Outstanding Performance of Recyclable Amorphous MoS<sub>3</sub> Supported on TiO<sub>2</sub> for Capturing High Concentrations of Gaseous Elemental Mercury: Mechanism, Kinetics, and Application

Mei, Jian; Wang, Chang; Kong, Lingnan; Liu, Xiaoli; Hu, Qixing; Zhao, Hui; Yang, Shijian

doi:10.1021/acs.est.9b00464

Cited by 99 publications

(135 citation statements)

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“…It has been reported that the initial pH value of the solution is an important factor which affects the photocatalytic performance. In general, the initial pH value affects the adsorption and dissociation behaviour of reactant molecules, the surface charge of the titanium dioxide, oxidation potential and other physico-chemical properties [37]. Besides, electrostatic attraction or repulsion between the catalysts and the reactant molecules results in an enhancement or suppression of the photocatalytic rate.…”

Section: Resultsmentioning

confidence: 99%

Rapid preparation of terbium-doped titanium dioxide nanoparticles and their enhanced photocatalytic performance

et al. 2019

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Further applications of photocatalysis were limited by the high recombination probability of photo-induced electron–hole pairs in traditional titanium dioxide nanoparticles (TiO2 NPs). Herein, we modified them with rare earth metal via a facile sol–gel method, using tetrabutyl titanate as a precursor and terbium (III) nitrate hexahydrate as terbium (Tb) source. The resulting samples with different Tb doping amounts (from 0 to 2%) have been characterized by X-ray diffraction, UV–visible diffuse reflectance spectroscopy, X-ray photo-electron spectroscopy and a scanning electron microscope. The photocatalytic performance of Tb-doped TiO2 was evaluated by the degradation of methylene blue. The effects of Tb doping amount and initial pH value of solution were investigated in detail. The composite with Tb doping amount of 1.0 wt% showed the highest photocatalytic performance. It exhibited approximately three times enhancement in photocatalytic activity with a reaction rate constant of 0.2314 h−1 when compared with that of commercial P25 (0.0827 h−1). In addition, it presented low toxicity on zebrafishes with 96 h-LC50 of 23.2 mg l−1, and has been proved to be reusable for at least four cycles without significant loss of photocatalytic activity. A probable photocatalytic mechanism of Tb-doped TiO2 was proposed according to the active species trapping experiments. The high photocatalytic performance, excellent reusability and low toxicity of Tb-doped TiO2 indicated that it is a promising candidate material in the future treatment of dye wastewater.

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Section: Resultsmentioning

confidence: 99%

Rapid preparation of terbium-doped titanium dioxide nanoparticles and their enhanced photocatalytic performance

et al. 2019

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“…Four S 2p binding energies appeared on WS x /TiO 2 at 169.0, 164.3, 163.5, and 162.0 eV (Figure 3d) and were assigned to SO 4 2− , S 0 , S 2 2− , and S 2− , respectively. 18,33 Meanwhile, the Ti 2p binding energies at 462.4 and 456.1 eV corresponding to Ti−S cannot be observed in Figure S2a in the SI. 34 These suggest that S 2 2− and S 2− on WS x /TiO 2 were not bonded with Ti 4+ , and they were bonded to W 6+ .…”

Section: Industrial and Engineeringmentioning

confidence: 95%

Novel Synergetic Effect of Fe and W in FeWS_x/TiO₂ on Capturing High Concentrations of Gaseous Hg⁰ from Smelting Flue Gas: Adsorption Kinetics and Structure–Activity Relationship

Wang

Zhang

et al. 2020

Ind. Eng. Chem. Res.

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In this work, a regenerable sorbent FeWS x /TiO2 was used to reclaim gaseous Hg0 in smelting flue gas for centralized control. FeWS x /TiO2 exhibited excellent ability to adsorb Hg0, with the adsorption rate of 25.0 μg g–1 min–1. There was a novel synergetic effect of Fe and W in FeWS x /TiO2 for Hg0 adsorption, and the rate of Hg0 adsorption onto FeWS x /TiO2 was generally greater than the total of those onto FeS x /TiO2 and WS x /TiO2. The structure–activity relationship of FeWS x /TiO2 for Hg0 capture was discovered according to the kinetic analysis. FeWS x /TiO2’s capacity for Hg0 adsorption was approximately dependent on the number of S2 2– on the surface. Meanwhile, the rate of adsorption of Hg0 onto FeWS x /TiO2 was proportional to the product of the number of S2 2– on the surface and the number of surface adsorption sites for the physical adsorption of gaseous Hg0. Although S2 2– on FeS x /TiO2 did not increase obviously after W incorporation, the adsorption sites on FeS x /TiO2 obviously increased due to the appearance of WS3. Therefore, the rate of adsorption of Hg0 onto FeWS x /TiO2 was 1.8–2.3 times that on FeS x /TiO2.

