JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Haoyuan Zheng,Yuxiao Jia,Chen Jin,Hang Che,Chia-TseLee,Guang Liu,Li Wang,Yuyuan Zhao,Shixuan He,Haizhen Liu,Xinhua Wang,Yifeng Yu,Mi Yan
The magnesium based metal hydrogen storage composite system Mg(NH 2 ) 2 -2LiH has a theoretical hydrogen storage capacity of 5.6 wt.% and is a promising hydrogen storage material for vehicles. However, its application is limited due to serious thermodynamic and kinetic barriers. Introducing efficient catalysts is an effective method to improve the hydrogen storage performance of Mg(NH 2 ) 2 -2LiH. This article investigates for the first time the use of nano rare earth oxide CeO 2 (∼44.5 nm) as an efficient modifier, achieving comprehensive regulation of the hydrogen storage performance of Mg(NH 2 ) 2 -2LiH composite system through oxygen vacancy driven catalysis. The modification mechanism of nano CeO 2 is also systematically studied using density functional theory (DFT) calculations and experimental results. Research has shown that the comprehensive hydrogen storage performance of the Mg(NH 2 ) 2 -2LiH-5 wt.% CeO 2 composite system is optimal, with high hydrogen absorption and desorption kinetics and reversible performance. The initial hydrogen absorption and desorption temperatures of the composite system were significantly reduced from 110/130°C to 65/80°C, and the release of by-product ammonia was significantly inhibited. Under the conditions of 170°C/50 min and 180°C/100 min, 4.37 wt.% of hydrogen can be rapidly absorbed and released. After 10 cycles of hydrogen release, the hydrogen cycle retention rate increased from 85% to nearly 100%. Further mechanistic studies have shown that the nano CeO 2− x generated in situ during hydrogen evolution can effectively weaken the Mg–N and N–H bonds of Mg(NH 2 ) 2 , exhibiting good catalytic effects. Meanwhile, oxygen vacancies provide a fast pathway for the diffusion of hydrogen atoms in the composite system. In addition, nano CeO 2− x can effectively inhibit the polycrystalline transformation of the hydrogen evolving product Li 2 MgN 2 H 2 in the system at high temperatures, reducing the difficulty of re-hydrogenation of the system. This study provides an innovative perspective for the efficient modification of magnesium based metal hydrogen storage composite materials using rare earth based catalysts, and also provides a reference for regulating the comprehensive hydrogen storage performance of hydrogen storage materials using rare earth catalysts with oxygen vacancies.
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高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 42
·21029-21038
·
IF 9.931
Liang Zhang,Jing Wang,Xinyi Ren,Wentao Zhang,Tianshu Zhang,Xinnan Liu,Ting Du,Tao Li,Jianlong Wang
The excessive accumulation of toxic copper species makes it imperative to develop smart dual-functional materials for the simultaneous removal and detection of Cu(II) in drinking water. In this work, novel core–shell NH2-MIL-101(Al)@ZIF-8 nanoflowers were successfully fabricated via an internal extended growth mode under the regulation of polyvinylpyrrolidone (PVP) to achieve this goal. Benefiting from the specific affinity of imidazole nitrogen in ZIF-8 toward Cu(II), the resultant NH2-MIL-101(Al)@ZIF-8 shows high adsorption capacity (526.74 mg g−1). Moreover, the fluorescence of NH2-MIL-101(Al) shows a Cu(II)-dependent change, causing this composite to possess superior selective/sensitive detection with a broad linear range (1.5–625 μM) and a low detection limit (0.17 μM) for Cu(II). Specifically, the hybrid MOF@MOF structure provides greater sensitivity as compared to the individual constituent (pristine NH2-MIL-101(Al)) and the mixed state, which is ascribed to the rational optimization of the smart adsorbent based on the following two aspects. (i) The synergistic effect of the core–shell nanostructure improves the preconcentration ability at the interface between single MOFs. (ii) The existence of the three-dimensional hierarchical nanoflower architecture (structure optimization) accelerates the mass transport and sculpts the final composite with enhanced adsorption and detection ability. These indicate that the smart NH2-MIL-101(Al)@ZIF-8 nanoflower could be an excellent candidate for the synchronous remediation and selective detection of Cu(II) in aqueous systems, which could be potentially useful in wastewater treatment and water quality monitoring.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 17
·14228-14239
·
IF 2.779
Liu Jieling,Yang Jiaji,An Shuyue,Wen Meiqi,Wang Xian,Gong Rongzhou,Nie Yan
Metal-organic framework (MOF) crystals have promising applications in a number of different fields, but the growth of MOF crystals with controllable morphology and high uniformity remains a major challenge. By taking the advantage of the synergistic effects of water molecules in the mixed solvent and polyvinylpyrrolidone (PVP) surfactants, this work demonstrates an approach for the preparation of NH 2 -MIL-88B(Fe) MOF crystals with both highly customizable size and aspect ratios and high uniformity. The effects of the concentration of water in the mixed solvent and the amount of PVP surfactants on the morphology and size of the MOF crystals were investigated. The morphology and crystalline properties were characterized by scanning electron microscopy and X-ray diffraction techniques. The data showed that through controlling the concentration of water in the solvent and the amount of the PVP surfactant, the size of the MOF crystals can be tuned rather widely, over 344–5.14 μm, while the aspect ratio of the crystals can be varied widely over 1.0–7.1. Possible mechanisms for such high tunability were discussed. As an example of potential applications, the complex permeability and permittivity of MOF-derived composites (25 wt%) were measured over a wide frequency range of 2–18 GHz. The parameters were then used to evaluate the potential for electromagnetic wave absorption. The results indicate that the composite with a thickness of only 1.2 mm exhibits a “− 10 dB” absorption bandwidth of 4.1 GHz and a minimum reflection of − 20 dB. Such bandwidth and reflection properties provide inspiration for future design of lightweight, broadband electromagnetic wave absorbers from the perspective of fine morphology control.
