Electrostatic self-assembly of a AgI/Bi2Ga4O9 p–n junction photocatalyst for boosting superoxide radical generation

Liu, Jin; Zhang, Xingcai; Zhong, Qian; Li, Jun; Wu, Hong-Zhang; Zhang, Bo; Jin, Lin; Tao, Hua Bing; Liu, Bin

doi:10.1039/c9ta13724f

Cited by 93 publications

(17 citation statements)

References 51 publications

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“…Today, the world is facing a lot of water shortage and pollution. − With the advancement of science and technology, demands have increased for dyes and pigmentation; nonetheless, numerous waste dyes used in various industries are entering rivers and seas as wastewaters. − A large amount of industrial wastewaters is colored because a variety of industries including cosmetics, food, coloring, and textiles dispose their waste colors into water. − Many industrial dyes are not directly toxic, but they produce carcinogenic compounds, such as aromatic amines, during anaerobic degradation. − Although most of these materials are naturally decomposed, the importance of using efficient and economical methods to eliminate contaminants is evident. − …”

Section: Introductionmentioning

confidence: 99%

ZnO Photocatalyst Revisited: Effective Photocatalytic Degradation of Emerging Contaminants Using S-Doped ZnO Nanoparticles under Visible Light Radiation

Mirzaeifard

Shariatinia‬

Jourshabani

et al. 2020

Ind. Eng. Chem. Res.

262

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Zinc oxide (ZnO) nanoparticles were synthesized by the hydrothermal method and incorporated with diverse amounts of the nonmetal element sulfur (0.5, 0.8, 1.1, 1.3, 2.1, 2.5, 3.2, 6.8, 7.8, 11.9, 12.3, and 17.4 wt %). The physicochemical properties of all nanoparticles were investigated by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, and N2 adsorption/desorption isotherms, as well as Fourier transform infrared, diffuse reflectance, ultraviolet–visible absorption, and photoluminescence (PL) emission spectra. Pure ZnO and 12 S-containing ZnO nanoparticles were examined as photocatalysts for the degradation of the rhodamine B (RhB) contaminant. Among the S-containing samples, 0.10 g of the sample doped with 0.5 wt % S could degrade 100% of RhB (5 ppm) at pH = 5 in 90 min. It was also found that the 0.8 and 1.1 wt % S-doped ZnO samples could degrade 99 and 97% of RhB in 150 min, respectively. The photocatalytic property of the 0.5 wt % S-doped ZnO was improved by adding a small quantity of ammonium persulfate (0.005 g), so that it could degrade 100% of RhB in 60 min but 10 ppm RhB in 210 min. Moreover, the pure ZnO and the optimal 0.5 wt % S-doped ZnO photocatalysts displayed 2 and 53% degradation of the phenol pollutant in 180 min at pH = 5, respectively. The reusability of the 0.5 wt % S-doped ZnO optimal photocatalyst was tested under optimized conditions (catalyst dosage = 0.10 g, pH = 5, and RhB concentration = 5 ppm) for the RhB degradation exhibiting the degradation efficiency was slightly decreased from 100 to 92% after five successive reactions. Thus, such a photocatalyst could be used as a promising material for application in industrial wastewater treatment processes.

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Section: Introductionmentioning

confidence: 99%

ZnO Photocatalyst Revisited: Effective Photocatalytic Degradation of Emerging Contaminants Using S-Doped ZnO Nanoparticles under Visible Light Radiation

Mirzaeifard

Shariatinia‬

Jourshabani

et al. 2020

Ind. Eng. Chem. Res.

262

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“…Furthermore, the color filled map of electron localization function (ELF) confirmed the specific binding state and intimate interface contact in PDI/BiOI heterojunction (Figure S8A,B, Supporting Information). [ 22 ] Moreover, by simply adjusting numbers of centrifugation‐assisted SILAR cycles, the coverage density and loading amount of the BiOI nanoveils on the PDI nanorods surface could be easily controlled, and the PB‐1 and PB‐5 heterojunction were also systematically characterized (Figures S9 and S10 and Table S2, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Diffusion‐Controlled Z‐Scheme‐Steered Charge Separation across PDI/BiOI Heterointerface for Ultraviolet, Visible, and Infrared Light‐Driven Photocatalysis

Ben

Liu

et al. 2021

Adv Funct Materials

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Constructing heterojunctions is an efficient approach for enhancing charge separation to optimize photoreactivity. Although the aligned built‐in electric fields across the heterointerface are generally considered as the main driving force for charge separation, diffusion‐controlled charge separation also happens, which is poorly investigated in photocatalytic heterojunctions. Here, a perylene‐3,4,9,10‐tetracarboxylic diimide (PDI)–bismuth oxyiodide (BiOI) heterojunction is elaborately fabricated by in situ successive ion layer adsorption and reaction (SILAR) methods. Utilizing Kelvin probe force microscopy (KPFM), the local separation of photogenerated charge carriers across the heterointerface is directly mapped, which obeys a Z‐scheme mechanism. Experimental results and theoretical simulations reveal that the differences of electron densities between PDI and BiOI enable a diffusion‐controlled charge separation process, which overwhelm that of built‐in electric fields across heterointerfaces. Benefiting from the effective charge separation driven by a diffusion‐controlled driving force, this PDI/BiOI heterojunction exhibits superior photocatalytic activities even under infrared (IR)‐light irradiation. These findings highlight the importance of diffusion‐controlled charge separation, and also offer useful roadmaps for the design of high‐performance heterojunction photocatalysts for down‐to‐earth applications.

