Topotactic synthesis and photocatalytic performance of one-dimensional ZnNb₂O₆nanostructures and one-dimensional ZnNb₂O₆/KNbO₃hetero-nanostructures

Abstract

This paper introduces one-dimensional ZnNb 2 O 6 /KNbO 3 hetero-nanostructures and one-dimensional ZnNb 2 O 6 nanostructures. These nanostructures are synthesized via in situ topotactic structural transformation reaction using the tunnel structure K 2 Nb 2 O 6 filiform crystal as precursor. Firstly, Zn 2+ ions intercalate into K 2 Nb 2 O 6 crystal by exchanging K + ions from the K 2 Nb 2 O 6 crystal with Zn 2+ from Zn(NO 3 ) 2 or Zn(CH 3 COO) 2 aqueous solution, to form two different Zn 2+ -exchanged samples, and then these Zn 2+ -exchanged samples topotacticly transform into one-dimensional ZnNb 2 O 6 /KNbO 3 heteronanostructures and ZnNb 2 O 6 nanostructures during heat-treatment. The formation reaction and structure of these samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), selected-area electron diffraction (SAED), and energy-dispersive spectroscopy (EDS). Photocatalytic experiments showed that one-dimensional ZnNb 2 O 6 /KNbO 3 hetero-nanostructures and ZnNb 2 O 6 nanostructures have excellent photocatalytic performance for the degradation of methylene blue (MB), rhodamine B (RhB), and methyl orange (MO).

Facile synthesis of CeO2 hollow structures with controllable morphology by template-engaged etching of Cu2O and their visible light photocatalytic performance

“…To utilize solar energy in a more efficient way, the design and preparation of visible light-active photocatalysts is highly demanded and thus has attracted intensive efforts in the practical application of such photocatalytic system [5][6][7][8]. In the recent decades, various semiconductor photocatalysts such as modified TiO 2 [9][10], multi-metal oxides [11][12], sulfides [13], oxynitrides [14][15], and hetero-structures [16][17] have been successfully developed. These compounds show possibilities in photocatalytic water splitting or pollutant degradation under visible light irradiation.…”

One-step synthesis of vanadium-doped anatase mesocrystals for Li-ion battery anodes

“…Several attempts to obtain solid solution (SS) mesocrystals have been reported to date. Those include functional titanate and niobateceramics Ba 0.5 (Bi 0.5 K 0.5 ) 0.5 TiO 3 [12], Ba 0.9 Ca 0.1 TiO 3 [13], LiNbO 3 /KNbO 3 [14]; photocatalytic N:TiO 2-x [15],Cr-Sb:TiO 2-x [16] and ZnNb 2 O 6 /KNbO 3 [17]; catalytic Ce 1−x Zr x O 2 [7] for CO conversion; LiMn 0.8 Fe 0.2 PO 4 [11] electrode materials and superparamagnetic Mn x Fe 1−x O [18]. With the known doping approaches, a successful enhancement of the catalytic activity and exchange currents has been accomplished [9].…”

In situ synthesis and photocatalytic performance of WO3/ZnWO4 composite powders

“…4 This method has been utilized for the synthesis and design of metal oxides and organic inorganic nanocomposites with controlled structure, morphology, and chemical composition. 5 Zinc tungstate (ZnWO 4 ), as one of the important metal tungstates, has attracted wide interest due to its widespread and potential applications in various elds, such as scintillators, solid-state laser hosts, photocatalysts, gas and humidity sensors, optical bers and electronic materials. [6][7][8][9][10][11][12][13][14] In the past decade, various morphological ZnWO 4 nano/microstructures, such as rods, wires, hollow microspheres, hollow clusters and chrysanthemum-shape, have been synthesized through solidstate, precipitation, sol-gel, hydro/solvothermal and microwave routes.…”