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REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Chuang Zhou,Ziming Yang,Li Zhang,Enming Dong,Zuyu He,Xianwu Liu,Chao Wang,Yan Yang,Jing Jiao,Yunhao Liu,Yu Chen,Puwang Li
In this work, carboxymethyl chitosan-graft-eleostearic acid (CMCS-g-EA) was synthesized via the amide reaction between the amino groups of carboxymethyl chitosan and the carboxyl group of eleostearic acid, and then mPEG-NH 2 was grafted to CMCS-g-EA to prepare amphiphilic polymers (mPEG-CMCS-g-EA). The chemical structures of the above conjugates were characterized by FT-IR and 1 H NMR. Both CMCS-g-EA and mPEG-CMCS-g-EA based nano-vesicles were prepared by ultrasonic self-assembly method and they exhibited a low critical aggregation concentration (CAC) of 14.97 μg/mL, 16.82 μg/mL, respectively. The spinosad-loaded mPEG-CMCS-g-EA nano-vesicles (SSD@mPEG-CMCS-g-EA NVs) were spherical in shape with an average diameter of 502.8 nm and the zeta potential of −25.60 mV. The encapsulation efficiency (EE) and drug loading content (LC) of SSD@mPEG-CMCS-g-EA nano-vesicles were 42.00%, 23.07%, respectively. In vitro release revealed that the SSD@mPEG-CMCS-g-EA nano-vesicles exhibited a sustained and pH-responsive drug release property, and could significantly enhance the photostability of spinosad . Furthermore, the toxicological tests demonstrated that the SSD@mPEG-CMCS-g-EA nano-vesicles could efficiently inhibit the growth and development of Helicoverpa armigera . These results indicated that the SSD@mPEG-CMCS-g-EA nano-vesicles were highly potential for the treatment of Helicoverpa armigera .
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yi Wen,Chenguang Qian,Bowen Cui,Boxuan Tian,Chunquan Li,Hang Li,Fang Yuan,Zhiming Sun
Photocatalytic CO 2 reduction harnesses sunlight to convert CO 2 into fuels (e.g., CO, CH 4 ) to address global warming and energy shortages, but faces challenges like high cost and low efficiency. In this work, NH 2 -MIL-125(Ti)/diatomite composites were prepared by one-step solvothermal method using diatomite as a support. Characterization indicated that NH 2 -MIL-125(Ti) units were grown in-situ on diatomite through surface-mediated interactions with Si-O-Ti bonds. This process significantly reduced the agglomeration of NH 2 -MIL-125 particles. Among the resulting composites, NH 2 -MIL-125/DE-60 % had the best photocatalytic activity with a CO production rate of 7.36 μmol g −1 h −1 , which is 1.56 times higher than NH 2 -MIL-125. In four cycles, the yield remained above 6.88 μmol g −1 h −1 . Meanwhile, electrochemical characterization revealed that composite enhances the separation efficiency of photogenerated carriers and reduces carrier migration resistance. The excellent performance of NH 2 -MIL-125/diatomite composites could be attributed to the synergistic effects of its better dispersion and the Si-O-Ti interface formation, which improve light absorption, increase the number of active sites and facilitate charge separation. Meanwhile, the specific mechanism of CO 2 reduction by NH 2 -MIL-125/diatomite composites and its reduction pathway were also revealed. In conclusion, this study successfully reduced the agglomeration effect of MOFs, and provided implications for realizing in-situ growth of MOFs on mineral surfaces.
