JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2013
·Vol. 299
·期 3
·1509-1515
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IF 1.467
Liu Zhen-feng,Wang Guo-lin,Dong Meng-jie,Jin Jian-wen,Li Jia-jun,Zhang Qian,Zhao Kui,Yang Shu-ye,Lin Xiang-tong
The preparation of 10-(2-[ 18 F]fluoroethoxy)-20( S )-camptothecin, a potential positron emission tomography tracer for the imaging of topoisomerase I in cancers, is described. 10-(2-[ 18 F]Fluoroethoxy)-20( S )-camptothecin was synthesized by the [ 18 F]fluoroalkylation of the corresponding hydroxy precursor molecule with 2-[ 18 F]fluoroethyl bromide ([ 18 F]FEtBr) in dimethylsulfoxide (DMSO) at 55 °C for 20 min; this was followed by purification using high performance liquid chromatography (HPLC) with a total preparation time of 60 min. The overall radiochemical yield was approximately 5.4–12 % (uncorrected), and the radiochemical purity was above 96 %.
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PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
·
2014
·Vol. 372
·期 2013
·
IF 2.864
Fei Jiao,Chong-an Di,Yimeng Sun,Peng Sheng,Wei Xu,Daoben Zhu
In this article, we put forward a simple method for the synthesis of thermoelectric (TE) composite materials. Both n- and p-type composites were obtained by ball-milling the insoluble and infusible metal coordination polymers with other polymer solutions. The particle size, film morphology and composition were characterized by dynamic light scattering, scanning electron microscopy, transmission electron microscopy and energy-dispersive X-ray spectroscopy. The TE properties of the drop-cast composite film were measured at different temperatures. An inkjet-printed flexible device was fabricated and the output voltage and short-circuit current at various hot-side temperatures (Thot) and temperature gradients (ΔT) were tested. The composite material not only highly maintained the TE properties of the pristine material but also greatly improved its processability. This method can be extended to other insoluble and infusible TE materials for solution-processed flexible TE devices.
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BIORESOURCE TECHNOLOGY
·
2014
·
IF 5.039
Yu-Cai He,Zhi-Cheng Tao,Xian Zhang,Zhen-Xing Yang,Jian-He Xu
An NADH-dependent reductase (CmCR) from Candida magnoliae was discovered by genome mining for carbonyl reductases. After CmCR was overexpressed in Escherichia coli BL21, a robust reductase-producing strain, recombinant E. coli CCZU-K14, was employed for the efficient synthesis of ethyl ( S )-4-chloro-3-hydroxybutanoate (( S )-CHBE) from the reduction of ethyl 4-chloro-3-oxobutanoate (COBE). After the optimization, the optimum reaction conditions were obtained. Notably, E. coli CCZU-K14 had broad substrate specificity in reducing both aliphatic and aromatic substrates, and excellent enantioselectivity of CCZU-K14 was observed for most of the tested substrates, resulting in chiral alcohols of over 99.9% ee . Moreover, COBE at a high concentration of (3000 mM) could be asymmetrically reduced to ( S )-CHBE in the high yield (>99.0%) and high enantiometric excess value (>99.9% ee ) after 14 h. Significantly, E. coli CCZU-K14 shows high potential in the industrial production of ( S )-CHBE and its derivatives (>99.9% ee ).
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SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Shenghong Yang,Jie Liu,Yu Chen,Jinxiu Guo,Lei Zhao,Xuan Wei,Xianglu Peng,Qiaosheng Pu
Rapid development of nanomaterials has extended a new horizon for sensitive and easy-to-use sensors. Robust determination of nitro-explosives with nano-sensors has attracted great attentions due to the increasing safety concern. In this work, strongly fluorescent polyacrylamide coated CdTe(S) quantum dots (CdTe(S)@PAM QDs) with good dispersity and stability have been prepared by a facile, effective and reliable photochemical method through simple one-step UV irradiation. The prepared QDs were systematically characterized and the results proved that the prepared material could be readily used for the sensitive and selective sensing of 2,4,6-trinitrotoluene (TNT). The influence of experimental conditions on the analytical performance was investigated. With a QD concentration of 3.13 μmol/L, the calibration curve of TNT was linear up to 0.48 μmol/L, and a LOD (S/N = 3) of 2.1 nmol/L was attained. In combination of simple analyte extraction, no interference was observed from common inorganic ions and organic substances. TNT in samples with complicated matrices was successfully determined. The standard addition recoveries obtained from water and soil samples were in a range of 93.2–106.3%.
