MOLECULES
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2023
·Vol. 29
·期 1
·144
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IF 4.6
Tao Tian,Jie Zhang,Lijiang Tian,Sijie Ge,Zhenyu Zhai
Visible-light-enhanced TiO2nanocatalysts doped with Cu and Fe were synthesized using the sol–gel method to investigate their performance in degrading gaseous benzene. The structure and morphology of mono- and co-doped TiO2(i.e., Cu/Fe-TiO2, Cu-Fe-TiO2) were characterized using SEM, EDS, XRD, BET, Raman, UV-vis-DRS, and XPS techniques. The results indicated that the presence of Cu/Fe mono- and co-doped TiO2leads to the formation of an anatase phase similar to pure TiO2. Furthermore, the introduction of Cu/Fe enhanced the presence of lattice defects and increased the specific surface area of TiO2. This enhancement can be attributed to the increase in oxygen vacancies, especially in the case of Cu-Fe-TiO2. Additionally, Cu-Fe-TiO2showed a higher concentration of surface-bound hydroxyl groups/chemically adsorbed oxygen and a narrower bandgap than pure TiO2. Consequently, Cu-Fe-TiO2exhibited the highest photocatalytic performance of 658.33 μgC6H6/(g·h), achieving a benzene degradation rate of 88.87%, surpassing that of pure TiO2(5.09%), Cu-TiO2(66.92%), and Fe-TiO2(59.99%). Reusability tests demonstrated that Cu-Fe-TiO2maintained a high benzene degradation efficiency of 71.4%, even after five experimental cycles, highlighting its exceptional stability and reusability. In summary, the addition of Cu/Fe to TiO2enhances its ability to degrade gaseous benzene by prolonging the catalyst’s lifespan and expanding its photoresponse range to include visible light.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Lixiao Yang,Mingye Zhu,Hongzhu He,Wenjuan Yang,Xiao Wei,Aixia Chen
Waste Shatian pomelo peel was converted into a cellulose aerogel precursor. • An Fe-based MOG/cellulose carbon aerogel was fabricated by in situ growth. • The aerogel enabled efficient oxytetracycline adsorption and magnetic recovery. • The biobased adsorbent showed good recyclability and regeneration stability. Biomass aerogels often face a trade-off between adsorption capacity and recoverability in antibiotic removal. To address this limitation, Shatian pomelo peel, an abundant agricultural byproduct from pomelo processing, was used as a cellulose precursor to fabricate a pomelo peel-derived porous cellulose material (PPCM). An Fe-based metal-organic gel (MOG) was introduced in situ as an Fe-containing precursor, followed by high-temperature carbonization to prepare an Fe-MOG-derived magnetic carbon aerogel (FMCA) containing Fe species, a well-developed porous structure, and magnetic responsiveness. After response surface optimization, the resulting FMCA achieved an adsorption capacity of 836.1 mg g −1 for oxytetracycline (OTC) at an initial concentration of 100 mg L −1 and exhibited a saturation magnetization of 50.28 emu g −1 , enabling rapid magnetic separation under an external magnetic field. After five adsorption-desorption cycles, the material retained approximately 70% of its initial adsorption capacity. The kinetic and isotherm data were best described by the pseudo-second-order and Langmuir models, respectively. Combined pore-structure, zeta-potential, FT-IR, XPS, and batch adsorption results indicated that OTC uptake involved pore filling and multiple interfacial interactions. These results demonstrate that coupling in situ Fe-based MOG incorporation with carbonization is an effective strategy for simultaneously improving adsorption efficiency and recoverability in pomelo peel-derived aerogels, offering a promising route for agricultural byproduct valorization and antibiotic-contaminated water treatment. Download: Download high-res image (293KB) Download: Download full-size image
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Dedi Liu,Dapeng Dong,Zhenyi Zhang,Yangyang He,Zhenghua Li,Jinhai Niu,Naisen Yu,Hongsheng Jia
Encapsulating organic dyes within porous solids is an efficient way to design luminescent composite materials and devices. However, for practice applications, the luminescence tuning and the stability investigation of such materials is still a challenge work. Here, a comparative in situ Raman spectra and photoluminescence (PL) spectra are employed to study the structural and optical property of both pure Rhodamine B (RHB) and samples absorbed on a kind of typical materials of institute lavoisier frameworks (MIL) under high pressure, respectively. The luminescence of RHB@MIL 53(Fe) can persist to pressures much higher than that for pure RHB. Our studies revealed that the PL emissions of RHB origin from monomeric and dimeric structures, respectively. Furthermore, our results indicated that the confining effect of MIL 53(Fe) pores inhibited the dimerization of RHB molecules under high pressure.
