PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2023
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IF 7.8
Zezheng Lin,Yang Guo,Xiaoxuan Qu,Yuying Xiang,Shuwen Shen,Xin Zhu
Widely diffused pollution of endocrine disrupting chemicals (EDCs) has indeed threatened the safety of ecological environment and human health. A hydrangea-like Fe doped BiOBr (Fe-BiOBr) microsphere was synthesized and used to enhance the performance of UV/persulfate (PS) system using bisphenol A (BPA) as the targeted contaminant. The photochemical characterization of Fe-BiOBr showed that Fe doping markedly improved the separation efficiency of photoelectron and hole, and enhanced the utility rate of luminous energy of BiOBr. Degradation test demonstrated that with the assistance of Fe-BiOBr, the efficiency of UV/PS system was increased by 1.8 times, while 85.7% of BPA can be degraded within 10 min. Through scavenging experiments, sulfate radical (SO 4 •− ), superoxide radical (O 2 •− ), and hole were demonstrated as the dominate reactive species (RSs) in UV/Fe-BiOBr/PS system. Then, the role and mutual transformation of RSs was further clarified by radicals steady-state concentrations estimation and X-ray photoelectron spectroscopy (XPS) analysis. Based on the results, the produced O 2 •− can be subdivided into confined O 2 •− and free O 2 •− from the UV induced oxygen vacancy and photoelectron, respectively. Of which, SO 4 •− and confined O 2 •− were symbiotic via the redox cycle of Fe species. Significantly, only 2.6% of TOC can be simultaneously removed within 10 min treatment time, suggesting the incomplete degradation of BPA. For this, 16 organics was detected using LC-MS and the degradation route of BPA was also determined based on the intermediates analysis. Finally, the application possibility of the system was evaluated from the perspective of ecotoxicity by ECOSAR and T.E.S.T. softwares. This study investigates the dual effect of transition metal doped semiconductor on coupling system, and provides new insights into the role of O 2 •− .
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Zewen Xu,Zhongyi Ren,Haojiang Zhu,Hao Guo,Xinliang Liu,Ming Wang,Yingfei Hou
Layer-by-layer (LBL) assembly method, with the advantages of simple operation and strong universality, has attracted much attention recently. However, the weak molecule-to-molecule and molecule-to-ion interactions have limited its development. During this work, the molecule-to-solid interaction was adopted and a robust LBL coating was achieved by alternately depositing positively charged Fe(OH) 3 colloids and negatively charged sodium alginate molecules. The molecule-to-solid interaction could continuously regenerate under corrosive conditions due to water insolubility and the chemical stability of solids. When the electrostatic interaction was broken, the abundant chemically stable solids acted as anchors to immobilize the soluble molecules and maintain the stability of the LBL coating. The prepared superwettable membranes exhibited superior oil-in-water emulsion separation efficiency, anti-fouling properties, and chemical stability. Meanwhile, the separation performance survived one week's harsh environments of strong acid and alkali.
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CHEMOSPHERE
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2020
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IF 5.778
Tianchan Zang,Hao Wang,Yinghao Liu,Li Dai,Shuang Zhou,Shiyun Ai
The disposal and management of waste sludge is a considerable challenge for environmental protection and resource utilization. Herein, sludge-based biochar material loaded with nano-Fe 3 O 4 (xS@Fe-y) was fabricated via hydrothermal carbonization process and employed as catalyst to activate peroxymonosulfate (PMS) for degrading organic dyes in wastewater. Benefiting from the proper iron content, porous structure and the good dispersibility of iron on the catalyst surface, the proposed 5S@Fe-500 catalyst not only exhibited excellent catalytic activity and durability in the activation of PMS to degrade Rhodamine B (RhB), which was almost completely removed in 10 min (50 mL 50 mg L −1 ), but also performed broad application prospects in pollutant degradation . More importantly, the free radical quenching test and electron spin-resonance spectroscopy (ESR) detection demonstrated that O 2 • - , SO 4 • - , OH and 1 O 2 were generated during the process of catalyst activation of PMS. Based on this, a possible reaction pathway for degrading RhB with the aid of 5S@Fe-500 was put forward. It is believed that this work offers a promising reuse method of converting the waste sludge to a high efficiency and low-cost nano magnetic catalyst to activate PMS for degrading refractory organic pollutants in aquatic surroundings.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Fengliang Cao,Qingshan Zhao,Debin Kong,Xiaojie Tan,Xinxin Li,Tengfei Liu,Linjie Zhi,Mingbo Wu
