BiVO4Hollow Nanospheres: Anchoring Synthesis, Growth Mechanism, and Their Application in Photocatalysis
作者： Wenzong Yin , Wenzhong Wang , Meng Shang , Lin Zhou , Songmei Sun
关键词: Amorphous solid 、 Nanotechnology 、 Adsorption 、 Crystallization 、 Nanoparticle 、 Calcination 、 Photocatalysis 、 Chemical engineering 、 Chemistry 、 Metal ions in aqueous solution 、 BET theory 、 Inorganic chemistry
摘要: An anchoring method was developed to synthesize monoclinic BiVO4 (m-BiVO4) hollow spheres with a size of about 700 nm by employing colloidal carbon (CCSs) as hard templates. The influence synthesis conditions and the growth mechanism were investigated XRD, TEM, SEM through series comparison experiments. It found that two-stage heat treatment essential for nanospheres. Bi3+ ions firstly adsorbed on surface CCSs worked anchors in first stage (80 °C). In second (100 °C), VO3– reacted anchored ions, amorphous nanoparticles thus precipitated surface. analysis calcination process revealed promoted crystallization into m-BiVO4 crystals at 236 °C removed 353 °C. as-prepared nanospheres exhibited higher photocatalytic activity than prepared aqueous solid-state reaction degradation rhodamine B acetaldehyde, which could be attributed their BET area (5.85 m2 g–1) larger band gap (2.36 eV). Given general adsorption metal surface, this extended other hollow-structured multicomponent oxides. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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