MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Yue Zhang,Gang Li,Qiuyu Guo
A series of composites based on Fe-based MOF (Fe-BDC) and CdSe quantum dots (CdSe QDs) have been synthesized with CdSe QDs well-embedded into Fe-BDC particles, which are characterized by XRD , SEM, TEM, ICP-OES, FT-IR, N 2 physical sorption , UV–visible DRS , PL and electrochemical measurements. By detecting the degradation of Rhodamine B (RhB) in aqueous solution under visible light irradiation, the photocatalytic performance of CdSe@Fe-BDC nanocomposites were apparently improved by 5.8 times relative to single Fe-BDC, which can be attributed to the heterostructure formed in CdSe@Fe-BDC. Owing to the perfect interfacial contact, this promotes electron transfer from CdSe to Fe-BDC and significantly facilitates the separation of the photogenerated electron-hole pairs. The photocatalytic mechanism studied by adding sacrificial agents revealed that the predominant active species in the system is hole cation (h + ) and oxygen free radicals (•O 2 − ).
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yanyan Wang,Guobao Li,Youxin Hao,Yuhan Xie,Xintian Li,Changlong Chen,Anning Jiang
In recent years, the rapid economic development has significantly altered industrial production and human lifestyle, resulting in the exacerbation of water pollution. Consequently, photocatalytic technology has received considerable attention as an environmentally friendly and efficient approach for wastewater treatment. In this paper, WO 3 /SiO 2 /SnO 2 composite films were prepared by sol-gel method and subsequently co-doped with Ce, Fe and Ag ions. The photocatalytic performances of these modified composite films toward degradation of methyl green (MG) and tetracycline (TC) were systematically evaluated under UV and visible light irradiation. Comprehensive characterization techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Nitrogen adsorption desorption isotherm test, UV–vis diffuse reflectance spectroscopy (UV–vis DRS), and photoluminescence (PL) spectrascopy, were employed to investigate the crystalline phase, morphology, particle size, chemical composition, specific surface area and optical properties of the prepared composite films. The PL spectral analysis revealed that the co-doping of Ce, Fe and Ag significantly enhanced the separation efficiency of photogenerated charge carrier in the WO 3 /SiO 2 /SnO 2 composite films. Radical trapping experiments demonstrated that superoxide radicals (·O 2 - ) and hydoxyl radicals (·OH) played predominant roles in the photocatalytic degradation process. Notably, the prepared photocatalyst maintained stable performance through five consecutive recycling tests, demonstrating excellent reusability. The enhanced photocatalytic activity of the WO 3 /SiO 2 /SnO 2 -Ce/Fe/Ag composite films can be attributed to the impactful suppression of electron-hole recombination through the strategic incorporation of dopant ions.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 21
·期 1
·493-503
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IF 2.1
Wangzhe Leng,Guoxi Wan,Yanyu Liu,Rui Ma,Yi Du
The new (0.96- x )(K 0.48 Na 0.52 Nb 0.96 Sb 0.04 )O 3 -0.04(Bi 0.5 Ag 0.5 )ZrO 3 - x (Fe 2 O 3 -In 2 O 3 ) ceramics with high dielectric, and electromechanical coupling properties were designed. In this work, the effect of KNN-based ceramics lattice distortion (c/a) and microstructure on the electrical properties was explored by varying the doping amount of Fe 3+ and In 3+ . The problem of a large number of oxygen vacancies generated by the volatilization of K and Na can be well solved by introducing Fe 3+ and In 3+ . The bulk density increases significantly and the maximum value is about 4.52 g/cm 3 .The sample with x = 0.003 has the smallest c/a, and exhibits the best piezoelectric and dielectric properties ( d 33 = 536 pC/N, ε r = 3432 and k p = 55.8 %). Low doping concentration of Fe 2 O 3 is considered a “soft” addition for KNN-based piezoelectric ceramics. The study of this mechanism provides a new idea to regulate the electrical performance of KNN-based ceramics.
