CN109772275A - Mercury absorbent and preparation method thereof - Google Patents
Mercury absorbent and preparation method thereof Download PDFInfo
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- CN109772275A CN109772275A CN201910077669.3A CN201910077669A CN109772275A CN 109772275 A CN109772275 A CN 109772275A CN 201910077669 A CN201910077669 A CN 201910077669A CN 109772275 A CN109772275 A CN 109772275A
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Abstract
The invention discloses a kind of mercury absorbents and preparation method thereof, by ZIF-67 and polyacrylic acid in N, ultrasound to scattering completely in dinethylformamide, again by molysite, manganese salt, sodium selenate and urea are successively dissolved in above-mentioned solution under ultrasound condition, ultrasound is until system is evenly dispersed, the dispersion liquid is subjected to hydro-thermal reaction at 120 ~ 200 DEG C, filtering, washing, it is dry, obtain product A, product A is dispersed in DMF, by N, N- Dicyclohexylcarbodiimide, polyacrylamide solution is added thereto, after ultrasonic disperse, it is stirred to react at room temperature, obtain the adsorbent material.A kind of selectivity height is prepared in the present invention, and adsorption capacity is big, environmentally friendly magnetic adsorptive material, has dispersibility very well, has preferable adsorption effect to mercury, can be recycled.
Description
Technical field
It is especially a kind of to be inhaled for adsorbing the magnetic of Mercury in Wastewater the present invention relates to a kind of mercury absorbent and preparation method thereof
Attached dose and preparation method thereof, belong to field of material preparation.
Background technique
China's water body mercury pollution faces various problems, the mercury concentration over-standard in many basins.Harmful mercury metallic pollution waste water is
One of the important environmental problem that current China is faced.The processing method of mercury metallic wastewater mainly has chemical precipitation, novel suction
Attached dose of absorption, UF membrane, electrochemical process, photocatalysis, bio-flocculation process etc..Wherein, absorption method is because of easy to operate, treatment effeciency
Height becomes the most-often used method that mercury metal ion removes in actual waste water.
Absorption method is mild with operating condition, has wide range of applications, does not introduce new impurity, can carry out depth to waste water
The advantages that processing and widely studied.Currently, the adsorbent research based on active carbon is more, it may have preferable absorption
Effect, but due in practical water body pollutant kind it is more, and mercury concentration is not high, and active carbon is in adsorptive selectivity and absorption
It is still had several drawbacks in depth.
Absorption property is related with the specific surface area of adsorbent, and active constituent is highly dispersed on the carrier of bigger serface
The dosage for reducing active constituent is not only improved, is also beneficial to improve contact of the active constituent with pollutant, improves adsorption effect.But
It is that there are at high cost, adsorption efficiency is low, is also easy to produce secondary pollution problems for the selection of current active component.
Summary of the invention
The object of the present invention is to provide a kind of mercury absorbents and preparation method thereof.
Realizing the technical solution of the object of the invention is: a kind of mercury absorbent and preparation method thereof, by metal organic framework material
Ultrasound to scattering completely in n,N-Dimethylformamide for material ZIF-67 and polyacrylic acid, then by molysite, manganese salt, sodium selenate and urine
Element is successively dissolved in above-mentioned solution under ultrasound condition, and ultrasound is until system is evenly dispersed, by the dispersion liquid at 120~200 DEG C
Lower carry out hydro-thermal reaction, is filtered, washed, dries, obtain product A, product A is dispersed in DMF, by N, N- dicyclohexyl phosphinylidyne
Imines, polyacrylamide solution are added thereto, and after ultrasonic disperse, are stirred to react at room temperature, and the adsorption material is obtained
Material.
Further, concentration of the ZIF-67 in n,N-Dimethylformamide is 2~5g/L, ZIF-67 and polyacrylic acid with
The mass ratio of molysite is 1:4~6:5~6.
Further, the molar ratio of molysite, manganese salt, sodium selenate and urea is 2:1:0.5~2:8~12.
Further, the time of hydro-thermal reaction is 10~15h.
Further, the mass ratio of N, N- Dicyclohexylcarbodiimide and polyacrylamide is 5~20:1.
