RSC Advances
·
2019
·Vol. 9
·期 25
·14286-14295
·
IF 3.049
Wenhui He,Yawen Wang,Caimei Fan,Yunfang Wang,Xiaochao Zhang,Jianxin Liu,Rui Li
The introduction of oxygen vacancies (OVs) on the surface of photocatalysts has already been proven to be an effective way to extend the light response to visible light and trap charge carriers, thereby promoting the photocatalytic performance. In this study, h-BN/OV-BiOCl composites were prepared using hexagonal boron nitride (h-BN) to further improve the visible-light photocatalytic activity of oxygen-vacancy-enriched bismuth oxychloride (OV-BiOCl). The composition and morphology of these materials were investigated, and the photocatalytic performance experiments showed that the introduction of h-BN could significantly improve the visible-light photocatalytic activity of OV-BiOCl, which was 1.7 and 1.4 times that of pure OV-BiOCl for the degradation of rhodamine B (RhB) and bisphenol A (BPA) when the h-BN content was 5 wt%, respectively. The role of h-BN was comprehensively investigated, and the results revealed that the presence of negatively charged h-BN could improve the separation efficiency of photoinduced electrons (e−) and holes (h+) by promoting the migration of positively charged h+ to the surface of the photocatalyst, as expected. Moreover, the oxygen vacancies in OV-BiOCl were increased in the presence of h-BN; this favored the activation of more adsorbed O2 for the oxidation of pollutants. Finally, a probable mechanism was proposed for the improved photocatalytic activity of the h-BN/OV-BiOCl composites. This study provides an insight into the roles of h-BN in oxygen-vacancy-enriched photocatalysts.
研究领域:
材料科学
·
环境科学
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DOI
PubMed
高影响因子
Acta Biomaterialia
·
2021
·
IF 8.947
Yongtian Liu,Jing Zhang,Jun Du,Kang Song,Jinliang Liu,Xiang Wang,Bing Li,Ruizhuo Ouyang,Yuqing Miao,Yun Sun,Yuhao Li
Various physiological characteristics of the tumor microenvironment (TME), such as hypoxia, overexpression of glutathione (GSH) and hydrogen peroxide (H 2 O 2 ), and mild acidity, can severely reduce the efficacy of many cancer therapies. Altering the redox balance of the TME and increasing oxidative stress can accordingly enhance the efficacy of tumor therapy. Herein, we developed a bismuth-based Cu 2+ -doped BiOCl nanotherapeutic platform, BCHN, able to self-supply H 2 O 2 for TME-regulated chemodynamic therapy (CDT) combined with sensitized radiotherapy (RT). BCHN released H 2 O 2 and consumed GSH to degrade the composite in the slightly acidic TME, and generated hydroxyl radicals (•OH) via a Fenton-like reaction catalyzed by copper ions , to achieve oxidative stress-enhanced CDT. The Fenton-like reaction also catalyzed H 2 O 2 to produce O 2 to relieve tumor hypoxia , and combined with the X-ray-blocking property of bismuth to realize TME-enhanced radiotherapy. Synergistic CDT/RT has previously been shown to effectively inhibit tumor cell proliferation and achieve effective tumor control. The current results demonstrated a highly efficient multifunctional bio-degradable nanoplatform for oncotherapy. Statement of significance Tumor microenvironment-modulated synergy of radiotherapy and chemodynamic therapy is conducive to rapid tumor ablation. Based on this principle, we fabricated a biodegradable BiOCl-based nanocomposite , BCHN. By supplying H 2 O 2 , a Fenton-like reaction generated •OH and O 2 catalyzed by copper ions, and consumed glutathione to biodegrade the composite. Overall, these actions increased tumor oxidative stress and realized the synergistic anti-tumor actions of chemodynamic therapy combined with bismuth-based sensitization radiotherapy . This strategy thus provides a unique approach to oncology therapy.
研究领域:
肿瘤学
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纳米医学
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生物材料学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Siwen Gong,Gangqiang Zhu,Ran Wang,Fei Rao,Xianjin Shi,Jianzhi Gao,Yu Huang,Chaozheng He,Mirabbos Hojamberdiev
Hollow hierarchical BiOCl (BOC) assembled by nanosheets with highly exposed (001) facet is synthesized via a gas-bubble-template strategy. The as-synthesized BOC is further modified by thermal treatment in N 2 to in-situ introduce oxygen vacancies (OVs) and metallic bismuth (Bi 0 ) nanoparticles from the BOC lattice (Bi 0 /OVs-BOC). Thermal treatment in N 2 enables an intimate contact between OVs-BOC and Bi 0 nanoparticles, which is conducive to the transfer of photogenerated charge carriers. In CO 2 photoreduction test, the Bi 0 /OVs-BOCs exhibit almost 100 % selectivity towards CO, and some of the samples also have a significant increase in yield. For instance, BOC-250 shows about 24.82 μ mol∙g –1 h –1 CO 2 -to−CO photoreduction efficiency which is nearly four times higher than that of the BOC with high stability. It is found that suitable energy band structure and desirable intrinsic carrier mobility account for the substantial enhancement of CO 2 -to−CO photoreduction activity due to the in-situ introduction of OVs and Bi 0 nanoparticles. Density functional theory (DFT) calculations unveil that the decreased reaction energy, the weakened adsorption energy for CO, and suitable adsorption energy for H and OH of Bi 0 /OVs-BOC lead to high selectivity. This work sheds light on the synergistic effect of in-situ formed OVs and metal nanoparticles on enhancing the photocatalytic activity and selectivity of solar energy materials.
