Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120944
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IF 7.2
Yong Xiang,Li Xu,Guoji Liu
Efficient recovery of Au(III) from electronic and industrial waste streams is of both economic and environmental importance. Herein, a pore-regulation strategy was developed to construct hierarchically porous NH 2 -MIL-101(Fe 1-x Cu x ). By employing 2-aminoterephthalic acid to coordinate simultaneously with Fe 3 + and Cu 2+ , the unstable Cu–O bonds were selectively removed through a mild acid-soaking treatment, thereby generating enlarged channels and hierarchical micro–mesoporous structures. The optimized framework achieved an Au(III) adsorption capacity of 944 mg g −1 , which was ∼30.7 % higher than that of unmodified NH 2 -MIL-101. Mechanistic studies demonstrated that the hierarchical pore architecture not only facilitated mass transfer but also enhanced accessibility of active sites, synergistically contributing to the superior adsorption performance. This work highlights that rational pore-channel engineering around adsorption sites can substantially boost the recovery efficiency of reducible precious metals, offering a novel design paradigm for advanced MOF-based adsorbents.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Bin Wang,Jin Zhou,Xiang-Yang Zhang,Yu-Shun Yang,Chang-Hong Liu,Hai-Liang Zhu,Qing-Cai Jiao
Enzyme reaction has been accepted widely in numerous applications owing to the high efficiency and stereo-selectivity, as well as simple preparation by gene engineering. However, the fragility and complex purification process of the enzyme are long-standing problems which limit the large-scale application. One possible solution may be the enzyme immobilization. As one type of porous material with high loading capacity and designable functionality, Metal-Organic Frameworks (MOFs) are ideal choices for the immobilization of enzyme with a considerable interest in recent years. In this study, d -amino acid transaminase ( DAT ), an important enzyme for industrial synthesis of d -Ala, was covalently immobilized on the surface of a star MOFs material, UiO-66-NH 2. Interestingly, we found that the nanoscale hybrid enzyme UiO-66-NH 2 -Gd- DAT not only maintained the high catalytic efficiency but also got rid of the interference of polluting enzymes, which meant that we could obtain efficient and stereo-selective immobilized enzyme without complex purification process. In general, our findings demonstrated that using UiO-66-NH 2 might be a promising strategy to immobilize enzyme and produce effective biocatalyst with high activity and stereo-selectivity.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Yingshu Wang,Shuyue Wang,Jiasi Gan,Jinni Shen,Zizhong Zhang,Huidong Zheng,Xuxu Wang
One-pot synthesis of urea [(NH2)2CO] from easily available small molecules, that is, N2, CO2, and H2O, is an extremely attractive but very challenging reaction. 2D-CdS@3D-BiOBr composites with S-scheme heterojunctions are constructed via a facile hydrothermal technique followed by a self-assembly method and shown to be an excellent photocatalyst enabling the reduction of N2 and CO2 with H2O to (NH2)2CO under visible light. The optimal 40%2D-CdS@3D-BiOBr sample shows up to 15 μmol·g–1·h–1 total yield of NH3 and (NH2)2CO, of which (NH2)2CO accounts for 54%. The apparent quantum efficiency (AQE) is 3.93% for urea production. On the photocatalyst, urea is speculated to form by two possible chemical routes. One is direct photocatalytic synthesis. Both N2 and CO2 molecules are activated by the Cd2+ ion of 2D-CdS and the oxygen defect of 3D-BiOBr at the edges of the heterojunction interface of 2D-CdS/3D-BiOBr, respectively. *HNCONH* is the key intermediate of the formation of (NH2)2CO molecules. The other is indirect synthesis by photocatalysis and then thermocatalysis. N2 is reduced into NH3 and CO2 is reduced into CO on 2D-CdS by the photogenerated electrons and protons, and then the formed NH3 reacts with the reactant CO2 or the product CO to form (NH2)2CO by thermocatalysis on 2D-CdS. The former is dominant for urea synthesis. The work confirms that urea could be synthesized photocatalytically from cheap N2, CO2, and H2O under visible light. A composite heterojunction semiconductor could be a prospective photocatalyst appropriate for the complex reaction.
