CN106512950A - Preparation method of surfactant-modified zeolite adsorbent - Google Patents
Preparation method of surfactant-modified zeolite adsorbent Download PDFInfo
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- CN106512950A CN106512950A CN201611024829.0A CN201611024829A CN106512950A CN 106512950 A CN106512950 A CN 106512950A CN 201611024829 A CN201611024829 A CN 201611024829A CN 106512950 A CN106512950 A CN 106512950A
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical class O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000003463 adsorbent Substances 0.000 title claims abstract description 18
- 239000010457 zeolite Substances 0.000 claims abstract description 47
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 26
- 239000004094 surface-active agent Substances 0.000 claims abstract description 23
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 230000004048 modification Effects 0.000 claims abstract description 14
- 238000012986 modification Methods 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 230000007935 neutral effect Effects 0.000 claims abstract description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 5
- 230000018044 dehydration Effects 0.000 claims abstract description 5
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 5
- 238000010992 reflux Methods 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 4
- 229960001927 cetylpyridinium chloride Drugs 0.000 claims description 4
- YMKDRGPMQRFJGP-UHFFFAOYSA-M cetylpyridinium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+]1=CC=CC=C1 YMKDRGPMQRFJGP-UHFFFAOYSA-M 0.000 claims description 4
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 230000003213 activating effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 13
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 9
- 229910001430 chromium ion Inorganic materials 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000005406 washing Methods 0.000 abstract 2
- 238000009833 condensation Methods 0.000 abstract 1
- 230000005494 condensation Effects 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 7
- 239000011651 chromium Substances 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 6
- 238000011160 research Methods 0.000 description 4
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- 238000003760 magnetic stirring Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical group NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 1
- FQVXNJNKUPMUJL-UHFFFAOYSA-N C(C1=CC=CC=C1)Br(C)(C)C Chemical group C(C1=CC=CC=C1)Br(C)(C)C FQVXNJNKUPMUJL-UHFFFAOYSA-N 0.000 description 1
- 241000270666 Testudines Species 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- -1 ion Compound Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 231100000915 pathological change Toxicity 0.000 description 1
- 230000036285 pathological change Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 231100001234 toxic pollutant Toxicity 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
- B01J20/165—Natural alumino-silicates, e.g. zeolites
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a preparation method of a surfactant-modified zeolite adsorbent. The method comprises specific steps as follows: step 1, natural zeolite is ground into powder, the powder is screened with a sieve of 80-200 meshes, and zeolite powder is obtained; step 2, the zeolite powder is added to a strong base solution and is stirred for 1-2 h, a mixture is washed to be neutral, then neutral zeolite powder is placed into a hydrochloric acid solution and is stirred for 1-3 h, then filtration, dehydration and washing are performed until no chloride ions are detected, and a product is dried; step 3, a surfactant is added to pure water, then the zeolite powder is added to the pure water, and a finished product can be obtained through stirring, washing and drying under constant-temperature and reflux condensation conditions by a magnetic stirrer. Raw materials adopted in the method are natural mineral raw materials, the price is low, modification steps are few, the preparation technology is simple, modified zeolite has the very high ability for capturing heavy metal chromium ions, the adsorbing capacity is large, the removal rate is high, the speed is high, the adsorbing efficiency is improved, and the use effect is good.
Description
Technical field
The present invention relates to water pollution process field, specifically a kind of preparation side of surface active agent modification zeolites adsorbent
Method.
Background technology
As Chinese Urbanization and industrialization development are accelerated, water pollution also becomes increasingly serious.Some factory and enterprises are transported
Waste water produced by row often contains substantial amounts of toxic pollutant, and wherein chromium ion is then a kind of very big pollution of hazardness
Thing.Chromate waste water not up to standard can cause many pathological changes reactions of plant, biological and human body in being discharged into water body, and concentration is high
Shi Ze has fatal harm.Therefore, to the removal of chromium ion in water body into environmentalist study hotspot, and wherein by
It is higher compared with trivalent chromium toxicity in Cr VI, therefore even more paid close attention to by popular and scientific research personnel.For chromic removal, when
In front practical application to adopt chemical precipitation method and membrane separation process etc., these methods need expensive cost and running cost more.Just
Therefore, adsorption treatment is carried out to which using cheap natural adsorbent then becomes a potential research direction.And often day
When right adsorbent is unprocessed, its absorbability is general, and using value is little, therefore research focuses mostly in using suitable side
Method natural adsorbent is modified after adsorbing hexavalent chromium again.Existing many researchs both at home and abroad show that natural zeolite is through appropriate
It is organically-modified, its absorption property to organic pollution is very good, it might even be possible to match in excellence or beauty with activated carbon.And China is natural
Zeolite mineral resources very abundant, gross reserves are at the forefront in the world.Using chromium ion in modified natural zeolite treatment water, and other
Anionic pollutant, will become a kind of potential method of tool.
