Abstract

The fluorine‐ and nitrogen‐codoped TiO2 was synthesized by ultrasonic spray pyrolysis method with titanium tetrafluoride and urea as precursor. The codoped TiO2 was characterized by X‐ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS), and X‐ray photoelectron spectroscopy (XPS). Nitric oxide (NO) photocatalytic oxidation in gas‐phase medium was employed as a probe reaction to evaluate the photocatalytic reactivity of the catalysts. The results indicated that spherical codoped TiO2 photocatalysts with unique puckered surface were obtained by this method. The codoped catalysts have solely anatase crystalline structure. The optical characterization of the codoped catalysts showed that the codoped samples could be excited by visible light photons in the 400–550 nm and could efficiently oxidize NO under visible light irradiation. The mechanism of special morphology formation of prepared codoped TiO2 structure is also discussed.

Highlights

  • IntroductionGrowing knowledge about the indoor air quality (IAQ) has validated it as one of the major risks of the human health as people spend more than 80% of their time indoors in most countries [1]

  • The codoped TiO2 was characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS)

  • Nitric oxide (NO) photocatalytic oxidation in gas-phase medium was employed as a probe reaction to evaluate the photocatalytic reactivity of the catalysts

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Summary

Introduction

Growing knowledge about the indoor air quality (IAQ) has validated it as one of the major risks of the human health as people spend more than 80% of their time indoors in most countries [1]. Doping TiO2 with various elements has been proved as an effective method to optimize the band structure of TiO2, and thereby in resulting to be a visible-light sensitive photocatalyst. It is meaningful to further study the properties of N- and F-codoped TiO2 and the synergistic effects between the N and F dopants in the catalyst Synthetic methods such as sol-gel and hydrothermal technique have been widely used to make codoped TiO2 photocatalyst which have advantages including precise control of pore structure, dopant concentration, and chemical purity [35,36,37]; they require severe conditions such as long time for reaction or high-pressure resistant equipment which is not easy to produce in large scale. The dopant of such TiO2 sphere is controlled by regulating the experimental conditions

Experimental Section
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Result and Discussion
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