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Catalysts
·
2023
·Vol. 13
·期 12
·1474
·
IF 3.9
Yuhang Cai,Anping Yin,Jianxiang Zhang,Jiatai Wang,Xiaofei Qin,Yibo Yang,Gaolei Qin,Xiaodong Sun,Peng He,Yong Yang
This study focuses on the synthesis and evaluation of carbon−coated Ni−Fe alloy catalysts (NiFex@C, x = 0, 0.3, 0.7, 1.1) for the hydrogenation of cinnamaldehyde. The catalysts were characterized using Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), Raman spectroscopy, and X-ray Photoelectron Spectroscopy (XPS). The introduction of Fe was found to increase the average particle size of the bimetallic catalysts compared to the monometallic Ni@C. Ni existed in both metallic and oxide states, while Fe exhibited multiple oxidation states in the bimetallic catalysts. The carbon layer, approximately 2–3 nm thick, was confirmed to envelop the alloy particles. The catalytic performance of carbon−coated Ni−Fe alloy catalysts indicated that the addition of Fe to Ni@C enhanced the selectivity towards hydrocinnamaldehyde (HCAL), with NiFe0.7@C showing the highest selectivity (~88.6%) but at a reduced conversion rate. The carbon layer played a pivotal role in the stability and reusability of the catalysts. NiFe0.7@C maintained consistent performance over multiple reaction cycles, while NiFe0.7NPs (without a carbon layer) exhibited significant deactivation. Both catalysts displayed strong magnetism, facilitating easy separation from the reaction mixture. This study sheds light on the significance of the carbon layer in bimetallic catalysts and provides valuable insights for designing efficient catalysts for hydrogenation processes.Keywords:cinnamaldehyde hydrogenation;bimetallic catalysts;carbon−coated nanoparticles;Ni−Fe alloy;catalyst reusability
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Wei Zhou,Yutong Ren,Zhipeng Sun,Ling He,Ling Pan,Peng Xiao,Yang Li
High-temperature molten silicate deposit corrosion has become a critical factor for the failure of thermal barrier coatings. In this work, promising ytterbium hafnate ceramics with different HfO 2 content were prepared by solid-phase reaction, and the effect of HfO 2 content on Fe-containing silicate corrosion behavior of ytterbium hafnate ceramics was investigated. The evolution of HfO 2 content showed negligible influences on reaction products and corrosion mechanism. The attack of Fe-containing silicate melts on the ceramic led to the formation of a reaction layer consisting of apatite, fluorite, and garnet. This layer plays a critical role in preventing further penetration of the melts. However, ytterbium hafnate ceramics with lower HfO 2 content showed better resistance to melt attack.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Hongyun Xue,Gansheng Shi,Guanhong Lu,Xinhong Xu,Xiaomeng Ren,Yan Wang,Xiao Wang,Xiaofeng Xie,Jing Sun
Constructing heterojunction structures is considered one of the effective methods to improve the activity of photocatalysts. A novel Z-Scheme heterojunction Fe-BDC/TiO 2 was designed and synthesized by amorphous gel Fe-BDC and TiO 2 nanoparticles with electrostatic self-assembly method. The introduction of Fe-BDC has been proved to expand the light absorption range and promote the separation and transfer of interface photo generated electrons and holes. Thus, the photocatalytic degradation efficiency of acetaldehyde by 5% Fe-BDC/TiO 2 sample is 2.3 times than that of pure TiO 2 sample. And the reaction rate is 2.5 times than that of pure TiO 2 sample. The free radical capture experiment shows that O 2 − played a more important role in the degradation of acetaldehyde. In addition, in situ infrared analysis further reveals the surface species of the photocatalysts during adsorption and degradation processes. The acetaldehyde degradation route of Fe-BDC/TiO 2 has been speculated. ‘1These findings provide valuable references for the design of metal oxide semiconductor/Fe based MOF heterojunctions and the efficient degradation of aldehyde VOCs.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Jing Li,Junjie Yang,Hui Ren,Xinhui Wang,Yuecheng Xu,Yong Guo,Dan Xiao