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
ENVIRONMENTAL RESEARCH
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2022
·
IF 8.431
Yichao Deng,Mengying Xu,Xiangyang Jiang,Junting Wang,Pier-Luc Tremblay,Tian Zhang
Crystal plane regulation, defect engineering, and element doping can effectively solve the problems of large band gaps, poor light absorption , and fast recombination of BiOCl. In this work, iodine-doped BiOCl (I/BiOCl) nanowafers with abundant (110) crystal planes and oxygen vacancies (OV) were prepared by a simple hydrothermal method and assessed for pollutant photodegradation . I/BiOCl with a molar ratio of I to Cl of 0.6 (I 0.6 /BiOCl) degraded under visible light 95.8% of the toxic dye rhodamine B and 85.1% of the persistent antibiotic tetracycline in 5 and 10 min, respectively. In comparison, unmodified BiOCl photodegraded only between 42.0% and 48.2% of these critical water pollutants . Furthermore, I 0.6 /BiOCl was highly stable with most of its photocatalytic activity remaining after 4 cycles. Three reasons explain the excellent photodegradation properties of I 0.6 /BiOCl. First, the doped photocatalyst grew abundant (110) crystal planes, which inhibits the recombination of photogenerated electron-hole pairs. Second, the large quantity of OV present in I 0.6 /BiOCl increased active sites for reactive oxygen species generation, improved photogenerated charge separation, and pollutants adsorption. Lastly, I 0.6 /BiOCl had a modified electronic band structure enhancing light absorption. Overall, these results describe a promising photocatalyst capable of degrading efficiently major pollutants with different structures.
研究领域:
环境科学
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材料科学
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化学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Qiuyi Ji,Zhe Xu,Weiming Xiang,Yijie Wu,Xinying Cheng,Chenmin Xu,Chengdu Qi,Huan He,Jiapeng Hu,Shaogui Yang,Shiyin Li,Limin Zhang
A novel n-n type inorganic/organic heterojunction of flaky-like BiOCl/PDI photocatalyst was constructed by water bath heating method. Meanwhile, a simple method - secondary self-assembly was used to prepare the BiOCl/PDI with a special band structure. The photocatalytic activities were evaluated by degrading aqueous organic pollutants under visible light (λ > 420 nm). The removal rates of 5 mg L −1 phenol (non-ionic type), methyl orange (MO, anionic type), rhodamine B (RhB, cationic type) and 10 mg L −1 RhB by secondary self-assembly BiOCl/PDI (BiOCl/PDI-2) were 8.0%, 3.4%, 27.8% and 78.9% higher than self-assembly BiOCl/PDI (BiOCl/PDI-1) under visible light (λ > 420 nm). The better photocatalytic activity for BiOCl/PDI-2 was attributed to the optimization of energy-band structures, which arose from different exposed surfaces, narrower interplanar spacing and stronger visible light absorption performance. Under acidic condition, BiOCl/PDI-2 showed a good photocatalytic activity, which was not affected by neutral ionic intensity and had good recycling properties. Moreover, the photocatalytic mechanism was explored by free radical capture test and electron paramagnetic resonance (EPR), and contribution of active species was calculated. The main active species of BiOCl/PDI-2 were ·O 2 − , 1 O 2 and h + . Our work may provide a route to design efficient inorganic/organic heterojunctions for organic pollutants degradation .
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
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Junxiu Wang,Zhenzong Zhang,Xi Wang,Yi Shen,Yongfu Guo,Po Keung Wong,Renbi Bai
A novel p-n heterostructure photocatalyst m-Bi 2 O 4 /BiOCl was successfully synthetized through a facile ion-etching method. Via adjusting the added volume of HCl solution, a series of different ratios of composite photocatalysts were obtained. The as-prepared samples of physical, chemical and optical characteristics were examined by X-ray diffraction, scanning electron microscope, transmission electron microscope, energy dispersive X-ray spectroscopy, selected-area electron diffraction, Fourier transform infrared absorption, Raman microscope, N 2 adsorption-desorption, X-ray photoelectron spectroscopy and UV-vis spectrum technologies. The photocatalysts showed high degradation rate and complete mineralization ability for methyl orange and tetracycline solution under visible light. The reaction rate constant of m-Bi 2 O 4 /BiOCl for methyl orange was 52.28 times higher than that of BiOCl. The characterization presented a good stability of materials. Furthermore, the photocurrent response test certified that the heterostructure effectively accelerated the separation and migration of photo-generated carries. The scavenger experiments evidenced that hole (h + ) and superoxide radical (•O 2 — ) were the primary active radicals. A possible photocatalytic mechanism was proposed. This work provided an alternative photocatalyst applied to water environmental remediation.
