A new application of high-efficient silver salts-based photocatalyst under natural indoor weak light for wastewater cleaning

Xia, Hua; Teng, Fei; Zhao, Yunxuan; Xu, Juan; Xu, Chuangye; Yang, Yang; Zhang, Qiqi; Paul, Shashi; Zhang, Yi; Chen, Mindong; Zhao, Xudong

doi:10.1016/j.watres.2015.06.018

Cited by 43 publications

(10 citation statements)

References 31 publications

(39 reference statements)

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“…We assume that the surface charge properties of adsorbent and the molecule structure of dye may affect the adsorption behavior. Thus, zeta potential measurements have been done to investigate the surface charge properties of the samples, which are presented in Table . The results demonstrate that the surfaces of 20 wt% core@shell sample, MoS 2 and Na 0.5 Ce 0.5 MoO 4 are with negative charge, which are in accordance with our assumption.…”

Section: Resultsmentioning

confidence: 99%

One‐pot Synthesis of Novel Composite@Composite‐Typed Core@Shell Nanostructures and the Adsorption Property for Dye Wastewater

Yang

Teng

2017

ChemistrySelect

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In this work, the novel composite@composite-type core@shell nanostructures, i.e. Na 0.5 Ce 0.5 MoO 4 -MoS 2 @Na 0.5 Ce 0.5 MoO 4 -MoS 2 , have been synthesized via one-pot hydrothermal method. The core and shell are both composed of Na 0.5 Ce 0.5 MoO 4 -MoS 2 but with different mass ratios of Na 0.5 Ce 0.5 MoO 4 to MoS 2 , which are obviously different from the commonly reported core@shell nanostructures with the single-component core and the singlecomponent shell. Besides, it is found that for single dye solution, 20 wt% core@shell sample has an significantly improved adsorption capability for rhodamine B (RhB), but a poor adsorption capability for methyl orange (MO) dye. In RhB-MO mixture solution, the adsorption of RhB has been greatly promoted by MO. In addition, Cr(VI) ion has significantly decreased the adsorption capacity of RhB; meanwhile, K(I) ion can slightly promote MO adsorption. This work provides a simple preparation approach to the new composite-type core@shell nanostructures, and can help us to understand the adsorption processes for practical wastewaters.

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Section: Resultsmentioning

confidence: 99%

One‐pot Synthesis of Novel Composite@Composite‐Typed Core@Shell Nanostructures and the Adsorption Property for Dye Wastewater

Yang

Teng

2017

ChemistrySelect

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“…Silver phosphate (Ag 3 PO 4 ) is a particular semiconductor material featuring a typical band gap of ∼2.42 eV, making it promising as a photocatalyst under natural light. , By virtue of its highly dispersive band structure at the conduction band minimum, Ag 3 PO 4 shows higher electron transfer efficiency than many other semiconductor catalysts. − Thus, Ag 3 PO 4 is one of the most efficient photocatalysts currently. − Nevertheless, there are still some problems that need to be overcome in the current situation. For example, the stability of Ag + has troubled people for a long time, as Ag + tends to transform into elemental silver (Ag 0 ), which severely affects the catalytic performance of Ag 3 PO 4 . , In addition, although Ag 3 PO 4 has been used as a popular catalyst, most has been ineligible for natural light catalysis as the light intensity is lower than 500 lx indoor, making Ag 3 PO 4 difficult to be applied to practical water remediation.…”

Section: Introductionmentioning

confidence: 99%

Antioil Ag₃PO₄ Nanoparticle/Polydopamine/Al₂O₃ Sandwich Structure for Complex Wastewater Treatment: Dynamic Catalysis under Natural Light

Zhang

Liu

et al. 2018

ACS Sustainable Chem. Eng.

151

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We have successfully fabricated sandwich structural Ag3PO4 nanoparticle/polydopamine/Al2O3 porous small balls (APPAOs) by a facile homogeneous precipitation method, which exhibit a natural light catalysis capacity to degrade different kinds of water pollutants including industrial dyes and agricultural pesticides. The porous Al2O3 provides the substrate to form the Ag3PO4/Al2O3 heterojunction, as well as increases the specific surface area (SSA) of the Ag3PO4 nanoparticle, thus greatly enhancing the photocatalytic capacity. Polydopamine (PDA) plays the role of adhesive between Al2O3 substrate and Ag3PO4 nanoparticle, aiming to stabilize the synthesized APPAO catalyst. A part of Ag3PO4 is reduced by PDA and transformed into a Ag nanosphere, which further increases SSA and enhances the catalytic ability of the material by the plasmonic effect. Further study shows that there is a dynamic process between catalysis and adsorption/desorption equilibrium; i.e., with the catalysis going ahead, the adsorption/desorption equilibrium accordingly shifts thus thoroughly treating the pollutants. In addition, the superhydrophilic surface provides the APPAO with an excellent antioil property, which greatly reduces secondary pollution, and the small ball structure makes the material easy to use and recycle. Because of its excellent reusability, mild catalytic conditions, and ease of use, the APPAO has great potential to be used in the field of low-cost practical wastewater treatment.

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“…Therefore, chloride ions were chosen in this study to help understand the effect of anionic scavengers on photocatalytic oxidation. Another factor that can affect photocatalytic oxidation is light intensity, since insufficient light energy results in limited generation of electron-hole pairs (Giannakis et al, 2016;Hua et al, 2015). This work aimed to enhance the photocatalytic degradation of MO by TiO 2 -crystallinity transformation.…”

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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A new application of high-efficient silver salts-based photocatalyst under natural indoor weak light for wastewater cleaning

Cited by 43 publications

References 31 publications

One‐pot Synthesis of Novel Composite@Composite‐Typed Core@Shell Nanostructures and the Adsorption Property for Dye Wastewater

One‐pot Synthesis of Novel Composite@Composite‐Typed Core@Shell Nanostructures and the Adsorption Property for Dye Wastewater

Antioil Ag₃PO₄ Nanoparticle/Polydopamine/Al₂O₃ Sandwich Structure for Complex Wastewater Treatment: Dynamic Catalysis under Natural Light

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

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A new application of high-efficient silver salts-based photocatalyst under natural indoor weak light for wastewater cleaning

Cited by 43 publications

References 31 publications

One‐pot Synthesis of Novel Composite@Composite‐Typed Core@Shell Nanostructures and the Adsorption Property for Dye Wastewater

One‐pot Synthesis of Novel Composite@Composite‐Typed Core@Shell Nanostructures and the Adsorption Property for Dye Wastewater

Antioil Ag3PO4 Nanoparticle/Polydopamine/Al2O3 Sandwich Structure for Complex Wastewater Treatment: Dynamic Catalysis under Natural Light

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

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Antioil Ag₃PO₄ Nanoparticle/Polydopamine/Al₂O₃ Sandwich Structure for Complex Wastewater Treatment: Dynamic Catalysis under Natural Light