Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Wenhao Zhang,Meiyan Cui,Zhiying Zhao,Tianyu Zhu,Zhangzhen He
Based on the crystal structure of A2Cu5(TeO3)(SO4)3(OH)4 (A = Na, K), two new compounds ACo5(SeO3)4(OH)2F (A = Rb, Cs) have been synthesized by introducing F− ions, achieving the extension from a one-dimensional kagomé strip lattice to a distorted 2-uniform lattice (T29). Magnetic measurements indicate that RbCo5 exhibits antiferromagnetic order at low temperatures, while CsCo5 shows canted antiferromagnetic behavior. Both compounds display a field-induced magnetic transition at their respective critical fields. To the best of our knowledge, this is the first reported synthesis of compounds with a distorted 2-uniform lattice (T29).
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Desalination and Water Treatment
·
2025
·
IF 1
Jingyi Chen,Chunyu Ji,Junsheng Liu,Jie Zhang
A series of new PMDA@CS/PVA composite membranes were fabricated by the crosslinking of pyromellitic dianhydride (PMDA) with chitosan (CS) and poly(vinyl alcohol) (PVA) in the presence of glutaraldehyde (GA) as a crosslinking agent. While, their adsorptions for Cu(II), Co(II), and Ni(II) in a single- and multiple mixed solutions were investigated. It was found that the incorporation of PMDA in the membranes can significantly enhance the adsorption capacity of membranes for these metals. The fitting of kinetic modeling s showed that the sorption manner of Cu(II), Co(II) and Ni(II) on the membranes obeyed the quasi-2nd kinetic modeling, indicating that it was dominated by chemisorption. The kinetic rate constants K 2 of membranes A-E for Cu(II), Co(II), and Ni(II) were in the region of 0.005–0.02, 0.026–0.082, and 0.002–0.053 [g/(h·mg)], respectively. The fitting of sorption isotherm modeling followed the Langmuir isotherm equation and the maximal Langmuir adsorption capacities for Cu(II), Co(II), and Ni(II) could reach 36.466, 32.119, and 30.916 mg/g, respectively. In addition, in the multi-component solutions, these membranes exhibited better selection for Cu(II) in Cu(II), Co(II), and Ni(II) mixed solutions. Moreover, it can be recycled five times when an EDTA was used as a de-sorbent. The exploration based on statistical physics principle confirmed that the adsorption of these membranes for Cu(II) is a mono-ion manner. These findings suggest that PMDA@CS/PVA composite membranes are promising sorbents for the removal of toxic metal ions from waste vehicle power batteries or metal-bearing wastewater.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Ran Ran,Hanwen Yan,Guoliang Zhang,Zengxi Li,Gang Wang,Gongying Wang,Weiguang Su,Chunshan Li
Supported Cs-based catalysts are considered as potential candidates for methyl methacrylate (MMA) synthesis via one-step aldol condensation, but they suffer from low activity. In this paper, the acid–base properties of the Cs/SiO2 catalyst were modulated by loading different amounts of the Al element. The changes in structural and physicochemical properties following Al introduction were revealed by a series of characterizations. In-depth investigation of the catalytic mechanism through in situ DRIFT combined with DFT calculations unveiled the synergistic effects between the Al and Cs components on the promotion of catalytic performance. The results showed that the presence of Al species facilitated the formation of weak and medium acid and base sites, along with the dispersion of the active Cs component, leading to an improvement of MMA yield. Additionally, the kinetic studies indicated that the addition of Al efficiently reduced the activation energy in comparison to pristine Cs/SiO2.
研究领域:
化学工程
·
催化科学
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Junxin Zhao,Maomao Ma,Xianghui Yan,Guohua Zhang,Jiaheng Xia,Guibing Zeng,Wenran Tian,Xianliang Bao,Zheling Zeng,Ping Yu,Deming Gong
A novel lipase from Bacillus licheniformis NCU CS-5 was expressed in different Escherichia coli cells. The recombinant enzyme achieved a high activity (161.74 U/mL) with protein concentration of 0.27 mg/mL under optimal conditions at the large-scale expression of 12 h. The recombinant lipase showed optimal activity at 40 ℃ and pH 10.0, and maintained more than 80% relative activity after 96 h of incubation at pH 9.0–10.0. This typical alkaline lipase was activated under medium temperature conditions (30 and 45 ℃ for 96 h). The lipase exhibited a degree of adaptability in various organic solvents and metal ions, and showed high specificity towards triglycerides with short and medium chain fatty acids. Among different substrates, the lipase showed the strongest binding affinity towards p NPP ( K m = 0.674 mM, V max = 950.196 μM/min). In the experiments of its application in enhancing fatty acids flavor release for low-fat cheeses, the lipase was found to hydrolyze cheeses and mainly increase the contents of butyric acid, hexanoic acid, caprylic acid and decanoic acid. The results from NMR and GC provided the possibility of enhancing fatty acids flavor released from low-fat cheeses by the lipolysis method.