In this study, we present an electrochemical sensor with superior sensitivity and selectivity for dopamine (DA) detection. The sensor was created using a nanocomposite of iron-iron carbide nanoparticles decorated with carbon nanotubes (Fe-Fe 3 C@CNTs) to modify a glassy carbon electrode (GCE). The Fe-Fe 3 C@CNTs nanocomposite can be synthesized by a facile microwave-assisted synthesis method with just adopting ferrocene and carbon fiber as raw material and heat source, respectively. The electron microscopy (EM) results indicate that the Fe-Fe 3 C nanoparticles encapsulated with graphitic layer were decorated with CNTs. An investigation of the electrochemical responses of the Fe-Fe 3 C@CNTs/GCE sensor to DA was performed using both cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Notably, in ideal experimental settings, the sensor demonstrated a minimal limit of detection (LOD) of 0.01 μM within a range of linearity from 0.05 to 40 μM, even under a high concentration of uric acid (UA) interference. Moreover, the utility of the produced Fe-Fe 3 C@CNTs/GCE sensor was further validated through successful DA testing in urine samples of human.
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ANALYTICAL SCIENCES
·
2021
·Vol. 37
·期 2
·293-299
·
IF 2.081
Liu ZHANG,Yue HOU,Xiaoyan GUO,Wei LIU,Congcong LV,Xing PENG,Zixuan ZHANG
In this work, a new chemiluminescence (CL) system of Co-Fe prussian blue analogs nanocubes (Co-Fe PBA NCs) that can catalyze luminol to produce strong CL in the absence of H2O2 was established. Co-Fe PBA NCs have the property of oxidase-like activity, and it can catalyze the generation of active oxygen radicals in a dissolved oxygen system. Since caffeic acid (CA) can remove reactive oxygen species in the system, a sensitive detection method for CA on a paper-based chip was developed. Under the optimal conditions, this method showed a good linear response to CA in the range of 10 – 800 ng mL−1 with a limit of 3 ng mL−1. The proposed method had been used for the determination of CA in tea samples. The results may open a new avenue for the catalytic property on luminol CL system without extra oxidants.
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2021
·Vol. 46
·期 5
·690-696
·
IF 1.887
Naimeng Song,Li Yang,Pingan Liu
This paper mainly introduces the Ph−Fe/RDX(HMX) composite microspheres prepared by ultrasonic spray drying. Their morphology was observed by SEM and found that the composite microspheres were spherical. Also, the composite microspheres exhibited good dispersion. The results of the granularity data show that the D 50 data of Ph−Fe/RDX and Ph−Fe/HMX were 580.78 nm and 496.52 nm, respectively. The DSC data showed that the catalytic effect of the composite microspheres was significantly better than that of the mixed powder. The DSC data showed that the decomposition peak temperature of the Ph−Fe/RDX(HMX) composite microsphere was 229.6 °C (279.6) lower than the 235.6 °C (284.3) of the mixed powder. The DSC data demonstrated that the catalytic performance of the composite microspheres was significantly better than that of the mixed powder. Therefore, the ultrasonic spray drying method has great potential for preparing energetic composite microspheres.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 5
·1-8
·
IF 5.833
Sun Ying,Lin Tianran,Zeng Cuihong,Jiang Gaoyan,Zhang Xuanhan,Ye Fanggui,Zhao Shulin
