INORGANIC CHEMISTRY
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2022
·
IF 5.436
Danyang Dou,Bingjie Cai,Bingbing Zhang,Ying Wang
Nonlinear optical (NLO) crystals are very important for laser technology, but the performances of available NLO crystals are still insufficient for increasing demand. Recently, the exploration of new NLO crystals in non-π-conjugated systems with the heteroatomic tetrahedra is attracting a lot of interest. In this work, we systematically explore the metal sulfamates containing [NH2SO3] groups and four metal sulfamates, namely, Ca(NH2SO3)2·4H2O, Ca(NH2SO3)2·H2O, Pb(NH2SO3)2·H2O, and Pb(NH2SO3)2 were synthesized by aqueous solution and hydrothermal methods. Notably, these metal sulfamates exhibit different crystal structures and optical properties owing to the diverse arrangement of the functional groups in their structures. In addition, due to hydrogen bond regulation, the centrosymmetric (CS) compound Ca(NH2SO3)2·4H2O can transform into noncentrosymmetric (NCS) Ca(NH2SO3)2·H2O, leading to NLO activity. Experimental characterizations and theoretical analysis reveal that these metal sulfamates are ultraviolet transparent and suitable for developing new NLO materials.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Xinming Feng,Yujin Cao,Wei Liu,Mo Xian
Fluoride plays an important role in the fields of materials and medicine. Compared with chemical synthesis, fluorinases are natural catalysts with more application potential, which provide a green and effective way to obtain organofluorine. However, the application of fluorinases is limited by certain factors, such as the limited number of enzymes and their low activity. In this work, two new fluorinases from Amycolatopsis sp. CA-128772 and Methanosaeta sp. PtaU1.Bin055 were identified by gene mining and named Fam and Fme, respectively. The activities of these two enzymes were reported for the first time, and Fme showed good thermal stability, which was different from the reported fluorinases. In addition, the activity toward natural substrate of Fam was improved by site-directed mutagenesis, the catalytic efficiency ( k cat /K m ) of the best mutant containing two amino acid substitutions (T72A and S164G) toward the substrate S-adenosyl-L-methionine was improved by 2.2-fold compared to the wild-type. Structural modeling analysis revealed that the main reason for the increased enzyme activity might be the formation of a new substrate channel. Experimental evidence suggests that the substrate channel may indeed play a key role in regulating the function of the fluorinases.
研究领域:
生物化学
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酶学
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生物催化
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合成生物学
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DOI
PubMed
高影响因子
ACS Catalysis
·
2026
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IF 13.6
Xue Ye,Yongzhi Wang,Peipei Zhang,Xiaojun Li,Yifei Li,Wenlin Xu,Jie Li
To address the challenging trade-off between activity and selectivity in low-temperature hydrogenation of CO2 to methanol, this study employs a nanoreactor design strategy to construct a Ca-doped Cu-based core–shell catalyst (CZ@Cu5Ca2Zn0.375). Under a low temperature of 200 °C, 5.0 MPa, and gas hourly space velocity (GHSV) = 9000 mL·gcat–1·h–1, this catalyst achieves a CO2 conversion rate of 8.8%, methanol selectivity of 92.0%, and a space–time yield (STY) of 252.8 g·kg–1·h–1. Ca doping introduces moderate basic sites and enhances the adsorption of CO2 by utilizing the alkaline nature of Ca, thereby improving the surface utilization efficiency. Simultaneously, the core–shell structure preserves the integrity of the hollow sphere and provides a spatial confinement effect that increases local methanol concentration, facilitating its autocatalytic role in methanol synthesis. The synergistic integration of the Ca-based outer shell and the hollow core promotes CO2 adsorption, strengthens the autocatalytic pathway, and suppresses side reactions. This cooperative design effectively breaks the traditional activity–selectivity trade-off and offers a strategy for low-temperature, efficient CO2-to-methanol conversion.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 18
·1-16
·
IF 2.8
Yang Zaizhi,Shen Yalong,Zhu Yuan,Jiang Xiaoming,Liu Rui,Yang Zhen,Wang Shouliang,Xu Dong
Flash sintering has revolutionized the field of advanced ceramic preparation with the low heating temperature and extremely short sintering time. The difference of doped ions radius can influence the defect structure and resistivity of the sample through lattice distortion, subsequently altering the parameters and dielectric properties of flash sintering samples. By flash sintering technology, co-doped TiO 2 ceramics with the acceptor ions (Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ ) and donor ions (Nb 5+ ) were successfully prepared at 1100 °C for 24 min. According to the blackbody radiation model, Mg 2+ and Nb 5+ co-doped TiO 2 ceramics exhibit the highest surface temperature at the moment of flash sintering, approximately 1852 °C. Additionally, the co-doped TiO 2 ceramics with Ba 2+ and Nb 5+ ions exhibit the strongest polarization effect, with a dielectric constant above 10 5 . The acceptor ions with larger ions increase oxygen vacancies by enhancing the stability of defect complexes. The excellent giant dielectric properties are attributed to the combined action of the electron-pinned defect dipole effect and the internal barrier layer capacitor effect.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
