JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Yaozu Guo,Junhua You,Wenli Pei,Yingdong Qu,Dong Zhao,Zhengwen Yang
This paper reports a novel chemical method to synthesize Nd-Fe-B magnetic nanoparticles . The fabrication mechanism of the particles have been studied through understanding formation of the corresponding intermediate phases as well as their microstructures after annealing and reduction-diffusion processes as function of the (C 2 H 5 ) 3 NBH 3 content. Nd-Fe-B intermediate phases were composed of small Fe 3 O 4 particles and Nd and Fe microcrystals encapsulated with nitriles . Fe 3 O 4 was reduced by BH 3 − into α-Fe as the (C 2 H 5 ) 3 NBH 3 content increased. After annealing, Nd-Fe-B oxide particles gradually agglomerated as the (C 2 H 5 ) 3 NBH 3 content increased, which affected the particle sizes after the reduction-diffusion step. Mixture of Nd 2 Fe 14 B and H 5 Nd 2 was obtained from precursors synthesized with 1.5 and 2.5 mmol of (C 2 H 5 ) 3 NBH 3 . Magnetic properties of these mixtures demonstrated soft magnetic phase characteristics. Relatively pure Nd 2 Fe 14 B nanoparticles with a coercivity of 5.09 kOe and magnetic energy product (BH max ) of 2.862 MGOe were obtained when (C 2 H 5 ) 3 NBH 3 initial content was 3.5 mmol. Exchange coupling nanoparticles of Nd 2 Fe 14 B, Fe 3 B and Fe 2 B were obtained with the coercivity of 3.787 kOe and (BH) max equal to 4.871 MGOe at (C 2 H 5 ) 3 NBH 3 content of 4.5 mmol.
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Journal of Cleaner Production
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2020
·
IF 7.246
Peijie Li,Xiaoxiang Cheng,Weiwei Zhou,Congwei Luo,Fengxun Tan,Zixiao Ren,Lu Zheng,Xuewu Zhu,Daoji Wu
It remains challenging to efficiently mitigate membrane fouling caused by natural organic matter (NOM) for the widespread application of ultrafiltration process. In this study, sodium percarbonate activated with Fe(II) (Fe(II)/SPC) was proposed as a feedwater pretreatment strategy for membrane fouling control. Typical NOM fractions, i.e., humic acid (HA), bovine serum albumin (BSA) were employed as membrane foulants, as well as natural surface water. The results showed that Fe(II)/SPC pretreatment apparently alleviated membrane fouling by BSA and HA-BSA, and the performance outperformed Fe(II) pre-coagulation and SPC pre-oxidation alone. Considering HA fouling, more severe flux decline and increased reversible fouling resistance were obtained, while irreversible fouling was slightly mitigated. The filtration of HA-BSA was well fitted to intermediate blocking followed by cake filtration, and Fe(II)/SPC noticeably increased the filtration volume corresponding to the formation of cake filtration. With Fe(II)/SPC pretreatment, a sparser and more homogeneous foulant layer with lower resistances was observed on membrane surface, and Fourier transform infrared spectroscopy indicated that the peak intensities of major functional groups for organic pollutants were significantly decreased. In surface water treatment, Fe(II)/SPC could effectively improve membrane filtration behavior and pollutants removal, with a distinct decrease of both fluorescent fractions and different molecular weight organic compounds. It seemed that hydroxyl radical oxidation and coagulation with in-situ formed Fe(III) were the main mechanisms of contaminants removal and membrane fouling control. Overall, this combined process exhibited a great potential for actual application during drinking water treatment .
研究领域:
环境工程
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水处理技术
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膜科学
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高级氧化工艺
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JOURNAL OF CHROMATOGRAPHY A
·
2026
·
IF 4
Xueyun Wei,Lanrui Yang,Zhuomin Zhang,Gongke Li
Trace disinfection by-products (DBPs) in aquatic products may have serious impact on human health via direct or indirect consumption. However, the accurate and sensitive quantification of trace chlorophenol DBPs in complex aquatic products still remains a great challenge. In this work, the defective MIL-101(Fe)-NH 2 enrichment medium was prepared for developing a selective membrane solid phase extraction (M-SPE) technology for quantifying trace chlorophenol DBPs in fish, coupled with high performance liquid chromatography-ultraviolet-visible spectroscopy (HPLC-UV). The established analytical method showed good selectivity, sensitivity and accuracy, achieving the limits of detection from 0.03 to 0.15 ng/mL and the recovery from 80.0% to 117%, achieving sensitivity comparable to that of HPLC-mass spectrometry (MS)-based methods. The validated method was successfully applied to quantify chlorophenol DBPs in grass carp and crucian carp, offering a selective and sensitive alternative for monitoring chlorophenol DBPs in fish, with practical advantages for routine analysis via compatibility with widely available HPLC-UV.
