APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Jun Wu,Ye Wang,Song Zhang,Yuxiang Liu,Feng Wang
Photocatalytic conversion of benzyl alcohol (BA) into value-added fine chemicals and hydrogen (H 2 ) in water medium provides a novel strategy for green synthesis. The construction of Z-scheme heterostructures not only realize enhanced charge-separation efficiency, but also remain strong drive force for photocatalytic reaction, which exhibit great potentials toward simultaneously generating benzaldehyde (BAD) and H 2 . Herein, we report a noble-metal-free Z-scheme photocatalytic system consisting poly(dibenzothiophene-S,S-dioxide) (PSO) and α-Fe 2 O 3 for selective oxidation of BA with synchronous H 2 production. Such nanocomposites can effectively transfer and reduce the recombination of photoexcited charge carriers, therefore maintaining the oxidizability of holes of α-Fe 2 O 3 and the reducibility of electrons of PSO. As expected, PSO-Fe 2 O 3 with a mass of ∼5 mg under optimal composition ratio exhibited an impressive photocatalytic activity with BAD and H 2 yields up to 23.1 and 29.5 μmol h −1 , respectively, which is among the top photocatalytic performance reported so far for selective photocatalytic oxidation of BA in the aqueous solution.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Jingtao Bi,Qingqing Tao,Jie Ren,Xin Huang,Ting Wang,Hongxun Hao
Heterojunction with same elements but different types of semiconductors is a special material which is convenient for fabrication and industrialization. In this work, a series of α/γ-Fe 2 O 3 isoelement heterostructures with different crystal contents (γ-Fe 2 O 3 , 10 % α-Fe 2 O 3 /90 % γ-Fe 2 O 3 , 33 % α-Fe 2 O 3 /67 % γ-Fe 2 O 3 , 55 % α-Fe 2 O 3 /45 % γ-Fe 2 O 3 , 78 % α-Fe 2 O 3 /22 % γ-Fe 2 O 3 and α-Fe 2 O 3 ) were constructed by hydrothermal method combined with controlled partial annealing process. Physicochemical analyses including XRD, TEM , XPS , BET, UV-Vis, PL spectra and ESR analyses were applied to investigate the advantages of isoelement α/γ-Fe 2 O 3 compared with the pure single-crystalline Fe 2 O 3 . Benefiting from the enlarged specific surface area and staggered band structure, the fabricated heterostructure with 78 wt% α-Fe 2 O 3 content exhibited more efficient separation of charge carriers and thus superior photodegradation efficiency than pure Fe 2 O 3 under visible-light irradiation. Different from TiO 2 -based P25 heterostructures, Fe 2 O 3 system possesses narrower bandgap and cannot efficiently consumed the excited holes. As a result, the accumulated h + would inhibit the further separation of excitons with photocatalysis proceeding and thus induce insufficient driving force for the increment of photocatalytic ability like P25. The results presented in this work would be conducive to the rational design of staggered heterostructures.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Wei Shi,Xiaojing Liu,Yulei Liu,Dong Li,Xili Tong,Jun Ma,Lu Wang
Development of robust, reactive, and inexpensive catalyst for pollutants abatement with catalytic ozonation is of great significance. Herein, the effect of a robust and easy-recovery catalyst, Fe 2 O 3 /Al 2 O 3 -SiC, for the catalytic ozonation of hardly biodegradable COD (hard COD) in coking wastewater had been explored. Al-O-Si bond formed on modified SiC through the substitution of hydrogen in surficial Si-OH groups by Al 3+ . The Lewis acid sites improved the adsorption of ozone and facilitated the formation of ·OH and O 2 · − . For coking wastewater treatment , the removal ratio of hard COD and the generation speed of hydroxyl radical (R ct ) in the catalytic ozonation process were 71% and 253% higher than those in the ozonation group, respectively. Ozone utilization increased from 0.44 g COD removed/g O 3 in the ozonation group to 1.42 g COD removed/g O 3 in the Fe 2 O 3 /Al 2 O 3 -SiC catalytic ozonation group. In a full-scale application, Fe 2 O 3 /Al 2 O 3 -SiC catalytic ozonation decreased the consumption of O 3 to 60 mg L −1 and decreased the operation cost by 50%. These results provided an approachable way for sharing the extraordinary capacity of ozone for contaminants remediation in industrial applications.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 8
·2897-2910
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IF 6.4
Mei Wu,Hongchang Wang,Xiaohui Liang,Dunhui Wang
