APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Yi Tian,Ping Yang,Xiao Zhang
The development of self-colorimetric probes for Fe 3+ detection without external reference remains a significant challenge, despite its critical importance in environmental monitoring and disease diagnosis. In this paper, bright red-emitting carbon dots (r-CDs) with photoluminescence (PL) quantum yield of 35.8 % were synthesized via a one-step solvothermal strategy. The abundant surface hydroxyl/carboxyl groups of r-CDs enabled specific Fe 3+ ion coordination resulted in a novel PL phenomenon, in which the red emitting (650 nm) of the r-CDs changed into green-emitting (500 nm) because of new fluorescent centers formation. pH stability test confirmed the robustness of r-CDs forFe 3+ sensing in a pH region of 2–13.This phenomenon is ascribed to a dual-mode self-colorimetric sensing platform, achieving a detection limit of 10.7 nM and a wide linear range of 0–700 μM in solution. Experimental result confirmed that Fe 3+ coordination triggered electron transfer and lead to new emitting center generation. This bright green emitting was also observed once r-CDs were added a SiO 2 gel with Fe ions, suggesting a significant application in solid-state moist environmental. This novel PL phenomenon is crucial for the preparation and application of CDs.
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CHEMICAL PHYSICS LETTERS
·
2025
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IF 3.1
Kangyue Qiao,Songyao Du,Yue Wang,Tongxin Xiao,Guodong Hao,Chao Sui,Yihan Yan
To address the severe Cr(VI) contamination in industrial wastewater, an NH 2 -MIL-101(Fe)/g-C 3 N 4 type-II heterojunction photocatalyst was synthesized via a solvothermal one-pot method. Structural characterization using XRD, SEM, XPS, and BET confirmed successful composite formation with high specific surface area and favorable interfacial contact. Photocatalytic experiments revealed that under conditions of pH = 2, a catalyst dosage of 20 mg, and an initial concentration of 10 mg/L, NM-101(Fe)/0.2CN achieved a 99.5 % reduction efficiency within 80 min. Its reaction rate constant was 3.6 times higher than that of NM-101(Fe) used alone. This study provides new insights for developing highly efficient MOF/polymer composite photocatalysts.
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WATER SCIENCE AND TECHNOLOGY
·
2025
·Vol. 92
·期 10
·1441-1456
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IF 2.6
Wang Wenhao,Ge Aijun,Xu Yuan,Yang Xuesong,Feng Shiying,Su Ying,Wang Weida,Xing Liqun,Hao Xiujuan
View large Download slide View large Download slide Close modal In the study, a novel Fe/Al bimetal with a high specific surface area and electron transfer capacity was synthesized through ball milling Fe and Al powder. Importantly, this synthesis process did not consume Al powder and did not generate by-products that required treatment. Compared with Fe or Al powder and the ball-milled Fe or Al powder, Fe/Al could rapidly remove Cr(VI) through adsorption–reduction under near-neutral conditions. Nevertheless, the removal efficiency of Cr(VI) by Fe/Al was influenced by the initial pH of the solution and dissolved oxygen (DO). Kinetic studies and adsorption isotherm analysis demonstrated that the pseudo-second-order adsorption kinetic model and the Freundlich model could better describe the Cr(VI) removal data, and the maximum removal amount of Cr(VI) was 6.25 mg/g. Furthermore, based on the characterization analysis of XPS, the adsorbed Cr(VI) was reduced to Cr(III). SEM-EDS analysis revealed that Cr mainly overlapped with the Fe elemental distribution on the surface of Fe/Al particles, suggesting that Fe was the main reaction site. Consequently, the results indicated that highly active Fe/Al could be prepared by solid–solid blending for pollutant removal, which provided technological concepts for the waste utilization of scrap iron and aluminum. Increasing the specific surface area of Fe/Al by ball milling of Fe and Al powder was the key to enhancing Cr(VI) removal. Cr(VI) was mainly removed by adsorption–reduction under near-neutral pH. The removal sites of Cr(VI) by Fe/Al mainly occur on the surface of Fe. The maximum adsorption capacities of Cr(VI) by Fe/Al were 6.25 mg/g.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Renzhi Xiong,Fangde Liu,Jiahao Huang,Yanhe Xiao,Baochang Cheng,Shuijin Lei
