SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Xiaohui Fan,Jinjin Zhao,Cheng Cheng,Yin Xu,Hui Zhang
Efficient and low-cost catalysts are important for contaminant remediation in peroxymonosulfate (PMS)-based advanced oxidation processes (AOPs). In this study, a solid waste, generated by the polyferric chloride coagulation of the phenol-saturated powder activated carbon from an industrial wastewater treatment plant, was used to prepare metal/carbon composites under different pyrolysis temperatures (650–950 °C). The catalyst pyrolyzed at 950 °C (FeAC-950) exhibited the highest reactive activity for PMS activation as demonstrated by a series of electrochemical techniques. Nearly complete BPA elimination can be achieved within 60 min by 0.1 g L –1 FeAC-950 and 0.5 mM PMS. The results of electron paramagnetic resonance (EPR), chemical quenching and open circuit potential (OCPT) experiments demonstrate a combined radical and non-radical oxidation mechanism in the FeAC-950/PMS process and BPA was removed dominantly through radical pathway. Various persistent organic pollutants can be efficiently eliminated in the FeAC-950/PMS system. In addition, the present system showed good tolerance to natural organic matter as well as some common anions such as chloride and nitrate. This study dedicated a simple method to prepare an efficient solid waste-based catalyst in environmental catalysis. The outcomes will not only provide a value-added reuse approach for waste management but also facilitate the FeAC-950 applications in wastewater remediation technologies.
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高影响因子
MOLECULES
·
2023
·Vol. 29
·期 1
·144
·
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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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Shuhuai Li,Yan Deng,Chaohai Pang,Xionghui Ma,Yuwei Wu,Mingyue Wang,Jianping Li,Zhi Xu,Lianming Zhang
The performance of an electrochemiluminescent reagent directly affects the performance of its corresponding electrochemiluminescent (ECL) sensor. In this study, Fe/Zn-benzene-1,3,5-tricarboxylic acid metal–organic framework@C-dots (Fe/Zn-BTC@C-dots), which consist of a nano-loaded carbon quantum dot material with an excellent luminescence performance, were synthesised for the first time. Subsequently, they were used to modify the surface of a glassy carbon electrode, and combined with a single-chain thiamethoxam DNA aptamer to construct a biosensor. A novel method for the detection of thiamethoxam was established based on control of the excellent luminescence signal of the Fe/Zn-BTC@C-dots by specific recognition of the aptamer by the target molecule (a signal switch). Upon capturing thiamethoxam, the electrochemical luminescence intensity of the sensor was quenched. The ability of Fe/Zn-BTC to effectively catalyse and amplify the electrochemical luminescence of the C-dots significantly improved the sensitivity of the sensor, while the specific recognition of the target by the aptamer imparted the sensor with an excellent selection ability. Such an advanced approach is promising for the detection of thiamethoxam, with a linear range of 5–5000 × 10 −11 mol/L and a sensitivity of 9.81 × 10 −12 mol/L being achieved. Moreover, the sensor exhibited recovery rates of 90.5–109.3% upon the detection of thiamethoxam in actual samples.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Ping-an Yang,Rui Cai,Haibo Ruan,Mingqi Zhao,Xin Huang,Nanqing Zhang,Rui Li,Yuxin Zhang,Jiufei Luo
One-dimensional iron–nickel (Fe–Ni) heterogeneous nanowires with superior electromagnetic wave (EMW) absorption were successfully prepared by a magnetic-field-assisted liquid-phase reduction method. The electromagnetic properties of the absorber were controllably tuned by changing the atomic molar ratio of Fe to Ni. The composite with an Fe:Ni atomic molar ratio of 1:1.5 exhibited the finest EMW absorption characteristics. With a matched thickness of 2.175 mm, the minimum reflection loss (RLmin) at 18 GHz can be as high as 26.106 dB. Also, the majority of the Ku-band is covered by the effective absorption bandwidth (EAB, RL ≤ −10 dB), which is up to 6.08 GHz at 2.6 mm with a filler content of 25%. The excellent absorber performance is due to one’s own rich heterogeneous interface to conciliate the dielectric and magnetic losses. The successful exploration of the one-dimensional heterogeneous structure EMW absorber provides important insights for the future sensible fabrication of absorbers with excellent EMW absorption capability.
