Composite photocatalyst, its preparation and application

A technology of catalyst and composite light, which is applied in the field of high-efficiency photocatalytic nanomaterials, novel, and organic wastewater treatment. It can solve the problems of easy recombination of photogenerated electrons and holes, poor adsorption capacity of organic matter, and insufficient specific surface area, so as to improve electron conduction. ability and photoelectric conversion efficiency, enhanced adsorption capacity, and effects of high photoelectric conversion characteristics

Inactive Publication Date: 2013-03-13
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to TiO 2 The wide band gap can only absorb ultraviolet light, photogenerated electrons and holes are easy to recombine, the specific surface area is not large enough, and the adsorption capacity of organic matter is poor, etc. These shortcomings limit its practical application in environmental governance.

Method used

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  • Composite photocatalyst, its preparation and application
  • Composite photocatalyst, its preparation and application
  • Composite photocatalyst, its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Polishing the surface of the pure titanium base material, cleaning it for later use;

[0031] (2) Preparation of organic electrolyte: the electrolyte is composed of 0.1MNaF and 0.5MNaHSO 4 The composition of the aqueous solution;

[0032] (3) Under 15V DC voltage, with pure titanium sheet as anode and platinum sheet as cathode, titanium oxide nanotubes are electrolyzed in electrolyte;

[0033] (4) Calcining the titanium dioxide nanotube array prepared above under aerobic conditions at 400°C-500°C for more than 3h to crystallize it into TiO 2 array of nanotubes.

[0034] (5) Preparation of graphene-PbS modified titania nanotube arrays:

[0035] Put the above TiO 2 Nanotube arrays were placed in 30ml containing 1mM Pb(NO 3 ) 2 , 1 mM Na 2 S 2 o 3 and 0.4mg mL -1 In the graphene oxide solution, the standard three-electrode system was used to electrodeposit TiO on the CHI 660D electrochemical workstation by cyclic voltammetry. 2 On nanotube arrays, graphene-P...

Embodiment 2

[0039] Graphene-PbS / TiO 2 Nanotube Array Photocatalytic Degradation of Pentachlorophenol

[0040] We use pure TiO 2 Nanotube arrays and modified TiO 2 Nanotube arrays were used to degrade 10mg / L pentachlorophenol wastewater.

[0041] Implementation steps:

[0042]1. Graphene-PbS / TiO with an effective electrode area of ​​3cm×2cm 2 The composite nanotube array electrode was immersed in 50mL of pentachlorophenol wastewater with a concentration of 10mg / L;

[0043] 2. Use a Xe lamp with a light source of 500W (100mW / cm 2 ), simulating sunlight to photocatalytically degrade it;

[0044] 3. After regular sampling, use a UV-visible spectrophotometer to monitor the change of pentachlorophenol concentration in the solution;

[0045] 4. Control experiment on unmodified TiO 2 Carry out on materials such as nanotube arrays, and the steps are the same as above.

[0046] Figure 4 Curve 1 shows that the direct photolysis efficiency of pentachlorophenol is about 54%. Curve 2 is for...

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Abstract

The invention relates to a composite photocatalyst, its preparation and application. In the invention, a graphene-PbS/TiO2 nano-composite material is adopted. Graphene and PbS semiconductor nanoparticles are compounded on an outer surface of a titanium dioxide nanotube array, an opening of the nanotube array and an inner surface through electrodeposition, thus obtaining the composite material. The novel nano-material graphene-PbS/TiO2 with efficient environmental functions can be used as a photocatalyst, and has excellent performance in treatment of organic pollutant wastewater.

Description

Technical field: [0001] The invention relates to a novel and highly efficient photocatalytic nanomaterial—graphene-PbS / TiO 2 Nanotube array preparation and organic wastewater treatment. Background technique: [0002] Titanium dioxide (TiO 2 ) photocatalyst has the advantages of stable chemical properties, high catalytic activity, low cost and light resistance, and has photocatalytic degradation effect on organic pollutants, and has been widely used in the field of environmental protection. Titanium dioxide nanotube arrays prepared by anodic oxidation have attracted the attention of scientists at home and abroad because of their excellent properties such as large specific surface area and adjustable pore size, as well as their special nanotube-like structure. However, due to TiO 2 The wide band gap can only absorb ultraviolet light, the photogenerated electrons and holes are easy to recombine, the specific surface area is not large enough, and the adsorption capacity of or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J37/34C02F1/30C02F101/36
CPCY02W10/37
Inventor 罗胜联刘承斌张锡霖唐艳红滕雅蓉杨琼王尧刘选能
Owner HUNAN UNIV
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