Regulation of electron spin polarization (SP) has been demonstrated to significantly influence the reaction rates and pathways of diverse catalytic reactions. However, the application of SP in piezocatalysis and its underlying mechanisms remain poorly understood. In this study, we design a Fe-doped Bi 3 TiNbO 9 piezoelectric semiconductor to synergistically integrate SP and piezocatalysis, optimizing both the kinetics and thermodynamics of H 2 O 2 production. Structural analyses reveal that Fe incorporation enhances the piezoelectric response through inducing off-centering displacement of [TiO 6 ]/[NbO 6 ] octahedra. Crucially, the combination of intrinsic SP form Fe dopants and magnetically enhanced SP substantially improves carrier mobility. Density functional theory calculations further verify that SP greatly reduces the Gibbs free energy barrier for the direct one-step 2e − oxygen reduction reaction (ORR) pathway, successfully shifting the O 2 activation mechanism from the two-step 2e − ORR to the more efficient one-step 2e − ORR. The synergy of these effects enables Fe-doped Bi 3 TiNbO 9 to achieve an exceptional H 2 O 2 yield of 1421.2 μmol g −1 h −1 under mechanical stimulation and magnetic fields — a 10.4-fold enhancement over pristine Bi 3 TiNbO 9 . This work pioneers a new paradigm for mechanical-energy-driven green chemical synthesis by innovatively coupling piezoelectric effects with spintronics.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
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IF 7.8
Huan He,Yixin Liu,Qiuyun Chai,Xiaofang Ma,Chaochao Lai,Ziwei Guo,Guoli Dong,Bin Huang,Xuejun Pan
Conventional plastic waste management through landfilling and incineration not only consumes vast land resources but also emits hazardous compounds, severely endangering ecosystems. An emergent and promising solution is the conversion of this waste into functional carbon-based materials for water purification, enabling sustainable reuse. Herein, four kinds of plastics were pyrolyzed to char doped with Fe and Ca for peroxymonosulfate (PMS) activation to degrade bisphenol A (BPA). The doped char exhibited highly effective adsorption and catalytic capabilities for BPA removal. Fe-doping enhanced the adsorptive removal of BPA by increasing the specific surface area and adsorption sites of the char. The Fe/Ca co-doped catalyst achieved 94.1 % BPA removal within 10 min, while the Ca components effectively reduced post-reaction SO 4 2- accumulation, mitigating secondary ionic pollution. Quenching experiments and EPR analyses confirmed the generation of SO 4 – ·, ·OH, ·O 2 – and 1 O 2 , indicating the coexistence of radical and non-radical oxidation pathways. Moreover, the waste-plastic-derived char with Fe/Ca also exhibited a high BPA removal efficiency of 81.2 %, and the residual toxicity of BPA was markedly reduced after degradation. This study proposes a novel strategy that synergistically combines resource recycling with pollutant removal.
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ACS Earth and Space Chemistry
·
2025
·
IF 2.9
Qi Tao,Yonglei Zhang,Tianqi Zhang,Xiaorong Qin,Binglong Ye,Hongping He,Sridhar Komarneni
Over the past decade, remote sensing exploration has revealed widespread detection of clay minerals in Noachian terrains (>3.7 Ga) on Mars, suggesting a period of active near-surface water–rock interaction. The in-depth characterization of the crystal structure and chemistry of laboratory-synthesized smectite minerals with varying compositions offers a unique perspective to further constrain their formation mechanism, environmental conditions, and the climate of early Mars. This study synthesized smectites with varying Fe/Mg ratios to compare their near-infrared (NIR) spectral characteristics with those of representative areas on Mars. The study revealed that the characteristic metal–OH (M–OH) band in the range of 2270–2320 nm shifted toward longer wavelengths as the octahedral Fe3+ content decreased. When the octahedral Fe/Mg ratio was close to 1, the position of M–OH was similar to that of Mg-smectite (saponite), indicating that although the M–OH band of smectite is located at ca. 2308–2312 nm, it may still contain a significant amount of octahedral Fe3+. This suggests that there are likely still many Fe-smectites in Mg-rich smectite outcrops (ca. 20% as in the literature) on the Martian surface. Furthermore, correlation analysis between the smectite layer stacking order index (V/P) and the second-order derivative band intensity ratio (Deriv2 ratio) showed that when the Deriv2 ratio is small (generally <8), smectite has a relatively high degree of layer stacking order. When the Deriv2 ratio is >10 and tends toward infinity (+∞), the layer stacking order of smectite is very low. The above results suggest that the crystal chemical characteristics of smectites should be carefully studied when analyzing the mineral composition of the Mars surface using remote sensing or in situ NIR spectra. Smectites on Mars generally exhibit a high layer stacking order, indicating the presence of a relatively long-term warm and humid climate in Martian history. However, later alteration processes can significantly reduce their crystallinity.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2025