Further, the mass ratio of polyacrylamide and ZIF-67 are 0.5~1:1.
Compared with prior art, the invention has the advantages that
(1) present invention is using the metal-organic framework materials ZIF-67 of large specific surface area as carrier, using precipitating-hydro-thermal reaction
In conjunction with method, using on the Manganese Ferrite for the being doped with selenium carrier evenly dispersed as active component, while using polyacrylic acid pair
Active component is modified, then polyacrylamide is grafted, and obtains a kind of selectivity height, adsorption capacity is big, environmentally friendly magnetic
Property adsorbent material, have very well dispersibility, have preferable adsorption effect to mercury, can be recycled.
(2) present invention solves the problem that adsorbent material is easy to reunite in waste water, is not easily recycled, and the adsorbent material energy
It is recycled.
(3) adsorbent material of the present invention has preferable stability, can stablize under the higher state of temperature
In the presence of.
Detailed description of the invention
Fig. 1 is the circulation absorption experimental result picture of adsorbent material of the present invention.
Specific embodiment
The preparation of embodiment 1:ZIF-67
Co(NO3)2·6H2O 291mg and 2-methylimidazole 328mg, which is dissolved separately in 25ml methanol solution, to be mixed, room temperature
Lower stirring for 24 hours, to be centrifuged 5min in 6000rpm after reaction, with ethanol washing 4 times, obtains the drying at 60 DEG C after solid phase
6h forms ZIF-67.
Embodiment 2:MnFe2O4The preparation of/ZIF-67 adsorbent material
It weighs 100mg ZIF-67 and is added to 50mlN, in dinethylformamide, ultrasonic 30min keeps system dispersion equal
It is even；Again by 2mmol FeCl3.6H2O、1mmol MnCl2, 0.48g urea above-mentioned solution is successively dissolved under ultrasound condition, ultrasound
30min is sufficiently mixed system, evenly dispersed；It is high-pressure sealed anti-that this solution is then transferred to 150ml stainless steel polytetrafluoroethylene (PTFE)
It answers in kettle, 200 DEG C of constant temperature 12h in constant temperature oven；Repeatedly washed with deionized water and ethyl alcohol, with vacuum drying oven 323K item
Dry 12h, obtains product 1 under part.
The MnFe of embodiment 3:Se doping2O4The preparation of/ZIF-67 adsorbent material
It weighs 100mg ZIF-67 and is added to 50mlN, in dinethylformamide, ultrasonic 30min keeps system dispersion equal
It is even；Again by 2mmol FeCl3.6H2O、1mmol MnCl2、0.5mmol Na2SeO4, 0.5g urea it is successively molten under ultrasound condition
In above-mentioned solution, ultrasonic 30min is sufficiently mixed system, evenly dispersed；This solution is then transferred to 150ml stainless steel poly- four
In the high-pressure sealed reaction kettle of vinyl fluoride, 200 DEG C of constant temperature 12h in constant temperature oven；It is repeatedly washed with deionized water and ethyl alcohol, with true
Empty baking oven dry 12h under conditions of 323K, obtains product 2.
The MnFe of embodiment 4:Se doping2O4The preparation of/ZIF-67- polyacrylic acid adsorbent material
It weighs 100mg ZIF-67 and 400mg polyacrylic acid and is added to 50mlN, in dinethylformamide, ultrasound
30min makes system be uniformly dispersed；Again by 2mmol FeCl3.6H2O、1mmol MnCl2、0.5mmol Na2SeO4, 0.5g urea
Above-mentioned solution is successively dissolved under ultrasound condition, ultrasonic 30min is sufficiently mixed system, evenly dispersed；Then this solution is turned
Enter in the high-pressure sealed reaction kettle of 150ml stainless steel polytetrafluoroethylene (PTFE), 200 DEG C of constant temperature 12h in constant temperature oven；With deionized water and
Ethyl alcohol repeatedly washs, and dries 12h under conditions of 323K with vacuum drying oven, obtains product 3.
