APPLIED CATALYSIS A-GENERAL
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2019
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IF 4.63
Wenfeng Han,Lingyu Wang,Zhi Li,Haodong Tang,Ying Li,Chao Huo,Guojun Lan,Xiazhen Yang,Huazhang Liu
Iron catalyst was fabricated via simple solid-state reaction of metal nitrates mixture (Fe, K, Al, Ca, Mg, Sm) with oxalic acid dihydrate at room temperature. Iron catalysts prepared by conventional methods, such as co-precipitation and fusing, are also included as comparison. The performances of catalysts were evaluated by the Fischer-Tropsch Synthesis (FTS) in a fixed bed reactor. The results indicate that uniform nanoparticles were obtained with surface area as high as 38.7 m 2 /g prepared by solid-state reaction. Following calcination at 500 °C, γ-Fe 2 O 3 were obtained as the catalyst precursor. By contrast, α-Fe 2 O 3 was the main precursor derived from co-precipitation. In addition, γ-Fe 2 O 3 prepared by solid-state reaction facilitates the formation of active phase, Fe 5 C 2 with the exposure of (021) facet. High Miller index surface (021) facilitates the adsorption and the dissociation of CO, which contributes the high activity and high selectivity to light olefins. Consequently, compared with conventional catalysts, solid-state reaction derived catalysts exhibit much higher FTO reaction activity and selectivity to lower olefins. The FTY value of 5.62 × 10 ̶ 3 mol CO g Fe ̶ 1 s ̶ 1 was obtained which is almost two times higher than that of catalyst prepared by co-precipitation (3.19 × 10 ̶ 3 mol CO g Fe ̶ 1 s ̶ 1 ) or 3 times higher than that of catalyst prepared by fusing method (1.98 × 10 ̶ 3 mol CO g Fe ̶ 1 s ̶ 1 ). The selectivity to light olefins of around 40% is obtained which is significantly higher than that of the reference catalysts (25% and 33% respectively). The present study provides a promising pathway to prepare iron based catalysts at room temperature.
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APPLIED SURFACE SCIENCE
·
2026
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IF 6.6
Yingying Chen,Zhihua Liu,Jinshan Liu,Miao Zhou,Zhifeng Liu
Tetracycline hydrochloride (TCH) has emerged as a pressing environmental issue due to their extensive use and recalcitrant nature. The integration of Fenton reaction with photoelectrocatalysis, forming a photoelectro-Fenton system, is emerging as a promising strategy for advanced water treatment. This study aims to address the critical challenges of severe charge recombination and sluggish surface reaction kinetics in α-Fe 2 O 3 during photoelectrocatalytic pollutant degradation. Through Co-doped modification, Fe 2−x Co x O 3 photoanodes were successfully fabricated. The results demonstrate that partial substitution of Fe 3+ by Co 2+ not only effectively enhances charge carrier concentration but also induces the formation of substantial oxygen vacancies. This synergistic effect consequently leads to significantly improved electrical conductivity and expanded visible-light absorption range. Firstly, Co 2+ functions as an electron donor, continuously reducing Fe 3+ to Fe 2+ and thereby sustaining the cycling of the Fe 3+ /Fe 2+ . Concurrently, this process facilitates the efficient and continuous conversion of oxygen to H 2 O 2 via a two-electron reduction pathway. Secondly, the coexisting Co 2+ /Co 3+ and Fe 2+ /Fe 3+ bimetallic cycles on the material surface enabling sustained activation of H 2 O 2 to trigger the Fenton reaction, which generates substantial amounts of highly reactive hydroxyl radicals (·OH) and other active substances, achieving rapid decomposition and mineralization of TCH molecules.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Changhui Zhou,Jinhua Li,Yan Zhang,Jing Bai,Pengbo Wang,Bo Zhang,Lina Zha,Mingce Long,Baoxue Zhou
Sulfurous and nitrogenous oxides, including NO x and SO 2 , and the generated substances NO x - and SO 3 2- widely exist in air and water as pollutants and thus are difficult to control in the environment. In this study, we designed a novel photoelectrocatalytic (PEC) system for the efficient conversion of SO 2 and NO x in mixed gases and NO x - and SO 3 2- in wastewater to N 2 and SO 4 2- , respectively, by activating SO 3 2- to form SO 3 • - . The key ideas include the conversion of SO 3 2- from SO 2 and efficient activation of SO 3 2- into SO 3 • - and further conversion into SO 4 • - by the MoS 2 /Fe 2 O 3 photoanode. Simultaneously, NO 3 - /NO 2 - originating from NO x was rapidly reduced to NH 4 + on the CuNW@CF cathode. Ultimately, the generated NH 4 + was selectively oxidized to N 2 by SO 4 • - and SO 4 • - was reduced to SO 4 2- . The results indicated that 99.9 % of TN was removed and 100 % of SO 3 2- was converted to harmless SO 4 2- . This study provides new insights into the treatment of sulfurous and nitrogenous oxides in air and water.
