The interplay of sulfur doping and surface hydroxyl in band gap engineering: Mesoporous sulfur-doped TiO2 coupled with magnetite as a recyclable, efficient, visible light active photocatalyst for water purification

Yan, Xiaoqing; Yuan, Kun; Lu, Nan; Xu, Huidong; Zhang, Siyu; Takeuchi, Nobuyuki; Kobayashi, Hisayoshi; Li, Renhong

doi:10.1016/j.apcatb.2017.06.022

Cited by 119 publications

(38 citation statements)

References 55 publications

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“…After being recycled three times, the total removal ratio with Cu‐S@ZIF‐8/RGO only declined by 8.9%, demonstrating the considerable stability of the photocatalyst. Besides that, 50 μ m mordant anions such as NaCl, Na 2 CO 3 , NaNO 3 , Na 2 SO 4 and NaH 2 PO 4 were used in the dyeing process, which will impose a negative effect on the photocatalyst . In different systems, the five kinds of anions were added together or separately to verify the stability of Cu‐S@ZIF‐8/RGO under simulated sunlight, and the total anion concentration was always kept at 50 μ m .…”

Section: Resultsmentioning

confidence: 99%

Preparation of Cu nanoparticle‐doped ZIF‐8/RGO composites for effective photodegradation of organic pollutant

Wang

Kang

Shang

et al. 2019

Applied Organom Chemis

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Cu nanoparticle-connected ZIF-8/reduced graphite oxide (RGO) composite was successfully prepared through a facile hydrothermal reaction using sulfate in this paper. The crossover mechanism of metal nanoparticles loading and RGO decoration to enhance the photocatalytic efficiency of pristine ZIF-8 was studied. The results showed that the prepared Cu-S@ZIF-8/RGO has a strong ability to take advantage of sunlight, indicating an appreciable application prospect. RGO can act as a base to support the whole structure and serve as an electron sink to accept photoexcited electrons, realizing the formation of reactive oxygen species (ROS) and inhibition of electron-hole pair recombination. Cu nanoparticles act as connectors between ZIF-8 and RGO to transfer electrons and realize the formation of partial ROS on its surface. The doped sulfate radical can promote to extend the utilization of the wavelength range by generating surface states. Cu-S@ZIF-8/RGO showed the best photocatalytic activity in simulated sunlight for eliminating rhodamine B and 4-chlorophenol among all the prepared samples, the structure kept intact even in the presence of different kinds of anions. The crossover study of metal loading and RGO decoration can develop a new way for only UV-responsive metal-organic frameworks to remove organic contaminants under sunlight irradiation.

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Section: Resultsmentioning

confidence: 99%

Preparation of Cu nanoparticle‐doped ZIF‐8/RGO composites for effective photodegradation of organic pollutant

Wang

Kang

Shang

et al. 2019

Applied Organom Chemis

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“…Catalysts based on such systems have achieved unexpectedly good results, and many related studies have been published [11][12][13]. Currently, various photocatalysts ranging from widely used TiO 2 particles 2 of 14 to metal-sulfide [14], metal-nitride [15], and metal-tungstate [16] with a slightly smaller bandgap have been studied.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production Improvement on Water Decomposition Through Internal Interfacial Charge Transfer in M3(PO4)2-M2P2O7 Mixed-Phase Catalyst (M = Co, Ni, and Cu)

