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Metal-silver-supported titanium dioxide photocatalyst and preparation method thereof

A titanium dioxide and photocatalyst technology, applied in the field of composite material preparation, can solve the problems of difficult operation, cumbersome method, difficult to achieve uniform loading of precious metals, etc., and achieve the effects of uniform loading and high photocatalytic efficiency

Inactive Publication Date: 2014-06-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing methods for preparing metal silver-supported titanium dioxide photocatalyst materials mainly include chemical reduction, photodeposition and high-temperature calcination. Reductant reduction method, but its efficiency is low and difficult to operate; (2) High-temperature calcination method, mainly through decomposing metal salts in a high-temperature environment, and realizing the attachment and growth of metal nanoparticles on the surface of titanium dioxide, this method consumes a lot of energy , and it is not easy to achieve uniform loading of noble metals; (3) photodeposition method, which mainly uses light sources of different energies to irradiate noble metal salts to decompose them to achieve the effect of deposition. This method is cumbersome and requires strict reaction conditions

Method used

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  • Metal-silver-supported titanium dioxide photocatalyst and preparation method thereof
  • Metal-silver-supported titanium dioxide photocatalyst and preparation method thereof
  • Metal-silver-supported titanium dioxide photocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Add 1.0 mL of 0.1 mmol / L KCl solution into 300 mL of absolute ethanol, stir magnetically for 20 min, slowly drop in 5.4 mL of butyl titanate, stir vigorously for 10 min, age for 2 h, centrifuge and dehydrate with absolute ethanol Ionized water was washed sequentially to obtain a pure white powder. Disperse the pure white powder obtained above in 50mL of absolute ethanol, ultrasonically disperse for 20min, and add 10mL of AgNO with a concentration of 0.1g / 100mL to it. 3 The solution was magnetically stirred at a constant temperature at 35° C. for a certain period of time until the solution was evaporated to dryness, and a tan powder was obtained. The brown powder obtained above was calcined in an air atmosphere in a muffle furnace. The temperature rise system is 2°C / min before 300°C, 1°C / min from 300°C to 500°C, and kept at 500°C for 2 hours, and then naturally cooled to room temperature to obtain silver-loaded nano-titanium dioxide light. catalyst. figure 1 It is the...

Embodiment 2

[0032] Add 1.3 mL of KCl solution with a concentration of 0.8 mmol / L to 300 mL of absolute ethanol, stir magnetically for 20 min, slowly drop in 5.4 mL of butyl titanate, stir vigorously for 10 min, age for 1 h, centrifuge and dehydrate with absolute ethanol Ionized water was washed sequentially to obtain a pure white powder. Disperse the pure white powder obtained above in 40mL of absolute ethanol, ultrasonically disperse for 20min, and add 12mL of AgNO with a concentration of 1.3g / 100mL to it. 3 The solution was magnetically stirred at a constant temperature at 40° C. for a certain period of time until the solution was evaporated to dryness, and a tan powder was obtained. The brown powder obtained above was calcined in an air atmosphere in a muffle furnace. The temperature rise system is 2°C / min before 300°C, 1°C / min from 300°C to 500°C, and kept at 500°C for 2 hours, and then naturally cooled to room temperature to obtain silver-loaded nano-titanium dioxide light. catalys...

Embodiment 3

[0034] Add 1.5mL of 0.5mmol / L KCl solution into 300mL of absolute ethanol, stir magnetically for 20min, slowly drop in 5.4mL of butyl titanate, stir vigorously for 10min, age for 3h, centrifuge and dehydrate with absolute ethanol Ionized water was washed sequentially to obtain a pure white powder. Disperse the pure white powder obtained above in 45mL of absolute ethanol, ultrasonically disperse for 20min, and add 14mL of AgNO with a concentration of 0.8g / 100mL to it. 3 The solution was magnetically stirred at a constant temperature at 30° C. for a certain period of time until the solution was evaporated to dryness, and a tan powder was obtained. The brown powder obtained above was calcined in an air atmosphere in a muffle furnace. The temperature rise system is 2°C / min before 300°C, 1°C / min from 300°C to 500°C, and kept at 500°C for 2 hours, and then naturally cooled to room temperature to obtain silver-loaded nano-titanium dioxide light. catalyst. image 3 It is the degrad...

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Abstract

The invention discloses a metal-silver-supported titanium dioxide photocatalyst and a preparation method thereof. The photocatalyst material is composed of metal-silver-supported titanium dioxide microspheres, wherein the diameter of the titanium dioxide microspheres is 300-500nm; the supported metal silver is dispersed in the titanium dioxide microspheres in a bulk phase homogenization manner; the diameter of the metal silver particles is 5-15nm; and the photocatalyst material has very high photocatalysis efficiency for simulated organic pollutant rhodamine B in water body under the irradiation of ultraviolet and visible light. The preparation method is simple in process, safe to operate and low in cost; and all the used reagents are cheap and accessible, and are free of substances poisonous / harmful to human body or environment.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to a titanium dioxide-based photocatalytic material, in particular to a metal silver-loaded titanium dioxide photocatalyst, and also relates to a preparation method of the metal silver-loaded titanium dioxide photocatalyst. Background technique [0002] In recent years, titanium dioxide semiconductor photocatalytic materials have developed rapidly due to their cheap, easy-to-obtain, non-toxic, harmless, stable chemical properties, and strong photocorrosion resistance, and have been used in water pollution control, air purification, and antibacterial ceramics. The field has achieved huge economic benefits. However, in practical applications TiO 2 Photocatalytic degradation of organic pollutants has the disadvantages of high photogenerated carrier recombination rate, low quantum yield, and its own wide band gap, which cannot effectively use visible light, which h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50
Inventor 刘辉董晓楠李广军孙超超李军奇朱振峰
Owner SHAANXI UNIV OF SCI & TECH
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