DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 33
·11604-11609
·
IF 4.39
Guojuan Hai,Jianfeng Huang,Liyun Cao,Koji Kajiyoshi,Long Wang,Liangliang Feng,Yijun Liu,Limin Pan
Designing cost-effective bifunctional catalysts with high-performance and durability is of great significance for renewable energy systems. Herein, typical Fe, Ni-codoped W18O49/NF was prepared via a simple solvothermal method. The incorporation of Fe ions enhanced the electronic interaction and enlarged the electrochemically active surface area. The increased W4+ leads to a high proportion of unsaturated WO bonds, thus enhancing the adsorption capacity of water. The valence configuration of nickel (Ni) sites in such dual-cation doping is well adjusted, realizing a high proportion of trivalent Ni ions (Ni3+). Due to the orbital interactions, the Fe3+/Ni3+ ions and OER reaction intermediates exhibit strong orbital overlap. The positions of the valence band and conduction band are well modulated. As a result, the Fe, Ni-codoped W18O49/NF shows improved electrocatalytic activity, and achieves a low decomposition voltage of 1.58 V at 10 mA cm−2 and retains long-time stability.
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CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Hao Wang,Xiaohao Liu,Guangyue Xu,Ziwei Guo,Ying Zhang
ABSTRACT Owing to Fe being the most abundant and least expensive transition metal on the earth, the utilization of Fe-based catalysts for catalytic hydrogenation has attracted worldwide attention. In this work, a series of N-doped C supported Fe catalysts (Fe-N-C) were prepared by co-pyrolysis of cellulose and ferric chloride under ammonia atmosphere. Characterization methods such as elemental analysis, atomic absorption spectroscopy, nitrogen adsorption-desorption isotherms, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were carried out to explore the physicochemical properties of the catalysts. Using hydrogenation of nitrobenzene as a model reaction, the catalysts prepared at different pyrolysis temperatures displayed different activities. Fe-N-C-700 exhibited the best activity among these catalysts, with the yield of aniline being up to 98.0% under 5 MPa H 2 at 120 °C after 12 h. Combined with the results of catalyst characterization and comparative tests, the transformation of Fe species and the generation of N-doped C, especially graphitized N-doped C, in the catalyst may be the main factors affecting the activity. A kinetic study was carried out and the apparent activation energy was obtained as 31.53 kJ/mol. The stability of the catalyst was also tested and no significant decrease in the activity was observed after 5 runs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Linbo Luo,Sheying Dong,Hao Cui,Longhui Sun,Tinglin Huang
The ecosystems and human health were seriously threatened by hexavalent chromium (Cr(VI)) in wastewater. In this article, using the idea of the highly matched energy band structure between indium sulfide (In 2 S 3 ) and MIL-53(Fe), a Type-II heterojunction has been constructed by loading In 2 S 3 on MIL-53(Fe) microrod to overcome the fault like high recombination rates of photogenerated electron-holes of In 2 S 3 . The composite with 20:1 mass ratio of In 2 S 3 to MIL-53(Fe) (IM-2) was adopted as an optimal sample for efficient photocatalytic Cr(VI) reduction under visible light . Various characterization techniques were used to verify the characteristics of composites and delved into the structure-effect relationship between this heterojunction and its activity. Results showed that the reaction rate constants of the photoreduction process over IM-2 was ~ 4 and 26 times higher than those of pure In 2 S 3 and MIL-53(Fe), respectively, and the catalyst could maintain superior removal efficiency (88.6%) and steady crystal structure after four cycles. First-principles calculations further illustrated that the heterostructure formed between In 2 S 3 and MIL-53(Fe) could effectively accelerate the separation of photogenerated electrons and holes, thus improving the photocatalytic reduction performance. Moreover, the active species analyses revealed that the superoxide radicals and electrons were mainly involved in the reduction of Cr(VI).