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Advanced Sustainable Systems
·
2024
·Vol. 8
·期 12
·2400429
·
IF 6.5
Baoqian Yang,Xinru Wu,Zhengjie Su,Benjamin Kunkadma Insua,Pengkun Zhang,Dong-Hau Kuo,Lulu Gao,Xinde Bao,Dongfang Lu,Jinguo Lin,Xiaoyun Chen
V/S co-doped SnO 2 bimetal sulfur-oxides catalysts labeled as (Sn,V) 1- x (S,O) 2- y or (SnVSO) with heterovalent state and oxygen vacancy defect are prepared via a green and facile method. The presence of SnVSO in the heterovalent states of Sn 4+ /Sn 2+ and V 5+ /V 4+ facilitates the rapid transfer of the electrons. It improves the electronic charge lifetime, accelerating the efficiency of the catalytic reduction of pollutants. The V/S co-doped SnO 2 regulates the bandgap energy structure. The hydrazine adjusts the heterovalent metal states to reduce Sn 4+ to Sn 2+ and V 5+ to V 4+ . Also, it introduces oxygen vacancies to SnVSO to maintain the charge equilibrium and increase the active surface reactive sites, which enhance the catalytic activity. The SnVSO-3 prepared with 0.4 mL hydrazine exhibits excellent catalytic activity, which wholly reduces 20 ppm of 100 mL methyl orange (MO), rhodamine B (RhB), methylene blue (MB), hexavalent chromium (Cr 6+ ), and 4-nitrophenol (4-NP) within 6 min. In addition, the SnVSO-3 also has good stability after repeated 6 runs with a reduction efficiency of 96.8%. Therefore, the V/S co-doped SnO 2 sulfur oxide catalysts have a promising potential for reducing Cr 6+ and organic pollutants.
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Desalination and Water Treatment
·
2024
·
IF 1
Xiaoxia Chen,Yu Ma,Zhengjie Su,Xinxin Zhang,Jinguo Lin,Xiaoyun Chen
Herrin, the lignin extracted from Rice hull , Phyllostachys edulis , Cunninghamia lanceolata, and Populus tomentosa Carrière were used as a soft support to grow Ti-doped Bi 2 (O,S) 3 bimetal oxysulfide catalysts, labeled BT-Rh, BT-Pe, BT-Cl, and BT-Ptc, respectively. The catalytic reduction activity was investigated through the decolorization of methyl orange (MO), methylene blue (MB), and reduction of Cr(VI) solutions under dark. The lignin-supported BiTiOS improved crystallinity, decreased aggregate size, increased specific surface area, and enhanced electrochemical active sites, leading to improve electron transfer and accelerated reduction rates. The catalytic reduction activity of organic dyes and Cr(VI) was significantly improved with lignin-supported BiTiOS. The 5 mg BT-Pe catalyst completely reduced 100 mL of 50 ppm MO, MB, and Cr(VI) solutions in 6, 6, and 18 min, respectively, with the reaction kinetic rate of 0.6782, 1.090, and 0.1189 min −1 , and demonstrated good durability, maintaining a reduction rate of 95 % after six cycles. This work provides a feasible approach combining biomass/inorganic materials to treat industrial wastewater.