Atomically dispersed metal-nitrogen-carbon (M-N-C) catalysts show great potential for heterogeneous catalysis. However, recognizing and engineering the microenvironment of M-N x sites to achieve satisfactory catalytic performance remains challenging. Herein, we propose a facile g-C 3 N 4 -assisted template strategy to anchor atomic Fe-N 4 sites on highly nitrogen-doped carbon nanosheets. Through regulating the ratio and type of peripheral nitrogen species by carbonization temperature, the optimal Fe-N-C-800 catalyst showed significantly boosted catalytic activities (overall turnover frequency of 13.43 min −1 and activation energy of 19.44 kJ mol −1 ) for nitroarene reduction with extremely low reductant dosage, exceeding most reported metal catalysts. Experimental and theoretical results reveal appropriate graphitic- and pyrrolic-N dopants surrounding the Fe-N 4 center can tailor the local electronic structure and contribute to obvious upshift of the d-band center, which dramatically promotes the adsorption and conversion of reactant substrates, eventually delivering the unprecedented catalytic performance. This work provides a guide for rational coordination environment regulation of single-atom catalysts for efficient chemical transformations.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
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IF 5.8
Zhong Dengjie,Liu Peng,Liu Yi,Xu Yunlan
The Zn/Fe@N-doped porous graphitic carbon catalyst (Zn/Fe@PCN) was successfully produced through one-step pyrolysis of g-C 3 N 4 and Zn/Fe-MOF and was used for the activation of persulfate (PS) for the degradation of RhB. The Zn/Fe@PCN/PS system was able to degrade 95.92% of RhB in 30 min at a rate of 0.6453 min −1 when RhB was concentrated at 50 mg L −1 . The efficient degradation of RhB is primarily realized through the synergistic activation of PS by Zn, Fe, and N to produce reactive oxygen species 1 O 2 , \(\cdot{\mathrm{O}}_2^-\) , \(\cdot \mathrm{SO}_4^-\) , and ·OH. Zn 0 /Fe 0 in Zn/Fe@PCN forms a galvanic cell with carbon to release electrons to join in the activation of PS. The doping of Zn not only provides sufficient electrons for the activation of PS but also promotes the effective reduction of Fe 2+ and thus the Fe 2+ /Fe 3+ cycle. The N doping accelerates the electron transfer during the reaction progress.
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PubMed
高影响因子
FOOD CHEMISTRY
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2023
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IF 8.8
Yu-Han Sun,Liu Yang,Xian-Xian Ji,Yuan-Zhen Wang,Yu-Long Liu,Ying Fu,Fei Ye
Flusilazole is a triazole fungicide with residues that are potentially toxic to humans. It enters the human body mainly through food, although its bactericidal activity is substantial. In this study, an electrochemical sensor Fe/Fe 2 O 3 @C with a core–shell structure was constructed to efficiently detect flusilazole by annealing MIL-53(Fe) which was prepared by a simple solvothermal method. Transmission electron microscopy and scanning electron microscopy were used to characterize the apparent morphology of MIL-53(Fe) and Fe/Fe 2 O 3 @C , and their structures were further characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, powder X-ray diffraction, and the mapping of elements by energy dispersive spectroscopy. The electrochemical behavior of Fe/Fe 2 O 3 @C in the detection of flusilazole was evaluated by differential pulse voltammetry under optimal conditions. The results of the study indicate that the Fe/Fe 2 O 3 @C electrochemical sensor displayed excellent detection capabilities for flusilazole, where the sensor exhibited a wide detection range from 1.00 × 10 −4 to 1.00 × 10 −12 mol/L with an incredibly low LOD of 593 fM, making it highly sensitive to trace amounts of flusilazole. Moreover, Fe/Fe 2 O 3 @C demonstrated superior reproducibility, stability, and resistance to interference, highlighting its reliability in practical applications. The sensor was also successfully utilized to quantitatively detect flusilazole in various real samples, which suggests that Fe/Fe 2 O 3 @C has broad-spectrum environmental resistance and can effectively and rapidly detect flusilazole residues in different types of food items and environmental matrices. The study also delved into the mechanism of Fe/Fe 2 O 3 @C for the detection of flusilazole, providing a deeper understanding of the functionality of this sensor. Overall, these findings emphasize the practical significance of Fe/Fe 2 O 3 @C as an electrochemical sensor, showcasing its potential for real-world applications in food safety and environmental monitoring.
