CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Yan Huang,Li-chao Nengzi,Xinyi Zhang,Jianfeng Gou,Yingjie Gao,Guixian Zhu,Qingfeng Cheng,Xiuwen Cheng
In the study, CuS/Fe 2 O 3 /Mn 2 O 3 magnetic nanocomposite was successfully synthesized and the properties were investigated via a series of characterization. Subsequently, the magnetic nanocomposite was applied to activate peroxymonosulfate (PMS) for ciprofloxacin (CIP) degradation. The results showed that the CuS/Fe 2 O 3 /Mn 2 O 3 magnetic nanocomposite possessed higher catalytic performance for ciprofloxacin degradation than bare CuS and Fe 2 O 3 /Mn 2 O 3 composite. The degradation process of CIP was suitable for the pseudo-first-order kinetic model and the highest rate was reached 0.10083 min −1 . And under the optimized conditions (catalyst = 0.6 g·L −1 , PMS = 0.6 g·L −1 , pH = 5.84, C 0 = 0.2 g·L −1 and t = 120 min), the efficiency of 88% and 48.6% were corresponding to degradation and mineralization of ciprofloxacin, respectively. In addition, the key factors of degradation process such as catalyst dosage, PMS concentration, initial pH value and common anions were investigated. And the results indicated that the degradation efficiency of ciprofloxacin was reduced, which affected by the common anions in order of Cl − > SO 4 2− > NO 3 − > HCO 3 − > Humic acid. Besides, several intermediates of ciprofloxacin were detected and the plausible degradation pathways were proposed. In addition, the underlying reaction mechanism was proposed. Meanwhile, the results of free radical quenching experiment and electron paramagnetic resonance (EPR) spectra indicated that both OH and SO 4 − radicals were existed in the reaction system and the OH radicals had a conquer role in the degradation progress. Moreover, the stability and reusability of CuS/Fe 2 O 3 /Mn 2 O 3 magnetic nanocomposite were evaluated, which the degradation efficiency still reached 72% after five times used. Ultimately, the as-constructed CuS/Fe 2 O 3 /Mn 2 O 3 magnetic nanocomposite might be a candidate to the removal of refractory pollutants in environmental remediation.
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Nanomaterials
·
2020
·Vol. 10
·期 9
·1701
·
IF 4.324
Ruowen Liang,Zhoujun He,Chen Zhou,Guiyang Yan,Ling Wu
In this work, CdS quantum dots (QDs) were planted on magnetically recyclable porous Fe2O3(denoted as F450) to obtain CdS QDs/porous Fe2O3hybrids (denoted as X–CdS/F450, in which X is the immersion times of CdS QDs). Porous Fe2O3was first obtained by pyrolysis from an iron-containing metal–organic framework by a two-step calcination method. Next, CdS QDs (of average size 3.0 nm) were uniformly and closely attached to the porous F450 via a sequential chemical-bath deposition strategy. As expected, the X–CdS/F450 hybrids serve as high-performance photocatalysts for the degradation of bisphenol A, a typical endocrine-disrupting chemical. Almost ∼100% of the bisphenol A was degraded over 5-CdS/F450 after visible light irradiation for 30 min (λ ≥ 420 nm). In comparison, the degradation efficiency of pure F450 powder is 59.2%. The high performance of 5-CdS/F450 may be ascribable to the fast electron transport of porous F450, the intense visible-light absorption of the CdS QDs and the matched energy levels between CdS and F450. More significantly, through the photocatalytic degradation reaction, the X–CdS/F450 hybrids can easily be recovered magnetically and reused in subsequent cycles, indicating their stability and recyclability.Keywords:MIL-100(Fe);self-sacrificed template;bisphenol A;photocatalyst;mechanism
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Xiaojun Guo,Yanan Xu,Fei Zha,Xiaohua Tang,Haifeng Tian
Hematite (α-Fe 2 O 3 ), as one of Fenton reagents, is widely investigated for the treatment of wastewater in the field of advanced oxidation processes (AOPs). Considering the fast charge carrier recombination of hematite (α-Fe 2 O 3 ), we have successfully synthesized a novel and high active heterogeneous Fenton catalyst α-Fe 2 O 3 /Cu 2 O(SO 4 ) for the degradation of organic pollutants. The results show that the as-obtained Cu 2 O(SO 4 )-Fe9 composite exhibits excellent degradation properties of Orange II. 98.9% degradation rate was achieved for 100 mL of 50 mg/L Orange II solution in the condition of 0.3 g/L Cu 2 O(SO 4 )-Fe9 catalyst, 3 mM H 2 O 2 and pH = 3.5. The degradation rate constants of Cu 2 O(SO 4 )-Fe9 in the photo-Fenton-like system are 9.33 and 4.07 times of Cu 2 O(SO 4 ) and α-Fe 2 O 3 , respectively. In addition, the mechanism and pathway for the degradation of Orange II were proposed. The scheme of combining copper-based oxysulfate Cu 2 O(SO 4 ) with hematite (α-Fe 2 O 3 ) could improve the efficiency of charge carrier separation, which will further enhance the catalytic activity and expand its application in water purification.
