COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Dandan Liu,Jinghao Hua,Weijie Zhang,Kai Wei,Shushan Song,Qianyu Wang,Ziheng Song,Huarui Han,Changchang Ma,Sheng Feng
Building efficient catalysts is an urgent issue in the field of photocatalytic CO 2 reduction, and Z-scheme heterojunction structures can availably suppress the recombination of photo generated carriers and improve photocatalytic performance. This study successfully prepared a new type of Bi 4 O 5 Br 2 /Bi-MOF composite photocatalyst through self-assembly method. After 5 h of simulated sunlight exposure, the optimized sample 50-Bi 4 O 5 Br 2 /Bi-MOF photocatalytic reduction of CO 2 to CO efficiency (23.78 μmol·g −1 ·h −1 ) was 5.09 times higher than pure Bi 4 O 5 Br 2 , and the CH 4 yield (5.39 μmol·g −1 ·h −1 ) was 2.52 times that of pure Bi-MOF. In addition, in the cyclic experiment, the catalyst had high stability and reusability. The Z-scheme charge transfer mechanism was confirmed through band structure analysis, Electron spin resonance (ESR), Ultraviolet photoelectron spectroscopy (UPS) and other related characterizations. This work provided an important strategy for designing efficient Z-scheme heterojunction photocatalysts.
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
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Yunmeng Cao,Lin Yue,Zaixing Li,Yonghui Han,Jing Lian,Huiping Qin,Shuyan He
In this study, Sn–Bi–MOF/Ti 3 C 2 heterojunction catalysts were prepared using the solvothermal method, and their photocatalytic ability to degrade and mineralize tetracycline (TC) under illumination was investigated. After 90 min of photocatalysis, the pollutant had a degradation efficiency of 96.2% and a mineralization rate of 45.5%. The physicochemical properties of the catalysts were analyzed using various methods. The effects of the solution pH, coexisting anions, and water quality on the catalyst performance were investigated. ·O 2 − and h + are the main active substances in the photocatalytic mechanism, as demonstrated by free-radical quenching experiments and EPR tests. The degradation of TC and the intermediates produced were determined using 3D fluorescence and LC-MS. The photocatalytic mechanism of Sn–Bi–MOF/Ti 3 C 2 was proposed based on free radical determination and electrochemical tests. The formation of the Schottky junction accelerated the transfer of electrons to Ti 3 C 2 and improved the separation of charges, which led to the generation of free radicals. Sn–Bi–MOF/Ti 3 C 2 still exhibited good catalytic ability after four cycles of the experiments, and the XRD patterns before and after the reaction were consistent, which illustrates that the composite structure was stable. Overall, Sn–Bi–MOF/Ti 3 C 2 has promising applications in the photocatalytic removal of refractory 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
Sustainable Chemistry and Pharmacy
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2023
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IF 6
Qiuyun Zhang,Yanting Lei,Luyan Li,Jiao Lei,Mengmeng Hu,Taoli Deng,Yutao Zhang,Peihua Ma
A novel Bi-based metal-organic framework impregnated phosphomolybdic acid (PMA@Bi-MOF) catalyst has been fabricated via a simple hydrothermal procedure, and successfully applied in the preparation of biodiesel using oleic acid (OA) as the raw material. The PMA@Bi-MOF composites were exhaustively characterized with the help of FTIR , XRD, TPD-NH 3 , SEM-EDX, N 2 -physisorption, TGA , and XPS analyses. Experimental findings showed that the PMA@Bi-BTC exhibited a higher activity than that of PMA@Bi-BDC and Bi-BTC, attributed to its textural property, the presence of more acid sites with higher strength, and synergistic catalytic effects between PMA and Bi-BTC. The optimum conditions for esterification of OA, with a conversion of up to 92.5%, were found to be a molar ratio of methanol to OA of 20:1 and 0.15g PMA@Bi-BTC catalyst at 160 °C in 3 h. Meanwhile, reused studies indicated that the OA conversion reached more than 80% after seven reaction cycles. Furthermore, the activation energy of esterification catalyzed by PMA@Bi-BTC was also calculated as 54.8 kJ/mol. It is expected that our study provides an efficient route to biofuel production involving polyoxometalates/MOF synergistic catalysts.
