal combination of synthesis conditions.2.One-step spray pyrolytic deposition method was improved to prepare coppersupported porous carbon nanofilms,and the photocatalytic degradation experiment,cycling performance experiment and reaction kinetics analysis were carried out.On the basis of the synthesis of porous carbon nanospheres,the porous carbon nanospheres supported by metal copper were deposited directly on the surface of monocrystalline silicon to prepare thin films.The results of electron microscope observation and a series of physical and chemical tests showed that the cuprous oxide particles loaded on the porous carbon nanospheres were 20-100 nm,the cuprous oxide band gap was about 2.1e V,and the surface of the film was uniform and compact without cracks.The photocatalytic degradation experiments showed that the degradation rate of methyl orange reached more than 80%.The results of the subsequent cycle performance test showed that the degradation rate did not decrease significantly after 8 cycle tests,showing a good photocatalytic degradation performance. |
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