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ACS Omega
·
2026
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IF 5.2
Kermue Vasco Jarnda,Heng Dai,Huiting Hu,Yuan Tian,Richmond Anaman,Pian Wu,Ping Ding
Recent advancements in microfluidic paper-based analytical devices (μPADs) have demonstrated their significant potential for point-of-care testing (POCT), particularly in low-resource settings. These devices are especially promising for monitoring glucose levels in patients with diabetes, offering a cost-effective and portable solution. However, one of the primary challenges hindering the widespread adoption of smartphone-coupled μPADs has been their sensitivity to varying ambient lighting conditions, which can interfere with accurate colorimetric detection. To address this issue, researchers have introduced a novel approach involving a metal–organic framework (MOF), specifically Co-TCPP (Fe) [cobalt Fe(III) meso-tetra(4-carboxyphenyl) porphyrin chloride], synthesized using a straightforward method. Co-TCPP (Fe) exhibits remarkable peroxidase-like activity when exposed to hydrogen peroxide (H2O2), enabling it to interact effectively with classic chromogenic substrates and thus improving the colorimetric reaction crucial for accurate glucose detection. In this study, the team developed paper-based μPADs that incorporate the Co-TCPP (Fe) MOF, allowing it to accurately detect glucose levels across a wide concentration range. The limit of detection (LOD) achieved was 5.3 μM, with a linear detection range from 5 to 750 μM. This innovation addresses previous concerns regarding the impact of environmental lighting fluctuations and varying shooting angles, ensuring the reliability of glucose measurements under uncontrolled conditions. By integrating this algorithm into a smartphone-coupled μPAD system, the researchers have created a portable, high-resolution platform that delivers dependable results, even in challenging and fluctuating environments. This breakthrough marks a significant step toward enhancing the practicality and accessibility of glucose monitoring in resource-constrained settings, providing a valuable tool for both clinical and everyday use.
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PROGRESS IN ORGANIC COATINGS
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2026
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IF 7.9
Han Yu,Ying Wang,Zhen Shi,Chenxi Fang,Hang Zeng,Junting Sun,Vilko Mandić,Xuefeng Zhang
Although superhydrophobic coatings have been widely employed for corrosion protection due to their low surface energy, their low surface energy characteristic also results in weak interfacial adhesion and the influence of interfacial adhesion on the overall anti-corrosion performance remains poorly understood. Herein, we explored the corrosion resistance of superhydrophobic coatings on sintered Nd-Fe-B magnets from the perspective of work of adhesion (Wₐ), which represented the interfacial stability and bonding strength. By precisely controlling the PDA shell thickness and the degree of hydrophobization, the work of adhesion can be regulated correspondingly. The results revealed that the overall anti-corrosion performance of superhydrophobic coatings was directly proportional to the work of adhesion. At an optimized Wₐ of 49.44 mN·m -1 , the coated magnet exhibited a low corrosion current density of 1.09 × 10 −8 A/cm 2 , which was three orders of magnitude lower than that of 3.27 × 10 −5 A/cm 2 for bare Nd-Fe-B magnet. Moreover, outstanding protection durability was also demonstrated in both acidic and alkaline environments with robust interfacial contact. In contrast, weak adhesion induced the formation of interfacial gaps, which served as preferred penetration pathways for the corrosive medium. This study evidenced the importance of interfacial structural integrity, revealing the critical role of adhesion layer design in enabling robust and durable anti-corrosion performance of superhydrophobic coatings.
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ACS Sustainable Chemistry & Engineering
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2026
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IF 7.6
Yuhang Zhang,Yuxuan Wu,Jinxia Zhu,Huimin Zhang,Kecan Dou,De-Li Chen,Weidong Zhu,Fumin Zhang
The selective hydrodeoxygenation (HDO) of α,β-unsaturated carbonyl compounds to alkenes offers an atom-economical route for upgrading bioderived molecules but remains challenging due to competing reaction pathways. Herein, we present an Fe single-atom site anchored in an N-doped carbon matrix catalyst (Fe1/NC), synthesized by immobilizing [Fe(bpy)3]2+ complexes into a ZIF-8-derived nitrogen-doped carbon followed by pyrolysis. Structural characterizations reveal atomically dispersed Fe–N4O moieties that, together with the Lewis-basic N sites of the support, create a bifunctional architecture. In the transfer HDO of cinnamaldehyde, Fe1/NC achieves complete conversion and 89.4% selectivity toward alkenes (1-propenylbenzene/allylbenzene) under mild conditions (170 °C, isopropanol as hydrogen donor, 1 MPa N2), surpassing both supported Fe-nanoparticle catalysts and the previously reported Zn-based analogue. Control experiments and theoretical analysis elucidate the detailed reaction pathway, demonstrating that the Fe–N4O sites selectively catalyze carbonyl hydrogenation via the Meerwein–Ponndorf–Verley mechanism with an energy barrier of 1.40 eV, while both the Fe center and adjacent basic N sites on the NC support collaboratively facilitate C–O bond cleavage and subsequent low-barrier hydrogen transfer to form alkenes. This synergistic mechanism between single-atom sites and the functional support enables efficient tandem HDO across a broad substrate scope. The work establishes a rational design strategy for engineering synergistic single-atom catalysts tailored for complex multistep transformations in sustainable chemistry.
