CN105413691A - Catalyst for organic wastewater treatment and preparation method thereof - Google Patents
Catalyst for organic wastewater treatment and preparation method thereof Download PDFInfo
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- CN105413691A CN105413691A CN201510700382.3A CN201510700382A CN105413691A CN 105413691 A CN105413691 A CN 105413691A CN 201510700382 A CN201510700382 A CN 201510700382A CN 105413691 A CN105413691 A CN 105413691A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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Abstract
The invention discloses a catalyst for organic wastewater treatment and a preparation method thereof. The catalyst is prepared by coating a cobalt-doped composite material layer on a granular silicon-containing carrier. The thickness of the cobalt-doped composite material layer is 100-240 nm. The cobalt-doped composite material layer takes a silicon oxide-titanium oxide composite layer as a base body and cobalt as an enhancer. The molar ratio of the enhancer to the base body in the cobalt-doped composite material layer is 1: (50-200). The molar ratio of silicon oxide to titanium oxide in the silicon oxide-titanium oxide composite layer is 1: (1-3). The catalyst is good in catalytic effect and long in service life.
Description
Technical field
The present invention relates to a kind of Catalysts and its preparation method for treatment of Organic Wastewater, belong to sewage treatment area.
Background technology
Persulfate advanced oxidation is a kind of effective ways processing organic wastewater with difficult degradation thereby grown up in recent years, and its oxidation mechanism is under catalyst action, produces the SO higher than OH oxidizing potential
4 -, main catalytic way has thermocatalytic, photocatalysis and chemical catalysis.Chemical catalysis mainly with metal or transition metal ions as Fe
0, Fe
2+, Co
2+, Ce
2+deng activation SO
4 -.Zhang Shenghan etc. are in the patent of invention of " ferrous sulfate/potassium peroxydisulfate system advanced treatment of dyeing wastewater " (Donghua University journal Vol.39N6.P814), Wan little Jiao etc. " the persulfate treating technology rubbish percolation liquid membrane concentrate " people such as (non-ferrous metal design and research Vol.35No.1P33) and Zhang Naidong: 201110149719.8 progress describing chemical catalytic oxidation.Shen Xunwei etc. are at " impact of persulphate on photocatalysis of phenol in aqueous TiO_2 suspensions " (ACTA Scientiae Circumstantiae Vol.25No.5P631), the outstanding slurry of titanium dioxide is uniformly dispersed in system, is conducive to the carrying out of catalytic reaction, but system first can be made muddy, be unfavorable for the transmission of light, after its secondary response is complete, there is being separated of titanium dioxide and waste water, titanium dioxide powder granularity is very thin, separation difficulty, in addition, titanium dioxide reclaims difficulty, causes cost increase.Sha Junpeng etc. are at " nano-TiO
2/ mesoporous ZSM-5 works in coordination with persulfate photocatalytic degradation nitrophenol wastewater " (Anhui University of Technology journal Vol.30No.1P32) describe the progress of persulfate cooperative photocatalysis oxidation aspect, titanium dioxide is coated on carrier by article, solve the problem existing for suspended state, but also just in photocatalysis, solve problem, the present invention passes through transition metal ions cobalt to titania additive, titanium dioxide lattice is made to produce defect, improve the photocatalysis effect of titanium dioxide, cobalt ions directly can activate potassium peroxydisulfate and produce SO simultaneously
4 -, improve the oxidation activity of potassium peroxydisulfate.
From above-mentioned introduction, transition metal-catalyzed, be directly excite SO by the variation of valence of transition metal
4 -generation, Titanium Dioxide is then produce conduction band electron and valence band hole by optical excitation titanium dioxide, and photohole moves to surface and reacts with ADSORPTION STATE hydroxyl and water and generate hydroxyl radical free radical; And light induced electron and electron acceptor produce O
- 2free radical, and then excite persulfate to produce SO
4 -.The effect of catalyst in the process of persulfate oxidation is vital.
Data shows, and when metal and metal ion catalysis persulfate oxidation, metal ion is dissolved in pending waste liquid with ionic state, not only causes the loss of metal ion, and needs the separation circuit increasing metal ion and waste water.If metal ion is loaded on solid carrier, just can solve the problem.When carrying out optically catalytic TiO 2 reaction, someone by titanium dichloride load on carrier, 20111092779.8), patent of invention " MCM-41 molecular sieve and titanium nanometer composite material and preparation method thereof the " (patent No.: 200410096181.9) of the people such as Zhai Qingzhou as patent of invention " a kind of modification processing method of the ZSM-5 zeolite " (patent No.: of: people such as Fan Feng.
