The visible light-driven photodegradation of dimethyl sulfide on S-doped TiO 2 : Characterization, kinetics, and reaction pathways

Lin, Yih‐Hwang; Hsueh, Hsin Ta; Chang, Chia‐Lun; Chu, Hsin

doi:10.1016/j.apcatb.2016.06.024

Cited by 111 publications

(60 citation statements)

References 43 publications

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“…and nonmental (N, S, I, etc.) doping, artificial crystal structure modification, and carbonaceous nanomaterial compositing (carbon nanotubes, graphene, and fullerenes) [4][5][6][7][8][9][10]. Nevertheless, the visible-light energy conversion remains insufficient due to little solar light absorption and many carrier-recombination centers [11,12].…”

Section: Introductionmentioning

confidence: 99%

Liquid-Plasma Hydrogenated Synthesis of Gray Titania with Engineered Surface Defects and Superior Photocatalytic Activity

Zhang

Feng

et al. 2020

Nanomaterials

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Defect engineering in photocatalysts recently exhibits promising performances in solar-energy-driven reactions. However, defect engineering techniques developed so far rely on complicated synthesis processes and harsh experimental conditions, which seriously hinder its practical applications. In this work, we demonstrated a facile mass-production approach to synthesize gray titania with engineered surface defects. This technique just requires a simple liquid-plasma treatment under low temperature and atmospheric pressure. The in situ generation of hydrogen atoms caused by liquid plasma is responsible for hydrogenation of TiO 2 . Electron paramagnetic resonance (EPR) measurements confirm the existence of surface oxygen vacancies and Ti 3+ species in gray TiO 2−x . Both kinds of defects concentrations are well controllable and increase with the output plasma power. UV-Vis diffused reflectance spectra show that the bandgap of gray TiO 2−x is 2.9 eV. Due to its extended visible-light absorption and engineered surface defects, gray TiO 2−x exhibits superior visible-light photoactivity. Rhodamine B was used to evaluate the visible-light photodegradation performance, which shows that the removal rate constant of gray TiO 2−x reaches 0.126 min −1 and is 6.5 times of P25 TiO 2 . The surface defects produced by liquid-plasma hydrogenation are proved stable in air and water and could be a candidate hydrogenation strategy for other photocatalysts.Nanomaterials 2020, 10, 342 2 of 13 light absorption, prompting superior performances in photodegradation and water splitting [13][14][15]. The enhanced solar light absorption of black TiO 2 is ascribed to additional intermediate electronic states (e.g., V o or Ti 3+ states) and disorder surface caused by hydrogenation [16][17][18]. More importantly, defect engineering, for instance defects concentration and distribution, also plays an important role in tuning photocatalytic activity of black TiO 2 . It was reported that the high defect ratio of surface to bulk can significantly enhance the photoactivity owing to preferential diffusion from bulk to surface of photoinduced charges [19,20]. However, surface defects are not stable enough as it can be spontaneously oxidized in air and water. So far, mainstream strategies to synthesize black/gray TiO 2−x are relied on the reduction of pristine stoichiometric TiO 2 [20][21][22][23][24], such as annealing under high pressures of H 2 or NH 3 , high-energy particle bombardment (hydrogen plasma, laser plasma, or high-energy electrons), and chemical reduction with reducing agent in vacuum. Apparently, it is significant and desirable to develop a simple and feasible strategy for massive production of black/gray TiO 2−x with engineered surface defects and related abundant solar absorption.Hereafter, we conduct a one-pot synthesis of gray TiO 2−x with large solar harvesting and engineered surface defects using a liquid-plasma technology at room temperature and atmospheric pressure [25]. There has recently been increasing interest in liquid-plasma...

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Section: Introductionmentioning

confidence: 99%

Liquid-Plasma Hydrogenated Synthesis of Gray Titania with Engineered Surface Defects and Superior Photocatalytic Activity

Zhang

Feng

et al. 2020

Nanomaterials

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“…Among the techniques, photocatalysis is attracting considerable interest due to its ability to break down a wide range of organic pollutants into CO 2 and H 2 O as end-products under ambient conditions. 11,12 However, limited studies have reported the photocatalytic oxidation of volatile organic compounds like dimethyl sulfide, 13 BTEX 14 and isovaleraldehyde. Magnetic nanoparticles have attracted attention owing to their interesting properties and useful applications compared to those of the bulk, the most prominent being zinc-ferrite.…”

Section: Introductionmentioning

confidence: 99%

Enhanced visible light photocatalysis with E‐waste‐based V₂O₅/zinc–ferrite: BTEX degradation and mechanism

