CHEMOSPHERE
·
2018
·
IF 4.427
Huafeng Li,Jin Wang,Rui Wang,Kaibo Huang,Wanying Luo,Xueqin Tao,Zhi Dang,Hua Yin,Chuling Guo,Guining Lu
Polybrominated diphenyl ethers (PBDEs) belong to a class of persistent organic pollutants (POPs), with potential toxicity to the liver, reproductive system, and development of mammals. The highly toxic and concentrated congener, 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47), was chosen to investigate debromination mechanisms by the two synthetic iron-based bimetals (Pd/Fe 0 and Cu/Fe 0 ) in two protic solvents (water and ethanol). SEM, XPS, and BET analyses showed that the synthetic bimetals Pd/Fe 0 and Cu/Fe 0 were spherical with diameters of about 100 nm and loaded with ∼1% (wt%) of Pd and Cu, respectively. GC-MS was used for the analysis of degradation products and the chromatograms showed that both Pd/Fe 0 and Cu/Fe 0 bimetals had effective reducing properties in water solvent. In ethanol solvent, debromination of BDE-47 by Pd/Fe 0 showed a similar high activity, but BDE-47 could be hardly degraded by Cu/Fe 0 . The dominant debromination products of BDE-47 by Pd/Fe 0 and Cu/Fe 0 were ortho -substituted and para -substituted BDEs, respectively. Active H-atomic transfer was found to play a key role in the debromination of BDE-47 by Pd/Fe 0 in both, water and ethanol, with a preference for para -debromination along with the formation of dibenzo-p-furan (DF) as the by-product, mainly in water. In contrast, electron transfer with a preference for ortho -debromination was found to play a predominant role for Cu/Fe 0 system in water. More importance should be provided to active H-atomic transfer for its high efficiency. In-depth study on the mechanism of formation of by-product DF would be significant for its higher toxicity, possibility of accumulation and migration in the environment.
研究领域:
环境科学
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毒理学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Jingjing Cai,Huijun Liu,Yulin Luo,Yuqing Xiong,Lizhu Zhang,Sheng Wang,Kang Xiao,Zhao-Qing Liu
Bimetallic sulfides, integrating the merits of individual components, are ideal structures for efficient electrocatalysis. However, for bimetallic sulfides including metal sulfide heterojunctions (MSH) and single-phase bimetallic sulfides (SBS), it is still unclear about which one has better catalytic activity toward reversible oxygen catalysis and its difference on catalytic mechanism. In this work, we demonstrate a bimetallic sulfide electrocatalyst that could transform from metal sulfide heterojunction (CoS/FeS) to single-phase bimetallic sulfide (CoFeS 2 ) through a facile temperature control strategy. The single-phase bimetallic sulfide (CoFeS 2 ) affords high intrinsic activity, fast reaction kinetics and superior durability toward oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Density functional theory (DFT) simulations reveal that the (CoFeS 2 ) has homogeneous electron distribution of the CoFeS 2 structure, improves the central energy level of d band, and optimizes the O* and OOH* intermediate and efficiently reduces the energy barrier of the reaction rate-determining step (RDS). The assembled rechargeable zinc-air battery is more stable than the Pt/C and IrO 2 assemblies due to the excellent electrocatalytic activity and stability of CoFeS 2 /NC, suggesting that it has potential for use in practical applications.
研究领域:
材料科学
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电化学
·
理论计算
✓ 已验证
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 18
·4026
·
IF 3.057
Shasha Zhang,Wenxin Ji,Ning Feng,Liping Lan,Yuanyuan Li,Yulong Ma
In this study, a Rh(I)/Ru(III) catalyst with a bimetallic space structure was designed and synthesized. The interaction between the metals of the bimetallic catalyst and the structure of the bridged dimer can effectively reduce the steric hindrance effect and help speed up the reaction rate while ensuring the stability of the catalyst. X-ray photoelectron spectroscopy (XPS) results show that rhodium accepts electrons from chlorine, thereby increasing the electron-rich nature of rhodium and improving the catalytic activity. This promotes the nucleophilic reaction of the catalyst with methyl iodide and reduces the reaction energy barrier. The methanol carbonylation performance of the Rh/Ru catalyst was evaluated, and the results show that the conversion rate of methyl acetate and the yield of acetic acid are 96.0% under certain conditions. Furthermore, during the catalysis, no precipitate is formed and the amount of water is greatly reduced. It can be seen that the catalyst has good stability and activity.Keywords:carbonylation;acetic acid;bimetallic catalyst
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jingwei Huang,Wei Luo,Xiaoli Yuan,Jing Wang
In this work, bimetallic NiCo-MOF was fabricated on BiVO 4 by method of electrostatic attraction and then calcined to prepare Ni x Co 1−x O/BiVO 4 composite photoanode. The obtained Ni x Co 1−x O with high porosity and surface area showed excellent oxygen evolution performance. It is found that Ni x Co 1−x O acting as a strong hole extraction increases the rate of surface water oxidation by promoting charge separation efficiency. As a result, this composite photoanode can provide a photocurrent of 3.2 mA/cm 2 at 1.23 V vs RHE (0.5 M Na 2 SO 4 , AM 1.5 G illumination), far larger than that of pure BiVO 4 photoanode. The enhanced performance can be ascribed to synergistic effect between Ni and Co, which plays an important role for boosting water oxidation.