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CHEMOSPHERE
·
2022
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IF 8.943
Cheng Cheng,Dongyun Chen,Najun Li,Hua Li,Qingfeng Xu,Jinhui He,Jianmei Lu
This paper reports the application of NH 2 -MIL-125(Ti) modified carbon nitride C v -C 3 N 4 with carbon vacancies in the removal of NO. We performed a series of characterizations of the complex and compared various ratios with the individual components. The results of UV spectrum analysis show that the composite's range of light absorption expanded due to the modification of Ti metal–organic framework. Furthermore, the results of photocurrent and electrical impedance indicate the compound has a better ability to generate and transfer electrons . The increase in the compound's NO removal efficiency (up to 63%) indicates that MOF has a positive effect on C v -C 3 N 4 modification—a good method for photocatalysis . Moreover, the compound can promote photocatalysis in a favorable direction.
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 23
·6067-6074
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IF 7.779
Man Zhang,Bingbing Zhang,Daqing Yang,Ying Wang
A new birefringent crystal [C(NH2)3]2S2O8 was obtained by combining the π-conjugated [C(NH2)3] cation and the [S2O8] groups with localized O–O π-bonds. Optical measurements show that the UV cutoff wavelength of [C(NH2)3]2S2O8 is 222 nm, and its birefringence is 0.102 at 546 nm. The calculated results show that its large birefringence is attributed to the synergistic effect of the [C(NH2)3] and [S2O8] units, which is the first case among known birefringent crystals. These results provide new insights into the design of superior birefringent materials.
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RSC Advances
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2022
·Vol. 12
·期 38
·24670-24680
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IF 4.036
Wei Qin,Along Yu,Xue Han,Junwei Wang,Jiayin Sun,Jianli Zhang,Yaqing Weng
With the increasing demand for rare earth elements (REEs) due to their wide application in high technology, their recovery and separation from waste sources has gradually come onto the agenda. Herein, a new kind of MIL-101-NH2 (M1N) MOF functionalized with diethanol anhydride (DGA) incorporated into a polyvinylidene fluoride (PVDF) membrane (DGA-M1N@PVDF) has been fabricated for the sorption of REEs from a simulated acid leaching solution of waste phosphor, which contains a large amount of REEs. FTIR, TGA, XRD, fluorescence spectra and XPS analysis were used to characterize the synthesized composite membrane. Batch tests were employed to determine the optimal sorption conditions for Y and Eu adsorbed on DGA-M1N@PVDF adsorbent, such as pH (1–5), content of M1N MOFs (0–40 wt%), contact time (10–180 min) and ion concentration (0–20 mg L−1). Maximum adsorption capacities for Y and Eu on DGA-M1N@PVDF reached 991.7 μg g−1 and 98.76 μg g−1 for trace REE solution, respectively. Moreover, a pseudo-second-order kinetic model accurately described the sorption process, and the plotted isothermal data indicated that the Langmuir model was more suitable than the Freundlich model for Y and Eu sorption with monolayer and chemical adsorption. Meanwhile, FTIR and XPS analyses revealed that the Y and Eu adsorption on the DGA-M1N@PVDF composite membrane was mainly caused by the N and O atoms of the –CONH or –COOH groups coordinated with metal ions. Furthermore, after five cycles, the recovery efficiency by DGA-M1N@PVDF for REEs remains above 82% and the XRD patterns were consistent with the original sample, which implied that the DGA-M1N@PVDF membrane has preferable stability, recyclability and good efficiency in REE separation from waste phosphor solutions.
