Preparation method of visible light catalytic material with adjustable BiOI-AgI spherical solid solution

A photocatalytic material and solid solution technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of easy deactivation, and the photocatalytic performance of BiOI photocatalyst needs to be strengthened, so as to achieve easy separation , easy to synthesize in large quantities, and improve the effect of photocatalytic performance

Active Publication Date: 2013-04-24
江苏奥净嘉环保科技有限公司
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Problems solved by technology

[0003] According to our current research results: although the initial photocatalytic performance of AgI photocatalyst is high, it is easy to deactivate during the photocatalytic process, while the photocatalytic performance of BiOI photocatalyst still needs to be strengthened.

Method used

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  • Preparation method of visible light catalytic material with adjustable BiOI-AgI spherical solid solution
  • Preparation method of visible light catalytic material with adjustable BiOI-AgI spherical solid solution
  • Preparation method of visible light catalytic material with adjustable BiOI-AgI spherical solid solution

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Embodiment 1

[0032] The preparation method of band-tunable BiOI-AgI spherical solid solution visible light photocatalyst includes the following steps: 1) Preparation of BiOI flake microspheres: Dissolve 0.531 g of potassium iodide in 40 ml of ethylene glycol to form a uniform solution, and its potassium iodide The molar concentration of bismuth ion is 0.08 mol / L; dissolve 1.552 g of bismuth nitrate in 40 ml of ethylene glycol to form a homogeneous solution, and then add 0.016 g of PMMA to stir evenly. The molar concentration of bismuth ion is 0.08 mol / L, and the concentration of PMMA 0.4 g / L; under the condition of constant stirring, slowly add the potassium iodide solution obtained above to the bismuth nitrate solution containing PMMA inducer, and stir at room temperature for 6 hours to obtain a yellow transparent solution, and then slowly add 80 ml of deionized water , Precipitate the brick red BiOI precipitate, rinse with deionized water and absolute ethanol for 3 times, and then vacuum d...

Embodiment 2

[0041] To further test AgNO 3 Influence of concentration on the morphology and photocatalytic performance of BiOI-AgI spherical solid solution photocatalyst, except for AgNO 3 Except for different concentrations, other reaction conditions are as follows: AgNO 3 The volume of the solution (8.6 ml), standing reaction time (10 hours), drying temperature (50°C), drying time (2 hours), calcination temperature (350°C), calcination time (1 hour), etc. are the same as those in Example 1. the same. The results show that when AgNO 3 When the concentrations were 0.001, 0.0025, 0.05 and 0.1 mol / L, the degradation rates of the obtained BiOI-AgI spherical solid solution samples to methyl orange were 0.013, 0.017, 0.016 and 0.011 min, respectively -1 . The main reason is: when AgNO 3 When the concentration is lower than 0.001 mol / L, due to Ag + If the concentration is too low, the generated AgI content is too small, so the photocatalytic degradation performance is weak; when AgNO 3 When the co...

Embodiment 3

[0043] In order to examine the effect of the standing reaction time on the morphology and photocatalytic performance of the band-tunable BiOI-AgI spherical solid solution photocatalyst, in addition to the different standing reaction time, other reaction conditions are as follows: AgNO 3 Concentration (0.005 mol / L), AgNO 3 The volume of the solution (8.6 ml), drying temperature (50°C), drying time (2 hours), calcination temperature (350°C), calcination time (1 hour), etc. are the same as those in Example 1. The results show that when the standing time is less than 1 hour, AgNO 3 Ag in solution + [BiO + ] Insufficient exchange; when the standing time is 3, 8, 12, and 24 hours, the morphology and photocatalytic performance of the BiOI-AgI solid solution photocatalyst with flaky microsphere structure have no obvious influence. The rate constants of catalytic degradation are all 0.035-0.040 min -1 between. Therefore, in the synthesis process of BiOI-AgI spherical solid solution photo...

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Abstract

The invention relates to a preparation method of a visible light catalytic material with an adjustable BiOI-AgI spherical solid solution. The preparation method comprises the following steps of adding 1g of BiOI tablet-shaped microsphere into 8.6ml of AgNO3 solution, uniformly stirring, standing and aging for a period at room temperature, filtering the sediment, washing and drying in vacuum, putting into a muffle furnace of 100-500 DEG C to carry out thermal treatment for 0.5-5 hours so as to obtain the materials. The preparation method has the beneficial effects that the operation is simple, only the BiOI tablet-shaped sphere needs to be added into the prepared AgNO3 solution at room temperature to be kept for a certain period, but no organic surface active agents, additives and template agents need to be added; and meanwhile the whole reaction process only needs ordinary glass instruments such as flasks, so that the preparation method requires lowly in equipment (a baking oven and a high temperature furnace are enough), various expensive machining and synthetic equipment and high-temperature high-pressure reaction devices are not required, and the preparation method has the advantage that large-scale synthesis is easy to carry out.

Description

technical field [0001] The invention relates to a preparation method of an adjustable energy band BiOI-AgI spherical solid solution visible light photocatalyst. technical background [0002] With the rapid development of the world economy, energy problems and environmental crises are becoming more and more serious. As an environmentally friendly high-tech, photocatalysis can not only completely and effectively degrade organic pollutants and harmful gases, but also generate clean hydrogen energy. Therefore, it is of great development significance in the context of the country's sustainable development strategy. In recent decades, in order to effectively utilize solar energy, scientists have researched and developed various types of high-efficiency visible light photocatalytic materials. TiO in the traditional sense 2 Photocatalysts have narrow visible light response range and low quantum efficiency. Although noble metal photocatalytic materials have high performance, they a...

Claims

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Application Information

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IPC IPC(8): B01J27/08B01J35/08B01J37/08B01J37/30
Inventor 余火根刘莉王雪飞王苹余家国
Owner 江苏奥净嘉环保科技有限公司
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