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CARBON
·
2025
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IF 11.6
Qunying Wang,Jie Guo,Jiaqing Zhao,Wei Wang,Shan Lu,Junmao Qie,Mark H. Rümmeli,Ruizhi Yang
Due to the high energy conversion efficiency and environmental friendliness, proton exchange membrane fuel cells (PEMFCs) have attracted significant attentions for advancing clean energy technologies. However, the sluggish kinetics of the cathodic oxygen reduction reaction (ORR) severely limits the performance of PEMFCs. The high cost and poor durability of platinum-based electrocatalysts necessitate the development of alternative low-cost transition metal and N co-doped carbon (TM-N-C) catalysts. Nevertheless, the ORR activity of TM-N-C is limited by the low density of exposed active sites TM-N x on carbon. Herein, a combined high internal phase emulsion (HIPE) soft template and ZnO hard template is developed to fabricate porous Fe and N co-doped carbon (HP-Fe-N/C) catalyst. This coupled soft-hard template approach enables the construction of a hierarchical porous structure with high exposure of Fe-N x active sites and significantly promoted mass transport during ORR. The resultant HP-Fe-N/C demonstrates superior ORR electrocatalytic activity, achieving a high half-wave potential of 0.75 V in 0.1 M HClO 4 and 0.89 V in 0.1M KOH aqueous solution. When applied as a catalyst for the cathode of PEMFCs, the HP-Fe-N/C delivers a remarkable peak power density of 528.4 mW cm -2 and a high retention rate of 88.5% of its initial current density after working for 10 hours. This work provides a new approach for the fabrication of well-controlled hierarchical porous carbon-based electrocatalysts for the PEMFC.
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PHYSICAL REVIEW B
·
2019
·Vol. 100
·期 17
·174519
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IF 3.736
B. Lei,L. K. Ma,N. Z. Wang,C. S. Zhu,J. H. Cui,Z. L. Sun,D. H. Ma,H. H. Wang,M. Z. Shi,J. J. Ying,X. H. Chen
Manipulating collectively ordered electronic and magnetic states in a correlated system is at the core of condensed matter physics. Besides tuning the carrier density of a crystal, the latest developed field-effect transistor (FET) with a solid ion conductor (SIC) can also drive ions into the crystal and lead to structural transformations that are difficult to access with conventional methods including conventional field-effect transistors. Here, we exploit the SIC-FET gating technique to realize a metastable phase in (Li,Fe)OHFeS thin flakes, and achieve a rich phase diagram involving superconductivity, soft ferromagnetism, and hard ferromagnetism. With the injection of Li ions into the thin flake, the superconductivity is gradually suppressed and a soft ferromagnetic phase with new crystal structure sets in, evidenced by the anomalous Hall effect and magnetoresistance measurements. Further injecting Li ion drives the soft ferromagnetic state into a hard ferromagnetic state, where different types of magnetic interactions dominate due to the simultaneous tuning of carrier density and magnetic Fe ion concentration in the Li ion injection process. Our paper paves a way to control structural phase transformations as well as physical properties by the electric field. These findings demonstrate the superior performance of the SIC-FET in regulating the physical properties of layered crystals and its potential applications for multifunctional devices.
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Journal of Water Process Engineering
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2023
·
IF 7
Xiying Zhu,Lijia Liu,Yudan Wang,Fuqiu Ma,Yao Tian,Hongxing Dong,Chunhong Zhang
An ideal adsorption material of uranium with not only a high adsorption capacity and high selectivity but also a broad applicability is required. In this study, a porous Fe(III) complex of phosphorylated hypercrosslinked calix[4]arenes (C4HP-Fe(III)) was synthesized. Anchoring Fe(III) via phosphate groups on phosphorylated, hypercrosslinked calix[4]arene (C4HP) significantly improved the uranium-adsorption performance, as evidenced by a 47.9 % increase in the uranium uptake (the adsorption capacity increased up to 497.6 mg·g −1 in a 60-mg·L −1 U solution). C4HP-Fe(III) is a promising adsorbent for uranyl extraction and exhibits fast capture kinetics (the adsorption capacity sharply increased in the first 30 min, which accounted for 86 % of the total amount of uranyl ions adsorbed). A study on the effect of pH on the uranium adsorption of C4HP-Fe(III) suggested that the adsorption capacity was higher than 300 mg·g −1 in the pH range of 5–10, even in a strongly acidic environment of pH 3–4, and it also had a specific adsorption capacity (≥ 168.2 mg·g −1 ). Furthermore, C4HP-Fe(III) possesses excellent ion selectivity for uranyl in simulated wastewater and simulated seawater, and the K d U can reach 4.1 × 10 3 mL·g −1 and 4.4 × 10 4 mL·g −1 , respectively. After 6 cycles, C4HP-Fe(III) maintained its original adsorption capacity of 92.2 %. This makes it useful for wide applications and can be used for capturing uranyl ions from industrial wastewater and natural seawater. The effective extraction of uranyl was mainly attributed to the chelation of uranyl ions with both phosphate groups and active hydroxyl groups (due to the introduction of Fe 3+ ).
