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Preparation method of Au-Pd/TiO2 NBs photocatalyst

A photocatalyst, au-pd technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as unfavorable separation and small particle size, and achieve Promote rapid transfer, improve absorption, and mild reaction conditions

Active Publication Date: 2015-04-08
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the deficiencies in the prior art, providing a kind of Au-Pd / TiO 2 NBs (Au-Pd bimetallic nanoparticles modified TiO 2 The preparation method of nanobelt) photocatalyst, the Au-Pd / TiO that adopts this method preparation 2 NBs photocatalyst has a large accessible surface area and visible light activity, and overcomes the disadvantages that are not conducive to separation from water, and the Au-Pd bimetallic nanoparticles are uniformly distributed and small in size

Method used

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  • Preparation method of Au-Pd/TiO2 NBs photocatalyst

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Embodiment 1

[0018] A kind of Au-Pd / TiO 2 The preparation method of NBs photocatalyst, the steps are as follows:

[0019] 1. TiO 2 Preparation of NBs: using titanium sheet as the substrate, anodizing the titanium sheet to prepare TiO 2 NBs, the electrolyte is ethylene glycol plus water 19:1 (v / v), the content of ammonium fluoride is 0.5wt%, the applied voltage is 60V, the oxidation time is 3h, before anodizing, the titanium sheet is ultrasonicated in ethanol and acetone respectively Wash for 10 minutes, then pickle for 30 seconds, rinse with deionized water, and dry in air at 100°C. Anodic oxidation uses a two-electrode system, and calcines in air at 540°C for 1 hour;

[0020] 2. Modification of Au-Pd bimetallic nanoparticles: TiO prepared in step 1 2 NBs were modified with Au-Pd bimetallic nanoparticles using a three-electrode system, TiO 2 NBs is the cathode, the platinum sheet is the anode, the SCE electrode is the reference electrode, 0.1mM chloroauric acid and palladium chloride a...

Embodiment 2

[0024] A kind of Au-Pd / TiO 2 The preparation method of NBs photocatalyst, the steps are as follows:

[0025] 1. TiO 2 Preparation of NBs: TiO was prepared by anodizing a 9mm×40mm×0.5mm titanium sheet 2 NBs, the electrolyte solution is ethylene glycol plus water (19:1v / v), the ammonium fluoride content is 0.4wt%, the applied voltage is 60V, and the oxidation time is 4h. Before anodizing, the titanium sheet was ultrasonically cleaned in ethanol and acetone for 10 min, and then acid-washed for 30 s (HF:HNO 3 :H 2 O=1:4:5), rinsed with deionized water, and dried in air at 105°C. Anodizing uses a two-electrode system. The prepared samples were calcined at 550 °C for 2 h in air.

[0026] 2. Modification of Au-Pd bimetallic nanoparticles: on prepared TiO 2 NBs were modified with Au-Pd bimetallic nanoparticles using a three-electrode system, TiO 2 NBs is the cathode, the platinum sheet is the anode, the SCE electrode is the reference electrode, 0.1mM chloroauric acid and palla...

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Abstract

The invention discloses a preparation method of an Au-Pd / TiO2 NBs photocatalyst, which comprises the following steps: with a titanium sheet as a matrix, performing anodic oxidation treatment on the titanium sheet to prepare TiO2NBs; before anodic oxidation, performing ultrasonic cleaning of the titanium sheet in ethanol and acetone respectively, performing acid pickling, washing with deionized water and drying, wherein a two-electrode system is adopted for the anodic oxidation; calcining in air; modifying the TiO2NBs prepared in the step I with Au-Pd bimetallic nanoparticles; adopting a three-electrode system in which chloroauric acid and a palladium chloride aqueous solution are used as Au and Pd sources; and depositing Au and Pd in turn and drying. The photocatalyst prepared by the method disclosed by the invention is fixed on the titanium matrix, the water body pollution caused by non-thorough recovery is avoided, a contactable surface area is larger, the contact reaction between organic pollutant molecules and the photocatalyst is facilitated, the photocatalytic degradation property of the photocatalyst is remarkably promoted, reaction conditions are mild, and the process flow is simple and easy to control.

Description

technical field [0001] The present invention relates to a kind of preparation method of photocatalyst, relate in particular to a kind of Au-Pd / TiO 2 Preparation method of NBs photocatalyst. Background technique [0002] TiO 2 Due to its high photocatalytic activity, stable physical and chemical properties, non-toxic side effects, and low cost, photocatalysts are considered to be the most promising materials for removing organic pollutants in water and air in the environment. Studies have shown that TiO 2 Photocatalysts can degrade most organic compounds, such as aromatic hydrocarbons, halogenated hydrocarbons, nitrogen-containing heterocyclic compounds, etc. Therefore, using TiO 2 The photocatalytic oxidation of organic pollutants in water and the atmosphere has become one of the hotspots in the field of photocatalytic research at home and abroad. However TiO 2 There are still many obstacles to the practical application of photocatalysts, thus, the preparation of an eff...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J35/02C25D11/26C25D15/00C02F1/30C02F101/38
CPCY02W10/37
Inventor 陈清华辛言君
Owner QINGDAO AGRI UNIV
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