研究领域:
生物化学
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食品科学
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酶学
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微生物学
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 2
·1018-1026
·
IF 3.094
Xuefang Luo,Ziyang Hou,Tianliang Zhou,Rong-Jun Xie
Mn 4+ -activated fluoride red-emitting narrow-band phosphors have been successfully used in wide color-gamut white LEDs for liquid crystal display (LCD) backlights. However, highly concentrated and toxic HF is usually used in their synthesis, causing environment and safety issues. In this work, we proposed a HF-free green method, that is, using NH 4 F/HCl instead of HF, to synthesize a series of A 2 X F 6 :Mn 4+ ( A = K, Na, Rb, Cs; X = Si, Ge, Ti) phosphors. The microstructure, photoluminescence (PL) properties, thermal quenching, and applications of the synthesized phosphors were investigated. Using the proposed approach, the phosphors generally showed a pure phase, a particle size ranging from 5 to 45 μm, and some characteristic sharp emission lines of Mn 4+ in the red spectral range. The internal quantum efficiency was varied in a broad range of 69%-94% under the 460 nm excitation, depending on the composition of the fluoride host. Among these compositions, K 2 X F 6 :Mn 4+ ( X = Ge and Ti) phosphors even had a similar external quantum efficiency (>60%) with commercial ones. By combining K 2 GeF 6 :Mn 4+ (narrow-band red) and β -sialon:Eu 2+ (narrow-band green) with a blue LED, a white light-emitting diode (wLED) backlight with a color gamut of 87.7% National Television System Committee Standard, color temperature of 8423 K, and a luminous efficacy of 110.8 lm/W was demonstrated. These results indicate that the synthetic method proposed in this work is universal for preparing highly efficient fluoride phosphors used in wLEDs.
研究领域:
材料科学
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光电技术
·
光子学
·
照明技术
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2020
·Vol. 646
·期 20
·1688-1695
·
IF 1.24
Shuangsheng Cheng,YuanDong Wu,Dajiang Mei,Shaoguo Wen,Thomas Doert
Four alkali metal bismuth sulfates, NaBi(SO 4 ) 2 · H 2 O ( 1 ) and ABi(SO 4 ) 2 [A = K ( 2 ), Rb ( 3 ), Cs ( 4 )], were successfully synthesized by hydrothermal methods. The crystal structure of 1 features a three-dimensional tunnel framework constructed by BiO 9 tri-capped trigonal prisms and SO 4 tetrahedra interconnected via common corners and edges. Compound 2 exhibits a two-dimensional 2 ∞ [Bi(SO 4 ) 2 ] – double-layered structure, assembled by one-dimensional 1 ∞ [BiS(1)O 4 ] + chains which are linked via S(2)O 4 2– tetrahedra. The isostructural compounds 3 and 4 possess a two-dimensional layered structure, and the layers being composed by BiO 8 square antiprism and SO 4 tetrahedra. The alkali metal cations are located between the layers or in the tunnels of the structures, respectively. The differences in the crystal structures of the title compounds can mainly be attributed to the different sizes of the alkali metal cations and their different coordination environments. Thermogravimetric analysis evidence that compound 1 losses one equivalent of water at 120 °C whereas the anhydrous compounds 2 – 4 are stable up to about 450, 575, and 578 °C, respectively. The solid-state UV/Vis/NIR diffuse reflectance spectra indicate bandgaps of approximately 4.48, 4.43, 3.98, and 3.96 eV for compounds 1 – 4 , respectively.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Mei Zhang,Yizhong Yuan,Jie Jin,Jinyu Sun,Xiaohui Tian
