Report
Visible Light Responsive Catalysts Using Quantum Dot-Modified Ti02 for Air and Water Purification
| العنوان: | Visible Light Responsive Catalysts Using Quantum Dot-Modified Ti02 for Air and Water Purification |
|---|---|
| المؤلفون: | Coutts, Janelle L, Levine, Lanfang H, Richards, Jeffrey T, Hintze, paul, Clausen, Christian |
| بيانات النشر: | United States: NASA Center for Aerospace Information (CASI), 2012. |
| سنة النشر: | 2012 |
| مصطلحات موضوعية: | Man/System Technology And Life Support |
| الوصف: | The method of photocatalysis utilizing titanium dioxide, TiO2, as the catalyst has been widely studied for trace contaminant control for both air and water applications because of its low energy consumption and use of a regenerable catalyst. Titanium dioxide requires ultraviolet light for activation due to its band gap energy of 3.2 eV. Traditionally, Hg-vapor fluorescent light sources are used in PCO reactors and are a setback for the technology for space application due to the possibility of Hg contamination. The development of a visible light responsive (VLR) TiO2-based catalyst could lead to the use of solar energy in the visible region (approx.45% of the solar spectrum lies in the visible region; > 400 nm) or highly efficient LEDs (with wavelengths > 400 nm) to make PCO approaches more efficient, economical, and safe. Though VLR catalyst development has been an active area of research for the past two decades, there are few commercially available VLR catalysts; those that are available still have poor activity in the visible region compared to that in the UV region. Thus, this study was aimed at the further development of VLR catalysts by a new method - coupling of quantum dots (QD) of a narrow band gap semiconductor (e.g., CdS, CdSe, PbS, ZnSe, etc.) to the TiO2 by two preparation methods: 1) photodeposition and 2) mechanical alloying using a high-speed ball mill. A library of catalysts was developed and screened for gas and aqueous phase applications, using ethanol and 4-chlorophenol as the target contaminants, respectively. Both target compounds are well studied in photocatalytic systems serve as model contaminants for this research. Synthesized catalysts were compared in terms of preparation method, type of quantum dots, and dosage of quantum dots. |
| نوع الوثيقة: | Report |
| اللغة: | English |
| URL الوصول: | https://ntrs.nasa.gov/citations/20130000607 |
| ملاحظات: | NNK11EA08C |
| رقم الانضمام: | edsnas.20130000607 |
| قاعدة البيانات: | NASA Technical Reports |
| ResultId |
1 |
|---|---|
| Header |
edsnas NASA Technical Reports edsnas.20130000607 834 3 Report report 833.984313964844 |
| PLink |
https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=edsnas&AN=edsnas.20130000607&custid=s6537998&authtype=sso |
| FullText |
Array
(
[Availability] => 0
)
Array ( [0] => Array ( [Url] => https://ntrs.nasa.gov/citations/20130000607# [Name] => EDS - NASA Technical Reports [Category] => fullText [Text] => View record in NASA Technical Reports [MouseOverText] => View record in NASA Technical Reports ) ) |
| Items |
Array
(
[Name] => Title
[Label] => Title
[Group] => Ti
[Data] => Visible Light Responsive Catalysts Using Quantum Dot-Modified Ti02 for Air and Water Purification
)
Array ( [Name] => Author [Label] => Authors [Group] => Au [Data] => <searchLink fieldCode="AR" term="%22Coutts%2C+Janelle+L%22">Coutts, Janelle L</searchLink><br /><searchLink fieldCode="AR" term="%22Levine%2C+Lanfang+H%22">Levine, Lanfang H</searchLink><br /><searchLink fieldCode="AR" term="%22Richards%2C+Jeffrey+T%22">Richards, Jeffrey T</searchLink><br /><searchLink fieldCode="AR" term="%22Hintze%2C+paul%22">Hintze, paul</searchLink><br /><searchLink fieldCode="AR" term="%22Clausen%2C+Christian%22">Clausen, Christian</searchLink> ) Array ( [Name] => Publisher [Label] => Publisher Information [Group] => PubInfo [Data] => United States: NASA Center for Aerospace Information (CASI), 2012. ) Array ( [Name] => DatePubCY [Label] => Publication Year [Group] => Date [Data] => 2012 ) Array ( [Name] => Subject [Label] => Subject Terms [Group] => Su [Data] => <searchLink fieldCode="DE" term="%22Man%2FSystem+Technology+And+Life+Support%22">Man/System Technology And Life Support</searchLink> ) Array ( [Name] => Abstract [Label] => Description [Group] => Ab [Data] => The method of photocatalysis utilizing titanium dioxide, TiO2, as the catalyst has been widely studied for trace contaminant control for both air and water applications because of its low energy consumption and use of a regenerable catalyst. Titanium dioxide requires ultraviolet light for activation due to its band gap energy of 3.2 eV. Traditionally, Hg-vapor fluorescent light sources are used in PCO reactors and are a setback for the technology for space application due to the possibility of Hg contamination. The development of a visible light responsive (VLR) TiO2-based catalyst could lead to the use of solar energy in the visible region (approx.45% of the solar spectrum lies in the visible region; > 400 nm) or highly efficient LEDs (with wavelengths > 400 nm) to make PCO approaches more efficient, economical, and safe. Though VLR catalyst development has been an active area of research for the past two decades, there are few commercially available VLR catalysts; those that are available still have poor activity in the visible region compared to that in the UV region. Thus, this study was aimed at the further development of VLR catalysts by a new method - coupling of quantum dots (QD) of a narrow band gap semiconductor (e.g., CdS, CdSe, PbS, ZnSe, etc.) to the TiO2 by two preparation methods: 1) photodeposition and 2) mechanical alloying using a high-speed ball mill. A library of catalysts was developed and screened for gas and aqueous phase applications, using ethanol and 4-chlorophenol as the target contaminants, respectively. Both target compounds are well studied in photocatalytic systems serve as model contaminants for this research. Synthesized catalysts were compared in terms of preparation method, type of quantum dots, and dosage of quantum dots. ) Array ( [Name] => TypeDocument [Label] => Document Type [Group] => TypDoc [Data] => Report ) Array ( [Name] => Language [Label] => Language [Group] => Lang [Data] => English ) Array ( [Name] => URL [Label] => Access URL [Group] => URL [Data] => <link linkTarget="URL" linkTerm="https://ntrs.nasa.gov/citations/20130000607" linkWindow="_blank">https://ntrs.nasa.gov/citations/20130000607</link> ) Array ( [Name] => Note [Label] => Notes [Group] => [Data] => NNK11EA08C ) Array ( [Name] => AN [Label] => Accession Number [Group] => ID [Data] => edsnas.20130000607 ) |
| RecordInfo |
Array
(
[BibEntity] => Array
(
[Languages] => Array
(
[0] => Array
(
[Text] => English
)
)
[Subjects] => Array
(
[0] => Array
(
[SubjectFull] => Man/System Technology And Life Support
[Type] => general
)
)
[Titles] => Array
(
[0] => Array
(
[TitleFull] => Visible Light Responsive Catalysts Using Quantum Dot-Modified Ti02 for Air and Water Purification
[Type] => main
)
)
)
[BibRelationships] => Array
(
[HasContributorRelationships] => Array
(
[0] => Array
(
[PersonEntity] => Array
(
[Name] => Array
(
[NameFull] => Coutts, Janelle L
)
)
)
[1] => Array
(
[PersonEntity] => Array
(
[Name] => Array
(
[NameFull] => Levine, Lanfang H
)
)
)
[2] => Array
(
[PersonEntity] => Array
(
[Name] => Array
(
[NameFull] => Richards, Jeffrey T
)
)
)
[3] => Array
(
[PersonEntity] => Array
(
[Name] => Array
(
[NameFull] => Hintze, paul
)
)
)
[4] => Array
(
[PersonEntity] => Array
(
[Name] => Array
(
[NameFull] => Clausen, Christian
)
)
)
)
[IsPartOfRelationships] => Array
(
[0] => Array
(
[BibEntity] => Array
(
[Dates] => Array
(
[0] => Array
(
[D] => 01
[M] => 01
[Type] => published
[Y] => 2012
)
)
[Identifiers] => Array
(
[0] => Array
(
[Type] => issn-locals
[Value] => edsnas
)
)
)
)
)
)
)
|
| IllustrationInfo |