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A kind of in-situ growth potassium niobate material on the surface of vermiculite and its preparation method

An in-situ growth, potassium niobate technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve cost constraints, high recovery and recycling, The effective surface area and photocatalytic efficiency are weakened, so as to achieve the effect of improved photodegradation performance and high recycling cost.

Active Publication Date: 2017-10-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems to be solved in the process of photocatalytic degradation using only potassium niobate powder
The disadvantage is that the fine potassium niobate particles are easy to agglomerate in the suspension, which will make the effective surface area and photocatalytic efficiency of the photocatalytic material sharply weaken during the photoreaction process.
Moreover, the high cost of this photocatalytic powder material in terms of storage, recovery, and recycling limits its practical application.

Method used

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  • A kind of in-situ growth potassium niobate material on the surface of vermiculite and its preparation method
  • A kind of in-situ growth potassium niobate material on the surface of vermiculite and its preparation method
  • A kind of in-situ growth potassium niobate material on the surface of vermiculite and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The exfoliated vermiculite was soaked in ethanol for 12h, washed with deionized water and dried for later use. In a 250ml reactor, dissolve 39.2g KOH in 30ml deionized water, stir to dissolve completely until the solution is clear. Get 0.5g of treated vermiculite and place it in the above reaction vessel, then add 1.84g of NbCl 5, stirred at room temperature for 30 minutes. After the stirring is completed, transfer the reaction liquid into an 80ml reaction kettle, and react at a constant temperature of 180°C for 12 hours. After the solution is cooled, take out the vermiculite, rinse it repeatedly with deionized water, and dry it at 60°C for 24 hours to obtain KNbO 3 / VMT.

[0026] Characterization of its structure as Figure 1-5 As shown, it shows that the needle-like structure formed on the surface of vermiculite is potassium niobate.

Embodiment 2

[0028] The exfoliated vermiculite was soaked in ethanol for 12 hours, washed with deionized water and dried for later use. In a 250ml reactor, dissolve 39.2g KOH in 50ml deionized water, stir to dissolve completely until the solution is clear. Get 1g of treated vermiculite and place it in the above reaction vessel, then add 1.84g NbCl 5 , stirred at room temperature for 30 minutes. After the stirring is completed, transfer the reaction solution into an 80ml reaction kettle, and react at a constant temperature of 200°C for 18 hours. After the solution is cooled, take out the vermiculite, rinse it repeatedly with deionized water, and dry it at 60°C for 24 hours to obtain KNbO 3 / VMT.

Embodiment 3

[0030] The exfoliated vermiculite was soaked in ethanol for 12 hours, washed with deionized water and dried for later use. In a 250ml reactor, dissolve 39.2g KOH in 70ml deionized water, stir to dissolve completely until the solution is clear. Get 1.5g of processed vermiculite and place it in the above reaction vessel, then add 1.84g of NbCl 5 , stirred at room temperature for 30 minutes. After the stirring is completed, transfer the reaction solution into a 100ml reaction kettle, and react at a constant temperature of 160°C for 24 hours. After the solution is cooled, take out the vermiculite, rinse it repeatedly with deionized water, and dry it at 60°C for 24 hours to obtain KNbO 3 / VMT.

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Abstract

The invention relates to a vermiculite surface in-situ grown potassium niobate material and a preparation method thereof.The preparation method includes: adopting a one-step hydrothermal method; placing vermiculite in a solution containing potassium hydroxide and niobium pentachloride; controlling nucleation and growth of KNbO3 on vermiculite by controlling reaction temperature and time, wherein potassium niobate grows on the surfaces of inner and outer layers of two-dimensional layered vermiculite in-situ through a one-dimensional needle-like structure to form a KNbO3 / VMT material of a three-dimensional material, and KNbO3 and vermiculite interact through chemical bonds, so that adhesion force is large.The preparation method is simple and convenient in process.The material can be used as a photocatalytic material.The problem that reaction raw materials are prone to loss, difficult to store and separate and high in recovery cost due to the fact that only KNbO3 powder can be adopted as a catalyst in the past is solved.

Description

Technical field: [0001] The invention relates to a photocatalytic degradation material and a preparation method thereof, in particular to a potassium niobate / vermiculite material and a preparation method thereof. Background technique: [0002] With the rapid development of the global industrialization process, a large amount of wastewater containing organic pollutants produced in the printing and dyeing industry, paper industry, etc. is directly discharged into the natural environment, causing a series of serious environmental pollution problems. Generally speaking, these organic pollutants, such as dyes, are difficult to degrade naturally. Therefore, semiconductor materials can be used as photocatalysts to eliminate pollutants that are difficult to remove in these water bodies. In order to solve this environmental pollution problem, a great deal of research has been conducted to synthesize novel semiconductor-based photocatalysts. Among these studied photocatalysts, perov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/20C02F1/30C02F101/38
CPCB01J23/002B01J23/20B01J35/004C02F1/30C02F2101/308C02F2101/40C02F2305/10
Inventor 雷晓东王雨薇田维亮孔祥贵夏梦棋张东彬
Owner BEIJING UNIV OF CHEM TECH
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