COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Yujia Li,Erping Bi
The metal-substituted goethite with addition of oxidants can effectively promote the degradation of antibiotics, but the usage of external agents restricts its application in in-situ remediation of antibiotic pollution. In this study, the metal-substituted goethites were prepared through co-precipitation method to investigate the effects of using manganese (Mn) or zinc (Zn) substitution alone on tetracycline (TC) degradation, combining with microscopic characterization and electrochemical methods. The results showed that the degradation rate constants of the first stage on Mn or Zn-substituted goethite were 0.299 h -1 and 0.498 h -1 , respectively, which were about 2 and 4 times of the pristine goethite (0.117 h -1 ). In the pH range of 4.0–9.0, Mn or Zn substitution significantly promoted TC degradation. Free and non-free radical pathways existed in the process of TC degradation by Mn or Zn-substituted goethite. The active site change and enhanced electron transfer ability were the main reasons for promoting degradation. Mn or Zn substitution increased oxygen vacancy (OV) content and promoted the electron transfer between TC and goethite. In Zn-substituted goethite, the coupling of OV and electron transfer produced free radicals, and in Mn-substituted goethite, the redox reaction induced mainly by electron transfer produces free radicals. This study reveals a new mechanism of efficient degradation of TC by iron minerals without the need for external oxidants, and the materials studied can be used for in-situ remediation of antibiotic contaminated groundwater.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhanying Yu,Xiyu Wang,Xinlong He,Runjing Li,Aimin Zhang,Jihai Zhang
Zinc is an ideal energy storage material because of its low toxicity, nonflammability, and good biocompatibility. However, the commercial application is seriously hindered due to problems such as dendrite growth, hydrogen evolution, and interface passivation caused by “dead zinc” in the process of cyclic deposition. Herein, a nanoscale deposition dispersion model is designed in order to achieve directional deposition and uniform distribution of zinc ions for the growth of interfacial dendrites. Liquid metal GaIn was combined with Mxene for this nanostructure, which provides a rapid ion transfer channel to achieve lower overpotentials, a more uniform electric field distribution, and stronger corrosion resistance in a core–shell structure to achieve interface reaction suppression. The material was coated on the surface of the zinc metal as an artificial protective layer. It has a better cycle life at 1 mA·cm–2 compared with the bare Zn metal anode, achieving a long cycle time of 1100 h and an ultralow voltage lag (28.1 mV). It maintains the stability for 1000 cycles at 1 mA·cm–2 after assembling the complete battery. This provides a way to improve the performance of zinc-ion secondary batteries and paves the way for the next generation of energy storage devices.
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Nano Research
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2018
·Vol. 11
·期 3
·1379-1388
·
IF 7.994
Liu Xiao-Yuan,Zhang Guozhen,Chen Hao,Li Haowen,Jiang Jun,Long Yi-Tao,Ning Zhijun
The development of photocatalysts that can effectively harvest visible light is essential for advances in high-efficiency solar-driven hydrogen generation. Herein, we synthesized water soluble CuInS 2 (CIS) and Cu-In-Zn-S (CIZS) quantum dots (QDs) by using one-pot aqueous method. The CIZS QDs are well passivated by glutathione ligands and are highly stable in aqueous conditions. We subsequently applied these QDs as a light harvesting material for photocatalytic hydrogen generation. Unlike most small band gap materials that show extremely low efficiency, these new QDs display remarkable energy conversion efficiency in the visible and near-infrared regions. The external quantum efficiency at 650 nm is ∼1.5%, which, to the best of our knowledge, is the highest value achieved until now in the near-infrared region.