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Journal of Cleaner Production
·
2023
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IF 11.1
Xiunan Cai,Qingling Liu,Qing Yang,Fuzheng Fu,Yanjuan Zhang,Tao Gan,Huayu Hu,Zuqiang Huang
To effectively utilize the hazardous industrial solid waste manganese residue (MR), a MR-derived Fe 2 O 3 -baesd photocatalyst with efficient charge transfer, abundant reactive sites and high redox performance was developed for simultaneously removing organic pollutants and heavy metals . Herein, a novel “confined growth” strategy was proposed to fabricate an amorphous MnO 2 decorated α-Fe 2 O 3 @geopolymer sphere (A-MnO 2 /Fe 2 O 3 @GS) Z-scheme heterojunction by ion exchange method, which was used as a photo-Fenton catalyst for efficiently reducing Cr(VI) and degrading ciprofloxacin (CIP). Characterization results reveal that the 3D hydrangea-like MnO 2 with low crystallinity could not only capture and accelerate electron transfer but also act as an electron conduction bridge and a surface oxygen adsorption site, resulting in efficient separation and utilization of charge. More importantly, the photocatalytic reduction capacity was greatly enhanced in Z-scheme heterojunction owing to the lower conduction band potential of MnO 2 . A-MnO 2 /Fe 2 O 3 @GS showed excellent photocatalytic activity with CIP removal of 99.1% within 40 min and Cr(VI) removal of 97.6% within 50 min, which were 8.13 and 3.47 times higher than those catalyzed by Fe 2 O 3 @GS, respectively. This can be ascribed to the formation of intimate interface, internal electrostatic field , and rich structure defects in the Z-scheme heterojunction. This work offers a new idea to construct Z-scheme photocatalysts with high reactivity for environmental modification.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yuanchuan Ren,Jun Wang,Guangfei Qu,Nanqi Ren,Ping Lu,Xiuping Chen,Zuoliang Wang,Yuyi Yang,Yan Hu
Three-dimensional electrochemical reactor (3DER) is an efficient technology for the treatment of printing and dyeing wastewater. The particle electrode between anode and cathode is the core unit of 3DER, which determines the treatment efficiency of wastewater. However, the deactivation of the particle electrode caused by the coverage of the catalytic sites seriously hindered the continuous operation of 3DER. In this work, γ-Fe 2 O 3 @CNTs particle electrode was prepared by immersion calcination , and its performance was evaluated by degradation of Rhodamine B (RhB) wastewater in 3DER. The study showed that in γ-Fe 2 O 3 @CNTs/Mn@FNE-3DER, the removal rate of RhB reached the best of 99.16% within 7 min under the conditions of γ-Fe 2 O 3 @CNTs dosage of 1.00 g·L -1 , initial RhB concentration of 100 mg·L -1 , pH 7.0, and current density of 20 mA·cm −2 . The superior catalytic activity of the system is mainly due to the charge transfer channel in γ-Fe 2 O 3 @CNTs structure, which improves the mass transfer efficiency of electrons. According to LC-MS analysis, the degradation process of RhB can be divided into five stages: deethylation, chromophore cracking, debenzylation and deamination, ring opening and mineralization. Hydroxyl radicals play an important role in this process. After the reaction, most RhB is converted into CO 2 and H 2 O. In addition, the study also showed that the Fe 3+ /Fe 2+ circulating system formed between the anode and cathode was the important reason for the high degradation efficiency of RhB. After five cycles of experiments, the degradation efficiency of 92.55% was still maintained, indicating that the particle electrode has significant stability and reusability in the catalytic process. To sum up, the excellent performance of γ-Fe 2 O 3 @CNTs particle electrode in three-dimensional electrochemical system provides a promising idea for the actual treatment of printing and dyeing wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Lili Bo,Fang Nian,Lumei Pu,Ping Li,Yusen Hu,Jinhui Tong
Hybrids of α-Fe 2 O 3 /Fe 3 O 4 nanoparticles embedded in N doped graphitic carbon polyhedron layered arrays (FeO x /NCLA) were simply constructed by pyrolyzing the composite precursor of NH 2 -MIL-101(Fe) (a metal organic framework, MOF) and glycylglycine. The experimental and calculated results reveal that the obtained catalysts exhibited multiple active components, synergistic heterojunction effect, high BET surface areas and conductivity, and consequently greatly improved intrinsic electrocatalytic activities and kinetics for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). As the results, the optimized catalyst FeO x /NCLA-1.2 exhibited positive half-wave potential of 0.846 V for ORR and only 218 mV of overpotential (at 10 mA/cm 2 ) for OER in alkaline electrolyte, which is superior than Pt/C (20 %) and RuO 2 , respectively. The Zn-air battery (ZAB) employing the FeO x /NCLA-1.2 as electrocatalyst obtained a peak power density of 104.3 mW·cm −2 , a specific capacity of 840 mAh·g Zn -1 and an energy density of 890 Wh·kg Zn -1 , which is also much higher than that for the noble metal based one. The catalyst is promised to be applied in water electrolysis, fuel cells and metal-air batteries.