Using natural rubber (NR)/chitosan (CS)/polyvinyl alcohol (PVA) as raw materials, biodegradable semi-IPN (semi-interpenetrating polymer network) composites were prepared by thiol-epoxy click reaction under UV light, which was used as the shell of sustained release preparation. Using polyvinyl alcohol (PVA)/carboxymethyl chitosan (CMCS) as raw material and vanillin as the cross-linking agent, hydrogen-bonded hybrid network hydrogel loaded with urea was prepared by freeze-thaw cycle, which was used as the core of sustained-release preparation. Finally, a green-coated urea fertilizer with core-shell structure was prepared to ameliorate the environmental pollution of slow-release fertilizer (for example, synthetic polymer-coated fertilizers are difficult to biodegrade), as well as to achieve the water retention and the effective slow-release. The high CS/PVA contents and the combination of the hydrogel core and the rubber shell significantly improved the mechanical properties of the coating material (tensile strength above 5 MPa, elongation at break up to 1400 %), hydrophilicity (to promote the degradation rate of the rubber shell) and soil water retention of the coating material (close to pure hydrogel), showing enhanced reaction. In terms of slow-release effect, coated nitrogen fertilizer with 3 % CS content, 5 % PVA content and 10-min coating time (SRP3/10) achieved the best slow-release effect of nitrogen (N) in water (62.7 % at 10 days), which was related to the hydrophilicity, semi-IPN skeleton and the cross-linking structure of the network, and the release conformed to the Korsmeyer-Peppas model with a non-Fickian diffusion release mechanism, indicating that the behavior of N release was mediated by a combination of drug diffusion and skeleton dissolution.
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RSC Advances
·
2024
·Vol. 14
·期 11
·7517-7527
·
IF 3.9
Yihong Yang,Genlan Ye,Xiaozhong Qiu
Intraoperative bleeding is a pivotal factor in the initiation of early recurrence and tumor metastasis following breast cancer excision. Distinct advantages are conferred upon postoperative breast cancer treatment through the utilization of locally administered implant therapies. This study devised a novel 3D sponge implant containing cisplatin-loaded chitosan–calcium alginate MPs capable of exerting combined chemotherapy and hemostasis effects. This innovative local drug-delivery implant absorbed blood and residual tumor cells post-tumor resection. Furthermore, the cisplatin-loaded chitosan–calcium alginate MPs sustainably targeted and eliminated cancer cells, thereby diminishing the risk of local recurrence and distant metastasis. This hydrogel material can also contribute to breast reconstruction, indicating the potential application of the 3D sponge in drug delivery for breast cancer treatment.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 31
·e52720
·
IF 3.057
Xiaolong Wang,Weiguang Gong,Xin Meng,Chenyang Li,Jin Gao
Biobased flame retardant (FR) has attracted great interest owing to its green and degradable properties similar to polylactic acid (PLA). In this work, with ammonium polyphosphate (APP) as the core, chitosan (CS) and halloysite (HNT) as the shell, a biobased FR (APP@CS@HNT) with a core-shell structure was prepared through the self-assembly method. The flame retardancy of PLA composites has been improved with the addition of the FR (APP@CS@HNT). With the loading of 17 wt% APP@CS@HNT, the PLA composite shows a high limiting oxygen index value (29.4%) and achieves vertical burning (UL-94) test V0 rating. Compared with pure PLA, the cone calorimetry test indicates that the peak heat release rate (PHRR) and total heat release decrease from 299.88 to 152.29 kW/m 2 and from 102.0 to 71.2 MJ/m 2 , respectively. The addition of APP@CS@HNT can also improve the smoke suppression performance of PLA composites. Such enhanced flame retardancy is mainly attributed to APP@CS@HNT prompting the PLA matrix to produce more continuous and denser carbon layers at a lower temperature to form physical barriers.