The MnFe of embodiment 5:Se doping2O4The preparation of/ZIF-67- poly acrylic acid-poly acrylamide adsorbent material
It weighs 100mg ZIF-67 and 400mg polyacrylic acid and is added to 50mlN, in dinethylformamide, ultrasound
30min makes system be uniformly dispersed；Again by 2mmol FeCl3.6H2O、1mmol MnCl2、0.5mmol Na2SeO4, 0.5g urea
Above-mentioned solution is successively dissolved under ultrasound condition, ultrasonic 30min is sufficiently mixed system, evenly dispersed；Then this solution is turned
Enter in the high-pressure sealed reaction kettle of 150ml stainless steel polytetrafluoroethylene (PTFE), 200 DEG C of constant temperature 12h in constant temperature oven；With deionized water and
Ethyl alcohol repeatedly washs, and dries 12h under conditions of 323K with vacuum drying oven, dried product exhibited is dispersed in DMF；Then will
(dried product exhibited in above-mentioned mixed solution is added in 500mg N, N- Dicyclohexylcarbodiimide, 30ml 2.5g/L polyacrylamide
The mixed solution of+DMF), after ultrasonic 15min, 12h is stirred at room temperature；After reaction magnet separate, and with ethyl alcohol and go from
The mixed liquor of sub- water repeatedly washs (V:V=1:1)；12h is dried under conditions of 323K with vacuum drying oven, obtains product 4.
The MnFe of embodiment 6:Se doping2O4The preparation of/ZIF-67- poly acrylic acid-poly acrylamide adsorbent material
It weighs 100mg ZIF-67 and 500mg polyacrylic acid to be added in 50ml n,N-Dimethylformamide, ultrasound
30min makes system be uniformly dispersed；Again by 2mmol FeCl3.6H2O、1mmol MnCl2、0.5mmol Na2SeO4, 0.5g urea
Above-mentioned solution is successively dissolved under ultrasound condition, ultrasonic 30min is sufficiently mixed system, evenly dispersed；Then this solution is turned
Enter in the high-pressure sealed reaction kettle of 150ml stainless steel polytetrafluoroethylene (PTFE), 200 DEG C of constant temperature 12h in constant temperature oven；With deionized water and
Ethyl alcohol repeatedly washs, and dries 12h under conditions of 323K with vacuum drying oven, dried product exhibited is dispersed in DMF；Then will
500mg N, N- Dicyclohexylcarbodiimide, 30ml 2.5g/L polyacrylamide are added in above-mentioned mixed solution, ultrasonic 15min
Afterwards, 12h is stirred at room temperature；Magnet separates after reaction, and repeatedly washs (V:V with ethyl alcohol and the mixed liquor of deionized water
=1:1)；12h is dried under conditions of 323K with vacuum drying oven, obtains product 5.
The MnFe of embodiment 7:Se doping2O4The preparation of/ZIF-67- poly acrylic acid-poly acrylamide adsorbent material
It weighs 100mg ZIF-67 and 600mg polyacrylic acid to be added in 50m n,N-Dimethylformamide, ultrasound
30min makes system be uniformly dispersed；Again by 2mmol FeCl3.6H2O、1mmol MnCl2、0.5mmol Na2SeO4, 0.5g urea
Above-mentioned solution is successively dissolved under ultrasound condition, ultrasonic 30min is sufficiently mixed system, evenly dispersed；Then this solution is turned
Enter in the high-pressure sealed reaction kettle of 150ml stainless steel polytetrafluoroethylene (PTFE), 200 DEG C of constant temperature 12h in constant temperature oven；With deionized water and
Ethyl alcohol repeatedly washs, and dries 12h under conditions of 323K with vacuum drying oven, dried product exhibited is dispersed in DMF；Then will
500mg N, N- Dicyclohexylcarbodiimide, 30ml 2.5g/L polyacrylamide are added in above-mentioned mixed solution, ultrasonic 15min
Afterwards, 12h is stirred at room temperature；Magnet separates after reaction, and repeatedly washs (V:V with ethyl alcohol and the mixed liquor of deionized water
=1:1)；12h is dried under conditions of 323K with vacuum drying oven, obtains product 6.
