EP2403622A1 - Dispersion précipitable par photocatalyse - Google Patents

Dispersion précipitable par photocatalyse

Info

Publication number
EP2403622A1
EP2403622A1 EP10707205A EP10707205A EP2403622A1 EP 2403622 A1 EP2403622 A1 EP 2403622A1 EP 10707205 A EP10707205 A EP 10707205A EP 10707205 A EP10707205 A EP 10707205A EP 2403622 A1 EP2403622 A1 EP 2403622A1
Authority
EP
European Patent Office
Prior art keywords
dispersion
surfactant
dispersed
photocatalyst
photocatalytically
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10707205A
Other languages
German (de)
English (en)
Inventor
Stephan Peter Bloess
Lothar Elfenthal
Karsten Loehr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kronos International Inc
Original Assignee
Kronos International Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kronos International Inc filed Critical Kronos International Inc
Publication of EP2403622A1 publication Critical patent/EP2403622A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
    • 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
    • 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
    • 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
    • C02F2101/30—Organic compounds
    • C02F2101/301—Detergents, surfactants
    • 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

Definitions

  • the invention is directed to a process for the deposition of surface-active dispersions by means of photocatalysis and to correspondingly composed dispersions.
  • Dispersions are heterogeneous mixtures of at least two different substances: the dispersed substance and the dispersion medium, which are mixed together.
  • surfactant dispersion is meant here a heterogeneous mixture which additionally contains a surfactant.
  • dispersions depending on the state of matter of the substances involved, a distinction is made between suspensions, with solid dispersed matter in liquid dispersion medium, or with emulsions, with liquid dispersed matter in liquid dispersion medium, or with gaseous dispersed matter in liquid dispersion medium.
  • solid dispersion medium solid mixtures - or gaseous dispersant - aerosols - which mix but usually without surfactant auxiliaries.
  • Surfactants are active agents which mediate between different surface properties and thereby support the mixture formation of heterogeneous substances. Basically, a distinction is made in the surface properties between polar - hydrophilic substances and nonpolar - hydrophobic substances.
  • the individual molecules of a surfactant have a polar and a nonpolar end and thus mediate between these different properties by aligning themselves in a molecular intermediate layer. Furthermore, there is a specific surface tension for each substance, with which the molecular binding forces per unit area are recorded.
  • surfactants can mediate between different substances due to a suitable surface tension.
  • surfactants are also referred to as "wetting agents” in the case of suspensions, as “emulsifiers” in the case of emulsions, and as “foaming agents” in foams, as a rule surfactants consist of relatively long-chain carbon-containing molecules Surfactant molecule is differentiated between anionic surfactants (with negatively charged end groups), cationic surfactants (with positively charged end groups), nonionic surfactants (with uncharged end groups), or amphoteric surfactants (with dipolar end groups.) This hydrophilic end group is linked by a chain of hydrocarbons each hydrophobic end group connected.
  • Photocatalysts are semiconductors in which the electromagnetic radiation of the light in the visible or non-visible spectrum leads to an electronically excited state.
  • the excited electrons in turn are the cause of a chemical reaction at the surface of the photocatalyst.
  • the resulting photocatalytic reaction finds use, for example, in photography, in the purification of waste water and air, or in energy conversion by photosynthesis, in photovoltaics or in photolysis.
  • the deposition of dispersions is understood to be a process of substance separation in which separation of the substances involved leads to deposition of the dispersed substances.
  • separations can be caused for example by mechanical force effects.
  • gravity or centrifugal force leads to sedimentation of the dispersed substances.
  • Dispersed material particles are also deposited under mechanical force due to their size, for example by means of sieves, filters or membranes, or due to their mobility, for example by means of fluid beds and classifiers.
  • the force effect of electric or magnetic fields can be used to deposit dispersed substances, for example by electrolysis, magnetic or eddy current divorce.
  • Methods of chemical separation include, for example, precipitation, extraction or distillation whereby either the dispersed or dispersant is removed from the mixture.
  • the deposition of dispersed substances from surface-active dispersions can also be effected by a reaction with the surfactant, in which the surfactant is decomposed or at least loses its mixing function.
  • the surfactant may also be modified or decomposed by an added reactant or by a thermal reaction so that the dispersed Material segregates and separates.
  • care must be taken to ensure that the added substances and reactions do not change the properties of the deposited substances.
  • the aqueous dispersion Teflon PTFE 3OB from DuPont is used to hydrophobicize textile or porous substrates and thus to keep them dry.