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“…The second type is a nonselective adsorption point, such as unsaturated coordination sites and lattice defects. 61 3.3.2. Intraparticle Diffusion Kinetic Model.…”

Section: Resultsmentioning

confidence: 99%

“…Because O* and Cl – have a massive affinity for Hg 0 .The selective adsorption points are multiplied by introducing HCl, NO, and SO 2 under O 2 /CO 2 combustion. The second type is a nonselective adsorption point, such as unsaturated coordination sites and lattice defects …”

Section: Resultsmentioning

confidence: 99%

Experimental and Kinetic Analysis of H₂O on Hg⁰ Removal by Sorbent Traps in Oxy-combustion Atmosphere

Wang

Shen

et al. 2021

Ind. Eng. Chem. Res.

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Oxy-combustion technology is under development for CO2 capture. H2O could influence the Hg0 removal by sorbent traps in an oxy-combustion atmosphere. A study of the effects of H2O on Hg0 removal by biomass char under oxy-combustion conditions is presented in this paper. The kinetic model analysis was conducted to study the adsorption process of Hg0, which included a pseudo-first-order kinetic model, a pseudo-second-order kinetic model, and intraparticle diffusion kinetic model. Experimental results showed that a low-level of H2O had a promoting effect on the adsorption of Hg0, and high-level of H2O had an inhibiting effect. A high concentration of H2O would form a water film on the surface of sorbent traps to hinder the removal of external mass transfer on Hg0. Although the adsorption rate of Hg0 depended both on external mass transfer and intraparticle diffusion, external mass transfer was a more important controlling factor. It was found that physical adsorption was one of the main forms of Hg0 removal on the surface of sorbent traps, owing to the large specific surface area and good pore structure of the modified corn straw char. The removal of Hg0 was mainly attributed to capture by physical adsorption and the formation of HgO by chemisorption.

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Outstanding Performance of Recyclable Amorphous MoS₃ Supported on TiO₂ for Capturing High Concentrations of Gaseous Elemental Mercury: Mechanism, Kinetics, and Application

Cited by 99 publications

References 49 publications

Rapid preparation of terbium-doped titanium dioxide nanoparticles and their enhanced photocatalytic performance

Rapid preparation of terbium-doped titanium dioxide nanoparticles and their enhanced photocatalytic performance

Novel Synergetic Effect of Fe and W in FeWS_x/TiO₂ on Capturing High Concentrations of Gaseous Hg⁰ from Smelting Flue Gas: Adsorption Kinetics and Structure–Activity Relationship

Experimental and Kinetic Analysis of H₂O on Hg⁰ Removal by Sorbent Traps in Oxy-combustion Atmosphere

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Outstanding Performance of Recyclable Amorphous MoS3 Supported on TiO2 for Capturing High Concentrations of Gaseous Elemental Mercury: Mechanism, Kinetics, and Application

Cited by 99 publications

References 49 publications

Rapid preparation of terbium-doped titanium dioxide nanoparticles and their enhanced photocatalytic performance

Rapid preparation of terbium-doped titanium dioxide nanoparticles and their enhanced photocatalytic performance

Novel Synergetic Effect of Fe and W in FeWSx/TiO2 on Capturing High Concentrations of Gaseous Hg0 from Smelting Flue Gas: Adsorption Kinetics and Structure–Activity Relationship

Experimental and Kinetic Analysis of H2O on Hg0 Removal by Sorbent Traps in Oxy-combustion Atmosphere

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Outstanding Performance of Recyclable Amorphous MoS₃ Supported on TiO₂ for Capturing High Concentrations of Gaseous Elemental Mercury: Mechanism, Kinetics, and Application

Novel Synergetic Effect of Fe and W in FeWS_x/TiO₂ on Capturing High Concentrations of Gaseous Hg⁰ from Smelting Flue Gas: Adsorption Kinetics and Structure–Activity Relationship

Experimental and Kinetic Analysis of H₂O on Hg⁰ Removal by Sorbent Traps in Oxy-combustion Atmosphere