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PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 22
·12459-12470
·
IF 2.936
Minghua Wang,Longyu Yang,Jinyun Yuan,Linghao He,Yingpan Song,Hongzhong Zhang,Zhihong Zhang,Shaoming Fang
A series of bismuth sulfide (Bi2S3) nanorods and amine-functionalized Ti-based metal–organic framework heterojunctions [denoted by Bi2S3@NH2-MIL-125(Ti)] were constructed and explored as bifunctional photocatalysts for Cr(VI) reduction and rhodamine B (RhB) degradation under visible light illumination. Compared with the individual NH2-MIL-125(Ti) and Bi2S3, the as-synthesized Bi2S3@NH2-MIL-125(Ti) photocatalyst exhibited an enhanced photocatalytic activity toward Cr(VI) and RhB owning to the synergetic effect between Bi2S3 and NH2-MIL-125(Ti). Moreover, the Bi2S3@NH2-MIL-125(Ti) heterojunctions showed increased Cr(VI) removal efficiency by adding RhB in the system. The photocatalytic mechanism was proposed based on the analysis of different scavenger for active species and electron spin resonance spectrometry. The introduction of Bi2S3 into NH2-MIL-125(Ti) can extend the light adsorption and improve the transfer and separation of photogenerated charge carriers through the Bi2S3@NH2-MIL-125(Ti) heterojunction with unique band gap structure. The synthesized Bi2S3@NH2-MIL-125(Ti) photocatalyst also exhibited good reusability and stability.
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PubMed
高影响因子
Analytical Methods
·
2018
·Vol. 11
·期 1
·105-112
·
IF 2.073
Peige Qin,Yixin Yang,Wenqi Li,Jing Zhang,Qian Zhou,Minghua Lu
In this work, amino-functionalized mesoporous silica nanospheres (MSN-NH2) were synthesized and demonstrated as useful sorbents of dispersive solid-phase extraction (dSPE) for extraction and preconcentration of synthetic dyes (tartrazine, amaranth, sunset yellow, allura red, and orange II) from foodstuffs prior to high-performance liquid chromatography (HPLC) analysis. The MSN-NH2 was characterized by transmission electron microscopy, Fourier-transform infrared spectroscopy, nitrogen adsorption and desorption isotherms, and elemental analysis. To achieve optimized extraction efficiency, several critical factors including amount of MSN-NH2, sample pH, adsorption time, adsorption temperature, desorption time, and desorption solvents, were systematically investigated. Under the optimized conditions, the enrichment factors were higher than 120. The limits of detection were found to be 0.10–0.30 ng mL−1. The method showed excellent linearity in the range of 0.45–1000.0 ng mL−1 with correlation coefficients (R2) ≥ 0.9951. The intra-day and inter-day precision (n = 5) were 1.72–3.64% and 1.45–4.52%. The recoveries at three concentration levels ranged from 82.7 to 116.3%. The proposed dSPE by using MSN-NH2 as sorbent coupled with HPLC was successfully applied to the analysis of synthetic dyes in real samples.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2025
·
IF 4.7
Chen-Yuan Ma,Yu-Ming Pan,Pei Han,Mei-Hong Duan
Development of new birefringent crystals with enhanced properties remains an ongoing research priority. Through the exploration of guanidinium-containing oxalates with the structural modulation of Pb 2+ and Cl - , a new birefringent crystal, [C(NH 2 ) 3 ]Pb(C 2 O 4 )Cl·H 2 O (GPCCH), was successfully obtained. GPCCH was characterized by two types of π-conjugated building units, which contributes to the coexistence of a wide bandgap of 3.98 eV and a large birefringence of 0.24@546 nm. These findings highlight the synergistic role of π-conjugated building units and partially-chlorinated lead-containing units played in generating fascinating UV birefringent crystals.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yuhao Liu,Xuyi Wang,Liping Chen,Ming Cheng,Hua Wang,Jiaojiao Shang,Dan Zheng,Beibo Zhang,Jianwu Lan,Shaojian Lin
Heavy metal contamination in water poses a serious global environmental challenge. In particular, hexavalent chromium (Cr (VI)) is particularly concerning due to its carcinogenicity and genotoxicity. In this work, core–shell NH2–UiO-66@UiO-67 nanoparticles (NPs) were in situ stepwise grown on sulfonated polypropylene (PP) nonwoven to fabricate a multifunctional composite (NH2–UiO-66@UiO-67/PP composite nonwoven) for efficient removal of Cr (VI). As expected, the resulting NH2–UiO-66@UiO-67/PP composite nonwoven exhibited dual functionality for efficient Cr (VI) remediation: simultaneous adsorption and visible-light-driven photocatalytic reduction, accompanied by effective sequestration of the resulting Cr (III), due to the presence of NH2–UiO-66@UiO-67 NPs. Under visible light irradiation, the composite achieved exceptional performance, reducing Cr (VI) concentrations from 0.608 mg/L to below 0.004 mg/L and lowering total Cr concentrations from 0.876 mg/L to below 0.004 mg/L, corresponding to a removal efficiency of over 99.6%. The mechanism was elucidated as an integrated adsorption-reduction-fixation process. More importantly, the composite demonstrated outstanding recyclability, retaining 80.0% of its removal efficiency after five regeneration cycles, highlighting its practical potential. Therefore, the as-obtained NH2–UiO-66@UiO-67/PP composite nonwoven can be viewed as a highly efficient material for treating Cr (VI)-contaminated wastewater through an adsorption-photocatalytic reduction pathway.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jiepeng Zhao,Yifei Ma,Zijian Li,Zhaomin Tong,Mei Wang,Liantuan Xiao,Suotang Jia,Xuyuan Chen