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INORGANIC CHEMISTRY
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2022
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IF 5.436
Shan Jiang,Xuemei Jia,Jing Cao,Haili Lin,Fang Li,Yue Sun,Shifu Chen
Photocatalytic overall water splitting simultaneously generates O2 and H2; this is a potential strategy to solve the energy shortage problem. Elemental phosphorus (RP) displays ultralow visible light performance for O2 and H2 generation; thus, a novel α-Fe2O3/RP composite is designed and prepared by a low-temperature hydrothermal method via loading a trace amount of α-Fe2O3. In the experiment, the 1.5% α-Fe2O3/RP composite showed the best overall water splitting performance, which is 6.9 times that of bare RP. Through various characterization studies, the recombination rate of charges is significantly reduced. It is largely ascribed to the matched energy band structure of the two photocatalysts and the interface contact between α-Fe2O3 and RP, which efficiently separates the photocarriers through an S-scheme mode and realizes the obvious enhancement of overall water splitting performance. Moreover, α-Fe2O3/RP maintains high activity when it is persistently irradiated for 15 cycles. The research provides insight into the exploitation of low-cost, high-activity, and stable RP-based photocatalysts to achieve visible light induced overall water splitting activity to generate O2 and H2.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
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IF 7.392
Mei-Ling Xu,Jia-Ran Li,Xiu-Mei Wu,Ting Yu,Guan-Ying Qin,Fu-Ji Wang,Li-Na Zhang,Kui Li,Xin Cheng
Covalent organic frameworks (COFs) as an emerging porous material have exhibited excellent application prospects in the field of photocatalysis. Nevertheless, the overall water splitting using solar energy by COF-based photocatalysts remains a huge challenge due to the rapid charge recombination and insufficient redox catalytic capacity. Herein, for the first time, the novel Fe-MOF-derived α-Fe 2 O 3 and FeP-PC was designed and adopted as dual co-catalysts to facilitate the separation and utilization efficiency of charge carriers and activate the overall water splitting performance of the ketoenamine based TpPa-1-COF, with both the porous α-Fe 2 O 3 and FeP-PC acting as the framework supporting to effectively prevent the agglomeration of TpPa-1-COF during the fabrication and photocatalytic process. Meanwhile, the construction of Z-scheme heterostructures and the connection of covalent bonds in the interface of α-Fe 2 O 3 /TpPa-1-COF/FeP-PC effectively facilitate the separation and transport of charge. Consequently, the optimal α-Fe 2 O 3 /TpPa-1-COF/FeP-PC excites very competitive photocatalytic overall water splitting performance.
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Nanoscale Advances
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2022
·Vol. 4
·期 5
·1414-1421
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IF 5.598
Hui Zhang,Jianping Zhang,Yi Chen,Tianze Wu,Mingzhu Lu,Zhenxia Chen,Yu Jia,Yongtai Yang,Yun Ling,Yaming Zhou
The size modulation of hollow carbon nanospheres (HCSs) has attracted great interest in the contexts of cellular uptake, drug delivery and bioimaging. In this study, a facile fabrication method was specifically used to minimize all influencing factors except for the particle size. A series of nanoparticles of hollow carbon nanospheres embedded with magnetic resonance imaging (MRI) nanoagent γ-Fe2O3 and GdPO4 nanoparticles (Fe–Gd/HCS), were successfully prepared and applied to in vitro/vivo evaluation with well-defined sizes of ∼100 nm (Fe–Gd/HCS-S), ∼200 nm (Fe–Gd/HCS-M), and ∼300 nm (Fe–Gd/HCS-L), respectively. Then the in vitro size effect of Fe–Gd/HCS was systematically investigated by bio-TEM, CLSM, CCK-8 assay, and flow cytometry revealing that Fe–Gd/HCS could be internalized and the cellular uptake amounts increase with the decrease of size. Furthermore, the in vivo size-effect behavior of Fe–Gd/HCS (∼100 nm, ∼200 nm, ∼300 nm) was tracked by MRI technique, demonstrating that all Fe–Gd/HCS can distinguish the liver, in which Fe–Gd/HCS with the smallest particle size exhibited the best performance among these nanoparticles. By leveraging on these features, Fe–Gd/HCS-S (∼100 nm) was further chosen as a theranostic agent, preliminarily presenting its capability for multi-modal imaging and therapy.
