Method for preparing expanded graphite load nanometer bismuth vanadate photochemical catalyst

Abstract

The invention relates to a method for preparing expanded graphite load nanometer bismuth vanadate photochemical catalyst, which comprises the following steps: 1 adding bismuthate and stabilizing agent into phosphate buffer, stirring for 15 to 60 minutes to form turbid liquid, dissolving metavanadate into the phosphate buffer uniformly, adding the phosphate buffer into the turbid liquid, and stirring the solution to be uniform to form transparent solution; and 2 regulating potential of hydrogen (pH) value through alkaline solution, adding expanded graphite at the temperature of 20 DEG C to 100 DEG C, stirring, mixing, refluxing for 6 hours to 24 hours, centrifuging, filtering, washing, finally roasting the obtained products, cooling and grinding to obtain the final product. The method is low in cost, easy to apply and good in maneuverability and has low requirements for devices. The obtained expanded graphite powder bismuth vanadate is even in self-assembly, can efficiently degrade durable toxic and harmful substances under conditions of ultraviolet light and visible light, can be recovered and recycled easily and conveniently and is very suitable for deep processing of waste water.

Description

technical field

[0001] The invention belongs to the field of preparation of bismuth vanadate photocatalysts, in particular to a preparation method of expanded graphite supported nano bismuth vanadate photocatalysts. Background technique

[0002] In recent years, titanium dioxide (TiO 2 ) as the core representative of photocatalytic technology in the field of environmental pollution control, especially in the treatment of refractory biodegradable wastewater and air purification is more and more widely used, but because of its wide band gap, it can only be effective under the irradiation of ultraviolet light Photocatalysis, thus limiting the further expansion of its application field. In order to be able to increase the TiO 2 For the utilization efficiency of sunlight, many experts and scholars at home and abroad focus on TiO2 which responds to visible light. 2 A lot of research work has been carried out on photocatalysts, mainly for TiO 2 Photocatalyst surface structure m...

Examples

Embodiment 1

[0023] (1) Add bismuth nitrate and disodium edetate into the phosphate buffer, and stir magnetically for 15 minutes to form a suspension; dissolve sodium metavanadate evenly in the phosphate buffer, and then add it dropwise to the In the above-mentioned suspension, the magnetic stirring is uniform to form a transparent solution; wherein the amount concentration of bismuth nitrate, sodium metavanate and disodium edetate is 0.01mol / L, and the phosphate buffer is composed of 0.025mol / L sodium dihydrogen phosphate and 0.05mol / L sodium hydrogen phosphate;

[0024] (2) Adjust the pH value of the above-mentioned transparent solution to 4.5 by using an aqueous sodium hydroxide solution with a concentration of 0.5mol / L, and then add expanded graphite at 60°C, wherein the mass ratio of bismuth salt to expanded graphite is 1:5, continuous magnetic force Stir and mix, reflux for 6 hours, centrifuge, filter, and wash to obtain a yellow product. Finally, the obtained product is roasted at ...

Embodiment 2

[0026] (1) Add bismuth chloride and sodium gluconate to the phosphate buffer, stir magnetically for 35 minutes to form a suspension; dissolve ammonium metavanadate evenly in the phosphate buffer, and then add it dropwise to the above suspension In the liquid, the magnetic stirring is uniform to form a transparent solution; wherein the molar concentration of bismuth chloride substance is 0.06mol / L, the molar concentration of sodium gluconate substance is 0.03mol / L, and the molar concentration of ammonium metavanitate substance is 0.06mol / L L, phosphate buffer is composed of 0.03mol / L sodium dihydrogen phosphate and 0.08mol / L sodium hydrogen phosphate;

[0027] (2) The pH value of the above-mentioned transparent solution is adjusted to 7 by an aqueous potassium hydroxide solution with a concentration of 1mol / L, and then expanded graphite is added at 80° C., wherein the mass ratio of bismuth salt to expanded graphite is 1: 12, and continuous magnetic stirring Mix, reflux for 15 h...