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IONICS
·
2023
·Vol. 29
·期 11
·4825-4833
·
IF 2.8
Yu Dan,Dong Seng,Liu Qian,Jia Weiyi,Gao Faming,Wang Yatao
The preparation of platinum-free electrocatalysts with ideal oxygen reduction reaction (ORR) activity is of great significance for cost-effective fuel cells. Herein, we synthesize a series of Pd-based (PdFe, PdCo, PdNi, and Pd) nanowires (PdM NWs). Their diameters are about 10 nm. And the lengths are up to even micrometers. The mass activity of the series of Pd-based catalysts followed the descending order: PdNi NWs/C > commercial Pt/C > PdCo NWs/C > PdFe NWs/C > pure Pd NWs/C. The optimal half-wave (E 1/2 ) of PdNi NWs/C (839 mV) is positive shift 138 and 25 mV compared with pure Pd NWs/C (701 mV) and commercial Pt/C (814 mV), respectively. The mass activity (MA) of PdNi NWs/C only dropped 28% after 10,000 potential cycles between 0.6 and 1.1 V versus RHE in acid medium. This work provides a promising and reliable strategy to synthesize high performance Pd-based electrocatalyst, which is promising alternative to expensive Pt-based electrocatalysts for fuel cells. Graphical Abstract TOC: We prepared bimetallic PdNi nanowires, which ORR mass activity higher than pure Pd nanowires and commercial Pt/C in acidic medium.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaoxue Pan,Fengtao Sun,Min Wang,Hong Sun,Rui Zhang,Mingbao Feng,Xuesheng Zhang
Synthetic phenolic antioxidants (SPAs) have been commonly used in industrial and domestic products to prevent the adverse effects of oxidants such as oxygen. However, attention to the removal of SPAs is scarcely attracted. In this paper, the removal kinetics, influencing factors, transformation mechanisms and toxicity in Fe(VI) oxidation of 18 SPA congeners were investigated in detail. Results showed that propyl gallate (PG), butylated hydroxyanisole (BHA), and tert -butylhydroquinone (TBHQ) had the highest reactivities with Fe(VI), while the reaction rate constant ( k app ) value of 2,4-di- tert -butylphenyl 3,5-di- tert -butyl-4-hydroxybenzoate (UV120) was the lowest (221.3 M −1 s −1 ). A robust quantitative structure–activity relationship (QSAR) model between k app and molecular structural descriptors of SPAs was established. The energy gap between the lowest unoccupied molecular orbital ( E LUMO ) and the highest occupied molecular orbital ( E HOMO ) was a vital parameter to determine the removal efficiencies of the SPA congeners. Furthermore, the numbers of oxygen atoms and alkyl groups in SPA structures also determined their reactivities with Fe(VI) to some extent. In addition, aqueous 2,6-di- tert -butyl-4-methylphenol (BHT, a representative of SPAs) could be efficiently removed with the increased amount of oxidant, and decreased substrate concentration and slightly alkaline conditions. Seventeen intermediates were identified, and oxidation routes including H-abstraction, single- and double-oxygen(s) transfer, and coupling were deduced. However, H-abstraction inevitably led to the generation of BHT-Q with higher toxicity than parent. These findings provide novel insights into the production and removal of SPA analogs.