In this work, we designed the flower-like structure of 1T/2H-MoS2@α-Fe2O3 nanocomposites with high-efficiency microwave absorption, in which the α-Fe2O3 microdrums are attached to the surface of 1T/2H-MoS2 constituting a special flower-like morphology. During the synthesis process, the content of α-Fe2O3 microdrums plays a significant, constructive role in the dielectric properties and impedance matching characteristics of the 1T/2H-MoS2@α-Fe2O3 nanocomposites. The optimal reflection loss (RL) value of the flower-like nanocomposites can reach −61.18 dB at low frequency (6.52 GHz), while the RL value is also −56.98 dB at 4.43 GHz with a lower frequency. Furthermore, the frequency bandwidth below −10 dB was up to 4.68 GHz with an effective absorption frequency range of 13.32–18 GHz when the thickness was 1.82 mm. The results show that excellent electromagnetic wave absorption capabilities of the 1T/2H-MoS2@α-Fe2O3 nanocomposites in the low frequency range mainly benefit from the perfect coordination of multiphase MoS2 and α-Fe2O3 microdrums, which makes them achieve perfect impedance matching in the low frequency range. This provides a simple demonstration for the development of highly efficient electromagnetic wave absorption materials in the low frequency range.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Fengchun Gong,Zhen Huang,Xiaolan Wei,Shule Liu,Jianfeng Lu,Jing Ding,Weilong Wang
Rapid and strong CO 2 capture is critical in CO 2 capture and utilization (CCU) techniques to mitigate global warming. Alkali molten salt (AMS) promoted-MgO sorbents with high capacity attracted attention, but their applications suffer from various limitations of low adsorption kinetics and poor stability. Here, AMS-promoted MgO sorbents corporation with Fe 2 O 3 (Mg 100-x Fe x -AMS 10 ) were fabricated via modified methanol evaporation-induced surface precipitation for use in rapid and stable CO 2 capture. Based on characterization of the sorbents, Mg 98 Fe 2 -AMS 10 showed a loose flake structure, with a large surface area and numerous exposed active sites. Therefore, Mg 98 Fe 2 -AMS 10 exhibited a strong CO 2 capacity (14.86 mmol CO2 /g sorbent at 300 °C) and good cyclic durability. Three kinetic models were explored, and the Avrami model provided a good prediction of the CO 2 adsorption behavior, with Mg 98 Fe 2 -AMS 10 exhibiting rapid adsorption kinetics. The adsorption mechanism was investigated using density functional theory (DFT) calculations. The charge transfer and bonding strengths of the surface O atoms on MgO increased, and these atoms preferentially bonded with activated CO 2 (CO 2 ∙− ) under Fe catalysis. This study may provide insights into enhancing the CO 2 capture and kinetics of MgO via combination with 3d transition metals.
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International Journal of Environmental Research and Public Health
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2022
·Vol. 19
·期 24
·16790
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IF 4.614
Mei-e Zhong,Gongsong Tong,Jingchun Sun,Nan Zhou,Chunxia Ding,Xiangying Liu,Austin Merchant,Xuguo Zhou
Biochar loading mixed–phase iron oxide shows great advantages as a promising catalyst owing to its eco–friendliness and low cost. Here, γ–Fe2O3−x@biochar (E/Fe–N–BC) composite was successfully prepared by the sol–gel method combined with low–temperature (280 °C) reduction. The Scanning Electron Microscope (SEM) result indicated that γ–Fe2O3−xparticles with the size of approximately 200 nm were well–dispersed on the surface of biochar. The CO derived from biomass pyrolysis is the main reducing component for the generation of Fe (II). The high content of Fe (II) contributed to the excellent catalytic performance of E/Fe–N–BC for quinclorac (QNC) degradation in the presence of peroxymonosulfate (PMS). The removal efficiency of 10 mg/L of QNC was 100% within 30 min using 0.3 g/L γ–Fe2O3−x@biochar catalyst and 0.8 mM PMS. The radical quenching experiments and electron paramagnetic resonance analysis confirmed that •OH and SO4•−were the main radicals during the degradation of QNC. The facile and easily mass–production of γ–Fe2O3−x@biochar with high catalytic activity make it a promising catalyst to activate PMS for the removal of organic pollutants.Keywords:low–temperature reduction;γ–Fe2O3;biochar;peroxymonosulfate;quinclorac
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ENVIRONMENTAL POLLUTION