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ACS Applied Nano Materials
·
2021
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IF 5.097
Nadia Batool,Waseem Iqbal,Xiao-Feng Han,Wen-Tao Wang,Hao-Tian Teng,Xiang Hao,Ruizhi Yang,Jing-Hua Tian
Pt/C is one of the most favorable catalysts with high catalytic activity used in the oxygen reduction reaction (ORR). However, the synthesis of Pt/C with superior durability is still a significant challenge. Here, we introduced a simple technique to fabricate a Pt/N-C catalyst, having ultrasmall Pt nanocrystals encapsulated inside a nitrogen-doped carbon support, which is derived by the UiO-66-NH2 (MOF) using an impregnation technique, followed by a pyrolysis process. This Pt/N-C displays ORR activity and durability in alkaline solution with a half-wave potential of 0.90 V (vs RHE), limited diffusion current density of 5.5 mA cm–2, and only 5 mV deterioration in half-wave potential after testing 20,000 cyclic voltammetry (CV) cycles. In addition, it also shows good performance in acidic solution. In addition, Zn–air batteries (ZABs) assembled using the Pt/N-C air electrode display a high specific capacity of 825 mAh g–1, a high peak power density of 372 mW cm–2, and 208 h long cycle life. This offers an innovative approach for developing noble metal-based catalysts with unusual activity, stability, and a promising future for applications in metal–air batteries and fuel cells.
研究领域:
材料科学
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电催化
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能量存储与转换
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纳米材料
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燃料电池
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金属-空气电池
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2026
·
IF 5.9
Ying-hong La,Wen-jia Ha,Yong-hu Ma,Zhi-qiang Wu,Hong-jian Zhao
In this work, an S-scheme heterojunction photocatalyst composed of Fe-MOF-NH 2 -modified BiOCl (denoted as BFN) was successfully prepared via a one-step hydrothermal technique for the efficient photocatalytic (PC) decomposition of tetracycline hydrochloride (TC-HCl). The morphology, crystal structure, composition, specific surface area, and photoelectric characteristics of BFN were systematically characterized using multiple techniques. XRD patterns confirm the successful fabrication of Fe-MOF-NH 2 /BiOCl (BFN) heterostructures. Introducing Fe-MOF-NH 2 shrinks BiOCl lattices via partial replacement of Bi 3+ with smaller Fe 3+ , which further exposes more active BiOCl (110) facets. SEM images display BiOCl nanosheets evenly grown on spindle hexagonal Fe-MOF-NH 2 to create compact heterointerfaces. This structure optimizes pore configuration and light capture. Owing to its elaborate heterojunction and regulated crystal texture, BET data confirm the optimal BFN possesses a high specific surface area of 116.2 m 2 ‧g −1 . UV–vis DRS further verifies a 420 nm red shift in its light absorption edge. XPS and EPR analyses reveal that the oxygen vacancy concentration in the heterojunction is significantly increased, 3 and 8 times higher compared to those of Fe-MOF-NH 2 and BiOCl, respectively. The compact S-scheme heterojunction constructs a directional charge-carrier transfer pathway. This structure strongly suppresses photocarrier recombination while preserving robust redox potentials. Higher photocurrent density and lower EIS impedance jointly confirm accelerated charge separation. PC experiments demonstrate that the 70% BFN sample achieves markedly higher degradation efficiency for TC-HCl under Light-emitting diode (LED) lamp irradiation compared with the individual components, and the degradation process involves multiple reactive species, including h + , ·O 2 − , and ·OH. LC-MS analysis revealed three possible degradation pathways, and hydroponic toxicity tests using mung bean as the model plant confirmed that the TC-HCl degradation products exhibit substantially reduced biotoxicity and even exert a certain growth-promoting effect. This study unveils the quadruple synergism of extended light absorption, S-scheme carrier migration, abundant oxygen vacancies and enhanced surface adsorption, offering experimental and theoretical support for bismuth/MOF photocatalysts in antibiotic wastewater remediation and agricultural ecological protection.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Mei Yang,Ning Feng,Lukuan Yang,Jinsuo Ma,Wenxin Ji,Yonggang Sun,Yuanyuan Li,Yulong Ma
