COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Yifang Mi,Sen Zhang,Yufeng Zhao,Guojin Sun,Zhihai Cao
Fe-based activated biochar composites are promising catalysts for environmental remediation. However, the limited efficiency of Fe(III)/Fe(II) cycling reaction of commercial Fe 2 O 3 at neutral conditions still impeded the catalytic performance of the heterogeneous Fenton-like catalysts. In this work, high-performance Fe 2 O 3 /activated biochar Fenton-like catalysts with Taihu blue algae (hazardous algae to aquatic ecosystems) as carbon precursors were synthesized and used for the degradation of methylene blue (MB). The physicochemical properties of Fe 2 O 3 /activated biochar composites including pore structure , the generated N species, and persistent free radicals (PFRs) were effectively tailored by activation temperatures. ACK-7-Fe (prepared under the activation temperature, 700 °C) showed a stronger adsorption ability while ACK-8-Fe (800 °C) exhibited superior MB degradation performance (∼99.97% in 30 min at neutral pH). The former was ascribed to the formation of more mesopores with suitable size which was beneficial for MB adsorption. The latter is due to the promoting effect of pyrrolic N and PFRs on the Fe(III)/Fe(II) cycle, responsible for the high catalytic efficiency of ACK-8-Fe. The hydroxyl radicals were the dominant active radicals evidenced by scavenging experiments and electron spin resonance. Moreover, the. The ACK-8-Fe exhibited superior reusability, which was crucial for its practical applications.
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FUEL
·
2022
·
IF 8.035
Yangfan Chen,Hongyan Yan,Wenxin Teng,Jiangling Li,Weizao Liu,Shan Ren,Jian Yang,Qingcai Liu
NH 3 -SCR technology with commercialized V 2 O 5 -WO 3 (MoO 3 )/TiO 2 catalysts has become the most efficient technology for the removal of NO x from coal-fired power plants. However, the weaknesses of V 2 O 5 -WO 3 (MoO 3 )/TiO 2 catalysts such as the biotoxicity of vanadium species and high cost restrict their increased applicability. Fe 2 O 3 -based NH 3 -SCR catalysts show potential in placing traditional catalysts due to their good N 2 selectivity, excellent environmentally friendly performance, high thermal stability, and low cost. In this work, low cost Fe 2 O 3 -containing solid waste was exploited as the base material for NH 3 -SCR catalyst preparing. Moreover, bulk MoO 3 and MoO 3-x nanosheets decorated Fe 2 O 3 composite NH 3 -SCR catalysts were synthesized and both revealed conspicuously improved NO x removal efficiency compared with bare-Fe 2 O 3 catalyst. However, the N 2 selectivity of these two catalysts showed significant differences. Therefore, comprehensive characterizations, NH 3 oxidation experiments, and in-situ diffusion Fourier transform infrared spectroscopy (DRIFTS) experiments were performed to determine the N 2 O formation pathways of the above two catalysts. The redox properties were highly related to the N 2 O generated from NH 3 oxidation. Moreover, the huge difference in NH 3 and NO adsorption ability led to disparate reaction mechanisms over the two catalysts. This new understanding of the N 2 O formation mechanism has the potential to guide the rational design of improved NH 3 -SCR catalysts suffering from low N 2 selectivity.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xiaoqi Zhao,Yingxiao Li,Xue Zhang,Yanfang Gao,Ling Liu
Surface oxygen vacancy increases active site numbers, and multidimensional cross-linked structure improves the exposure of active sites. Thereby, they can enhance the oxygen reduction reaction (ORR) performance of Fe-N-C catalysts effectively. Herein, Fe(NO 3 ) 3 ·9H 2 O and carbon nanotubes (CNTs) were introduced into zeolitic imidazolate framework nano leaves (ZIF-L) to prepare multidimensional cross-linked Fe-N-CNTs with surface oxygen vacancies through co-pyrolysis at the high-temperature. As expected, the synthesized multidimensional cross-linked Fe-N-CNTs-900-0.2 composite rich in oxygen vacancies