Effect of dissolved natural organic matter on the photocatalytic micropollutant removal performance of TiO2 nanotube array

Yin Ye, Harry Bruning, Wanrong Liu, Huub Rijnaarts, Doekle Yntema

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

The TiO2 nanotube array (TNA) is a promising photocatalyst for removal of micropollutants from water, but better understanding on its applicability in complex water matrices is still desired. Therefore this study investigates the effect of dissolved natural organic matter (NOMs) on 4-chloro-2-methylphenoxyacetic acid (MCPA, a typical micropollutant found in many water bodies) removal performance of TNA. The present study shows that although in bulk liquid phase NOMs would undergo photosensitization that can contribute to MCPA removal, the overall effect of NOMs on MCPA removal is detrimental due to the interaction between NOMs and the TNA surface: the total removal of MCPA decreased from 94.3% to 62.0% and 61.8%, in the presence of only 5 mg/L SWR-NOM and UMR-NOM respectively. Acidic pH was found to be able to mitigate the detrimental effect of NOMs (the total removal of MCPA was only decreased from 94.5% to 83.3% and 88.8% under acidic pH, in the presence of 15 mg/L SWR-NOM and UMR-NOM respectively), and the photosensitization effect of NOMs was strengthened; while under alkaline pH conditions the detrimental effect of NOMs completely vanished (the total removal of MCPA increased from 45.7% to 55.7% and 60.5% in the presence of 15 mg/L SWR-NOM and UMR-NOM respectively). Two commonly present co-existing anions, i.e. phosphate and bicarbonate, also mitigate the detrimental effect of NOMs. With 15 mg/L SWR-NOM: the presence of 100 mg/L bicarbonate increased the total removal of MCPA from 49.1% to 65.1%; the presence of 100 mg/L phosphate increased the total removal of MCPA from 49.1% to 62.5%. With 15 mg/L SWR-NOM, the presence of 100 mg/L bicarbonate increased the total removal of MCPA from 45.2% to 56.1%; the presence of 100 mg/L phosphate increased the total removal of MCPA from 45.2% to 62.9%. The photocurrent measurement support that the presence of such anions greatly suppresses the h + scavenging effect of NOMs; while other anions, i.e. chloride, nitrate, sulfate, showed no notable effect.

LanguageEnglish
Pages216-222
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume371
DOIs
Publication statusPublished - 15 Feb 2019

Fingerprint

2-Methyl-4-chlorophenoxyacetic Acid
Biological materials
Nanotubes
nanotubes
Bicarbonates
Anions
carbonates
phosphates
Phosphates
Negative ions
anions
Water
water
Scavenging
scavenging
Photocatalysts
Photocurrents
Nitrates
Sulfates
photocurrents

Keywords

  • MCPA
  • Micropollutant
  • Natural organic matter
  • Photocatalysis
  • TiO nanotube array

Cite this

@article{23612eea67f84cbbb3b63189377f2516,
title = "Effect of dissolved natural organic matter on the photocatalytic micropollutant removal performance of TiO2 nanotube array",
abstract = "The TiO2 nanotube array (TNA) is a promising photocatalyst for removal of micropollutants from water, but better understanding on its applicability in complex water matrices is still desired. Therefore this study investigates the effect of dissolved natural organic matter (NOMs) on 4-chloro-2-methylphenoxyacetic acid (MCPA, a typical micropollutant found in many water bodies) removal performance of TNA. The present study shows that although in bulk liquid phase NOMs would undergo photosensitization that can contribute to MCPA removal, the overall effect of NOMs on MCPA removal is detrimental due to the interaction between NOMs and the TNA surface: the total removal of MCPA decreased from 94.3{\%} to 62.0{\%} and 61.8{\%}, in the presence of only 5 mg/L SWR-NOM and UMR-NOM respectively. Acidic pH was found to be able to mitigate the detrimental effect of NOMs (the total removal of MCPA was only decreased from 94.5{\%} to 83.3{\%} and 88.8{\%} under acidic pH, in the presence of 15 mg/L SWR-NOM and UMR-NOM respectively), and the photosensitization effect of NOMs was strengthened; while under alkaline pH conditions the detrimental effect of NOMs completely vanished (the total removal of MCPA increased from 45.7{\%} to 55.7{\%} and 60.5{\%} in the presence of 15 mg/L SWR-NOM and UMR-NOM respectively). Two commonly present co-existing anions, i.e. phosphate and bicarbonate, also mitigate the detrimental effect of NOMs. With 15 mg/L SWR-NOM: the presence of 100 mg/L bicarbonate increased the total removal of MCPA from 49.1{\%} to 65.1{\%}; the presence of 100 mg/L phosphate increased the total removal of MCPA from 49.1{\%} to 62.5{\%}. With 15 mg/L SWR-NOM, the presence of 100 mg/L bicarbonate increased the total removal of MCPA from 45.2{\%} to 56.1{\%}; the presence of 100 mg/L phosphate increased the total removal of MCPA from 45.2{\%} to 62.9{\%}. The photocurrent measurement support that the presence of such anions greatly suppresses the h + scavenging effect of NOMs; while other anions, i.e. chloride, nitrate, sulfate, showed no notable effect.",
keywords = "MCPA, Micropollutant, Natural organic matter, Photocatalysis, TiO nanotube array",
author = "Yin Ye and Harry Bruning and Wanrong Liu and Huub Rijnaarts and Doekle Yntema",
year = "2019",
month = "2",
day = "15",
doi = "10.1016/j.jphotochem.2018.11.012",
language = "English",
volume = "371",
pages = "216--222",
journal = "Journal of Photochemistry and Photobiology. A, Chemistry",
issn = "1010-6030",
publisher = "Elsevier",

}

Effect of dissolved natural organic matter on the photocatalytic micropollutant removal performance of TiO2 nanotube array. / Ye, Yin; Bruning, Harry; Liu, Wanrong; Rijnaarts, Huub; Yntema, Doekle.