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RSC Advances
·
2020
·Vol. 10
·期 15
·8773-8779
·
IF 3.119
Meng Yuan,Fangrong Yan,Yige Chen,Jujie Luo,Ziyan Li
A three-dimensional particle electrode loaded with α-Fe2O3 on powdered activated carbon (PAC) (α-Fe2O3/PAC) was synthesized by the microwave method for removing ammonium nitrogen from wastewater in a three-dimensional electrode system. The α-Fe2O3/PAC electrode was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The effect of the added α-Fe2O3/PAC on the removal of ammonium nitrogen from simulated wastewater was studied by changing the cell voltage, particle dosage, and particle electrode synthesis conditions. Simulated experiments were also carried out on different pollutants under the best experimental conditions and the actual domestic sewage was tested. The results show that the optimal synthesis conditions of the particle electrode are as follows: the ratio of PAC to anhydrous FeCl3 is 1 : 2, and the microwave power is 1000 W for 60 s. After 20 min of electrolysis at 20 V, the ammonium nitrogen removal rate can reach 95.30%.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
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IF 4.65
Mengying Sun,Yu Lei,Hao Cheng,Jianfeng Ma,Yong Qin,Yong Kong,Sridhar Komarneni
Mg doped CuO–Fe 2 O 3 composites were hydrothermally synthesized and characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy . Mg doping improved the catalytic performance of CuO–Fe 2 O 3 for phenol degradation as the removal efficiency of phenol (33 mg/L) reached up to 84.36% within 45 min using 3.2% Mg doped CuO–Fe 2 O 3 when coupled with persulfate (PS) system. The results revealed that Mg doping generated more defects (oxygen vacancies), which result in the generation of more active species during the degradation process. The influence of catalysts and PS dosages were investigated to obtain the optimum conditions. The effects of pH and dissolved oxygen were also evaluated. Increase of solution pH was found to be beneficial for the removal of phenol because of reduced copper leaching at higher pH. However, decrease in dissolved oxygen concentration retarded the degradation of phenol because of the reduced production of O 2 • - . Based on the quenching experiments and ESR experiments, 1 O 2 , O 2 • - , ·OH and ·SO 4 − were confirmed as the active species in the phenol degradation process and a phenol degradation pathway was proposed. Other contaminants such as nitrobenzene (NB), P-nitrophenol (PNP) and P-Chlorophenol (4-CP) could also be removed to some extent using the present catalyst system.
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CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Jianxia Zhang,Li Liu,Chao Sun,Xiaosong Li,Bing Zhao,Xiangnan Ju,Chunxia Tian,Dan Sun,Guijun Nian
The 3D layered α-Fe 2 O 3 microflowers assembled by pure and Sr-doped nanosheets were prepared by hydrothermal and annealing methods. SEM morphological characterization results show that after the introduction of Sr, the microflowers are assembled from more layered nanosheets. XPS indicates that the material can provide more surface oxygen vacancy defects and oxygen adsorption sites, which is beneficial to the improvement of gas sensitivity. The response of 3 wt% Sr-doped α-Fe 2 O 3 with alkaline earth metal element Sr to 100 ppm ethanol (82.1) is 2.37 times that of pure α-Fe 2 O 3 (34.5) to ethanol at low temperature (220 °C).
