VACUUM
·
2024
·
IF 3.8
Kaiting Yang,Xiongtao Lv,Jingwen Meng,Huiqing Wang,Lin Guo,Xin Li,Fengyun Su,Qing Lan,Zhengdao Li,Wei Wang,Yuwei Guo,Xiaoli Jin,Haiquan Xie
Photothermal catalytic reduction of CO 2 into high value-added C 2 hydrocarbon products is a promising method for efficient CO 2 conversion. However, current photocatalysts still encounter obstacles including limited photoabsorption range, rapid recombination of photogenerated carriers , and inadequate surface active sites. Herein, Bi 4 O 5 Br 2 co-modified with oxygen vacancy (OV) and metal bismuth (Bi) (Bi 4 O 5 Br 2 -OV@Bi) has been prepared to optimize these crucial issues. Bi 4 O 5 Br 2 -OV@Bi delivers a remarkably improvement in CO 2 photothermal conversion, reflecting by the notable increase in C 1 (CO and CH 4 ) and newly generated C 2 (C 2 H 4 and C 2 H 6 ) products compared to pristine Bi 4 O 5 Br 2 . In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) spectrometry reveals that OC−COH* intermediate promotes the C–C coupling for produce C 2 hydrocarbons. This study strengthens the understanding of metal modification and defect engineering for forming C 2 hydrocarbons on bismuth-based photocatalysts .
研究领域:
材料科学
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环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 52
·期 2
·476-486
·
IF 4.569
Junlei Wang,Kuan Wang,Zhen-Hong He,Tong Sun,Run-Jing You,Jian-Gang Chen,Weitao Wang,Yang Yang,Zhao-Tie Liu
Oxygen-containing organics, which are generated from the selective oxidation of their corresponding hydrocarbons, have high value in the chemical and pharmaceutical industries. However, their oxidation reactions are very challenging as the products are more active than the substrates, especially for the oxidation of cyclohexane (CHA). Herein, we focused on the one-step preparation of Bi2WO6 with double active sites of tunable metallic Bi and oxygen vacancies (OV–Bi/Bi2WO6) by a facile solvothermal treatment. Then, OV–Bi/Bi2WO6 was used as an efficient photocatalyst for the partial oxidation of CHA to cyclohexanone (CHA-one) for the first time in air as an oxidant under solvent-free and room temperature conditions. The Bi : Bi2WO6 ratio in the as-prepared OV–Bi/Bi2WO6 heterojunction could be tailored from 0.08 to 8.43 by controlling the solvothermal temperature, and the synergistic effect between DMF and EG could increase the reduction of MDF/EG and promote the production of Bi. Moreover, OV–Bi/Bi2WO6-160 yielded 4.4 and 8.8 times more CHA-one (128.8 μmol) than pure Bi2WO6 and metallic Bi, respectively, and achieved 93.6% selectivity to CHA-one in air as an oxidant under solvent-free conditions. The results revealed that the highly enhanced photocatalytic activity was mainly attributed to the superior specific surface area, outstanding photo-absorption, abundant oxygen vacancies, and efficient electron–hole separation. Moreover, for the unique double active sites in OV–Bi/Bi2WO6, oxygen vacancies can enhance the adsorption and activation capacity of Bi2WO6 for O2, while metallic Bi can improve the adsorption and activation capacity of Bi2WO6 for CHA. Meanwhile, OV–Bi/Bi2WO6 also exhibited excellent durability due to the strong interaction between metallic Bi and Bi2WO6. The present work provides a flexible approach for tailoring the Bi : Bi2WO6 ratio and outlines an effective method for producing CHA-one from CHA under mild conditions.
