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Photoelectrocatalytic system and method for directionally converting degraded organic pollutants into synthesis gas

A technology of organic pollutants and photoelectric catalysis, applied in water pollutants, chemical instruments and methods, electrolysis process, etc. The effect of photocorrosion

Inactive Publication Date: 2019-09-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Photoelectrocatalytic system and method for directionally converting degraded organic pollutants into synthesis gas

Examples

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Effect test

Embodiment 1

[0023] An electrode material and preparation method for photoelectrocatalytically degrading pollutant phenol while converting degradation products into synthesis gas. The specific preparation process includes the following steps:

[0024] (1) The surface of the pure Ti plate (1.5cm×5cm) was polished with 180#, 320# and 600# sandpaper in sequence, and then the surface of the electrode was polished with metallographic sandpaper until the surface was smooth and flat. After ultrasonic cleaning in acetone, ethanol and distilled water for 15 min, the 2 The atmosphere is dry.

[0025] (2) A two-electrode system is adopted, the Pt sheet is used as the cathode, and the Ti sheet is used as the anode. 4 F and 2.0vol%H 2 In the ethylene glycol solution of O, the pure Ti plate was anodized in the first step (60V, 4h) at a constant temperature of 25°C, washed with distilled water and dried, and the irregular TiO on the surface was peeled off. 2 NTs, hexagonal pits with an ordered structu...

Embodiment 2

[0030] Using the experimental conditions of Example 1, the cathode materials are Pd-Cu and Cu respectively, and after the cathode is modified with Pd, the gas phase reduction product CO of the cathode is twice that of the pure copper mesh. It further illustrates that the cathode material of the present invention has good reduction performance. It can be seen from the comparison that the Pd-modified copper mesh has a good effect on CO 2 Reduction has relatively excellent performance.

[0031] As can be seen from Examples 1 and 2, the Pd QDs-TiO prepared by the present invention 2 NTs, Pd-Cu materials, and the designed system and method can realize the degradation of organic pollutants at the anode while the product CO 2 The purpose of reducing to syngas, and both cathode and anode materials show excellent performance. Through calculation, the carbon conversion rate is 9.52%. If 1t of phenol is degraded, there will be 44kg of carbon that does not need to be emitted and can be...

Embodiment 3

[0033] Pd QDs-TiO prepared by the method of Example 1 2 NTs is the anode material, Pd-Cu is the cathode material, phenol is the target pollutant, its concentration is 100mg / L, a single-chamber two-electrode system, the constant current density is 3mA cm -2 , in the generated syngas, the carbon-to-hydrogen ratio is 0, that is, no hydrogen is produced and only CO is produced; when the current density is 5mA cm -2 , the ratio of carbon to hydrogen in the syngas is 1:3; when the current density is 10mA cm -2 , the ratio of carbon to hydrogen is 1:6; when the current density is 20mA cm -2 When the ratio of carbon to hydrogen is 1:6.6, that is, controlling different current densities can change the ratio of carbon and hydrogen in the synthesis and reduce the cost of further processing to generate downstream products.

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Abstract

The invention relates to a photoelectrocatalytic system and a method for directionally converting organic pollutants, degraded by using the photoelectrocatalytic system, into synthesis gas. The system is a single-chamber and two-pole system, wherein an anode material is Pd quantum dots (QDs)-TiO2 nanotubes (NTs), and a cathode material is Pd-Cu. Pd QDs are evenly deposited on the surface of a TiO2 NT electrode as an anode, and a copper mesh is modified by Pd by using an ion exchange method so as to form a cathode; the method can be used for directionally converting the organic pollutants, degraded by using the single-chamber and two-pole system in a way of high efficiency photoelectrocatalysis, into the synthesis gas. Compared with the prior art, the simple and convenient method realizes the directional conversion of the degraded organic pollutants into the synthesis gas, thus not only effectively degrading the pollutants and protecting the environment, but also converting the degraded products into the synthesis gas by means of a cathodic reaction and further fully utilizing the resources; the two purposes of pollutant degradation and resource recycling are realized by using one system; furthermore, carbon emission is reduced, so that the greenhouse effect is relieved.

Description

technical field [0001] The present invention relates to degradation of environmental pollutants, energy utilization, CO 2 The technical field of reduction, especially the method, system design and material preparation method for the directional conversion of pollutants to syngas, has constructed a system for the efficient oxidation of pollutants to directional conversion to syngas, so as to realize the "pollutant-hydrocarbon fuel "Directed recycling. Background technique [0002] Water contains a large number of organic pollutants, which are difficult to degrade, highly toxic, and easy to accumulate in water, such as phenol and catechol, which are highly toxic substances that can be absorbed through the skin, digestive tract, and respiratory tract to cause symptoms of systemic poisoning Short-term heavy exposure can cause acute damage to multiple organ systems such as the central nervous system, liver and kidney, myocardium, and blood. The commonly used treatment methods f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30C02F1/461C02F1/72C25B1/00C25B1/02C25B11/06C02F101/34
CPCC02F1/30C02F1/46109C02F1/4672C02F2001/46133C02F2101/345C02F2305/10C25B1/00C25B1/02C25B1/55C25B11/091C25B11/093Y02E60/36
Inventor 赵国华崔蓉蓉
Owner TONGJI UNIV
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