PLoS One
·
2024
·Vol. 19
·期 10
·e0311239
·
IF 2.9
Zhijia Miao,Xueqiang Song,Xiaolei Wang,Hao Wang,Shuoyang Li,Zhen Jiao
To remove phosphate from water, a novel Fe-doped ZIF-8 was synthesized as a superior adsorbent. The Fe-doped ZIF-8 was fully characterized using different characterization techniques and it was found that the as-prepared Fe-doped ZIF-8 (denoted as ZIF-(2Zn:1Fe)) showed a polyhedral morphology with a large specific surface area of 157.64 m 2 /g and an average pore size of 3.055 nm. Analyses using Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction showed that Fe atoms were successfully incorporated into the ZIF-8 skeleton. Batch experiments demonstrated that the molar ratio of Fe and Zn has effects on phosphate adsorption. The adsorption kinetics conformed to a pseudo-second-order model with a high correlation coefficient ( R 2 = 0.9983). The adsorption isotherm matched the Langmuir model ( R 2 = 0.9994) better than the Freundlich model ( R 2 = 0.7501), suggesting that the adsorption of phosphoric acid by ZIF-(2Zn:1Fe) can be classified as a chemisorption on a homogeneous surface. The adsorption amount was 38.60 mg/g. It was found that acidic environments favored the adsorption reaction and the best adsorption was achieved at an initial pH of 2. Inhibition of adsorption by common anions is NO 3 - > CO 3 2- > SO 4 2- > Cl - . Characterization results indicate that the main mechanism of adsorption is surface complexation interactions.
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Biomedical Physics & Engineering Express
·
2024
·Vol. 10
·期 4
·045004
·
IF 1.3
Mingjia Feng,Yan Li,Yanfang Sun,Tianqi Liu,Khaydar E Yunusov,Guohua Jiang
The transdermal drug delivery based on microneedles (MNs) provides a suitable and painless self-administration for diabetic patients. In this work, the hydrogel-forming MNs were firstly fabricated using poly(vinyl alcohol) (PVA) and chitosan (CS) as matrix. A hypoglycemic drug, metformin (Met), had been loaded into MIL-100(Fe). Then, both of free Met and Met-loaded MIL-100(Fe) were integrated into hydrogel-forming MNs for regulation of blood glucose levels (BGLs) on diabetic rats. After penetrated into the skin, the free Met could be firstly released from MNs. Due to the absorption of interstitial fluid and subsequent release of loaded Met from MIL-100(Fe), leading to a sustainable and long-term drug release behaviors. A notable hypoglycemic effect and low risk of hypoglycemia could be obtained on diabetic rat models in vivo. The as-fabricated hydrogel-forming MNs expected to become a new type of transdermal drug delivery platform for transdermal delivery of high-dose drugs to form a long-term hypoglycemic effect.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xueai Li,Kexin Jin,Xiangyan Qu,Yuning Shi,Chunsheng Wang,Wanchun Guo,Kesong Tian,Yahui Wang,Haiyan Wang
The dispersion of diverse magnetic metallic in a single particle plays an important role in microwave absorption; however, its contribution is not clear due to the challenge of controllable synthesis of magnetic bimetallic nanoparticles in one micro/nanostructure. Herein, a series of magnetic bimetallic nanoparticles separately confined growth in a hollow multi-shell microsphere with proper impedance matching characteristic were prepared, which can be used as theoretical models to elucidate magnetic coupling effect between diverse magnetic metallic nanoparticles in a single particle on electromagnetic attenuation. The coupling effect of magnetic Co and Fe nanoparticles dispersed in different shell effectively enhance the microwave absorption performance of void@Fe@SiO 2 /Co/C particles with minimum reflection loss (RL min ) of −62.3 dB (RL=-20 dB, 99 % absorption) at a thickness of 2.05 mm, provoking the maximum radar cross-section (RCS) reduction value of perfect electric conductor (PEC) 37.37 dBm 2 . Meanwhile, broad effective bandwidth (EBW, RL≤-10 dB, ≥90 % absorption) response of 7.04 GHz at a thickness of 2.44 mm was achieved. These findings can provide guidance for the designation of novel magnetic broadband microwave absorbing materials (MAMs).