Synthesis of a B-doped FeMn dual-atom catalyst (DAC), NH 2 –Fe 1 B 2 N 2 –Mn 1 B 1 N 2 . • Regulation of the electronic asymmetry of NH 2 –Fe 1 B 2 N 2 –Mn 1 B 1 N 2 via first-coordination-shell B doping. • B doping induces pronounced local electronic asymmetry and causes d-band shifts. • Improved understanding of the microscopic mechanism of peroxymonosulfate activation over DACs. • Introduction of a general strategy for engineering asymmetric electronic structures in dual-atom catalysts. • Bridging a critical gap between catalyst design and nonradical advanced oxidation processes. Dual-atom catalysts (DACs) are promising for advanced oxidation processes because they inherit the advantages of single-atom catalysts. However, the intrinsic symmetry of their electronic structures limits peroxymonosulfate (PMS) activation and selective nonradical-pathway generation, constraining their practical application. Heteroatom doping in the first coordination shell effectively breaks the electronic symmetry of DACs; however, the mechanism governing selective singlet oxygen ( 1 O 2 ) generation remains unclear. Herein, a B-doped FeMn DAC is synthesized via pyrolysis using boric acid and ZIF-8 as the B and N sources, respectively, to enhance PMS activation and selective 1 O 2 generation. Characterization results and density functional theory calculations reveal that B doping regulates the formation of an axial NH 2 –Fe 1 B 2 N 2 –Mn 1 B 1 N 2 asymmetric electronic structure. In the NH 2 –Fe 1 B 2 N 2 –Mn 1 B 1 N 2 /PMS system, PMS highly selectively adsorbs on the catalyst and coordinates with Mn in a bidentate configuration and Fe serves as an electron-density-regulation center. Through long-range electronic coupling, the active-site electronic structure is optimized. The asymmetric electronic structure considerably enhances antibiotic degradation efficiency in water (97.8%) and increases the reaction rate ( k = 0.12 min −1 ). Overall, this study precisely regulates the electronic asymmetry of NH 2 –Fe 1 B 2 N 2 –Mn 1 B 1 N 2 through first-coordination-shell B doping, elucidates the synergistic mechanism of dual atoms in targeted 1 O 2 generation, and provides a new perspective for designing asymmetric electronic-structure catalysts for advanced oxidation applications. Download: Download high-res image (112KB) Download: Download full-size image
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
ZhenXiang Xu,Yuan Gao,JingLiang Wang,YunHuan Li,YiPeng Zhao,Xin Meng,Xia Feng,Li Chen,YiPing Zhao
Bio-based porous adsorbents for multicomponent air purification are often constrained by limited active-site density, insufficient control over hierarchical pore architectures, and inadequate mechanical robustness. Herein, chitosan was functionalized with poly(amidoamine) (PAMAM) dendrimers of different generations and combined with carboxymethyl cellulose (CMC) and UiO-66-NH 2 to construct nitrogen-enriched composite aerogels. The effects of PAMAM generation and UiO-66-NH 2 loading on the pore architecture, surface chemistry, mechanical response, and pollutant-capture performance of the aerogels were systematically evaluated. The optimized CG 2 MUNA-2 aerogel exhibited a well-connected porous network and sustained a compressive stress of 13.62 MPa at 80% strain. It achieved a CO 2 uptake of 0.64 mmol·g −1 at 273.15 K and a formaldehyde adsorption capacity of 1.57 mmol g −1 , while retaining 92.4% of its initial formaldehyde adsorption capacity after five adsorption-desorption cycles. When incorporated into cigarette filter rods, CG 2 MUNA-2 reduced CO, CO 2 , and total particulate matter by 30.87%, 14.01%, and 62.58%, respectively. Its superior overall performance was associated with a favorable balance among accessible amine functionalities, pore connectivity, and UiO-66-NH 2 dispersion. These results indicate that the coordinated regulation of PAMAM generation and MOF loading offers a rational materials-design strategy for developing biopolymer-based aerogels for multicomponent air-pollutant capture and cigarette-smoke purification. Download: Download high-res image (278KB) Download: Download full-size image