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yuwei Xue,Lihua Liu,Ting Zhang,Ziqi Zhu,Mingjun Xu,Qian Zhang,Junming Hong
There has been growing attention in the combination of metal oxide nanoparticles with metal-organic frameworks (MOFs) for the synergistically intensified catalytic activity . Herein, functional Fe-MOF@Mn 2 O 3 composites were synthesized to activate peroxymonosulfate (PMS) for 4-Cholophenol (4-CP) degradation via a hydrothermal and calcination method. Under the reaction parameters of 2 mM PMS, 0.2 g/L catalyst dosage, and pH 7.0, 91.4% of 4-CP (10 mg/L) could effectively be degraded within 60 min (2.2-fold increase in reaction rate constant compared with pure Mn 2 O 3 ). The excellent degradation performance of Fe-MOF@Mn 2 O 3 /PMS system was attributed to the surface hydroxyl and synergistic effect between iron and manganese. Quenching reaction and EPR analysis revealed both sulfate (•SO 4 - ) and hydroxyl radicals (•OH) were responsible for 4-CP degradation. The Fe-MOF@Mn 2 O 3 composite exhibited intensive catalytic capability as well as electron transfer efficiency according to the electrochemical measurements. Meanwhile, the possible degradation pathways were proposed by analyzing intermediates via LC-MS detection. The results indicates that the Fe-MOF@Mn 2 O 3 /PMS system is effective and adaptable for the treatment of 4-CP in different water conditions.
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Environmental Science-Advances
·
2023
·Vol. 2
·期 5
·731-739
·
IF 0
Wen Wen,Yina Liu,Zhongping Li,Guangming Wen,Hung-Wing Li,Li Li
In this study, we report a simple pyrolytic strategy for N–C co-doped Fe-based nanoparticles (Fe–N–C) and exhibit their oxidase-mimicking and peroxidase-mimicking activity in a chromogenic reaction with 3,3′,5,5′-tetramethylbenzidine dihydrochloride (TMB) as a substrate. Structural analysis revealed that Fe–NX and Fe3C structures were formed with Fe-Imace coordination compounds as precursors and melamine as the nitrogen source, which provided abundant active sites for the Fe–N–C nanozyme. Interestingly, owing to the blocking effect triggered by π–π stacking between the tetracycline antibiotics (TCs) tetraphenyl skeleton and Fe–N–C, the substrate affinity of the Fe–N–C was significantly blocked, resulting in the solution fading. Under the optimum conditions, the UV absorption intensity versus the concentration of TCs was found to be linear over the range of 0.08–90 μM for tetracycline (TC), 0.1–80 μM for chlortetracycline (CTC) and 0.09–100 μM for oxytetracycline (OTC). The detection limits were 62 nM for TC, 85 nM for CTC and 88 nM for OTC. The Fe–N–C displayed good storage and long-term stability when stored at 4 °C for 30 days. In addition, based on its superparamagnetism, Fe–N–C can be effectively recycled and reused through an external magnetic field, avoiding secondary pollution.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Xiang Li,Lunzhou Yu,Zhen Xiang,Erbiao Cui,Juan Xiong,Xiao Wang,Wei Lu
Core-shell structure is an effective approach to modulate the impedance matching behaviour and induce polarization relaxation at the interface for the high-performance electromagnetic wave absorption (EMWA) materials. Herein, core-shell structures of Fe 3 O 4 –Fe@C (FFC) were successfully developed by hydrothermal and thermal decomposition methods. The results showed that the phase composition, microstructure and EMWA performance were tailored by the heat treatment process. The optimized FFC hybrid exhibited a minimum reflection loss ( RL ) value of −56.3 dB with a matching thickness of 1.99 mm, and the effective bandwidth ( RL < −10 dB, 5 GHz) covers almost the whole Ku band. The enhanced EMWA properties of the reinforced olive-like composites were mainly ascribed to the magnetic loss derived from the enhanced magnetic anisotropy, and the dielectric loss originated from the multilevel interface and polarization characteristics between the core and the shell. Therefore, this work provides an approach to design core-shell nanocomposites with enhanced EMWA performance.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Bang Xiao,Anqi Jiao,Yiran Zhang,Lin Yang,Xuteng Zhao,Chunping Wu,Dongdong Guo,Reggie Zhan,He Lin
