CN103223333A - Di-amidoxime group containing modified silica gel adsorbent and preparation method thereof - Google Patents
Di-amidoxime group containing modified silica gel adsorbent and preparation method thereof Download PDFInfo
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Abstract
Belonging to the field of modified silica gel adsorbents, the invention particularly relates to a di-amidoxime group containing modified silica gel adsorbent specific to heavy metal copper ions in an adsorption solution and a preparation method thereof. The preparation method includes: taking silica gel as a starting raw material, conducting activation by a methanesulfonic acid solution, performing impregnation in a toluene solution of KH550, carrying out drying, then adding the obtained dry particles into an N, N-dimethylformamide solution of acrylonitrile to undergo first modification, and carrying out a treatment, then adding the dried first modified particles into a mixed solution of a hydroxylamine hydrochloride solution and a sodium carbonate solution to perform second modification, and conducting a treatment, thus obtaining dried second modified particles, i.e. a di-amidoxime group containing modified silica gel adsorbent finished product. The di-amidoxime group involved in the invention can be chelated with a heavy metal, thus having a strong adsorption effect on heavy metal copper ions. And compared with single-oxime group adsorbents, the di-amidoxime group containing modified silica gel adsorbent disclosed in the invention has substantially improved adsorption performance on copper ions, and the adsorption capacity is increased to 30mg/g.
Description
Technical field
The invention belongs to modified silica-gel adsorbent field, particularly relate to modified silica-gel adsorbent that contains two amidoxime groups at heavy metal copper ion in the adsorbent solution and preparation method thereof.
Background technology
As everyone knows, along with the fast development of Chinese national economy, environmental pollution and the economy of deriving thereof and social concern manifest day by day.The protection of water environment, deterioration and administer and also more and more cause the extensive concern of various circles of society are particularly to the improvement of heavy metal-polluted water.The research and development utility model is administered technology fwaater resources protection, human life's health and economy, social sustainable development is had theory and practical significance.
In numerous heavy metal water body treatment technologies, the adsorption and enrichment of water body weight metal ion is simple because of method, and operating simple and easy and removing many advantages such as efficient height has become this respect theory and Research on Practical Application focus.Superfine people is in " applied chemistry " in high, and 2010,27(3): " graft type amidoxim resin/SiO that 313-316 delivers
2The preparation of function composite particles " in the literary composition, adopt solution polymerization process, with acrylonitrile grafting to silica gel particle through the KH570 modification, after through the amidoxim reaction, make the sorbing material that contains amidoxime group.But still have the following disadvantages: 1. the adsorption equilibrium time is long; 2. not good to the low-concentration heavy metal adsorption effect; 3. grafting degree is not high.Chinese patent CN101596449A, a kind of preparation method of amidoxime group uranium extraction sorbent, this patent is with the titanium dioxide blending oximate of acrylonitrile powder and collosol and gel preparation, and make hydridization amidoxime group uranium extraction material, but still have the following disadvantages: 1. the gained mechanical strength is not enough; 2. material is not high to the adsorbance of uranium; Chinese patent CN101357325A, a kind of globular cellulose chelate sorbent and preparation side-Fa thereof that contains amidoxime group and carboxyl, this patent utilization acrylonitrile and Graft Copolymerization of Cellulose, after saponification, oximate, make a kind of globular cellulose chelate sorbing material that contains amidoxime group and carboxyl, but still have the following disadvantages: 1. grafting degree is not high; 2. the material adsorptive selectivity is not high; 3. it is not good that the material specific area causes adsorption effect inadequately greatly.Chinese patent CN101954268A, a kind of preparation method of water body weight metal ion adsorbent, this patent utilization sulfhydryl compound modified nano-titanium dioxide, make a kind of nano titanium oxide sorbing material that contains sulfydryl, but still have the following disadvantages: the nanoscale sorbing material is not easily separated after using, and may cause secondary pollution.The pottery front yard waits the people in " chemical research and application " earlier, 2003, the amidoxime group fiber of mentioning in " the amidoxime group fiber is to the adsorption dynamics adsorption kinetics of copper (II) " literary composition that 6:823-825 delivers is 9.8mg/g to the adsorbance of copper ion, still exists the adsorbance of the copper ion deficiency that waits on the low side.
