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以Na_2SnO_3和CO_2为反应物,十六烷基三甲基溴化铵(CTAB)为稳定剂,在温和条件下合成粒径小于10nm的SnO_2纳米晶。CO_2作为酸性气体,有利于精确调控Na_2SnO_3溶液的pH值,Na_2SnO_3价廉且性质稳定,易于操作。研究Na_2SnO_3浓度、CTAB浓度、熟化温度和熟化时间等对产物的影响。结果表明,随着Na_2SnO_3浓度的增加、熟化温度的升高和熟化时间的延长,粒径变小,粒子形成过程可由静电作用机理解释。SnO_2纳米晶具有良好的光催化活性,且随着粒径的减小,其活性增大。
SnO_2 nanocrystals with size less than 10nm were synthesized under mild conditions using Na_2SnO_3 and CO_2 as reactants and cetyltrimethylammonium bromide (CTAB) as stabilizer. CO_2, as an acid gas, is conducive to the precise control of pH value of Na_2SnO_3 solution. Na_2SnO_3 is cheap, stable, and easy to operate. The effects of Na 2 SnO 3 concentration, CTAB concentration, aging temperature and aging time on the product were studied. The results show that with the increase of Na 2 SnO 3 concentration, the aging temperature and the aging time, the particle size becomes smaller and the particle formation process can be explained by the mechanism of electrostatic action. SnO2 nanocrystals have good photocatalytic activity, and with the particle size decreases, its activity increases.