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Nano noble metal modified Ag/MXene/TiO2 composite material and preparation method thereof

A technology of composite materials and precious metals, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as photocatalytic properties that are rarely studied, and achieve easy control, low cost, and improved photoresponse Effect

Pending Publication Date: 2020-06-09
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, little research has been done on TiO 2 , MXene and noble metal ternary doping system photocatalytic performance

Method used

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  • Nano noble metal modified Ag/MXene/TiO2 composite material and preparation method thereof
  • Nano noble metal modified Ag/MXene/TiO2 composite material and preparation method thereof
  • Nano noble metal modified Ag/MXene/TiO2 composite material and preparation method thereof

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Embodiment 1

[0028] Weigh 1 g Ti 3 AlC 2 The powder was dispersed in 10 mL of 49% HF solution, then placed in polytetrafluoroethylene, and reacted at 60 °C for 24 h. The resulting powder was washed with deionized water to a pH of about 7, and washed three times with ethanol centrifugation, and finally the product was vacuum-dried at 60 °C for 24 h to obtain MXene powder. Weigh 0.25 mmol AgNO 3 and 3.28 mmol MXene were dissolved in 50 mL deionized water, mixed, and ultrasonicated for 30 min to obtain A solution. Weigh 0.25 mmol of SnCl 2 and 0.5 mmol of CF 3 COOH solution was dissolved in 3 mL of formaldehyde and 7 mL of deionized water, and ultrasonicated for 30 min to obtain solution B. The prepared solution B was slowly dropped into the solution A to mix well, ultrasonicated for 30 min, washed by centrifugation, and dried in vacuum to prepare nano-Ag modified Ag / MXene composites. Weigh 100 mgAg / MXene complex and 0.165 g NaBF 4 Dissolved in 15mL of 1M HCl, hydrothermally reacted a...

Embodiment 2-4

[0032] Other steps remain unchanged, the mass percentages of Ag added are 1%, 5% and 10%, respectively, and Ag / MXene / TiO 2 composite photocatalyst. The specific formula is shown in Table 2. In addition, the reaction temperature and time were changed between 120-220 ℃ and 1-36 h, respectively.

[0033] MXene, Ag / MXene composite and Ag / MXene / TiO obtained in above-mentioned embodiments 1 ~ 4 2 The composites were analyzed by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and ultraviolet-visible spectroscopy (UV-vis).

[0034] figure 1 For MXene, 5%Ag / MXene, MXene / TiO 2 and 5%Ag / MXene / TiO 2 SEM images of samples. From figure 1 a It can be seen that MXene has a clear lamellar shape and a good layering effect. figure 1 b It can be observed that more uniform Ag nanoparticles are deposited on the surface of MXene, and Ag nanoparticles grow between layers of MXene. After hydrothermal reaction, in MXene ( figure 1 c) and 5%Ag / MXene ( figure 1 d)...

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Abstract

The invention discloses a nano noble metal modified Ag / MXene / TiO2 composite material and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing a two-dimensional lamellar material MXene with a good lamellar structure; ultrasonically and uniformly dispersing MXene into an AgNO3 aqueous solution; then adding a formaldehyde aqueous solution containingstannous chloride (SnCl2) and trifluoroacetic acid (CF3COOH) to obtain an MXene composite material with uniformly distributed nano-Ag, and finally, separating out TiO2 sheets on the surface of the MXene by adopting a hydrothermal method to obtain the nano-Ag modified MXene / TiO2 composite material. The nano Ag and TiO2 sheets in the composite material are uniformly dispersed, the proportion of thenano Ag and TiO2 sheets is adjustable, and the photocatalytic performance of the composite material is greatly improved compared with that of commercial TiO2(P25). The addition of nano Ag enhances theabsorption of the composite material in a visible band, and the Ag / MXene / TiO2 ternary composite material has potential application in the field of photoelectrocatalysis as a catalyst material.

Description

technical field [0001] The present invention relates to a kind of Ag / MXene / TiO modified by nanometer noble metal 2 Composite materials and methods for their preparation. Background technique [0002] Environmental pollution and energy shortage are the main problems facing mankind today. Therefore, human beings have been devoting themselves to finding simple and efficient catalysts to purify water resources and obtain clean energy. Such as degradation of organic pollutants in water, catalytic decomposition of water to obtain clean energy hydrogen and reduction of greenhouse gas carbon dioxide, etc. Such as two-dimensional materials (MXene, graphene, MoS 2 、TiO 2 Sheets, etc.) and their composite materials have been extensively studied in the above application fields. [0003] Titanium dioxide (TiO 2 ) as a common wide bandgap semiconductor (anatase TiO 2 The band gap of 3.2 eV) has been widely used in the field of photocatalysis due to its low price, non-toxicity, stab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22
CPCB01J27/22B01J35/396B01J35/39
Inventor 叶晓云陈龙黄培金刘雪华陈金香林永南王乾廷陈文哲陈丁桂
Owner FUJIAN UNIV OF TECH
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