研究领域:
材料科学
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高分子科学
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消防安全工程
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纳米技术
·
环境科学
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Sihang Ji,Lijia Zhao,Chen Chen,Jialong Zhao,Jin Wang,Jinju Zheng,Xi Yuan
The development of quasi-two-dimensional (quasi-2D) perovskite films with high photoluminescence quantum yield (PL QY) and robust environmental stability remains a critical challenge for advanced optoelectronic applications. Herein, we report an A/B-site synergistic doping strategy by incorporating multivalent Cs + (A-site) and Cd 2+ (B-site) ions into quasi-2D BA 2 MA n-1 Pb n Br 3n+1 films, significantly enhancing their optical quality and structural stability. Notably, the bimetallic ion-doped films achieve a high PL QY of up to 90 % at 490 nm, along with excellent homogeneous phase stability (the phase separation of quasi-2D films emitting at 435 nm and 490 nm is suppressed even after 1 h and 10 h). Moreover, co-doping with multivalent Cs + and Cd 2+ ions induces a significant reduction in both grain size (10–15 nm) and surface roughness (∼1 nm), while endowing the quasi-2D films with a high exciton binding energy (>300 meV). The variable temperature PL spectra reveal the band-edge radiative dynamics, which originate from the thermal competition between exciton and trap-mediated recombination. The heat-induced electron-phonon interaction enhances the proportion of trap-mediated recombination, leading to an increase in the average PL lifetime. The A/B-site synergistic engineering provides a novel approach for improving the PL performance and photostability of quasi-2D perovskite films, paving the way toward high-performance light-emitting diodes, lasers, and other ptoelectronic devices based on the luminescent layer.
研究领域:
材料科学
·
光电子学
·
钙钛矿光子学
·
纳米材料
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固态物理
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jiahao Wu,Huiping Zeng,Fanhao Meng,Yating Zhao,Dong Li,Jie Zhang
The widespread occurrence of antibiotic residues in aquatic environments has become a major water pollution concern, posing ecological risks and accelerating antimicrobial resistance. Metal–phenolic networks (MPNs), eco-friendly functional materials formed via coordination between natural polyphenols and metal ions, exhibit broad application potential in environmental remediation. In this study, a novel composite adsorbent (FTN@CS/PVA) was fabricated by uniformly immobilizing MPN structures within a three-dimensional porous chitosan/polyvinyl alcohol (CS/PVA) gel beads through the in situ coordination of Fe 3+ and tannic acid (TA). The resulting material exhibited excellent adsorption performance toward tetracycline hydrochloride (TCH), achieving a maximum adsorption capacity of 95.5 mg/g at 298 K and pH 3. The adsorption process followed the pseudo-second-order kinetic model (R 2 = 0.9963) and the Redlich–Peterson isotherm model (R 2 = 0.9736). The primary adsorption mechanisms involved synergistic physicochemical interactions, including hydrogen bonding, Fe O coordination, and electron transfer. Notably, FTN@CS/PVA also exhibited high adsorption efficiency toward various dyes and maintained excellent competitive and selective adsorption performance even in a TC–MB binary system. Furthermore, FTN@CS/PVA retained high TCH removal efficiency in real water matrices (lake water, domestic wastewater, and secondary effluent from a wastewater treatment plant) and in complex systems containing various coexisting anions or humic acid (HA), demonstrating superior interference resistance and environmental adaptability. In addition, FTN@CS/PVA demonstrated structural stability and excellent regenerability, maintaining over 80 % of its adsorption capacity after three adsorption–desorption cycles in the presence of humic acid (HA). This study provides a novel design strategy and theoretical foundation for developing highly stable and selective MPN-based composite adsorbents for the efficient removal of antibiotic contaminants.
研究领域:
环境科学
·
材料科学
·
水处理技术
·
吸附工程
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高影响因子
ACS Sensors
·
2025
·
IF 9.1
Kai Wang,Jia-Wei Li,Rui Guo,Rong Hu,Zhao-Cheng Liu,Hao-Xiang Jiang
Detecting glutathione S-transferases (GSTs) in cardiovascular diseases is crucial for understanding oxidative stress and its role in disease progression, but it remains challenging due to GST’s dynamic expression and interactions with other cellular components. In this study, the CS-GST optical probe was developed to monitor GST activity. The probe demonstrated unique optical properties, with fluorescence intensity increasing and photoacoustic signals decreasing upon interacting with GST. It showed excellent sensitivity and selectivity, with strong correlations between fluorescence and GST concentration. In cellular and in vivo experiments, CS-GST effectively tracked GST activity in foam cell models and mice, showing potential as a biomarker for cardiovascular diseases. Overall, CS-GST is a highly sensitive, selective, and stable tool with promising applications in cardiovascular disease research, offering a noninvasive method for real-time monitoring of GST activity.
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