Defect state of indium-doped bismuth molybdate nanosheets for enhanced photoreduction of chromium(vi) under visible light illumination.

Title Defect state of indium-doped bismuth molybdate nanosheets for enhanced photoreduction of chromium(vi) under visible light illumination.
Authors Z. Li; Z. Wu; S. Zhang; J. Shen; W. Feng; Y. Du; L. Wan; S. Zhang
Journal Dalton Trans
DOI 10.1039/c8dt01807c
Abstract

The construction of defect states is an effective method for regulating the energy band structure of photocatalytic semiconductor materials. Establishing defect states effectively is a particularly significant strategy to improve the photoelectric conversion efficiency. Herein, we report a peculiar method to manufacture defect states in indium-doped Bi2MoO6 by changing the valence state of the doped indium element. By increasing the amount of doped indium, different doping forms and valence states are produced, which causes distortion of crystal structure, generation of oxygen vacancies and variation in the elemental valence state. Specifically, when Bi is substituted with In(3-x)+, the acceptor energy level becomes higher than the valence band due to the p-type-like doping, which widens the width of the valence band and drives the up-shift of the valence band edges, resulting in narrowed bandgap and improved photoresponse ability. In addition, the photoelectrochemical performance tests using the In-doped Bi2MoO6 show that low-valent indium doping effectively improves the carrier separation efficiency, reduces the transmission impedance, and greatly improves the photocatalytic reduction performance of Cr(vi). This study provides a new insight to the design of efficient photocatalysts for the green and sustainable treatment of Cr(vi) pollution.

Citation Z. Li; Z. Wu; S. Zhang; J. Shen; W. Feng; Y. Du; L. Wan; S. Zhang.Defect state of indium-doped bismuth molybdate nanosheets for enhanced photoreduction of chromium(vi) under visible light illumination.. Dalton Trans. 2018. doi:10.1039/c8dt01807c

Related Elements

Molybdenum

See more Molybdenum products. Molybdenum (atomic symbol: Mo, atomic number: 42) is a Block D, Group 6, Period 5 element with an atomic weight of 95.96. Molybdenum Bohr ModelThe number of electrons in each of molybdenum's shells is [2, 8, 18, 13, 1] and its electron configuration is [Kr] 4d5 5s1. The molybdenum atom has a radius of 139 pm and a Van der Waals radius of 209 pm. In its elemental form, molybdenum has a gray metallic appearance. Molybdenum was discovered by Carl Wilhelm in 1778 and first isolated by Peter Jacob Hjelm in 1781. Molybdenum is the 54th most abundant element in the earth's crust. Elemental MolybdenumIt has the third highest melting point of any element, exceeded only by tungsten and tantalum. Molybdenum does not occur naturally as a free metal, it is found in various oxidation states in minerals. The primary commercial source of molybdenum is molybdenite, although it is also recovered as a byproduct of copper and tungsten mining. The origin of the name Molybdenum comes from the Greek word molubdos meaning lead.

Bismuth

See more Bismuth products. Bismuth (atomic symbol: Bi, atomic number: 83) is a Block P, Group 15, Period 6 element with an atomic radius of 208.98040. The number of electrons in each of Bismuth's shells is 2, 8, 18, 32, 18, 5 and its electron configuration is [Xe] 4f14 5d10 6s2 6p3. Bismuth Bohr ModelThe bismuth atom has a radius of 156 pm and a Van der Waals radius of 207 pm. In its elemental form, bismuth is a silvery white brittle metal. Bismuth is the most diamagnetic of all metals and, with the exception of mercury, its thermal conductivity is lower than any other metal. Elemental BismuthBismuth has a high electrical resistance, and has the highest Hall Effect of any metal (i.e., greatest increase in electrical resistance when placed in a magnetic field). Bismuth is found in bismuthinite and bismite. It is also produced as a byproduct of lead, copper, tin, molybdenum and tungsten extraction. Bismuth was first discovered by Early Man. The name Bismuth originates from the German word 'wissmuth,' meaning white mass.

Indium

See more Indium products. Indium (atomic symbol: In, atomic number: 49) is a Block P, Group 13, Period 5 element with an atomic weight of 114.818. The number of electrons in each of indium's shells is [2, 8, 18, 18, 3] and its electron configuration is [Kr] 4d10 5s2 5p1. The indium atom has a radius of 162.6 pm and a Van der Waals radius of 193 pm. Indium was discovered by Ferdinand Reich and Hieronymous Theodor Richter in 1863. Indium Bohr ModelIt is a relatively rare, extremely soft metal is a lustrous silvery gray and is both malleable and easily fusible. It has similar chemical properties to Elemental Indiumgallium such as a low melting point and the ability to wet glass. Fields such as optics and microelectronics that utilize semiconductor technology have wide uses for indium, especially in the form of Indiun Tin Oxide (ITO). Thin films of Copper Indium Gallium Selenide (CIGS) are used in high-performing solar cells. Indium's name is derived from the Latin word indicum, meaning violet.

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