Porous Electrospun Fibers Embedding TiO2 for Adsorption and Photocatalytic Degradation of Water Pollutants

Chang Gu Lee, Hassan Javed, Danning Zhang, Jae Hong Kim, Paul Westerhoff, Qilin Li, Pedro J.J. Alvarez

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Using a bipolymer system consisting of polyvinylpyrrolidone (PVP) and poly(vinylidene fluoride) (PVDF), P25-TiO2 was immobilized into thin film mats of porous electrospun fibers. Pores were introduced by dissolving sacrificial PVP to increase surface area and enhance access to TiO2. The highest photocatalytic activity was achieved using a PVDF:PVP weight ratio of 2:1. Methylene blue (MB) was used to visualize contaminant removal, assess the sorption capacity (5.93 ± 0.23 mg/g) and demonstrate stable removal kinetics (kMB > 0.045 min-1) under UVA irradiation (3.64 × 10-9 einstein/cm2/s) over 10 cycles. Treatment was also accomplished via sequential MB sorption in the dark and subsequent photocatalytic degradation under UVA irradiation, to illustrate that these processes could be uncoupled to overcome limited light penetration. The photocatalytic mat degraded bisphenol A and 17α-ethynylestradiol in secondary wastewater effluent (17 mg TOC/L), and (relative to TiO2 slurry) immobilization of TiO2 in the mat mitigated performance inhibition by co-occurring organics that scavenge oxidation capacity. This significantly lowered the electrical energy-per-order of reaction (EEO) needed to remove such endocrine disruptors in the presence of oxidant scavenging/inhibitory organics. Thus, effective TiO2 immobilization into polymers with affinity toward specific priority pollutants could both increase the efficiency and reduce energy requirements of photocatalytic water treatment.

Original languageEnglish (US)
Pages (from-to)4285-4293
Number of pages9
JournalEnvironmental Science and Technology
Volume52
Issue number7
DOIs
StatePublished - Apr 3 2018

Fingerprint

Water Pollutants
Povidone
fluoride
immobilization
irradiation
sorption
Methylene Blue
adsorption
Adsorption
Degradation
degradation
endocrine disruptor
pollutant
Sorption
Fibers
oxidant
Irradiation
slurry
energy
Endocrine Disruptors

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Porous Electrospun Fibers Embedding TiO2 for Adsorption and Photocatalytic Degradation of Water Pollutants. / Lee, Chang Gu; Javed, Hassan; Zhang, Danning; Kim, Jae Hong; Westerhoff, Paul; Li, Qilin; Alvarez, Pedro J.J.

In: Environmental Science and Technology, Vol. 52, No. 7, 03.04.2018, p. 4285-4293.

Research output: Contribution to journalArticle

Lee, Chang Gu ; Javed, Hassan ; Zhang, Danning ; Kim, Jae Hong ; Westerhoff, Paul ; Li, Qilin ; Alvarez, Pedro J.J. / Porous Electrospun Fibers Embedding TiO2 for Adsorption and Photocatalytic Degradation of Water Pollutants. In: Environmental Science and Technology. 2018 ; Vol. 52, No. 7. pp. 4285-4293.
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