·
IF 4.6
Zhuoying Li,Linan Zhou,Fang Zhang,Huiyi Yang,Lihua Guo,Fang Chai
Heavy metals adversely affect the environment, ecosystems, and human health. The effective detection and treatment of heavy metals has become a major global concern. Herein, calcium and nitrogen co-doped carbon dots (E-CDs) were developed using cheap kitchen waste eggshells as precursors, and utilized as dual-mode fluorimetric/colorimetric sensor for the multivariate detection of Hg 2+ and Ag + . The E-CDs exhibited yellow emission at 420 nm excited at 567 nm, with a quantum yield of 15.49% and lifetime of 12.92 μs. The multivariate detection of Hg 2+ and Ag + can be achieved selectively by distinguishing via dual-mode respectively. The limit of detection (LOD) for Hg 2+ reached 11.28 nM, while the Ag + can be determined by fluorimetric/colorimetric dual-mode with LODs of 128.23 nM and 1.02 μM, respectively. Remarkably, the E-CDs integrated with a smartphone-based paper sensor supported by RGB analysis achieved the detection of Hg 2+ and Ag + with LODs of 56.2 nM and 90.96 nM, respectively. Notably, the recoveries in real samples attained 96.3–105.7% with excellent environmental tolerance. Furthermore, a logic gate circuit was developed to support the potential practical intelligent application. This work highlighted a cost-effective, multi-functional sensing strategy with significant potential for monitoring heavy metal contaminants in environmental and food safety applications.
✓ 已验证
DOI
PubMed
高影响因子
AIP Advances
·
2022
·Vol. 12
·期 5
·
IF 1.697
Tu Huan,Zhao Guoying,Hou Jingshan,Liu Yufeng,Zhou Yan,Zhang Ganghua,Sun Hong-Tao,Li Ji-Guang,Fang Yongzheng
White light emitting diodes (LEDs) suffer from two most common drawbacks: the deficiency of the red component and the poor thermal stability of silicone. Ce 3+ -doped garnet phosphors with tailor-made luminescence properties can be achieved by variations in {A}, {B}, and {C} cation sites. Herein, a simultaneous ion co-substitution design strategy has been adopted to synthesize a series of (Y, Ca) 3 (Al, Mg) 2 (Al, Si) 3 O 12 garnet phosphors and corresponding phosphor-in-glass (PiG) films. The co-substitution is finely restricted to the assigned sites. The emission peak is shifted from 529 to 565 nm, which is beneficial to obtain low color temperatures and high color rendering using a single phosphor for white LEDs. By employing the as-synthesized phosphor, the corresponding PiG films were fabricated by the low temperature co-sintering technology using the SiO 2 –B 2 O 3 –ZnO–Na 2 O glass system characterized with excellent thermal stability and moisture resistance. The morphological and elemental analyses demonstrated that the as-made phosphor powders were uniformly distributed in the glass host without any interfacial reactions. Finally, modular white LEDs with a high color rendering (Ra = 82.7) is achieved through the as-synthesized PiG film on an InGaN blue chip. This study may open up a facile approach to obtain high quality luminescence based on the mono-luminescence center, avoiding excitation energy wastage and low quantum efficiency aroused by multi-luminescence centers or color compensation phosphors in glass.
研究领域:
材料科学
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光电子学
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固态照明
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无机化学
·
应用物理学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Yinghui Sun,Guojie Zhang,Ying Xu,Riguang Zhang
The catalytic activity of DRM reaction over 1M-1Co-1Ce/AC-N (M = Ca and Mg) catalysts was investigated at 800 °C and under atmospheric pressure. By promoting N-doped activated carbon supported Co-Ce catalysts with alkaline-earth metals to obtain catalysts with better catalytic performance is the main purpose of study. The catalysts were prepared by wet-impregnation method and the influence of impregnation sequence on catalytic performance was also studied. The characterization was conducted using TPR, TPD , XPS, TEM and Raman. The catalyst 1Ca-1Co-1Ce/AC-N promoted with Ca and prepared by co-impregnation exhibited higher catalytic activity than unmodified. This was mainly due to the stronger interaction between metal and support as well as better active metals dispersion. The 1Ca-1Co-1Ce/AC-N catalysts also displayed excellent stability and XPS results indicated that higher Ce 3+ /Ce 4+ and O β /(O α +O β ) ratios were observed on this catalyst. However, the catalyst 1Co-1Ce/1Ca/AC-N prepared with sequential impregnation exhibited poor stability. In addition, the TEM of the spent catalysts revealed that there were a large number of carbons were generated on active metal surface.