The MnFe of embodiment 8:Se doping2O4The preparation of/ZIF-67- poly acrylic acid-poly acrylamide adsorbent material
It weighs 100mg ZIF-67 and 500mg polyacrylic acid to be added in 50m n,N-Dimethylformamide, ultrasound
30min makes system be uniformly dispersed；Again by 2mmol FeCl3.6H2O、1mmol MnCl2、1mmol Na2SeO4, 0.5g urea exists
Above-mentioned solution is successively dissolved under ultrasound condition, ultrasonic 30min is sufficiently mixed system, evenly dispersed；Then this solution is transferred to
In the high-pressure sealed reaction kettle of 150ml stainless steel polytetrafluoroethylene (PTFE), 200 DEG C of constant temperature 12h in constant temperature oven；With deionized water and second
Alcohol repeatedly washs, and dries 12h under conditions of 323K with vacuum drying oven, dried product exhibited is dispersed in DMF；Then will
500mg N, N- Dicyclohexylcarbodiimide, 30ml 2.5g/L polyacrylamide are added in above-mentioned mixed solution, ultrasonic 15min
Afterwards, 12h is stirred at room temperature；Magnet separates after reaction, and repeatedly washs (V:V with ethyl alcohol and the mixed liquor of deionized water
=1:1)；12h is dried under conditions of 323K with vacuum drying oven, obtains product 7.
The MnFe of embodiment 9:Se doping2O4The preparation of/ZIF-67- poly acrylic acid-poly acrylamide adsorbent material
It weighs 100mg ZIF-67 and 500mg polyacrylic acid to be added in 50m n,N-Dimethylformamide, ultrasound
30min makes system be uniformly dispersed；Again by 2mmol FeCl3.6H2O、1mmol MnCl2、2mmol Na2SeO4, 0.5g urea exists
Above-mentioned solution is successively dissolved under ultrasound condition, ultrasonic 30min is sufficiently mixed system, evenly dispersed；Then this solution is transferred to
In the high-pressure sealed reaction kettle of 150ml stainless steel polytetrafluoroethylene (PTFE), 200 DEG C of constant temperature 12h in constant temperature oven；With deionized water and second
Alcohol repeatedly washs, and dries 12h under conditions of 323K with vacuum drying oven, dried product exhibited is dispersed in DMF；Then will
500mg N, N- Dicyclohexylcarbodiimide, 30ml 2.5g/L polyacrylamide are added in above-mentioned mixed solution, ultrasonic 15min
Afterwards, 12h is stirred at room temperature；Magnet separates after reaction, and repeatedly washs (V:V with ethyl alcohol and the mixed liquor of deionized water
=1:1)；12h is dried under conditions of 323K with vacuum drying oven, obtains product 8.
The MnFe of embodiment 10:Se doping2O4The preparation of/ZIF-67- poly acrylic acid-poly acrylamide adsorbent material
It weighs 100mg ZIF-67 and 500mg polyacrylic acid to be added in 50m n,N-Dimethylformamide, ultrasound
30min makes system be uniformly dispersed；Again by 2mmol FeCl3.6H2O、1mmol MnCl2、1mmol Na2SeO4, 0.5g urea exists
Above-mentioned solution is successively dissolved under ultrasound condition, ultrasonic 30min is sufficiently mixed system, evenly dispersed；Then this solution is transferred to
In the high-pressure sealed reaction kettle of 150ml stainless steel polytetrafluoroethylene (PTFE), 200 DEG C of constant temperature 12h in constant temperature oven；With deionized water and second
Alcohol repeatedly washs, and dries 12h under conditions of 323K with vacuum drying oven, dried product exhibited is dispersed in DMF；Then will
500mg N, N- Dicyclohexylcarbodiimide, 40ml 2.5g/L polyacrylamide are added in above-mentioned mixed solution, ultrasonic 15min
Afterwards, 12h is stirred at room temperature；Magnet separates after reaction, and repeatedly washs (V:V with ethyl alcohol and the mixed liquor of deionized water
=1:1)；12h is dried under conditions of 323K with vacuum drying oven, obtains product 9.