Mohan

Lim

Lee

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: BTEX removal is attracting increased attention owing to the detrimental impacts caused to human health, the foremost being neurological impairments. Thus, this study intended to assess the efficiency of zinc-ferrite/V 2 O 5 (ZFV) nanocomposite for photocatalytic degradation of BTEX isomers in aqueous solution. Furthermore, the developed catalyst was magnetically separable, which may reduce the ecological impacts of the catalyst. RESULTS: The ZFV nanocomposite was prepared by a solvothermal process using V 2 O 5 (extracted from treated E-waste) and zincferrite (synthesized through a chemical co-precipitation method). The integration of elements in the ZFV nanocomposite was confirmed using powder X-ray diffraction, Fourier transform infrared, Raman, diffuse reflectance and electrochemical impedance spectroscopies and scanning electron microscopy. Maximum BTEX degradation of 95% was achieved at 50 mg L −1 initial BTEX concentration, 0.50 g L −1 catalyst and pH 3. A minor decrease in the degradation efficiency (10%) of the catalyst was observed at the fifth cycle. The presence of H 2 O 2 increased the degradation efficiency to 98% owing to the prevention of electron-hole recombination, while NaCl (60%), Na 2 CO 3 (63%), NaNO 3 (80%) and Na 2 SO 4 (72%) decreased the degradation efficiency due to their hydroxyl scavenging properties. The degradation pathway was elucidated using gas chromatography with mass spectral studies. CONCLUSIONS: The findings of the present study relating to BTEX degradation using the magnetic ZFV nanocomposite and the degradation mechanism throw light on the environmental applications of the ZFV composite. The composite could be an alternative for the remediation of BTEX-contaminated wastewaters.

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“…Equation (3) is the much known expression of L-H model and has been widely used in investigating the kinetics of photocatalytic reactions. Lin et al [23] studied the photocatalytic degradation pathway of dimethyl sulfide. They used original and derivative L-H models to study the kinetics under different temperatures and found that temperature can enhance photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Modification to L-H Kinetics Model and Its Application in the Investigation on Photodegradation of Gaseous Benzene by Nitrogen-Doped TiO2

et al. 2018

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In this paper, the Langmuir-Hinshelwood (L-H) model has been used to investigate the kinetics of photodegradation of gaseous benzene by nitrogen-doped TiO 2 (N-TiO 2 ) at 25 • C under visible light irradiation. Experimental results show that the photoreaction coefficient k pm increased from 3.992 × 10 −6 mol·kg −1 ·s −1 to 11.55 × 10 −6 mol·kg −1 ·s −1 along with increasing illumination intensity. However, the adsorption equilibrium constant K L decreased from 1139 to 597 m 3 ·mol −1 when the illumination intensity increased from 36.7 × 10 4 lx to 75.1 × 10 4 lx, whereas it was 2761 m 3 ·mol −1 in the absence of light. This is contrary to the fact that K L should be a constant if the temperature was fixed. This phenomenon can be attributed to the breaking of the adsorption-desorption equilibrium by photocatalytically decomposition. To compensate for the disequilibrium of the adsorption-desorption process, photoreaction coefficient k pm was introduced to the expression of K L and the compensation form was denoted as K m . K L is an indicator of the adsorption capacity of TiO 2 while K m is only an indicator of the coverage ratio of TiO 2 surface. The modified L-H model has been experimentally verified so it is expected to be used to predict the kinetics of the photocatalytic degradation of gaseous benzene.

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The visible light-driven photodegradation of dimethyl sulfide on S-doped TiO 2 : Characterization, kinetics, and reaction pathways

Cited by 111 publications

References 43 publications

Liquid-Plasma Hydrogenated Synthesis of Gray Titania with Engineered Surface Defects and Superior Photocatalytic Activity

Liquid-Plasma Hydrogenated Synthesis of Gray Titania with Engineered Surface Defects and Superior Photocatalytic Activity

Enhanced visible light photocatalysis with E‐waste‐based V₂O₅/zinc–ferrite: BTEX degradation and mechanism

Modification to L-H Kinetics Model and Its Application in the Investigation on Photodegradation of Gaseous Benzene by Nitrogen-Doped TiO2

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The visible light-driven photodegradation of dimethyl sulfide on S-doped TiO 2 : Characterization, kinetics, and reaction pathways

Cited by 111 publications

References 43 publications

Liquid-Plasma Hydrogenated Synthesis of Gray Titania with Engineered Surface Defects and Superior Photocatalytic Activity

Liquid-Plasma Hydrogenated Synthesis of Gray Titania with Engineered Surface Defects and Superior Photocatalytic Activity

Enhanced visible light photocatalysis with E‐waste‐based V2O5/zinc–ferrite: BTEX degradation and mechanism

Modification to L-H Kinetics Model and Its Application in the Investigation on Photodegradation of Gaseous Benzene by Nitrogen-Doped TiO2

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Enhanced visible light photocatalysis with E‐waste‐based V₂O₅/zinc–ferrite: BTEX degradation and mechanism