The preparation of heavy metal/hydrophobicity ppcps composite material in a kind of removal recycled water
Method
Technical field
The present invention relates to recycled water further treatment techniques, and in particular to heavy metal in a kind of efficiently removal recycled water/hydrophobic
The preparation method of the composite material of property ppcps.
Background technique
Drug and personal care articles (PPCPs) are a kind of novel micropollutants, have environmental stability, refractory organics and
The features such as bioaccumulation, Long Term Contact can cause irreversible potential hazard to human health and ecological environment, therefore, carry out
The removal technology of PPCPs has important theory to the sustainable development of urban sewage recycling in China cause and shows in regenerated recycle-water
Sincere justice.Directly living indirectly from metal plating in addition, heavy metal, especially nickel, chromium, cadmium, lead, mercury etc., mining or is made chemical fertilizer
It is discharged into water body in the industries such as paper, these heavy metals often have carcinogenicity and bioaccumulation, interfere the life of living tissue
Function is managed, preferential environmental contaminants are presently believed to be.
Since the traditional biologic treating technique in municipal sewage plant is limited to PPCPs removal effect, recent domestic
Carry out correlative study around advanced oxidation, film filtering, activated carbon adsorption and combined technical method.High-level oxidation technology (AOPs) is logical
It crosses the degradable of the strong oxidizing property realization PPCPs of free radical (based on OH) or improves its biochemical, wherein photochemical catalyst skill
Art is used widely, and the technology is preferable to trace contaminant removal effect, but the reunion of ultra-fine photochemical catalyst in the solution is existing
As if an important factor for influencing photocatalysis effect.Absorption is a kind of efficiently feasible PPCPs removing sulfuldioxide, at low cost, easy to operate,
No coupling product generates and removal efficiency is higher, but effective recycling of adsorbent is problem to be solved.
Summary of the invention
To solve the above problems, it is an object of the invention to successfully prepare it is a kind of can effectively remove in recycle-water heavy metal and
The composite material of hydrophobicity ppcps, and the composite material can realize temperature control recycling by the modification of Thermo-sensitive material.
In removal recycled water provided by the invention the preparation method of heavy metal/hydrophobicity ppcps composite material include with
Lower step:
1) nano cuprous oxide is synthesized using hydro-thermal method;
2) using the nano oxidized Asia of step 1) preparation, using one-step synthesis method Thermo-sensitive carboxymethyl cyclodextrin-Cu2O is multiple
Condensation material.
Step 1) specifically: after mixing by copper-bath and sodium hydroxide solution, excessive ascorbic acid is added
Solution after magnetic agitation mixes well, is placed in reaction kettle and reacts, and separates solid product, obtains nano cuprous oxide.It is described
The concentration of NaOH solution is 5mol/L, CuSO4The concentration of solution is 1mol/L, and the concentration of ascorbic acid solution is 1.5mol/L.
The CuSO4, NaOH, the molar ratio of ascorbic acid is 1:15:(2-2.5).The reaction, reaction temperature are 120-135 DEG C, instead
Answering pressure is 1.2-2.0MPa, reaction time 8h-12h.The separation solid product specifically: filter residue is filtered to take, it is primary to use
Clear 3-5 times of dehydrated alcohol, distilled water difference, vacuum drying.The vacuum drying, vacuum degree 1200-4800pa, temperature are
55-60 DEG C, time 2-20h.
The step 2) specifically: nano cuprous oxide prepared by step 1) is dispersed in distilled water, carboxylic is then added
Methyl flamprop and poly-N-isopropyl acrylamide, sodium hydrogensulfite, magnetic agitation reaction and ultrasonic disperse are at suspension, separation
Purification is to get heavy metal/hydrophobicity ppcps composite material in removal recycled water.The nano cuprous oxide, carboxymethyl ring paste
Smart, poly-N-isopropyl acrylamide mass ratio is 5:(2-3): (2-3).The matter of the sodium hydrogensulfite and nano cuprous oxide
Amount is than being 1:2-2:1;Concentration of the nano cuprous oxide in distilled water is 0.05-1g/mL.The reaction, in ice-water bath
It is carried out under the conditions of nitrogen protection, reaction time 40-52h.Cyclodextrin in the carboxymethyl cyclodextrin is alpha-cyclodextrin, β-
Cyclodextrin, one of gamma-cyclodextrin.The separating-purifying, specifically: supernatant is removed in centrifugation, and precipitating cleans 3-5 with deionized water
It is secondary, low-temperature vacuum drying.The low-temperature vacuum drying, vacuum degree 1200-4800pa, drying temperature are 30-40 DEG C, time 2-
20h。
Beneficial effect
The present invention is made using one-step method with considerable carboxymethyl cyclodextrin and poly-N-isopropyl acrylamide load capacity
Cuprous oxide composite material, carboxymethyl and heavy metal form complex in carboxymethyl cyclodextrin, and cyclodextrin hydrophobic cavity can
Efficient envelope retains hydrophobicity ppcps, and carboxymethyl cyclodextrin and photochemical catalyst interact, and not only reduces light induced electron-sky
The compound probability in cave, changes simultaneously the structure of photocatalyst surface, reduces photochemical catalyst because of the agglomeration of the small generation of partial size,
Photocatalytic degradation efficiency is promoted, the mineralization rate of ppcps, the Thermo-sensitive material poly-N-isopropyl acrylamide position of introducing are improved
In the outermost layer of the composite material, the dispersibility of material is enhanced, is conducive to the progress of light-catalyzed reaction and suction-operated
Meanwhile realize that composite material can shrink the performance of sedimentation completely under the high temperature conditions, realize the catalyst can by temperature control into
Row recycling.