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xingyu Zhong,Jianing Li,Weiyu Fang,Yuxuan Shen,Mei Bai,Xiulan Hu
The advancement of high-performance oxygen reduction reaction (ORR) catalysts is increasingly responsible for energy development. Iron and nitrogen co-doped carbon materials (Fe-N-C) have garnered extensive attention because of their catalytic activity, which is comparable to that of precious metal-containing catalysts. Nevertheless, the precursor ZIF-8 inevitably forms clusters during the conventional pyrolysis preparation procedure, leading to the coverage of Fe-N active sites and inhibiting catalytic performance. In this study, we induced ZIF-8 to deform into a unique interpenetration twin structure (ZIF-8-IT) by introducing the surfactant cetyltrimethylammonium bromide (CTAB), it has a concave-convex morphology with abundant facets that enhanced interfacial contactability, thereby reducing particle-to-particle interactions and alleviating agglomeration during pyrolysis. The Fe-N-C-IT catalyst prepared using ZIF-8-IT as a precursor exhibited exceptional ORR performance in alkaline media (E 1/2 = 0.898 V, E 0 = 0.983 V). Furthermore, the Fe-N-C-IT based coulomb electrolytic oxygen sensor demonstrated superior performance compared to Pt/C, it achieved an average response time of 66 s within the 100–1000 ppm oxygen concentration range, with only a 4.9 % current fluctuation observed after 28 days at a concentration of 500 ppm oxygen. This study presents a novel strategy for developing efficient oxygen reduction electrocatalysts through morphology engineering.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Cheng Wang,Wenfeng Tan,Xionghan Feng
Iron-based sulfite (S(IV)) activation has emerged as a novel strategy to generate sulfate radicals (SO 4 •- ) for contaminants degradation. However, numerous studies focused on dissolved iron-induced homogeneous activation processes while the potential of structural Fe(III) remains unclear. In this study, five iron (hydr)oxide soil minerals (FeO x ) including ferrihydrite , schwertmannite , lepidocrocite , goethite and hematite , were successfully employed as sources of structural Fe(III) for S(IV) activation. Results showed that the catalytical ability of structural Fe(III) primarily depended on the crystallinity of FeO x instead of their specific surface area and particle size, with ferrihydrite and schwertmannite being the most active. Furthermore, in-situ ATR-FTIR spectroscopy and 2D-COS analysis revealed that HSO 3 - was initially adsorbed on FeO 6 octahedrons of FeO x via monodentate inner-sphere complexation, ultimately oxidized into SO 4 2- which was then re-adsorbed via outer-sphere complexation. During this process, strong oxidizing SO 4 •- and •OH were formed for pollutants degradation , confirmed by radical quenching experiments and electron spin resonance . Moreover, FeO x /S(IV) system exhibited superior applicability with respect to recycling test, real waters and twenty-six pollutants degradation. Eventually, plausible degradation pathways of three typical pollutants were proposed. This study highlights the feasibility of structural Fe(III)-containing soil minerals for S(IV) activation in wastewater treatment .
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yijiang Ge,Qinrui Sun,Hongtao Bai,Jingde Li,Xiaohang Du
Degradation of organic pollutants by in-situ electrochemically synthetic hydrogen peroxide (H 2 O 2 ) in electro-Fenton (EF) system is important for the treatment of wastewater. In this work, a Fe, Mo co-doped N@TiO 2 electrocatalyst was constructed for H 2 O 2 generation and applied to the degradation of organic dyes. The FeMoN@TiO 2 catalyst in 0.1 M KOH exhibits excellent 2e - Oxygen reduction reaction (ORR) activity and stability, with a yield of up to 1409 mmol gcat -1 h −1 and Faraday efficiency (FE) of 83.4 % at −0.7 V (relative to SCE) for more than 10 h. The in situ generated H 2 O 2 delivers benign organic dyes degradation ability with high methylene blue (MB) removal rate of 98.2 % after 2 h in 0.1 M KOH without adding Fe 2+ . After adding Fe 2+ , the EF process occurs to degrade dyes more efficiently, with Congo red and phenol removal rates of more than 99.0 % and Ciprofloxacin (CIP) removal rate of more than 96.0 % in 0.1 M Na 2 SO 4 solution. It is found that Mo doping increases the active sites of the catalyst, while the dopant of Fe can enhance can improve the electron transfer rate between the catalyst and reactants. Additionally, the synergistic Fe and Mo modulate the electronic structure of Ti, increasing the concentrations of Ti 3+ and chemiadsorbed O. This enhances the electronic conductivity and the reactivity of the catalyst, leading to improved ability for H 2 O 2 generation and organic pollutants degradation. Radical quenching experiments show that the in-situ generated H 2 O 2 reacts with added Fe 2+ to produce a large amount of ·OH, which is the main active substance for organic pollutants degradation. This study provides new insights for non-precious metal oxides to replace precious metals towards in-situ production of H 2 O 2 and degradation of pollutants.
