Preparationand Catalytic Activity Of ZnS/g-C₃N₄ Compesites With Multiply Morphologies

Polymeric graphite phase carbon nitride?g-C₃N₄?,has elicited ripples of excitement for lower price and nonmetallic elements.However,the intrinsic drawbacks of g-C₃N₄,such as high bingding energy,wide energy gapandrapid recombination of charge carrierslimitthe utilization of the sunlight.In order to promote the catalytic performance of g-C₃N₄,strategies are employed to suppress the recombination of charge carriers in g-C₃N₄.In this paper,sulfur group semiconductor materials of ZnS nanoparticals,ZnS nanosheets,ZnS nanorode-flowers and ZnS hollow spheres were prepared through solvothermal method and microwave-assiet method,respectively.We take advantage of two approaches to modulate the intrinsic properties of g-C₃N₄:?1?It is expected that uniting different morphologies of ZnS and g-C₃N₄ sheets to obtain ZnS/g-C₃N₄ composites.?2?Using a chemicalexfoliation method to modify.The properties of photocatalytic and electrochemical activities were studied about the modified g-C₃N₄.More details are as follows:?1?Serial hollow spheres ZnS were synthesized facilely by a non-template method.The effects of microwave power,recreation time and recreationtemperature on the formation of ZnS werestudied systematically.The synthetic of ZnS that reacts 21 minunder the condition of 1000 W,70°C possesesthe higest response current in p-nitrophenol applied to detectp-nitrophenol.It was found that,the oxidation peak current of p-nitrophenol increased and in a linear fasion over the range of 3¹90?mol·L^-1 with the precision of1?mol·L^-1?S/N=3?.And the recovery rate of p-nitrophenol is between 98.03%¹06.10%.In the light of the aboved discuss,we have established a new and fleet method for detecting p-nitrophenol in water.?2?ZnS nanoparticals,ZnS nanosheets and ZnS nanorode-flowers weresuccessfully synthesized by a solvothermal method.Then the four different morphologies of ZnS/g-C₃N₄ composites were prepared successfully by a stir-mixing method.Moreover,we compared the BET surface area,photocurrent and flat band potential of the four morphologies of ZnS/g-C₃N₄ composites.It suggested that,theBET surface area,photocurrent and flat band potential of 10 wt%ZnS_NPs/g-C₃N₄ and 10 wt%ZnS_NSs/g-C₃N₄are close.The BET and flat band potential of 10 wt%ZnS_NPs/g-C₃N₄ and 10 wt%ZnS_NSs/g-C₃N₄are gradually increas.While,10 Wt%ZnS_HSs/g-C₃N₄ possessesthe largest BET surface area,higest photocurrent and more positive potential compared with other composite.Applied it to photocatalytic degradation of RhB,the value of degradation rate constant is 1.62 k·h^-1,which is4.6 times of pure g-C₃N₄.After five cycles experiment,the10 Wt%ZnS_HSs/g-C₃N₄nanocomposite photocatalystsonly decresed 9.8%of photocatalytic degradation of 100 ppm RhB.This means that the 10 Wt%ZnS_HSs/g-C₃N₄nanocomposite photocatalysts have a good stability.?3?We adopted a chemicalexfoliation pathway to modulate g-C₃N₄ from bulk g-C₃N₄in alkaline solution.And three kinds of alkali solutionwere chosen to modifiy g-C₃N₄,they areammonium hydroxide,ethanol amine and sodium hydroxide,founding that the ammonia hydroxide stripping g-C₃N₄ works best.So ammonia hydroxidewas employed in the following reaserch.And the thin g-C₃N₄ nanosheets was obtained by the above method.In addition,the exfoliation time has a great influence on morphology,after 4 h the morphology changes form lamella/sheet to tube.The results show that the performance of thin g-C₃N₄ sheet is superior to bulk g-C₃N₄,especially the productin of CN4exhibit lowest surface electron transfer resistance,and the value is 332 ohm.Moreover,we successfully bulita pentachlorophenolelectrochemical sensor of CN4/GCE,and i-t Amperometric are used to analyse it,suggesting that the current increases linearlywithin the range of0.31¹10?mol·L^-1,with the limitation of 0.1?M?S/N=3?.It is suitable for the detection of PNP in the environment.