COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Jiahui Deng,Yalin Cheng,Min Liu,Biyang Tu,Shan Xue,Haisheng Tao
In this study, Fe-Mn co-embed sodium alginate carbon spheres (Fe-Mn/SA-C) were prepared as a cost-effective adsorbent for aqueous Cd(II) removal by a facile pyrolysis method. The morphology and chemical composition of Fe-Mn/SA-C were explored with various characterized techniques. The results indicate that Fe-Mn/SA-C possess porous structures and abundant oxide-based functional groups. Fe-Mn/SA-C exhibits excellent adsorption properties for aqueous Cd(II) and the adsorption process is pH-dependent. The adsorption data could fit pseudo second-order and Langmuir models well, suggesting that chemisorption is a dominant adsorption mechanism and the maximum adsorption capacity is 280.11 mg −1 . Thermodynamic analysis demonstrates that the adsorption is spontaneous and endothermic. The adsorption mechanisms of Cd(II) include the complexation of Cd(II) with oxygen-based functional groups, precipitation, and ion exchange. Finally, the granulated and magnetic Fe-Mn/SA-C is an efficient and practical adsorbent for cadmium-containing wastewater treatment.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Nan Zhao,Kunyuan Liu,Bofang Yan,Ling Zhu,Chuanfang Zhao,Jia Gao,Jujun Ruan,Weihua Zhang,Rongliang Qiu
In the last years, the synthesis and applications of biochar/Fe composites have been extensively studied, but only few papers have systematically evaluated their removal performances. Herein, we successfully synthesized and structurally characterized Fe 0 , Fe 3 C, and Fe 3 O 4 -coated biochars (BCs) for the removal of chlortetracycline hydrochloride (CH). Evaluation of their removal rate and affinity revealed that Fe 0 @BC could achieve better and faster CH removal and degradation than Fe 3 C@BC and Fe 3 O 4 @BC. The removal rate was controlled by the O–Fe content and solution pH after the reaction. The CH adsorption occurred on the O C groups of Fe 0 @BC and the O C and O Fe groups of Fe 3 C@BC and Fe 3 O 4 @BC. Electron paramagnetic resonance analysis and radical quenching experiments indicated that HO and 1 O 2 / O 2 − were mainly responsible for CH degradation by biochar/Fe composites. Additional parameters, such as effects of initial concentrations and coexisting anions, regeneration capacity, cost and actual wastewater treatment were also explored. Principal component analysis was applied for a comprehensive and quantitative assessment of the three materials, indicating Fe 0 @BC is the most beneficial functional material for CH removal.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Jiahao Yu,Jieyi Yu,Tongpan Ying,Xianguo Liu,Xuefeng Zhang,Dandan Han
Three main strategies for designing efficient microwave absorber includes the intrinsic dielectric/magnetic properties, the novel structure and the single atom doping. The Fe-N/C nanocomposites integrate the advantages of above three strategies into one system. In this work, the method for preparing Fe-N/C nanocomposite by calcining the FePc@ZIF-8 precursor under a flowing N 2 gas is described. Fe-N/C nanocomposites, displaying respectable dodecahedron-like morphology, have the merits of strong absorption ability, wide effective absorption bandwidth, thin thickness, and excellent microwave absorption efficiency, which are attributed to the synergistic effect of good electromagnetic loss capacity and proper impedance matching originating from intrinsic dielectric/magnetic properties, the novel structure and the single atoms (Fe and N) doping. Fe-N/C-24 composite delivers an optimal reflection loss of −30.98 dB, an effective absorption bandwidth of 5.04 GHz, the microwave absorption capacity of 87.61 dB GHz the absorption efficiency of 51.53 dB GHz/mm at 1.7 mm.