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ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Min Zhu,Zongqiang Sheng,Zhifen Fu,Yang Li,Juan Gao,Chao Zhang
Exploring cost-effective non-noble metal-based catalysts with high activity and stability is of great significance for energy conversion and storage involving oxygen evolution reaction (OER). Here, we employed a laser irradiation technique to synthesis Fe doped CoO nanoparticles with ultrafine size (≈ 5.4 nm) and abundant oxygen vacancies (Fe-O v -CoO). The ultrafine size of Fe-O v -CoO nanoparticles provides more active sites to be exposed. Fe doping and oxygen vacancy promote the intrinsic activity and electron transfer rates of Fe-O v -CoO, giving rise to high activity and stability catalyst for OER. Fe-O v -CoO delivers a large current density of 1000 mA cm −2 at an overpotential of 548 mV, which is much better than commercial RuO 2 . Moreover, Fe-O v -CoO presents a remarkable long-term stability with negligible degeneration at a high current density of 500 mA cm −2 for 120 h. This work provides a new route to develop OER electrocatalyst with high activity and stability.
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AICHE JOURNAL
·
2025
·
IF 4
Lizhi Wu,Ying Zhang,Caixin Zou,Qin Sun,Baozhen Li,Wenchun Zheng,Jiamin Liu,Juncheng He,Yu Tang,Li Tan
Ethane dehydrogenation to aromatics (EDA) is one of the most promising routes to produce aromatics. Herein, the tandem of dehydrogenation component and acidic zeolite are prepared and investigated for EDA. Pt/Fe-S-1 coupled with ZSM-5 of Si/Al of 14 via mixing homogeneously shows excellent EDA performance with 54.0% ethane conversion, 61.5% aromatics selectivity as well as a deactivation rate constant of 0.00010 h −1 . According to catalysts characterizations and controlled experiments, it is confirmed the highly dispersed positive Pt δ + species around Fe species over Pt/Fe-S-1 is the active sites for ethane dehydrogenation to ethylene and subsequent naphthenes dehydrogenation to aromatics, Brønsted acid sites of ZSM-5 and MFI pore are responsible for ethylene oligomerization and cyclization to naphthenes and further naphthenes dehydrogenation to aromatics. The short spatial space between dehydrogenation active sites and acid sites is beneficial for EDA. And the ethylene generation rate is the rate-determining step of EDA.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xin Liu,Liping Yang,Li Chen,Shuxia Li,Peng Li,Yongrong Sun,Ning Kang,Chenglong Wang
It is still challenged to propose a straightforward and in-situ growth method of fabricating perovskite-type metal oxide films with dense and uniform surface coverage. This paper presents a simple strategy to prepare LaBO 3 (where B = Ni, Co, Fe, Mn) films by metal oleate (MO) route, in which metal oleates (La(OA) 3 and (B(OA) x , x = 2 or 3) serve as effective ligands to inhibit the self-aggregation among crystal grains. The as-prepared LaNiO 3 film with uniform and dense surface shows a reduced contact angle (31.5° vs 51.2°) and surface roughness (Ra = 14.2 vs 23.9 nm) compared with film prepared by Sol-gel (SG) method. Finally, the LaNiO 3 film by MO route is successfully employed as hole transport layer (HTL) in perovskite solar cells (PSCs) to obtain a power conversion efficiency (PCE) up to 15.62 %, which is 1.54 times that of PSCs by SG method. This work opens an avenue for fabricating LaBO 3 films with dense and uniform surface coverage by MO route.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zhenlei Wang,Yinxing Zhao,Tingting Zhang,Sizhe Lai,Qiwu Zhang,Yunliang Zhao