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International Journal of Green Energy
·
2023
·
IF 3.3
Lanlan Feng,Guofa Mi,Zhenluo Yuan,Zeping Liu,Baozhong Liu,Guangxin Fan
Co3O4 has been considered a promising anode material because of its high theoretical capacity (890 mAh/g) and remarkable energy density. Unfortunately, it suffers from low initial coulombic efficiency, rapid capacity fading, poor electronic conductivity, large volume changes, and aggregation during the lithium ion intercalation/deintercalation process. In this work, a series of Fe2+-doped Co3O4 nanostructured materials Co3(1-x)Fe3xO4 (x = 0, 0.01, 0.02 and 0.03) were produced by a simple chemical co-precipitation method. The Fe doping led to a slight increase of the lattice parameter, which is beneficial to the rapid diffusion of Li+ ion during the lithiation/delithiation process. Meanwhile, the Fe-doped Co3O4 sample exhibited an excellent rate capability of 886.47 mAh/g at 500 mA/g, and outstanding cyclic stability (1156.91 mAh/g for 50 cycles, with the capacity retention rate of 83.53% at the current density of 100 mA/g), demonstrating improved electrochemical performance, compared with that of pure Co3O4. The good electrochemical performance profited from the formation of oxygen vacancies by Fe doping, which provided more space for Li+ diffusion and improved the electronic conductivity of the anode material. This work provides a simple way to improve the comprehensive electrochemical performance of the transitional metal oxide Co3O4 anode electrodes for lithium-ion batteries.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Xuyang Zou,Jiangzhang Wang,Guojun Lv,Tao Wang,Chaoyi Zhou,Yan Chen,Jialing Shen,Shihao Su,Zhongmin Liu
Impregnation handlement can load highly dispersed CuO nanoparticles on the Fe-MFI zeolite and effectively enhances its catalytic activity in the tetracycline degradation reactions, but encounters serious re-usability problems. In this work, Fe-MFI zeolite-encapsulated copper oxide CuO@Fe-MFI was prepared via one-step hydrothermal synthesis and utilized as heterogeneous catalyst for the removal of tetracycline. The obtained 2CuO@1Fe-MFI zeolite presented a external surface area of 270 m 2 /g, which was almost 5.5 folds of 2CuO/1Fe-MFI zeolite obtained by impregnation handlement. In addition, there may be a near-neighbor effect between encapsulated CuO and framework iron evidenced by the shifts of UV–Vis absorption bands as well as binding energies for Fe 2p and Cu 2p. At pH = 7.0, 2CuO@1Fe-MFI zeolite attained the largest tetracycline removal rate of 99.6% within 20 min at experimental conditions: [TCE] = 50 mg/L, [Catalyst] = 0.5 g/L, [PMS] = 1.0 g/L, 323 K, and the biggest degradation rate constant of 2.42 min −1 , which was almost 11.1 folds of that for 2CuO/1Fe-MFI zeolite. The large external surface area and near-neighbor effect together gave rise to the excellent tetracycline degradation performance for 2CuO@1Fe-MFI zeolite. On the same time, the obtained 2CuO@1Fe-MFI zeolite can be reused for more than five times. Quenching experiments and EPR characterizations demonstrated the reactive species for tetracycline removal over 2CuO@1Fe-MFI zeolite were •OH, SO 4 • − , •O 2 − and 1 O 2 species, and moreover 1 O 2 served as the major active species. Furthermore, possible tetracycline degradation pathways over 2CuO@1Fe-MFI zeolite were proposed.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yihao Li,Hongmei Tang,Xiangqin Peng,Shiyang Tao,Jie Ding,Meiqing Chen,Pingxiao Wu,Nengwu Zhu
The dynamic interactions among iron (Fe) oxides and organic matter (OM) play vital roles in controlling the geochemical cycling of carbon (C) and toxic trace metals. Although the effects of OM on the Fe oxides transformation, and dynamic with toxic trace metals have been studied previously, it is still poor to understand the mechanistic and quantitative on the C sequestration during the Fe(III) mineralization process, and kinetics with hydrated Cu(II) in the acid drainage. In this study, Mössbauer spectroscopy, X-ray absorption spectroscopy (XAS), high resolution transmission electron microscopy (HRTEM), and density functional theory (DFT) were used to elucidate the underlying mechanism for the fine structure of iron minerals, fulvic acid (FA) sequestration and hydrated Cu(II) coordination on Fe oxides. FA dosages played an essential role in the formation of Fe oxides, which can inhibit the formation of Fe-O octahedrons and benefit to the Fe-O tetrahedron. FA molecules were mainly sequestrated on the surfaces of Fe oxides and van der Waals forces were the main interaction between FA and Fe oxides. The hydrated Cu(II) oxides mainly distributed on the surface of iron oxides as divalent oxidation states, and feasible coordinated with phenolic hydroxyl group of FA and Fe oxides. The knowledge of the dynamic coupling between Fe oxide transformation under the effect of FA and the fate of hydrated Cu(II) on Fe oxides provided the basis for predicting the geochemical process of Fe, C and toxic trace metals.