In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 371, 15.02.2019, p. 216-222.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Effect of dissolved natural organic matter on the photocatalytic micropollutant removal performance of TiO2 nanotube array

AU - Ye, Yin

AU - Bruning, Harry

AU - Liu, Wanrong

AU - Rijnaarts, Huub

AU - Yntema, Doekle

PY - 2019/2/15

Y1 - 2019/2/15

N2 - The TiO2 nanotube array (TNA) is a promising photocatalyst for removal of micropollutants from water, but better understanding on its applicability in complex water matrices is still desired. Therefore this study investigates the effect of dissolved natural organic matter (NOMs) on 4-chloro-2-methylphenoxyacetic acid (MCPA, a typical micropollutant found in many water bodies) removal performance of TNA. The present study shows that although in bulk liquid phase NOMs would undergo photosensitization that can contribute to MCPA removal, the overall effect of NOMs on MCPA removal is detrimental due to the interaction between NOMs and the TNA surface: the total removal of MCPA decreased from 94.3% to 62.0% and 61.8%, in the presence of only 5 mg/L SWR-NOM and UMR-NOM respectively. Acidic pH was found to be able to mitigate the detrimental effect of NOMs (the total removal of MCPA was only decreased from 94.5% to 83.3% and 88.8% under acidic pH, in the presence of 15 mg/L SWR-NOM and UMR-NOM respectively), and the photosensitization effect of NOMs was strengthened; while under alkaline pH conditions the detrimental effect of NOMs completely vanished (the total removal of MCPA increased from 45.7% to 55.7% and 60.5% in the presence of 15 mg/L SWR-NOM and UMR-NOM respectively). Two commonly present co-existing anions, i.e. phosphate and bicarbonate, also mitigate the detrimental effect of NOMs. With 15 mg/L SWR-NOM: the presence of 100 mg/L bicarbonate increased the total removal of MCPA from 49.1% to 65.1%; the presence of 100 mg/L phosphate increased the total removal of MCPA from 49.1% to 62.5%. With 15 mg/L SWR-NOM, the presence of 100 mg/L bicarbonate increased the total removal of MCPA from 45.2% to 56.1%; the presence of 100 mg/L phosphate increased the total removal of MCPA from 45.2% to 62.9%. The photocurrent measurement support that the presence of such anions greatly suppresses the h + scavenging effect of NOMs; while other anions, i.e. chloride, nitrate, sulfate, showed no notable effect.

AB - The TiO2 nanotube array (TNA) is a promising photocatalyst for removal of micropollutants from water, but better understanding on its applicability in complex water matrices is still desired. Therefore this study investigates the effect of dissolved natural organic matter (NOMs) on 4-chloro-2-methylphenoxyacetic acid (MCPA, a typical micropollutant found in many water bodies) removal performance of TNA. The present study shows that although in bulk liquid phase NOMs would undergo photosensitization that can contribute to MCPA removal, the overall effect of NOMs on MCPA removal is detrimental due to the interaction between NOMs and the TNA surface: the total removal of MCPA decreased from 94.3% to 62.0% and 61.8%, in the presence of only 5 mg/L SWR-NOM and UMR-NOM respectively. Acidic pH was found to be able to mitigate the detrimental effect of NOMs (the total removal of MCPA was only decreased from 94.5% to 83.3% and 88.8% under acidic pH, in the presence of 15 mg/L SWR-NOM and UMR-NOM respectively), and the photosensitization effect of NOMs was strengthened; while under alkaline pH conditions the detrimental effect of NOMs completely vanished (the total removal of MCPA increased from 45.7% to 55.7% and 60.5% in the presence of 15 mg/L SWR-NOM and UMR-NOM respectively). Two commonly present co-existing anions, i.e. phosphate and bicarbonate, also mitigate the detrimental effect of NOMs. With 15 mg/L SWR-NOM: the presence of 100 mg/L bicarbonate increased the total removal of MCPA from 49.1% to 65.1%; the presence of 100 mg/L phosphate increased the total removal of MCPA from 49.1% to 62.5%. With 15 mg/L SWR-NOM, the presence of 100 mg/L bicarbonate increased the total removal of MCPA from 45.2% to 56.1%; the presence of 100 mg/L phosphate increased the total removal of MCPA from 45.2% to 62.9%. The photocurrent measurement support that the presence of such anions greatly suppresses the h + scavenging effect of NOMs; while other anions, i.e. chloride, nitrate, sulfate, showed no notable effect.

KW - MCPA

KW - Micropollutant

KW - Natural organic matter

KW - Photocatalysis

KW - TiO nanotube array

U2 - 10.1016/j.jphotochem.2018.11.012

DO - 10.1016/j.jphotochem.2018.11.012

M3 - Article

VL - 371

SP - 216

EP - 222

JO - Journal of Photochemistry and Photobiology. A, Chemistry

T2 - Journal of Photochemistry and Photobiology. A, Chemistry

JF - Journal of Photochemistry and Photobiology. A, Chemistry

SN - 1010-6030

ER -