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Application of transition metal carbonate nanomaterial in electrocatalytic reduction reaction of nitrate

A nanomaterial and transition metal technology, applied in electrodes, electrolysis components, electrolysis processes, etc., can solve problems such as unsuitable large-scale industrial applications, catalytic activity and stability effects, toxic by-products, etc. The effect of low production cost and low reaction by-products

Active Publication Date: 2021-12-14
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although noble metal catalysts have good stability, their high cost is not suitable for large-scale industrial applications
Other low-cost transition metal-based catalysts have certain advantages and disadvantages. For example, copper-based catalysts often produce a large amount of toxic by-products (nitrite); iron-based catalysts are ideal catalysts, but their catalytic activity and stability will be affected. affected by the environment

Method used

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  • Application of transition metal carbonate nanomaterial in electrocatalytic reduction reaction of nitrate
  • Application of transition metal carbonate nanomaterial in electrocatalytic reduction reaction of nitrate
  • Application of transition metal carbonate nanomaterial in electrocatalytic reduction reaction of nitrate

Examples

Experimental program
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Effect test

preparation example Construction

[0031] A transition metal carbonate nanomaterial Co@Cu 2 (OH) 2 CO 3 The preparation method comprises the following steps:

[0032] S1, dissolving copper salt and cobalt salt in water to obtain mixed solution A;

[0033] S2. Dissolving hydroxide and anhydrous carbonate in water to obtain a mixed solution B;

[0034] S3. Slowly add the mixed solution B obtained in step S2 to the mixed solution A obtained in step S1 under continuous stirring, transfer to a high-pressure reaction kettle, seal and place it in a box-type resistance furnace. The reaction was carried out for 10-48 hours, cooled to room temperature, washed and dried by centrifugation to obtain Co@Cu 2 (OH) 2 CO 3 .

[0035] Wherein, the cobalt salt is one or more of cobalt chloride, cobalt hydroxide, cobalt carbonate, cobalt acetate, cobalt sulfate; the copper salt is copper chloride, tungsten hydroxide, copper carbonate, copper acetate, One or more of copper sulfate and copper nitrate.

[0036] The consumption...

Embodiment 1～4

[0041] Embodiment 1~4 used raw material and consumption are as shown in table 1 below:

[0042] Table 1

[0043]

[0044] 1, the preparation method of the transition metal carbonate nanomaterial of embodiment 1~4 is:

[0045] Configure mixed solution A and mixed solution B according to the ratio shown in Table 1, slowly add mixed solution B to mixed solution A under constant stirring until the pH value reaches 8.2±0.2, continuously stir at room temperature for 1 hour, transfer to 50 ml autoclave was sealed and reacted at 80°C for 12 hours. After the reactor was cooled to room temperature, the product was collected by centrifugation, washed with water and ethanol at least three times, and dried overnight in an oven at 60°C to obtain the transition metal carbonate nanomaterials of Examples 1-4.

[0046] In order to facilitate the distinction, according to the ratio of the amount of copper to cobalt in Examples 1 to 4 of the present invention, the transition metal carbonate ...

Embodiment 5

[0054] Transition metal carbonate nanomaterial 3Co@Cu prepared with embodiment 1 2 (OH) 2 CO 3 As an example, for the preparation of an electrocatalytic reduction nitrate electrode, the specific steps are as follows:

[0055] Weigh 1mg 3Co@Cu 2 (OH) 2 CO 3 Mixed with acetylene black and polyvinylidene fluoride in N-methylpyrrolidone solution, where, 3Co@Cu 2 (OH) 2 CO 3 , acetylene black, and polyvinylidene fluoride in a mass ratio of 8:1:1 to obtain a catalyst slurry. After ultrasonication for one hour, absorb the catalyst slurry and apply it evenly on the pretreated hydrophilic carbon cloth. The effective area of ​​the catalyst is controlled at 1cm 2 , arrange the catalyst-loaded carbon in a vacuum drying oven, and dry at 80° C. overnight.

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Abstract

The invention relates to application of a transition metal carbonate nanomaterial in electrocatalytic reduction of nitrate, belonging to the technical field of electrocatalytic reduction of nitrate. The preparation method comprises the following steps: preparing the transition metal carbonate nanomaterial Co@Cu2(OH)2CO3 by a simple one-step hydrothermal method, preparing catalyst slurry from the transition metal carbonate nanomaterial Co@Cu2(OH)2CO3, acetylene black and an N-methyl pyrrolidone solution of polyvinylidene fluoride, loading the catalyst slurry on hydrophilic carbon cloth to obtain an electrocatalytic reduction nitrate electrode, and with the electrocatalytic reduction nitrate electrode as a working electrode, forming a three-electrode system, which is used for electrocatalytic reduction of nitrate in sewage, from the working electrode, a platinum electrode and a saturated calomel electrode. The transition metal carbonate nanomaterial disclosed by the invention is simple in preparation method, high in yield, friendly to environment, low in production cost and high in thermal stability and chemical stability, shows high catalytic activity and selectivity and high cycling stability in electrocatalytic reduction of nitrate, and is suitable for large-scale industrial application.

Description

technical field [0001] The invention relates to the application of a transition metal carbonate nanometer material in electrocatalytic reduction of nitrate, and belongs to the technical field of electrocatalytic reduction of nitrate. Background technique [0002] The nitrogen cycle is one of the most important cycles on the earth, and it maintains a dynamic equilibrium state until it is disturbed by human activities. Due to the excessive use of nitrogen fertilizers in agriculture and the large amount of industrial sewage discharge, excessive nitrate concentrations have been detected in many water bodies (including surface water and groundwater), resulting in eutrophication of water bodies, reducing the available oxygen content of aquatic organisms, and destroying aquatic ecosystems. In addition, nitrate in the human body can be reduced to nitrite by gastrointestinal microorganisms, causing liver damage, hyperhemoglobinemia (also known as "blue baby syndrome"), and even the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C25B11/052C25B11/095C02F101/16
CPCC02F1/4676C25B11/052C25B11/095C02F2001/46142C02F2101/163Y02W10/37
Inventor 宋俊玲屈爽郁红艳郭正瀚滕跃桑欣欣刘敬成邹路易
Owner JIANGNAN UNIV
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