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Frontiers in Bioengineering and Biotechnology
·
2023
·
IF 5.7
Fang-Lan Geng,Hai-Yuan Chi,Hua-Chao Zhao,Jin-Quan Wan,Jian Sun
Fe-based metal-organic frameworks (MOFs) show high activity toward the activation of peroxodisulfate (PDS) for the removal of organic micropollutants (OMPs) in wastewater treatment. However, there is a phenomenon of Fe ion dissolution in the Fe-based MOFs’ active PDS system, and the reasons and influencing factors that cause Fe ion dissolution are poorly understood. In this study, we synthesized four types of Fe-based MOFs and confirmed their crystal structure through characterization. All types of Fe-based MOFs were found to activate PDS and form sulfate radicals (SO 4 − ), which effectively remove OMPs in wastewater. During the process of Fe-based MOFs activating PDS for CIP removal, activated species, oxidant reagent, and pH negatively impact the stability performance of the MOFs’ structure. The coordination bond between Fe atom and O atom can be attacked by water molecules, free radicals, and H + , causing damage to the crystal structure of MOFs. Additionally, Fe (II)-MOFs exhibit the best stability performance, due to the enhanced bond energy of the coordination bond in MOFs by the F ligands. This study summarizes the influencing factors of Fe-based MOFs’ damage during PDS activation processes, providing new insights for the future development of Fe-based MOFs.
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高影响因子
Materials
·
2023
·Vol. 16
·期 17
·5785
·
IF 3.4
Weiran Zhang,Ziyu Li,Guohua Wu,Wei Wu,Hailan Zeng,Haiyun Jiang,Weili Zhang,Ruomei Wu,Qiong Xue
The utilization of Co-Cr-Fe-based black pigments bears considerable significance within the realm of commercial ceramic pigments, owing to their distinctive spinel structure, remarkable high-temperature stability, and exceptional chromatic attributes. This study delves into the synthesis of diverse black pigment configurations by employing the co-precipitation method, leveraging the interplay of these three metallic oxides. This investigation encompasses a comprehensive scrutiny of ion valences, crystal structures and parameters, colorimetric properties, and their interrelationships. The methodology integrates the response surface methodology (RSM) framework, using theoretical formulations to navigate the material ratios and elucidating the associations between the resultant compositions and color coordinate values, aligned with the CIE-Lab* colorimetric methodology. The derived predictive models yielded an optimized black pigment composition, characterized by heightened black intensity and a refined formulation.Keywords:black ceramic pigment;response surface methodology;co-precipitation method;chromatic properties;spinel
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 7
·4951-4958
·
IF 2.1
Mu Guili,Zhou Jinglin,Ye Beirong,Zhang Tengfei,Li Chen,Zhao Qiang
The development of efficient, long-lasting, low-cost, and environment friendly electrocatalysts for oxygen evolution reactions (OER) is imminent in many energy storage and conversion devices. Here, a unique electrocatalyst of Fe-doped Co 3 O 4 particles loaded on carbon nanotubes (Fe-doped Co 3 O 4 /CNT/NF) was synthesized by a one-step flame method. This method significantly reduces the reaction time (the whole flame process just maintain ~ 10 s). The doping of iron significantly enhances the activity of the OER, as demonstrated by a reduced overpotential of 232 mV to achieve 10 mA cm −2 , a tiny Tafel slope (34.1 mV dec −1 ), and long-lasting durability in an alkaline electrolyte. This work provides a potential possibility for large-scale industrial production. Graphical Abstract The carbon nanotubes attached with Fe-doped and Co 3 O 4 nanoparticles were generated in situ by a simple and reliable one-step flame method. Fe-doped and Co 3 O 4 nanoparticles were immobilized on the surface of the carbon nanotubes, resulting in Co being able to expose more active edges. As a result, the newly designed Fe-doped Co 3 O 4 /CNT/NF exhibits lower overpotential and Tafel slope. The low cost of the basic materials in this design and the easy and fast preparation method ensure that it can be produced on a large scale.
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