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TALANTA
·
2018
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IF 4.244
Haoping Wang,Tiantian Kang,Xiaoju Wang,Liheng Feng
A simple Schiff base comprised of tris(2-aminoethyl)amine and salicylaldehyde was designed and synthesized by one-step reaction. Although this compound has poor selectivity for metal ions in acetonitrile , it shows high selectivity and sensitivity detection for Zn(II) ions through adjusting the solvent polarity (the volume ratio of CH 3 CN/H 2 O). In other words, this work provides a facile way to realize a transformation from poor to excellent feature for fluorescent probes . The bonding mode of this probe with Zn(II) ions was verified by 1 H NMR and MS assays. The stoichiometric ratio of the probe with Zn(II) is 1:1 (mole), which matches with the Job-plot assay. The detection limitation of the probe for Zn(II) is up to 1 × 10 −8 mol/L. The electrochemical property of the probe combined with Zn(II) was investigated by cyclic voltammetry method, and the result agreed with the theoretical calculation by the Gaussian 09 software. The probe for Zn(II) could be applied in practical samples and biological systems. The main contribution of this work lies in providing a very simple method to realize the selectivity transformation for poor selective probes. The providing way is a simple, easy and low-cost method for obtaining high selectively fluorescence probes.
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Green Energy & Environment
·
2024
·
IF 10.7
Yi-lei Li,Xu-jia Liu,Yun-biao Wang,Ying Liu,Rui-hong Liu,Hui-ying Mu,Ying-juan Hao,Xiao-jing Wang,Fa-tang Li
Adjusting the interfacial transport efficiency of photogenerated electrons and the free energy of hydrogen adsorption through interface engineering is an effective means of improving the photocatalytic activity of semiconductor photocatalysts. Herein, hollow ZnS/NiS nanocages with ohmic contacts containing Zn vacancy (V Zn -ZnS/NiS) are synthesized using ZIF-8 as templates. An internal electric field is constructed by Fermi level flattening to form ohmic contacts, which increase donor density and accelerate electron transport at the V Zn- ZnS/NiS interface. The experimental and DFT results show that the tight interface and V Zn can rearrange electrons, resulting in a higher charge density at the interface, and optimizing the Gibbs free energy of hydrogen adsorption. The optimal hydrogen production activity of V Zn -ZnS/NiS is 10,636 μmol h −1 g −1 , which is 31.9 times that of V Zn -ZnS. This study provides an idea for constructing sulfide heterojunctions with ohmic contacts and defects to achieve efficient photocatalytic hydrogen production.
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Molecular Catalysis
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2024
·
IF 3.9
Tao Liu,Youcai Zhu,Yue Mu,Xindi Feng,Zhen Liu
CO 2 -based polyols have a unique terminal hydroxyl group structure that makes them suitable for the production of high-performance polyurethane foams. Zn-Co double metal cyanides (DMC) are an important class of catalysts for the copolymerization reaction of CO 2 with propylene oxide (PO). In the DMC-catalyzed CO 2 /PO copolymerization to produce CO 2 -based polyols, the crucial role of chain transfer agents (CTAs) is emphasized. In this work, a high-performance composite CTA (c-CTA) was successfully developed by investigating various dicarboxylic acids and polypropylene glycol (PPG-400) as CTAs. This system combines the high reaction rate of the DMC/PPG-400 system with the high CO 2 insertion rate of the DMC/sebacic acid (SA) system, achieving 2-3 times higher activity than that of single CTA (PPG-400 or SA), reaching 0.5 kg/g. The molecular characteristics of the CO 2 -based polyols synthesized by different DMC/CTAs systems were analyzed by FTIR and 1 H NMR. The reasons for the high catalytic activity of the DMC/c-CTA system were elucidated by analyzing the hydrogen bond distribution in each DMC/CTA systems. Overall, this work provides a theoretical guidance for the development of novel CO 2 -based materials with high industrial application value.