Summary of the invention
The technical problem that the present invention solves is, provide a kind of for the catalyst for the treatment of of Organic Wastewater and the preparation method of this catalyst, this catalyst can be degraded to organic wastewater in conjunction with catalytic oxidation and photocatalysis.
Technical scheme of the present invention is, a kind of catalyst for treatment of Organic Wastewater is provided, described catalyst mixes cobalt composite material layer granular containing coated on silicon carrier, the described thickness mixing cobalt composite material layer is 100 ~ 240nm, describedly to mix in cobalt composite material layer with silica-titania compound for matrix, cobalt is reinforcement, described mol ratio of mixing reinforcement and matrix in cobalt composite material layer is 1 ︰ 50 ~ 200, and in described silica-titania compound, the mol ratio of silica and titanium oxide is 1 ︰ 1 ~ 3.
Further, the particle diameter of described carrier is 1 ~ 5mm.
Further, described is mesoporous material containing silicon carrier.
Further, the density of described carrier is 1.1 ~ 1.5g/cm
3.
Further, described carrier and mix the intermediate layer being also coated with silica-titania compound between cobalt composite material layer and forming, the thickness in described intermediate layer is 70 ~ 200nm.
Another technical scheme provided by the invention is, provides a kind of preparation method of the catalyst for treatment of Organic Wastewater further, comprises the following steps:
(1) soluble cobalt is water-soluble, be mixed with the cobalt salt solution that concentration of cobalt ions is 0.1 ~ 1M, then be acidified with acid to pH be 4.5 ~ 6.5;
(2) by volume part, adds the absolute ethyl alcohol of 5 ~ 20 parts, obtains ethanol cobalt liquor in the solution that 1 part of step (1) obtains;
(3) by volume part, adds 3 ~ 5 parts of acetylacetone,2,4-pentanediones, then adds 15 ~ 30 parts of butyl titanates and 4 ~ 10 parts of silester in 100 parts of absolute ethyl alcohols, after stirring, add 15 ~ 20 parts of described ethanol cobalt liquors again, more than stirring reaction 0.5h, react rear placement ageing 1 ~ 2h;
(4) granular carrier is added in the solution that step (3) obtains, soak 0.1 ~ 2h and also stir, after Separation of Solid and Liquid, solid is dried, then calcine at 500 ~ 700 DEG C, obtain described catalyst.
Further, the Surface coating silica-titanium oxide compound of the carrier added in described step (4), the method for coating of silica-titania compound comprises the following steps:
(1) by volume part, 3 ~ 5 parts of acetylacetone,2,4-pentanediones are added in 100 parts of absolute ethyl alcohols, 4 ~ 6 parts of glacial acetic acid, add 15 ~ 30 parts of butyl titanates and 4 ~ 10 parts of silester again, after stirring, adding 15 ~ 20 parts of volume fractions is again the ethanolic solution of 85 ~ 95%, and more than stirring reaction 0.5h has reacted rear placement ageing 1 ~ 2h;
(2) granular carrier is added in the solution that step (1) obtains, soak 0.1 ~ 2h and also stir, after Separation of Solid and Liquid, solid is dried, then calcine at 500 ~ 700 DEG C, obtain the carrier of Surface coating silica-titanium oxide compound.
Further, described carrier is zeolite after pretreatment, and described pretreated step is: zeolite is calcined 1 ~ 2h at 750 ~ 950 DEG C, then washing removing soluble-salt, dries.
Further, in described step (4), the temperature of oven dry is 100 ~ 200 DEG C.
Further, the time of described calcining is 1 ~ 3h.
Cobalt, silica and titanium dioxide load to containing on silicon carrier by the present invention simultaneously, the on the one hand wide bandgap semiconductor of titanium dioxide to be a kind of band gap width be 3.2eV, the higher quantum efficiency that makes of the recombination rate of its photohole-duplet reduces, undesirable to the utilization ratio of solar energy.In order to improve the photocatalytic activity of titanium dioxide, need to carry out modification to it, to improve photocatalysis quantum yield.Current many research shows to adopt semiconductors coupling.The method such as noble metal loading and ion doping can be widened spectral response range preferably and improve photo-quantum efficiency.On the other hand, cobalt ions can excite persulfate to produce the potentiometric titrations (SO of strong oxidizing property
4 -).So cobalt doped titanium dioxide can play the double effect improving photocatalysis efficiency and activate persulfate.