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Hongjie Zhu,Zhihao Chen,Youyou Hu,Lingxuan Gong,Dandan Li,Zhengkui Li
The Z-scheme photocatalyst is valuable for use in polluted water purification. To improve the practical application value of the Z-scheme, in this study, a nano α-Fe 2 O 3 and P3HT composite photocatalyst array was synthesized by electrophoretic deposition for the first time. This material was named F1P. The EPR, VBXPS and in situ illumination XPS analyses indicated that the charge transfer path of F1P conforms to the Z-scheme, and F1P array has a high light energy conversion efficiency. Due to the advantages of the Z-scheme system and the good light harvesting ability, F1P exhibited a good degradation effect on different types of pollutants under visible light irradiation. The degradation efficiency of tetracycline and bisphenol A by F1P can reach 97 % and 99 %, respectively. Moreover, F1P showed a certain resistance to water quality changes. After four cycles, F1P can maintain the structural stability and good pollutant treatment effect. Due to the high redox ability of F1P, the complex structure of pollutants can be destroyed and the degradation path of pollutants in F1P system was also analyzed. This study provides a new way of synthesizing Z-scheme systems and immobilizing Z-scheme photocatalysts. F1P is a new material with high practicability.
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Nanomaterials
·
2020
·Vol. 10
·期 7
·1345
·
IF 4.324
Qingqing Tao,Xin Huang,Jingtao Bi,Rongli Wei,Chuang Xie,Yongzhu Zhou,Lu Yu,Hongxun Hao,Jingkang Wang
In this work, Fe2O3@TiO2nanostructures with staggered band alignment were newly designed by an aerobic oil-phase cyclic magnetic adsorption method. XRD and TEM analyses were performed to verify the uniform deposition of Fe2O3nanoparticles on the nanotube inner walls of TiO2. The steady-state degradation experiments exhibited that 1FeTi possessed the most superior performance, which might be ascribable to the satisfying dark adsorption capacity, efficient photocatalytic activity, ease of magnetic separation, and economic efficiency. These results indicated that the deposition of Fe2O3into TiO2nanotubes significantly enhanced the activity of Fe2O3, which was mainly ascribed to the Fe2O3-induced formation of staggered iron oxides@TiO2band alignment and thus efficient separation of h+and e−. Furthermore, the PL intensity and lifetime of the decay curve were considered as key criterions for the activity’s evaluation. Finally, the leaching tests and regeneration experiments were also performed, which illustrated the inhibited photodissolution compared with TiO2/Fe3O4and stable cycling ability, enabling 1FeTi to be a promising magnetic material for photocatalytic water remediation.Keywords:1D nanostructures;TiO2nanotubes;iron oxides;visible-light photocatalysis
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Yue Sun,Simeng Shao,Yanfeng Wang,Wenjuan Lu,Pingping Zhang,Qingqiang Yao
For the first time, g-C 3 N 4 @α-Fe 2 O 3 /Co-Pi heterojunctional hollow spheres were successfully fabricated via thermal condensation method followed by solvothermal and photo-deposition treatment, which showed excellent photocatalytical property. Except for the Z-scheme charge transfer between α-Fe 2 O 3 and g-C 3 N 4 , the Co-Pi could further reduce the combination of photogenerated electrons and holes as a hole storage agent, resulting in remarkably enhanced visible-light photocatalytic water splitting activity with the H 2 production rate of 450 μmol h −1 g −1 , which is 15.7 times higher than that of g-C 3 N 4 . Moreover, the photocatalytic activity of the prepared ternary hollow photocatalysts showed almost no significant weakness after five cycles, which indicated their good performance stability. The as-prepared g-C 3 N 4 @α-Fe 2 O 3 /Co-Pi also possessed good activity for overall water splitting with the hydrogen production rate reaching 9.8 μmol h −1 g −1 . This synthesized g-C 3 N 4 @α-Fe 2 O 3 /Co-Pi composite is expected to be a promising candidate for water splitting.