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Dianfa Zhao,Jie Liu,Yunshan Zhou,Lijuan Zhang,Yuxu Zhong,Yang Yang,Baoquan Zhao,Mengru Yang,Yong’an Wang
It is very important to establish a sustained-release pralidoxime chloride (2-PAM) drug system with brain targeting function for the treatment of neurotoxicant poisoning. Herein, Vitamin B1 (VB1), also known as thiamine, which can specifically bind to the thiamine transporter on the surface of the blood–brain barrier, was incorporated onto the surface of MIL-101-NH2(Fe) nanoparticles with a size of ∼100 nm. Pralidoxime chloride was further loaded within the interior of the above resulted composite by soaking, and a resulting composite drug (denoted as 2-PAM@VB1-MIL-101-NH2(Fe)) with a loading capacity of 14.8% (wt) was obtained. The results showed that the drug release rate of the composite drug was increased in PBS solution with the increase of pH (2–7.4) and a maximum drug release rate of 77.5% at pH 4. Experiments on the treatment of poisoning by gavage with the nerve agent sarin in mice combined with atropine revealed that sustained release of 2-PAM from the composite drug was achieved for more than 72 h. Sustained and stable reactivation of poisoned acetylcholinesterase (AChE) was observed with an enzyme reactivation rate of 42.7% in the ocular blood samples at 72 h. By using both zebrafish brain and mouse brain as models, we found that the composite drug could effectively cross the blood–brain barrier and restore the AChE activity in the brain of poisoned mice. The composite drug is expected to be a stable therapeutic drug with brain targeting and prolonged drug release properties for nerve agent intoxication in the middle and late stages of treatment.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shanhai Zhao,Yidan Luo,Chunhe Li,Kuankuan Ren,Yanyan Zhu,Weidong Dou
The synthesis of renewable fuel by CO 2 reduction is a promising research direction. The CO 2 reduction reaction may be promoted using photothermal catalysis to achieve efficient CO 2 conversion under mild conditions. In this context, designing efficient catalysts is urgent. In this work, ABO 3 (A = La, Ce; B = Ni, Co, Fe) perovskite catalysts were prepared by coprecipitation and calcination . Experimental results show that the A-site ions and B-site ions in ABO 3 perovskite nanomaterials have a great influence on their structure and photothermal catalytic performance. Among them, the LaNiO 3 catalyst shows excellent photothermal catalytic performance in the conversion of CO 2 to CO and CH 4 , which can generate 0.16 mmol g −1 h −1 CO and 1.38 mmol g −1 h −1 CH 4 at low CO 2 and H 2 concentrations. For the LaNiO 3 sample, its enhancement of catalytic performance mainly benefits from the largest number of active sites, the fastest carrier transport rate, and a relatively suitable band edge position compared with other catalysts. This study proposes a new method for improving the activity and selectivity of photothermal CO 2 reduction and offers a new direction for the recycling of waste gas.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Zixuan Wang,Yonglong Wang,Juping Wang,Weiping Xiao,Guangrui Xu,Zhenjiang Li,Chunlong Dai,Huadong Zhang,Zexing Wu,Lei Wang
Designing highly efficient catalysts act as a key role for the green and sustainable hydrogen production through water electrolysis. In this work, hollow structured B-doped FeP nanospheres supported Ru (Ru/h-B-Fe-P) is developed by low temperature phosphorization, acid etching and following microwave treatment approach. The hollow structure, abundant defects and electronic interactions between Ru and FeP can favour the mass transport and boosting the reaction kinetics toward all-pH hydrogen evolution reaction (HER). Then, Ru/h-B-Fe-P achieves excellent catalytic activities in acidic, neutral, alkaline, and alkaline seawater electrolytes with only 56 mV, 79 mV, 88 mV and 99 mV to drive 10 mA cm −2 with remarkable stability. This work indicates that decorated noble metals onto specific nanostructured matrix is a promising approach to enhance the catalytic activities.
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