Arsenic (As) contamination in industrial wastewater on a large scale has posed a enormous threat to ecological security in recent decades. However, a key challenge at present is the efficient and cost-effective removal of As contamination, as Fe in the As removal process cannot quickly and stably form an active phase with high activity for arsenic removal. Here, we propose a strategy to use mechanical activation of dolomite to regulate the formation of newly formed Fe-hydroxide from Fe(II) with high arsenic-removal activity, while stably regulating the pH of water in the near-neutral range, thereby substantially improving the removal efficiency as well as the stability of Fe(II) for As. Activated dolomite can significantly enhance the oxidation rate of Fe(II) in water, and synergistically remove As contamination over 99.5 % of water with an initial concentration of 50 mg/L within 2 h, far superior to the performance of single Fe(II) or dolomite&Fe(II). The simulation and characterisation results reveal that in the presence of activated dolomite, the solution pH as well as the oxidation rate of Fe(II) are effectively regulated, which promotes the As in the solution to be significantly immobilised on the surface of activated dolomite as a ternary precipitate of Ca/Mg-Fe-As, conducive to the stability of the enhanced As removal precipitation. This study provides new insights into the role of carbonate mineral materials in As transformation, which is important for the efficient and cost-effective purification of As contamination in water.
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Materials Chemistry Frontiers
·
2024
·Vol. 8
·期 14
·2592-2598
·
IF 6
Jinfu Hou,Yongqi Jian,Chengjie Chen,Dengke Zhang,Fangyan Xie,Jian Chen,Yanshuo Jin,Nan Wang,Xiang Yu,Hui Meng
FeNC is a promising non-precious metal catalyst that can replace platinum-based catalysts in proton-exchange membrane fuel cells (PEMFCs) and zinc–air battery applications. The study utilized Fe-ZIF-8 as a precursor to improve the oxygen reduction reaction (ORR) activity of the catalyst. This was achieved by growing ruthenium particles of approximately 0.32 μm in situ using a physical milling method under a reducing gas atmosphere. This paper demonstrates that in situ grown ruthenium nanoparticles can alter the spin state of iron atoms from the high-spin state FeN4(II)-(t42ge2g) to the medium-spin state FeN4(II)-(t52ge1g). This alteration changes the interactions of the π* antibonding orbitals of the oxygen and thus improves the ORR activity. The rotating ring-disk (RDE) electrode test resulted in a half-wave potential of (E1/2) + 0.80 V vs. RHE in 0.1 M HClO4, indicating remarkable ORR performance. Zinc–air battery tests showed a high peak power density of 148 mW cm−2.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Baixin Liu,Xuelian Chen,Guojuan Hai,Wenwen Zhao,Kai Li,Zhicong Yuan,Xiaoyong Zhang
The design and synthesis of metal–organic frameworks (MOFs) for direct use as electrode materials are crucial for enhancing the electrocatalytic oxygen evolution reaction (OER). Herein, the ultrathin MIL-53(Fe) nanosheet arrays with enriched coordinatively unsaturated metal sites (denoted as MIL-53(Fe)/NF-B0.2-2) are obtained under the inhibition and modulation of benzoic acid (BA) ligands via a substitution-suppression process. The results confirm that this unique ultrathin structure effectively increases the electrochemical active surface areas (ECSA) and exposes the coordinatively unsaturated metal sites. More importantly, the enriched coordinatively unsaturated metal sites acting as active sites facilitate the adsorption of OH– during the OER process. Additionally, MIL-53(Fe)/NF-B0.2-2, with its optimized energy band structure, exhibits superior charge transfer ability and diffusion processes, significantly improving the reaction kinetics in alkaline electrolytes. As a result, the MIL-53(Fe)/NF-B0.2-2 electrode only requires extremely low overpotentials of 190 and 229 mV to reach current densities of 10 and 100 mA cm–2 for OER, respectively. This research not only proposes a novel strategy for designing efficient electrocatalysts but also provides insights into the structure–activity relationship, advancing the rational design of MOFs as effective electrode materials.
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