Efficient photocatalytic removal of phthalates easily implemented over a bi-functional {001}TiO2 surface

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Xiaotong Gu
  • Guangfeng Wei
  • Yiqiong Hu
  • Ya-nan Zhang
  • Guohua Zhao

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number128257
Journal / PublicationChemosphere
Volume263
Online published4 Sept 2020
Publication statusPublished - Jan 2021

Abstract

It is stubborn to remove the lowly concentrated phthalic acid esters (PAEs) that usually coexist with other highly concentrated but low-toxic pollutants in municipal sewage. Herein, we report a novel strategy for completely removing the PAEs over a bi-functional {001}TiO2 surface (with highly exposed {001} facet), which not only serve as functional sites to specifically adsorb the target PAEs pollutants, but also contribute to an enhanced oxidation ability. The adsorption behavior of PAEs on {001}TiO2 is analyzed deeply through kinetic experiments combining with in situ ATR-FTIR spectroscopy and theoretical calculations. The results reveal that the adsorption capacities of PAEs on {001}TiO2 are about 4–5 times higher than that on TiO2, both of which follow the pseudo-second-order and Langmuir model. This is mainly attributed to the interfacial Lewis Acid-Base Pair between {001} facet Ti5c sites and C=O of PAEs. Benefitting from the specific adsorption capability toward target pollutant and enhanced oxidation ability of {001} facets, nearly 100% of DMP or DEP in simulated wastewater can be eliminated by {001}TiO2 within 2 h illumination, and the relevant degradation rate constants (k) (3.67 h−1 for DMP and 2.19 h−1 for DEP) are 5.73 and 3.08 folds higher than that of pure TiO2, respectively. In the application of municipal wastewater, nearly 76% of DMP and 85% DEP can be eliminated by {001}TiO2 within 2 h illumination, which are nearly 3–6 fold higher than that of pure TiO2.

Research Area(s)

  • Bi-functional surface, Photocatalytic removal, Phthalates, Specific adsorption, {001}TiO2

Citation Format(s)

Efficient photocatalytic removal of phthalates easily implemented over a bi-functional {001}TiO2 surface. / Gu, Xiaotong; Qin, Ning; Wei, Guangfeng et al.
In: Chemosphere, Vol. 263, 128257, 01.2021.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review