Embodiment 3

[0029] (1) Add bismuth acetate and butane tetracarboxylic acid into the phosphate buffer, stir magnetically for 60 minutes to form a suspension; dissolve potassium metavanadate evenly in the phosphate buffer, and then add it dropwise to the above suspension In the turbid liquid, the magnetic stirring is uniform to form a transparent solution; wherein the molar concentration of bismuth acetate is 0.15mol / L, butane tetracarboxylic acid is 0.05mol / L, and potassium metavanate is 0.05mol / L. 0.15mol / L, the phosphate buffer is composed of 0.05mol / L sodium dihydrogen phosphate and 0.1mol / L sodium hydrogen phosphate;

[0030] (2) The pH value of the above-mentioned transparent solution is adjusted to 9 by using an aqueous sodium hydroxide solution with a concentration of 1.5mol / L, and then expanded graphite is added at 100°C, wherein the mass ratio of bismuth salt to expanded graphite is 1:20, continuous magnetic force Stir and mix, reflux for 24 hours, centrifuge, filter, and wash to ...

technical field

[0001] The invention belongs to the field of preparation of bismuth vanadate photocatalysts, in particular to a preparation method of expanded graphite supported nano bismuth vanadate photocatalysts. Background technique

[0002] In recent years, titanium dioxide (TiO 2 ) as the core representative of photocatalytic technology in the field of environmental pollution control, especially in the treatment of refractory biodegradable wastewater and air purification is more and more widely used, but because of its wide band gap, it can only be effective under the irradiation of ultraviolet light Photocatalysis, thus limiting the further expansion of its application field. In order to be able to increase the TiO 2 For the utilization efficiency of sunlight, many experts and scholars at home and abroad focus on TiO2 which responds to visible light. 2 A lot of research work has been carried out on photocatalysts, mainly for TiO 2 Photocatalyst surface structure m...

Examples

Embodiment 1

[0023] (1) Add bismuth nitrate and disodium edetate into the phosphate buffer, and stir magnetically for 15 minutes to form a suspension; dissolve sodium metavanadate evenly in the phosphate buffer, and then add it dropwise to the In the above-mentioned suspension, the magnetic stirring is uniform to form a transparent solution; wherein the amount concentration of bismuth nitrate, sodium metavanate and disodium edetate is 0.01mol / L, and the phosphate buffer is composed of 0.025mol / L sodium dihydrogen phosphate and 0.05mol / L sodium hydrogen phosphate;

[0024] (2) Adjust the pH value of the above-mentioned transparent solution to 4.5 by using an aqueous sodium hydroxide solution with a concentration of 0.5mol / L, and then add expanded graphite at 60°C, wherein the mass ratio of bismuth salt to expanded graphite is 1:5, continuous magnetic force Stir and mix, reflux for 6 hours, centrifuge, filter, and wash to obtain a yellow product. Finally, the obtained product is roasted at ...

Embodiment 2

[0026] (1) Add bismuth chloride and sodium gluconate to the phosphate buffer, stir magnetically for 35 minutes to form a suspension; dissolve ammonium metavanadate evenly in the phosphate buffer, and then add it dropwise to the above suspension In the liquid, the magnetic stirring is uniform to form a transparent solution; wherein the molar concentration of bismuth chloride substance is 0.06mol / L, the molar concentration of sodium gluconate substance is 0.03mol / L, and the molar concentration of ammonium metavanitate substance is 0.06mol / L L, phosphate buffer is composed of 0.03mol / L sodium dihydrogen phosphate and 0.08mol / L sodium hydrogen phosphate;

[0027] (2) The pH value of the above-mentioned transparent solution is adjusted to 7 by an aqueous potassium hydroxide solution with a concentration of 1mol / L, and then expanded graphite is added at 80° C., wherein the mass ratio of bismuth salt to expanded graphite is 1: 12, and continuous magnetic stirring Mix, reflux for 15 h...

Embodiment 3

[0029] (1) Add bismuth acetate and butane tetracarboxylic acid into the phosphate buffer, stir magnetically for 60 minutes to form a suspension; dissolve potassium metavanadate evenly in the phosphate buffer, and then add it dropwise to the above suspension In the turbid liquid, the magnetic stirring is uniform to form a transparent solution; wherein the molar concentration of bismuth acetate is 0.15mol / L, butane tetracarboxylic acid is 0.05mol / L, and potassium metavanate is 0.05mol / L. 0.15mol / L, the phosphate buffer is composed of 0.05mol / L sodium dihydrogen phosphate and 0.1mol / L sodium hydrogen phosphate;

[0030] (2) The pH value of the above-mentioned transparent solution is adjusted to 9 by using an aqueous sodium hydroxide solution with a concentration of 1.5mol / L, and then expanded graphite is added at 100°C, wherein the mass ratio of bismuth salt to expanded graphite is 1:20, continuous magnetic force Stir and mix, reflux for 24 hours, centrifuge, filter, and wash to ...