Specifically:
1) on the basis of maturation prepares photochemical catalyst nano cuprous oxide, being considered as one-step method will have the present invention
There is coordination and tetra-inclusion complex carboxymethyl cyclodextrin and has the Thermo-sensitive material of mature application poly- in temperature sensitive direction
N-isopropyl acrylamide introduces photocatalysis field, which has obtained having considerable carboxymethyl cyclodextrin
With the composite material of poly-N-isopropyl acrylamide load capacity.
2) one kind prepared by the present invention efficiently removes heavy metal/hydrophobicity ppcps composite material in recycled water, carboxylic first
Cyclodextrin has both the effect of absorption heavy metal and envelope hydrophobicity ppcps, wherein carboxymethyl and heavy metal form ligand compound
Object, cyclodextrin hydrophobic cavity efficiently can retain hydrophobicity ppcps by envelope, that is, can be achieved at the same time to the efficient degradation of ppcps and right
The retention of heavy metal removes.
3) one kind prepared by the present invention efficiently removes heavy metal/hydrophobicity ppcps composite material in recycled water, carboxylic first
The photohole oxidative degradation cyclodextrin that cyclodextrin and photocatalyst surface are generated by interaction of hydrogen bond, guidance catalyst
The hydrophobicity ppcps of interior envelope reduces the compound probability of photo-generate electron-hole;Meanwhile carboxymethyl cyclodextrin is in photochemical catalyst
Cuprous oxide adsorption changes the structure of photocatalyst surface, reduces photochemical catalyst because of the agglomeration of the small generation of partial size,
More than, collective effect promotes photocatalytic degradation efficiency, improves the mineralization rate of ppcps.
4) one kind prepared by the present invention efficiently removes heavy metal/hydrophobicity ppcps composite material in recycled water, the material
Thermo-sensitive material poly-N-isopropyl acrylamide in material is located at the outermost layer of the composite material, enhances the dispersible of material
Property, be conducive to the progress of light-catalyzed reaction and suction-operated;Meanwhile volume becomes smaller the material under the high temperature conditions, can receive completely
Shrink mark drop, realizing the catalyst can be recycled by temperature control.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, it is obtained by those of ordinary skill in the art without making creative efforts it is every other apply example, all belong to
In the scope of protection of the invention.
Embodiment 1
A kind of efficient preparation method for removing heavy metal/hydrophobicity ppcps composite material in recycled water, the composite wood
Material includes photochemical catalyst cuprous oxide, carboxymethyl cyclodextrin, Thermo-sensitive material poly-N-isopropyl acrylamide, the composite wood
The preparation method of material specifically:
1) nano cuprous oxide is synthesized using hydro-thermal method: a certain amount of copper-bath and sodium hydroxide solution is mixed equal
After even, excessive ascorbic acid solution is added, and (concentration of NaOH solution is 5mol/L, CuSO4The concentration of solution is 1mol/L, is resisted
The concentration of bad hematic acid solution is 1.5mol/L.CuSO4, NaOH, the molar ratio of ascorbic acid is 1:15:2), magnetic agitation is abundant
After mixing, be placed in reaction kettle high temperature reaction under high pressure 8h (120 DEG C, 1.2MPa), solution taken to filter, and with respectively ethyl alcohol, distillation
Water successively cleans 3 times, and being placed in vacuum oven drying can (vacuum degree 1200pa, temperature be 55 DEG C, time 2h).2)
Using one-step synthesis method Thermo-sensitive carboxymethyl cyclodextrin-Cu2O composite material: a certain amount of cuprous oxide is dispersed in and fills steaming
In the flask of distilled water, a certain amount of carboxymethyl cyclodextrin and poly-N-isopropyl acrylamide, sodium hydrogensulfite (nanometer is then added
Cuprous oxide, carboxymethyl cyclodextrin, poly-N-isopropyl acrylamide mass ratio be 5:2:2;Sodium hydrogensulfite with it is nano oxidized
Cuprous mass ratio is 1:2;Concentration of the nano cuprous oxide in distilled water is 0.05g/mL), in ice-water bath and nitrogen
Under protection, simultaneously ultrasonic disperse is centrifuged magnetic agitation 40h at suspension, removes supernatant unreacting substance, deionized water cleaning 3
It is secondary, by product vacuum low temperature drying (vacuum degree 1200pa, drying temperature are 30 DEG C, time 2h) to get the composite material;
Specifically further relating to cyclodextrin is alpha-cyclodextrin.