NH 3 detection is of great significance for precise control of the SCR system. In this paper, mixed potential type ammonia sensor using LaCo 1-x Fe x O 3 sensing electrode, YSZ electrolyte, and Pt reference electrode was developed. LaCo 1-x Fe x O 3 sensing materials were made by flame spray pyrolysis technique, and Fe B-site substitution was implemented to enhance the sensing performance. It was observed that in the concentration range of 20–70 ppm at 475 °C, the sensor using LaCo 0.9 Fe 0.1 O 3 as sensing electrode exhibited the highest sensing signal and sensitivity to ammonia among the LaCo 1-x Fe x O 3 -SE sensors (x = 0, 0.05, 0.1, 0.2, 0.3). A sectional linear relationship between the response value change( Δ V ) of that sensor and the logarithm of ammonia concentration within the range of 2–15 ppm and 15–70 ppm was noticed, and the sensitivities were 17.52 and 87.22 mV/decade, respectively. Its lower detection limit reached 2 ppm at 475 °C. Its excellent sensing properties are ascribed to enriched oxygen vacancies and high electrocatalytic performance of the perovskite electrode. Moreover, the sensor exhibited good selectivity against CH 4 , CO, NO, NO 2 , and good stability against oxygen and water vapor concentration fluctuation. Besides, the sensing response to 50 ppm ammonia has been tested for 22 days and only a slight fluctuation within 7 % was observed. Furthermore, the mixed potential sensing mechanism of the sensor was discussed.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Fuad Abduro Bushira,Shimeles Addisu Kitte,Haijuan Li,Lirong Zheng,Ping Wang,Yongdong Jin
Simultaneous highly sensitive and accurate detection of dopamine (DA) and uric acid (UA) is of great importance since they are important biomolecules that are commonly coexisted in the human body and play a crucial role in numerous physiological and pathological features. In this work, Fe-N 5 single atom catalyst (SAC) supported on graphene was firstly employed for simultaneous electrochemical detection DA and UA. Owing to its unique electronic structure and abundant active sites, under optimal conditions, the enzyme-like Fe-N 5 SAC constructed electrochemical (bio)sensor exhibits excellent linear characteristic responses in the range of 0.005–500 and 0.01–480 µM, as well as the low limit of detection of 0.007 and 0.027 nM for DA and UA, respectively. More critically, the developed electrochemical system shows promising merits of exceptional stability, good repeatability, and, consequently, it was successfully applied for simultaneous sensitive detection of DA and UA in human serum samples.
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Advanced Optical Materials
·
2024
·
IF 8
Rongyi Kuang,Huiwang Lian,Yunfei Zhu,Simin Gu,Lin Huang,Bo-Mei Liu,Jing Wang
Inorganic photochromic luminescent materials hold immense promise as potential candidates for optical information storage applications. Unfortunately, static and single reading mode of photochromic luminescent materials in bright and dark environments pose a security threat to the stored information. Here, a novel material La 2 MgSnO 6 :Er 3+ ,Fe 3+ is developed, possessing both reversible photochromic and adjustable upconversion/downconversion photoluminescent (PL) properties. Upon exposure to 275 nm ultraviolet (UV) light, the sample changes in color from white to brown. And this transformation rapidly reverses when exposed to 365 nm UV light, resulting in a corresponding alteration in luminescence intensity. Notably, when combined with photochromic, the 980 nm excited upconversion PL maintains stable luminescence, while the 365 nm excited downconversion PL exhibits significant intensity changes. Inspired by this unique feature, a dark-field selective dual-mode reading is proposed that depends on the excitation wavelength, including static decrypt in long-time cases and dynamic reading in time-limited situations. These findings have the potential to revolutionize high-security data storage applications and drive advancements in the field.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Yue Zhang,Gang Li,Qiuyu Guo
A series of composites based on Fe-based MOF (Fe-BDC) and CdSe quantum dots (CdSe QDs) have been synthesized with CdSe QDs well-embedded into Fe-BDC particles, which are characterized by XRD , SEM, TEM, ICP-OES, FT-IR, N 2 physical sorption , UV–visible DRS , PL and electrochemical measurements. By detecting the degradation of Rhodamine B (RhB) in aqueous solution under visible light irradiation, the photocatalytic performance of CdSe@Fe-BDC nanocomposites were apparently improved by 5.8 times relative to single Fe-BDC, which can be attributed to the heterostructure formed in CdSe@Fe-BDC. Owing to the perfect interfacial contact, this promotes electron transfer from CdSe to Fe-BDC and significantly facilitates the separation of the photogenerated electron-hole pairs. The photocatalytic mechanism studied by adding sacrificial agents revealed that the predominant active species in the system is hole cation (h + ) and oxygen free radicals (•O 2 − ).