This study presents the design of a composite photocatalyst that harnesses the combined effects of internal and external heterojunctions for enhanced performance. The internal heterojunction is achieved by annealing NH 2 -MIL-125(Ti) (NM) under an argon atmosphere, forming an N-doped C-coated anatase/rutile heterostructure (A-NM). By controlling the annealing temperature, the A-NM prepared at 650 °C (A 650 -NM) demonstrates superior photocatalytic CO 2 reduction capability, with an outstanding CO production rate of 0.25 μmol h −1 g −1 under a light intensity of 0.1 W cm −2 . An external heterojunction is then created by combining NM and A 650 -NM in an optimized ratio. At an optimal composite ratio of 9:1 (NM: A 650 -NM), the CO production rate reached 6.3 μmol h −1 g −1 , which is 3.5 times higher than NM and 25 times higher than A 650 -NM. Characterization and DFT analyses reveal that the improved performance stems from the internal heterojunction within A 650 -NM's TiO 2 crystal phases and the external heterojunction between NM and A 650 -NM, which enhanced charge separation and carrier mobility. The N-doped carbon layer further boosts charge carrier transfer efficiency. This work introduces a novel Metal–Organic Framework (MOF)-based photocatalyst for CO 2 reduction, offering valuable theoretical insights and practical strategies for optimizing its performance.
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高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Ai-Hui Cao,Xin-Tai Su,Min Zhang,Qi-Long Zhu
Photocatalytic water decomposition is a cost-effective way to convert sustainable solar energy into chemical energy. While semiconductor photocatalysis has generated considerable interest in photocatalytic hydrogen evolution, it is hampered by fast electron–hole complexation and suboptimal efficiency. Herein, an NH2-MIL-101(Cr)/doped-C3N4 heterojunction possessing a static internal electric field (IEF) is successfully prepared, characterized, and assessed for photocatalytic hydrogen production. The optimized photocatalytic H2 evolution rate of the resultant NH2-MIL-101(Cr)/O–C3N4 is 460 μmol g–1 h–1 under visible light, with an AQY of 2.5% at 450 nm. Spectral evidence indicates that the static IEF facilitates rapid electron transfer from NH2-MIL-101(Cr) to O–C3N4, achieving efficient photogenerated charge separation and a consequent significant enhancement in catalytic activity. This work not only presents a case of construction of an IEF through assembling NH2-MIL-101(Cr) with O–C3N4 but also deepens the insight of the rudimentary mechanisms of the static IEF in heterojunctions for photocatalytic hydrogen evolution.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Siqi Wei,Renjie Li,Ling Li,Dan Huang,Li Wu,Xiandeng Hou
The development of a rapid and accurate assay for the detection of biothiols is critical for early diagnosis and prevention of diseases. Herein, we report that the preparation of photoinduced defective MIL-100-NH 2 (PID-MIL-100-NH 2 ) with oxygen vacancy defects as a surface-enhanced Raman scattering (SERS) substrate by high-energy light irradiation. The substrate exhibited excellent SERS activity to Cys, Hcy and GSH with limits of detection (LODs) as low as 30, 23 and 18 nM, respectively, notably lowering the detectable concentration by at least 10 5 times compared to the Au NP substrate. Such superior SERS activity is attributed to the energy level matching of the PID-MIL-100-NH 2 substrate and the biothiol molecules, which results in efficient multiple charge-transfer resonances, such as photoinduced charge-transfer (PICT), ground-state charge-transfer (GSCT), and exciton resonances. Making good use of the rich fingerprint information, selective identification and simultaneous quantitation of biothiols in complex biological environment can be achieved. Trace biothiols in human serum samples have been successfully determined using this method. This work provides a feasible strategy to construct efficient charge-transfer resonances, enabling high-performance direct SERS sensing of biological small molecules.
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