  • the substrate is coated with the dispersion and then the dispersed particles are precipitated from the dispersion.
  • this is done by evaporation of the dispersant water at about 120 0 C and subsequent thermal decomposition of the surfactant at about 290 0 C.
  • This significantly limits the use of the dispersion on temperature-sensitive substrates.
  • a better deactivation of the surfactant is needed, which takes place only above 360 0 C. At this temperature, however, already start the dispersed Teflon particles to decompose. Therefore, despite a complex process and temperature control, this deposition is associated with some limitations in terms of hydrophobing.
  • the invention has for its object to provide a method for depositing a dispersed substance from a surfactant dispersion, which overcomes the disadvantages of the prior art.
  • the object is achieved by a method for depositing a dispersed substance from a surfactant dispersion by decomposition of the surfactant, wherein the dispersion contains at least one dispersant, at least one dispersed substance, at least one surfactant and at least one photocatalyst, characterized in that the surfactant by photocatalytic Irradiation with electromagnetic waves or photons is decomposed.
  • the object is further achieved by a photocatalytically depositable dispersion, characterized in that at least one dispersing agent, at least one surfactant, at least one photocatalyst and as dispersed material polyfluoroethylene (PTFE) or latex is contained.
  • a photocatalytically depositable dispersion characterized in that at least one dispersing agent, at least one surfactant, at least one photocatalyst and as dispersed material polyfluoroethylene (PTFE) or latex is contained.
  • the photocatalytically depositable dispersion is characterized in that it contains several functional mixture components.
  • a mixture component may in turn consist of one or more substances having the same function.
  • the functional mixture components are in detail
  • At least one dispersed substance At least one dispersed substance
  • At least one surfactant At least one surfactant
  • the method for depositing the photocatalytically depositable dispersion is based on the technical irradiation with suitable electromagnetic waves or photons. It is known that photocatalysts when irradiated with suitable electromagnetic waves or photons lead to chemical reactions.
  • the surfactant is decomposed.
  • “decomposition” of the surfactant also includes a modification of the surfactant to the extent that the surfactant effect is removed, which in turn results in the dispersion of the dispersed substance from the dispersion.
  • the photocatalyst is a titania-based drug. It is known that arise in the semiconductor titanium dioxide in the anatase and rutile modifications under irradiation of UV light electron-hole pairs, which migrate to the surface and generate highly reactive radicals there.
  • titanium dioxide can be modified so that the photocatalytic effect also occurs when exposed to visible light in the spectral range of about 400 to 700 nm wavelength. This modification takes place, for example, by doping the semiconductor with metal ions such as chromium, iron or manganese, or with nitrogen, with sulfur or with carbon.
  • the surfactant is radically decomposed or modified so that the surfactant effect is repealed.
  • the dispersant is water or a water-containing liquid. It is known that photocatalysts based on titanium dioxide lead to the formation of hydroxyl radicals by excitations with photons of ultraviolet (UV) light or visible light in an aqueous environment. These hydroxyl radicals in turn react intensively with other constituents of the
  • the hydroxyl radical then decomposes or modifies the surfactant so that the surface-active effect is abolished. This in turn has the consequence that the dispersed substance separates from the dispersion.
  • PTFE polytetrafluoroethylene
  • latex As a dispersed substance in particular PTFE (polytetrafluoroethylene) or latex is suitable.
  • PFT perfluorinated surfactants
  • 300 mg of the commercial titanium dioxide photocatalyst KRONOS vlp 7000 is dissolved in 100 ml of a 0.0039 mol% commercial Triton X 102 solution (octylphenol ethoxylate) from DOW containing 39 ppm Triton X 102, corresponding to 26 ppm total carbon content (TOC). by Ultra-Turrax at 9500 rev / min for 1 min dispersed. This suspension thus prepared is then irradiated by UV lamp (spectrum Figure 1) at a distance of 8 cm for 0, 150, 300 and 450 minutes.
  • UV lamp spectrum Figure 1
  • the total carbon content of the suspension is determined.
  • the Triton X content of the respective suspension is determined by means of the characteristic bands at 223 nm and 274 nm in the UV absorption spectrum (Table 1).
  • Table 1 shows that the total carbon content as well as the Triton X content decreases with the duration of the exposure.
  • Triton-X 102 solution but without titanium dioxide photocatalyst prepared in the same way and then irradiated by UV lamp in the same way.
  • Table 2 shows that without titanium dioxide photocatalyst the total carbon content as well as the Triton X content does not decrease with the duration of the exposure.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Catalysts (AREA)
  • Physical Water Treatments (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