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Qing-Ting Sun,Bu-De Xu,Jing Yang,Ting-Ting Qian,Hong Jiang
Co-based catalysts can effectively active peroxymonosulfate (PMS) for organic pollutants degradation. However, the loaded Co on porous materials could easily release into the solution during the reaction. Herein, a stable layered double oxide (LDO)-supported Co-Fe bimetal catalyst, i.e., Co 2 FeAl-LDO, was synthesized and used to activate PMS for the degradation of carbamazepine (CBZ, a representative pharmaceutical and personal care product). Results show that Co 2 FeAl-LDO/PMS exhibited high removal of CBZ (>99%) in 30 min with the reaction rate constant ( k obs ) of 0.2103 min −1 . The high activity of Co 2 FeAl-LDO could be caused by the specific structure of the LDO and the synergistic effect of Co, Fe, and Al on the catalyst. The high CBZ removal (88%) at the fifth run of Co 2 FeAl-LDO and the low cobalt release (0.4 mg/L) indicate the high stability of Co 2 FeAl-LDO. The activation and CBZ degradation mechanisms in this highly efficient system were proposed and validated by identifying the radicals and intermediates of CBZ and comparing the active sites on fresh and used Co 2 FeAl-LDO. pH had a significant effect on CBZ degradation. CoOH + and HSO 5 − were the predominant species involved in CBZ degradation under the optimal pH 6.0. The anions and humic acid (HA) inhibited CBZ degradation as they occupied the active sites of the catalyst. This work provides a new substrate to stabilize the active components, and vital information on the synergistic effect of active components during PMS activation.
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ENERGY & FUELS
·
2020
·
IF 3.421
Zenghua Xu,Ximing Zhang,Kai Li,Hongjian Lin,Xiangqun Qian,Kuichuan Sheng
Designing low-cost and sustainable electrode materials for energy storage devices with large energy density and capacitance is still a formidable challenge. Herein, a green, template-free, and facile Fe-decorated porous carbon synthesis strategy derived from bamboo was proposed. This strategy includes hydrothermal carbonization pretreatment, which can tune the carbon morphology and dope iron elements in one step, and a mild KHCO3 activation to improve porosity while retaining the spherical morphology. The optimized Fe-decorated porous carbon exhibited a high surface area (1509.5 m2 g–1) with a carbon sphere/nanosheet architecture, which is beneficial for ion/electrolyte diffusion and increasing the accessibility between the surface area and electrolyte ions. Moreover, the introduced Fe oxides can provide extra pseudocapacitance, which comes from the reversible faradaic reaction between Fe3+ and Fe2+. The resulting carbon material presented a high capacitance of 467 F g–1 at 0.5 A g–1. The assembled KOH-based symmetric supercapacitor displayed a superb cycling performance that can output 99.8% of the initial capacitance after 5000 cycles, and the Na2SO4-based device showed the maximum energy density of 20.31 W h kg–1. Meanwhile, different behaviors in different electrolytes were further analyzed. This work demonstrated that the modification of hydrochar is an effective way to convert biomass into high-performance electrode materials, which has potential for advanced storage device applications.
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