Carbon-coated synergistic carbon-sulfur-codoped SnO2 photocatalyst and preparation method thereof

Abstract

The invention discloses a preparation method of a carbon-coated synergistic carbon-sulfur codoped SnO2 photocatalyst. The preparation method comprises the following steps: (1) adding a tin source anda sulfur source to deionized water, performing ultrasonic dispersion for achieving uniformity, adding an organic solvent while stirring, transferring the obtained mixed solution into a reaction kettle, carrying out a solvothermal reaction, and washing, drying and grinding the obtained precipitate after the reaction is completed to form a uniform powder that is an MOF precursor; and (2) placing andcalcining the prepared MOF precursor powder prepard in step (1) in a muffle furnace, cooling the obtained sample to room temperature, and taking out and uniformly grinding the sample to obtain the carbon-coated synergistic carbon-sulfur codoped SnO2 photocatalyst. The photocatalyst of the invention has the advantages of simple preparation method, easy availability and low cost of raw materials, high yield, high photocatalytic carbon dioxide reduction performance and strong light corrosion resistance, and has a broad application prospect in the photocatalysis field.

Description

technical field

[0001] The invention belongs to the field of environmental protection and energy materials, in particular, it relates to a carbon-coated SnO with synergistic carbon-sulfur co-doping 2 Photocatalyst and its preparation method. Background technique

[0002] Since the massive combustion of fossil fuels such as coal, oil and natural gas results in a large amount of greenhouse gas emissions mainly carbon dioxide, the burning of such fossil fuels is unsustainable. Issues such as global warming and sea level rise brought about by greenhouse gases are becoming more and more serious. Therefore, here we use artificial photosynthesis to reduce a large amount of greenhouse gases mainly carbon dioxide into organic substances such as methane, formaldehyde, methanol and ethanol that we need in our daily life, which can greatly reduce the harmful effects of greenhouse gas emissions. It is in line with the concept of sustainable development currently advocated. Here, using...

Examples

Embodiment 1

[0029] A carbon-coated synergistic carbon-sulfur co-doped SnO 2 The preparation method of photocatalyst comprises the following steps:

[0030](1) Preparation of MOF material precursor: Add 1mmol tin tetrachloride and 2mmol sulfur powder into deionized water, disperse evenly with an ultrasonic machine, then place the solution on a stirrer and stir, and slowly add 5mL Diethylenetriamine, and then stir the mixed solution for 30min, and finally transfer it to a reaction kettle lined with polytetrafluoroethylene, keep it at 80°C for 4h by solvothermal method, and centrifugally wash the obtained precipitate with deionized water after the reaction Several times, drying, and grinding into a uniform powder to obtain the MOF precursor;

[0031] (2) Carbon-coated synergistic carbon-sulfur co-doped SnO 2 Preparation of photocatalyst: first: put the MOF precursor powder prepared in step (1) into the furnace and raise the temperature to 300°C at a heating rate of 5°C / min and keep it for ...

Embodiment 2

[0033] A carbon-coated synergistic carbon-sulfur co-doped SnO 2 The preparation method of photocatalyst comprises the following steps:

[0034] (1) Preparation of MOF material precursor: Add 1.2mmol tin tetrachloride and 2.3mmol thioacetamide into deionized water, disperse evenly with an ultrasonic machine, then place the solution on a stirrer and stir, during the stirring process , slowly added 8 mL of ethylenediamine, then stirred the mixed solution for 30 min, and finally transferred it to a reaction kettle with a polytetrafluoroethylene liner, and kept it at 140 ° C for 8 h by solvothermal method. After the reaction, the obtained precipitate was deionized The MOF precursor was obtained by centrifugal washing with water and absolute ethanol for several times, drying, and grinding into a uniform powder;

[0035] (2) Carbon-coated synergistic carbon-sulfur co-doped SnO 2 Preparation of photocatalyst: first: put the MOF precursor powder prepared in step (1) into the furnace ...