L'invention concerne un procédé de précipitation par photocatalyse d'une substance dispersée à partir d'une dispersion tensioactive. La dispersion tensioactive contient au moins un agent de dispersion, une substance dispersée, un tensioactif et un photocatalyseur. Le dioxyde de titane qui est photoactif dans la partie ultraviolette et optionnellement aussi dans la partie du spectre visible convient notamment comme photocatalyseur. L'agent de dispersion est de préférence de l'eau ou un liquide contenant de l'eau. Les tensioactifs perfluorés (PFT) conviennent aussi, entre autres, comme tensioactif. Le procédé est caractérisé en ce que des substances sensibles à la température notamment, comme par exemple les polytétrafluoroéthylènes (PTFE), peuvent être précipitées de manière simple.
EP10707205A 2009-03-03 2010-02-04 Dispersion précipitable par photocatalyse Withdrawn EP2403622A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009011117A DE102009011117A1 (de) 2009-03-03 2009-03-03 Photokatalytisch abscheidbare Dispersion
PCT/EP2010/000678 WO2010099854A1 (fr) 2009-03-03 2010-02-04 Dispersion précipitable par photocatalyse

Publications (1)

Publication Number Publication Date
EP2403622A1 true EP2403622A1 (fr) 2012-01-11

Family

ID=42184054

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10707205A Withdrawn EP2403622A1 (fr) 2009-03-03 2010-02-04 Dispersion précipitable par photocatalyse

Country Status (7)

Country Link
US (1) US20100224480A1 (fr)
EP (1) EP2403622A1 (fr)
JP (1) JP2012519070A (fr)
AU (1) AU2010220643A1 (fr)
BR (1) BRPI1009111A2 (fr)
DE (1) DE102009011117A1 (fr)
WO (1) WO2010099854A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2470477A1 (fr) 2009-08-25 2012-07-04 Fahs Stagemyer LLC Procédés et utilisations de molécules à dissociation
US9073766B2 (en) 2009-08-25 2015-07-07 Fahs Stagemyer, Llc Methods for the treatment of ballast water

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4064303A (en) * 1974-09-27 1977-12-20 E. I. Du Pont De Nemours And Company Process for decorating heat-stable polymer coating compositions
WO1992007886A1 (fr) * 1990-10-30 1992-05-14 Dainippon Ink & Chemicals, Inc. Dispersion aqueuse de fluororesine particulaire gelifiee, production de cette dispersion et protection de materiaux inorganiques alcalins durcis
JPH0929243A (ja) * 1995-07-17 1997-02-04 Toray Ind Inc エマルジョン性含油排水の処理方法
JPH0947657A (ja) * 1995-08-10 1997-02-18 Toray Ind Inc 油水分離方法
JPH1046989A (ja) * 1996-05-31 1998-02-17 Toto Ltd 防汚性トンネル内壁
JP3797037B2 (ja) * 1998-12-04 2006-07-12 東陶機器株式会社 光触媒性親水性コーティング組成物
JP3959213B2 (ja) * 1999-06-30 2007-08-15 住友化学株式会社 酸化チタン、それを用いてなる光触媒体及び光触媒体コーティング剤
JP3949374B2 (ja) * 2000-07-17 2007-07-25 住友化学株式会社 酸化チタン、それを用いてなる光触媒体および光触媒体コーティング剤
NZ505774A (en) * 2000-07-17 2002-12-20 Ind Res Ltd Oxalate stabilised titania solutions and coating compositions and catalysts formed therefrom
CN1299373C (zh) * 2001-04-27 2007-02-07 松下电器产业株式会社 燃料电池用电极及其制造方法
AU2003901734A0 (en) * 2003-04-11 2003-05-01 Unisearch Limited Transparent superhydrophobic coating
JP2005060532A (ja) * 2003-08-12 2005-03-10 Taiyo Kogyo Corp 光触媒分散液及びその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010099854A1 *