increased the conduction band potential and improved the reducing capacity. Thus, Fe-N-CNTs-900-0.2 possessed a better ORR electrochemical performance (half-wave potential = 0.892 V vs. RHE) that surpass the Pt/C catalysts. Moreover, the Al-air batteries containing Fe-N-CNTs-900-0.2 displayed a higher maximum power density than those of Pt/C catalysts. The electronic band structure shows that Fe-N-CNTs-900-0.2 rich in oxygen vacancy concentration has higher conduction band potential and effectively improves the activity of ORR catalysts. This work innovatively proposes that the joint work of multidimensional cross-linked structure and oxygen defects is an effective method to enhance the ORR performance and clarifies its internal reaction mechanism, which provides a new idea to design and preparer Fe-N-C catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Lixia Wang,Yanjing Qin,Huatong Li,Zhiyang Huang,Mingcheng Gao,Tayirjan Taylor Isimjan,Xiulin Yang
Designing multi-channel mesoporous structure and introducing oxygen vacancies to synergistically enhance oxygen reduction reaction (ORR) activity is crucial for the practical application of zinc-air batteries (ZABs) in the field of energy storage and conversion. Herein, a novel multi-channel mesoporous Bi-Fe 2 O 3 microsphere with abundant oxygen vacancies supported on nitrogen-doped carbon (denoted as Bi-Fe 2 O 3 @NC) is constructed and the designated catalyst demonstrates a higher half-wave potential (0.88 V), large limiting current density (5.8 mA cm −2 @0.4 V), and superior stability. Besides, the aqueous ZAB utilizing Bi-Fe 2 O 3 @NC cathode achieves a high power density of 198.6 mW cm −2 and maintains exceptional stability for 459 h at 5 mA cm −2 , superior to most previously reported catalysts. Furthermore, a solid-state ZAB assembled with Bi-Fe 2 O 3 @NC shows a power density of 55.9 mW cm −2 , highlighting its potential for flexible ZAB applications. The prominent ORR performance of Bi-Fe 2 O 3 @NC can be ascribed to its unique multi-channel mesoporous structure and abundant oxygen vacancies, which increase the exposure of active sites and facilitate efficient electron/mass transport. This work provides valuable insights for the rational design of advanced ORR catalysts for the practical requirements of aqueous/flexible ZABs in energy storage and conversion.
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Inorganic Chemistry Frontiers
·
2022
·Vol. 10
·期 2
·406-416
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IF 7.779
Zhenyuan Ji,Guanxiang Tang,Dongwei Ma,Lizhi Chen,Guoxing Zhu,Jun Zhu,Xiaoping Shen
Devising electrode materials with novel configurations and unique properties is a feasible strategy to boost the electrochemical properties of hybrid supercapacitors. This research demonstrates an effective two-step strategy to construct N,S co-doped porous carbon (NSC) sphere supported CoS nanoparticles with phosphate functionalization (P-NSC/CoS). Benefiting from the active multi-components, the electrochemical features of CoS can be remarkably modulated after the NSC and phosphate modifications. As the cathode material for the supercapacitor, the acquired P-NSC/CoS composite delivers a splendid capacity of 436.5 C g−1 at 1 A g−1 and a superb cycling property of 91.5% after 10 000 cycles at 10 A g−1 in 6 M KOH. Furthermore, the Fe2O3 nanocrystals with ultrafine size are in situ deposited on NSC via a solvothermal-calcination process. The NSC/Fe2O3 composite presents a sizeable capacitance of 433 F g−1 at 1 A g−1 with 100.6% capacitance retention after 10 000 cycles. More significantly, it is inspiring that the assembled P-NSC/CoS//NSC/Fe2O3 hybrid supercapacitor delivers an energy density of up to 64.3 W h kg−1 at 873.6 W kg−1 and a splendid cycling stability of 94.2% after 10 000 cycles at 5 A g−1 in 6 M KOH. The appreciable data demonstrate that the prepared advanced electrode materials and the hybrid supercapacitor display excellent application prospects in energy storage.