Cobalt salt and TiO 2 precursor react and generate Co-TiO
2presoma, cobalt is uniformly dispersed.The wherein mol ratio m of cobalt oxide and titanium dioxide
co: m
ti=1 ︰ 50 ~ 200.
TiO 2 precursor is after 500 ~ 700 DEG C of calcinings, form anatase titanium dioxide, the titanium dioxide of this structure produces photohole and light induced electron under the irradiation can seeing ultraviolet light, and light induced electron is combined with organic matter and radical reaction occurs, and realizes organic degraded.Due to the integrality of its lattice structure, the photohole produced and light induced electron can be buried in oblivion in moment compound, and the electron amount that really can be combined with organic matter is little, so reaction efficiency is very low.After cobalt mixes, divalence cobalt occupies titanic position, and titanium dioxide lattice is deformed, and the photohole produced and the compound of light induced electron become difficulty, and bury in oblivion speed and reduce, opposing electronic quantity increases, and increases organic degradation efficiency.
Select artificial zeolite cheap and easy to get for carrier, the cost of catalyst and manufacture difficulty can be made significantly to reduce.The monomer size of the catalyst made and medium density, can form fluidisation state very easily, not easily run off again.Silicon in silica with containing being more easily combined between silicon carrier, make containing silicon carrier higher with the clad bond strength outside carrier, thus cobalt is difficult to depart from carrier, prolongation service time.
The invention has the beneficial effects as follows, by cobalt and titanium dioxide, silica compound coating at granular carrier surface, catalysis area is increased, simultaneously transition metal ions excites the photochemical catalytic oxidation acting in conjunction of the catalytic oxidation of persulfate and titanium dioxide in organic wastewater with difficult degradation thereby, these two kinds effect superpositions effectively can improve wastewater treatment efficiency, silica can strengthen the bonding strength containing silicon carrier and clad simultaneously, and the durability of catalyst material is improved widely.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
The present embodiment provides a kind of for the catalyst for the treatment of of Organic Wastewater and the preparation method of this catalyst.This catalyst is take average grain diameter as the zeolite of 3mm is carrier, cobalt composite material layer is mixed at coated one deck about the 150nm of zeolite surface, it is described that to mix cobalt in cobalt composite material layer be reinforcement, matrix is silica-titania composite bed, and cobalt is about 1 ︰ 70 with the mol ratio of (titanium dioxide+silica); The density of this catalyst is 1.13g/cm
3.
The preparation method of this catalyst is as follows:
A. 1000g zeolite is placed in calcining furnace 900 DEG C calcining 1.5 hours, after cooling, falls soluble-salt with water logging eccysis, in 200 DEG C of dry for standby.
B. by the cobalt salt solution be mixed with containing cobalt 0.1M soluble in water for cobalt acetate, add glacial acetic acid and be acidified to pH and be about 5.5, prevent cobalt ions from precipitating.
C. get 10mL and add 90mL absolute ethyl alcohol, be mixed with ethanol cobalt liquor for subsequent use.
D. in reactor, add 200mL absolute ethyl alcohol, add 4mL acetylacetone,2,4-pentanedione, add 24mL butyl titanate and 6ml silester after stirring evenly, stir.Separately get the ethanol cobalt liquor that 15mL step c obtains, slowly drip in reactor, add rear continuation stirring reaction 1 hour, place ageing 2 hours.
E. added by the zeolite in step a in reactor and soak 1 hour, middle stirring for several times, will be coated with Co-TiO after being filtered dry
2the zeolite of presoma is 180 DEG C of oven dry; In 600 DEG C of calcinings 2 hours, complete coated, obtain coated Co-(SiO
2-TiO
2) catalyst.When thickness can not reach requirement, practicable repeatedly coated, method is the same.
Embodiment 2
The present embodiment provides a kind of for the catalyst for the treatment of of Organic Wastewater and the preparation method of this catalyst.This catalyst is take average grain diameter as the zeolite of 3mm is carrier, at the silica-titania layer of first coated one deck about the 100nm of zeolite surface, again coated one deck about 150nm mix cobalt composite material layer, it is described that to mix cobalt in cobalt composite material layer be reinforcement (discontinuous phase), matrix (continuous phase) is silica-titania composite bed, and cobalt is about 1 ︰ 150 with the mol ratio of (titanium dioxide+silica); The density of this catalyst is 1.2g/cm
3.