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ACS Applied Materials & Interfaces
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2023
·
IF 9.5
Xiumin Yang,Sijia Lv,Liyong Gan,Chun Wang,Zhi Wang,Zhonghai Zhang
A single-atom catalyst (Fe SAs/–N-C) with excellent stability and conductivity was strategically fabricated via high-temperature calcination using the NiFe layered double hydroxide (LDH)/ZIF-8 composite as precursors. With the help of Ni as a catalyst, a great number of carbon nanotubes were produced whereby the isolated carbon bulks were interconnected to form an “island-bridge”-like 3D network structure, which greatly enhanced the exposure of active sites and the electron transfer. Accordingly, caffeic acid (CA) with versatile biological and pharmacological activities was chosen as the model analyte. The Fe SAs/–N-C with Fe–N4 as the catalytic active site was employed to establish the electrochemical sensing of CA with satisfactory sensitivity, selectivity, and long-term stability. This work expands the application range of single-atom catalysts and contributes a significant reference for the synthesis of hybrid double-atom catalysts.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xingxing Huang,Yingzhang Shi,Cheng Liu,Zhiwen Wang,Jinhong Bi,Jimmy C. Yu,Ling Wu
A series of Cu 2 O clusters/MIL-100(Fe) heterojunctions with different Cu 2 O mass ratios were constructed as the photocatalysts for N 2 fixation. An optimal nitrogen fixation performance of 51.22 μmol·g −1 ·h −1 is achieved when the mass fraction of Cu 2 O is 20 %. Isotope analysis experiments confirmed that the nitrogen source is N 2 . Possible intermediate signals during photocatalytic reactions were detected by in situ DRIFTS. XPS results further confirm the formation of Cu 2 O/MIL-100(Fe) heterojunctions, and that the existence of Cu–O surface interactions is the key to efficient electron transfer. It is revealed that the improvement of the catalytic performance is derived from the formation of heterojunction which regulates the energy band structure as well as promotes the separation of photogenerated electron-hole pairs. This study proposes a possible mechanism of photocatalytic nitrogen fixation and emphasizes the role of surface interaction and electron transfer in type-II heterojunction in improving nitrogen fixation performance.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Ziyuan Xiu,Feng Wei,Xin Zhou,Xiaojun Han
Achieving high ammonia yield and Faraday efficiency is a long-sought-after goal in electrochemical N 2 fixation. Yet, the competitive hydrogen evolution in nitrogen reduction process and the low local concentration of nitrogen on the working electrode still limited the electrocatalytic performance. In the present contribution, a Fe-MoSe 2 nanosheet functioned with C18-thiol as a nano-hydrophobic surface was rationally constructed, which efficiently facilitated the three-phase contact of gas (N 2 ), liquid (H 2 O electrolyte), and solid (electrocatalyst). The fabrication of modified hydrophobic surface not only overcame the mass transfer limitation of N 2 and increased the local concentration of N 2 molecules on the catalyst, but also reduced the proton contact with electrocatalyst to inhibit HER. The three-phase electrocatalytic system achieved a high NH 3 yield of 34.75 μg h −1 mg −1 and outstanding Faraday efficiency of 23.31%. The adsorption and activation processes during NRR process were systematically investigated by the combination of experimental results and density function theory (DFT) simulations.