研究领域:
材料科学
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催化化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Wei Jin,Shenghai Yang,Chaobo Tang,Yun Li,Cong Chang,Yongming Chen
Traditional bismuthinite concentrate precipitation smelting has problems of low recovery of valuable metals (e.g., Bi, Cu, Mo, and Ag), high fuel consumption, and high cost of SO2 flue gas treatment. Therefore, in this study, an eco-friendly alkaline smelting process was proposed to extract metallic bismuth and recover valuable metals. The phase equilibrium composition of the Bi2S3-Na2CO3-C system was revealed by thermodynamic simulations at different temperatures and reductant contents. Based on reaction product characterizations and thermodynamic simulations, the following reaction mechanism and suitable bismuth extraction path were confirmed: Bi2S3 first reacted with Na2CO3 to form Bi2O3 and Na2S, and the intermediate (Bi2O3) was then reduced to metallic Bi by both C and CO. Under optimized conditions (Wbismuthinite/WNa2CO3/Wcoke = 200:300:20, 900 °C, 150 min), up to 96.56% Bi, 75.07% Pb, and 85.11% Ag were enriched in crude bismuth, respectively, while 93.57% Cu, 70.23% Fe, 96.63% Mo, and 94.34% W entered the salt slag. More than 99.9% W and Mo were recovered as Na2WO4 and Na2MoO4, respectively, from the salt slag by water leaching. In the leaching residue, chalcopyrite, pyrite, and elemental sulfur could be recovered by flotation.
研究领域:
冶金学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Kuan Wang,Tong Sun,Hui Ma,Run-Jing You,Zhen-Hong He,Jian-Gang Chen,Huan Wang,Weitao Wang,Yang Yang,Lei Wang,Zhao-Tie Liu
The conversion of CO 2 into chemicals with value-added can be achieved through the process of photocatalysis, which holds significant importance in the fields of energy and environmental sustainability. Herein, a unique S-scheme In 2 O 3 /Bi/BiOCl heterojunction nanoflower with abundant oxygen vacancies was fabricated by a self-assembly strategy, in which the introduction of In 2 O 3 could effectively regulate the in-situ growth of metal Bi and oxygen vacancy on the surface of BiOCl nanosheet. The nanoflower In 2 O 3 /Bi/BiOCl photocatalysts exhibited exceptional photocatalytic performance in the CO 2 reduction with H 2 O, ascribing to the synergistic effect of the unique S-scheme heterojunction, the surface plasmon resonance (SPR) effect of metal Bi, and oxygen vacancy engineering. Surprisingly, the In 2 O 3 /Bi/BiOCl-4 composites achieved 34.53 μmol⋅g −1 ⋅h −1 photoreduction efficiency of CO 2 -to-CO with high selectivity (97.5 %) and high stability, which was 3.12 times higher compared to the pure BiOCl. The S-scheme heterojunction of In 2 O 3 /Bi/BiOCl-4 nanoflower can promote carrier separation efficiency and improve light utilization. Meanwhile, the large specific surface area and abundant oxygen vacancies of the nanoflower with 3D/0D/2D structure self-assembly can provide more adsorption and active sites for CO 2 photocatalytic reaction. The SPR effect of the in-situ generated metal Bi can further enhance charge transfer to accelerate the photoreduction process of CO 2 . The present study provides a novel approach for the in-situ construction of S-scheme heterojunction photocatalysts with SPR effect and oxygen vacancies to pursue efficient photocatalytic CO 2 reduction in the water phase
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2020
·
IF 4.333
Min Li,Ying Li
The conversion of solid Bi 2 O 3 to bismuth in a urea–1-methylimidazolium trifluoromethylsulfonate (urea–MIMTfO) electrolyte is studied for the first time. The electrochemical reduction behavior of solid Bi 2 O 3 was studied using a home-made graphite cavity working electrode. Cyclic voltammetry of the graphite cavity electrode confirms that solid Bi 2 O 3 is converted to metallic bismuth via a one-step process. Electrolysis experiments were carried out under constant voltages of 2.4 V, 2.6 V, and 2.8 V for various periods of time. Experimental results indicate that the urea–MIMTfO solution is a useful electrolyte for the electrochemical conversion of solid Bi 2 O 3 to metallic bismuth. This approach offers a green and straightforward method for the conversion of oxides to metals.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Hong Zhang,Qian Du,Xin Du,Zhanglian Xu,Shaoqiang Guo,Wentao Zhou