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INTERNATIONAL MICROBIOLOGY
·
2024
·
IF 2.3
Fidan Ozkan,Karipcin Ayse Doga,Köse Ayse Hamide,Anaz Ayse,Demirsoy Beyza Nur,Arslansoy Nuriye,Sun Lei,Mujwar Somdutt
Human body odor is a result of the bacterial biotransformation of odorless precursor molecules secreted by the underarm sweat glands. In the human axilla, Staphylococcus hominis is the predominant bacterial species responsible for the biotransformation process of the odorless precursor molecule into the malodorous 3M3SH by two enzymes, a dipeptidase and a specific C-S lyase. The current solutions for malodor, such as deodorants and antiperspirants are known to block the apocrine glands or disrupt the skin microbiota. Additionally, these chemicals endanger both the environment and human health, and their long-term use can influence the function of sweat glands. Therefore, there is a need for the development of alternative, environmentally friendly, and natural solutions for the prevention of human body malodor. In this study, a library of secondary metabolites from various plants was screened to inhibit the C-S lyase, which metabolizes the odorless precursor sweat molecules, through molecular docking and molecular dynamics (MD) simulation. In silico studies revealed that tannic acid had the strongest affinity towards C-S lyase and was stably maintained in the binding pocket of the enzyme during 100-ns MD simulation. We found in the in vitro biotransformation assays that 1 mM tannic acid not only exhibited a significant reduction in malodor formation but also had quite low growth inhibition in S. hominis, indicating the minimum inhibitory effect of tannic acid on the skin microflora. This study paved the way for the development of a promising natural C-S lyase inhibitor to eliminate human body odor and can be used as a natural deodorizing molecule after further in vivo analysis.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Li Guo,Siwei Chen,Yue Jiang,Qihan Ding,Yunfei Yang,Jiali Zhi,Youheng Jia,Xiaoli Li
N and S co-doped porous carbon was prepared by decorating the waste disposable medical masks (WDMM) with thioacetamide (TAA) as the N/S source and then carbonizing at high temperature, which was subsequently incorporated Co-doped LaFeO 3 to obtain NSC@LaFe x Co 1-x O 3 catalysts. The resulting catalysts were used to construct an advanced oxidation process (AOP) based on activation of peroxymonosulfate (PMS) to degrade tetracycline (TC) in water. The physicochemical properties of the as-obtained catalysts were characterized and environmental factors affecting the catalytic performances of NSC@LaFe x Co 1-x O 3 /PMS were systematically investigated. The results showed that N and S co-doped porous carbon derived from thioacetamide (TAA)-functionalized WDMM at high temperature could be used as good support for LaFe x Co 1-x O 3 . The synergistic effects between N/S co-doped carbon and polyvalent metals (Co 2+ /Co 3+ and Fe 3+ /Fe 2+ ) endowed NSC@LaFe x Co 1-x O 3 with enhanced catalytic performances, in which nearly 100% of TC could be removed by NSC@LaFe 0.95 Co 0.05 O 3 /PMS system within 10 min under the conditions of 0.2 g/L of catalyst dose, 2.5 mmol/L of PMS concentration and 10 mg/L of initial TC concentration. Furthermore, the constructed NSC@LaFe 0.95 Co 0.05 O 3 /PMS system exhibited a wider pH adaptability (3.0 ∼ 10.0), good salt resistance and reusability as well as high mineralization. The mechanisms and possible pathways of TC degradation by NSC@LaFe 0.95 Co 0.05 O 3 /PMS system were proposed and the ecotoxicity of TC and its intermediates was also evaluated. This study demonstrated the feasible transformation of waste masks into porous carbon with high added value for water pollution control and remediation, accomplishing the dual purposes of recycling and resource utilization of waste masks and protecting the environment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Xiaobo Wang,Zhengqiu He,Kaixuan Huo,Jialiang Liu,Qingshan Zhao,Mingbo Wu
Constructing high-performance and low-cost carbon anodes for potassium-ion batteries (PIBs) is highly desirable but faces great challenges. In this study, we present a novel approach to fabricating N/S co-doped hollow amorphous carbon (LNSHAC) for superior potassium storage through a template-assisted molecular structure regulation strategy. By tailoring a 3D crosslinked aromatics precursor from fluid catalytic cracking slurry (FCCs), the LNSHAC features a N/S co-doped hollow structure with enlarged interlayer spacing of up to 0.405 nm and rich defects. Such unique microstructure offers fast transport channels for K-ion intercalation/deintercalation and provides more active sites, leading to boosted reaction kinetics and potassium storage capacity. Consequently, the LNSHAC electrode delivers an impressive reversible capacity (466.2 mAh g −1 at 0.1 A/g), excellent rate capability (336.3 mAh g −1 at 2 A/g), and superior cyclic performance (256.9 mAh g −1 after 5000 cycles at 5 A/g with admirable retention of 76.9 %), standing out among the reported carbon-based anodes. When KFeHCF is employed as the cathode, the LNSHAC-based K-ion full cell exhibits a high reversible capacity of 176.6 mAh g −1 at 0.1 A/g and excellent cyclic stability over 200 cycles. This work will inspire the development and application of advanced carbon-based materials for potassium electrochemical energy storage.
