Calcium Bismuthate Nanoparticulates with Orthorhombic and Rhombohedral Crystalline Lattices: Effects of Composition and Structure on Photoactivity

被引：15

作者：

Shtarev, Dmitry S. ^{[1
,4
]}

Ryabchuk, Vladimir K. ^{[2
]}

Makarevich, Konstantin S. ^{[3
]}

Shtareva, Anna V. ^{[1
]}

Blokh, Artem I. ^{[4
]}

Astapov, Ivan A. ^{[3
]}

Serpone, Nick ^{[5
]}

机构：

[1] Russian Acad Sci, Yu A Kosygin Inst Tecton & Geophys, Far Eastern Branch, 65 Kim Yu Chen St, Khabarovsk 680063, Russia

[2] St Petersburg State Univ, Dept Photon, VA Fock Fac Phys, Ulianovskaya 2, St Petersburg 198904, Russia

[3] Russian Acad Sci, Inst Mat Sci, Far Eastern Branch, 153 Tikhookeanskaya St, Khabarovsk 680042, Russia

[4] Far Eastern State Transport Univ, 47 Seryshev St, Khabarovsk 680021, Russia

[5] Univ Pavia, PhotoGreen Lab, Dipartimento Chim, Via Taramelli 12, I-27100 Pavia, Italy

来源：

CHEMISTRYSELECT | 2017年 / 2卷 / 30期

基金：

俄罗斯科学基金会;

关键词：

calcium bismuthate; materials science: general; orthorhombic lattice; photocatalysis; rhombohedral lattice; PHOTOCATALYST; NANOMATERIALS; DEGRADATION; TIO2; DISPERSIONS; GENERATION; EFFICIENCY; CABI6O10; HYDROGEN; OXYGEN;

D O I：

10.1002/slct.201702204

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Calcium bismuthate nanoparticles with orthorhombic and rhombohedral crystal lattices were synthesized and characterized by various techniques. The syntheses caused the formation of oxygen and cationic vacancies in bismuth-deficient samples. Heat treatment of samples with anionic vacancies led to thermal annealing of oxygen vacancies in ambient air; the annealing process was reversible. Oxygen vacancies in Bi-deficient CaBi6O10 governed the optical absorption beyond the fundamental absorption edge at E-(hv) < E-bg approximate to 2.5eV. Bandgap energies of the bismuthates with orthorhombic and rhombohedral lattices were 2.51eV prior to annealing and 2.47eV after annealing at 350 degrees C. The trend in photoactivity toward the degradation of methylene blue dye under visible light showed that the photoactivity of the orthorhombic samples (1-3) increased with a decrease in the [Ca]:[Bi] ratio (1.0:6.3 to 1.0:4.3); the sample with lowest ratio (1.0:4.3) displayed highest photoactivity. By contrast, the rhombohedral samples (4-6) showed increased photoactivity with increase in the number of Bi atoms; sample with highest ratio (1.0:6.3) displayed highest photoactivity.

引用

页码：9851 / 9863

页数：13

共 40 条

[1] Visible-light photocatalysis in nitrogen-doped titanium oxides [J].