The electrorefining of spent nuclear fuels in a molten LiCl-KCl salt electrolyte recovers the valuable actinides but also releases radioactive fission products in the salt. To minimize the nuclear waste volume, dissolved fission products such as rare earths (REs) must be removed from the electrorefining salt and immobilized into proper wasteforms. Here we propose a two-step approach for treating the electrorefining waste salt by (i) the electrolytic recovery of REs from the salt using a liquid metal cathode; and subsequent (ii) oxidative extraction of REs from the liquid metal into durable wasteforms. Experimental demonstration using rare earth element samarium (Sm) and liquid metal (Bi) was successful. The Sm ions dissolved in the salt can be selectively recovered as dendrite Sm-Bi intermetallic products on the top of liquid bismuth cathode through electrolysis at appropriate applied currents or potentials. Then the Sm in the Sm-Bi alloy was efficiently extracted into both zinc-in-titania (ZIT) glass ceramic and lanthanide aluminoborosilicate (LABS) glass wasteforms through selective oxidation at Sm 2 O 3 loadings of 18–25 wt% and 50 wt%, respectively. Recycling of the electrorefining salt with minimum nuclear waste generation is foreseeable with the use of this simple, efficient, and highly compatible process.
研究领域:
核化学与技术
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Chunxin Xu,Yi Wang,Wanjun Li,Dunfeng Gao,Guoxiong Wang,Rui Cai
Renewable energy-driven electrocatalytic CO2 reduction reaction (CO2RR) over bismuth-based catalysts shows great promise for converting CO2 into formic acid and formate while closing the carbon cycle. Herein, we report a high-performance BiFeO3/Bi25FeO40 precatalyst, which delivers a formate partial current density of 359.8 mA cm–2 and a formate formation rate of 6.71 mmol h–1 cm–2 in a flow cell at −0.75 V versus reversible hydrogen electrode (vs RHE). Furthermore, it shows stable formate production for 88 h at −0.64 V vs RHE with a total current density of 160 mA cm–2. The impressive electrocatalytic performance toward CO2RR to formate is likely ascribed to the synergistic effect of single Bi atoms and bimetallic BiFe nanoparticles present in close proximity after in situ electrochemical reconstruction of the BiFeO3/Bi25FeO40 precatalyst. This work presents new insights into the development of highly efficient Bi-based catalysts for the CO2RR.
研究领域:
化学
·
材料科学
·
电化学
·
可再生能源
·
催化
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Wensheng Xie,Jielin Ye,Zhenhu Guo,Jingsong Lu,Xiaohan Gao,Yen Wei,Lingyun Zhao
Low-dose radioresistance continues to be one of the major limitations for clinical curative treatment of cancer. Luckily, nanotechnology mediated by multifunctional nanomaterials provides potential opportunity to relieve the radioresistance via increasing the radiosensitivity of cancer cells. Herein, an ultrafast fabrication strategy is reported to prepare iron/manganese co-doped bismuth trimetallic nanoparticles (pFMBi NPs) as a multifunctional radiosensitizer for combined therapy. The bismuth matrix provides the intrinsic radiosensitization effect under the low and safe radiation dose via Auger electrons, photoelectrons, and Rayleigh scattering. Meanwhile, co-doping of iron and manganese ions endows pFMBi NPs with both the Fenton reaction property for reactive oxygen species (ROS) generation and photothermal conversion performance for heat production. Additional ROS generation enhances the radiosensitization effect by collaborating with Rayleigh scattering-mediated water radiolysis, and endogenous heat production under near-infrared 808 nm laser irradiation makes DNA more sensitive to radiation and ROS damage. Both in vitro and in vivo evaluations demonstrate the effective antitumor and radiosensitization effects via thermally aided chemodynamic/radiotreatment with a low radiation dose (6 Gy). Therefore, this work provides a potential strategy for overcoming the low-dose radioresistance in cancer therapy.
研究领域:
纳米技术
·
放射肿瘤学
·
癌症治疗
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）