In order to overcome these deficiencies, the present invention carries out the modified silica-gel adsorbent that modification obtains containing two amidoxime groups with the silica gel absorber that chemical property is stable, mechanical strength is high, with the heavy metal copper ion in its absorption waste water.
Summary of the invention
The technical problem that solves:The present invention overcomes the deficiencies in the prior art and proposes a kind of modified silica-gel adsorbent that contains two amidoxime groups and preparation method thereof, the present invention carries out modification to the silica gel absorber that chemical property is stable, mechanical strength is high, obtain containing the modified silica-gel adsorbent of two amidoxime groups, because of it contains two amidoxime group counterweight metal copper ions stronger suction-operated is arranged, and compare with single amidoxime group, absorption property significantly improves.
Technical scheme:The present invention adopts inorganic material silica gel and a kind of modified silica-gel adsorbent that contains two amidoxime groups of the compound preparation of organic material acrylonitrile, and its structural formula is:
According to a kind of modified silica-gel adsorbent that contains two amidoxime groups of the present invention, it is characterized in that getting by the following steps preparation:
Step 4, modification:
(1) dried particles that the 5g step 3 is obtained joins the N of 100mL acrylonitrile, in dinethylformamide (DMF) solution, wherein the acrylonitrile volumetric concentration is 15%, feed nitrogen then, get rid of the air in the bottle, add 0.1g initator azodiisobutyronitrile again, 65-85 ℃ of following condensing reflux and lasting the stirring 5 hours, the reaction back is filtered and is obtained modified particles one time, and with N, dinethylformamide is that extractant extracted in apparatus,Soxhlet's 24 hours, remove silica gel surface unreacted acrylonitrile, obtain flooding modified particles one time, and, obtain drying modified particles one time in 50 ℃ of following vacuum dryings 24 hours;
(2) be that hydroxylamine hydrochloride solution and the 20mL concentration of 1mol/L is that the sodium carbonate liquor of 1mol/L mixes with 20mL concentration, the back adds the modified particles of oven dry that obtains in the 1g step 4 (1), feed nitrogen then, remove the air in the bottle, 70 ℃ of following condensing refluxes and lasting the stirring 6 hours, the reaction back is filtered and is obtained twice-modified particle, it is neutral purifying to cleaning solution with the distilled water cyclic washing again, be purified twice-modified particle, and 50 ℃ of following vacuum dryings 24 hours, obtain drying twice-modified particle, be the modified silica-gel adsorbent finished product that contains two amidoxime groups.
The modified silica-gel preparation of adsorbent principle that contains two amidoxime groups of the present invention is to be raw material with silica gel, activate through methanesulfonic acid, be washed till neutral oven dry back and coupling agent KH550 (gamma-aminopropyl-triethoxy-silane) reaction, amino is linked silica gel particle surface, obtain modified particles KH550-SiO
2Under the initiation of azodiisobutyronitrile, two keys on the acrylonitrile and modified particles KH550-SiO
2On amino polymerization, obtain AN-SiO
2At last, the azanol of hydroxylamine hydrochloride and sodium carbonate reaction release is with AN-SiO
2Cyano group in the particle is converted into amidoxime group, thereby obtains containing the modified silica-gel adsorbent A O-SiO of two amidoxime groups
2
Beneficial effect:The modified silica-gel adsorbent that contains two amidoxime groups of the present invention compared with prior art, mechanical strength height, regenerability are good; The two amidoxime group groups that contain can more effectively produce chelation with heavy metal, and then can better adsorb the heavy metal ion in the waste water, and compare with existing single amidoxime group adsorbent, to Cu
2+Absorption property significantly improve, adsorbance is brought up to the 30mg/g adsorbent.