The composite material (0.1g) of preparation is for the 0.02mg/L galaxolide solution and containing 0.02mg/L heavy metal of degrading
The solution (100mL) of (pb, cd, Ni) is placed under the natural light conditional that temperature is 25 DEG C and reacts, galaxolide is measured after 12h
Removal rate with heavy metal is 94%, 82%, 86%, 89%.Photocatalysis performance test, experiment are carried out to composite material
The preceding composite material under dark condition reaches adsorption equilibrium, and lighting process is then carried out under equal conditions, and photochemical catalyst oxidation is sub-
Copper improves about 1.23 times and 1.09 times with heavy metal removing rate for galaxolide, while measuring water body small molecular organic matter
Type dramatically increases, and improves 1.3 times compared to individual photochemical catalyst cuprous oxide catalysis efficiency.After 12h, water temperature is controlled
It is 40 DEG C or so, which is gradually tapered up by the colorless and transparent body dissolved, sedimentation is shunk completely in 15-20min or so, from
Heart recycling, drying measure the rate of recovery 88% or so.The embodiment shows that the material has efficiently concentrating galaxolide and a huge sum of money
The function of category and photocatalytic degradation galaxolide;The composite material can realize material recovery by temperature control simultaneously.
Embodiment 2
A kind of efficient preparation method for removing heavy metal/hydrophobicity ppcps composite material in recycled water, the composite wood
Material includes photochemical catalyst cuprous oxide, carboxymethyl cyclodextrin, Thermo-sensitive material poly-N-isopropyl acrylamide, the composite wood
The preparation method of material specifically: 1) nano cuprous oxide is synthesized using hydro-thermal method: by a certain amount of copper-bath and hydroxide
After mixing, excessive ascorbic acid solution is added, and (concentration of NaOH solution is 5mol/L, CuSO to sodium solution4Solution it is dense
Degree is 1mol/L, and the concentration of ascorbic acid solution is 1.5mol/L.CuSO4, the molar ratio of NaOH, ascorbic acid are 1:15:
2.5) after, magnetic agitation mixes well, it is placed in reaction kettle high temperature reaction under high pressure 10h (135 DEG C, 2.0MPa), solution is taken to filter,
And successively cleaned 5 times with ethyl alcohol respectively, distilled water, being placed in the interior drying of vacuum oven can (reciprocal of duty cycle 4800pa, temperature 60
DEG C, time 20h).2) one-step synthesis method Thermo-sensitive carboxymethyl cyclodextrin-Cu is used2O composite material: by a certain amount of oxidation
It is cuprous to be dispersed in the flask for filling distilled water, a certain amount of carboxymethyl cyclodextrin and poly-N-isopropyl acryloyl is then added
Amine, sodium hydrogensulfite (nano cuprous oxide, carboxymethyl cyclodextrin, poly-N-isopropyl acrylamide mass ratio be 5:3:3;It is sub-
The mass ratio of sodium bisulfate and nano cuprous oxide is 2:1;Concentration of the nano cuprous oxide in distilled water is 0.5g/
ML), under ice-water bath and nitrogen protection, simultaneously ultrasonic disperse is centrifuged magnetic agitation 52h at suspension, removes supernatant unreacted
Substance, deionized water are cleaned 5 times, and by product vacuum low temperature drying, (vacuum degree 4800pa, drying temperature are 40 DEG C, and the time is
20h) to get the composite material.
Specifically further relating to cyclodextrin is beta-cyclodextrin.