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COMBUSTION AND FLAME
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2023
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IF 4.4
Erhai An,Yihong Tan,Kehua Han,Xiaoxia Li,Xiong Cao,Yingxin Tan,Peng Deng
Molecular perovskite energetic material DAP-4 is seen as a potential high-energy oxidant due to its high energy, high density, high oxidation capacity, and facile preparation technology. However, optimizing its energy release and reducing its thermal decomposition temperature are huge challenges for its future application. In this work, the role of iron (Fe) nanospheres in the energy release of DAP-4 was studied. Our research has shown that Fe powder can not only serve as a fuel to promote combustion, but also as an important catalyst to significantly improve the thermal decomposition, energy release, and burning rate of DAP-4. By adding 25% Fe nanospheres, the decomposition temperature of DAP-4 was reduced to 299.7 °C, which is the most reduction by 84.7 °C from 384.4 °C (raw DAP-4) to 299.7 °C (DAP-4/Fe-5 with 25wt% Fe nanospheres) was obtained. The decomposition activation energy also decreases by at least 69.5 kJ mol −1 from 229.4 kJ mol −1 (DAP-4) to 159.9 kJ mol −1 (DAP-4/Fe-1 with 5wt% Fe nanospheres). The combustion performance of DAP-4/Fe composites is significantly improved by a 4∼5 times shorter burn rate. The energy-releasing mechanism of DAP-4 with the presence of Fe nanospheres was proposed. Fe x O y at the surface of Fe nanospheres played an important role in the energy releasing of DAP-4. This work showed a new idea for the potential application of molecular perovskite energetic materials.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Hailong Liao,Heping Xie,Shuo Zhai,Ling Fu,Yuan Zhang,Senran Hao,Bin Chen,Chuanxin He,Zongping Shao
Aqueous Zn-CO 2 batteries are a new technology for reducing carbon dioxide emissions and converting CO 2 into valuable products. The development of high-performance catalysts is crucial for improving the efficiency of the CO 2 reduction reaction(CO 2 RR) in these batteries. The technical challenges of CO 2 RR catalysts include high cost, complicated synthesis and low Faraday efficiency. In this study, we developed an efficient and cost-effective CO 2 RR perovskite catalyst, by partially substituting Fe to the B site of precious metal-free La 0.5 Sr 0.5 MnO 3 (LSM) perovskite. Comprehensive investigation into the Structure, morphology, coordination information and electrochemical performance of pristine La 0.5 Sr 0.5 MnO 3 (LSM) and substituted La 0.5 Sr 0.5 Fe 0.6 MnO 3 (LSF 0.6 M) catalysts were conducted, LSF 0.6 M catalyst shows enhanced electrochemical performance, Faraday efficiency, battery durability and battery power density than LSM. Specifically, the Fe-doped catalyst shows a significant improvement in CO 2 reduction reaction (CO 2 RR) performance, with an 80% increase in current density, an 82% Faraday efficiency, and a 50% increase in power density of Zn-CO 2 battery. Characterization experimental results and DFT calculation reveal that Fe substitution can increase the perovskite lattice size to favor CO 2 absorption and *COOH formation, thus the improved CO yields. These analyses provided insights into the underlying mechanisms of the catalyst's performance in CO 2 RR within the battery system. These results highlight LSF 0.6 M perovskite as a very promising CO 2 RR electrocatalyst for Zn-CO 2 battery.
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TRANSACTIONS OF TIANJIN UNIVERSITY
·
2023
·Vol. 29
·期 4
·293-303
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IF 7.1
Liu Shengkun,Zhao Qiao,Han Xiaoxue,Wei Chongyang,Liang Haoting,Wang Yidan,Huang Shouying,Ma Xinbin
The interaction between a promoter and an active metal crucially impacts catalytic performance. Nowadays, the influence of promoter contents and species has been intensively considered. In this study, we investigate the effect of the iron (Fe)–zinc (Zn) proximity of Fe–Zn bimetallic catalysts on CO 2 hydrogenation performance. To eliminate the size effect, Fe 2 O 3 and ZnO nanoparticles with uniform size are first prepared by the thermal decomposition method. By changing the loading sequence or mixing method, a series of Fe–Zn bimetallic catalysts with different Fe–Zn distances are obtained. Combined with a series of characterization techniques and catalytic performances, Fe–Zn bimetallic proximity for compositions of Fe species is discussed. Furthermore, we observe that a smaller Fe–Zn distance inhibits the reduction and carburization of the Fe species and facilitates the oxidation of carbides. Appropriate proximity of Fe and Zn (i.e., Fe 1 Zn 1 -imp and Fe 1 Zn 1 -mix samples) results in a suitable ratio of the Fe 5 C 2 and Fe 3 O 4 phases, simultaneously promoting the reverse water–gas shift and Fischer–Tropsch synthesis reactions. This study provides insight into the proximity effect of bimetallic catalysts on CO 2 hydrogenation performance. Graphical Abstract