Description of drawings:
Fig. 1 is the flow chart of adsorbent preparation of the present invention;
Fig. 2 is the reaction unit connection layout: 1 is stirring rod, and 2 is the polytetrafluoroethylene (PTFE) plug, and 3 is thermometer, and 4 is thermometer boss, 5
Be condenser west tube, 6 is there-necked flask, and 7 is the condensed water import, and 8 is condensation-water drain;
Fig. 3 is the graph of a relation that KH550 grafting silica gel and acrylonitrile compolymer reaction temperature influence absorption property;
Fig. 4 is the graph of a relation of adsorbent consumption and adsorbance;
Fig. 5 is the kinetic curve figure of adsorbent;
Fig. 6 is the Changing Pattern figure of adsorbents adsorb performance with the pH value;
Fig. 7 is the adsorption isotherm of adsorbent;
Fig. 8 is the variation diagram of adsorbents adsorb performance with multiplexing number.
The specific embodiment
Following embodiment further specifies of the present invention, rather than limits the scope of the invention.
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
In conjunction with Fig. 1, a kind of modified silica-gel preparation of adsorbent method that contains two amidoxime groups that the present invention proposes may further comprise the steps:
Step 4, modification:
(1) dried particles that the 5g step 3 is obtained joins the N of 100mL acrylonitrile, in dinethylformamide (DMF) solution, wherein the volumetric concentration of acrylonitrile is 15%, the nitrogen of feeding then, get rid of the air in the bottle, add 0.1g initator azodiisobutyronitrile again, 65-85 ℃ of following condensing reflux and lasting the stirring 5 hours, a modified particles that obtains is filtered in the reaction back, and with N, dinethylformamide is that extractant extracted in apparatus,Soxhlet's 24 hours, remove silica gel surface unreacted acrylonitrile, obtain flooding modified particles one time, and, obtain drying modified particles one time in 50 ℃ of following vacuum dryings 24 hours;
(2) be that hydroxylamine hydrochloride solution and the 20mL concentration of 1mol/L is that the sodium carbonate liquor of 1mol/L mixes with 20mL concentration, the back adds the modified particles of oven dry that obtains in the 1g step 4 (1), feed nitrogen then, remove the air in the bottle, 70 ℃ of condensing refluxes and lasting the stirring 6 hours, the reaction back is filtered and is obtained twice-modified particle, it is neutral purifying to cleaning solution with the distilled water cyclic washing again, be purified twice-modified particle, and 50 ℃ of following vacuum dryings 24 hours, obtain drying twice-modified particle, be the modified silica-gel adsorbent finished product that contains two amidoxime groups.
Embodiment 1:
Step 4, modification:
(1) dried particles that the 5g step 3 is obtained joins the N of 100mL acrylonitrile, in dinethylformamide (DMF) solution, wherein the volumetric concentration of acrylonitrile is 15%, the nitrogen of feeding then, get rid of the air in the bottle, add 0.1g initator azodiisobutyronitrile again, at 65 ℃ of following condensing refluxes and continued to stir 5 hours, a modified particles that obtains is filtered in the reaction back, and with N, dinethylformamide is that extractant extracted in apparatus,Soxhlet's 24 hours, remove silica gel surface unreacted acrylonitrile, obtain flooding modified particles one time, and, obtain drying modified particles one time in 50 ℃ of following vacuum dryings 24 hours;
(2) be that hydroxylamine hydrochloride solution and the 20mL concentration of 1mol/L is that the sodium carbonate liquor of 1mol/L mixes with 20mL concentration, the back adds the modified particles of oven dry that obtains in the 1g step 4 (1), feed nitrogen then, remove the air in the bottle, 70 ℃ of condensing refluxes and lasting the stirring 5 hours, the reaction back is filtered and is obtained twice-modified particle, it is neutral purifying to cleaning solution with the distilled water cyclic washing again, be purified twice-modified particle, and 50 ℃ of following vacuum dryings 24 hours, obtain drying twice-modified particle, be the modified silica-gel adsorbent finished product that contains two amidoxime groups.