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Advanced Science
·
2024
·
IF 14.3
Cuiqin Fang,Jing Han,Qingjun Yang,Zhenguo Gao,Di Tan,Tiandi Chen,Bingang Xu
MXene-based Zn-ion capacitors (ZICs) with adsorption-type and battery-type electrodes demonstrate high energy storage and anti-self-discharge capabilities, potentially being paired with triboelectric nanogenerators (TENGs) to construct self-powered systems. Nevertheless, inadequate interlayer spacing, deficient active sites, and compact self-restacking of MXene flakes pose hurdles for MXene-based ZICs, limiting their applications. Herein, black phosphorus (BP)-Zn-MXene hybrid is formulated for MXene-based ZIC via a two-step molecular engineering strategy of Zn-ion pre-intercalation and BP nanosheet assembly. Zn ions as intercalators induce cross-linking of MXene flakes with expandable interlayer spacing to serve as scaffolds for BP nanosheets, thereby providing sufficient accessible active sites and efficient migration routes for enhanced Zn-ion storage. The density functional theory calculations affirm that zinc adsorption and diffusion kinetics are significantly improved in the hybrid. A wearable ZIC with the hybrid delivers a competitive areal energy of 426.3 µWh cm −2 and ultra-low self-discharge rate of 7.0 mV h −1 , achieving remarkable electrochemical matching with TENGs in terms of low energy loss, matched capacity, and fast Zn-ion storage. The resultant self-powered system efficiently collects and stores energy from human motion to power microelectronics. This work advances the Zn-ion storage of MXene-based ZICs and their synergy with TENG in self-powered systems.
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CHINESE CHEMICAL LETTERS
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2024
·
IF 9.4
Yan-Kai Zhang,Yong-Zheng Zhang,Chun-Xiao Jia,Fang Wang,Xiuling Zhang,Yuhang Wu,Zhongmin Liu,Hui Hu,Da-Shuai Zhang,Longlong Geng,Jing Xu,Hongliang Huang
ABSTRACT The highly desired goal is to employ visible light for the photocatalytic reduction of toxic Cr(VI) to environmentally friendly Cr(III). Metal-organic frameworks (MOFs) are considered one of the most promising materials for the photoreduction of Cr(VI). Nevertheless, developing MOFs with high stability and activity is still challenging. Herein, we report a stable Zn-based MOF (named DZU-64 ) with an anthracene functionalized ligand, and its reduction of Cr(VI) under sunlight irradiation was investigated. DZU-64 exhibits excellent chemical stability in pH range of 2−14 aqueous solution, and remarkable thermal stability to 570°C. For the photoreduction of Cr(VI) under visible light irradiation, DZU-64 gives a record rate constant of 0.467 min −1 and a high Cr(VI) reduction rate of 6.68 mg Cr (VI) g −1 cata min −1 at pH 2. Moreover, under real solar light, DZU-64 can also efficiently reduce Cr(VI) to Cr(III) while retaining its catalytic activity throughout 5 cycles without any notable decline, further demonstrating its great application prospect. By combining the photovoltaic performance tests and electron spin resonance test, the possible photoreduction of Cr(VI) mechanism in DZU-64 was analyzed.
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MICROCHEMICAL JOURNAL
·
2025
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IF 5.1
Zhi Luo,Jing Li,Shenglan Hu,Lingling Zheng,Lixin Xu,Biyang Deng
In this study, Ru(bpy) 3 2+ and oxalate (C 2 O 4 2− ) in Ru@Zn-MOF generated self-enhanced electrochemiluminescence (ECL). The self-enhanced ECL composite exhibited a short electron transfer distance and minimal energy loss, which ensured the high and stable luminescence efficiency of Ru@Zn-MOF. A MnO 2 @AuNPs nanocomposite was introduced into Ru@Zn-MOF via antigen–antibody interactions in the presence of squamous cell carcinoma antigen (SCCA). This significantly quenched the ECL signal due to the combined effect of the dual quenchers, MnO 2 NFs and AuNPs. A highly efficient ECL-RET immunosensor was constructed for the sensitive detection of SCCA in the linear range of 1 fg/mL to 100 ng/mL, with a limit of detection of 0.26 fg/mL (S/N = 3). This immunosensor has broad clinical applications for the quantitative detection of biomarkers.