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Molecular Catalysis
·
2024
·
IF 3.9
Xuecai Wei,Xiaoyang Yue,Quan Yuan,Ying He,Li Ma,Liya Zhou,Guanhua Liu,Yunting Liu,Yanjun Jiang
Ethyl ( S )-4‑chloro-3-hydroxybutyrate [( S )-CHBE] is attractive as a necessary intermediate for the production of highly valued products in pharmaceutical industries. Nowadays, alcohol dehydrogenases play an increasingly essential role in the asymmetric synthesis of chiral alcohols. In this work, a nicotinamide adenine dinucleotide (NADH)-dependent alcohol dehydrogenase from Pseudomonas bacterium ( Pb ADH) was obtained by genome mining method and identified to exhibit an excellent tolerance against the high substrate and product concentrations. For the regeneration of NADH, Bacillus megaterium glucose dehydrogenase ( Bm GDH) was successfully co-expressed with Pb ADH in E. coli cells. So much as 3.5 M (574 g/L) ethyl 4-chloroacetoacetate (COBE) can be converted to ( S )-CHBE completely with a > 99 % ee value under the catalysis by recombinant cells, even in a monophasic aqueous media with a single batch charge of substrate. In addition, in order to verify the substrate scope of Pb ADH, six other α/β-ketone esters and aromatic ketones were also evaluated as substrates at high substrate concentrations (100–650 g/L), and the corresponding chiral alcohols with highly optical purity were also achieved by co-expressed E. coli cells.
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JOURNAL OF MOLECULAR STRUCTURE
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2024
·
IF 4
Liruhua Zhang,Zhixiang Chen,Yuxiang Wu,Tao Yang,Ling Bing Kong,Qingxia Liu
The advancement of efficient photocatalysts is crucial for the conversion of carbon dioxide (CO 2 ) into chemical fuels and wastewater treatment, due to the significant role in promoting energy sustainability and environmental remediation. In this work, we synthesized iron (II) phthalocyanine modified oxygen vacancy-rich (FePc/OVs-rich WO 3 ) photocatalyst with an S-scheme structure through electrospinning-calcination and electrostatic self-assembly. The optimized FePc/WO 3 –2 nanocomposite demonstrated approximately 3.69-fold enhancement in photoactivity for the conversion of CO 2 to CO and CH 4 , as compared with the OVs-rich WO 3 nanofibers. Furthermore, the FePc/WO 3 –2 catalyst demonstrated outstanding efficacy in activating peroxymonosulfate (PMS) for the degradation of tetracycline hydrochloride (TC), achieving an efficiency of 84.9 % within 60 min and a rate constant of 0.924 h −1 . The improved photocatalytic performance is attributed to the prolonged absorption of visible light, enhanced charge separation and the increased density of catalytic reaction sites. The enhancement in charge separation is predominantly linked to the unique S-scheme transfer process, which is characterized by non-overlapping optical absorption, in-situ X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT). This process is further facilitated by the catalytic activity of central Fe 2+ in FePc for the degradation of TC. The π-π interaction between FePc and the WO 3 nanofibers, which have a high concentration of oxygen vacancies, resulted in a fast electron transfer pathway, allowing efficient transport of photoelectrons. This paper comprehensively examines the advancement of high-performance S-scheme FePc/OVs-rich WO 3 photocatalysts for the photocatalytic reduction of CO 2 and degradation of tetracycline through the photo-assisted activation of PMS.
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Small
·
2024
·
IF 13
Huan Xu,Xiao Sun,Lingtong Ding,Jingjing Liu,Dan Zhang,Minmin Liu,Xiao Wang,Qixian Zhang,Jiujun Zhang
Electrochemical water-electrolysis for hydrogen generation often requires more energy due to the sluggish oxygen evolution reaction (OER). This work introduces a double-layered nanoflower catalyst, NiFe-LDH@S-NiFeO x /NF, featuring a crystalline NiFe-LDH coating on amorphous S-NiFeO x on nickel foam. Strategically integrating a crystalline-amorphous (c-a) heterostructure leverages strain engineering to enhance OER activity with low overpotentials ( η 100 = 220 and η 500 = 245 mV) and stability (135 h at η 100 and 80 h at η 500 ). Theoretical density functional theory (DFT) calculations reveal that the compressive strain can optimize the adsorption of oxygen-containing intermediates to reduce the reaction energy barrier, thus improving the reaction kinetics and performance of OER. Moreover, its phosphated derivative, NiFeP@S-NiFeO x /NF, exhibits high hydrogen evolution reaction (HER) performance ( η 10 = 64 mV, η 100 = 187 mV). An alkaline water-electrolysis cell of NiFeP@S-NiFeO x /NF(−)||NiFe-LDH@S-NiFeO x /NF(+) requires only a cell voltage of 1.77 V at 100 mA cm −2 , demonstrating excellent stability over 110 h (at both 10 and 100 mA cm −2 ). This work highlights the benefits of integrating crystal-amorphous interfaces and strain effects, offering insights into the understanding and optimizing catalytic OER mechanism and advancing water-electrolysis technology.
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