Embodiment 2:
Repeat the step 1 to three among the embodiment 1
Step 4, modification:
(1) dried particles that the 5g step 3 is obtained joins the N of 100mL acrylonitrile, in dinethylformamide (DMF) solution, wherein the volumetric concentration of acrylonitrile is 15%, feed nitrogen then, get rid of the air in the bottle, add 0.1g initator azodiisobutyronitrile again, at 75 ℃ of following condensing refluxes and continued to stir 5 hours, a modified particles that obtains is filtered in the reaction back, and with N, dinethylformamide is that extractant extracted in apparatus,Soxhlet's 24 hours, remove silica gel surface unreacted acrylonitrile, obtain flooding modified particles one time, and, obtain drying modified particles one time in 50 ℃ of following vacuum dryings 24 hours;
(2) be that hydroxylamine hydrochloride solution and the 20mL concentration of 1mol/L is that the sodium carbonate liquor of 1mol/L mixes with 20mL concentration, the back adds the modified particles of oven dry that obtains in the 1g step 4 (1), feed nitrogen then, remove the air in the bottle, 70 ℃ of condensing refluxes and lasting the stirring 5 hours, the reaction back is filtered and is obtained twice-modified particle, it is neutral purifying to cleaning solution with the distilled water cyclic washing again, be purified twice-modified particle, and 50 ℃ of following vacuum dryings 24 hours, obtain drying twice-modified particle, be the modified silica-gel adsorbent finished product that contains two amidoxime groups.
Embodiment 3:
Repeat the step 1 to three among the embodiment 1
Step 4, modification:
(1) dried particles that the 5g step 3 is obtained joins the N of 100mL acrylonitrile, in dinethylformamide (DMF) solution, wherein the volumetric concentration of acrylonitrile is 15%, feed nitrogen then, get rid of the air in the bottle, add 0.1g initator azodiisobutyronitrile again, at 85 ℃ of following condensing refluxes and continued to stir 5 hours, a modified particles that obtains is filtered in the reaction back, and with N, dinethylformamide is that extractant extracted in apparatus,Soxhlet's 24 hours, remove silica gel surface unreacted acrylonitrile, obtain flooding modified particles one time, and, obtain drying modified particles one time in 50 ℃ of following vacuum dryings 24 hours;
(2) be that hydroxylamine hydrochloride solution and the 20mL concentration of 1mol/L is that the sodium carbonate liquor of 1mol/L mixes with 20mL concentration, the back adds the modified particles of oven dry that obtains in the 1g step 4 (1), feed nitrogen then, remove the air in the bottle, 70 ℃ of condensing refluxes and lasting the stirring 5 hours, the reaction back is filtered and is obtained twice-modified particle, it is neutral purifying to cleaning solution with the distilled water cyclic washing again, be purified twice-modified particle, and 50 ℃ of following vacuum dryings 24 hours, obtain drying twice-modified particle, be the modified silica-gel adsorbent finished product that contains two amidoxime groups.
Embodiment 4:
Utilize the AO-SiO for preparing among the embodiment 1-3
2Copper ion in the adsorbents adsorb solution.
(1) AO-SiO of preparation among the embodiment 1
2Adsorbent
Get the copper ion solution of a series of 50mL variable concentrations, all add the AO-SiO of preparation among the 0.075g embodiment 1
2Adsorbent, constant temperature vibration 2h, treat that absorption reaches balance after, take out solution, and with supercentrifuge centrifugal after, the concentration of copper ion in the mensuration supernatant is according to following formula
Obtain adsorbance.Draw the graph of relation of equilibrium concentration and adsorbance, see Fig. 3.
In the formula:
Be adsorbance (mg/g),
Be the concentration (mg/L) of copper ion in the solution before adsorbing,
Be the concentration (mg/L) of copper ion in the solution after adsorbing,
Be liquor capacity (L),
Be adsorbent mass (g).
(2) AO-SiO of preparation among the embodiment 2
2Adsorbent
Get the copper ion solution of a series of 50mL variable concentrations, all add the AO-SiO of preparation among the 0.075g embodiment 2
2Adsorbent, constant temperature vibration 2h, treat that absorption reaches balance after, take out solution, and with supercentrifuge centrifugal after, the concentration of copper ion is obtained adsorbance in the mensuration supernatant.Draw the graph of relation of equilibrium concentration and adsorbance, see Fig. 3.