·
IF 2.9
Jiaqi Li,Yidan Zhang,Pingyu Luo,Chun Li,Fanming Zeng,Tiantian Sun,Hanhui Lei,Xiaoteng Liu,Chunbo Liu
Persulphate-based advanced oxidation technology efficiently and cost-effectively removes organic dyes from water but designing stable photocatalytic systems and understanding their reaction mechanisms remain key challenges. Metal–organic frameworks (MOFs) have attracted considerable research attention for degrading organic pollutants owing to their high porosity, tunable structure, and ease of modification. In this study, a series of M-MOF-74 (M = Co, Fe, Ni) photocatalysts are synthesized by a hydrothermal method for methylene blue (MB) degradation. Among them, the Co-MOF-74 photocatalytic synergetic peroxymonosulfate system exhibits high catalytic activity after 30 min of visible light irradiation. MB degradation efficiency reaches 94.8%, and the reaction rate constant is 0.210 min−1, which is approximately 19.44 times higher than the reaction rate constant of the original Co-MOF-74. Compared with Fe-MOF-74 and Ni-MOF-74, Co-MOF-74 exhibits better photocatalytic performance due to the dynamic changes in the valence state of cobalt, which more effectively facilitate the activation of PMS. In addition, this study analyses the possible degradation pathways of MB in water and toxicological evaluations of intermediate products, providing new insights for the effective removal of dyes in water.
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高影响因子
IONICS
·
2025
·
IF 2.6
Li Dongliang,Wang Xiangnan
La-excess-type lanthanum silicate doped with Fe (La 10 Si 6- x Fe x O 27 , x = 0, 0.2, 0.4, 0.6) was synthesized through planetary ball milling. The resulting materials were systematically characterized for their crystal structure, infrared spectral features, microstructural properties, and electrical conduction behavior. It is revealed that La 10 Si 6- x Fe x O 27 remains apatite type, and Fe is doped into Si site. The surface particles of the La 10 Si 6- x Fe x O 27 ceramic sample are without holes, and the particles are arranged tightly and evenly. The element distribution of La 10 Si 6- x Fe x O 27 ceramic samples is uniform, and the element content conforms to the stoichiometric ratio. Both total and electronic conductivities exhibit a gradual enhancement with increasing iron content. A sensor was fabricated using dense diffusion barrier of La 10 Si 5.4 Fe 0.6 O 27 and solid electrolyte of La 10 Si 6 O 27 . Limiting current meets certain relationship with temperature and oxygen volume fraction, such as lg I L (mA) = − 0.56 − 1.36 × 1000/ T (K −1 ) and I L (mA) = 3.10 + 0.69 × \(\varphi\) (O 2 ) (%). The sensor exhibits CO 2 /H 2 O-insensitive limiting current.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Yuxi Liu,Wenjing Zhang,Weimeng Chi,Yuxuan Liu,Ying Chen,Yuning Liang
As a potential Fenton catalyst, Fe-based organic frameworks (Fe-MOFs) severely limit their application in practical heavy pollution due to their slow cycling rate. In this work, a novel photocatalyst (NH 2 -MIL101(Fe, Cu)/WO 3 ) was synthesized using a two-step hydrothermal method. Research on photocatalytic activity revealed that NH 2 -MIL101(Fe, Cu)/WO 3 , when combined with H 2 O 2 , exhibits higher degradation efficiency compared than pure NH 2 -MIL101(Fe, Cu) or WO 3 alone, achieving up to 90 % degradation of levofloxacin (LEV) under visible light irradiation. In addition, the effects of hydrogen peroxide dosage, pH and other factors on degradation performance were studied, and the results demonstrated good stability even after multiple cycles. This excellent photocatalytic performance is attributed to the formation of heterogeneous structures as well as the doping of copper ions. This not only inhibits the electron-hole recombination, but also improves the redox capacity of the catalyst accelerating the regeneration of Fe 3+ . This work offers a way to enhance the photo-Fenton activity of Fe-MOF-based catalysts.