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ANALYST
·
2023
·Vol. 148
·期 8
·1838-1847
·
IF 4.2
Zhidong Zhao,Yuan He,Xingrui Qi,Nian Li,Zijian He,Yufang Chen,Tao Jin
Electrochemical determination of synthetic opioids such as fentanyl is meaningful but still challenging no matter from a social or academic perspective. Herein, we report a series of novel electrocatalysts based on Fe-containing metal–organic frameworks and multi-walled carbon nanotubes (Fe-MOF/MWCNTs). The obtained Fe-MOF/MWCNT electrode materials all show ultrasensitivity on fentanyl determination. In particular, MOF-235/MWCNTs even exhibit an ultra-low limit of detection (LOD) of 0.03 μM with a wide linear range from 0.1 to 50 μM. Besides, this series of Fe-MOF/MWCNTs also displays excellent repeatability, selectivity, and stability. Moreover, they show good performance in real sample detection and achieve good recovery of 95.47%–102.41% and 96.62%–103.15% in blood and urine samples, respectively. This high performance in fentanyl determination is mainly contributed by the Fenton-like process and the adsorption function of the Fe-MOF. Therefore, these novel Fe-MOF/MWCNTs are promising electrocatalysts for point-of-care device fabrication and also have potential applications in fentanyl rapid test technology.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Linkai Wang,Yu Han,Jian Wei,Qingjie Ge,Shijian Lu,Yanpeng Mao,Jian Sun
Hydrogenation of CO 2 into light olefins is an important route to carbon neutrality . Most of traditional researches focus on the catalyst component, structure, and promoter to enhance the selectivity of light olefins while ignoring the diffusion of products. Here, we report a NaFeZr-MOR composite catalyst for light olefin synthesis in CO 2 hydrogenation via pore confinement. The selectivity in hydrocarbons and STY (Space-time yields) of C 2–4 = is gradually increasing maximum up to 51.3% and 12.2 (mmol·g cat −1 . h −1 ), which lie in a high level among reported Fe-based catalysts. Further characterization revealed that the essence of selectivity change period is the accumulation and evolution of carbonaceous species, which causes the change of product diffusion behavior. It suppresses the escape of heavy hydrocarbons from MOR pores, leading to an increased light olefin, especially ethylene, which is called “dynamic confinement”. These findings provide a new insight for controlling low-carbon product selectivity in CO 2 hydrogenation.
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CHEMICAL ENGINEERING JOURNAL
·
2018
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IF 6.735
Wentao Shang,Zijun Dong,Mu Li,Xiulan Song,Miao Zhang,Chengchun Jiang,Sun Feiyun
As a type of iodinated contrast medium (ICM), the diatrizoate (DTZ) found in aquatic systems has posed a serious threat to the ecosystem and to human health. In this study, Fe(II)-activated persulfate (Fe 2+ /PS) oxidation was employed to degrade DTZ, and the optimal operating conditions were determined. Electron paramagnetic resonance (EPR) spectra and density functional theory (DFT) calculations were adopted to determine the dominant radicals and analyze the degradation paths, respectively. It was found that a PS concentration of 10 mmol/L, an n(Fe 2+ )/n(PS) ratio of 1:10, an initial pH of 3.0, and a high temperature increased the degradation efficiency of DTZ. After suppression of the oxidation process by tertiary butyl alcohol (TBA) and methanol (MtOH), the EPR spectra demonstrated that DTZ degradation was attributed to the combined effects of SO 4 − and OH and that OH played a more important role. Based on the theoretical calculation and comparison of the reduction energies of possible degradation products, the path from DTZ to TP630 and then to TP628 and finally to TP602 was recognized as the main DTZ degradation pathway during the Fe 2+ /PS oxidation process. These findings validated and demonstrated that DTZ could be effectively degraded by Fe 2+ /PS oxidation, which is a promising approach to remove DTZ from water.
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