The preparation method of this catalyst is as follows:
A. 1000g zeolite is placed in calcining furnace 900 DEG C calcining 2 hours, after cooling, falls soluble-salt with water logging eccysis, in 200 DEG C of dry for standby.
B. in reactor, add 200mL absolute ethyl alcohol, add 3.5mL acetylacetone,2,4-pentanedione, 6mL glacial acetic acid, add after stirring evenly after stirring evenly and add 24mL butyl titanate and 8ml silester, stir.Separately get the ethanol of 15mL volume fraction 90%, slowly drip in reactor, add rear continuation stirring reaction 1 hour, place ageing 1 hour.
C. added by zeolite ready in step b in reactor and soak 1.5 hours, middle stirring for several times, will be coated with TiO after being filtered dry
2the zeolite of presoma is 200 DEG C of oven dry; In 550 DEG C of calcinings 2 hours, complete first time coated (SiO
2-TiO
2coated).
D. by the cobalt salt solution be mixed with containing cobalt 1M soluble in water for cobalt acetate, add glacial acetic acid and be acidified to pH and be about 5.0, prevent cobalt ions from precipitating.
E. get 10mL and add 90mL absolute ethyl alcohol, be mixed with ethanol cobalt liquor for subsequent use.
F. in reactor, add 200mL absolute ethyl alcohol, add 3.5mL acetylacetone,2,4-pentanedione, add 24mL butyl titanate and 8ml silester after stirring evenly, stir; Separately get the ethanol cobalt liquor that 15mL step e obtains, slowly drip in reactor, add rear continuation stirring reaction 1 hour, place ageing 1 hour.
G. add in reactor soak completing first time coated zeolite in step c 0.5 hour, middle to stir for several times, after being filtered dry, will Co-TiO be coated with
2the zeolite of presoma is 200 DEG C of oven dry; In 550 DEG C of calcinings 2 hours, complete the coated { Co-(SiO of second time
2-TiO
2) coated, obtain coated Si O
2-TiO
2/ Co-(SiO
2-TiO
2) catalyst.
Embodiment 3
In order to verify the catalytic effect of the catalyst obtained by embodiment 1 and embodiment 2, carried out catalytic effect experiment and comparison, specific experiment is as follows:
Organic wastewater with difficult degradation thereby water sample takes from certain petroleum chemical enterprise, and COD (COD)=1050mg/L, BOD (BOD)/COD=0.12, fluorescent staining toxicity test is 72%.
Test method: get a certain amount of waste water, inserts 18w uviol lamp under water, adds the potassium peroxydisulfate of total Water 0.5%, from bottom aeration, make catalyst be in fluidisation state.Respectively to adding following catalyst in waste water: 1. titania powder; 2. the cobalt nitrate solution of cobalt ions content 0.1%; 3. the zeolite of cladding titanium dioxide; 4. the zeolite of the titanium dioxide coating of the cobalt nitrate solution+5% of cobalt content 0.1%; 5. the coated Co-(SiO of embodiment 1 preparation
2-TiO
2) catalyst; 6. the coated Si O of embodiment 2 preparation
2-TiO
2/ Co-(SiO
2-TiO
2) catalyst.React under room temperature, test each reaction 1 hour for six, sampling detects.Result is as following table:
The catalytic effect of the various organic wastewater catalyst of table 1
Wherein, the consumption (%) of the catalyst percentage accounting for the gross mass of waste water+catalyst that is catalyst; Titania powder due to specific area large, cobalt nitrate solution is owing to being liquid, large with the contact area of reactant, so addition is relatively less.The 4. to plant the catalytic effect of catalyst also good, but need add cobalt nitrate at every turn, and cost is high, also easily causes the pollution of cobalt ions.
In order to verify the service life of catalyst, also carried out endurancing, the catalyst obtained by embodiment 2 has carried out 10 parallel tests continuously, each 1 hour.Experiment terminates sample analysis, and 10 result no significant differences, in table 2.