A self-correcting fluorescent assay of tyrosinase (TYR) was developed by utilization of Fe-MIL-88B-NH 2 as a peroxidase-like nanozyme and a capture probe. Fe-MIL-88B-NH 2 nanozyme was selected as an electron donor, and the oxidization product (dopamine- o -quinone) acts as an energy acceptor. First, TYR catalyzes the oxidation of tyramine hydrochloride to dopamine and then to dopamine- o -quinone. Second, Fe-MIL-88B-NH 2 with intrinsic peroxidase-like activity decomposes H 2 O 2 to produce ·OH radicals, which further accelerate the oxidation of dopamine to dopamine- o -quinone. Excessive H 2 O 2 and ·OH radicals reduce the interferences from ascorbic acid at the same time providing a self-correcting ability. Dopamine- o -quinone reacts with -NH 2 groups on the ligand of Fe-MIL-88B-NH 2 through Michael reaction which results in fluorescence quenching. Under 365-nm excitation, the fluorescence emission intensity at 452 nm gradually decreased with increasing TYR concentration varying from 0 to 10 U mL −1 . The linear range is from 1 to 5 U mL −1 and the detection limit is 0.05679 U mL −1 . This self-correcting fluorescent assay of tyrosinase exhibits good sensitivity and selectivity which is also successfully applied for tyrosinase inhibitor detection. Graphical abstract
Schematic representation of fluorescent assay for tyrosinase determination based on Fe-MIL-88B-NH 2 nanozyme. A self-correcting fluorescent assay for tyrosinase was developed based on the Fe-MIL-88B-NH 2 nanozyme.
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Journal of Energy Chemistry
·
2021
·
IF 9.676
Jian Zhang,Qing Yin,Yunjia Wu,Shuoxiao Zhang,Kai-Jie Wang,Jingbin Han
A kind of layered Li 2 MSiO 4 material, Fe saponite with Na + pillaring (Na + -FSAP) was developed as a low-cost and environment-friendly lithium-ion storage material. The Na + -FSAP follows the insertion/deinsertion working mechanism accompanied by valence change of Fe from Fe 1.86+ to Fe 2.71+ (average value) after stabilization, and displays a specific capacity of 125 mAh g −1 at 50 mA g −1 with retention ratio of 80.8% after 75 cycles. The Na + -pillaring effect and abundant structural water in the gallery urge Li + migrate rapidly, resulting in a large Li + diffusion coefficient within a range of 10 −6.5 –10 −7.5 cm 2 s −1 . Thus, the Na + -FSAP provides a model material to design electrode materials with rapid lithium-ion migration and has great potential to take place of polyanionic-type Li 2 MSiO 4 (M = Mn, Fe, Co) cathode materials.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiahao Wei,Dandan Han,Jingtao Bi,Junbo Gong
Heterogeneous Fenton-like catalytic oxidation is a promising method for organic pollutants removal. However, the catalytic activity is restricted by the redox cycles of active sites. In this study, Fe was doped into ilmenite cobalt titanate to prepare Fe-doped CoTiO 3 catalysts for antibiotic tetracycline (TC) degradation. Experiments and theoretical calculations illustrated that doping Fe in CoTiO 3 increased the electron density of Co atoms of active sites, enhancing the redox cycles during peroxymonosulfate (PMS) activation, and facilitating the generation of radicals for degrading pollutants. After doping Fe, over 99% of TC (20 mg/L) can be degraded in 40 min, and the reaction rate increased 5 folds compared with the pristine CoTiO 3 . The inherent crystal stability of ilmenite guarantees the reusability of catalysts and limited cobalt ions leaching (≤0.22 mg/L). Besides, the impacts of PMS concentration, catalyst dosage, initial pH, coexisting ions, and reaction temperature on TC removal were systematically investigated, and the possible degradation pathway was proposed. Quenching experiments and electron paramagnetic resonance (EPR) spectra indicated that sulfate radicals and singlet oxygen participated in TC degradation. This work provides new clues and strategies to construct highly efficient catalysts for heterogeneous catalytic oxidation.
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