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
Small
·
2024
·
IF 13
Lulu Zhao,Jinguo Wang,Ruifang Yan,Shuo Wang,Ziyi Liao,Hongli Yang,Dongjiang Yang,Huilin Hou,Weiyou Yang
BiOCl-based materials have emerged as promising photocatalysts for converting CO 2 into valuable products and fuels. However, challenges such as low light absorption and inefficient charge carrier separation require effective solutions, with vacancy engineering offering a promising approach. Current research primarily focuses on anion vacancies, leaving cation vacancies less explored. In contrast, this study presents a novel method to enhance visible-light-driven photocatalysts by Bi cation vacancies in ultrathin BiOCl nanosheets through a straightforward hydrochloric acid etching process (HAE-BiOCl). These introduced Bi vacancies not only expand the light absorption range and enhance carrier separation, but also serve as active sites for CO 2 adsorption. Additionally, Bi vacancies can effectively lower the activation energy of COOH − species and thereby enhance overall reaction activity. As a result, the HAE-BiOCl catalyst exhibits exceptional photocatalytic CO 2 reduction performance without the need for co-catalysts or sacrificial agents. It achieves high CO generation rates of 68.39 and 17.43 µmol g −1 h −1 under 300 W Xe lamp and visible light irradiation, respectively. These rates are significantly higher compared to counterparts without vacancy creation and surpass those of most reported Bi-based photocatalysts. This study underscores the potential of inducing cation vacancies via acid etching as a valuable strategy for advancing photocatalysis.
研究领域:
材料科学
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环境科学
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化学工程
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纳米技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 26
·1-14
·
IF 2.8
Zang Shihui,Pan Yusong,He Shuhuan,Huang Run
BiOCl/Ti 3 C 2 catalyst was synthesized via a hydrothermal method and combination with self-assembly technology. The crystal phase, microstructure, surface chemical state, and optical properties of BiOCl/Ti 3 C 2 catalysts were investigated using XRD, FTIR, SEM/TEM, XPS, and DRS technologies. The enhanced catalytic performance of BiOCl/Ti 3 C 2 catalysts were demonstrated by the degradation of the organic pollutants in visible light irradiation/Fenton-like synergistic system. The degradation results revealed that the catalytic degradation efficiency of the BiOCl/Ti 3 C 2 catalysts presents the first increasing and then decreasing trend with the rise of Ti 3 C 2 content. And the BiOCl/Ti 3 C 2 catalyst with 8-wt% Ti 3 C 2 exhibited highest degradation efficiency in the light irradiation/Fenton-like synergistic system, whose removal rate of RhB was 97.80% within 10 min, which was significantly higher than that in the sole visible light irradiation (83.58%, 10 min) and that in the sole Fenton-like system (only 3.11%, 10 min). The result verified that the visible light irradiation and Fenton-like system has a positive synergistic effect for enhancing the catalytic efficiency of the BiOCl/Ti 3 C 2 catalysts. The influence of environmental conditions such as catalyst dosage, H 2 O 2 dosage, and the anions on the catalytic performance were also investigated. The results showed that with the increase of catalyst dosage and H 2 O 2 dosage, the rate constant ( K value) also increased. The presence of Cl -1 in the system was advantageous for improving the catalytic degradation efficiency, whereas the presence of CO 3 2- in the system significantly inhibited catalytic degradation efficiency. The degradation mechanism revealed that the existence of Ti 3 C 2 in the BiOCl was beneficial for improving the ability of photo-generated charge carrier separation. The active free radicals such as singlet oxygen ( 1 O 2 ), superoxide radicals (· \({\text{O}}_{2}^{ - }\) ), and photo-generated holes (h + ) plays the main role for organic pollutants degradation.