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PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2023
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IF 4.1
Meiling Zhan,Minghao Fang,Liangyu Li,Yajing Zhao,Bozhi Yang,Xin Min,Pengpeng Du,Yan'gai Liu,Xiaowen Wu,Zhaohui Huang
In the pursuit of enhancing the property of photocatalytic hydrogen production , strategies for enhancing light absorption and the separation and transport efficiency of photo-induced carriers have been studied. Perovskite photocatalyst has great application potential in the field of photocatalytic hydrogen production due to its special crystal structure. LaMn (1-x) Fe x O 3 (x = 0–0.08) perovskite nanofibers with diameters of 50–200 nm were synthesized by electrospinning, and their photochemical properties were investigated. The results of UV–Vis diffuse reflectance spectroscopy, PL spectroscopy, I-t, and EIS revealed that the doping with Fe could improve light absorption and reduce the recombination rate of photogenerated electron-hole pairs, and improve the separation and transfer efficiency of photogenerated electron-hole pairs, likely due to the increased concentration of oxygen vacancies caused by doping. Through optimization of the Fe doping amount, an improved hydrogen production efficiency of 767.71 μmol h −1 g −1 was achieved for LaMn 0·96 Fe 0·04 O 3 , which is 2.5 times the efficiency of undoped LaMnO 3 (300.74 μmol h −1 g −1 ). These results provide a new idea for the development of efficient photocatalysts for hydrogen production.
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ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Xinna Zhao,Guangbing Liang,Hui Wang,Zhenping Qu
Platinum (Pt) is a nonrenewable mineral with limited reserves and a patchy distribution. Pt demand and consumption are growing year after year. As a result, recovering Pt from the secondary resources is critical. A new strategy for effective Pt recovery employing Fe(III)-oxalate complexes under UV and visible light irradiation is proposed in this paper. This approach can recover 98.9% of Pt in 30 min under the conditions of 365 nm UV irradiation, leaching time = 30 min, C2O42– concentration = 333.33 g/L, and H2O2 addition = 0.60 vol %. More importantly, 95.6% of Pt can also be recovered in 8 h under sunlight. The homogeneous photocatalytic reaction is rapid and efficient, and meanwhile, no strong acid, base, or volatile toxic organic solvent is required. Additionally, the iron utilized in the process may be well-recycled, solving the problem of recovery difficulty of homogeneous photocatalysts and lowering the cost of leaching. Simultaneously, the Pt complex recovered from the waste catalyst is utilized in situ to manufacture 0.1 wt % Pt/ZSM-5 catalyst, which shows the complete conversion of toluene at 200 °C and can remain stable during the long duration reaction of 1200 min. Overall, it can not only provide a new environmentally friendly technique to recycle Pt from spent catalysts but also save manufacturing cost of new catalysts.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Xinyu Song,Yang Shi,Zelin Wu,Bingkun Huang,Xinhao Wang,Heng Zhang,Peng Zhou,Wen Liu,Zhicheng Pan,Zhaokun Xiong,Bo Lai
The discriminative activities and mechanisms for activation of O-O bond in peroxy compounds via single-atom catalysts (SACs) especially with a higher coordination number (M-N 5 ) are rarely explored. Herein, the atomic catalyst (Fe-SAC) with Fe-N 5 as the active center was constructed, which could simultaneously and effectively activate peroxymonosulfate (PMS), peroxydisulfate (PDS), and hydrogen peroxide (H 2 O 2 ). Density functional theory (DFT) calculations combined with experiments results demonstrated that the degradation efficiencies of acyclovir were corresponding to the changes of O-O bond length in various peroxy compounds. Meanwhile, the experiments exposed that the three oxidants all produced • OH, but the PMS also contained 1 O 2 and Fe(IV)=O, and PDS contained O 2 •- additively. The scale-up experiment showed Fe-SAC could operate steadily for nearly 7 d. Overall, this work unveils the discriminative mechanisms for activation of O-O band in different Fenton-like systems. Moreover, the Fe-SAC with high coordination numbers has excellent catalytic properties and practical performance.