研究领域:
催化化学
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能源科学
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材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Jingjing Wang,Zhiwei Liu,Liying Wang,Lu Li,Qian Liu,Zhiwei Liu,Zhenzhu Cao,Yongfeng Zhang,Lin Cheng,Jucai Yang
Type II heterojunction photocatalysts possessed excellent redox properties and had great potential for environmental remediation applications. In this paper, a novel Bi source of Bi-MOF was created by using NaBiO 3 . Additionally, KCl was incorporated to contest Bi-MOF for the Bi source, with the objective of generating floral BiOCl. Subsequently, heterostructures based on metal-organic skeletons (MOFs) were constructed with Bi-MOF and BiOCl, with the aim of exposing the (002) crystal faces of BiBDC. The modification of the (002) crystal surface was employed to create holes or generate more photogenerated electrons, resulting in efficient degradation of rhodamine B (RhB) and simultaneous reduction of hexavalent chromium. The heterogeneous structure demonstrated a degradation rate of 97 % for rhodamine B (RhB) after reaching adsorption equilibrium in 30 min of dark reaction and 10 min of visible light irradiation. Furthermore, the reduction rate of hexavalent chromium (Cr (VI)) was 95.5 % after reaching adsorption equilibrium in 30 min of dark reaction and 70 min of visible light irradiation . The results of the cycling experiments demonstrated that both 1:1 BBOC and 1:3 BBOC retained their structural integrity following four cycles. The active species trapping results indicated that the hole radicals (h + ) and electrons were responsible for the degradation of RhB and the reduction of hexavalent chromium, respectively. This study also revealed the degradation pathways and mechanisms of heterojunctions, providing new ideas for the preparation of photocatalysts for environmental remediation.
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
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2020
·Vol. 36
·期 1
·120-126
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IF 1.063
Chen Jianfei,Chen Xiaoyu,Zhang Xing,Yuan Yao,Bi Ruyi,You Feifei,Wang Zumin,Yu Ranbo
BiVO 4 , a promising visible-light responding photocatalyst, has aroused extensive research interest because of inexpensiveness and excellent chemical stability. However, its main drawback is the poor photoinduced charge-transfer dynamics. Building nanostructures is an effective way to tackle this problem. Herein, we put forward a new method to prepare nanostructured BiVO 4 from Bi-based metal-organic frameworks[Bi-MOF(CAU-17)] precursor. The as-prepared material has a rod-like morphology inherited from the Bi-MOF sacrificial template and consists of small nanoparticle as building blocks. Compared with its counterparts prepared by conventional methods, MOF-derived nanostructured BiVO 4 shows better light absorption ability, narrower bandgap, and improved electrical conductivity as well as reduced recombination. Consequently, BiVO 4 nanostructure demonstrates high photocatalytic activity under visible light towards the degradation of methylene blue. Methylene blue can be degraded up to 90% within 30 min with a reaction rate constant of 0.058 min −1 . Moreover, the cycling stability of the catalyst is excellent to withstand unchanged degradation efficiency for at least 5 cycles.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
POLYMER COMPOSITES
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2024
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IF 4.8
Songbo Tan,Peipei Jiang,Jun Liu,Xuan Yang,Yifeng Lai,Xiaowei Hu,Guowen Peng,Guohui Wang
With the increasing complexity of radiation environments, the development of effective shielding materials against 222 Rn and gamma radiation is critical for ensuring human health and safety. This study utilized a two-step hydrothermal method to synthesize Gd₂O(CO₃)₂@bismuth-based metal–organic frameworks (Bi-MOFs)/graphene nanoplatelets (GBG) composite fillers, followed by melt blending and hot-press molding to develop GBG/polymethyl methacrylate (PMMA) composites aimed at shielding against 222 Rn and gamma radiation. The successful synthesis and structural integrity of the composites were confirmed using various characterization techniques, including x-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, and energy-dispersive x-ray spectroscopy. The experimental results indicate that the GBG composite filler exhibits superior enhancement in 222 Rn shielding capabilities, with the 222 Rn diffusion coefficient of GBG/PMMA-20 composites reduced to 1.41 × 10 −13 m 2 /s, a 98.6% decrease compared to pure PMMA (1.04 × 10 −11 m 2 /s). Furthermore, the GBG demonstrates outstanding improvements in gamma-ray shielding performance, with the mass attenuation coefficient of GBG/PMMA-50 reaching 2.70 cm 2 /g for 59.5 keV gamma rays, nearly 16 times higher than that of pure PMMA (0.16 cm 2 /g). Additionally, thermogravimetric analysis revealed that the introduction of GBG fillers significantly improves the thermal stability of the PMMA composites. This work could offer an innovative approach to the design of 222 Rn and gamma radiation shielding materials. Highlights Developed a novel composite for enhanced 222 Rn and gamma radiation shielding. Introduced Gd-based fillers to enhance gamma radiation attenuation in PMMA composites. Achieved superior thermal stability in PMMA composites compared to pure PMMA. Materials designed for application in high-radiation environments, including mining.