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2023
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IF 8.9
Xiangyu Wang,Min Jiang,Iseult Lynch,Zhiling Guo,Peng Zhang,Lisi Wu,Jun Ma
Although Fe/Fe 2 O 3 has potential application compared with nanoscale zero-valent iron (nZVI), its smooth structure largely limits the catalytic performance. To address this challenge, we innovatively constructed highly efficient composite Fe/Fe 2 O 3 @UiO-66 via employing an urchin-like core-shell structure of Fe/Fe 2 O 3 onto UiO-66 through a facile ion exchange precipitation method without inert gas protection. The characterization results show the urchin-like core-shell configuration can extend the life span of Fe 0 and produce more active sites. Besides, the absorption spectrum is broadened by Fe 2 O 3 which has narrow band gap and the high-efficiency separation of photogenerated electron-hole pairs is obtained with the load of Fe/Fe 2 O 3 . Moreover, Two-parameter pseudo-first-order decay model fits well with the reduction and adsorption of composites in the dark reaction, and a plausible pathway for tetracycline (TC) degradation is also proposed. The findings of this research provide a promising method for promoting the catalytic properties of MOF-based materials and Fe/Fe 2 O 3 .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yishun Xie,Qingchuang Mu,Feiyan Lai,Guangchang Yang,Huijun Zhang,Shaorong Lu,Zheng Chen,Xiaohui Zhang,Qingyu Li
Morphology design is one effective strategy for improving the rate capability and cycling stability of Fe 2 O 3 anode material for lithium-ion batteries. Herein, a kind of dendritic Fe 2 O 3 architecture was prepared through a hydrothermal route in which glycine molecules guide crystal growth and turn into carbon in the final composite. The special coralloid Fe 2 O 3 /NC composite integrates the structure advantages of porous and low-dimensional regular electrode materials. The mutually supportive architecture provides more space to exchange ions with electrolyte and accommodate mechanical stress to suppress volume change, and improves better electron conductivity compared to isolated particles. The Fe 2 O 3 /NC delivers 837.6 mAh g −1 at 10 A g −1 and maintains 788 mAh g −1 after a long-term life of 1000 cycles. One more discovery is that the dendritic Fe 2 O 3 architecture grows into needle-like crystals driven by electrode reaction revolved to ion migration and crystal regeneration.
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Materials Today Chemistry
·
2022
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IF 7.613
Yuan Wang,Xuemei Liu,Quyun Chen,Tian C. Zhang,Like Ouyang,Shaojun Yuan
Addressing arsenite pollution in groundwater has drawn great attention. It is attractive to pre-oxidize highly mobile As(III) to relatively low-toxic As(V) with a subsequent adsorption separation process. Herein, BiOI anchoring on γ-Fe 2 O 3 is performed to synthesize BiOI/γ-Fe 2 O 3 core–shell nanoparticles for efficient removal of As(III) via a simultaneous photocatalytic oxidization–adsorption process. The physical and chemical structures of BiOI/γ-Fe 2 O 3 are investigated by transmission electron microscopy , Fourier transform infrared spectroscopy , and X-ray diffraction measurements. The photoluminescence and electron spin resonance (ESR) characterization were employed to ascertain the possible reaction mechanism of visible-light-driven photocatalytic oxidation of As(III). Such BiOI/γ-Fe 2 O 3 delivers a superior As(III) removal capability under visible light irradiation with an arsenic removal efficiency of 99.8% within 180 min, higher than those of BiOCl/γ-Fe 2 O 3 (81.7%) and BiOBr/γ-Fe 2 O 3 (98.9%). The optimal BiOI/γ-Fe 2 O 3 (molar ratio of 2:1) is obtained by rationally adjusting the molar ratio of BiOI to γ-Fe 2 O 3 . The as-synthesized BiOI/γ-Fe 2 O 3 performs well in a wide pH range of 2–8. Only coexisting PO 4 3− anions have a significant effect on the As(III) removal. The free radical trapping experiment and ESR results demonstrate that the ⋅O 2 − and h + are the main active substances for the photocatalytic oxidation of As(III) on BiOI/γ-Fe 2 O 3 . This work not only gives a novel magnetic core–shell nanoparticle photocatalyst for efficient photocatalytic oxidation and adsorption of As(III) but also offers a new strategy to rationally design BiOX for its related practical applications.