The content of the invention
It is an object of the invention to provide a kind of preparation method of surface active agent modification zeolites adsorbent, above-mentioned to solve
The problem proposed in background technology.
For achieving the above object, the present invention provides following technical scheme:
A kind of preparation method of surface active agent modification zeolites adsorbent, comprises the following steps that:
Step one, natural zeolite is pulverized, and 80-200 mesh sieves excessively obtain zeolite powder;
Step 2, by zeolite powder add 0.5-1 times 2mol/L strong base solution in, stirring 1-2h, then spend from
Sub- water is cleaned to neutrality, then neutral zeolite powder is put in the hydrochloric acid solution of 0.5-1 times of 2mol/L, stirs 1-3h, afterwards
Filtering means dehydration is cleaned to detecting without chloride ion, and is dried at 35-40 DEG C;
Step 3, adds surfactant in pure water, the zeolite powder that then addition step 2 is obtained in pure water, uses
Magnetic stirring apparatuss stir 3-5h under the conditions of 60 DEG C of constant temperature and condensing reflux, filter afterwards and clean for several times, dry at 25-40 DEG C
It is dry, you can to obtain finished product.
As further scheme of the invention:Surfactant adopts cetylpyridinium chloride or cetyl trimethyl
Amine bromide, highly basic adopt sodium hydroxide or potassium hydroxide.
As further scheme of the invention:The whipping temp of hydrochloric acid solution and strong base solution is 30-50 DEG C, and surface is lived
Property agent and zeolite powder weight ratio be 0.2-0.5:1.
Compared with prior art, the invention has the beneficial effects as follows:The raw material that the present invention is adopted is all from natural mineral raw,
Low price, modification procedure are few, preparation process is simple, and modified zeolite is extremely strong for the capturing ability of heavy metal chromium ion,
Adsorption capacity is big, removal efficiency is high, speed is fast, improves adsorption efficiency, and using effect is good.
Description of the drawings
Fig. 1 is the infrared light before and after the modified zeolite absorption of the preparation method preparation of surface active agent modification zeolites adsorbent
Spectrogram.
Fig. 2 is the SEM figures before the modified zeolite absorption of the preparation method preparation of surface active agent modification zeolites adsorbent.
Fig. 3 is the SEM figures after the modified zeolite absorption of the preparation method preparation of surface active agent modification zeolites adsorbent.
Fig. 4 is the XRD figure before and after the modified zeolite absorption of the preparation method preparation of surface active agent modification zeolites adsorbent.
Specific embodiment
The technical scheme of this patent is described in more detail with reference to specific embodiment.
Embodiment 1
A kind of preparation method of surface active agent modification zeolites adsorbent, comprises the following steps that:
Step one, natural zeolite is pulverized, and 120 mesh sieves excessively obtain zeolite powder;
Step 2, during zeolite powder to be added 0.6 times of the sodium hydroxide solution of 2mol/L, stirs 1h, so at 35 DEG C
Deionized water is cleaned to neutrality afterwards, then neutral zeolite powder is put in the hydrochloric acid solution of 1 times of 2mol/L, is stirred at 40 DEG C
2h, afterwards filtering means dehydration clean to detecting without chloride ion, and dry at 35 DEG C;
Step 3, adds cetylpyridinium chloride in pure water, the zeolite that then addition step 2 is obtained in pure water
The weight ratio of powder, surfactant and zeolite powder is 0.2:1, with magnetic stirring apparatuss in 60 DEG C of constant temperature and condensing reflux bar
3h is stirred under part, is filtered afterwards and is cleaned for several times, dry at 28 DEG C, you can obtain finished product.