(3) AO-SiO of preparation among the embodiment 3
2Adsorbent
Get the copper ion solution of a series of 50mL variable concentrations, all add the AO-SiO of preparation among the 0.075g embodiment 3
2Adsorbent, constant temperature vibration 2h, treat that absorption reaches balance after, take out solution, and with supercentrifuge centrifugal after, the concentration of copper ion is obtained adsorbance in the mensuration supernatant.Draw the graph of relation of equilibrium concentration and adsorbance, see Fig. 3.
From accompanying drawing 3 as can be seen, when KH550 grafting silica gel and acrylonitrile compolymer temperature were 75 ℃, gained adsorbents adsorb performance was best.
Embodiment 5:
Utilize the AO-SiO of preparation among the embodiment 2
2Copper ion in the adsorbents adsorb solution.
(1) influence of adsorbent consumption
The copper ion solution that to get a series of 50mL concentration be 20mg/L adds the adsorbents of different amounts respectively in tool plug conical flask, take out solution, and with supercentrifuge centrifugal after, the concentration of copper ion in the mensuration supernatant.According to following formula
Obtain adsorbance, and draw the relation curve of adsorbance-consumption, see Fig. 4.Along with the increase of consumption, adsorbance reduces gradually as can be seen, but consumption is too small, can cause eliminating rate of absorption to descend, and therefore, must select a moderate consumption for use, selects 1g/L herein for use.
In the formula:
Be adsorbance (mg/g),
Be the concentration (mg/L) of copper ion in the solution before adsorbing,
Be the concentration (mg/L) of copper ion in the solution after adsorbing,
Be liquor capacity (L),
Be adsorbent mass (g).
(2) adsorption dynamics adsorption kinetics
The copper ion solution of getting 200mL concentration and be 50mg/L adds the 0.15g adsorbent in tool plug conical flask, constant temperature in constant temperature oscillator (25 ℃) vibration, at interval certain hour take out solution and with supercentrifuge centrifugal after, measure the concentration of copper ion in the supernatant.According to following formula
, obtain adsorbance
And draw adsorbance-time relation curve, see Fig. 5.As can be seen from the figure, it is shorter that adsorbent reaches equilibration time to the absorption of copper ion, and absorption has just reached balance about 10min substantially.
In the formula:
Be adsorbance (mg/g),
Be the concentration (mg/L) of copper ion in the solution before adsorbing,
The concentration of copper ion (mg/L) in the etching solution during for t,
Be liquor capacity (L),
Be adsorbent mass (g).
(3) influence of pH value
The copper ion solution that to get a series of 50mL concentration be 20mg/L is in tool plug conical flask, add the 0.0375g adsorbent respectively, under condition of different pH, constant temperature vibration 2h, treat that absorption reaches balance after, take out solution, and with supercentrifuge centrifugal after, measure the concentration of copper ion in the supernatant, obtain adsorbance, and draw out the relation curve of adsorbance-pH value, see Fig. 6.In pH＜6 o'clock, adsorbance increases along with the increase of pH value as can be seen, and actual waste water pH value is faintly acid or neutrality, so this is favourable to actual water treatment.
(4) adsorption isotherm model
Get the copper ion solution of a series of 50mL variable concentrations, all add the 0.0375g adsorbent, constant temperature vibration 2h, after treating that absorption reaches balance, take out solution, and with supercentrifuge centrifugal after, measure the concentration of copper ion in the supernatant, obtain adsorbance, and draw the relation curve of adsorbance-equilibrium concentration, see Fig. 7.As can be seen, increase along with solution concentration, adsorbance increases gradually, when effects of ion concentration reaches 100mg/L, adsorbance no longer increases along with the increase of concentration, maximal absorptive capacity reaches 30mg/g, and the 9.8mg/g that compares in " the amidoxime group fiber is to the adsorption dynamics adsorption kinetics of copper (II) " literary composition that people such as Tao Tingxian deliver in " chemical research and application " improves greatly.
Embodiment 6:
Investigate the recycling performance of made adsorbent.