et al. 2019

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In this study, three types of Nasicon-type materials, Co 3 (PO 4 ) 2 -CO 2 P 2 O 7 , Ni 3 (PO 4 ) 2 -Ni 2 P 2 O 7 , and Cu 3 (PO 4 ) 2 -Cu 2 P 2 O 7 , were synthesized as mixed-phase catalysts (MPCs) for evaluating their potential as new photocatalytic candidates (called Co 3 (PO 4 ) 2 -CO 2 P 2 O 7 mpc, Ni 3 (PO 4 ) 2 -Ni 2 P 2 O 7 mpc, and Cu 3 (PO 4 ) 2 -Cu 2 P 2 O 7 mpc herein). Based on various physical properties, it was confirmed that there are two phases, M 3 (PO 4 ) 2 and M 2 P 2 O 7 , in which a similar phase equilibrium energy coexists. These colored powders showed UV and visible light responses suitable to our aim of developing 365-nm light-response photocatalysts for overall water-splitting. The photocatalytic performance of Ni 2 (PO 4 ) 3 -Ni 2 P 2 O 7 MPC showed negligible or no activity toward H 2 evolution. However, Co 2 (PO 4 ) 3 -Co 2 P 2 O 7 MPC and Cu 3 (PO 4 ) 2 -Cu 2 P 2 O 7 MPC were determined as interesting materials because of their ability to absorb visible light within a suitable band. Moreover, an internal interface charge transfer was suggested to occur that would lower the recombination rate of electrons and holes. For Cu 3 (PO 4 ) 2 -Cu 2 P 2 O 7 MPC, the charge separation between the electron and hole was advantageously achieved, a water-splitting reaction was promoted, and hydrogen generation was considerably increased. The performance of a catalyst depended on the nature of the active metal added. In addition, the performance of the catalyst was improved when electrons migrated between the inter-phases despite the lack of a heterojunction with other crystals.

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“…Titanium dioxide (TiO 2 ) has been proposed as an ideal semiconductor for the removal of recalcitrant compounds because it is chemically and biologically resistant and nontoxic, and can be simply applied (Ayati et al, 2014;Pelaez et al, 2012;Zhang, Wang, Liu, Sang, & Liu, 2017). The photocatalytic activity of TiO 2 mainly occurs on the surface of materials (Al-Hetlani, Amin, & Madkour, 2017;Yan et al, Research Article 2017). Thus, increases in interaction site area and improved surface morphology properties are believed to be the key factors for enhancing the photocatalytic degradation of recalcitrant compounds using TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Enhancing photocatalytic degradation of methyl orange by crystallinity transformation of titanium dioxide: A kinetic study

Adnan

Phattarapattamawong

2019

Water Environment Research

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This work aimed to enhance the photocatalytic degradation of methyl orange (MO) by crystallinity transformation of titanium dioxide (TiO2). In addition, the kinetic degradation of MO was determined. To transform its crystallinity, TiO2 was synthesized using a sol–gel method and calcined at between 200°C to 600°C. Calcination at a temperature of 250°C resulted in TiO2 that showed the best performance, corresponding to MO removal of 87% ± 7%. MO removal by TiO2 calcined between 250°C to 400°C was higher than for commercial TiO2 powder (Sigma‐aldrich) (62% ± 4%). TiO2 with a small crystallite size and high anatase fraction enhanced the photocatalytic degradation of MO, while the specific surface area and surface roughness seemed to play a minor role. The photocatalytic degradation of MO was NaCl‐independent, while the photocatalytic activity increased with decreased pH. Reused TiO2 showed similar photocatalytic degradation of MO compared with pristine TiO2, at 84 ± 2%. The oxidation kinetics of TiO2 calcined at 250°C were fitted to the Langmuir–Hinshelwood model (R2 = 0.9134). The kr and Ks values were 0.027 mg L−1 min−1 and 0.621 L/mg, respectively. Crystallinity transformation was a major factor in the enhancement of photocatalytic degradation of MO. Practitioner points Photocatalytic activity of TiO2 depends on calcination temperature, pH, and a number of UVC lamps. TiO2 with a small crystallite size and high anatase fraction enhanced the photocatalytic degradation of MO.

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The interplay of sulfur doping and surface hydroxyl in band gap engineering: Mesoporous sulfur-doped TiO2 coupled with magnetite as a recyclable, efficient, visible light active photocatalyst for water purification

Cited by 119 publications

References 55 publications

Preparation of Cu nanoparticle‐doped ZIF‐8/RGO composites for effective photodegradation of organic pollutant

Preparation of Cu nanoparticle‐doped ZIF‐8/RGO composites for effective photodegradation of organic pollutant

Hydrogen Production Improvement on Water Decomposition Through Internal Interfacial Charge Transfer in M3(PO4)2-M2P2O7 Mixed-Phase Catalyst (M = Co, Ni, and Cu)

Enhancing photocatalytic degradation of methyl orange by crystallinity transformation of titanium dioxide: A kinetic study

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