Embodiment 2
Step one, natural zeolite is pulverized, and 160 mesh sieves excessively obtain zeolite powder;
Step 2, during zeolite powder to be added 0.8 times of the sodium hydroxide solution of 2mol/L, stirs 2h, so at 38 DEG C
Deionized water is cleaned to neutrality afterwards, then neutral zeolite powder is put in the hydrochloric acid solution of 0.5 times of 2mol/L, is stirred at 40 DEG C
2h is mixed, filtering means dehydration is cleaned to detecting without chloride ion afterwards, and dried at 35 DEG C;
Step 3, adds CTAB in pure water, then adds what step 2 was obtained in pure water
The weight ratio of zeolite powder, surfactant and zeolite powder is 0.5:1, with magnetic stirring apparatuss are in 60 DEG C of constant temperature and condense back
3h is stirred under the conditions of stream, is filtered afterwards and is cleaned for several times, dry at 30 DEG C, you can obtain finished product.
Comparative example
Surfactant is replaced with trimethylamine by comparative example 1, and surfactant is replaced with benzyl trimethyl bromine by comparative example 2
Change ammonium, surfactant is replaced with hexamethylene diamine by comparative example 3, and remaining step and component are with embodiment 1.
Comparative example 4 is processed only with strong base solution in step 2, and comparative example 5 is molten only with hydrochloric acid in step 2
Liquid is processed, and comparative example 6 is first processed using hydrochloric acid solution in step 2 and wash clean is to neutrality, then using strong base solution
Processed, remaining step and component are with embodiment 2.
By the product of embodiment 1-2 of 0.5g, comparative example 1-6 and natural zeolite respectively with 25mL, the sexavalence of 50mg/L
Cr solution mixes, and adjusts stirring reaction 1h to 6 room temperatures of pH, filters, and determines Cr (VI) adsorbance of modified zeolite, is tied
Fruit sees Tables 1 and 2.
Table 1
Table 1 can be seen that using first strong base solution process and wash clean is to neutrality, then is processed using hydrochloric acid solution
Method prepare modified zeolite for the sewage containing heavy metal chromium ion process, for the heavy metal chromium in absorption effluent
Ion effect is good.
Table 2
Table 2 it can be seen that using cetylpyridinium chloride and CTAB as surfactant,
It is good for the heavy metal chromium ion effect in absorption effluent.
The modified zeolite prepared in embodiment 1 and embodiment 2, with more amino, can form huge legendary turtle with heavy metal ion
Compound, strong for the capturing ability of heavy metal, adsorption capacity is big, removal efficiency is high, speed is fast, add it is zeolite structured in duct it is rich
Richness, specific surface area are big, therefore for heavy metal ion has preferable adsorption, are applied at the sexavalence Cr ion of sewage
Reason, simple to operate, with low cost, heavy-metal residual rate is low., compared with the zeolite of unmodified process, absorbability is more for the adsorbent
By force, adsorption capacity is bigger.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of spirit or essential attributes without departing substantially from the present invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as and limit involved claim.
Moreover, it will be appreciated that although this specification is been described by according to embodiment, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of description is only that those skilled in the art should for clarity
Using description as an entirety, the technical scheme in each embodiment can also Jing it is appropriately combined, form those skilled in the art
Understandable other embodiment.
Claims (3)
1. a kind of preparation method of surface active agent modification zeolites adsorbent, it is characterised in that comprise the following steps that:
Step one, natural zeolite is pulverized, and 80-200 mesh sieves excessively obtain zeolite powder;
Step 2, during zeolite powder to be added 0.5-1 times of the strong base solution of 2mol/L, stirs 1-2h, then deionized water
Clean to neutrality, then in the hydrochloric acid solution of the 2mol/L that neutral zeolite powder is put into 0.5-1 times, stir 1-3h, filter afterwards
Dehydration is cleaned to detecting without chloride ion, and is dried at 35-40 DEG C;
Step 3, adds surfactant in pure water, the zeolite powder that then addition step 2 is obtained in pure water, uses magnetic force
Agitator stirs 3-5h under the conditions of 60 DEG C of constant temperature and condensing reflux, filters afterwards and cleans for several times, dries, i.e., at 25-40 DEG C
Finished product is obtained.
