WO2004089525A2 - Composites of zinc phthalocyanine and titanium oxide, for use in photocatalytical processes, and method for their obtention - Google Patents
Composites of zinc phthalocyanine and titanium oxide, for use in photocatalytical processes, and method for their obtention Download PDFInfo
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- WO2004089525A2 WO2004089525A2 PCT/BR2004/000052 BR2004000052W WO2004089525A2 WO 2004089525 A2 WO2004089525 A2 WO 2004089525A2 BR 2004000052 W BR2004000052 W BR 2004000052W WO 2004089525 A2 WO2004089525 A2 WO 2004089525A2
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- WIPO (PCT)
- Prior art keywords
- composites
- photocatalytical
- titanium oxide
- processes
- obtention
- Prior art date
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- 239000002131 composite material Substances 0.000 title claims abstract description 52
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000008569 process Effects 0.000 title claims abstract description 26
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 title claims abstract description 26
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims description 18
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 title claims description 18
- 239000011701 zinc Substances 0.000 title claims description 18
- 229910052725 zinc Inorganic materials 0.000 title claims description 18
- 239000003054 catalyst Substances 0.000 claims abstract description 14
- 230000009471 action Effects 0.000 claims abstract description 13
- 238000005202 decontamination Methods 0.000 claims abstract description 7
- 230000003588 decontaminative effect Effects 0.000 claims abstract description 7
- 230000027756 respiratory electron transport chain Effects 0.000 claims abstract description 6
- 230000005284 excitation Effects 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 10
- 230000001699 photocatalysis Effects 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 239000007900 aqueous suspension Substances 0.000 claims description 5
- 238000007146 photocatalysis Methods 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 230000002165 photosensitisation Effects 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 239000002351 wastewater Substances 0.000 claims description 4
- 239000012736 aqueous medium Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims description 3
- 238000001212 derivatisation Methods 0.000 claims description 3
- 238000004090 dissolution Methods 0.000 claims description 3
- 239000012153 distilled water Substances 0.000 claims description 3
- 238000006386 neutralization reaction Methods 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 239000002244 precipitate Substances 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000011343 solid material Substances 0.000 claims description 2
- 239000001117 sulphuric acid Substances 0.000 claims description 2
- 235000011149 sulphuric acid Nutrition 0.000 claims description 2
- 238000006276 transfer reaction Methods 0.000 claims description 2
- 239000008346 aqueous phase Substances 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 230000005855 radiation Effects 0.000 abstract description 17
- 230000007613 environmental effect Effects 0.000 abstract description 8
- 239000011941 photocatalyst Substances 0.000 abstract description 6
- 238000001228 spectrum Methods 0.000 abstract description 5
- 238000004065 wastewater treatment Methods 0.000 abstract description 3
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000975 dye Substances 0.000 description 22
- 239000004065 semiconductor Substances 0.000 description 13
- 230000015556 catabolic process Effects 0.000 description 11
- 238000006731 degradation reaction Methods 0.000 description 11
- 239000004408 titanium dioxide Substances 0.000 description 7
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 4
- 239000000356 contaminant Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229920001732 Lignosulfonate Polymers 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000012634 fragment Substances 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000006862 quantum yield reaction Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003295 industrial effluent Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000000985 reflectance spectrum Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000004117 Lignosulphonate Substances 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229930002875 chlorophyll Natural products 0.000 description 1
- 235000019804 chlorophyll Nutrition 0.000 description 1
- ATNHDLDRLWWWCB-AENOIHSZSA-M chlorophyll a Chemical compound C1([C@@H](C(=O)OC)C(=O)C2=C3C)=C2N2C3=CC(C(CC)=C3C)=[N+]4C3=CC3=C(C=C)C(C)=C5N3[Mg-2]42[N+]2=C1[C@@H](CCC(=O)OC\C=C(/C)CCC[C@H](C)CCC[C@H](C)CCCC(C)C)[C@H](C)C2=C5 ATNHDLDRLWWWCB-AENOIHSZSA-M 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 231100001240 inorganic pollutant Toxicity 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 235000019357 lignosulphonate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001404 mediated effect Effects 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 239000002159 nanocrystal Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003504 photosensitizing agent Substances 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000003019 stabilising effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/88—Handling or mounting catalysts
- B01D53/885—Devices in general for catalytic purification of waste gases
-
- 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
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
-
- 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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
- B01J27/26—Cyanides
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20707—Titanium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/80—Type of catalytic reaction
- B01D2255/802—Photocatalytic
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/19—Catalysts containing parts with different compositions
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/03—Precipitation; Co-precipitation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
- C01P2002/84—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by UV- or VIS- data
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
-
- 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
Definitions
- Chemical catalysts are known by their application to make feasible alternative routes of synthesis, development of new materials, and environmental remediation.
