【摘要】 研究由氯氧化铋直接制备纳米氧化铋新工艺。氯氧化铋经碳酸氢铵-氨水二次脱氯转型后得到氧化铋前驱体碳酸氧铋,烘干后热解得氧化铋产品,平均粒径约40nm,含氯仅为0.62%。增大碳酸氢铵浓度、适当提高溶液的pH值及转化液的温度均有利于氯的脱除,在pH=9,温度为50℃下进行二次脱氯效果最佳,而530℃下煅烧2.5h则有利于得到细颗粒的产品。与传统的硝酸盐体系比较,新工艺不仅消除了NOx的污染,而且易获得纯度高的产品,具有良好的推广应用前景。更多还原

【Abstract】 A novel technology on directly preparation of nanometer Bi₂O₃ from BiOCl is investigated.The bismuth（oxide） carbonate,precursor of the Bi₂O₃,is produced by transformation and twice elimination of chloride with NH₄HCO₃-NH₃ solution from BiOCl.The product with 40nm in average diameter and 0.62% in chloride（content） is prepared by thermal decomposition of the dried precursor.It is benefit to elimination of the chloride that the concentration of the NH₄HCO₃,solution pH and temperature are increased,the optimal result of twice chloride elimination is achieved under condition of pH=9 and 50℃,and calcine at 530℃ for 2h is favorite to yielding the product with fine particle.Comparing to the traditional process with nitrate medium,the novel technology is not only without the pollution of the NO_x,but also easily preparation of excellent product with high purity.It will be an ideal perspective in application and dissemination.更多还原