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Non-metal-doped porous wall titanium nano-tube array visible light catalyst, preparation method and applications thereof

A titanium nanotube and non-metallic technology, which is applied in the preparation of non-metallic doped porous-walled titanium nanotube array visible light catalyst and the application field of environmental treatment, which can solve the problem of low sunlight utilization rate of pure titanium nanotube array and noble metal electrodes. High cost, unstable doping amount and other issues, to achieve the effect of improved visible light catalytic activity, high light utilization rate, adsorption and mass transfer efficiency, and rich pore structure

Active Publication Date: 2018-05-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the high cost of noble metal electrodes used in the existing anodic oxidation technology, the pure titanium nanotube array only responds to ultraviolet light, the tube wall is dense, the utilization rate of sunlight is low, and the non-metallic post-doping modification technology is faced. Due to the shortcomings of high equipment requirements and unstable doping amount, a simple preparation method of non-metal doped porous-walled titanium nanotube array visible light catalyst and its application in environmental treatment are provided.

Method used

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  • Non-metal-doped porous wall titanium nano-tube array visible light catalyst, preparation method and applications thereof
  • Non-metal-doped porous wall titanium nano-tube array visible light catalyst, preparation method and applications thereof
  • Non-metal-doped porous wall titanium nano-tube array visible light catalyst, preparation method and applications thereof

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Titanium alloy pretreatment: Take a 20mm×30mm×2mm pure titanium sheet coated with a TiN coating with a thickness of 10 μm, put it into absolute ethanol and deionized water for 20 minutes each, and dry at room temperature.

[0032] (2) Anodizing: Two-electrode system is used, the cathode is pure titanium sheet (effective area 400mm 2 ), the anode is the pure titanium sheet coated with TiN coating after the step (1) treatment, and the area to be anodized is 2 × 400mm 2 , the distance between the two electrodes is 3cm, and the electrolyte is 0.5wt% NH 4 F, 2vol%H 2O in ethylene glycol solution 60mL. Oxidation was carried out at 70V DC constant voltage for 3h, and the initial temperature of the electrolyte was 20°C. Soak in absolute ethanol for 20-40 minutes, then dry naturally at room temperature to obtain amorphous N-doped TiO 2 array of nanotubes.

Embodiment 2

[0034] (1) Titanium alloy pretreatment: Take a 20mm×30mm×2mm pure titanium sheet coated with a TiC coating with a thickness of 10 μm, put it into anhydrous ethanol and deionized water for 20 minutes each, and dry at room temperature.

[0035] (2) Anodizing: Two-electrode system is used, the cathode is pure titanium sheet (effective area 400mm 2 ), the anode is the pure titanium sheet coated with TiC coating after the step (1) treatment, and the area to be anodized is 2 × 400mm 2 , the distance between the two electrodes is 3cm, and the electrolyte is 0.5wt% NH 4 F, 2vol%H 2 O in ethylene glycol solution 60mL. Oxidize for 3 hours under 70V DC constant voltage, the initial temperature of the electrolyte is 20°C, no need to maintain constant temperature. Soak in absolute ethanol for 20-40min, then dry naturally at room temperature to obtain amorphous C-doped TiO 2 array of nanotubes.

Embodiment 3

[0037] (1) Preparation of anatase N-doped porous-walled titanium nanotube arrays: the amorphous N-doped TiO prepared in Example 1 2 The nanotube arrays were calcined in a muffle furnace at 500°C for 2 hours in an air atmosphere. The temperature rise program is to rise from room temperature to 250°C at a rate of 2°C / min, keep the temperature at 250°C for 30 minutes, then rise to 500°C at a rate of 1°C / min, keep the temperature for 2 hours, and finally drop to room temperature at a rate of 3°C / min , to obtain anatase N-doped porous-walled titanium nanotube arrays, denoted as N-TNTAs.

[0038] (2) Preparation of anatase C-doped porous-walled titanium nanotube arrays: the amorphous C-doped TiO prepared in Example 2 2 The nanotube arrays were calcined in a muffle furnace at 500°C for 2 hours in an air atmosphere. The temperature rise program is to rise from room temperature to 250°C at a rate of 2°C / min, keep the temperature at 250°C for 30 minutes, then rise to 500°C at a rate o...

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Abstract

The invention discloses a non-metal-doped porous wall titanium nano-tube array visible light catalyst, a preparation method and applications thereof. According to the present invention, a titanium sheet with a plated metal ceramic coating is subjected to anode oxidation, calcination is performed, and partial non-metal elements are removed in the form of gas by adjusting the calcining parameters soas to prepare the non-metal-doped porous wall titanium nano-tube array visible light catalyst; the non-metal-doped porous wall titanium nano-tube array visible light catalyst has the regular and independent tube wall array structure, the tube wall multi-level pore channels and other special morphologies, can achieve good visible light response, and can provide fast electronic transmission channels and good adsorption and mass transfer performance, wherein the visible light catalytic performance is significantly enhanced compared to the smooth tube wall pure titanium nano-tube array, and the solar light utilization efficiency and the photoelectron hole separation ability are substantially improved; and the prepared photocatalyst can be widely used in the fields of photocatalytic and photoelectrocatalytic wastewater treatment, atmospheric purification and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental functional materials, and in particular relates to a preparation method of a non-metal doped porous wall titanium nanotube array visible light catalyst and its application in environmental treatment. Background technique [0002] The environment and energy are major issues facing and urgently to be solved by mankind in the 21st century. TiO 2 The representative photocatalytic technology has become an ideal environmental pollution control technology and clean energy production technology due to its unique properties such as deep reaction at room temperature and direct use of solar energy as a light source to drive the reaction. The morphology and structure of semiconductor photocatalysts play an extremely important role in their maximum catalytic effect. In recent years, TiO with various morphologies 2 Materials such as nanotubes, wires, sheets, hollow spheres, and three-dimensional interco...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J35/10B01J37/34C02F1/30B01D53/86
CPCB01D53/86C02F1/30B01J21/063B01J37/348C02F2305/10B01J35/39B01J35/61
Inventor 胡芸游素珍韦朝海
Owner SOUTH CHINA UNIV OF TECH
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