2. the preparation method of surface active agent modification zeolites adsorbent according to claim 1, it is characterised in that the table
Face activating agent adopts cetylpyridinium chloride or CTAB, highly basic to adopt sodium hydroxide or hydroxide
Potassium.
3. the preparation method of surface active agent modification zeolites adsorbent according to claim 1 and 2, it is characterised in that institute
The whipping temp for stating hydrochloric acid solution and strong base solution is 30-50 DEG C, and the weight ratio of surfactant and zeolite powder is
0.2-0.5:1。
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Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
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CN107265544A (en) * | 2017-06-12 | 2017-10-20 | 防城港市渔业技术推广站 | A kind of fishery cultivating treatment tank |
CN107265756A (en) * | 2017-06-12 | 2017-10-20 | 防城港市渔业技术推广站 | A kind of fishery cultivating sewage water treatment method |
CN108464302A (en) * | 2018-04-28 | 2018-08-31 | 张志� | A kind of slow-release chlorine dioxide of solid carrier Zeolite support and preparation method thereof |
CN109012589A (en) * | 2018-08-23 | 2018-12-18 | 中山大学 | A kind of urea-modified charcoal of selective absorption Cr (VI) and its preparation method and application method |
CN109046297A (en) * | 2018-07-26 | 2018-12-21 | 江苏开放大学(江苏城市职业学院) | A kind of preparation method and applications of modified coal ash sodium base zeolite |
CN109200995A (en) * | 2018-09-03 | 2019-01-15 | 中成未来新材料(福建)有限公司 | A kind of preparation process of environmental-protection adsorption material |
CN109351337A (en) * | 2018-12-18 | 2019-02-19 | 东北大学 | A kind of preparation method and applications of silane coupler modified zeolite |
CN109368872A (en) * | 2018-12-03 | 2019-02-22 | 赛恩斯环保股份有限公司 | A kind of method of Tungsten smelting Sewage advanced treatment |
CN109970133A (en) * | 2019-01-24 | 2019-07-05 | 玉溪师范学院 | The porous ecological assemblage device and its technique of sewage plant level-one A Tailwater Depth processing |
CN110193355A (en) * | 2019-06-27 | 2019-09-03 | 清华大学 | The method that the porous material of pollution of chromium in water removal is removed in the modified Chinese parasol leaf production of CTAB |
CN112028164A (en) * | 2020-08-25 | 2020-12-04 | 广西桂林新大桂工环境科技中心(有限合伙) | Preparation method of zeolite liquid for sewage treatment |
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CN115584167A (en) * | 2022-10-20 | 2023-01-10 | 李其洁 | Antibacterial interior wall coating and preparation method thereof |
CN117256487A (en) * | 2023-09-11 | 2023-12-22 | 山东辛化硅胶有限公司 | Easily-treated water-soluble cat litter and preparation method thereof |
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CN107265756A (en) * | 2017-06-12 | 2017-10-20 | 防城港市渔业技术推广站 | A kind of fishery cultivating sewage water treatment method |
CN107265544A (en) * | 2017-06-12 | 2017-10-20 | 防城港市渔业技术推广站 | A kind of fishery cultivating treatment tank |
CN108464302A (en) * | 2018-04-28 | 2018-08-31 | 张志� | A kind of slow-release chlorine dioxide of solid carrier Zeolite support and preparation method thereof |
CN109046297A (en) * | 2018-07-26 | 2018-12-21 | 江苏开放大学(江苏城市职业学院) | A kind of preparation method and applications of modified coal ash sodium base zeolite |
CN109012589B (en) * | 2018-08-23 | 2019-07-02 | 中山大学 | A kind of urea-modified charcoal of selective absorption Cr (VI) and its preparation method and application method |
CN109012589A (en) * | 2018-08-23 | 2018-12-18 | 中山大学 | A kind of urea-modified charcoal of selective absorption Cr (VI) and its preparation method and application method |
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