A method for treating nitroaromatic hydrocarbons with a carbon nitride-supported nano-gold catalyst reduced by polydopamine

A technology of nitroaromatic hydrocarbons and polydopamine, which is applied in the direction of reducing water/sewage treatment, physical/chemical process catalyst, organic compound/hydride/coordination complex catalyst, etc. Ideal and other problems, to achieve the effect of short active hydrogen transfer distance, good electron transfer ability and high catalytic efficiency

Active Publication Date: 2019-10-15
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using traditional methods to load nano-gold on carbon nitride also requires the addition of chemical reagents such as sodium borohydride, which does not meet the theme of green chemistry.
[0006] In addition, the catalytic efficiency of the reduction treatment of nitroaromatic hydrocarbons with the existing nano-gold catalyst is not ideal, and some reactions cannot be completed after more than 20 minutes.

Method used

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  • A method for treating nitroaromatic hydrocarbons with a carbon nitride-supported nano-gold catalyst reduced by polydopamine
  • A method for treating nitroaromatic hydrocarbons with a carbon nitride-supported nano-gold catalyst reduced by polydopamine
  • A method for treating nitroaromatic hydrocarbons with a carbon nitride-supported nano-gold catalyst reduced by polydopamine

Examples

Experimental program
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Effect test

Embodiment 1

[0057] A method utilizing polydopamine-reduced carbon nitride-loaded nano-gold catalysts to process nitroaromatic substances, comprising the following steps:

[0058] Use deionized water to prepare p-nitrophenol solution A with a concentration of 0.02mM. The solution A is light yellow, and its ultraviolet spectrum is measured. Take 1.5mL of the prepared A solution and add freshly prepared NaBH with a concentration of 8mM 4 Solution B 1.5mL, the solution was light yellow-green after being fully mixed, and its ultraviolet spectrum was measured. 10 mg of the prepared polydopamine-reduced carbon nitride supported nano-gold catalyst was added to the mixed solution of A and B prepared above, and its ultraviolet spectrum was measured with an ultraviolet spectrophotometer at different reaction times.

[0059] The above-mentioned polydopamine-reduced carbon nitride-supported nano-gold catalyst, nano-gold and PDA-g-C 3 N 4 The mass ratio of the carrier is 3:30, the mass ratio of poly...

Embodiment 2

[0070] A method utilizing polydopamine-reduced carbon nitride-loaded nano-gold catalysts to process nitroaromatic substances, comprising the following steps:

[0071] Use deionized water to prepare p-nitrophenol solution A with a concentration of 0.02mM. The solution A is light yellow, and its ultraviolet spectrum is measured. Take 1.5mL of the prepared A solution and add freshly prepared NaBH with a concentration of 8mM 4 Solution B 1.5mL, the solution was light yellow-green after being fully mixed, and its ultraviolet spectrum was measured. Take the prepared carbon nitride-loaded nano-gold catalyst 10 mg of polydopamine reduction of different nano-gold loads, add it to the mixed solution of A and B prepared above, and measure its ultraviolet ray with a UV spectrophotometer at different reaction times. spectroscopic spectrum.

[0072] The above-mentioned polydopamine-reduced carbon nitride-supported nano-gold catalyst, nano-gold and PDA-g-C 3 N 4 The mass ratio of the car...

Embodiment 3

[0079] A method utilizing polydopamine-reduced carbon nitride-loaded nano-gold catalysts to process nitroaromatic substances, comprising the following steps:

[0080] Use deionized water to prepare 0.02mM p-nitrophenol, 0.02mM 2,4-nitrophenol and 0.02mM methyl orange solutions, respectively take 1.5mL of the prepared solutions, and add freshly prepared concentrations 8mM NaBH 4 Solution 1.5mL, after mixing thoroughly, measure its ultraviolet spectrum. Take 10 mg of the polydopamine-reduced carbon nitride-loaded nano-gold catalyst prepared in Example 1, add it to the mixed solution prepared above, and measure its ultraviolet spectrum with an ultraviolet spectrophotometer at different reaction times.

[0081] Figure 5 For PDA-g-C in Example 3 of the present invention 3 N 4 / Au (9) Degradation effects of catalysts on p-nitrophenol, 2,4-nitrophenol and methyl orange (Ln(C t / C 0 )~t curve). Depend on Figure 5 It can be seen that the supported nano-gold catalyst prepared...

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Abstract

The invention discloses a method for treating nitro aromatic hydrocarbon substances by polydopamine reduced carbon nitride supported nano-gold catalysts. The nano-gold catalysts are added into the nitro aromatic hydrocarbon substances and mixed solution containing BH4- salt, and degradation is performed. The nano-gold catalysts include polydopamine-carbon nitride supporters and nano-gold particles, the polydopamine-carbon nitride supporters are formed by automatically polymerizing dopamine on the surface of carbon nitride, the nano-gold particles are reduced by polydopamine on the supporters,the polydopamine coats the flaky carbon nitride in an amorphous form, the nano-gold particles are supported on the surfaces of the polydopamine-carbon nitride supporters, the mass ratio of the nano-gold particles to the polydopamine-carbon nitride supporters is (1-4):30, and the mass ratio of the polydopamine to the carbon nitride is (0.8-1.2):1. The method has the advantages of simplicity in operation, rapidness in reaction, easiness in recycling of the catalysts, high degradation efficiency and the like, and can be widely applied to treatment of nitro aromatic hydrocarbons.

Description

technical field [0001] The invention belongs to the field of reduction treatment of nitroaromatic substances, and relates to a method for treating nitroaromatic substances with a carbon-loaded nano-gold catalyst, in particular to a carbon nitride-loaded nano-gold reduced by polydopamine A method for catalyst reduction treatment of nitro aromatic hydrocarbons. Background technique [0002] Nitroaromatic hydrocarbons (such as p-nitrophenol, 2-nitrophenol, 2,4-nitrophenol, azo dyes, etc.) are important chemical raw materials, widely used in pesticides, dyes, explosives, pharmaceuticals and other chemical industries Production of products. About 10,000 tons and 30,000 tons of aniline and nitrobenzene compounds are discharged into the environment every year in the world. With the development of the chemical industry, the demand for such chemicals is increasing, and the amount discharged into the environment is also increasing. Such substances are highly toxic and can cause poi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/26B01J37/16C02F1/70C02F101/34C02F101/38
CPCC02F1/705B01J31/26B01J37/16C02F2101/345C02F2101/308C02F2101/38B01J35/393B01J35/23
Inventor 秦蕾曾光明赖萃黄丹莲符玉葵张辰许飘程敏周响响熊炜平文晓凤周成赟
Owner HUNAN UNIV
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