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ACS Applied Materials & Interfaces
·
2021
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IF 9.229
Jiabin Shen,Shanshan Xu,Cheng Zhao,Xiaopeng Qiao,Haiquan Liu,Yong Zhao,Jing Wei,Yongheng Zhu
In this work, we present a new metal oxide semiconductor gas sensor for detecting trimethylamine (TMA) by bimetal Au@Pt-modified α-Fe2O3 hollow nanocubes (NCs) as sensing materials. The structure and morphological characteristics of Au@Pt/α-Fe2O3 were evaluated through multiple analyses, and their gas-sensitive performance was investigated. Compared with the pristine α-Fe2O3 NC sensor, the sensor based on Au@Pt/α-Fe2O3 NCs exhibited faster response time (5 s) and higher response (Ra/Rg = 32) toward 100 ppm TMA gas at a lower temperature (150 °C). Furthermore, we also assessed the Au@Pt/α-Fe2O3 NC sensor for detecting the freshness of Larimichthys crocea which have been observed by headspace solid-phase microextraction and gas chromatography–mass spectrometry. The high performance of the Au@Pt/α-Fe2O3 NCs is attributed to the special hollow morphology with a high specific surface area (212.9 m2/g) and the synergistic effect of the Au@Pt bimetal. The Au@Pt/α-Fe2O3 sensor shows promising application prospects in estimating seafood freshness on the spot.
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Small
·
2023
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IF 13.3
Wanqing Zhang,Jie Ying,Hongwei Liu
Transition metal-based catalysts possess high catalytic activity for oxygen evolution reaction (OER). However, the preparation of high-performance OER electrocatalysts using simple strategies with a low cost still faces a major challenge. Herein, this work presents an innovative, in situ-induced preparation of the Fe 2 O 3 , FeS, and NiS nanoparticles, supported on carbon blacks (CBs) (denoted as Fe 2 O 3 -Fe(Ni)S/C) as a high-efficiency oxygen evolution electrocatalyst by employing biomineralization. Biomineralization, a simple synthesis strategy, demonstrates a huge advantage in controlling the size of the Fe 2 O 3 and Fe(Ni)S nanoparticles, as well as achieving uniform nanoparticle distribution on carbon blacks. It is found that the electrocatalyst Fe 2 O 3 -Fe(Ni)S/C-200 shows a good OER electrocatalytic activity with a small loading capacity, and it has a small overpotential and Tafel slope in 1 m KOH solution with values of 264 mV and 42 mV dec −1 , respectively, at a current density of 10 mA cm −2 . Additionally, it presents good electrochemical stability for over 24 h. The remarkable and robust electrocatalytic performance of Fe 2 O 3 -Fe(Ni)S/C-200 is attributed to the synergistic effect of Fe 2 O 3 , FeS, and doped-Ni species as well as its distinct 3D spherical structure. This approach indicates the promising applications of biomineralization for the bio-preparation of functional materials and energy conversion.
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Journal of Environmental Chemical Engineering
·
2023
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IF 7.7
Jiajia Li,Yi Li,Manhua Chen,Xi Tang,Nianwen Zhu,Wenxuan Li,Qiong Mei,Shijun Yue,Yuping Tang,Qizhao Wang
The exploitation of magnetic recyclable and effective degradation photocatalysts with wide-pH-range response was essential to the practical application in the photo-Fenton process. In this study, Cd/CdS coupling with CuO/Fe 2 O 3 /CuFe 2 O 4 (CF) was employed to prepare an efficient and recyclable photocatalyst Cd/CdS-CuO/Fe 2 O 3 /CuFe 2 O 4 (CCCF). The obtained CCCF was utilized to activate H 2 O 2 for the photo-Fenton degradation of tetracycline after verifying optical properties and energy band structures. The photo-Fenton degradation performance of CCCF on tetracycline was researched in the effects of photocatalyst concentration, initial pH and H 2 O 2 volume. The photo-Fenton removal efficiency of CCCF+H 2 O 2 was capable of achieving 82.43 % under the optimal reaction condition, which was apparently higher than that of Cd/CdS and CF. The enhanced degradation efficiency could be owned to the effective carriers separation thanks to the p-n heterojunction . The development of such photocatalysts offers a new approach to degrading organic pollutants from industrial wastewater , making it a valuable tool for contaminants degradation.
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