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Zhaoxia Shi,Zhen Luo,Yilu Liu,Yintang Zhang,Yanli Zhou,Maotian Xu
A synergistic MgO@UiO-66-NH₂ nanocomposite was prepared for CTL sensing. • The proposed CTL sensor enables rapid, non-invasive detection of isopropanol. • The sensor exhibits a wide linear range (0.04–120 mg/L) and good stability. • This method offers a potential approach for preclinical lung cancer screening via exhaled breath analysis. Isopropanol (IPA) has been identified as a potential biomarker for lung cancer, and the rapid detection of IPA in exhaled breath may offer a promising strategy for lung cancer screening. In this study, rod-like MgO, MnO₂, and ZnO, along with natural halloysite nanotubes (HNTs), were synthesized and used as carriers to fabricate nanocomposites with a Zr-based metal–organic framework (UiO-66-NH₂). Their catalytic activities toward IPA were evaluated using cataluminescence (CTL) measurements. MgO@UiO-66-NH₂ exhibited the highest catalytic activity, attributed to the synergistic effect between MgO and UiO-66-NH₂ enhancing the redox capacity in the presence of ozone. Based on this composite, a rapid CTL method was developed for IPA detection in exhaled breath. The intra-sensor precision (nine repeated measurements on the same sensor) gave a relative standard deviation (RSD) of 3.41%; inter-sensor reproducibility (seven different sensors) gave an RSD of 3.81%; and long-term stability over seven weeks showed an RSD of 4.3%. The linear range was 0.04–120 mg/L, with a limit of detection of 0.015 mg/L (S/N = 3). When applied to three healthy human exhaled breath samples, the method achieved spiked recoveries ranging from 90.0% to 105.3%. These results demonstrate that the proposed CTL sensor enables rapid, non-invasive detection of IPA and holds great potential for IPA detection in exhaled breath. Download: Download high-res image (143KB) Download: Download full-size image
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Jia Liu,Hailong Yu,Jijuan Jiang,Yang Jia,Guan Wang,Wenqiang Shi,Hongyan Meng
Understanding exciton recombination and exciton-phonon coupling in hybrid perovskite single crystals is essential for developing high-performance linear and nonlinear optoelectronic devices. Herein, we systematically investigate the photophysical processes in formamidinium lead bromide (CH(NH 2 ) 2 PbBr 3 ) single crystals through steady-state photoluminescence (PL), temperature-dependent spectroscopy, time-resolved PL, and Raman analysis. Under 405 nm excitation, dual emission peaks at 555 and 577 nm are assigned to free exciton (FE) and bound exciton (BE) recombination. Time-resolved PL measurements reveal nanosecond-scale lifetimes for FE and longer sub-microsecond lifetimes for BE. Under 800 nm excitation, a single 567 nm emission with a microsecond lifetime is observed, demonstrating two-photon absorption (2PA) induced localization and reabsorption-mediated relaxation. Temperature-dependent PL reveals an activation energy of 72 meV derived from Arrhenius fitting, while the monotonic linewidth broadening is well described by the Boson model with a longitudinal optical phonon energy of 24 meV. An anomalous evolution of the emission features around ∼160 K suggests a possible phase transition, which modulates exciton-phonon coupling and recombination dynamics. Raman spectroscopy further confirms strong electron-phonon interaction and lattice anharmonicity. These results establish a unified picture of FE-BE competition and 2PA-dominated recombination dynamics in CH(NH 2 ) 2 PbBr 3 , providing fundamental insight for perovskite-based lasers, nonlinear photonics, and scintillation devices.
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