Halogen-directed nucleation and growth of Bi2O3 columnar hierarchitectures. (April 2016)

• Record Type: Journal Article
• Authors: Gong, Shu; Han, Qiaofeng; Zhu, Junwu; Wang, Xin; Lu, Lude
• Is Part Of: Materials research bulletin. Volume 76(2016)
• Page Start: 222
• Page End: 228
• Publication Date: 2016-04
• Subjects: A. Inorganic compound -- B. Chemical synthesis -- C. Electron microscopy -- D. Catalytic properties; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2015.12.029
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Columnar Bi2 O3 hierarchitectures with better photoreactivity over scattered rods were prepared by introducing into halogen ions. Highlights: Bi2 O3 columns were synthesized by introducing Clˉ to the reaction system. Formation of the intermediate BiOCl adjusted the Bi2 O3 nuclei and growth rate. It is Clˉ not CAT + of CATC that mainly influenced the formation of Bi2 O3 columns. Abstract: It is generally believed that the positive ions of surfactants such as cetyltrimethylammonium bromide (CTAB) and chloride (CTAC) play a key role in controlling morphology and size of the nanocrystals. Herein, we found that it was negative ions that mainly affected the morphology of α-Bi2 O3 . The well-crystalline Bi2 O3 columnar hierarchitectures assembled by highly-aligned nanorods have been synthesized from the reaction of bismuth citrate and KOH aqueous solution at room temperature with the assistance of halogen ions like Cl − or Br −, whether they came from inorganic salts MX ( M = Na +, K + or NH4 + ; X = Cl − or Br − ) or surfactants CTA X . The formation mechanism of columnar α-Bi2 O3 microstructures in the presence of halogen ions was discussed by adjusting the experimental parameters such as NaCl concentration, pH values and so on. The as-prepared Bi2 O3 columns exhibited enhanced photocatalytic activity for Rhodamine (RhB) degradation under visible light than scattered Bi2 O3 microrods.