DYES AND PIGMENTS
·
2020
·
IF 4.613
Ding Yuan,Liying Huang,Yeping Li,Hao Wang,Xiuquan Xu,Chaobao Wang,Lei Yang
Making multiple heterojunction of photocatalysts is an effect approach to achieve high effective utilization of solar resource. A novel ternary AgI/BiOI/pg-C 3 N 4 nanocomposite was synthesized with a unique n-p-n heterojunction. In this work, an in-situ transformation method was used to fabricate AgI/BiOI/pg-C 3 N 4 heterostructure with different AgI/BiOI ratios. The photocatalytic activity of the AgI/BiOI/pg-C 3 N 4 was detected by the degradation of methylene orange (MO) and tetracycline (TC). The AgI/BiOI/pg-C 3 N 4 composites exhibited better photocatalytic activity than pg-C 3 N 4 and BiOI/pg-C 3 N 4 composite. The performance of photocatalytic antibacterial inactivation of E. coli indicated that the AgI/BiOI/pg-C 3 N 4 heterostructure is an ideal material for antibacterial applications. The ESR and trapping experiments confirmed that the degradation of organic pollution is completed through the co-operation of •O 2 − , •OH and h + . A possible mechanism of the degradation process is proposed.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Huining Zhang,Zongqian Zhang,Yuling Tang,Jianping Han,Zhiguo Wu,Zhiqiang Wei,Shaofeng Wang,Yang Cao,Seng Zhang,Yue Zhang
This study focuses on a novel ternary heterojunction catalyst for the removal of 2,4-dichlorophenol (2,4-DCP), an organic pollutant that is difficult to degrade. An efficient CuInS 2 /BiOI/Bi 2 MoO 6 ternary heterojunction photocatalyst was formed by constructing a CuInS 2 /BiOI composite layer on a Bi 2 MoO 6 substrate using an in-situ growth technique. The microstructure and photoelectric conversion properties of the catalysts were comprehensively resolved by systematic material characterization, including scanning electron microscopy (SEM) observation, X-ray photoelectron spectroscopy (XPS) analysis and photoelectrochemical testing. The experimental results showed that the optimized catalyst at a loading of 2.0 g/L exhibited excellent photocatalytic degradation efficiency against 20 mg/L concentration of 2,4-DCP at neutral pH, reaching 80.3 % degradation rate in 120 min. This high performance was mainly attributed to the enhanced charge-carrier separation mechanism at the heterojunction interface, which effectively enhanced the utilization and transfer rate of photogenerated electron-hole pairs and enhanced the photocatalytic activity of the catalyst. In addition, the study also deeply explored the conversion pathway of elemental chlorine in the photocatalytic system, elucidated the mechanism of 2,4-DCP degradation and dechlorination, and provided a theoretical basis for further improving the environmental adaptability and dechlorination efficiency of the catalyst. Overall, the CuInS 2 /BiOI/Bi 2 MoO 6 ternary heterojunction photocatalysts proposed in this study demonstrate a broad application prospect in the purification of 2,4-DCP and other organic pollutants, and open up a new way to solve the problems of industrial wastewater treatment, which is of great environmental significance and scientific value.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 54
·期 1
·598-608
·
IF 2.2
Deng Wenqiang,Liao Runhua,Liang Boyu,Du Jie,Zhang Wenbin,Fu Xin,Li Shuyao,Hong Yan,Fu Lichun
In this research, a BiOI/C 3 N 5 heterostructure was synthesized using a solvothermal technique to prevent the recombination of photoexcited electrons and holes. The morphology, structure, and mechanism of the material were investigated using x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), x-ray photoelectron spectroscopy (XPS), ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), energy-dispersive x-ray spectroscopy (EDS), electron paramagnetic resonance (EPR), and photoluminescence (PL) spectroscopy, among other tests. The photocatalytic performance of the heterostructure was evaluated through the degradation of tetracycline hydrochloride (TCH). Results showed that compared to C 3 N 5 and BiOI alone, the formation of the heterostructure significantly enhanced the photocatalytic efficiency, achieving 1.5 times the degradation efficiency of pure C 3 N 5 and twice that of BiOI. Under optimal conditions, the composite material degraded nearly 90% of TCH within 180 min, and after five cycles, it still exhibited degradation efficiency of 76.19%, demonstrating its good recyclability and stability. The main active species involved in the photocatalytic degradation of TCH were found to be superoxide radicals (•O 2 − ) and holes (h + ). This work not only provides a new approach to the design of photocatalytic degradation materials but also offers a novel method for effectively degrading organic pollutants.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 57
