ADVANCED ENGINEERING MATERIALS
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2020
·Vol. 22
·期 8
·2000267
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IF 3.217
Hao Zou,Yi Zhou,Ye Xiang,Yuehong Deng,Yawen Tan,Haiqin Tang,Yifeng Xu
The formation of heterojunctions is an effective method to develop visible light-driven photocatalytic materials. A flower-like DUT-5@BiOBr composite is prepared by the hydrothermal method. The presence of a large number of heterojunctions in the 2D–2D interface accelerates the separation of photogenerated charges. When the mass ratio is 20%, the composite material shows the highest visible light catalysis and excellent stability in cycling experiments. The photocatalytic mechanism is analyzed by various characterization methods. The results show that the main active species in the photocatalytic process are superoxide radicals and holes and prove that the heterojunction that forms between DUT-5 and BiOBr is a type-II heterojunction. The synergy between the increase in specific surface area, the unique mesoporous structure, and the heterojunction promotes the speed of photocatalysis. Herein, new ideas are provided for the development of 2D–2D composite materials to degrade organic pollutants under visible light to solve environmental pollution.
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
Carbon Letters
·
2023
·Vol. 33
·期 3
·847-862
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IF 4.5
Guo Huilin,Yu Tingting,Zhao Lei,Qian Jun,Yu Jiahe,Zhang Yu,Teng Yongyue,Zhu Chunshui,Yang Tao,Chen Wenbin,Gong Picheng,Jiang Cuishuang,Gao Changfei,Yang Bing,Yang Chenyu
In this study, a bipolar visible light responsive photocatalytic fuel cell (PFC) was constructed by loading a Z-scheme g-C 3 N 4 /carbon black/BiOBr and a Ti 3 C 2 /MoS 2 Schottky heterojunction on the carbon brush to prepare the photoanode and photocathode, respectively. It greatly improved the electron transfer and achieved efficient degradation of organic pollutants such as antibiotics and dyes simultaneously in two chambers of the PFC system. The Z-scheme g-C 3 N 4 /carbon black/BiOBr formed by adding highly conductive carbon black to g-C 3 N 4 /BiOBr not only effectively separates the photogenerated carriers, but also simultaneously retains the high reduction of the conduction band of g-C 3 N 4 and the high oxidation of the valence band of BiOBr, improving the photocatalytic performance. The exceptional performance of Ti 3 C 2 /MoS 2 Schottky heterojunction originated from the superior electrical conductivity of Ti 3 C 2 MXene, which facilitated the separation of photogenerated electron–hole pairs. Meanwhile, the synergistic effect of the two photoelectrodes further improved the photocatalytic performance of the PFC system, with degradation rates of 90.9% and 99.9% for 50 mg L −1 tetracycline hydrochloride (TCH) and 50 mg L −1 rhodamine-B (RhB), respectively, within 180 min. In addition, it was found that the PFC also exhibited excellent pollutant degradation rates under dark conditions (79.7%, TCH and 97.9%, RhB). This novel pollutant degradation system is expected to provide a new idea for efficient degradation of multiple pollutant simultaneously even in the dark.