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Journal of Water Process Engineering
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2023
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IF 7
Fuwang Zhao,Yanling Yang,Siyang Ji,Rui Yu,Xing Li,Zhiwei Zhou
A photo-Fenton catalyst Fe‑carbon nitride (g-C3N4)/reduced graphene oxide (rGO) (labeled as FNGO) was prepared via two-step calcination thermal polymerization. rGO as a carrier of Fe-g-C3N4 accelerated the charge transfer and improved the reduction of Fe (III) as compared those of the binary Fe-g-C3N4 catalyst. The FNGO catalyst maintained a high surface area of 264.7 m2/g and its charge transfer rate was 2.77 times higher than Fe-g-C3N4. The decreasing transient photocurrent and increasing electrode resistance of FNGO, Fe-g-C3N4 and g-C3N4 confirm the positive synergistic effect of Fe N coordination and rGO in charge transfer. Under the synergistic of visible light irradiation and H2O2, the excellent degradation performance of FNGO towards rhodamine B was achieved (95.3 % removal) at Fe-doping content of 10 wt%, rGO loading content of 0.5 % and H2O2 addition of 1.5 mM. Hydroxyl radicals played a dominant role in the photocatalysis-Fenton system, which was related to the coordination of Fe N, the carrier off-domain of rGO, and the Fe (III)/Fe (II) cycle promoted by photogenerated electron and superoxide radicals. The FNGO had a high stability, a wide pH adaptation (3– 11) and a low Fe-leaching. This novel ternary light-driven photo-Fenton catalyst of FNGO enabled efficient decontamination during advanced treatment of wastewater.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yin Wang,Qikui Man,Shiqi Zhu,Zhenkuang Lei,Guoguo Tan,Hongtao Guan
It’s a hurry to introduce a lightweight and high-efficiency microwave absorption material that is easy to synthesize, since the electromagnetic interference pollution is getting increasingly serious. Carbon-based microwave absorption material based on bimetallic metal-organic frameworks (MOFs) gets high conductivity and good magnetism at the same time, and thus can be regarded as an efficient microwave absorber with lightweight. Herein, we introduce an easy method to compose bimetallic carbon-based microwave absorbers based on ZIF-67. By changing the proportion of Fe 3+ and Co 2+ , not only the magnetism of the material can be adjusted, the amount of carbon nanotubes (CNTs) and so as the dielectric property of the material can also be regulated. The method of introducing precursors at room temperature and then calcinating at an Ar atmosphere is simple to repeat and appropriate for mass production. When the dosage molar ratio of Co 2+ : Fe 3+ is 3: 2, the minimum reflection loss ( RL min ) can reach − 24.83 dB while the effective absorption bandwidth (EAB) can reach 5.14 GHz when the thickness is 1.7 mm, under a 30 wt% filling loading. We believe that this work can provide a reliable method to introduce carbon-based microwave absorption material based on bimetallic MOF materials.
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JOURNAL OF POWER SOURCES
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2023
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IF 9.2
Haiyang Lan,Jiaming Chu,Xingyu Chen,Qi Zhou,Weitao Jin,Yanhong Zhang,Juan Zhou
In a direct ammonia proton ceramic fuel cell (DA-PCFC), attaching a catalyst layer on the surface of the ammonia electrode is known to optimize the cell's electrochemical performance and long-term stability. In this study, the Fe catalyst layer is added to the ammonia electrode of the full cell which is prepared with the structure Ni– BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-δ (BZCYYb) (support layer)|Ni-BZCYYb (active layer)|BZCYYb|La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ to investigate its impact on the electrochemical performance and stability of the electrode. Under the conditions of 700 °C and 20 ml min −1 ammonia fuel, the peak power densities of cells with and without the Fe layer reach 585.051 and 463.671 mW cm −2 , respectively. It is evident that the addition of the Fe catalytic layer significantly improves the electrochemical performance of the cell. Stability tests are carried out for cells with and without the Fe layer at 650 °C, 0.36 A cm −2 , and 0.32 A cm −2 constant current discharge. After discharge for 313 and 372 h, both cells show good stability, and the discharge curves of the two cells are consistent after 100 h. The high M − N binding energy of the Fe catalytic layer improved the initial performance of the cell, but this improvement is not sustained over the stability.
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