ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
·
2022
·Vol. 238
·期 1
·13-14
·
IF 0.365
Zhihong Zhu,Lilei Zhang
C 14 H 12 BrClN 2 O, monoclinic, P 2 1 / c (no. 14), a = 13.4072(6) Å, b = 8.6103(5) Å, c = 12.3824(6) Å, β = 100.475(4), V = 1405.60(12) Å 3 , Z = 4, R gt
( F ) = 0.0499, wR ref
( F
2 ) = 0.1215, T = 173 K.
研究领域:
化学
·
晶体学
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DOI
高影响因子
Environmental Science-Water Research & Technology
·
2024
·
IF 3.5
Fan Bai,Zongping Wang,Guodong Wan,Lisan Cao,Yujie Cheng,Zhenbin Chen,Pengchao Xie
In this study, Fe(III)/sulfite (S(IV)) system was used to treat two actual water samples including a lake water sample and a secondary sedimentation tank effluent sample containing tribromophenol (TBP) with combined pre-oxidation and coagulation process. This process not only efficiently removed TBP but also facilitated the removal of background organic compounds. The treatment efficiency increased with the increased S(IV) addition times. The results from scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) showed that the in-situ generated flocs in the Fe(III)/S(IV) system exhibited enhanced specific surface area, adsorption capacity, and coagulation properties compared to those produced in single Fe(III) coagulation, with generating more Fe3O4 particles. The treatment efficiencies of TBP and background organic materials initially rose and then fell with an increase in S(IV) dosage. Moderately incrementing Fe(III) dosage also boosted the removal of TBP and background organic substances, whereas excessive Fe(III) dosage provided limited additional benefits. In the selected pH range of 3-8, good removal of turbidity could be always achieved, and the best removal of TBP and background organic substances was found at pH 4. Overall, this study indicated that the Fe(III)/S(IV) system with combined pre-oxidation and coagulation process would be an effective treatment strategy for aquatic organic micropollutants.
研究领域:
环境科学
·
水处理技术
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 3
·1095-1109
·
IF 3.134
Deng Renjie,Zeng Manlin,Tian Yao
A novel heterogeneous catalytic system was developed for the preparation of para -nitrobromobenzene ( p -NBr) with nitrogen dioxide (NO 2 ) as nitrating agent in the presence of oxygen (O 2 ). By applying Hβ zeolite as the catalyst, p -NBr can be obtained with high conversion (85.7%) and selectivity (91.7%). In addition, it can be recycled at least five times without a significant decrease in catalytic activity, which demonstrates its high efficiency, good stability and regenerability. Meanwhile, DFT study explained the regioselectivity for the nitronium (NO 2 + ) nitration via electrophilic process, which support the experimental conclusion. Graphical abstract
研究领域:
催化
·
有机化学
·
理论化学
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DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Kunlin Liu,Jiuzhou Wang,Ting Yang,Hong Wang,Chengyang Wang,Mingming Chen
Traditional synthesis methods of mesoporous carbon include hard templates (e.g., metal oxides , metal salts and mesoporous silica) and soft templates (e.g., surfactant and block copolymer). However, complicated and time-consuming procedures, high template costs, and harsh preparation conditions hinder the scale-up of these methods. Here, we report a simple and bottom-up strategy to synthesize mesoporous carbon by using the sodium-assisted carbonization of bromobenzene without additional templates added. Depending on the pyrolysis temperature, the obtained material with nanorod structures has a high surface area of 1902 m 2 g −1 , a large pore volume of 1.21 cm 3 g −1 and a high degree of graphitization . Meanwhile, the pore-forming mechanism of this strategy is explored and attributed to the “ in situ templating” effect of NaBr. The resultant material at 800 °C shows considerable rate performance, long lifetime and high power density. Additionally, the versatility and feasibility of the technique are validated via carbonization of six halogenated aromatic hydrocarbons by three alkali metals . Compared with lithium and potassium , sodium has better pore-forming effect and the obtained products possess a high surface area (1450–2100 m 2 g −1 ) and a large pore volume (1.1–1.6 cm 3 g −1 ). Furthermore, these mesoporous carbons show high adsorption capacity on dye macromolecules.
研究领域:
材料科学
·
能源存储
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2016
·Vol. 39
·期 8
·1445-1450
·
IF 2.385
Qiulin Deng,Ruwei Shen,Rong Ding,Lixiong Zhang
2,4,5-Trifluorobromobenzene is a valuable intermediate with important application in the synthesis of biologically active peptides and fluorescent reagents. A continuous-flow system has been successfully developed for the synthesis of 2,4,5-trifluorobromobenzene in a microreactor using FeBr 3 as a catalyst, which is steadily generated in situ from the reaction of Br 2 and Fe. The procedure is efficient and easy-to-handle, and 2,4,5-trifluorobromobenzene can be obtained within minutes in high yields.