·45646-45653
·
IF 3.84
Suqin Liu,Huizhen Liu,Guanhua Jin,Hao Yuan
A novel flower-like MnO2/BiOI composite has been fabricated by a simple and cost-effective approach. Multiple experiments are carried out to optimize the molar ratio of MnO2/BiOI for the decomposition of methyl orange (MO) and Rhodamine B (RhB). The adsorption property of the as-prepared samples in dark conditions and the photocatalytic activity under visible light and simulated solar light irradiation are investigated in detail. When the MnO2/BiOI molar ratio is 4 : 5, the highest photocatalytic activity for degradation of MO (97.8%) and RhB (91.7%) is achieved under visible light irradiation for 40 min as well as simulated solar light irradiation (93.4% for MO and 88.2% for RhB within 40 min). The excellent photocatalytic performances are attributed to the synergistic effect of BiOI and MnO2 and the unique flower-like morphology of the MnO2/BiOI composite as verified by relative experiments.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Qianqian Ni,Xin Ke,Wenjing Qian,Zheng Yan,Jingde Luan,Wengang Liu
A single hydrothermal reaction was used to create BiOI/BiOBr composites, which demonstrated good sunlight-driven photocatalytic degradation activity of tetracycline (TC) over a broad pH range and the degradation efficiency can be stable at about 90%. Moreover,·O 2 - has been identified as the most important active ingredient in the photocatalytic system. Density functional theory (DFT) calculations were used to investigate the electron transfer mechanism of BiOX heterojunctions on a molecular scale, as well as to propose possible photocatalytic degradation mechanisms and reaction sites for tetracycline in different deprotonated forms at a wide range of pH values. The quantitative structure-activity relationship (QSAR) was also used to assess the toxicity of the intermediates. In summary, this study presents new concepts for investigating the photodegradation behavior of antibiotics throughout a wide pH range, which is predicted to be employed for surface water remediation.
研究领域:
环境科学
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材料科学
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计算化学
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Hanlin Chen,Yen-Ping Peng,Ting-Yu Chen,Ku-Fan Chen,Ken-Lin Chang,Zhi Dang,Gui-Ning Lu,Hongping He
This study employed BiOI-deposited TiO 2 nanotube arrays (BiOI-TNTAs) electrode in a photoelectrochemical (PEC) system to oxidize Ibuprofen and generate hydrogen in the anodic and cathodic chamber, respectively. FESEM results revealed the diameter of TiO 2 nanotubes was 90–110 nm. According to the XRD analysis, the BiOI-TNTAs were dominated by the anatase phase and tetragonal structure of BiOI. XPS results confirmed the coexistence of BiOI in the BiOI-TNTAs associated with Bi (33.76%) and I (8.81%). UV–vis absorption spectra illustrated BiOI-TNTAs exhibit strong absorptions in the visible light region. The PEC method showed the best degradation efficiency for Ibuprofen is a rate constant of 3.21 × 10 −2 min −1 . The results of the Nyquist plot revealed the recombination of photogenerated electron-hole pairs was inhibited as the bias potential was applied. Furthermore, the Bode plot demonstrated the lifetime (τ el ) of photoexcited electrons of BiOI-TNTAs was 1.8 and 4.1 times longer than that of BiOI-Ti and TNTAs, respectively. In the cathodic chamber, the amount of hydrogen generation reached 219.94 μM/cm 2 after 3 h of reaction time.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Ruili Lyu,Yiting Lei,Chi Zhang,Gaiping Li,Runping Han,Lina Zou
Due to widespread application of chlorpyrifos for controlling pests in agriculture, the continuous accumulation of chlorpyrifos residue has caused serious environmental pollution .The detection of chlorpyrifos is of great significance for humans and environment because it can arise a series of diseases by inhibiting acetylcholinesterase (AChE) activity. Photoelectrochemical sensing, as an emerging sensing technology , has great potential in the detection of chlorpyrifos. It is urgent that find a suitable photoelectric sensing strategy to effectively monitor chlorpyrifos. Herein, an n-n heterojunction was constructed by uniformly immobilizing n-type 3DBiOI, which had loose porous structure composed of numerous small and thin nanosheets , on the surface of TiO 2 with anatase/rutile (AR-TiO 2 ) heterophase junction. Under light irradiation , the proposed