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
高影响因子
Science China-Technological Sciences
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2020
·Vol. 63
·期 5
·859-865
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IF 2.302
Ge Bo,Ren GuiNa,Yang Hang,Yang JingJing,Pu XiPeng,Li WenZhi,Jin ChuanYu,Zhang ZhaoZhu
It is a challenge to endow the material with the ability to pollutants degradation while maintaining the oil/water separation performance. Herein, the mixed dispersion of BiOBr photocatalyst and silicone sol was adsorbed in melamine foam. Superhydrophobic BiOBr-silicone aerogel (WCA=154°) was obtained through the transfer melamine foam to an autoclave and reaction at 80°C for 20 h. The prepared superhydrophobic BiOBr-silicone aerogel can effectively remove the water soluble pollutants which remain within the water phase after oil/water separation. The band gap of the superhydrophobic BiOBr-silicone aerogel was calculated to be 2.71 eV, which shows sensitivity to visible light (458 nm). Through mechanism analysis, it is found that the VB position of BiOBr is at 1.07 eV and the position of CB is at -1.64 eV. Finally, we prepared a superhydrophobic BiOBr-silicone aerogel (5 cm×5 cm×3 cm) for the verification of the large scale preparation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Qingming Meng,Meidan Luo,Minggong Lv
The suppression of expeditious complexation of photoexcited carriers and the enhancement of light harvesting are two extraordinarily momentous elements for boosting the catalytic activity of synthesized semiconductor photocatalyst. Herein, a sequence of visible-light-induced self-assembled flower-like spherical Bi 2 WO 6 /BiOBr S-scheme heterojunctions were successfully fabricated by two-step solvothermal process. The fabricated Bi 2 WO 6 /BiOBr hybrids possessed the splendid capacity to catalyze the degradation of bisphenol A (BPA) in water without the addition of surfactant compared to monocomponent photocatalyst. The optimized Bi 2 WO 6 /BiOBr (FBBH-16) possessed the most prominent photocatalytic activity, acquiring a conspicuous degradation efficiency of 91.97 % ± 1.51 % for BPA after 60 min illumination. The rate constant k (0.04078 ± 0.0009985 min −1 ) of FBBH-16, which was approximately 4.0 and 3.5 times that of bare Bi 2 WO 6 and BiOBr, respectively. Such strengthening mechanism was chiefly ascribed to the establishment of S-scheme heterojunction, which efficaciously impeded the complexation of photoexcited charge pairs and noteworthily heightened the light harvesting. Furthermore, the forceful interfacial interactions between Bi 2 WO 6 and BiOBr afforded much more active sites for BPA removal. The quenching experiments confirmed that ·OH and ·O 2− are the principal active species for BPA degradation over Bi 2 WO 6 /BiOBr hybrids. Ultimately, two possible photodegradation pathways of BPA over Bi 2 WO 6 /BiOBr heterojunctions are also come up with on the grounds of the identification of intermediate products. This work furnishes fresh insights into the fabrication of highly efficacious and stable bismuth-based S-scheme heterojunctions for treating the actual wastewater by integrating nanostructure and microscopic morphology.
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
Journal of Environmental Sciences
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2023
·
IF 6.9
Yang Jin,Tongyin Liu,Yanpeng Mao,Fan Li,Chun Hu
The adsorption of pollutants can not only promote the direct surface reaction, but also modify the catalyst itself to improve its photoelectric characteristics, which is rarely studied for water treatment with inorganic photocatalyst. A highly crystalline BiOBr (c-BiOBr) was synthesized by a two-step preparation process. Owing to the calcination, the highly crystalline enhanced the interface interaction between pollutant and c-BiOBr. The complex of organic pollutant and [Bi 2 O 2 ] 2+ could promote the active electron transfer from the adsorbed pollutant to c-BiOBr for the direct pollutant degradation by holes (h + ). Moreover, the pollutant adsorption actually modified c-BiOBr and promoted more unpaired electrons, which would coupling with the photoexcitation to promote generate more O 2 •– . The molecular modification effect derived from pollutant adsorption significantly improved the removal of pollutants. This work strongly deepens the understanding of the molecular modification effect from the pollutant adsorption and develops a novel and efficient approach for water treatment.
