Semiconductor Photocatalyst of Tin Oxide Quantum Dots Prepared in Aqueous Solution for Degradation of Organic Pollutants in Contaminated Water


  • Jianqiao LIU Dalian Maritime University
  • Ye HONG Dalian Maritime University
  • Xinyue TIAN Dalian Maritime University
  • Xiangxu MENG Dalian Maritime University
  • Ge GAO Dalian Maritime University
  • Tiantian HE Dalian Maritime University
  • Yichen NIE Dalian Maritime University
  • Guohua JIN Dalian Maritime University
  • Zhaoxia ZHAI Dalian Maritime University
  • Ce FU Dalian Maritime University



tin oxide, quantum dot, photocatalyst, pollution remediation, water environment


Stannous chloride and thiourea are used as source materials to prepare SnO2 quantum dots in the aqueous solution by a facile hydrolysis-oxidation process. The quantum dots have an average size of 1.9 nm with good dispersibility as well as long-term stability, and are validated to be an effective photocatalyst for the degradation of organic oil pollutants in contaminated water. The pollutant is removed by the quantum dots exposed to ultraviolet-visible irradiation at room temperature. The optimized condition is concluded to be a solution with quantum dot concentration of 10-3 mol/L and the degradation speed reaches the maximum at the 12 th hour after irradiation. After 48 hours, 91.9 % of octane is removed, concluding a high degradation efficiency. The prepared SnO2 quantum dots are potentially applicable in the remediation of marine environment as they hold the advantages of high efficiency, low cost and being environmental-friendly. The promotion and inhibition mechanisms of the photocatalytic SnO2 QDs at low and high concentrations are discussed.