BiOI/AR-TiO 2 n-n heterojunction exhibited excellent optical absorption characteristics and photoelectrochemical activity. Additionally, the photoelectrochemical sensing platform demonstrated excellent analytical performance in monitoring chlorpyrifos. Under optimized conditions, it showed a wide detection range of 1 pg mL −1 - 200 ng mL −1 and a detection limit (S/N = 3) as low as 0.24 pg mL −1 , with superior selectivity and stability. The ultra-sensitivity and great specificity for detection of chlorpyrifos can be ascribed to chelation between Bi (Ⅲ) and C=N and P=S bonds in chlorpyrifos, which had been confirmed in this work. Meanwhile, the PEC sensor also had potential application value for monitoring chlorpyrifos in water samples, lettuce and pitaya, which the recoveries of samples ranged from 96.9% to 104.7% with a relative standard deviation (RSD) of 1.11%–5.93%. This sensor provided a novel idea for constructing heterojunctions with high photoelectric conversion efficiency and had a high application prospect for the detection of chlorpyrifos and other structural analogues.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
Yuan Wang,Xuemei Liu,Quyun Chen,Tian C. Zhang,Like Ouyang,Shaojun Yuan
Addressing arsenite pollution in groundwater has drawn great attention. It is attractive to pre-oxidize highly mobile As(III) to relatively low-toxic As(V) with a subsequent adsorption separation process. Herein, BiOI anchoring on γ-Fe 2 O 3 is performed to synthesize BiOI/γ-Fe 2 O 3 core–shell nanoparticles for efficient removal of As(III) via a simultaneous photocatalytic oxidization–adsorption process. The physical and chemical structures of BiOI/γ-Fe 2 O 3 are investigated by transmission electron microscopy , Fourier transform infrared spectroscopy , and X-ray diffraction measurements. The photoluminescence and electron spin resonance (ESR) characterization were employed to ascertain the possible reaction mechanism of visible-light-driven photocatalytic oxidation of As(III). Such BiOI/γ-Fe 2 O 3 delivers a superior As(III) removal capability under visible light irradiation with an arsenic removal efficiency of 99.8% within 180 min, higher than those of BiOCl/γ-Fe 2 O 3 (81.7%) and BiOBr/γ-Fe 2 O 3 (98.9%). The optimal BiOI/γ-Fe 2 O 3 (molar ratio of 2:1) is obtained by rationally adjusting the molar ratio of BiOI to γ-Fe 2 O 3 . The as-synthesized BiOI/γ-Fe 2 O 3 performs well in a wide pH range of 2–8. Only coexisting PO 4 3− anions have a significant effect on the As(III) removal. The free radical trapping experiment and ESR results demonstrate that the ⋅O 2 − and h + are the main active substances for the photocatalytic oxidation of As(III) on BiOI/γ-Fe 2 O 3 . This work not only gives a novel magnetic core–shell nanoparticle photocatalyst for efficient photocatalytic oxidation and adsorption of As(III) but also offers a new strategy to rationally design BiOX for its related practical applications.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
P. Velusamy,M. Sathiya,Yunpeng Liu,Shanhu Liu,R. Ramesh Babu,Mohamed Aly Saad Aly,E. Elangovan,Haibo Chang,Liqun Mao,Ruimin Xing
A two-step thermal poly-condensation and hydrothermal method is used to prepare noble metal-free nano-heterostructure of neodymium (Nd)-doped graphitic carbon nitride (g-C 3 N 4 ) and bismuth oxyiodide (BiOI). The synthesised Nd- doped g-C 3 N 4 /BiOI heterostructure shows high electron-hole separation. Moreover, a fast charge transport at the heterojunction is noted and further leads to low charge recombination rate. Consequently, the synthesised heterostructure overcomes the high charge recombination rate of g-C 3 N 4 . This work reports the effect of Nd- doping and the formed heterojunction on the structural, optical, electrical conductivity and photoelectrochemical (PEC) properties of the heterostructure. Moreover, introducing Nd dopant into g-C 3 N 4 enhances visible light absorption of g-C 3 N 4 . The optimal hetero-nanostructure (5.0 wt% Nd doped g-C 3 N 4 /BiOI) shows high photocurrent density (15.50 mA/cm 2 ) and hydrogen evolution rate (288 μmol h −1 cm −2 ) under visible light (λ ≥ 420 nm) illumination when compared to other wt.% of Nd doped g-C 3 N 4 and heterostructure. Additionally, the low emission features obtained from the photoluminescence studies and the heterojunction visually observed by HRTEM strongly emphasise that the formation of heterostructure leads to low recombination of charge carriers. Doping and forming heterostructure is shown to be an effective, controllable and an optimal approach to improve the PEC water splitting performance of g-C 3 N 4 .