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CHEMOSPHERE
·
2018
·
IF 4.427
Xukai Li,Weirui Chen,Yiming Tang,Laisheng Li
Fe-MCM-48 catalyst with a three-dimensional cubic pore structure was directly synthesized via a hydrothermal method, and the mineralization efficiency of diclofenac (DCF) in the catalytic ozonation process (Fe-MCM-48/O 3 ) was assessed. X-ray diffraction (XRD), N 2 adsorption desorption, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) characterizations revealed that Fe existed in the framework of MCM-48, and Fe-MCM-48 possessed a large surface area and a highly ordered cubic mesoporous structure, which could accelerate reactants and products diffusion. Regarding mineralization efficiency, the addition of Fe-MCM-48 significantly improved total organic carbon (TOC) removal, and approximately 49.9% TOC were removed through the Fe-MCM-48/O 3 process at 60 min, which was 2.0 times higher than that in single ozonation. Due to this catalyst's superior structure, Fe-MCM-48 showed the better catalytic activity compared with Fe-MCM-41 and Fe loaded MCM-48 (Fe/MCM-48, Fe existed on the surface of MCM-48). DCF removal in the Fe-MCM-48/O 3 process was primarily based on ozone direct oxidation. The improvement of mineralization efficiency was attributed to the function of generated hydroxyl radicals (•OH), which indicated that the presence of Fe-MCM-48 accelerated ozone decomposition . Moreover, the negatively charged surface of Fe-MCM-48 and the proper pH value of the DCF solution played an essential role in OH generation.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Tianwen Ma,Xiaojie Tan,Qingshan Zhao,Zhuangzhuang Wu,Fengliang Cao,Jingyan Liu,Xiaocui Wu,Hui Liu,Xiaobo Wang,Hui Ning,Mingbo Wu
In this study, we demonstrate noble metal-free Fe–N-codoped graphene nanoshells (Fe–N/GNS) derived from petroleum pitch as highly efficient and cost-effective catalysts for nitroaromatics reduction. By employing α-Fe2O3 nanoparticles simultaneously as both the hard template and the metal source, Fe–N/GNS can be facilely synthesized through the template-oriented method, followed by thermal annealing with urea for nitrogen doping. Owing to the high-dispersed synergetic Fe–N active sites as well as the hierarchical porous nanoshell structure, the Fe–N/GNS catalysts show remarkable catalytic performance and good tolerance for the reduction of nitroaromatics with NaBH4 aqueous solution. The optimized Fe–N/GNS-800 corresponds to pseudo-first-order kinetics for p-nitrophenol reduction at room temperature, with the rate constant (k) reaching 1.23 min–1. The reinforced structure also allows the catalyst to be readily recycled a dozen times without activity deterioration. This work may provide a new avenue to facilely fabricate cost-effective but powerful catalysts for nitroaromatics reduction and beyond.
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Water
·
2022
·Vol. 14
·期 19
·2946
·
IF 3.53
Chaomin Jia,Yijia Fan,Ruolan Jiang,Peidong Su,Shuai Liu,Xiaohui Zhang,Jianbing Wang
Excessive fluoride in mine water has become a major concern because it can cause detrimental effects to human health. Nevertheless, the removal efficiency of traditional adsorbents is far from satisfactory. Herein, La and Fe bimetallic supported zeolite was synthesized by co-precipitation method, for efficient defluoridation. The defluoridation performance of La-Fe zeolite was studied by a batch adsorption experiment and dynamic adsorption column test. Results indicated that the removal efficiency of F−was 99.04% under the optimal conditions (4 h, adsorbent dosage 8.0 g/L, agitation rate 200 rpm/min, temperature 298K and pH = 6 ± 1) that were determined through the batch adsorption experiments. CO32−and HCO3−can inhibit the defluorination effect of La-Fe zeolite. The adsorption of fluoride ions on La-Fe zeolite can be well described by the Langmuir adsorption model, and the maximum fluoride ion adsorption capacity is 2.64 mg/g. The test of dynamic adsorption column shows that the adsorption efficiency of F−by La-Fe zeolite on was higher than 85% for continuous adsorption of 9 h, indicating that La-Fe zeolite has good practical applications. The mechanism analysis indicated that the adsorption of fluoride ion by La-Fe modified zeolite involves both ion exchange and complexation, which belongs to the physicochemical process.
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