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“…[ 48 ] Unexpectedly, the degradation rate of RhB was slightly inhibited in the presence of either TBA or EtOH, indicating that the contributions of SO 4 · − and ·OH to RhB degradation in the AgFeO 2 @CaCO 3 /PMS system were limited. NaN 3 and p ‐benzoquinone ( p ‐BQ) are regarded as effective quenching agents of 1 O 2 and O 2 · − , [ 49,50 ] respectively. As shown in Figure a, the degradation of RhB was almost entirely suppressed when a small amount of NaN 3 (10 mM) was added to the AgFeO 2 @CaCO 3 /PMS system, and the addition of p ‐BQ also reduced the degradation rate of RhB, albeit to a lesser degree (62.5%).…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of AgFeO₂‐Decorated CaCO₃ with Enhanced Catalytic Activity in Activation of Peroxymonosulfate for Efficient Degradation of Organic Pollutants

Guo

Liu

You

et al. 2021

Adv Energy and Sustain Res

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The development of green and sustainable technologies for wastewater treatment is highly desirable but remains challenging. Herein, a self‐assembly strategy to stabilize AgFeO2 on the surface of CaCO3 (AgFeO2@CaCO3) is demonstrated. This structure is discovered to significantly prohibit the agglomeration of AgFeO2 nanoparticles and strengthen the interaction between AgFeO2 and CaCO3. When utilized in advanced oxidation processes (AOPs), AgFeO2@CaCO3 exhibits excellent catalytic performance in activating peroxymonosulfate (PMS) to degrade multiple organic pollutants. For example, complete Rhodamine B (RhB) decomposition can be achieved by AgFeO2@CaCO3 in the presence of PMS at a degradation rate of 0.312 min−1, which is 44.6 times that of bare AgFeO2. In addition, AgFeO2@CaCO3 demonstrates excellent stability, recyclability, general applicability, and strong resistance to the solution pH. 1O2 and O2·− are the predominant reactive oxygen species in RhB degradation. The rapid RhB degradation can be attributed to the mesoporous structure and high specific surface area of AgFeO2@CaCO3, the cycling of Fe(III)/Fe(II) and Ag(I)/Ag(0), and the presence of hydroxyl groups that facilities PMS activation, which is validated by density functional theory calculations. This study provides a feasible and scalable strategy to synthesize green and recyclable heterogeneous catalysts for wastewater remediation via PMS‐based AOPs.

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Electrostatic self-assembly of a AgI/Bi₂Ga₄O₉ p–n junction photocatalyst for boosting superoxide radical generation

Abstract: A novel AgI/Bi2Ga4O9 p–n junction photocatalyst was synthesized by an electrostatic self-assembly approach. Characterization and DFT calculations show that the formation of the p–n junction greatly boosts the generation of superoxide radicals.

Cited by 93 publications

References 51 publications

ZnO Photocatalyst Revisited: Effective Photocatalytic Degradation of Emerging Contaminants Using S-Doped ZnO Nanoparticles under Visible Light Radiation

ZnO Photocatalyst Revisited: Effective Photocatalytic Degradation of Emerging Contaminants Using S-Doped ZnO Nanoparticles under Visible Light Radiation

Diffusion‐Controlled Z‐Scheme‐Steered Charge Separation across PDI/BiOI Heterointerface for Ultraviolet, Visible, and Infrared Light‐Driven Photocatalysis

Facile Synthesis of AgFeO₂‐Decorated CaCO₃ with Enhanced Catalytic Activity in Activation of Peroxymonosulfate for Efficient Degradation of Organic Pollutants

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Electrostatic self-assembly of a AgI/Bi2Ga4O9 p–n junction photocatalyst for boosting superoxide radical generation

Abstract: A novel AgI/Bi2Ga4O9 p–n junction photocatalyst was synthesized by an electrostatic self-assembly approach. Characterization and DFT calculations show that the formation of the p–n junction greatly boosts the generation of superoxide radicals.

Cited by 93 publications

References 51 publications

ZnO Photocatalyst Revisited: Effective Photocatalytic Degradation of Emerging Contaminants Using S-Doped ZnO Nanoparticles under Visible Light Radiation

ZnO Photocatalyst Revisited: Effective Photocatalytic Degradation of Emerging Contaminants Using S-Doped ZnO Nanoparticles under Visible Light Radiation

Diffusion‐Controlled Z‐Scheme‐Steered Charge Separation across PDI/BiOI Heterointerface for Ultraviolet, Visible, and Infrared Light‐Driven Photocatalysis

Facile Synthesis of AgFeO2‐Decorated CaCO3 with Enhanced Catalytic Activity in Activation of Peroxymonosulfate for Efficient Degradation of Organic Pollutants

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Electrostatic self-assembly of a AgI/Bi₂Ga₄O₉ p–n junction photocatalyst for boosting superoxide radical generation

Facile Synthesis of AgFeO₂‐Decorated CaCO₃ with Enhanced Catalytic Activity in Activation of Peroxymonosulfate for Efficient Degradation of Organic Pollutants