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Frontiers in Bioengineering and Biotechnology
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2022
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IF 6.064
Ni Yun,Lv Zhixiang,Wang Zhou,Kang Shouyu,He Dawei,Liu Ruijiang
Magnetic α-Fe2O3/Fe3O4 heterostructure nanosheets were fabricated via hydrothermal calcination. The activity of penicillin G acylase (PGA), which was covalently immobilized onto silica-decorated heterostructure nanosheets, achieved the highest activity of 387.03 IU/g after 18 h of incubation with 0.1 ml of PGA. In contrast, the activity of free PGA reached the highest level when the temperature was 45°C with a pH of 8.0. However, the activity of free PGA changed more dramatically than immobilized PGA as the relative conditions changed. Moreover, the Michaelis–Menten constant (Km) and reusability of immobilized PGA were also explored. The results showed that free PGA Km and maximum rate (Vmax) were 0.0274 M and 1.167 μl/min, respectively. Km and Vmax values of immobilized PGA were 0.1082 M and 1.294 μl/min, respectively. After 12 cycles of repetitive use, immobilized PGA remained approximately 66% of its initial activity, indicating that the PGA immobilized onto the heterostructure nanosheets showed better stability and reusability than free PGA.
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ACS Applied Nano Materials
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2023
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IF 5.9
Songbo Wang,Yidan Wang,Jia Li,Shuang Guo,Chengzhen Meng,Lun Pan,Ji-Jun Zou,Yawei Shi,Lei Zhang,Zhen Yin,Na Tang
In order to address the current energy and environmental challenges, photoelectrochemical (PEC) water splitting has been widely studied, and the key point about the efficient PEC process is how to develop highly active photoanode catalysts. In this article, we report a two-step hydrothermal and electrodeposition approach to prepare a cobalt (oxy)hydroxide (CoOOH)-modified Ti-Fe2O3-In2O3 electrode by synergy of electron modulation and a heterojunction structure for promoting PEC water splitting. Under a bias of 1.23 V vs RHE, the optimized Ti-Fe2O3-In2O3/CoOOH photoanode demonstrated remarkable photocurrent density and hydrogen evolution rate as high as 1.33 mA cm–2 and 22.8 μmol cm–2 h–1, which was 5.11-fold and 5.14-fold that of bare α-Fe2O3, respectively. Characterization results indicate that Ti-doping will alter the electronic structure and improve the charge carrier density, whereas the construction of a heterojunction can realize the spatial separation of charge carriers. Meanwhile, the outer CoOOH ultrathin layer can provide a large amount of oxygen evolution reaction sites and promote the surface reaction. This work suggests that the PEC performance of Fe2O3-based photoanodes can be improved effectively by the synergy of electronic modulation and heterojunction construction.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Qiang Fu,Yue Meng,Yiyang Yao,Hui Shen,Bo Xie,Zheming Ni,Shengjie Xia
A synergistic strategy of Facet engineering and the construction of Z-scheme heterojunctions is expected to improve internal consumption and insufficient carriers in photocatalysis significantly. In this paper, Fe 2 O 3 nanoparticles were selectively grown on the (110) facet of BiVO 4 , and facet orientation-supported Z-scheme heterojunction of BiVO 4 (110)-Fe 2 O 3 was constructed for the photocatalytic degradation of tetracycline . The effects of catalyst dosage, pH, temperature, and other conditions on the degradation performance were systematically investigated and found to have excellent catalytic activity , structural stability, and reusability. The removal of TC (15 mg·L −1 ) under 60 min visible light irradiation were 57.7%, 81.7%, and 91.5% for single-phase catalyst, non-directionally loaded BiVO 4 -Fe 2 O 3 and directionally loaded BiVO 4 (110)-Fe 2 O 3 Z-scheme heterojunction (0.3 g·L −1 ), respectively. Combining photoelectric testing and DFT calculation, it was confirmed that the presence of the built-in electric field from BiVO 4 (110) pointing to Fe 2 O 3 (110) in BiVO 4 (110)-Fe 2 O 3 Z-scheme heterojunction facilitates the separation and transfer of photogenerated carriers and significantly improves the photodegradation performance of the material. In addition, the intermediates and degradation pathways were investigated in detail.
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