研究领域:
材料科学
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陶瓷工程
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固体物理
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Chen Wen,Ligang Chen,Yating Xie,Jingying Bai,Xin Liang
In order to explore the effect of Fe doped CoP nanosheets on both hydrogen evolution reaction (HER) and hydrodesulfurization (HDS), FeCoP/C nanosheets have been successfully synthesized by the solvothermal process with Fe doped ZIF-67/C for the growth of FeCo-hydroxides nanosheets , as well as a following low-temperature phosphorization process. The performance evaluation results show that the FeCoP/C nanosheet exhibits an excellent acidic HER performance and an ordinary HDS performance compared to CoP/C and FeP/C catalysts. Experimental characterization and density functional theory results show that the high HER activity of the FeCoP/C nanosheet can be attributed to the fact that the nanosheet structure facilitates the exposure of active sites and the doped Fe atoms make CoP have a suitable hydrogen adsorption energy , while the ordinary HDS activity of the FeCoP/C nanosheet can be attributed to the fact that the doped Fe atoms can inhibit the cleavage of C–S bonds by CoP.
研究领域:
材料科学
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催化
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能源材料
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化学工程
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DOI
高影响因子
Frontiers in Chemistry
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2022
·
IF 5.545
Zhou Liang,Yang Zhiyong,Wei Deju,Zhang Heng,Lu Wei
A series of composite catalysts with different Fe-based load amounts were prepared and applied to the experiment of biomass gasification assisted by steam. The structure of the catalyst was analyzed by XRD, SEM, TEM, N2 adsorption-desorption, and H2-TPR. The effect of the change of Fe load amounts on the catalytic activity was studied, and the optimal conditions of the gasification reaction were selected. The relationship between catalyst structure and catalytic capacity was clarified. The results showed that under the optimal reaction conditions, the catalyst showed better catalytic activity when Fe load amounts were 10%. The proportion of hydrogen in the gasification gas is as high as 42.2% and the hydrogen production is 27.65 g/kg. The tar content reaches the lowest value of 34.07g/Nm3.
研究领域:
能源科学
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催化化学
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
·
IF 4.598
Hui Shu,Sijia Peng,Tingrun Lai,Xiuxiu Cui,Jie Ren,Ting Chen,Xuechun Xiao,Yude Wang
The non-enzymatic glucose electrochemical sensors have great significance in the prevention and diagnosis of diabetes. In this work, Fe-CdIn 2 O 4 was grown in situ on the nickel foam with the one step non-aqueous sol-gel method. The nickel foam modified by Fe-CdIn 2 O 4 was directly used to detect glucose. The high specific surface area of the nickel foam enhances the contact surface with glucose, and effectively promotes the transmission of electrons. The 30% Fe-CdIn 2 O 4 had a good electrochemical performance for the detection of glucose when 30% Fe was combined with CdIn 2 O 4 . XRD showed that the 30% Fe-CdIn 2 O 4 had better crystallinity. SEM, SEM-Mapping, and TEM showed that the 30% Fe-CdIn 2 O 4 particles grew evenly and exposed abundant active sites. The detection results showed that the 30% Fe-CdIn 2 O 4 had an excellent response to glucose. The linear detection range was wide (0.01–1 mM), the limit detection was low (1.68 μM), the response time was rapid (2.65 s), as well as satisfactory stability, excellent selectivity, and great sensitivity (8992 μA·mM −1· cm −2 ). Meanwhile, based 30% Fe-CdIn 2 O 4 non-enzymatic electrochemical sensor was used to detect glucose in real human serum, and its detection performance was excellent. This study has practical application value in the detection of glucose in real human serum.
研究领域:
材料科学
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生物医学工程
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分析化学
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DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 35
·13260-13272
·
IF 4.052
Shaojia Song,Kun Wu,Huadong Wu,Jia Guo,Linfeng Zhang
A series of multi-shelled Fe3+/Sn4+-doped ZnO microspheres were synthesized by calcining carbon microspheres as sacrificial templates. The crystal structure, morphology and optical properties of prepared photocatalysts were investigated by X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Scanning Transmission Electron Microscopy (STEM), X-ray Photoelectron Spectroscopy (XPS), UV-Vis absorption spectroscopy (UV-Vis DRS), Photoluminescence (PL) spectroscopy and transient photocurrent techniques. FESEM and STEM images demonstrated that the samples had a multi-shelled structure and the doping elements were uniformly dispersed in the ZnO matrix. DRS and PL spectra and photocurrent measurements show that the Fe/Sn doped-ZnO samples exhibited higher visible absorption and lower recombination rates of photogenerated electron–hole (e−/h+) pairs. These advantages resulted in higher photodegradation efficiency of these catalysts towards methylene blue (MB) and ciprofloxacin (CIP). Moreover, the band structure and density of states of the un-doped ZnO and Fe/Sn-doped ZnO models with three different doping ratios were calculated based on the CASTEP code. The roles of the Fe3+/Sn4+ dopant in the ZnO matrix were found to be band gap control and electron density adjustment due to the Fe(3d) and Sn(5s, 5p) orbitals. This work has a certain reference value for constructing multi-shelled photocatalysts with doping modification and investigating the mechanism of enhanced photoactivity at the microscopic level.