- the present invention consists of composites prepared from a combination of titanium oxide with a photosensitiser dye, capable to mediate electron transfer reactions, potencialising the photocatalyticai action of the titanium oxide.
- AOP Advanced Oxidative Processes
- the AOP are capable to introduce profound changes in the chemical structure of the contaminants, resulting in the destruction or inviabilization of the polluting charge.
- the AOP have potential application in: • pre-treatment of contaminants resistant to biodegradation;
- Semiconductor oxides have been employed as catalysts in photochemical processes aiming the environmental decontamination. These processes can be mediated as by solar radiation as the use of artificial radiation, generally in the ultraviolet region.
- Titanium dioxide and zinc oxide have been pointed as the more attractive compounds for this function, by the low cost, environmentally harmless and easily recoverable. They have been used with success in the elimination of non-biodegradable pollutants in aquatic environments, in the reduction of the pollutant charge of industrial effluents, as in the odour elimination in closed places.
- the photocatalytical technology for water detoxification needs to be viable, of electromagnetic radiation with wavelengths lower than 385 nm.
- the wastewater treatment using photocatalysis and solar radiation under these conditions is limited, however, by the low intensity of the solar radiation in the range between 300 and 385 nm, since that, at the sea level, it corresponds to not more than 5% of the incident solar radiation.
- the electron transfer from a photosensitiser to a semiconductor has been object of intense investigation due to its potential use in photovoltaic cells.
- the solar energy photovoltaic conversion can be considered one of the few sustainable options to provide the demand of electric energy in the future.
- the technique based in the combination of titanium dioxide with organic dyes, was developed in Switzerland, and has been explored in laboratory scale, in several countries.
- the photosensitiser dye absorbs photons from solar light, injecting electrons into the matrix of titanium oxide.
- the system can be compared to the natural model of photosynthesis, in which the photosensitiser dye is the chlorophyll.
- the system consists in a porous structure of titanium oxide nanocrystals, with the dye adsorbed as a monomolecular layer being electronically excited; the dye transfers electrons to the titanium oxide. These electrons diffuse by the matrix, going to the external circuit. Distinction between the invention and the state-of- technique
- the composites objects of this invention are catalysts for photochemical processes that aim environmental decontamination, being also possible to extend their application to photovoltaic cells. It is their characteristic a photocatalytic efficiency higher than the observed for pure titanium oxides.
- the composites, object of the invention, are a combination of TiO 2 and a photosensitiser dye.
- This parameter furnishes an estimate of the efficiency of the photocatalytical process, since that the hydroxy radical can be considered the principal active specie, due to its high reactivity.
- the first produced composites were prepared from dissolution of zinc phthalocyanine in dimethylsulfoxide and posterior addition of titanium dioxide, under stirring and heating. The mixture was maintained under stirring until the partial evaporation of the solvent.
- the mixture photosensitiser dye/titanium oxide is done after previous dissolution of the photosensitiser (zinc phthalocyanine) in concentrated sulphuric acid; after that the necessary amount of titanium oxide (P25) to prepare the composite in one of the in mass compositions (1.0%, 2.5%, 5.0%,
- the mixture rests at 70°C by 24 hours.
- the water is removed, and the precipitate is washed to remove the salts formed during the neutralisation of the remaining acid. Finally, the composite is dried at 80°C.
- the final product is a finely divided bluish powder, insoluble in water, but capable to give sufficiently stable suspensions in this solvent.