Also Published As

Publication number Publication date
DE102009011117A1 (de) 2010-09-23
JP2012519070A (ja) 2012-08-23
BRPI1009111A2 (pt) 2016-03-01
AU2010220643A1 (en) 2011-08-25
US20100224480A1 (en) 2010-09-09
WO2010099854A1 (fr) 2010-09-10

Similar Documents

Publication Publication Date Title
DE69735209T2 (de) Photokatalysator mit ultrafeinen metallpartikeln, hochfunktionelles material beladen mit dem photokatalysator und methode zu ihrer herstellung
DE69900603T2 (de) Katalitische zusammenstellung
Fessi et al. Photocatalytic degradation enhancement in Pickering emulsions stabilized by solid particles of bare TiO2
DE60013043T2 (de) Titanoxid, dieses enthaltender Photokatalysator und photokatalytisches Beschichtungsmittel
Meephon et al. Heterogeneous photocatalytic degradation of diuron on zinc oxide: influence of surface-dependent adsorption on kinetics, degradation pathway, and toxicity of intermediates
Zhang et al. Novel anti-fouling Fe2O3/TiO2 nanowire membranes for humic acid removal from water
DE112010004190T5 (de) Durch Oberflächenladung aktivierte nanoporöse semipermeable Membran zur Entsalzung
EP2212373A2 (fr) Fabrication et utilisation de nouvelles polyanilines pour le traitement de l'eau
EP2981508B1 (fr) Procédé de séparation de composés organiques fluorés présents dans des fluides contaminés, éléments adsorbants utilisés à cette fin et kit d'éléments adsorbants
DE10394287T5 (de) Nanocomposit-Lösung mit komplexen Funktionen und Verfahren zu ihrer Herstellung
Ozmen et al. Photocatalytic degradation of azo dye using core@ shell nano-TiO 2 particles to reduce toxicity
EP4048074A1 (fr) Composition bioactive pour tuer des cellules
Bai et al. One-pot synthesis of Ag nanoparticles/ZnO nanorods heterostructures for organic dyes decoloring
EP3084039B1 (fr) Procédé de fabrication de revêtements métalliques structurés
WO1999033564A1 (fr) Photocatalyseurs tres poreux pour la mise en oeuvre de lumiere visible
EP2403622A1 (fr) Dispersion précipitable par photocatalyse
Saini et al. Magnetic graphene nanosheets from expired iron-supplemented tablets for hydroxyl-mediated photocatalytic oxidation of azo dyes
DE102011053753A1 (de) Poröses, sphärisches Titandioxid
DE10254575A1 (de) Photokatalytische Aktivkohle, farbige photokatalytische Aktivkohle, sich verfärbende Aktivkohle und Desodorierungs- und Adsorptionsprodukt, das diese verwendet, sowie Verfahren zum Reinigen von Erdreich
Bhogal et al. Ag 2 O–Al 2 O 3–ZrO 2 trimetallic nanocatalyst for high performance photodegradation of nicosulfuron herbicide
DE102012219918B4 (de) Funktionslack und Verfahren zu seiner Herstellung
Nalbandian Development and optimization of chemically-active electrospun nanofibers for treatment of impaired water sources
Agalya et al. Fabrication of PVA/TiO2 Composites Via Green Synthesis and Assessment of their Photodegradation and Anti-Germ Capabilities
Moodley et al. Degradation of o-Chloranil Using NanocrystallineCellulose/TiO2 Composites via a Solar Photocatalytic Route
EP3932551A1 (fr) Procédé de fabrication d'une feuille catalytiquement active et feuille pouvant être fabriquée selon ledit procédé

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20110902

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20120712