Utilize embodiment 5(3) in pH be 5.5 o'clock adsorbents behind the absorbing copper ion, with 0.1mol/L watery hydrochloric acid cyclic washing,, be washed with distilled water to cleaning solution neutrality, 50 ℃ of following vacuum drying to remove the copper ion that adsorbs it on.Get above-mentioned multiplexing adsorbent 0.0375g, join in the copper ion solution that 50mL concentration is 50mg/L, constant temperature in constant temperature oscillator (25 ℃) vibration.Carry out this series of steps repeatedly, investigate the variation of adsorbance along with multiplexing number.See Fig. 8.After recycling 5 times, adsorbance remains unchanged substantially, illustrates that regneration of adsorbent material is functional as can be seen.The invention has the advantages that an amino group can with bimolecular acrylonitrile polymerization, through oximate, form two oximido groups, a large amount of amino and hydroxyl and heavy metal produce chelation on it, make adsorption particle to the heavy metal copper ion ratio monoxime base group in the solution stronger suction-operated be arranged, adsorption capacity reaches 30mg/g.
Claims (3)
1. modified silica-gel adsorbent that contains two amidoxime groups is characterized in that chemical structural formula is:
2. a modified silica-gel preparation of adsorbent method that contains two amidoxime groups is characterized in that with silica gel being initiation material, and is activated → dipping → drying → modification, and makes the modified silica-gel adsorbent finished product that contains two amidoxime groups, and its concrete steps are as follows:
Step 1, activation: it is 5% pyrovinic acid solution that 30g 100-200 purpose column chromatography silica gel is placed the 150mL volumetric concentration, at 90 ℃ of following condensing refluxes and continue to stir 4 hours, reaction is finished the back and is repeated flushing with distilled water and be neutrality until cleaning solution, and in 50 ℃ of following vacuum dryings 24 hours;
Step 2, dipping: the activated silica gel that the 10g step 1 is obtained joins in the toluene solution of 150mL KH550, wherein the volumetric concentration of KH550 is 10%, 70 ℃ of following condensing refluxes and lasting the stirring 24 hours, filter coarse granule, be that extractant extracted in apparatus,Soxhlet's 24 hours then with toluene, remove the unreacted KH550 in silica gel surface, obtain impregnated granules;
Step 3, drying: the impregnated granules that step 2 is obtained obtains dried particles 50 ℃ of following vacuum drying 24 hours;
Step 4, modification:
(1) dried particles that the 5g step 3 is obtained joins the N of 100mL acrylonitrile, in the dinethylformamide solution, wherein the volumetric concentration of acrylonitrile is 15%, feed nitrogen then, get rid of the air in the bottle, add 0.1g initator azodiisobutyronitrile again, 65-85 ℃ of following condensing reflux and lasting the stirring 5 hours, the reaction back is filtered and is obtained modified particles one time, and with N, dinethylformamide is that extractant extracted in apparatus,Soxhlet's 24 hours, remove silica gel surface unreacted acrylonitrile, obtain flooding modified particles one time, and, obtain drying modified particles one time in 50 ℃ of following vacuum dryings 24 hours;
(2) be that hydroxylamine hydrochloride solution and the 20mL concentration of 1mol/L is that the sodium carbonate liquor of 1mol/L mixes with 20mL concentration, the back adds the modified particles of oven dry that obtains in the 1g step 4 (1), feed nitrogen then, remove the air in the bottle, 70 ℃ of following condensing refluxes and lasting the stirring 6 hours, the reaction back is filtered and is obtained twice-modified particle, it is neutral purifying to cleaning solution with the distilled water cyclic washing again, be purified twice-modified particle, and 50 ℃ of following vacuum dryings 24 hours, obtain drying twice-modified particle, be the modified silica-gel adsorbent finished product that contains two amidoxime groups.
3. the modified silica-gel preparation of adsorbent method that contains two amidoxime groups according to claim 2 is characterized in that the reaction temperature in the step 4 (1) is 75 ℃.
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| CN108654558A (en) * | 2018-04-26 | 2018-10-16 | 武汉理工大学 | A kind of X-type zeolite and preparation method thereof being modified together with amidoxime, to the adsorption applications of ruthenium and caesium |
| US11369703B2 (en) | 2018-08-31 | 2022-06-28 | Genzyme Corporation | Sterile chromatography resin and use thereof in manufacturing processes |
| CN113101876A (en) * | 2021-03-10 | 2021-07-13 | 西南科技大学 | Preparation method of porous ordered efficient photothermal conversion material |
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