- the dye maintains its spectroscopic and photophysical properties, adsorbed to the surface of the semiconductor oxide, and indeed after its remotion, which can be done with the aid of certain organic solvents, as dimethylformamide or dimethylsulfoxide.
- certain organic solvents as dimethylformamide or dimethylsulfoxide.
- the diffuse reflectance spectrum of two of these composites shows that the dye absorbs efficiently radiation with wavelength above 500 nm, where the sun presents elevated spectral irradiance.
- Figure 1 annex, exhibits the diffuse reflectance spectra: (a) anatase; (b) P25; (c) composite with 2.5% m/m of dye; (d) composite with 5.0% m/m of dye.
- the comparison with the anatase or P25 spectra reveals that the composite preserve the spectroscopic characteristics of the photosensitizing dye, favouring the use of radiation with wavelength higher than 500 nm, with the consequent improvement of the photocatalytic activity.
- the surface area of the composites tends to be lower than the verified for P25, used as reference as previously mentioned. As example, we present the following surface areas: P25/ZnPc 10% m/m: 32,40 m 2 /g P25: 50 m /g However, this diminish in the surface area is compensated by the action of the photosensitiser.
- the manner by which the dye is adsorbed to the surface of the semiconductor oxide is fundamental for stabilising of the better efficiency observed for the composite when compared to the pure semiconductor.
- Considering the efficiency profile observed for the composites is very probable that the molecules of zinc phthalocyanine be ordered in an intercalated way on the surface of titanium oxide, do not compromising the usual processes of the photocatalyst.
- the composites are capable to promote an extended degradation of the studied models in the same time interval considered for the two other photocatalysts employed (P25; anatase). This behaviour can be explained by the action of the photosensitiser dye, viabilising the use of other components of the solar spectrum in the activation of the semiconductor oxide.
- Figure 3 attached, illustrates the degradation of lignosulphonate fragments using solar radiation: (a) anatase; (b) P25; (c) composite at 5% m/m.
- a 76 is the absorbance of the photolysed solution at 276 nm.
- the composites can be applied as aqueous suspensions associated to the effluent to be treated, or fixed to the internal surface of the photochemical reactor. In this last application, can be used for the treatment of liquid or gaseous effluents, depending on the geometry of the reactor.
- the treatment of considerable amounts of liquid effluents under the action of solar radiation can be done with the use of CPC (Compound Parabolic Collector) - like reactors, using the catalyst in suspension.
- the aqueous suspensions containing the composite are prepared by addition of a compatible amount to the mixture to be treated. This can be made under vigorous stirring of the suspension, maintained during all photocatalytic process, to warrant a uniform distribution of the catalyst in the medium. Concerning to the fixation of the catalyst over a surface, this can be made by deposition or reaction with the surface (derivatisation). The procedure of deposition, with the formation of a thin film of the composite, preserves its photocatalytical properties. However, this system is more adequate for the treatment of gaseous mixtures, since that for liquid effluents the film tends to shed from surface. For treatment of liquid mixtures, the derivatisation of the composite in the internal surface of the reactor is the alternative.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Toxicology (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Catalysts (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04726392A EP1646443A4 (en) | 2003-04-11 | 2004-04-08 | Composites of zinc phthalocyanine and titanium oxide, for use in photocatalytical processes, and method for their obtention |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0300920-3 | 2003-04-11 | ||
BRPI0300920-3A BR0300920B1 (en) | 2003-04-11 | 2003-04-11 | zinc phthalocyanine and titanium oxide composites, method for obtaining the composites and method of use in photocatalytic processes. |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004089525A2 true WO2004089525A2 (en) | 2004-10-21 |
