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Preparation method and application of layered cesium titanium niobate and nitrogen-doped titanium dioxide hybrid core-shell structure photocatalyst

A technology of titanium dioxide and photocatalyst, which is applied in the field of photocatalysis, can solve the problems of lattice mismatch, low degree of hybridization, and low cost, and achieve the effects of low preparation cost, simple process, and low equipment requirements

Pending Publication Date: 2020-07-10
YANCHENG INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a preparation method and application of layered titanium cesium niobate@nitrogen-doped titanium dioxide hybrid core-shell structure photocatalyst, which uses TiO 2 and CsTi 2 NbO 7 with similar TiO 6 The characteristic of octahedral structure makes N-TiO 2 and CsTi 2 NbO 7 The lattice matching between the two phases can be realized to the greatest extent, which is conducive to effective hybridization between the two phases, thereby solving the shortcomings of different phases in the prior art such as lattice mismatch and low degree of hybridization, The method is low in cost and does not use noble metals, and the obtained layered titanium cesium niobate@nitrogen-doped titanium dioxide (CsTi 2 NbO 7 @N-TiO 2 ) Unique structure of heterojunction hybrid materials

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  • Preparation method and application of layered cesium titanium niobate and nitrogen-doped titanium dioxide hybrid core-shell structure photocatalyst
  • Preparation method and application of layered cesium titanium niobate and nitrogen-doped titanium dioxide hybrid core-shell structure photocatalyst
  • Preparation method and application of layered cesium titanium niobate and nitrogen-doped titanium dioxide hybrid core-shell structure photocatalyst

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Embodiment 1

[0032] A preparation method of layered titanium cesium niobate@nitrogen-doped titanium dioxide hybrid core-shell structure photocatalyst, comprising the following steps:

[0033] (1) Synthesis of CsTi by high-temperature solid-phase method 2 NbO 7 , that is, the raw material is analytically pure Cs 2 CO 3 , Nb 2 o 5 、TiO 2 Mix according to the ratio of the amount of substances 1.1:1:4, put it in a mortar and grind it fully, put the mixed and ground sample in a muffle furnace, the heating rate is 10 ℃ / min, at 750, 950, 1050 ℃, respectively Each was kept for 12 h. After the reaction, the powder was taken out, washed with deionized water until neutral, and dried in an oven at 80 °C for 12 h to obtain a white powder CsTi 2 NbO 7 .

[0034] (2) Weigh 2.0 g of prepared CsTi 2 NbO 7 , dispersed in 50 ml ethanol, sonicated for 30 min, and magnetically stirred in a sealed beaker for 4 h. After the resulting suspension was uniformly distributed, 3ml of titanium isopropoxide (...

Embodiment 2

[0037] Except titanium isopropoxide (Ti(O- i -Pr) 4 ) in a volume of 5ml, where TiO 2 with CsTi 2 NbO 7 Except that mass ratio is 0.7:1, other steps are with embodiment 1.

Embodiment 3

[0039] Except titanium isopropoxide (Ti(O- i -Pr) 4 ) has a volume of 7ml, where TiO 2 with CsTi 2 NbO 7 Except that mass ratio is 1:1, all the other are with embodiment 1.

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Abstract

The invention discloses a preparation method and application of a layered cesium titanium niobate and nitrogen-doped titanium dioxide hybrid core-shell structure photocatalyst. According to the method, TiO2 and CsTi2NbO7 have similar TiO6 octahedral structures so that lattice matching between two phases, namely N-TiO2 and CsTi2NbO7, can be realized to the greatest extent, effective hybridization between two phases is facilitated, and the defects that in the prior art, lattices of different phases are not matched, and the hybridization degree is low are overcome. The method is low in cost, precious metal is not used, and the obtained layered cesium titanium niobate and nitrogen-doped titanium dioxide heterojunction hybrid material is unique in structure. The obtained CsTi2NbO7 (at) N-TiO2 core-shell structure hybrid material widens the optical absorption range, also shows obviously enhanced visible light catalytic activity, has a reaction rate constant about 2.2 times that of CsTi2NbO7,has good photocatalytic cycling stability and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a preparation method and application of layered titanium cesium niobate@nitrogen-doped titanium dioxide hybrid core-shell structure photocatalyst. Background technique [0002] As a new technology that can solve energy shortage and environmental pollution, semiconductor photocatalysis technology has attracted widespread attention. However, the low quantum efficiency and low solar energy utilization limit the application of semiconductor photocatalysis. Therefore, designing and synthesizing new high-efficiency photocatalytic materials with visible light photoresponse is the current research focus in the field of photocatalysis. In recent years, more and more transition metal oxo-salt layered compounds have been applied in the field of semiconductor photocatalysis due to their good photocatalytic activity, excellent structural plasticity, good electronic conductivity and pho...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/30C02F101/38
CPCB01J27/24C02F1/30C02F2101/308C02F2101/40C02F2305/10B01J35/396B01J35/39Y02W10/37
Inventor 奚新国程婷董鹏玉高欣孟承启王艳陈小卫张蓓蓓李中钦
Owner YANCHENG INST OF TECH