研究领域:
催化化学
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能源化学
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材料化学
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环境化学
·
化学工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Zheng Zhang,Xiao Du,Qiang Wang,Fengfeng Gao,Tongtong Jin,Xiaogang Hao,Pengfei Ma,Jun Li,Guoqing Guan
A scalable three-dimensional (3D) porous composite electroactive film consisting of λ-MnO 2 , reduced graphene oxide (rGO) and calcium alginate (Ca-alg) was successfully fabricated and employed for the selective extraction of Li + ions with low concentration via an electrochemically switched ion exchange (ESIX) technology. The Li + ion adsorption capacity of the obtained λ-MnO 2 /rGO/Ca-alg composite electroactive film reached as high as 32.7 mg g −1 and more than 90% of its equilibrium adsorption capacity was achieved in 1 h. The λ-MnO 2 /rGO/Ca-alg composite electroactive film displayed evident selectivity towards Li + ions. The separation factors for Li + /Na + and Li + /Mg 2+ reached 1040.57 and 358.96, respectively, while tested in simulated brine. The composite film also showed superior electrochemical stability, and the normalized ion exchange capacity retained at 98.3% of its initial value even after 100 successive cycles. The excellent Li + ion recovery performance of the obtained composite film should be attributed to its low ion transfer resistance owing to the porous network structure and the potential-responsive ion-pumping effect in the ESIX process. In addition, a large-scale of such a composite electroactive film could be effectively fabricated by controlling the spreading area of the mixed solution consisting of λ-MnO 2 , rGO and alginate binder. It is expected that such a scalable 3D porous composite film could be a promising alternative for the recovery of lithium ions from salt lake brine.
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POLYMER DEGRADATION AND STABILITY
·
2017
·
IF 3.386
Mei Wang,Xianghai Song,Jianchun Jiang,Jianling Xia,Mei Li
N-(2-amino ethyl) tung maleamic acid (AETMA) and N-(2-amino phenyl) tung maleamic acid (APTMA) were prepared from the ammonolysis of ethidene diamine (ED) and p-phenylenediamine (PPD) respectively with tung-maleic anhydride (TMA). Then LAETMA-Ca, LAPTMA-Ca, LABTMA-Zn and LAPTMA-Zn were separately synthesized through a one-step method and characterized by Fourier transform infrared spectrometry (FTIR), 1 H nuclear magnetic resonance (NMR) and inductively coupled plasma atomic emission spectroscopy (ICP-AES). LAETMA-Ca/LAETMA-Zn and LAPTMA-Ca/LAPTMA-Zn were both used as thermal stabilizers of polyvinyl chloride (PVC) and investigated using Congo red test, thermal aging test, ultraviolet-visible spectrometry, thermogravimetric analysis (TGA), TGA-FTIR, and TGA–mass spectrometry (MS). Their stabilizing efficiencies were compared with other common stabilizers. Dynamic mechanical of the PVC compounds were also studied. The LAPTMA-Ca/LAPTMA-Zn exhibits excellent long-term stability and better plasticization performance for PVC than other stabilizers, and thus can partly replace di(2-ethylhexyl) terephthalate in the processing of PVC. The mechanism underlying the stabilizing action of LAPTMA-Ca/LAPTMA-Zn is suggested.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jianwei Dao,Zihao Han,Zhihao Jiang,Tiqun Wei,Junlin Xue,Bin Wang,Sicheng Yi,Liang Yang
Narrow-band red phosphors excited by near-ultraviolet light (n-UV) are significant for enhancing the R9 index and can produce high color rendering white LEDs. A range of KSr 1-x-y Ca y PO 4 :xEu 3+ red phosphors were synthesized by high-temperature solid-state reaction method. We investigated the effects of partially substituting Sr 2+ ions with Ca 2+ ions on the phosphors' crystal structure, photoluminescence and thermal stability. Significantly, incorporating Ca 2+ ions enhances the luminescent properties and thermal stability. Under n-UV light excitation, all samples exhibit red emission around 614 nm, corresponding to the 5 D 0 → 7 F 2 transition of Eu 3+ ions. At the doping concentration of Eu 3+ ions (x = 0.08), an optimal KSr 0.52 Ca 0.4 PO 4 :0.08Eu 3+ (y = 0.4) sample was obtained. The excitation wavelength exhibited a slight violet shift from 398 nm to 396 nm. At 150 °C, the luminescence intensity of KSr 0.92 PO 4 :0.08Eu 3+ remains 80.1 % of its