WO2004089525A3 WO2004089525A3 (en) | 2004-11-18 |
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ID=36091546
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BR2004/000052 WO2004089525A2 (en) | 2003-04-11 | 2004-04-08 | Composites of zinc phthalocyanine and titanium oxide, for use in photocatalytical processes, and method for their obtention |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1646443A4 (en) |
BR (1) | BR0300920B1 (en) |
WO (1) | WO2004089525A2 (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7005401B2 (en) * | 2002-07-09 | 2006-02-28 | Changchun Institute Of Applied Chemistry | Method of preparation of non-platinum composite electrocatalyst for cathode of fuel cell |
DE102004053823A1 (en) * | 2004-11-04 | 2006-05-11 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Volume-doped titanium dioxide composites |
GB2464958A (en) * | 2008-10-31 | 2010-05-05 | Univ Muenster Wilhelms | A method for the manufacture of a photosensitising nano-material |
CN101318749B (en) * | 2007-06-08 | 2011-07-20 | 中国科学院大连化学物理研究所 | Photocatalysis oxidation method for treating waste water of anthraquinone dye |
CN104923306A (en) * | 2015-06-30 | 2015-09-23 | 东华大学 | Magnetron separating photocatalyst used for dye sewage treatment and preparation method for magnetron separating photocatalyst |
US9394186B2 (en) | 2009-11-06 | 2016-07-19 | Universidad Del Valle | Photo-catalysis process applied in eliminating recalcitrant compounds in industrial residual waters |
CN109402652A (en) * | 2018-10-26 | 2019-03-01 | 浙江大学 | Carbon zinc cobalt supports the double photoreduction CO of phthalein zinc cyanide hetero-junctions catalyst2Method |
CN109908899A (en) * | 2019-03-14 | 2019-06-21 | 浙江师范大学 | A kind of TiO2Load the preparation method and applications of monatomic Co catalyst |
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US10987663B2 (en) | 2017-12-22 | 2021-04-27 | Universidad De Chile | Method for preparing laminar zinc hydroxide organic-inorganic nanocomposites for use in the removal and degradation of dyes from textile effluents |
CN116328834A (en) * | 2021-12-24 | 2023-06-27 | 广东工业大学 | Method for degrading PPCPs based on combination of surfactant and chlorophyll |
CN116332356A (en) * | 2021-12-24 | 2023-06-27 | 广东工业大学 | Chlorophyll-based method for degrading PPCPs in water body |
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JPS55115484A (en) * | 1979-02-28 | 1980-09-05 | Asahi Chem Ind Co Ltd | Heterogeneous sensitizer for photosensitized oxidation |
CA1287829C (en) * | 1986-10-02 | 1991-08-20 | Cooper H. Langford | Composite photocatalyst for refractory waste degradation |
US4915804A (en) * | 1988-12-20 | 1990-04-10 | Allied-Signal Inc. | Titanate bound photosensitizer for producing singlet oxygen |
US5120453A (en) * | 1990-12-24 | 1992-06-09 | Uop | Oxidative removal of cyanide from aqueous streams |
CN1260842C (en) * | 2002-07-09 | 2006-06-21 | 中国科学院长春应用化学研究所 | Process for praparing non-Pt composite electrocatalyst for cathode of fuel battery |
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US7005401B2 (en) * | 2002-07-09 | 2006-02-28 | Changchun Institute Of Applied Chemistry | Method of preparation of non-platinum composite electrocatalyst for cathode of fuel cell |
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CN109402652A (en) * | 2018-10-26 | 2019-03-01 | 浙江大学 | Carbon zinc cobalt supports the double photoreduction CO of phthalein zinc cyanide hetero-junctions catalyst2Method |
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CN110721746A (en) * | 2019-10-14 | 2020-01-24 | 长春理工大学 | Magnetic temperature-sensitive nano-microsphere modified by phthalocyanine and synthesis method |
CN116328834A (en) * | 2021-12-24 | 2023-06-27 | 广东工业大学 | Method for degrading PPCPs based on combination of surfactant and chlorophyll |
CN116332356A (en) * | 2021-12-24 | 2023-06-27 | 广东工业大学 | Chlorophyll-based method for degrading PPCPs in water body |
Also Published As
Publication number | Publication date |
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WO2004089525A3 (en) | 2004-11-18 |
EP1646443A4 (en) | 2011-02-23 |
BR0300920A (en) | 2005-05-17 |
EP1646443A2 (en) | 2006-04-19 |
BR0300920B1 (en) | 2012-12-11 |
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