研究领域:
材料科学
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辐射防护
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复合材料
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Dingliang Dai,Jianhao Qiu,Guanglu Xia,Yong Tang,Zhonghao Wu,Jianfeng Yao
Core-shell Bi-MOF@BiOX (X = I, Br and Cl) hybrids were fabricated by a one-pot solvothermal strategy via regulating the concentration and type of halogen ions in the Bi-based CAU-17 synthesis. By virtue of the competitive coordination effect to Bi 3+ between CAU-17 and BiOX, CAU-17 was converted into another Bi-MOF with similar structures and compositions. Moreover, Bi 3+ plays the role of “bridge” and endows an intimate interface contact between BiOX and the Bi-MOF, which immensely expedites the charge and mass transportation. The obtained Bi-MOF@BiOX hierarchical heterostructures were applied to photocatalytic elimination of solo and mixed pollutants (Cr(VI)/tetracycline and Cr(VI)/o-nitrophenol), and exhibited favorable performances. Choosing Bi-MOF@BiOI as a typical example, the corresponding performances for Cr(VI) reduction, tetracycline and o-nitrophenol degradation in their solo systems are 14, 10, 8 times higher than those of CAU-17, and 13, 7, 5 times higher than those of BiOI under visible light, respectively. Of note, the above photocatalytic performances could be further improved in the coexisting environment of Cr(VI) and tetracycline or o-nitrophenol, which is attributed to the elevated charge separation efficiency caused by the timely consumption of photo-excited electrons and holes. This work gives some insights into the delicate design of MOF photocatalysts and their applications in environmental restoration.
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
ACS Applied Materials & Interfaces
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2021
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IF 9.229
Mei-Ling Xu,Xiao-Jie Jiang,Jia-Ran Li,Fu-Ji Wang,Kui Li,Xin Cheng
Considering the flexibility, adjustable pore structure, and abundant active sites of metal–organic frameworks (MOFs), rational design and fine control of the MOF-based hetero-nanocrystals is a highly important and challenging subject. In this work, self-assembly of a 3D hollow BiOBr@Bi-MOF microsphere was fabricated through precisely controlled dissociation kinetics of the self-sacrificial template (BiOBr) for the first time, where the residual quantity of BiOBr and the formation of Bi-MOF were carefully regulated by changing the reaction time and the capability of coordination. Meanwhile, the hollow microstructure was formed in BiOBr@Bi-MOF through the Oswald ripening mechanism to separate photogenerated electron–hole pairs and increase the adsorption capacity of Bi-MOF for dyes, which significantly enhanced the photocatalytic degradation efficiency of RhB from 56.4% for BiOBr to 99.4% for the optimal BiOBr@Bi-MOF microsphere. This research broadens the selectivity of semiconductor/MOF hetero-nanocrystals with reasonable design and flexible synthesis.
研究领域:
材料科学
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纳米技术
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Muhua Chen,Shang Wei,Jiayi Wu,Jingrun Li,Bo Fu,Xinbao Zhu
Visible light driven antibiotic degradation with metal-organic frameworks (MOFs) has been regarded as a feasible and efficient approach. Herein, Bi-based MOF (CAU-17) was synthesized and used for tetracycline (TC) removal. To enhance the photocatalytic performance, sulfur (S) element was doped on CAU-17 through solvothermal process. Characterization results verified that S element was successfully doped on CAU-17 and distributed uniformly. The introduction of S element could boost the generation of oxygen vacancies and tune the band gap of CAU-17. By optimizing the S content, the band gap energy (E g ) of CAU-17–0.02 S sample (0.02 g thiourea was added during the synthesis) reduces from 3.57 to 3.37 eV compared to pristine CAU-17. In addition, the visible light response was enhanced and the charge transfer resistance was reduced. TC removal tests demonstrated that CAU-17–0.02 S exhibited a removal efficiency of 62.9%, and the degradation rate constant is 1.44 times than that of bare CAU-17. Reactive species trapping experiment indicated h + ,·OH and·O 2 - all promoted the degradation of TC, following the order of h + >·OH> ·O 2 - . Moreover, CAU-17–0 . 02 S presented a good reusability with slight performance loss after four cycles.