研究领域:
有机化学
·
合成化学
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DOI
高影响因子
WATER AND ENVIRONMENT JOURNAL
·
2023
·Vol. 37
·期 4
·792-803
·
IF 2
Xia Zhao,Bowen Li,Guozhen Zhang,Yumin Xu,Weina Pei,Hao Wang
A microbial electrolysis cell was established to explore the degradation characteristics of characteristic pollutants in wastewater for parabromoaniline (P-BrA). Their effects on P-BrA reduction and degradation were investigated through factors such as impressed voltage and cosubstrate type. The P-BrA residue and degradation in wastewater were analysed quantitatively through analytical testing methods, such as ultraviolet–visible, cyclic voltammetry, high-performance liquid chromatograph, and scanning electron microscopy. The results showed that under the cathode potential of 0.5 V, electrons and electroactive microorganisms generate coupling action to accelerate the degradation of P-BrA, reaching 94.94%. Moreover, the addition of carbon source organisms, such as glucose and sodium acetate, can facilitate the degradation of P-BrA in the cathode chamber on the precondition that the electroactive anaerobic microbial C/N ratio was satisfied, both reaching over 90%. In addition, the microbial community diversity and richness of bioelectrochemistry system were enhanced after bioaugmentation. The increase in the Anacrolincalcs , Betaproteobacteriales , and Micrococcales also played an important role in the granulation of bioelectrochemistry system and the removal of characteristic pollutants.
研究领域:
环境科学
·
微生物学
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产品关联
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 3.7
Qian Gui,Hai-Min Zhang,Feng Qian,Han-Yu Liu,Xiang-Xin Kong,Guo-Ying Lv,Pu Wang
Asymmetric synthesis of chiral alcohols by biocatalysts holds promising prospect. In this study, a medicinal Cordyceps fungus, namely Tolypocladium inflatum , was adopted as a novel biocatalyst for the synthesis of chiral alcohols. Among the assessed prochiral ketone substrates, T. inflatum exhibited the best catalytic activity towards 1-(4-bromophenyl)−2,2,2-trifluoroethanone (BPFO), yielding a valuable pharmaceutical intermediate ( S )−1-(4-bromophenyl)−2,2,2-trifluoroethanol (( S )-BPFL) with >99.9 % enantiomeric excesses (ee). For more efficient biosynthesis of ( S )-BPFL, cyclodextrins or surfactants were introduced to the reaction system as additives to strengthen this bioprocess. Among which methyl β-cyclodextrin (MCD) improved cell membrane permeability and alleviated product inhibition, while Triton X-100 enhanced BPFO solubility. Furthermore, synergistic promotion for BPFO bioreduction by MCD and Triton X-100 was observed. Under the optimal reaction conditions, 50 mM BPFO was converted into ( S )-BPFL with 89.1 % yield and >99.9 % ee in 12 h, showing 16-fold increase of space-time yield in the developed MCD/Triton X-100-buffer system compared to neat buffer solution. This study illustrated the potential of the enantioselective preparation of chiral alcohols mediated by Cordyceps fungus. Additionally, the biocatalytic efficiency was significantly improved in the constructed synergistic reaction system, and the underlying mechanism was also explored.
研究领域:
生物催化
·
有机化学
·
药物化学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Water Research & Technology
·
2024
·
IF 3.5
Fan Bai,ye liu,Yujie Cheng,Yingqing Guo,Zhenbin Chen,Lisan Cao,Zongping Wang,Pengchao Xie
2,4,6-tribromophenol (TBP) is widely distributed in environmental media, posing potential risks to human health and ecological systems. The efficient treatment of TBP-contaminated water is a significant challenge. In this study, a combined process of oxidation and coagulation using Fe(III)/CaSO3 was employed to treat actual water samples spiked with TBP. The slow release of S(IV) from CaSO3 into the solution benefited the treatment efficiency, and the Fe(III)/CaSO3 system not only effectively removed TBP but also significantly enhanced the removal of background organic compounds via oxidation and coagulation. The optimal water quality was achieved with Fe(III) and CaSO3 dosages of 100 μM and 400 μM, respectively, with an initial pH of 3.5. As for the Fe(III)/CaSO3 system, larger-sized crystals were observed after treating the secondary clarifier effluent compared to that in the sole Fe(III) coagulation process. Further coagulation after Fe(III)/CaSO3 oxidation offers a new approach to apply activated S(IV)-based advanced oxidation technologies in the field of water treatment, demonstrating its potential in the effective treatment of TBP in water.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2011
·Vol. 22
·期 12
·1497-1500
·
IF 0.775
Xiao Zheng Lan,Hai Rong Pei,Chuan Xian Cheng
Phase behavior of binary system of bromobenzene–chlorobenzene (C 6 H 5 Br–C 6 H 5 Cl) confined in SBA-15 and MCM-41 (pore diameter 8 nm, 3.8 nm, respectively) has been investigated by means of differential scanning calorimetry (DSC). Phase diagram of C 6 H 5 Br–C 6 H 5 Cl system confined in SBA-15 is a type of the complete miscible both in liquid and solid state, the same phase behavior as the bulk system. However, the phase diagram comprises only one boundary line, which is shifted down 22–36 K with respect to the bulk system. C 6 H 5 Br, C 6 H 5 Cl or the mixture within nanopores of MCM-41 is nonfreezing. The different phase behavior of the system confined in SBA-15 and MCM-41 is thought mainly due to the relative size of pore to molecule.