研究领域:
材料科学
·
光催化
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2017
·Vol. 35
·期 1
·30-34
·
IF 1.852
Ling Qian,Chongwu Wang,Aiping Chen,Huagui Yang
Bismuth vanadate (BiVO 4 ) has been identified as one of the excellent visible-light-responsive photoanode for use in the photoelectrochemical water splitting. Recently intense research efforts have been devoted to the development of highly efficient BiVO 4 photoanode. Herein, we reported a low-cost and scalable method for preparing nanostructured BiVO 4 film. A much enhanced photocurrent (1.5 mA•cm −2 ) was obtained for such film, which was 6.5 times higher than that of planar film at 1.23 V [vs. RHE (Reversible Hydrogen Electrode)]. The method provides an eco-friendly, reproducible and facile way to scale up on different substrates with attractive potential.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Dingliang Dai,Jianhao Qiu,Ming Li,Jie Xu,Lu Zhang,Jianfeng Yao
A series of BiOI/MIL-121(Al) hybrid photocatalysts has been prepared by a facile hydrothermal method. Two-dimensional BiOI sheets are intimately anchored on rod-like MIL-121 due to the electrostatic and coordination effects between Bi 3+ and carboxyl. The BiOI/MIL-121(Al) hybrid exhibits favorable performances for visible-light-driven degradation of tetracycline. The degradation performance of the optimal sample BM-20 is more than twice as that of pure BiOI. Apart from the close contacts between BiOI and MIL-121, the hydrogen bond induced by carboxyl in MIL-121 promotes the adsorption of tetracycline, which is also conducive to the photocatalytic degradation process. Moreover, results show that photo-induced holes and superoxide radicals are both the main active species for the photocatalytic degradation of tetracycline over BiOI/MIL-121 composites. This work would inspire the materials design with specific functional groups for efficient (photo)catalytic reaction.
研究领域:
材料科学
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环境科学
·
光催化
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 31
·8978-8983
·
IF 0
Liqun Ye,Xiaodi Liu,Qiang Zhao,Haiquan Xie,Ling Zan
Charge separation is very important for increasing the activity of semiconductor-based photocatalysts. Here we show that the main active species of BiOI are photo-induced holes, rather than ˙OH and O2˙−, under visible light irradiation. Based on this finding, the cocatalyst MnOx was used to enhance the transfer of the photo-induced holes, resulting in much higher photocatalytic activity, compared with the photocatalyst without MnOx. MnOx–BiOI heterogeneous nanostructure photocatalysts have been prepared by photo-deposition in Mn(NO3)2 solution, and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and photoluminescence (PL) spectroscopy. As-prepared MnOx–BiOI exhibited higher photoactivity than BiOI and Pt–BiOI for the degradation of Rhodamine B (RhB) dye under visible light irradiation. The PL spectrum showed that MnOx enhances the separation efficiency of the photo-induced electrons and holes of BiOI. Finally, BiOI was selectively combined with a deriving-hole-type cocatalyst to enhance the photocatalytic activity, and the reason for the cocatalyst selectivity is also discussed. This finding may be useful in bismuth-based photocatalysts to construct highly efficient solar energy conversion systems.
研究领域:
材料科学
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光催化技术
·
环境科学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）