In-situ construction of 3D nanoflower-like BiOI/Bi2SiO5 heterojunctions with enhanced photocatalytic performance for removal of decontaminants originated from a step-scheme mechanism

Dou, Lin; Zhong, Jianxin; Li, Jianzhang; Pandian, Rathiesh; Burda, Clemens

doi:10.1016/j.apsusc.2020.148883

Cited by 48 publications

(12 citation statements)

References 75 publications

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“…The EPR technique is an effective method to certify oxygen vacancies in nanomaterials. [35] As can be seen from Figure 6c, an obvious EPR signal of BSO-10 and BSO-13 samples is observed at g ¼ 2.003, in good agreement with typical oxygen vacancy signals. [28] The concentration of oxygen vacancies for Bi/Bi 2 SiO 5 is significantly higher than one of Bi 2 SiO 5 , which indicates that the abundance of oxygen vacancy contributes to enhance the separation and utilization efficiency of photogenerated carriers (consistent with XPS result).…”

Section: Resultssupporting

confidence: 70%

“…For Figure 2c and S3c, Supporting Information, the two peaks located at 529.8 and 529.9 eV are attributed to Bi-O binding energy, and the two peaks of 531.6 and 531.7 eV correspond to the absorbed surface oxygen. [30,35] More importantly, the two peaks at 530.70 and 530.80 eV match well with the defect oxygen, [19,36] and the content of oxygen vacancy (O V ) of BSO-13 sample is much more than one of BSO-10. There are two peaks observed at 101.98 eV (Figure S3d, Supporting Information) and 101.88 eV (Figure 2d), which should be assigned to the Si 4þ oxidation state existing in the form of SiO 3 2À .…”

Section: Resultsmentioning

confidence: 79%

“…[ 18,19 ] Besides, as can be seen from Figure 3f, with the increase of pH value to 13, the obvious lattice spacings of 0.194 and 0.270 nm belong to the (022) and (020) planes of Bi 2 SiO 5 , respectively. [ 35,39 ] The analysis results imply that the plane proportion of Bi 2 SiO 5 can be regulated and controlled by the variation of OH − . As shown in Figure 3g, it can be clearly observed that the Bi nanoparticles is together compactly with Bi 2 SiO 5 , which are the same as the analysis findings of SEM image (Figure 3d).…”

Section: Resultsmentioning

confidence: 98%

“…There are two peaks observed at 101.98 eV (Figure S3d, Supporting Information) and 101.88 eV (Figure 2d), which should be assigned to the Si 4þ oxidation state existing in the form of SiO 3 2À . [14,35] Finally, there is an important phenomenon about the lower direction shift of binding energies for Bi 4f, Si 2p, and O 1s, reflecting the interaction of metallic Bi with Bi 2 SiO 5 in the nanocomposites. [37,38] Figure 3 provides the structural morphologies of BSO-10 and BSO-13 samples.…”

Section: Resultsmentioning

confidence: 99%

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In Situ Hydrothermal Synthesis of Metallic Bi Self‐Deposited Bi₂SiO₅ with Enhanced Photocatalytic CO₂ Reduction Performance

Guan

Zhang

et al. 2022

Solar RRL

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Metal‐modified nanomaterial has been regarded as an effective way to improve its photocatalytic CO2 reduction performance. Herein, metallic Bi self‐doped Bi2SiO5 composites are successfully in situ synthesized via a simple OH−‐assisted hydrothermal controllable route. The experimental results reveal that 2 mol L−1 NaOH plays two roles in the formation of Bi/Bi2SiO5 composites: 1) increasing the specific surface area through cracking the flower‐like microspheres of Bi2SiO5 with the increase of pH value, 57.92 m2 g−1 (pH = 13), 1.54 times as large as pure Bi2SiO5 (pH = 10); 2) dissolving out the different metallic Bi contents by adjusting the volume of 2 mol L−1 NaOH, achieving the optimum metallic Bi content of about 9.01%. Additionally, combined with experimental data and physicochemical characteristics, the novel mechanism of metallic Bi self‐doped bismuth silicate composites is investigated, and an interesting linear relationship between the metallic Bi with the volume of 2 mol L−1 NaOH is confirmed. The Bi/Bi2SiO5 (pH = 13) sample exhibits the highest CO2 photoreduction activity and stability to CO, more than 2.2 times that of pure Bi2SiO5 (pH = 10), which should be mainly attributed to the surface plasmonic resonance effect of metallic Bi, the strong light absorption ability, and the interfacial interaction between metallic Bi and Bi2SiO5.

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Section: Resultssupporting

confidence: 70%

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

In Situ Hydrothermal Synthesis of Metallic Bi Self‐Deposited Bi₂SiO₅ with Enhanced Photocatalytic CO₂ Reduction Performance

Guan

Zhang

et al. 2022

Solar RRL

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“…Huang et al (2020) reported that the catalytic ability of copper oxide depended on not only the dimension, but also on crystalline factors, such as the exposed facets when degrading 2,4-dichlorophenol by Ultrafast O 2 activation using copper oxide. Dou et al (2021) constructed novel 3D nanoflower-like BiOI/Bi 2 SiO 5 heterojunctions using ionic liquid 1-butyl-3-methylimidazolium iodine ([PrMIm]I) that served as a reactant and a soft template. The results showed that the product holds high photocatalytic performance toward abatement of methyl orange (MO), phenol and Cr(VI) under sunlight irradiation.…”

Section: Introductionmentioning

confidence: 99%

Diclofenac degradation based on shape-controlled cuprous oxide nanoparticles prepared by using ionic liquid