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Journal of Cleaner Production
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2022
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IF 11.072
Tiedong Lu,Tianming Su,Xuelian Liang,Yuansong Wei,Junya Zhang,Tieguang He
In this study, the dual character of the methane production and fate of antibiotic resistance genes (ARGs) were evaluated after adding nano-Fe 2 O 3 (NF) during anaerobic digestion (AD) of swine manure, concerning the different exposure times (ET). NF has a decreasing effect on methane production, and the inhibitory effect is proportional to the dosage. NF350 decreased the accumulative methane production by about 7.8% when the ET was 30 days due to the disruption of cellular integrity and the damage to the bacterial communities. Nonetheless, NF could improve the maximum specific methane production rate by up to 24.5% when the ET was shorter than 12 days. And the changes in the relative abundance of ARGs were proportional to the daily methane production at this stage. The addition of NF in a short time is helpful for methanogenic activities, which might be correlated with direct interspecies electron transfer (DIET). NF specifically enhanced the reduction of tetracycline resistance genes with antibiotic target protection (40.7%) and aminoglycoside resistance genes with antibiotic inactivation (34.0%) when the ET was 30 days. It was speculated that the specifical reduction was mainly due to that higher NF could produce the ROS (reactive oxygen species), down regulate key enzyme actions in phosphorylation, acetylization, and nucelotidylalation with antibiotic inactivation, and reduces the reduction of selective pressure for tetracycline. Environmental variables and microbial community were the major factors causing the changes of the ARGs by Structural equation models (SEM) and Procrustes analysis. These results illustrated that resonable NF addition could help to improve the accumulative methane production and reduce ARGs during AD of swine manure.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Zhihua Gao,Fengyan Fu,Zhaozhi Zhang,Lili Niu,Min Jin,Jian Zhang,Zekun Zhao
Support materials are indispensable to promote the durability of iron oxides for chemical looping applications. However, the dilution effect of supports on the active phase would lead to decreased bulk oxygen conduction, thus leading to compromised activity. Here, we propose several Gd 3+ , La 3+ and Nd 3+ doped CeO 2 as active supports for iron oxides and investigate the support effect to improve hydrogen generation via chemical looping water gas shift . The characterizations show that the dopants improve the oxygen vacancy concentration in the CeO 2 lattice and Fe 2 O 3 /Ce 0.8 Gd 0.1 La 0.1 O 2-δ exhibits the most oxygen vacancy concentration among all the oxygen carriers. Pulse reactions of oxygen carriers show that an abundance of oxygen vacancy concentration can promote the lattice oxygen transfer in bulk, thus contributing to improved redox reactions . The high oxygen conductivity mitigates the dilution effect on the active phase. Therefore, Fe 2 O 3 /Ce 0.8 Gd 0.1 La 0.1 O 2-δ shows the highest hydrogen yield (∼9.49 mmol −1 .g −1 ) and hydrogen generation rate (∼0.632 mmol.g −1 .min −1 ) with only a slight decrease at 650 °C over 100 cycles. Overall, this work highlights the influence of support properties on the redox reactivity of iron oxides for chemical looping applications.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xufei Li,Yanling Qiu,Zhiliang Zhu,Ting Chen,Hua Zhang,Daqiang Yin
Insufficient photocatalytic activity and poor recyclability are considered as two main factors that limit the further application of photocatalysts in environmental remediation. Herein, a new magnetic g-C 3 N 4 /α-Fe 2 O 3 /Bi 3 TaO 7 (CN/FO/BTO) heterojunction with dual Z-scheme system was first synthesized via an ultrasound-assisted calcination process. The results showed that the removal efficiency of ciprofloxacin (CIP) by optimized CN/FO/BTO heterojunction could reach 95.6% within 120 min illumination of visible light, which was 6.1, 15.9, 5.2, 3.7 and 2.3 times as much as that of single CN, FO, BTO, binary CN/FO and CN/BTO, respectively. Characterization analysis indicated that the improved photocatalytic activity derived from the synergistic effects of the three components, including the dispersion of FO and BTO by CN sheet, the enhanced light absorption of CN by addition of FO and BTO, and the reduced photogenerated charge recombination by their intimate contact. Further mechanism study revealed that the dual Z-scheme system of CN/FO/BTO leaded to efficient photoexcited carrier separation and strong redox capacity, in which •O 2 – and •OH were main radicals during photocatalytic process. Meanwhile, CN/FO/BTO possessed supreme adaptability to pH as well as co-existing matters, favorable magnetic separation property and excellent stability, making it a potential candidate for environmental remediation applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 27
·70260-70276
·
IF 5.8
Yang Guoliang,Jiang Yan,Yin Bingjie,Liu Guocheng,Ma Dong,Zhang Guangshan,Zhang Guodong,Xin Yanjun,Chen Qinghua
Polycyclic aromatic hydrocarbons (PAHs) in soil have potential harm on human health. However, remediation of PAH-contaminated soils through photocatalytic technology remains a challenge. Therefore, the photocatalyst g-C 3 N 4 /α-Fe 2 O 3 was synthesized and applied to photocatalytic degradation of fluoranthene in soil. The physicochemical properties of g-C 3 N 4 /α-Fe 2 O 3 and various degradation parameters, such as catalyst dosage, the ratio of water/soil, and initial pH, were investigated in detail. In soil slurry reaction system (water/soil=10:1, w/w), the optimal degradation efficiency on fluoranthene was 88.7% after simulated sunlight irradiation for 12 h (contaminated soil=2 g, initial fluoranthene concentration=36 mg/kg, catalyst dosage=5%, and pH=6.8), and the photocatalytic degradation followed pseudo-first-order kinetics. The degradation efficiency of g-C 3 N 4 /α-Fe 2 O 3 was higher compared with P25. Degradation mechanism analysis showed that •O 2 - and h + are the main active species in photocatalytic degradation process of fluoranthene by g-C 3 N 4 /α-Fe 2 O 3 . Coupling g-C 3 N 4 and α-Fe 2 O 3 enhances the interfacial charge transport capacity via Z-scheme charge transfer route and inhibits the recombination of photogenerated electrons and holes of g-C 3 N 4 and α-Fe 2 O 3 , then significantly improves the production of active species and photocatalytic activity. Results showed that photocatalytic treatment of soil by g-C 3 N 4 /α-Fe 2 O 3 is an effective strategy for remediation of soils contaminated by PAHs.
