| With the rapid development of the industry,great amount of trade effluent is discharged into natural which makes the problem of water pollution gradually serious.There are many pollutants in the trade effluent such as organic dyes,heavy metals,antibiotics and so on.This residuum is not only made the problem of water pollution gradually serious,but also caused irrevocable damages to human health.Photocatalysis technology,as an environmentally friendly technology that uses low energy consumption solar energy,possess some advantages which are cheap,easy operation,nontoxic,no secondary pollution and low cost,so it is the most widely used to process water pollutions.Among the many materials that can be used in photocatalytic reactions,BiOI is proverbially used for the degradation of organic dyes in water environments which have layered structure and could be motivated by visible light to show high photocatalytic activity.However,BiOI has supernal recombination rate of electron and hole.It is indispensable to further modify it to enhance its photocatalytic activity.In many modification methods,the addition of the functional electron acceptor material has become the most common method.Recently,biomass carbon is widely used as electron acceptor material due to their outstanding advantages such as raw material effortless collection,renewable,cheap and rich pore structure.In this paper,we have prepared a flower-like BiOI material by controlling experimental conditions,and adding biochar,Ag and biomass carbon quantum dots to construct the composite materials to improve the photocatalysis.The concrete researching contents are as follows:(1)Using bamboo leaves as raw materials to prepare biochar by a series of thermal decomposition methods,and preparing flower-like BiOI was synthesized by a facile solvothermal method.Then the BiOI/C binary composites photocatalysed materials were synthesized by tubular furnace calcination.The structure and performance of synthesized catalysts were characterized by TEM、PL、SEM、XRD、and electrochemical and other test methods,and the effects of different carbon contents on photocatalytic degradation of Methylene blue(MB)were investigated,to explore the optimal composite ratio.The results indicated that the adding biochar can improve the detached frequency of electron-hole pairs and the photocatalytic activity.Moreover,the mass ratio of BiOI and biochar of BiOI/C binary composites photocatalysed materials is 2:3 has exhibited the optimal photocatalysis activity and made the degradation rate of MB was up to 79.6%.(2)The noble metal Ag particles were deposited on the surface of flower-like BiOI by photoreductive deposition technique.Then the Ag/BiOI/C ternary plasma resonance composite photocatalysed materials were prepared by high-temperature tube furnace calcination.The structure and performance of synthesized catalysts were characterized by TEM、PL、SEM、XRD、electrochemical、UV-vis,and the effects of different noble metal Ag particles contents on photocatalytic degradation of MB were investigated.The results displayed that the added noble metal Ag particles can improve the photocatalytic activity,because that the noble metal Ag particles have the surface Plasmon resonance effect.When the ratio of Ag/BiOI/C is 0.5:2:3,it has the outstanding photocatalysis activity and made the degradation rate of MB was up to 87.4%.(3)Using glucose as raw materials to prepare biomass carbon quantum dots(B-CQDs)were prepared by hydrothermal method,then the biomass B-CQDs/BiOI composite photocatalysts were synthesized by one-step solvothermal method,and charactered by Raman、XPS、TEM、EDS、electrochemical.The results showed that the additions of B-CQDs can improve the detached rate of electron-hole pairs.The optimum proportion of B-CQDs and BiOI was explored by photocatalytic degradation of organic dyes MB and the 7 wt% CQDs/BiOI material exhibited the distinguished photocatalytic activity for degradation of MB and the degradation rate could be achieved 90.1% after 80 min. |
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