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BIOMATERIALS
·
2025
·
IF 12.9
Xiangyu Liu,Biao Ma,Sihan Hu,Dandan Li,Chun Pan,Zhuobin Xu,Hao Chen,Yongxiang Wang,Huihui Wang
Dynamic alterations in metal ion concentrations are observed in the pathological process of spinal cord injury (SCI). Hence, strategically supplying metal ions in a phase-adapted manner is promising to facilitate injured spinal cord repair by preventing pathological damage. To achieve this, a chimeric hydrogel microsphere with Mg 2+ -crosslinked methacrylate gelatin as the "shell" and Zn 2+ -loaded poly (lactic-co-glycolic acid) (PLGA) as the "core" was designed. The chimeric microspheres allow continuous delivery of Mg 2+ or Zn 2+ at the exact required phase in SCI pathological process. Early release of Mg 2+ reduced inflammation by diminishing the secretion of proinflammatory cytokines due to changes in macrophage polarization, which further suppressed scar formation to create an ideal space for neural regeneration. The subsequently released Zn 2+ at the late phase effectively promoted neural cell proliferation and regeneration, which was accompanied by activation of mature neurons, interneurons, and motor neurons, leading to significant behavioral recovery. Thus, this study underscores the critical role of metal ions at different phases of injured spinal cord repair and describes the construction of an injectable chimeric hydrogel microsphere carrying distinct metal ions with a core-shell structure. Chimeric microspheres overcome the discrepancy between the inflammatory response and neural regeneration and are a promising therapeutic strategy for injured spinal cord repair.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Xinyu Li,Haoyue Zhao,Xunlong Zhang,Can Ge,Zhan Qu,Ning Qi,Zhe Sun,Yong Du,Jian Fang
Flexible Zn-ion batteries (ZIBs) have been regarded as a promising energy storage solution for flexible electronics. However, the challenges of dendrite growth due to uneven current density distribution and limited anode flexibility have impeded their practical application. Herein, a flexible 3D zinc anode with a dual gradient in porosity and conductivity is presented. This dual-gradient nanofibrous anode exhibits exceptional flexibility and durability, showing less than a 10% change in resistance after 15 000 bending cycles. The vertical gradient distribution in conductivity promotes preferential zinc deposition at the bottom section, while the gradient in porosity facilitates Zn 2 ⁺ ion migration and ensures timely replenishment of the inner space of the membrane. The combination of the 3D structure and dual-gradient design fosters bottom-up zinc deposition, effectively preventing dendrite formation. Symmetric cells with this dual-gradient anode demonstrate outstanding cycling stability, maintaining more than 410 h of operation at a current density of 1 mA cm −2 for 1 mA h cm −2 , surpassing reference samples and most previously reported 3D zinc anodes. The quasi-solid-state ZIBs assembled with this dual-gradient anode exhibit excellent stability under various mechanical deformations. These 3D nanofibrous anodes with dual-gradient designs hold great promise for advancing the practical application of flexible Zn-ion batteries.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 4
·1-13
·
IF 2.8
Wang Hanxiao,Zhang Hong,Li Mei,Zhang You,Li Zhicheng,Leng Senlin
NTC thermistors have broad application prospects, and low-temperature sintering of NTC thermistors is of great significance in reducing sintering costs and is beneficial for preparing multi-layer structured components with lower cost internal electrode conductors. In this work, a low-melting point compound basing on Y 2 Ba 2 Cu 2 O 7 is selected as sintering agent for the preparation of Li-doped Ni–Zn–O (Ni 0.97- x Zn x Li 0.03 O 2 , x = 0.1, 0.3, 0.5, 0.7) ceramic thermistors. The sintering temperature can be reduced by more than 250 °C comparing with the one of the related ceramics without sintering aid (NiO ceramics was sintered at 1400 °C). The fabricated Li-doped Ni–Zn–O ceramics consist of single salt-rock NiO phase for x ≤ 0.3 and are composed of NiO-rich and ZnO-rich phases for x = 0.5 or 0.7. All ceramics show typical NTC characteristics with a wide-range adjustable material constant ( B values ranging from 756 to 4967 K). The Ni–Zn–O ceramics have high aging stability with the resistance shift rates induced at 125 °C lower than 1.89%. The microstructure, conduction modes and aging mechanism were investigated using the XRD, SEM, XPS, and electrochemistry impedance spectra.
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