研究领域:
材料科学
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Yun Tian,Jie Qu,Kejia Wu,Mengqiao Gao,Jinxing Long,Qiang Zeng,Wei Qi,Xuehui Li
Conversion of lignin to value-added chemicals with endogenous hydrogen is of great significance but highly challengeable. In this work, an external hydrogen-free strategy has been proposed for aqueous transfer hydrogenolysis of lignin launched by the chemo-splitting of water using a series of Ni-Co bimetallic catalysts. With Ni 0.2 Co 0.1 -MgAl-LDO, 82.7 % of lignin conversion was achieved, affording a 20.8 % yield of monophenols, and 62.0 % of which was identified as 4-ethylphenol (yield of 12.9 %). Further investigations demonstrated that the lignin hydrogenolysis was triggered by the water splitting, and enhanced by the tandem demethoxylation and subsequent aqueous reforming reaction. Intensive characterizations using TEM, XPS and XAFS, etc, illustrated that the formation of highly dispersed Ni-Co alloy nanoparticles exhibited a strong metal-support interaction with MgAl-LDO. The electronic transfer effect between Ni and Co components and the strong basic sites are responsible for its excellent catalytic performance of Ni 0.2 Co 0.1 -MgAl-LDO on the lignin hydrogenolysis. Therefore, this work provides novel insight into the catalytic transfer hydrogenolysis of lignin.
研究领域:
催化化学
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生物质转化
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绿色能源
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有机反应工程
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材料化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 52
·33716-33724
·
IF 4.036
Jie Hu,Lei Li,Hao Li,Ying Zhai,Fushun Tang,Zhe Zhang,Banglin Chen
The mixed bimetal metal–organic framework Ni0.37Co0.63-MOF-74 has been constructed by the solvothermal method for NO adsorption. The results showed that bimetal Ni0.37Co0.63-MOF-74 takes up NO with a capacity of up to 174.3 cc g−1 under ambient conditions, which is 16.3% higher than that of the best single metal Co-MOF-74. The IAST adsorption selectivity for a NO/CO2 binary mixture can reach a maximum of 710 at low adsorption partial pressure, while the regeneration performance can be retained even after five cyclic adsorption–desorption experiments. Its separation performance was further confirmed by breakthrough experiments, indicating this new bimetal Ni0.37Co0.63-MOF-74 as one of the best materials for NO adsorption and separation in flue gas.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Hui Dong,Linlin Zheng,Zhenlong Jiang,Tao Wang,Xinyue Li,Yangyang Ma,Zhu Chang,Xuechuan Lv,Xiaohan Gao,Maotian Xu,Yanli Zhou
Maltol (MA) is a common additive used in many fields, and its detection is of great importance to human health. Here, we synthesized a bimetallic MOF (CuNiMOF) based on graphite paper by a fast, simple, and green electrodeposition method. Then, we constructed a self-calibrated MOF to detect maltol. CuNiMOF was based on graphite paper by a fast, simple, and green electrodeposition method, and then constructed a self-calibrated flexible biosensor for the detection of maltol. In this work, we utilized the amperometric i-t curve (IT), cyclic voltammetry (CV), and multipotential step (STEP) methods to electrosynthesize three modified electrodes (Gp/CuNiMOF/IT, Gp/CuNiMOF/CV, Gp/CuNiMOF/STEP). The MA was characterized by differential pulse voltammetry electrochemical reactions on the electrode surface were investigated. The results showed that compared with the other two electrodeposition processes, the IT method was used to the sensor prepared by the IT method exhibits superior performance compared to the other two electrodeposition processes. The nonlinear response of the sensor to MA was in the concentration range of 0.5 ∼ 450 μM with a detection limit of 0.17 μM.
研究领域:
分析化学
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材料科学
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电化学传感器
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Xiaoli Yang,Zelin Li,Mingyu Guo,Tao Zhao,Xiong Su,Wei Jiang,Guangting Han,Haoxi Ben
One-pot catalytic conversion of cellulose to ethylene glycol (EG) provides an efficient way toward the production of high value-added chemicals from the abundant biomass resource. However, control of product selectivity is a challenge due to the thermal instabilities of cellulose derived sugars. Here, a series of multifunctional NiCu/WO 3 catalysts were prepared and applied to this process. By tuning the metal ratio and WO 3 content, a high EG selectivity of 58.9% was obtained. The selectivity of total diols even reached 83.9%. Besides, the catalyst revealed excellent performance in the conversion of raw biomass. Characterization results showed that the special catalyst structure of WO 3 -wrapped metal particles enabled the reaction to proceed in a well-defined sequence and also facilitated the formation of NiCu-WO x-1 -O(H) interfacial sites. These interfacial sites offered high activity for the C C bond cleavage to produce glycolaldehyde from glucose. An appropriate amount of each active site ensured a well-synergistic effect of C C cleavage and hydrogenation capabilities, thus resulting in the highly selective formation of EG.