The MnFe of embodiment 11:Se doping2O4The preparation of/ZIF-67- poly acrylic acid-poly acrylamide adsorbent material
It weighs 100mg ZIF-67 and 500mg polyacrylic acid to be added in 50m n,N-Dimethylformamide, ultrasound
30min makes system be uniformly dispersed；Again by 2mmol FeCl3.6H2O、1mmol MnCl2、1mmol Na2SeO4, 0.5g urea exists
Above-mentioned solution is successively dissolved under ultrasound condition, ultrasonic 30min is sufficiently mixed system, evenly dispersed；Then this solution is transferred to
In the high-pressure sealed reaction kettle of 150ml stainless steel polytetrafluoroethylene (PTFE), 200 DEG C of constant temperature 12h in constant temperature oven；With deionized water and second
Alcohol repeatedly washs, and dries 12h under conditions of 323K with vacuum drying oven, dried product exhibited is dispersed in DMF；Then will
500mg N, N- Dicyclohexylcarbodiimide, 20ml 2.5g/L polyacrylamide are added in above-mentioned mixed solution, ultrasonic 15min
Afterwards, 12h is stirred at room temperature；Magnet separates after reaction, and repeatedly washs (V:V with ethyl alcohol and the mixed liquor of deionized water
=1:1)；12h is dried under conditions of 323K with vacuum drying oven, obtains product 10.
The test of Hg absorption property has been carried out to the adsorption production 1-10 prepared in above-described embodiment 2-11.Specific test side
Method is: preparing the Hg solution of 100mg/L, measures the conical flask that 50ml is respectively placed in 100ml with pipette, adjusting pH value is 7 left
The right side is separately added into above-mentioned adsorbent material 0.05g into 10 conical flasks, and 10h, magnet point are stirred at 30 DEG C with constant temperature oscillator
From a small amount of supernatant is taken, unadsorbed Hg concentration is detected with Atomic absorption.Experimental data is as shown in table 1.Adsorption efficiency=(Hg
Residual concentration after initial concentration-absorption)/Hg initial concentration.
Table 1
Fig. 1 is to be tested using the embodiment of the present invention 8 i.e. circulation absorption of product 7, there it can be seen that being repeated 5 times absorption
After Hg solution, its adsorption efficiency can still keep 96% or more after sorption cycle, illustrate that adsorbent material prepared by the present invention can
To reuse well.
Claims (8)
1. a kind of preparation method of mercury absorbent, which is characterized in that metal-organic framework materials ZIF-67 and polyacrylic acid exist
Ultrasound is to scattering completely in n,N-Dimethylformamide, then by molysite, manganese salt, sodium selenate and urea under ultrasound condition successively
It being dissolved in above-mentioned solution, ultrasound is evenly dispersed up to system, which is carried out hydro-thermal reaction at 120 ~ 200 DEG C, filter,
Washing, drying, obtain product A, product A are dispersed in DMF, by N, N- Dicyclohexylcarbodiimide, polyacrylamide solution
It is added thereto, after ultrasonic disperse, is stirred to react at room temperature, obtain the adsorbent material.
2. the method as described in claim 1, which is characterized in that concentration of the ZIF-67 in n,N-Dimethylformamide is 2 ~ 5
g/L。
3. the method as described in claim 1, which is characterized in that the mass ratio of ZIF-67 and polyacrylic acid and molysite is 1:4 ~ 6:
5~6。
4. the method as described in claim 1, which is characterized in that molysite, manganese salt, the molar ratio of sodium selenate and urea are 2:1:
0.5~2:8~12。
5. the method as described in claim 1, which is characterized in that the time of hydro-thermal reaction is 10 ~ 15 h.
6. the method as described in claim 1, which is characterized in that the quality of N, N- Dicyclohexylcarbodiimide and polyacrylamide
Than for 5 ~ 20:1.
7. the method as described in claim 1, which is characterized in that the mass ratio of polyacrylamide and ZIF-67 are 0.5 ~ 1:1.
8. the mercury absorbent of preparation method preparation as claimed in claim 1.
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