The continuous degradation effect used for 10 times of table 2 catalyst
| Access times | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| COD(mg/L) | 409 | 409 | 409 | 410 | 411 | 412 | 412 | 413 | 414 | 415 |
Claims (10)
1. the catalyst for treatment of Organic Wastewater, it is characterized in that, described catalyst mixes cobalt composite material layer granular containing coated on silicon carrier, the described thickness mixing cobalt composite material layer is 100 ~ 240nm, describedly to mix in cobalt composite material layer with silica-titania compound for matrix, cobalt is reinforcement, described mol ratio of mixing reinforcement and matrix in cobalt composite material layer is 1 ︰ 50 ~ 200, and in described silica-titania compound, the mol ratio of silica and titanium oxide is 1 ︰ 1 ~ 3.
2. catalyst as claimed in claim 1, it is characterized in that, the particle diameter of described carrier is 1 ~ 5mm.
3. catalyst as claimed in claim 1, is characterized in that, described is mesoporous material containing silicon carrier.
4. catalyst as claimed in claim 1, it is characterized in that, the density of described carrier is 1.1 ~ 1.5g/cm
3.
5. catalyst as claimed in claim 1, is characterized in that, described carrier and mix the intermediate layer being also coated with silica-titania compound between cobalt composite material layer and forming, and the thickness in described intermediate layer is 70 ~ 200nm.
6. as described in one of claim 1-5 for a preparation method for the catalyst for the treatment of of Organic Wastewater, it is characterized in that, comprise the following steps:
(1) soluble cobalt is water-soluble, be mixed with the cobalt salt solution that concentration of cobalt ions is 0.1 ~ 1M, then be acidified with acid to pH be 4.5 ~ 6.5;
(2) by volume part, adds the absolute ethyl alcohol of 5 ~ 20 parts, obtains ethanol cobalt liquor in the solution that 1 part of step (1) obtains;
(3) by volume part, adds 3 ~ 5 parts of acetylacetone,2,4-pentanediones, then adds 15 ~ 30 parts of butyl titanates and 4 ~ 10 parts of silester in 100 parts of absolute ethyl alcohols, after stirring, add 15 ~ 20 parts of described ethanol cobalt liquors again, more than stirring reaction 0.5h, react rear placement ageing 1 ~ 2h;
(4) granular carrier is added in the solution that step (3) obtains, soak 0.1 ~ 2h and also stir, after Separation of Solid and Liquid, solid is dried, then calcine at 500 ~ 700 DEG C, obtain described catalyst.
7. preparation method as claimed in claim 6, it is characterized in that, the Surface coating silica-titanium oxide compound of the carrier added in described step (4), the method for coating of silica-titania compound comprises the following steps:
(1) by volume part, 3 ~ 5 parts of acetylacetone,2,4-pentanediones are added in 100 parts of absolute ethyl alcohols, 4 ~ 6 parts of glacial acetic acid, add 15 ~ 30 parts of butyl titanates and 4 ~ 10 parts of silester again, after stirring, adding 15 ~ 20 parts of volume fractions is again the ethanolic solution of 85 ~ 95%, and more than stirring reaction 0.5h has reacted rear placement ageing 1 ~ 2h;
(2) granular carrier is added in the solution that step (1) obtains, soak 0.1 ~ 2h and also stir, after Separation of Solid and Liquid, solid is dried, then calcine at 500 ~ 700 DEG C, obtain the carrier of Surface coating silica-titanium oxide compound.
8. preparation method as claimed in claims 6 or 7, it is characterized in that, described carrier is zeolite after pretreatment, and described pretreated step is: zeolite is calcined 1 ~ 2h at 750 ~ 950 DEG C, then washing removing soluble-salt, dries.
9. preparation method as claimed in claim 6, it is characterized in that, in described step (4), the temperature of oven dry is 100 ~ 200 DEG C.
10. preparation method as claimed in claim 6, it is characterized in that, the time of described calcining is 1 ~ 3h.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109675566A (en) * | 2019-01-30 | 2019-04-26 | 兰州城市学院 | A kind of order mesoporous catalyst of Co-Ti bimetallic and its preparation method and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521218A (en) * | 2013-10-29 | 2014-01-22 | 中国海洋石油总公司 | Preparation method for photocatalyst used for treating volatile organic compounds |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521218A (en) * | 2013-10-29 | 2014-01-22 | 中国海洋石油总公司 | Preparation method for photocatalyst used for treating volatile organic compounds |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109675566A (en) * | 2019-01-30 | 2019-04-26 | 兰州城市学院 | A kind of order mesoporous catalyst of Co-Ti bimetallic and its preparation method and application |
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