Luo

2021

Water Science and Technology

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Persulfate oxidation technology is widely used in wastewater treatment, but there are still many disadvantages, such as high energy consumption, side reaction and narrow pH applicability. Copper oxides can activate persulfate steadily with higher efficiency. In this paper, a novel preparation method of shape-controlled cuprous oxide (Cu2O) nanoparticles featured with high catalytic performance was explored. It was found that adding ionic liquid 1-butyl-3-methylimidazolium bromide ([BMIM]Br) during preparation of Cu2O can improve the degradation rate of diclofenac (DCF). Cu2O nanoparticles possess good stability in consecutive cycling tests, which was confirmed by X-ray photoelectron spectroscopy. The possible mechanism of Cu2O activating persulfate at different initial pH conditions was discussed based on electron paramagnetic resonance spin-trapping experiment. It was found that DCF was efficiently degraded in the Cu2O/peroxydisulfate (PDS) system within a broad pH range from 5 to 11. It proved via a quenching experiment that the activation process of PDS mainly occurs on the surface layer of Cu2O nanoparticles. As a result, shape-controlled Cu2O nanoparticles prepared by ionic liquid are expected to be used for in situ chemical oxidation, which is an effective oxidation processes to degrade DCF remaining in surface water and ground water.

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Emerging S‐Scheme Photocatalyst

et al. 2022

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strategies in addressing the low-efficiency issue will be discussed.Photocatalysis mainly deals with electron and energy transfer processes. Prior to the discussion, it is necessary to learn the basic behaviors of the excited state of a molecule, which can enhance the understanding on electron transfer and energy dissipation in semiconductors. Generally, the first process is the absorption of a photon by a molecule (in the time scale of femtoseconds (fs)), where the ground state is lifted energetically to the first excited singlet state. Subsequently, a simplified Jablonski diagram is reconsidered, [2] as shown in Figure 1. The charge carriers generated in one molecule experience several possible processes with varying possibilities: [3] a) Vibrational relaxation (VR): it is relaxation of excited state electrons to the lowest energy level which generally occurs in picoseconds (ps). It can happen from each excited state to each non-excited state including the ground state. This VR results in loss of energy because excessive vibrational energy is converted into heat. b) Fluorescence: After the relaxation to the lowest vibrational level, the excited molecule can finally get back to the ground state by emitting a photon. This is named as fluorescence, which occurs in a relatively long time, ranging from ps to nanoseconds (ns). c) Internal conversion (IC): it is a crossover process in which an electronically excited molecule moves from one electronic state to a lower one of the same multiplicity (singlet-to-singlet or triplet-to-triplet states) and can be measured from ps to fs. [4] d) Intersystem crossing (ISC): A transition from one electronic state to another one with a different spin multiplicity is called ISC. e) Phosphorescence: After the molecule transitions through ISC to the triplet state, further deactivation occurs through phosphorescence. And its lifetime ranges from one millisecond (ms) to hundreds of seconds. Apart from these, other processes such as vibrational cooling are also possible, which are not illustrated here.The above-mentioned processes in a single molecule can be used as a reference when discussing a semiconductor photocatalyst. Analogously, electrons are excited to the conduction band (CB) after absorption. Afterward, they will undergo several decay processes or they will finally migrate to the surface and participate in a specific redox reaction. These decay processes are briefly introduced here by comparing with those in a molecule (Figure 1): a) Relaxation of electrons to the lowest CB energy states. b) Radiative recombination of electrons and holes via emitted as fluorescence; c) Non-radiative decay, also referred to as Photocatalysis is a green technology to use ubiquitous and intermittent sunlight. The emerging S-scheme heterojunction has demonstrated its superiority in photocatalysis. This article covers the state-of-the-art progress and provides new insights into its general designing criteria. It starts with the challenges confronted by single photocatalyst from the perspective of...

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In-situ construction of 3D nanoflower-like BiOI/Bi2SiO5 heterojunctions with enhanced photocatalytic performance for removal of decontaminants originated from a step-scheme mechanism

Cited by 48 publications

References 75 publications

In Situ Hydrothermal Synthesis of Metallic Bi Self‐Deposited Bi₂SiO₅ with Enhanced Photocatalytic CO₂ Reduction Performance

In Situ Hydrothermal Synthesis of Metallic Bi Self‐Deposited Bi₂SiO₅ with Enhanced Photocatalytic CO₂ Reduction Performance

Diclofenac degradation based on shape-controlled cuprous oxide nanoparticles prepared by using ionic liquid

Emerging S‐Scheme Photocatalyst

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In-situ construction of 3D nanoflower-like BiOI/Bi2SiO5 heterojunctions with enhanced photocatalytic performance for removal of decontaminants originated from a step-scheme mechanism

Cited by 48 publications

References 75 publications

In Situ Hydrothermal Synthesis of Metallic Bi Self‐Deposited Bi2SiO5 with Enhanced Photocatalytic CO2 Reduction Performance

In Situ Hydrothermal Synthesis of Metallic Bi Self‐Deposited Bi2SiO5 with Enhanced Photocatalytic CO2 Reduction Performance

Diclofenac degradation based on shape-controlled cuprous oxide nanoparticles prepared by using ionic liquid

Emerging S‐Scheme Photocatalyst

Contact Info

Product

Resources

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In Situ Hydrothermal Synthesis of Metallic Bi Self‐Deposited Bi₂SiO₅ with Enhanced Photocatalytic CO₂ Reduction Performance

In Situ Hydrothermal Synthesis of Metallic Bi Self‐Deposited Bi₂SiO₅ with Enhanced Photocatalytic CO₂ Reduction Performance