研究领域:
材料科学
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理论计算化学
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环境科学
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DOI
PubMed
高影响因子
DALTON TRANSACTIONS
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2022
·Vol. 51
·期 34
·13085-13093
·
IF 4.569
Lijun Guo,Feifei Li,Jianxin Liu,Zehui Jia,Rui Li,Zhuobin Yu,Yawen Wang,Caimei Fan
The scaling relations between nitrogen adsorption and NHx destabilization are key challenges to the widespread adoption of the photocatalytic synthesis of ammonia. In this work, a FeII-rich MIL-101(Fe) (MIL-101(FeII/FeIII)) was synthesized using a one-step solvent thermal method with ethylene glycol (EG) as a reducing agent, which can break the scaling relationship by photoinduced FeII (high nitrogen adsorption ability) and FeIII (high NHz destabilization ability) cycling. XPS was used to detect the change in iron valence state in the MIL-101(FeII/FeIII) material. The photocatalytic nitrogen fixation efficiency of MIL-101(FeII/FeIII) under visible light without any sacrificial agent was 466.8 μmol h−1 g−1, five times that of MIL-101(Fe). After photocatalytic experiments, MIL-101(FeII/FeIII) retained an unchanged FeII/FeIII rate, indicating that this FeII/FeIII cycling can be maintained. DFT modeling of the FeII-rich MOF material showed that a FeII1 FeIII2 system has a higher N2 activation capacity than a FeIII3 system. The catalytic mechanism was further proved by in situ infrared spectra and N15 isotopic tracers. Therefore, the improvement of photocatalytic activity was mainly attributed to the change in the nitrogen adsorption capacity during the photoinduced FeII/FeIII cycling.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
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IF 5.31
Binbin Shao,Yufan Chen,Deli Wu,Chaomeng Dai,Yalei Zhang
Structural Fe(II/III) hydroxides on the shell of nano-zerovalent iron (nZVI) are reactive sites for As(III) adsorption. Well-controlled structural Fe(II) hydroxides (SFH) is prepared to serve for As(III) removal in present study. With oxygen As(III) removal by SFH occurred efficiently but the removal efficiency was greatly reduced under anoxic conditions. The mineral transformation from SFH to lepidocrocite probably contributed to the robust removal efficiency of As(III). It is found that Cu(II), Cr(VI) and NO 2 − in aqueous solution could act as oxidants and promote the mineral transformation of SFH. A more efficient As(III) removal was therefore observed without oxygen. The removal efficiency decreased in the order O 2 /SFH ≈ Cu(II)/SFH > Cr(VI)/SFH ≈ NO 2 − /SFH at near neutral pH. The removal efficiency was less dependent on the initial pH for O 2 /SFH and Cu(II)/SFH systems than Cr(VI)/SFH and NO 2 − /SFH systems. Distribution of As on solid phases was able to describe the removal mechanism of As(III), and the results showed that the mineral transformation promoted the precipitation process and inhibited outer-sphere complexation, thus leading to enhanced As removal. With Cu(II), Cr(VI) and NO 2 − , the generation of oxidants from SFH transformation drove As(III) oxidation, and contributed to total As removal.