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FUEL
·
2023
·
IF 7.4
Jiangtao Meng,Jing Wang,Fengling Yang,Fangqin Cheng
The multiple influence mechanisms of Fe 2 O 3 on nitrogen evolution during sewage sludge pyrolysis were systematically investigated by correlating temperatures. The results showed that Fe 2 O 3 promoted the pyrolysis of the sludge. The activation energy of the pyrolysis was reduced by 12–110 kJ/mol. Fe 2 O 3 acted oxidatively on sludge nitrogen in the following order Fe 2 O 3 →Fe 3 O 4 ( ca. 528 K)→Fe x N y ( ca. 763 K)→Fe x C ( ca. 1023 K). The oxidation target of Fe 2 O 3 on nitrogen containing compounds varied as a function of temperature. At temperatures of 528 K and 623 K, Fe 2 O 3 hindered the deamination of proteins in char to NH 3 , facilitated the condensation of pyridines to nitrile, and impeded the generation of HCN. At temperatures of 763 K and 1023 K, Fe 2 O 3 facilitated the cleavage of amines, heterocycles, and nitrile in char. Additionally, it promoted the breaking of chains and cyclization of long chain amines in tar. This process theoretically leads to the production of a great amount of NH 3 and HCN at the front. Overall, Fe 2 O 3 inhibited the release of NOx precursors through inhibition of deamination, fixation of nitrogen in char and consumption of NH 3 and HCN. This study will establish the effect mechanism of action of Fe 2 O 3 on the nitrogen conversion of sewage sludge pyrolysis at relevant temperatures. It will provide a theoretical foundation for controlling NOx and the targeted regulation NH 3 (carbon-free hydrogen energy carriers) in the high-value conversion of nitrogen-rich biomass.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Liu Yang,Jing Li,Guoqiang Cao,Yiyan Yang,Wen Luo,Zhiqi Zhang,Lizhi Feng,Xinglai Zhang,Baodan Liu
This study reports on the development of highly-efficient Pt/CuO-Fe 2 O 3 /TiO 2 monolithic catalysts for the low-temperature conversion of NO to N 2 via CO-SCR. In this case, ultrathin TiO 2 nanosheet arrays are designed to in situ grow on flexible Ti mesh to provide more spaces/areas for the loading of highly-dispersed Fe 2 O 3 and CuO active components. Furthermore, Pt nanoparticles with an average size of 1.30 nm are effectively decorated on the surface of CuO-Fe 2 O 3 /TiO 2 . The H 2 -TPR and NO-TPD results demonstrate that the excellent synergistic effect between TiO 2 , CuO, Fe 2 O 3 and trace amounts of Pt is conducive to enhance the adsorption of NO and finally promote the CO-SCR. The obtained Pt/CuO-Fe 2 O 3 /TiO 2 catalysts exhibit excellent CO-SCR performance with 100 % NO conversion, and 100 % N 2 selectivity at 250 °C, showing great potential of de-NO x application by using toxic CO as reductant in industry.
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Materials
·
2023
·Vol. 16
·期 5
·1945
·
IF 3.4
Yuan Chen,Feihong Liu,Yufei Zhao,Mengdie Ding,Juan Wang,Xuan Zheng,Huihu Wang,Marie-Christine Record,Pascal Boulet
In this study, lychee-like TiO2@Fe2O3microspheres with a core-shell structure have been prepared by coating Fe2O3on the surface of TiO2mesoporous microspheres using the homogeneous precipitation method. The structural and micromorphological characterization of TiO2@Fe2O3microspheres has been carried out using XRD, FE-SEM, and Raman, and the results show that hematite Fe2O3particles (7.05% of the total mass) are uniformly coated on the surface of anatase TiO2microspheres, and the specific surface area of this material is 14.72 m2g−1. The electrochemical performance test results show that after 200 cycles at 0.2 C current density, the specific capacity of TiO2@Fe2O3anode material increases by 219.3% compared with anatase TiO2, reaching 591.5 mAh g−1; after 500 cycles at 2 C current density, the discharge specific capacity of TiO2@Fe2O3reaches 273.1 mAh g−1, and its discharge specific capacity, cycle stability, and multiplicity performance are superior to those of commercial graphite. In comparison with anatase TiO2and hematite Fe2O3, TiO2@Fe2O3has higher conductivity and lithium-ion diffusion rate, thereby enhancing its rate performance. The electron density of states (DOS) of TiO2@Fe2O3shows its metallic nature by DFT calculations, revealing the essential reason for the high electronic conductivity of TiO2@Fe2O3. This study presents a novel strategy for identifying suitable anode materials for commercial lithium-ion batteries.Keywords:lithium-ion batteries;anode materials;TiO2@Fe2O3microspheres;electrochemical properties;first-principles calculations
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