研究领域:
环境科学
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材料科学
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光催化
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水处理
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2024
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IF 4.4
Qianqian Chen,Yuancai Lv,Junjie Pan,Weihan Chen,Gengwu Zhou,Xiaobing Yang,Kejun Cheng
Antibiotics, particularly tetracycline (TC), are extensively used in medicine, agriculture, animal husbandry, and the food industry due to their bacteriostatic and antibacterial properties. However, the widespread use of antibiotics has led to serious consequences, particularly in the form of water pollution and the emergence of numerous antibiotic-resistant microorganisms. Therefore, it is essential to implement effective measures to mitigate these environmental impacts. In this paper, we introduce a novel BiOCl@Bi-carbon heterojunction derived from Bi-MOF. The synthesized samples were thoroughly characterized through various techniques. The results demonstrate that BiOCl was successfully synthesized on the surface of Bi-MOF via in situ transformation, and that Bi-MOF was converted into Bi-doped porous carbon (Bi-carbon) after high-temperature annealing treatment. The coupling of BiOCl with Bi-carbon significantly enhances the photocurrent density. The photocatalytic activity of the samples was effectively evaluated by measuring the degradation of TC, with BiOCl@Bi-carbon demonstrating the highest photocatalytic efficiency, achieving a degradation rate of 96.27 % for TC. Additionally, BiOCl@Bi-carbon exhibits excellent stability. Its outstanding photocatalytic performance indicates significant potential for practical applications. Furthermore, we analyze the mechanism underlying the photocatalytic degradation of TC at the end of the study.
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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光催化
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
·
IF 4.1
Liping Deng,Liangmei Rao,Xinyu Lu,Yutang Wang,Weiming Zhang,Xuemin Duan,Yangping Wen,Zhuohua Kong,Jingkun Xu
The accumulation of heavy metal cadmium (Cd) in the food chain poses a serious threat to human health, necessitating the development of rapid, on-site, and portable detection methods for Cd (II). Herein, we developed a smartphone-based electrochemical sensor for portable determination of Cd (II) in vegetables using a bismuth metal–organic framework (Bi-MOF) nanocomposite. Prismatic rod-like Bi-MOF was hydrothermally synthesized using trimesic acid as organic ligands, and subsequently, carboxyl-functionalized multi-walled carbon nanotubes (COOH-MWCNTs) were incorporated to form Bi-MOF nanocomposite network. The smartphone-based electrochemical sensor enables rapid, sensitive, and portable detection of Cd (II) in vegetable samples using Bi-MOF/COOH-MWCNTs-modified screen-printed carbon electrodes (SPCE). A comparative analysis of traditional electrochemical sensors coupled with desktop computer for linear voltametric responses for Cd (II) in the range of 0.2–500 ng/mL with a limit of detection (LOD) of 0.07 ng/mL using Bi-MOF/COOH-MWCNTs-modified glassy carbon electrodes (GCE), the portable sensor demonstrated good linear range in 0.7–350 ng/mL with a LOD of 0.22 ng/mL. This work introduces a novel approach for on-site and portable detection of Cd (II) in agricultural products.
研究领域:
环境科学
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分析化学
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材料科学
·
食品安全
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Wenxiu Gu,Qian Li,Haiyan Zhu,Luyi Zou
The self-assembled Bi-based metal–organic framework microspheres (Bi-MOF-M) by nanorods were successfully constructed by the glycol-assisted solvothermal method . Using Bi-MOF-M as a homologous template, a petal-like Bi 2 MoO 6 (BMO) layer was grown in situ on its surface to facilely construct a chemically bonded heterojunction interface, realizing a micro/nano hierarchical flower spherical-like Bi-MOF-M/BMO heterojunction composite photocatalyst . The as-prepared series of Bi-MOF-M/BMO- x catalysts show higher visible light catalytic performance for tetracycline hydrochloride (TC) degradation. Among them, Bi-MOF-M/BMO-0.3 has the optimal catalytic activity, and the degradation efficiency can reach 93.6% within 60 min of light irradiation with superior mineralization ability and structural stability , and the degradation kinetic constant is 6.12 times that of Bi-MOF-M and 5.69 times that of BMO, respectively. The homologously grown Bi-MOF-M/BMO chemically bonded heterojunction not only effectively broadens the spectral absorption range and enhances the absorption intensity but also promotes the efficient separation of photogenerated carriers through forming a favorable interfacial electric field and well-matched energy band alignment. A reasonable mechanism for the visible light degradation of TC by the Bi-MOF-M/BMO composite catalyst with h + and 1 O 2 as the main reactive species is proposed. The micro/nano hierarchical structure of the Bi-MOF/BMO catalyst allows it to exhibit the easy recovery advantage of micron-scale materials while maintaining the high catalytic activity of the primary nano-components.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）