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
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 20
·205602
·
IF 3.874
Zhongxiang Yang,Zhichao Shang,Fang Liu,Yirui Chen,Xiaohong Wang,Bangsheng Zhang,Guiqing Liu
The hollow porous microspheres assembled with BiOCl nanocrystals were successfully synthesized via a facile spray solution combustion synthesis method. The microstructure, morphology, absorbance, optical properties of the samples were investigated in detail. The results show that hollow porous BiOCl microspheres have narrow band gaps (2.66–2.71 eV), and the degradation rate of rhodamine B (RhB) can reach 98% under visible light irradiation for 60 min. Furthermore, the mechanism of the photocatalytic degradation of RhB was proposed through the experiment of trapping active species. This excellent photocatalytic property can be ascribed to the larger specific surface area and the special microstructure.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Runren Jiang,Donghai Wu,Guanghua Lu,Zhenhua Yan,Jianchao Liu,Ranran Zhou,Matthew Nkoom
Herein, Fe 3 O 4 quantum dots modified BiOCl/BiVO 4 p-n heterojunction was successfully synthesized by a facile strategy. Multiple techniques were carried out to characterize the as-prepared samples. Results show that the photocatalysts possess regular crystal structure and consisted of BiOCl/BiVO 4 nanosheet structure with Fe 3 O 4 QDs on its surface. Particularly, 20% Fe 3 O 4 QDs@BiOCl/BiVO 4 p-n heterojunction shows universal outstanding photocatalytic activity for removing four different broad-spectrum antibiotics under visible light. Meanwhile, the mineralization degree and degradation pathways of antibiotic were further studied by 3D-EEMs and LC-MS/MS. The improved photocatalytic performance for degradation of broad-spectrum antibiotics mainly attributes to the effective charge carrier mobility, large specific surface areas, and strong visible light absorption. The photocatalytic reaction mechanism was also revealed by the electron spin resonance (ESR) technique and the active species trapping experiments. The photocatalyst stays stable crystal structures after four reaction cycles and it can be easily separated from the solution by an external magnetic field both demonstrate that the Fe 3 O 4 QDs@BiOCl/BiVO 4 p-n heterojunction has unlimited potential for practical usage. This work is expected to be widely applicable to the removal of broad-spectrum antibiotics.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yu Zhu,Liwei Lin,Man Zhou,Han Li,Yanan Wang,Song Xu,Zhongyu Li
The conversion of greenhouse gas CO 2 into usable high-value-added fuels through photocatalytic reactions is a promising green energy measure. However, the photocatalytic CO 2 reduction reaction faces challenges such as multi-electron transfer and slow mass transfer. Furthermore, most photocatalysts can only absorb ultraviolet light and have insufficient active sites, resulting in a low utilization rate of sunlight. Based on this, we designed a novel layered composite catalyst, where Ti 3 C 2 T x MXene serves as the supporting framework and BiOCl nanosheets are uniformly grown on its surface. Under simulated sunlight, the CH 4 yield is 30.07 μmol·g −1 ·h −1 , with a selectivity of 93.4 %, and it still maintains excellent stability after six photocatalytic cycle experiments. Research data indicates that with the intervention of reducing ethylene glycol, the oxygen vacancy content on Ti 3 C 2 T x /BiOCl is significantly increased. The formation of oxygen vacancies and Schottky heterojunctions not only enhances the charge separation efficiency at the interface but also selectively reduces CO 2 to CH 4 .
研究领域:
环境科学
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材料科学
·
化学工程
·
纳米技术
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产品关联
DOI
高影响因子
ChemCatChem
·
2019
·Vol. 11
·期 11
·2676-2682
·
IF 4.495
Qinglin Yuan,Wanbing Gong,Yixing Ye,Jun Liu,Yue Lin,Chun Chen,Haimin Zhang,Pengfei Li,Weiren Cheng,Xiangjun Wei,Changhao Liang
Graphical Coupling reaction : A novel Pd/BiOCl catalyst is designed to catalyze benzaldehyde for high-selectively synthesizing benzoin ethyl ether utilizing the nucleophilic action of Cl − ions. DFT calculations and experimental evidences demonstrated the key role of dissociated Cl − ions with Pd NPs by suppressing the dissociation of Cl − ions and changing the reaction pathway. Exploring novel catalyst supports with unique performance creates more opportunity for transforming organic chemicals in heterogeneous catalysis. In this paper, BiOCl is first presented as an effective support for Pd nanoparticles (NPs) toward application in the coupling reaction of benzaldehyde. The Cl − ion dissociates from BiOCl, which forms nucleophile with Pd nanoparticles; this is key for the one-step synthesis of benzoin ethyl ether, the conversion and selectivity of which can reach to 100 % and 97.9 % at 100 °C, respectively. DFT calculations reveal that Cl − ions can be stabilized by stronger Bi−Cl bonds through doping of Fe ions in substituting Bi sites in BiOCl. The parallel catalytic evaluation using Pd/Fe-doped BiOCl catalyst shows the suppression of coupling reaction, conversely, demonstrating the crucial role of nucleophile. This work provides new insights into support tailoring for the synthesis of vital organic chemicals in heterogeneous catalysis by changing chemical reaction pathway.
研究领域:
催化化学
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材料科学
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有机化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）