Embodiment 3

[0037] A carbon-coated synergistic carbon-sulfur co-doped SnO 2 The preparation method of photocatalyst comprises the following steps:

[0038] (1) Preparation of MOF material precursor: Add 1.5mmol tin dichloride and 2mmol thiourea into deionized water, disperse evenly with an ultrasonic machine, then place the solution on a stirrer and stir, and slowly add 10mL of triethylenetetramine, then stirred the mixed solution for 30min, and finally transferred to a reaction kettle lined with polytetrafluoroethylene, kept at 180°C for 8h by solvothermal method, and filtered the obtained precipitate with deionized water after the reaction Wash several times, dry, and grind into a uniform powder to obtain the MOF precursor;

[0039] (2) Carbon-coated synergistic carbon-sulfur co-doped SnO 2 Preparation of photocatalyst: first: put the MOF precursor powder prepared in step (1) into the furnace and raise the temperature to 500°C at a heating rate of 8°C / min and keep it for 30min, then w...

technical field

[0001] The invention belongs to the field of environmental protection and energy materials, in particular, it relates to a carbon-coated SnO with synergistic carbon-sulfur co-doping 2 Photocatalyst and its preparation method. Background technique

[0002] Since the massive combustion of fossil fuels such as coal, oil and natural gas results in a large amount of greenhouse gas emissions mainly carbon dioxide, the burning of such fossil fuels is unsustainable. Issues such as global warming and sea level rise brought about by greenhouse gases are becoming more and more serious. Therefore, here we use artificial photosynthesis to reduce a large amount of greenhouse gases mainly carbon dioxide into organic substances such as methane, formaldehyde, methanol and ethanol that we need in our daily life, which can greatly reduce the harmful effects of greenhouse gas emissions. It is in line with the concept of sustainable development currently advocated. Here, using...

Examples

Embodiment 1

[0029] A carbon-coated synergistic carbon-sulfur co-doped SnO 2 The preparation method of photocatalyst comprises the following steps:

[0030](1) Preparation of MOF material precursor: Add 1mmol tin tetrachloride and 2mmol sulfur powder into deionized water, disperse evenly with an ultrasonic machine, then place the solution on a stirrer and stir, and slowly add 5mL Diethylenetriamine, and then stir the mixed solution for 30min, and finally transfer it to a reaction kettle lined with polytetrafluoroethylene, keep it at 80°C for 4h by solvothermal method, and centrifugally wash the obtained precipitate with deionized water after the reaction Several times, drying, and grinding into a uniform powder to obtain the MOF precursor;

[0031] (2) Carbon-coated synergistic carbon-sulfur co-doped SnO 2 Preparation of photocatalyst: first: put the MOF precursor powder prepared in step (1) into the furnace and raise the temperature to 300°C at a heating rate of 5°C / min and keep it for ...

Embodiment 2

[0033] A carbon-coated synergistic carbon-sulfur co-doped SnO 2 The preparation method of photocatalyst comprises the following steps:

[0034] (1) Preparation of MOF material precursor: Add 1.2mmol tin tetrachloride and 2.3mmol thioacetamide into deionized water, disperse evenly with an ultrasonic machine, then place the solution on a stirrer and stir, during the stirring process , slowly added 8 mL of ethylenediamine, then stirred the mixed solution for 30 min, and finally transferred it to a reaction kettle with a polytetrafluoroethylene liner, and kept it at 140 ° C for 8 h by solvothermal method. After the reaction, the obtained precipitate was deionized The MOF precursor was obtained by centrifugal washing with water and absolute ethanol for several times, drying, and grinding into a uniform powder;

[0035] (2) Carbon-coated synergistic carbon-sulfur co-doped SnO 2 Preparation of photocatalyst: first: put the MOF precursor powder prepared in step (1) into the furnace ...

Embodiment 3

[0037] A carbon-coated synergistic carbon-sulfur co-doped SnO 2 The preparation method of photocatalyst comprises the following steps:

[0038] (1) Preparation of MOF material precursor: Add 1.5mmol tin dichloride and 2mmol thiourea into deionized water, disperse evenly with an ultrasonic machine, then place the solution on a stirrer and stir, and slowly add 10mL of triethylenetetramine, then stirred the mixed solution for 30min, and finally transferred to a reaction kettle lined with polytetrafluoroethylene, kept at 180°C for 8h by solvothermal method, and filtered the obtained precipitate with deionized water after the reaction Wash several times, dry, and grind into a uniform powder to obtain the MOF precursor;

[0039] (2) Carbon-coated synergistic carbon-sulfur co-doped SnO 2 Preparation of photocatalyst: first: put the MOF precursor powder prepared in step (1) into the furnace and raise the temperature to 500°C at a heating rate of 8°C / min and keep it for 30min, then w...

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