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Chunyan Hu,Jinke He,Jianjun Liang,Tao Lin,Qiuliang Liu
A novel photo-Fenton catalyst α-Fe 2 O 3 @g-C 3 N 4 @NH 2 -MIL-101(Fe) (FGN) with dual Z-scheme heterojunction was successfully prepared by hydrothermal method to degrade tetracycline (TC). The preparation conditions were optimized by orthogonal test, and the successful synthesis was confirmed by characterization analyses. The prepared FGN showed better light absorption performance, higher photoelectrons-holes separation efficiency, lower photoelectrons transfer resistance, and higher specific surface area and pore capacity compared with α-Fe 2 O 3 @g-C 3 N 4 and α-Fe 2 O 3 . The effects of experimental conditions on the catalytic degradation of TC were investigated. The degradation rate of 10 mg/L TC could reach 98.33% within 2 h when the dosage of FGN was 200 mg/L, and the degradation rate could remain 92.27% after 5 times of reuse. Furthermore, the XRD spectra and XPS spectra of FGN before and after reuse were compared to explore the structural stability and catalytic active sites of FGN, respectively. According to the identification of oxidation intermediates, three degradation pathways of TC were proposed. Through H 2 O 2 consumption experiment, radical-scavenging experiments, EPR results, the mechanism of the dual Z-scheme heterojunction was proved. The improved performance of FGN was attributed to the dual Z-Scheme heterojunction effectively promoting the separation of photogenerated electrons from the holes and accelerating the electrons transfer , and the increase of the specific surface area.
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NANOTECHNOLOGY
·
2021
·Vol. 33
·期 9
·095601
·
IF 3.874
Lulu Yu,Min Liu,Yanling Zhang,Yun Ni,Shaobo Wu,Ruijiang Liu
A magnetically induced self-assembly DNAzyme electrochemical biosensor based on gold-modified α-Fe2O3/Fe3O4 heterogeneous nanoparticles was successfully fabricated to detect Nickel(II) (Ni2+). The phase composition and magnetic properties of α-Fe2O3/Fe3O4 heterogeneous nanoparticles controllably prepared by the citric acid (CA) sol–gel method were investigated in detail. The α-Fe2O3/Fe3O4 heterogeneous nanoparticles were modified by using trisodium citrate as reducing agent, and the magnetically induced self-assembly α-Fe2O3/Fe3O4–Au nanocomposites were obtained. The designed Ni2+-dependent DNAzyme consisted of the catalytic chain modified with the thiol group (S1-SH) and the substrate chain modified with methylene blue (S2-MB). The MGCE/α-Fe2O3/Fe3O4–Au/S1/BSA/S2 electrochemical sensing platform was constructed and differential pulse voltammetry was applied for electrochemical detection. Under the optimum experimental parameters, the detection range of the biosensor was 100 pM–10 μM (R2 = 0.9978) with the limit of detection of 55 pM. The biosensor had high selectivity, acceptable stability, and reproducibility (RSD = 4.03%).
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Huan Chai,Lili Gao,Peng Wang,Feng Li,Guowen Hu,Jun Jin
The application of hematite(α-Fe 2 O 3 )-based photoanodes in photoelectrochemical (PEC) water oxidation has been hampered by disgusting charge recombination and difficult carrier migration. Herein, we modified indium sulfide (In 2 S 3 ) nanoparticles on the surface of fluorine-doped α-Fe 2 O 3 (F-Fe 2 O 3 ) nanorods . The In 2 S 3 /F-Fe 2 O 3 heterostructure bonded by S-O chemical bond shows a superior photocurrent density of 2.21 mA cm −2 at 1.23 V versus reversible hydrogen electrode (around 3.45 times higher than that of pristine α-Fe 2 O 3 ). In-depth investigations show that In 2 S 3 /F-Fe 2 O 3 has significantly increased donor density and decreased charge transfer resistance. Simultaneously, In 2 S 3 decorated with S-O bond could reduce the surface defect states. Further studies of energy band location reveal the formation of type-Ⅱ heterojunction between In 2 S 3 and F-Fe 2 O 3 . The unique heterostructure provides a powerful driving force for charge separation and transport, resulting in satisfactory bulk phase and surface separation efficiency. This work provides ideas for the design and study of multicomponent photoanodes.
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