研究领域:
物理化学
·
材料科学
·
纳米科技
·
热力学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Yuzhu Li,Jiajun Yang,Lai Xie,Yu Li,Xiwen Liang,Xubing Lu,Xingsen Gao,Jinwei Gao,Lingling Shui,Sujuan Wu,Jun-Ming Liu
In this work, 4-bromoaniline (BrAL) is employed to modify the CsPbI2Br/carbon electrode interface to passivate defects of all-inorganic CsPbI2Br perovskite solar cells (PSCs). The effects of BrAL modification on the structure, light absorption, and trap-state density (Ntrap) of CsPbI2Br films and the carrier recombination process, photoelectrical characteristics, and air stability of the PSCs are systematically studied. The results show that the hydrophobic BrAL interlayer modification can lead to a better matched energy-level alignment, reduce the Ntrap to construct uniform CsPbI2Br films, and suppress carrier recombination to promote charge transport and collection. Thus, the modified PSC achieves a higher power conversion efficiency (PCE) of 11.34% with less hysteresis (reference-PSC, 9.50%) and better stability in ambient air. The BrAL passivation provides a good strategy to enhance the photoelectrical performance and air stability of all-inorganic PSCs.
研究领域:
材料科学
·
能源技术
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产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2012
·Vol. 12
·期 1
·179-186
·
IF 1.563
Li Yijing,Miao Xinrui,Liu Gang,Li Zhuomin,Xu Li,Deng Wenli
The self-assemblies of four compounds, 1-bromo-4-(hexadecyloxy)benzene (BHB-16), 1-bromo-4-(octadecyloxy)benzene (BOB-18), 1-bromo-4-(pentadecyloxy)benzene (BPB-15) and 1,4-dibromo-2,5-(dioctadecyloxy)benzene (DDB-18), have been studied on highly oriented pyrolytic graphite (HOPG) under
ambient conditions by scanning tunneling microscopy (STM), with the aim of understanding the influence of the molecular structure and functional groups on the arrangements. It is found that the bromine atoms of the four molecules are in bright contrast and can be identified in STM images.
The neighbouring phenyl head groups of the BHB-16, BOB-18 and BPB-15 molecules in one lamella, with an anti-parallel orientation, are interdigitated with different offset distance, while the aromatic cores of DDB-18 molecules in the same row are in a parallel orientation. Moreover,
an odd-even effect is observed in the self-assemblies of the former three molecules as expected. The STM images of the four molecules resemble the calculated HOMO electron density contours somewhat with positive surface bias voltage. On the basis of comparative analysis between the STM images,
it is suggested that the electrostatic attractions between the neighbouring molecules play an important role in the self-assemblies of BHB-16, BOB-18 and BPB-15, while it is the van der Waals force and the non-covalent halogen–halogen interaction that dominate the structure of DDB-18
adlayer.
研究领域:
材料科学
·
表面科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Pengrui Zhang,Ciming Wang,Zixuan Xue,Lianjing Mao,Jinhe Sun,Fei Shao,Mixiang Qi,Yan Jing,Yongzhong Jia
Controlled fusion energy is considered to be one kind of sustainable energy source with clean and green properties. The fusion process requires a large number of lithium isotopes, but the naturally stable lithium isotopes 6 Li and 7 Li cannot be directly applied to the fusion process and must be further enriched. In this paper, a system for the separation of lithium isotopes by extraction was investigated, which mainly consists of bromobenzene-15-crown-5 and ionic liquids. The effects of ionic liquids, lithium salts, crown ether concentration, and temperature on the separation performance of lithium isotopes were explored. It was found that 6 Li was enriched in the organic phase and the single-stage separation factor reached 1.032. It was proved by the temperature experiment that the exchange of lithium isotopes was a spontaneous and exothermic process. The complexation ratio of crown ether and lithium ions was 1:1. The optimized complexation model and the interaction of crown ether and lithium ions were calculated by DFT and Multiwfn. Lithium ions were weakly bonded to the crown ether and strongly bonded to the water molecule as demonstrated by the non-bonded interactions and Mayer bond order of Li-O. Meanwhile, the mechanism of lithium isotope separation with crown ether was clarified by mutual verification of experiment and theoretical calculations.
研究领域:
核科学
·
物理化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）