value at room temperature, while that of KSr 0.52 Ca 0.4 PO 4 :0.08Eu 3+ reaches 89.7 %. White LED device can be fabricated by combining the as-prepared KSr 0.52 Ca 0.4 PO 4 :0.08Eu 3+ red phosphor with commercial BaMgAl 10 O 17 :Eu 2+ blue and (Ba, Sr) 2 SiO 4 :Eu 2+ green phosphors, along with encapsulation using n-UV LED chip (395–400 nm). The device emits bright white light and exhibits a high color rendering index (Ra = 87.6, R9 = 89.8) and suitable correlated color temperature (CCT = 5523 K) at 300 mA drive current. The results demonstrate that this work provides new application prospects for the fabrication of high color rendering white LEDs using n-UV light.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiao Wang,Bingcheng Lin,Jian Wang,Yunfeng Ma,Rong Jin,Guorui Liu,Minghui Zheng
Four inhibitors (CaO, CaS, CH 4 N 2 S, and (NH 4 ) 2 SO 4 ) were employed to inhibit the formation of multiple unintentional persistent organic pollutants (POPs) and environmentally persistent free radicals (EPFRs) using anthracene as a precursor, with CuCl 2 serving as both a transition metal catalyst and chlorine source. The inhibition mechanisms were elucidated in terms of chlorine immobilization, catalyst deactivation, and free radical regulation. The inhibition efficiency of the four inhibitors on polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), polychlorinated biphenyls (PCBs), and polychlorinated naphthalenes (PCNs) ranged from 64.7 % to 98.4 %, with the corresponding inhibition rates on toxic equivalency quantity ranging from 86.3 % to 99.7 %. The distribution of homologs shifted towards less chlorinated species, indicating effective suppression of chlorination. Calcium- and nitrogen-containing compounds consumed chlorine sources by forming CaCl 2 , CaClOH, and NH 4 Cl, while sulfur-containing compounds deactivated catalysts by forming CuSO 4 . EPFRs derived from anthracene were identified as carbon-centered anthracene-type and anthraquinone-type radicals. Positive correlations were observed between POPs and EPFRs concentrations, suggesting the pivotal role of organic free radicals as intermediates in POPs formation. Anthraquinones derived from anthracene underwent decomposition, recombination and chlorination, leading to the formation of PCDD/Fs and PCBs. The addition of inhibitors reduced EPFRs concentrations by 74.2–95.1 %. Sulfur- and nitrogen-containing inhibitors generated radicals that attacked POPs precursors and intermediates, forming heteroatomic compounds and inhibiting POPs formation. These findings enhanced the understanding of the source control mechanisms of POPs and provided theoretical and technical support for the synergistic inhibition of POPs and EPFRs in industrial thermal processes.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xiaolan Chen,Tian Wang,Wanzheng Lu,Tianxiang Cao,Mingzhe Xue,Bing Li,Cunman Zhang
A modified solution method was applied to synthesize cubic garnet solid-state electrolyte Li 7 La 3 Zr 2 O 12 (LLZO) and Li 6.45 Ca 0.05 La 2.95 Ta 0.6 Zr 1.4 O 12 (LCLTZO). The synergetic doping of Ca and Ta is found to induce the formation of cubic LCLZTO with high ionic conductivity of 4.03 × 10 −4 S cm −1 while LLZO without substitution exhibits tetragonal phase with low conductivity. A Li-S cell with sulfur cathode and as-prepared LCLTZO solid electrolyte “separator” was conducted to deliver large initial discharge capacity of 1090 mAh g −1 with high initial Coulombic efficiency up to 92%. Cell with LCLTZO also exhibited better cycling performance at 0.2 C and extremely high Coulombic efficiency (close to 100%) than the cell without solid electrolyte. Better rate performance was also achieved at lower rate (0.2 C, 0.5 C and 1 C) by cell with LCLTZO although it lost advantages at higher rate of 2 C and 5 C due to the limitation of ionic conductivity of LCLTZO. Energy dispersive X-ray spectroscopy (EDS) provided direct evidence that LCLTZO solid electrolyte greatly suppressed the shuttle effect generated by polysulfides . The electrochemical impedance spectroscopy was applied to discuss the difference between cells with and without LCLTZO during the discharge process. Charge transfer reaction referred to soluble polysulfides was found to be slower in cell with LCLTZO than that in cell without solid electrolyte.
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