2, 4-diaminobenzenesulfonate polymerization modification polymer materials -pan hg ion sorbent and the preparing method

Abstract

The invention discloses a new mercury ion adsorbent. The diaminobenzenesulfonic acid copolymerized modified polyaniline mercury ion adsorbent of the present invention is obtained through chemical oxidation copolymerization of aniline and 2,4-diaminobenzenesulfonate sodium. The present invention uses diaminobenzenesulfonic acid to copolymerize and modify polyaniline through chemical oxidation to obtain copolyaniline particles, so that sulfonic acid groups with chelating and ion exchange functions are introduced into the main chain of polyaniline, and polyaniline The content of amino functional groups in the medium makes this adsorbent have excellent adsorption performance for mercury ions, greatly improving the adsorption capacity of polyaniline for mercury-containing waste liquid, which is more than ten times the saturated adsorption capacity of activated carbon. In addition, the preparation of the adsorbent has the characteristics of high synthesis yield, simple and easy process, low requirements on production equipment, and rapid promotion.

Description

technical field

[0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to the use of diaminobenzenesulfonic acid copolymerized modified polyaniline as a mercury ion adsorbent. Background technique

[0002] Mercury is widely distributed in nature. Almost all minerals contain mercury. Mercury is one of the indispensable substances for industrial production and scientific research. However, mercury is one of the most harmful elements to humans and higher organisms. Water-soluble inorganic mercury compounds are easily absorbed by the intestinal tract, such as mercuric chloride (mercuric dichloride), which is very toxic, and inorganic mercury passes through Biomethylation produces more toxic methylmercury, which is absorbed by plants and enters the human body through the enrichment of the food chain, and its enrichment factor can be as high as 10 6 ~10 7 . Mercury pollution emitted by human factors is the main cause of global me...

Examples

Embodiment 1～3

[0033] Embodiment 1~3: prepare AN / SDB copolyaniline

[0034] Accurately take AN monomer 0.054mol (4.92mL, namely 5.022g) and SDB monomer 0.006 mol (1.26g) was placed in a 250mL dry and clean beaker, added 150mL 1.0mol / L hydrochloric acid, stirred at 25°C for 0.5h until completely dissolved, and a colorless solution was obtained; the molar ratio of ammonium persulfate / monomer was 1 / 1 , weighed 0.06mol (13.68g) (NH 4 ) 2 S 2 o 8 Dissolve in 50mL of 1.0mol / L hydrochloric acid, stir in a water bath for 0.5h until completely dissolved. Add dropwise (NH 4 ) 2 S 2 o 8 solution into the above monomer mixture. After the dropwise addition, the reaction was continued for 24h. After the reaction was completed, filter and wash several times with distilled water until the 2 Solution test clear solution without SO 4 2- ion until (generally 1000mL of water is used). The product was transferred to a Petri dish and dried at 40° C. for one week to obtain dark green doped PANSDB cop...

Embodiment 4

[0037] Take 50 mg of AN / SDB copolymer with a molar ratio of 8:2, put it into 25 mL of mercuric nitrate solution with an initial concentration of 5.00 mmol / L at 30°C and stir for 24 hours. After filtering with filter paper, titrate the mercury in the filtrate by volumetric analysis Ion content, the results show that under this condition, the adsorption rate is about 97.4%, and the adsorption capacity is 495.7mg / g.

[0038] Under the same adsorption conditions, the adsorption rate of AN / SDB copolymer with a molar ratio of 7:3 is about 98.3%, and the adsorption capacity is 497.7mg / g.

Embodiment 5

[0040] Take 50 mg of AN / SDB copolymer with a molar ratio of 9:1 and put it into 25 mL of mercuric nitrate solution with an initial concentration of 0.10 mmol / / L at 30°C and stir for 24 hours. After filtering with filter paper, use a mercury detector to analyze the mercury ions in the filtrate The results show that the residual mercury ion concentration after adsorption under this condition is 1.75ppb. The adsorption rate is 99.99%, and the adsorption capacity is 9.99mg / g.

technical field

[0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to the use of diaminobenzenesulfonic acid copolymerized modified polyaniline as a mercury ion adsorbent. Background technique

[0002] Mercury is widely distributed in nature. Almost all minerals contain mercury. Mercury is one of the indispensable substances for industrial production and scientific research. However, mercury is one of the most harmful elements to humans and higher organisms. Water-soluble inorganic mercury compounds are easily absorbed by the intestinal tract, such as mercuric chloride (mercuric dichloride), which is very toxic, and inorganic mercury passes through Biomethylation produces more toxic methylmercury, which is absorbed by plants and enters the human body through the enrichment of the food chain, and its enrichment factor can be as high as 10 6 ~10 7 . Mercury pollution emitted by human factors is the main cause of global me...

Examples

Embodiment 1～3

[0033] Embodiment 1~3: prepare AN / SDB copolyaniline

[0034] Accurately take AN monomer 0.054mol (4.92mL, namely 5.022g) and SDB monomer 0.006 mol (1.26g) was placed in a 250mL dry and clean beaker, added 150mL 1.0mol / L hydrochloric acid, stirred at 25°C for 0.5h until completely dissolved, and a colorless solution was obtained; the molar ratio of ammonium persulfate / monomer was 1 / 1 , weighed 0.06mol (13.68g) (NH 4 ) 2 S 2 o 8 Dissolve in 50mL of 1.0mol / L hydrochloric acid, stir in a water bath for 0.5h until completely dissolved. Add dropwise (NH 4 ) 2 S 2 o 8 solution into the above monomer mixture. After the dropwise addition, the reaction was continued for 24h. After the reaction was completed, filter and wash several times with distilled water until the 2 Solution test clear solution without SO 4 2- ion until (generally 1000mL of water is used). The product was transferred to a Petri dish and dried at 40° C. for one week to obtain dark green doped PANSDB cop...

Embodiment 4

[0037] Take 50 mg of AN / SDB copolymer with a molar ratio of 8:2, put it into 25 mL of mercuric nitrate solution with an initial concentration of 5.00 mmol / L at 30°C and stir for 24 hours. After filtering with filter paper, titrate the mercury in the filtrate by volumetric analysis Ion content, the results show that under this condition, the adsorption rate is about 97.4%, and the adsorption capacity is 495.7mg / g.

[0038] Under the same adsorption conditions, the adsorption rate of AN / SDB copolymer with a molar ratio of 7:3 is about 98.3%, and the adsorption capacity is 497.7mg / g.

Embodiment 5

[0040] Take 50 mg of AN / SDB copolymer with a molar ratio of 9:1 and put it into 25 mL of mercuric nitrate solution with an initial concentration of 0.10 mmol / / L at 30°C and stir for 24 hours. After filtering with filter paper, use a mercury detector to analyze the mercury ions in the filtrate The results show that the residual mercury ion concentration after adsorption under this condition is 1.75ppb. The adsorption rate is 99.99%, and the adsorption capacity is 9.99mg / g.

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