國立虎尾科技大學 |

Treatment of Per- and Polyfluoroalkyl Substances (Pfas) in Semiconductor Wastewaters.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Treatment of Per- and Polyfluoroalkyl Substances (Pfas) in Semiconductor Wastewaters./
作者:	Nienhauser, Alec Brockway.
面頁冊數:	1 online resource (101 pages)
附註:	Source: Masters Abstracts International, Volume: 83-06.
Contained By:	Masters Abstracts International83-06.
標題:	Chemical engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9798759982036

Treatment of Per- and Polyfluoroalkyl Substances (Pfas) in Semiconductor Wastewaters.
Nienhauser, Alec Brockway.

Treatment of Per- and Polyfluoroalkyl Substances (Pfas) in Semiconductor Wastewaters. - 1 online resource (101 pages)

Source: Masters Abstracts International, Volume: 83-06.

Thesis (M.S.Tech.)--Arizona State University, 2021.

Includes bibliographical references

Per- and polyfluoroalkyl substances (PFAS) are anthropogenic chemicals used for a wide variety of products and industrial processes, including being an essential class of chemicals in the fabrication of semiconductors. Proven concerns related to bioaccumulation and toxicity across multiple species have resulted in health advisory and regulatory initiatives for PFAS in drinking and wastewaters. Among impacted users of PFAS, the semiconductor industry is in urgent need of technologies to remove PFAS from water. Specifically, they prefer technologies capable of mineralizing PFAS into inorganic fluoride (F-). The goal of this thesis is to compare the effectiveness of photo- versus electrocatalytic treatment in benchtop reactor systems PFAS in industrial wastewater before selecting one technology to investigate comprehensively. First, a model wastewater was developed based upon semiconductor samples to represent water matrices near where PFAS are used and the aggregate Fab effluent, which were then used in batch catalytic experiments. Second, batch experiments with homogenous photocatalysis (UV/SO32-) were found to be more energy-intensive than heterogeneous catalysis using boron-doped diamond (BDD) electrodes, and the latter approach was then studied in-depth. During electrocatalysis, longer chain PFAS (C8; PFOA & PFOS) were observed to degrade faster than C6 and C4 PFAS. This study is the first to report near-complete defluorination of not only C8- and C6- PFAS, but also C4-PFAS, in model wastewaters using BDD electrocatalysis, and the first to report such degradation in real Fab wastewater effluents. Based upon differences in PFAS degradation rates observed in single-solute systems containing only C4 PFAS versus multi-solute systems including C4, C6, and C8 PFAS, it was concluded that the surfactant properties of the longer-chain PFAS created surface films on the BDD electrode surface which synergistically enhanced removal of shorter-chain PFAS. The results from batch experiments that serve as the basis of this thesis will be used to assess the chemical byproducts and their associated bioaccumulation and toxicity. This thesis was aimed at developing an efficient method for the degradation of perfluoroalkyl substances from industrial process waters at realistic concentrations.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798759982036Subjects--Topical Terms:

555952
Chemical engineering.
Subjects--Index Terms:

ElectrochemistryIndex Terms--Genre/Form:

554714
Electronic books.

Treatment of Per- and Polyfluoroalkyl Substances (Pfas) in Semiconductor Wastewaters.
LDR:03710ntm a22004097 4500 001 1148119
005 20240916070004.5
006 m o d
007 cr bn ---uuuuu
008 250605s2021 xx obm 000 0 eng d
020 $a 9798759982036
035 $a (MiAaPQ)AAI28413929
035 $a AAI28413929
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Nienhauser, Alec Brockway. $3 1474016
245 1 0 $a Treatment of Per- and Polyfluoroalkyl Substances (Pfas) in Semiconductor Wastewaters.
264 0 $c 2021
300 $a 1 online resource (101 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 83-06.
500 $a Advisor: Westerhoff, Paul.
502 $a Thesis (M.S.Tech.)--Arizona State University, 2021.
504 $a Includes bibliographical references
520 $a Per- and polyfluoroalkyl substances (PFAS) are anthropogenic chemicals used for a wide variety of products and industrial processes, including being an essential class of chemicals in the fabrication of semiconductors. Proven concerns related to bioaccumulation and toxicity across multiple species have resulted in health advisory and regulatory initiatives for PFAS in drinking and wastewaters. Among impacted users of PFAS, the semiconductor industry is in urgent need of technologies to remove PFAS from water. Specifically, they prefer technologies capable of mineralizing PFAS into inorganic fluoride (F-). The goal of this thesis is to compare the effectiveness of photo- versus electrocatalytic treatment in benchtop reactor systems PFAS in industrial wastewater before selecting one technology to investigate comprehensively. First, a model wastewater was developed based upon semiconductor samples to represent water matrices near where PFAS are used and the aggregate Fab effluent, which were then used in batch catalytic experiments. Second, batch experiments with homogenous photocatalysis (UV/SO32-) were found to be more energy-intensive than heterogeneous catalysis using boron-doped diamond (BDD) electrodes, and the latter approach was then studied in-depth. During electrocatalysis, longer chain PFAS (C8; PFOA & PFOS) were observed to degrade faster than C6 and C4 PFAS. This study is the first to report near-complete defluorination of not only C8- and C6- PFAS, but also C4-PFAS, in model wastewaters using BDD electrocatalysis, and the first to report such degradation in real Fab wastewater effluents. Based upon differences in PFAS degradation rates observed in single-solute systems containing only C4 PFAS versus multi-solute systems including C4, C6, and C8 PFAS, it was concluded that the surfactant properties of the longer-chain PFAS created surface films on the BDD electrode surface which synergistically enhanced removal of shorter-chain PFAS. The results from batch experiments that serve as the basis of this thesis will be used to assess the chemical byproducts and their associated bioaccumulation and toxicity. This thesis was aimed at developing an efficient method for the degradation of perfluoroalkyl substances from industrial process waters at realistic concentrations.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Chemical engineering. $3 555952
650 4 $a Water resources management. $3 1178858
650 4 $a Environmental engineering. $3 557376
653 $a Electrochemistry
653 $a Industrial Wastewater
653 $a Perfluoroalkyl Subtances
653 $a PFAS
653 $a Semiconductor
653 $a Water Treatment
655 7 $a Electronic books. $2 local $3 554714
690 $a 0775
690 $a 0595
690 $a 0542
710 2 $a Arizona State University. $b Chemical Engineering. $3 1182447
710 2 $a ProQuest Information and Learning Co. $3 1178819
773 0 $t Masters Abstracts International $g 83-06.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28413929 $z click for full text (PQDT)