The composite material (0.1g) of preparation is for 5 μ g/L galaxolides and the Diclofenac and 0.02mg/L heavy metal of degrading
The mixed solution (100mL) of (pb, cd, Ba) is placed under the natural light conditional that temperature is 25 DEG C and reacts, and measures plus finds pleasure in after 12h
The removal rate of Moschus and heavy metal is respectively 94%, 82%, 84%, 90%, and the removal rate to hydrophily Diclofenac is only
56%.Photocatalysis performance test is carried out to composite material, composite material reaches adsorption equilibrium under dark condition before experiment, then
Lighting process is carried out under equal conditions, photochemical catalyst cuprous oxide improves about 1.24 with heavy metal removing rate for galaxolide
Times and 1.05 times, while measuring water body small molecular organism kinds and dramatically increasing, aoxidized compared to individual photochemical catalyst sub-
Copper catalytic efficiency improves 1.3 times.After 12h, control water temperature is 38 DEG C or so, and the composite material is by the colorless and transparent body that dissolves
It gradually tapers up, shrinks sedimentation, centrifugation recycling completely in 15-20min or so, drying measures the rate of recovery 90% or so.The implementation
Example shows that the material has the function of efficiently concentrating galaxolide and heavy metal and photocatalytic degradation galaxolide, to hydrophobicity
The treatment effect of organic matter ppcps is more preferable;The composite material can realize material recovery by temperature control simultaneously.
Embodiment 3
A kind of efficient preparation method for removing heavy metal/hydrophobicity ppcps composite material in recycled water, the composite wood
Material includes photochemical catalyst cuprous oxide, carboxymethyl cyclodextrin, Thermo-sensitive material poly-N-isopropyl acrylamide, the composite wood
The preparation method of material specifically: 1) nano cuprous oxide is synthesized using hydro-thermal method: by a certain amount of copper-bath and hydroxide
After mixing, excessive ascorbic acid solution is added, and (concentration of NaOH solution is 5mol/L, CuSO to sodium solution4Solution it is dense
Degree is 1mol/L, and the concentration of ascorbic acid solution is 1.5mol/L.CuSO4, the molar ratio of NaOH, ascorbic acid are 1:15:
2.2) after, magnetic agitation mixes well, it is placed in reaction kettle high temperature reaction under high pressure 10h (130 DEG C, 1.7MPa), solution is taken to filter,
And successively cleaned 4 times with dehydrated alcohol respectively, distilled water, being placed in the interior drying of vacuum oven can (condition and 1 phase of embodiment
Together).2) one-step synthesis method Thermo-sensitive carboxymethyl cyclodextrin-Cu is used2O composite material: a certain amount of cuprous oxide is dispersed in
It fills in the flask of distilled water, a certain amount of carboxymethyl cyclodextrin and poly-N-isopropyl acrylamide, bisulfite is then added
Sodium (nano cuprous oxide, carboxymethyl cyclodextrin, poly-N-isopropyl acrylamide mass ratio be 5:3:3;Sodium hydrogensulfite with receive
The mass ratio of rice cuprous oxide is 1:1;Concentration of the nano cuprous oxide in distilled water is 0.8g/mL), in ice-water bath and
Under nitrogen protection, simultaneously ultrasonic disperse is centrifuged magnetic agitation 45h at suspension, removes supernatant unreacting substance, deionized water is clear
It washes 4 times, by product vacuum low temperature drying (condition is same as Example 1) to get the composite material.
Specifically further relating to cyclodextrin is gamma-cyclodextrin.
The composite material (0.1g) of preparation is for the 0.02mg/L tonalid solution and containing 0.02mg/L heavy metal of degrading
The solution (100mL) of (pb, cd, Ni) is placed under the natural light conditional that temperature is 25 DEG C and reacts, tonalid is measured after 12h
Removal rate with heavy metal is 93%, 82%, 86%, 89%.Photocatalysis performance test, experiment are carried out to composite material
The preceding composite material under dark condition reaches adsorption equilibrium, and lighting process is then carried out under equal conditions, and photochemical catalyst oxidation is sub-
Copper improves about 1.23 times and 1.09 times with heavy metal removing rate for tonalid, while measuring water body small molecular organic matter
Type dramatically increases, and improves 1.3 times compared to individual photochemical catalyst cuprous oxide catalysis efficiency.After 12h, water temperature is controlled
It is 40 DEG C or so, which is gradually tapered up by the colorless and transparent body dissolved, sedimentation is shunk completely in 15-20min or so, from
Heart recycling, drying measure the rate of recovery 90% or so.The embodiment shows that the material has efficiently concentrating tonalid and a huge sum of money
Category and the function of photocatalytic degradation tonalid;The composite material can realize material recovery by temperature control simultaneously.