研究领域:
环境科学
·
化学
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DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 23
·4138
·
IF 5.719
Weihua Qin,Yueming Ma,Ting He,Jingbin Hu,Pan Gao,Shaoxia Yang
A heterogeneous Fenton-like catalyst with single redox site has a rate-limiting step in oxidant activation, which limited its application in wastewater purification. To overcome this, a bimetallic doping strategy was designed to prepare a heterogeneous Fenton-like catalyst (Fe-Mo/rGO) with a double-reaction center. Combined with electrochemical impedance spectroscopy and density functional theory calculation, it was confirmed that the formation of an electron-rich Mo center and an electron-deficient Fe center through the constructed Fe-O-Mo and Mo-S-C bonding bridges induced a higher electron transfer capability in the Fe-Mo/rGO catalyst. The designed Fe-Mo/rGO catalyst exhibited excellent sulfamethazine (SMT) degradation efficiency in a broad pH range (4.8–8.4). The catalytic performance was hardly affected by inorganic anions (Cl−, SO42−and HCO3−) in the complicated and variable water environment. Compared to Fe/rGO and Mo/rGO catalysts, the SMT degradation efficiency increased by about 14.6 and 1.6 times in heterogeneous Fenton-like reaction over Fe-Mo/rGO catalyst. The electron spin resonance and radical scavenger experiments proved that ·O2−/HO2· and1O2dominate the SMT removal in the Fe-Mo/rGO/H2O2system. Fe and Mo, as active centers co-supported on rGO, significantly enhanced the electron transfer between catalyst, oxidant, and pollutants, which accelerated the reactive oxygen species generation and effectively improved the SMT degradation. Our findings offer a novel perspective to enhance the performance of heterogeneous Fenton-like catalysts by accelerating the electron transfer rate in the degradation of organic pollutants.Keywords:heterogeneous Fenton-like reaction;Fe-Mo dual-reaction-center catalyst;reactive oxygen species;sulfamethazine
研究领域:
环境科学
·
催化化学
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DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 14
·8055-8065
·
IF 3.119
Wenpeng Han,Shanmin Wang,Xuekuan Li,Ben Ma,Mingxian Du,Ligong Zhou,Ying Yang,Ye Zhang,Hui Ge
The effect of Fe, Co and Ni promoters on supported MoS2 catalysts for hydrogenation of nitroarenes were systematically investigated via experiment, characterization and DFT calculation. It was found that the addition of promoters remarkably improved the reaction activity in a sequence of Ni > Co > Fe > Mo. Meanwhile Ni promoted catalyst with the best performance showed good recyclability and chemoselectivity for a wide substrate scope. The characterization results revealed that the addition of promoters decreased the interaction between Mo and support and facilitated the reductive sulfidation of Mo species to produce more coordinated unsaturated sites (CUS). DFT calculations showed that the addition of promoters increased the formation of CUS, and enhanced the adsorption of hydrogen. The influence degree of promoters followed the sequence Ni > Co > Fe > Mo, which was consistent with those of the activities. Nitrobenzene hydrogenation and hydrogen activation occurred at the S and Mo edge, respectively. The adsorbed hydrogen diffused from the Mo edge to the S edge to participate in the hydrogenation reaction. Mechanism investigation showed that the main reason for increased activity by the addition of promoters was the increase of amounts of CUS and the secondary reason was the augmentation of intrinsic activity of CUS. The present studies give a new understanding for promoter modified MoS2 catalysts applied for hydrogenation of nitroarenes.
研究领域:
催化化学
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材料科学
·
理论化学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Lei He,Yanan Dong,Yane Zheng,Qingming Jia,Shaoyun Shan,Yaqin Zhang
A novel magnetic MIL-101(Fe)/TiO 2 composite was synthesized for photo degradation of tetracycline (TC) under solar light. The composite was characterized by XRD, TGA, SEM, TEM, EDS, BET, FTIR, XPS, VSM, ESR, and PL. The resultant composite was environment friendly material, which exhibited high TC degradation efficiency and excellent reusability. In the meantime, it could be separated easily from TC solution by using magnet, which would save significant time and cost of preparation and degradation, having broad prospect in application. Using 1 g L −1 magnetic MIL-101(Fe)/TiO 2 at pH = 7, 92.76% degradation efficiency was achieved under solar light irradiation in 10 min for 20 mg L −1 TC. Further experiments indicated that TiO 2 introduced in the composite played an important role in the degradation process, which could be activated by the UV light in solar light to generate large amount of O 2 − and OH radicals. The degradation efficiency of TC in this paper was significantly higher than other research papers reported in last three years. This study put forward new magnetic Fe-based metal-organic frameworks (MOFs)/TiO 2 composite for degrading pharmaceutical wastewater.
研究领域:
环境科学
·
材料化学
·
光催化
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水处理
·
纳米材料
·
药物降解
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）