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
MATERIALS LETTERS
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2014
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IF 2.269
Meichao Gao,Dafeng Zhang,Xipeng Pu,Hong Li,Jinwei Li,Xin Shao,Keying Ding
BiOBr photocatalysts were synthesized by the combustion method. The BiOBr nanosheets possessing pure tetragonal BiOBr phase with high ratio of {001} facets exposure were obtained. The thickness of BiOBr nanosheets, in other words, the exposing proportion of {001} facets can be modulated through changing the added amount of ammonium bromide. The band gap energy of BiOBr was increased with larger exposing proportion of {001} facets. BiOBr with the thinest sheets exhibited the best photocatalytic activity of Rhodamine B under visible-light irradiation. To the end, the corresponding plausible growth mechanism of BiOBr was presented.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
OPTICAL MATERIALS
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2021
·
IF 3.08
Yang Wang,Sheng Feng,Wei Wu,Yun Zhou,Zhiwei Ye,Xiaojun Dai,Xun Cao
In this article, we reported a method for synthesizing cluster-like NH 2 -MIL-125(Ti)/BiOBr (NMT/B) Z type heterojunction composite materials with different content by using ionic liquid as bromine source assisted solvothermal method. In visible light , the photocatalytic activity of the materials was analyzed by degradation of tetracycline. Characterize the prepared composite material by XRD , FTIR, SEM, TEM, XPS , UV–vis diffuse reflection spectra (DRS). The result proved that the NH2-MIL-125(Ti) (NMT) nanosheets were tightly loaded on the BiOBr surface. NMT/B composite materials showed higher catalytic activity than monomer materials. The removal rate of TC reached 88% in 90min, which was 3 times and 5.7 times that of the monomer NMT and BiOBr monomer materials, respectively. In the catalytic process, –O 2 - and h + are the main active substances that degrade pollutants. This is proved by free radical capture experiments. It could be inferred that the improved photocatalytic activity of NMT/B composites was contributed to the good energy band structure and the formation of Z-type heterojunctions in close contact, which greatly facilitates the photogenerated carrier and hole migration and dissociation. Cycle experiment proved that the prepared composite material has excellent stability, which indicated that it had a good prospect in practical applications.
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
Analytical Methods
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2021
·Vol. 13
·期 15
·1803-1809
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IF 2.896
Mingqing Li,Li Li,Boya Li,Liying Zhai,Baohui Wang
The design and construction of a photoelectrochemical (PEC) sensor with excellent photoelectric properties and good photoelectrocatalysis activity is significant for the effective detection of analytes. In this paper, based on a two-step anodic oxidation method and successive ionic layer adsorption (SILAR) method, a TiO2 nanotube array (TNT) photoelectrochemical sensor modified with BiOBr nanosheets was constructed and applied for the detection of H2O2 for the first time. The photocurrent of the photoelectrochemical sensor increases with the increase of the H2O2 concentration under the irradiation of an 8 W UV lamp. Excellent linearity was obtained in the concentration range from 10 nM to 100 μM with a low detection limit of 5 nM (S/N = 3). This excellent photoelectrochemical performance is due to the formation of a p–n heterojunction between BiOBr and TiO2 nanotube arrays, which provides efficient separation of charge carriers and accelerates electron transport. Moreover, it is applied to detect H2O2 in milk samples and it showed a good recovery result ranging from 95.73% to 105.65%, which provides a promising new strategy for the detection of H2O2.
研究领域:
材料科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Junyang Zhang,Yacong Yang,Zechun Sun,Danyang Zhao,Yingxiu Gao,Tianhan Shen,Yan Li,Zongli Xie,Yuning Huo,Hexing Li
Membrane technologies offer great potential in desalination and wastewater treatment . However, the serious issue of membrane fouling results in the unsatisfactory sustainability and reusability for treating wastewater containing high level of organic foulants. In this work, a photocatalytic membrane reactor system combining Ag@BiOBr photocatalyst and polyvinylidene fluoride (PVDF) ultrafiltration with remarkable anti-fouling property was constructed. The integrated Ag@BiOBr/PVDF photocatalytic ultrafiltration membranes were prepared by blending Ag@BiOBr nanoparticles (NPs) into PVDF membrane via phase inversion method. The membrane separation performance and fouling resistance were studied in a cross-flow ultrafiltration system using bovine serum albumin (BSA) as the model foulants. Compared with the pristine PVDF membrane, the hydrophilicity and surface smoothness of composite membranes were promoted by photocatalyst-incorporation, the Ag@BiOBr/PVDF membrane with the optimal Ag@BiOBr blending content of 2.0 wt% achieved both enhanced water flux and higher BSA rejection efficiency. More importantly, the mechanism of anti-fouling and self-cleaning performances were further studied, the photocatalysis process based on Ag@BiOBr/PVDF membrane effectively decomposed the BSA foulant into broken protein with induced change of carbonyl, ionic bond and hydrogen bond contents in BSA foulants via the active radicals, weakened the intermolecular force of BSA foulants to prevent membrane pore blockage. Meanwhile, the broken protein peptide chains with more negative charges could result in the strength of electrostatic repulsive forces between BSA molecules and membrane. As a result, the BSA foulant could be stably removed in the Ag@BiOBr/PVDF photocatalytic ultrafiltration system under visible light irradiation, achieving the excellent anti-fouling performance by preventing the membrane pore blockage and foulant adhesion. We believe the Ag@BiOBr/PVDF photocatalytic membrane presented in this study will be one example among many photocatalyst-membrane combinations that can be further pursued for organic pollutants removal. In particular, we expect the theoretical support can present a great opportunity to design novel photocatalytic membranes with sustainable anti-fouling performance.
