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

Abstract

The invention discloses a method for treating nitroaromatic hydrocarbons using a polydopamine-reduced carbon nitride-loaded nano-gold catalyst. The nano-gold catalyst is added to nitroaromatic hydrocarbons and BH-containing substances. 4 － In a mixed solution of salts, degradation treatment is performed; the nano-gold catalyst includes a polydopamine-carbon nitride carrier formed by the self-polymerization of dopamine on the carbon nitride surface, and nano-gold particles reduced by polydopamine on the carrier, The polydopamine is in an amorphous state coating sheet-like carbon nitride, the gold nanoparticles are loaded on the surface of the polydopamine-carbon nitride carrier, and the mass ratio of the gold nanoparticles to the polydopamine-carbon nitride carrier is 1~ 4:30, the mass ratio of polydopamine to carbon nitride is 0.8~1.2:1. The method of the present invention has the advantages of simple operation, rapid reaction, easy recovery and reuse of the catalyst, and high degradation efficiency. It is a method that can be widely used for treating nitroaromatic 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...

Examples

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...

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...

Examples

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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