研究领域:
催化化学
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生物质转化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ORGANOMETALLICS
·
2020
·
IF 3.804
Shuang Huang,Xi Hong,He-Zhen Cui,Bing Zhan,Zhi-Ming Li,Xiu-Feng Hou
Herein, an unprecedented bimetallic bis-NHC Cp*Ir complex 1 bearing 2-arylbenzo[d]oxazolyl and NHC ligands is reported. A significant increase in activity was observed for N-methylation of amines and reduction of aldehydes with MeOH catalyzed by 1 compared to the monometallic analogues (2–11). Under the optimal conditions, it showed to be highly effective in N-methylation of nitroarenes with MeOH as both C1 and H2 source. Substrates, including aromatic amines, ketones, and nitro compounds with various functional groups, can be well-tolerated. Mechanistic studies and DFT calculation highlight the significance of bimetallic centers cooperativity.
研究领域:
无机化学
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催化
·
有机金属化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Wei Liu,Ding Gu,Xiaogan Li
A novel chemiresistive-type sensor for detecting sub-ppm NO2 has been fabricated using AuPt bimetal-decorated SnSe2 microflowers, which was synthesized by the hydrothermal treatment followed by in situ chemical reduction of the bimetal precursors on the surface of the petals of the microflowers. The as-prepared sensor registers a superior performance in detection of sub-ppm concentration of NO2. Functionalized by the AuPt bimetal, the SnSe2 microflower-based sensor shows a response of approximately 4.62 to 8 ppm NO2 at 130 °C. It is significantly higher than those of the sensors using the pristine SnSe2 (∼2.29) and the modified SnSe2 samples by a single metal, either Au (∼3.03) or Pt (∼3.97). The sensor demonstrates excellent long-term stability, signal repeatability, and selectivity to some typical interfering gaseous species including ammonia, acetone, formaldehyde, ethanol, methanol, benzene, CO2, SO2, and CO. The remarkable improvement of the sensitive characteristics could be induced by the electronic and chemical sensitization and the synergistic effect of the AuPt bimetal. Density functional theory (DFT) is implemented to calculate the adsorption states of NO2 on the sensing materials and thus to possibly reveal the sensing mechanism. The significantly enhanced response of the SnSe2-based sensor decorated with AuPt bimetallic nanoparticles has been found to be possibly caused by the orbital hybridization of O, Au, and Pt atoms leading to the redistribution of electrons, which is beneficial for NO2 molecules to obtain more electrons from the composite material.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Han Bo-Ming,Zhang Hao-Rui,Gao Wen-Jie,He Xi-Wen,Li Wen-You,Zhang Yu-Kui
In this work, a dual-emission material based on lanthanide metals was synthesized and used as a ratio fluorescence sensor to respond to Hg 2+ and H 2 O 2 , respectively. Tb-BDC-NH 2 as a bimetal MOFs had double ligands and exhibited double fluorescence emission peaks at 550 nm and 450 nm. The two emission peaks of Tb-BDC-NH 2 can be quenched by Hg 2+ and H 2 O 2 respectively, forming a built-in calibration signal for ratio fluorescence detection. Based on the different detection conditions of the Hg 2+ and H 2 O 2 , the simultaneous detection of the two detection substances can be achieved with simple operation. This detection system had good stability and anti-interference ability. Under optimal conditions, the detection limit for Hg 2+ detection was 0.2 µM. Meanwhile, for the detection of H 2 O 2 , the detection limit was 11 µM and large linear ranges were obtained. Through actual sample testing, it had been proven that the ratio fluorescence sensor based on Tb-BDC-NH 2 had good application prospects. And the work also provided a new idea for double substances detection.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Jingyu Pang,Ruyan Xie,Sophie Chua,Yu Zou,Mingyu Tang,Fang Zhang,Fang Chai
A dual-mode colorimetric and fluorimetric probe was successfully established based on silver/copper bimetallic nanoparticles (AgCu-BNPs). The AgCu-BNPs were confirmed as individually bimetallic nanoparticles with a mean size of 7.7 ± 0.2 nm, as characterized by high resolution transmission electron microscopy. Intriguingly, the AgCu-BNPs possess both surface plasmon resonances (SPR) and fluorescence emission. AgCu-BNPs emanate bright blue fluorescence with optical emission centered at 442 nm with high quantum yield of 30.3%, and AgCu-BNPs were attenuated or even quenched by Hg 2+ via both static and dynamic quenching, coincidently accompanied by a visible color change, which endow AgCu-BNPs a unique utility as dual-mode colorimetric and fluorimetric probes. The detection limits as low as 89 nM and 9 nM were determined by dual-mode of AgCu-BNPs, respectively. The recovery rates in real samples were found to be 97.3–118.8%, and 89.5–112.7% by colorimetric and fluorescent methods separately, demonstrates the good environmental tolerance of the dual-mode probe.
研究领域:
分析化学
·
环境科学
·
纳米技术
✓ 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）