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
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 33
·14180-14188
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IF 3.288
Jingjing Zhang,Jingtao Dai,Jian Chen
To compare photodegradation processes in single- and binary-contaminant systems, a representative antibiotic (tetracycline) and insecticide (imidacloprid) were employed as two contaminants of emerging concern. Ag/AgBr modified BiOBr was synthesized hydrothermally in an ionic-liquid/water medium and characterized via various techniques to support mechanistic studies. As-prepared flower-shaped Ag/AgBr/BiOBr exhibits superior photocatalytic activity to Ag/AgBr and BiOBr. Parallel experiments were conducted in single-contaminant systems to optimize the solution chemistry for comparison studies; these suggested that the photodegradation rate (DR) is highest at 1.0 g L−1 at catalyst dosages ranging from 0.6 to 1.4 g L−1, while raising the initial concentration reduces the DR. Additionally, electrostatic interactions between the reactants and photocatalyst cause DR fluctuations at different pH values. In the mechanistic studies, the contributions of the dominant active species (˙O2− and h+) were analysed quantitatively through quenching tests with scavengers. Furthermore, electrostatic interactions between the reactants and the active species result in non-equilibrated contributions from ˙O2− and h+ in single-contaminant systems. Comparison studies distinctly demonstrated a synergistic effect in binary-contaminant systems, which is caused by the mutually complementary utilization of h+ and ˙O2− during the photodegradation of tetracycline and imidacloprid.
研究领域:
环境科学
·
催化材料
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 22
·26465-26479
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IF 2.478
Zhu Wanrong,Song Jimei,Wang Xule,Lu Yun,Hu Gang,Yang Jie
A series of Ag/AgBr/BiOBr photocatalysts with different weight contents of Ag/AgBr were successfully constructed via a simple precipitation method in 80 °C water bath. Photocatalysts were characterized by XRD, XPS, SEM, TEM, N 2 Adsorption-Desorption (BET), and UV–Vis Diffuse Reflectance Spectroscopy (DRS). Compared with BiOBr and Ag/AgBr, all the composite photocatalysts show the prominent photocatalytic activity for the degradation of tetracycline (TC). Especially, 1:5Ag/AgBr/BiOBr (20%) has the highest reaction rate constant (kapp = 0.20 min −1 ). Moreover, according to the results of radical scavengers runs, ·OH and h + acted as the main reactive species in the degradation process. Based on above, a possible photocatalytic mechanism for organics degradation over Ag/AgBr/BiOBr was proposed. Interestingly, the redox cycle between O 2 /·O 2 − and Br − /Br 0 assisted with the surface plasmon resonance (SPR) effect of silver dramatically promotes the separation and transfer of electron–hole pairs, and improves the photocatalytic activity of the as-obtained composite samples.
研究领域:
环境科学
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材料科学
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光催化技术
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2015
·
IF 3.091
Meichao Gao,Dafeng Zhang,Xipeng Pu,Hong Li,Dongdong Lv,Bingbing Zhang,Xin Shao
Bi/BiOBr photocatalysts with improved photodegradation performances were synthesized by a facile one-step hydrothermal method using ethanol–water mixed solution. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, UV–vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The addition of ethanol results in the partial reduction of Bi 3+ ions to metallic Bi, different morphology from pure BiOBr , and the formation of oxygen vacancies. The dosage of ethanol plays a vital role in the morphologies and photodegradation performances of as-obtained Bi/BiOBr. The Bi/BiOBr photocatalysts show improved photodegradation performances, which is attributed to the high surface area, narrow band gap, and inhibited recombination of electron–hole pairs .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）