Preparation Of Nano Antimony Sulfide From Natural Stibnite And Its Potential Application In Ocean

Nano Sb2S3 could be used as photocatalytic to degrade organic pollutants in the ocean,and it is also an important material for the development of solar system in the offshore platform,which is useful to the exploitation of marine resources.However,the nano Sb2S3 could only be prepared in the laboratory rather than in large-scale,due to the high cost of commercial reagents.While natural stibnite,as a kind of easily mined and abundant mineral in nature,is undoubtedly more suitable to be a raw material to synthesize nano Sb2S3.Hence,in this paper,nano Sb2S3 were successfully synthesized via hydrothermal method under the assistance of polyethylene glycol(PEG6000)and N,N-Dimethylformamide(DMF),using natural stibnite as precursor.And this paper study the photoelectric conversion properties of the obtained nano Sb2S3 and its application in the the degradation of marine organic pollutants.This paper also prepared AgCl/Sb2S3 compound material by dip-coating method with NaCl and AgNO3 as precursors,and explore the influences of different amount of AgCl to the photoelectric conversion and photocatalytic properties of the compound material.A series of characterizations showed that the Sb2S3 samples prepared under different experimental parameters have different microstructure and property.When the temperature is below 160 ℃,the obtained Sb2S3 samples were unregular nanoparticles with poor crystallinity and weak photoelectric conversion ability,while the samples had a wide band gap and strong photocatalytic ability,which could degrade 91.9%of Methyl orange in 10 minutes,since it could produce more strong oxidation free radical in the solution under visible-light.The results indicated the obtained samples are suitable for the degradation of organic pollutants in the ocean.When the temperature is higher than 160 ℃,the obtained Sb2S3 samples were transformed into nanoflakes or nanorods with poor photocatalytic ability,which could only degrade 70.1%of Methyl orange in 60 minutes,while the samples had good crystallinity,strong photoelectric conversion ability,and could use most of visible-light,due to its narrow band gap.The Sb2S3 nanorods modified with AgCl showed better performance,and the samples with 10 times dip-coating had the best performance.The modified Sb2S3 had little differences in the band gap and microstructure,however,its photoelectric conversion and photocatalytic ability were significantly improved.The addition of AgCl reduced the recomination speed of the electron-hole pairs and improved the absorb ability of the composites.So,the composites will show better performance in the degradation of marine organic polluntants and the solar photoelectric conversion system.