JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2022
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IF 10.319
Xiaotong Feng,Lifen Gu,Naiyu Wang,Qiaosheng Pu,Guangli Liu
Carbon-based adsorption and TiO 2 -based photocatalysis are both safe and low-cost ways of pollutant purification. Constructing C-TiO 2 architectures can effectively improve removal efficiency. However, most of those carbon frames only acted as supporting substrates, exhibiting rather limited synergistic action from TiO 2 and carbon. Herein, Fe/N co-doped nano-TiO 2 wrapped on mesoporous carbon spheres with a core-shell structure was designed. The Fe, N co-doped carbon sphere with a hierarchical structure improved the synergy of adsorption and transfer during the photocatalytic process. Without extra dopant, the Fe and N partly exposed on the surface realized the in-situ migrating into the TiO 2 shell to enhance the interface effect, which significantly promoted the photocatalytic efficiency of the composite. Furthermore, the photocatalytic efficiency of the composite was investigated through two typical pollutants under visible-light irradiation. The degradation efficiencies for rhodamine B and paraxylene were 96.2% in 60 min and 94.1% in 20 min, respectively, with the apparent rate constant of 0.045 min –1 and 0.049 min –1 , 8.3 and 11.4 times of that for bare TiO 2 . The composite is likely advantageous for treating diverse environmental pollutants.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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IF 4.598
Tao Wang,Jing Feng,Qian Liu,Xiaofeng Han,Dongling Wu
Here, a simple and green synthesis process of Fe/N-codoped reduced graphene oxide (Fe-N-C/NG) with high electrocatalytic activity for oxygen reduction reaction (ORR) is reported. The synthesis of 3D porous structure of Fe-N-C/NG composites involves thermal drying the mixture of graphene oxide (GO), iron nitrate and aspartic acid (Asp) directly, follow by pyrolysis the mixture. The Asp is introduced as an environment-friendly nitrogen and carbon source, and the iron nitrate serves as the pore-forming agent and a gas producer that prevents the agglomeration of graphene. The as-prepared Fe-N-C/NG exhibits 3D loose porous structure with larger specific surface area (245 m 2 g - 1 ). The Fe-NC/NG composite exhibits the onset potential of 0.91 V, a half-wave potential (E 1/2 = 0.83 V), low Tafel slope and four-electron selectivity (n = 3.99) in alkaline solution. Furthermore, the stability test manifests the outstanding stability of Fe-NC/NG electrocatalyst and a superior methanol tolerance than Pt/C electrodes. Particularly, when the prepared Fe-NC/NG-3 catalyst is used as an air electrode catalyst in an assembled Zn-air battery, it exhibits a high specific capacity of 848.2 mAh g Zn -1 and displays more stability than Pt/C. This work provides an effective strategy for preparing high ORR and Zn-air battery performance Fe/N-codoped reduced graphene oxide materials.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Yuanzheng Zhang,Xiang Chen,Chao Liang,Lifeng Yin,Yang Yang
This study develops an advanced single-atomic iron-loaded graphitic carbon nitride (Fe 1 /CN) with unparalleled efficiency for converting peroxymonosulfate (PMS) to oxidants for water treatment. We found that acid-etching of Fe 1 /CN leads to the reconstruction of conventional Fe 1 –N 4 to Fe 1 –C 2 N 1 active sites. The acid-induced Fe 1 –C 2 N 1 sites are more favorable for PMS binding and have a lower energy barrier for 1 O 2 production. The precise tuning of the coordination environment bestows the acid-etched Fe 1 /CN with 29 times higher rate constants of bisphenol A degradation than its pristine counterparts. Further, the particulate catalysts were assembled into a self-supported catalytic membrane, which demonstrates excellent long-term durability throughout 170 h flow-through tests in both synthetic and real wastewater . This work provides pivotal insights into improving PMS activation activity by regulating the coordination environment around single atomic Fe sites. The engineering innovation laid the groundwork for new point-of-use water treatment devices.
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Surfaces and Interfaces
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2022
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IF 6.137
Chengxin Li,Zhuwei Gao,Xinyu Qi,Xintong Han,Zhongxin Liu
To control the water pollution caused by industrial oily wastewater, scientific research in the field of oil-water separation has begun all over the world, which has also attracted extensive attention to green advanced separation materials. Herein, we used stainless steel mesh as one of the reactants to load metal oxide particles formed by tetrabutyl titanate (TBT), and manganese acetate on cotton mesh under acidic conditions to prepare a membrane material with excellent oil-water separation. The results showed that the 0.1/0.3/0.5 Mn-TiO2/Fe membranes prepared by high-temperature hydrothermal reaction had an excellent separation effect in the light oil and water separation after 10 cycles, and its maximum oil-water separation efficiency was 89.87%, 92.65% and 96.96% respectively. At the same time, the membrane still had good hydrophobicity after acid, alkali and high temperature and low-temperature treatment. In the light oil and water separation experiment measured after 15 times of friction with sandpaper, the 0.5Mn-TiO2/Fe membrane showed good durability, and the average separation efficiency was 93.82% respectively. This diversified wettability and separation process of stainless steel mesh load on the membrane surface has a wide range of potential applications in environmental protection, energy utilization, industrial manufacturing and so on.
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CHEMOSPHERE
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2022
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IF 8.943
Sheng Fan,Xinru Lu,Haoliang Li,Xiaodong Du,Xiaoyu Huang,Yao Ma,Juan Wang,Xueqin Tao,Zhi Dang,Guining Lu
Organophosphate esters (OPEs) are a new class of flame retardants present in diverse waters. The study focused on the removal of aqueous OPEs using functionalized MIL-101(Fe), which was a representative of the metal-organic frameworks (MOFs). Adsorption kinetics of tris(2-chloroethyl) phosphate (TCEP), tributyl phosphate (TnBP), and triphenyl phosphate (TPhP) were investigated. Additionally, TCEP was selected as the model contaminant to study the adsorption isotherms, thermodynamics, and effect of solution matrix properties. Adsorption mechanisms obtained from the experiments were confirmed using density functional theory (DFT) calculations. Adsorption kinetics indicated that functionalized MOFs provided a significant enhancement to the removal of TCEP. The maximum adsorption capacities q m of MIL-101(Fe), MIL-101(Fe)–NH 2 , MIL-101(Fe)–OH, and MIL-101(Fe)–CH 3 at 298 K for TCEP were 76.040, 282.940, 119.680, and 181.274 μmol/g, respectively. By comparing the adsorption behavior of functionalized MOFs, MIL-101(Fe)–NH 2 was proved to be most efficient for TCEP removal . Based on the adsorption experiments and DFT calculations, TCEP removal was dominated by physical adsorption. The van der Waals (vdW) interactions and hydrogen bonding were assumed to be involved in the adsorption. This work proves that appropriate ligand functionalization is promising for the removal of aqueous OPEs, which also provides a new insight for the control of OPEs pollution.
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Ting Pan,Huanhuan Chen,Xiang Gao,Zeyu Wu,Yingwang Ye,Yizhong Shen
Bacterial biofilms have evoked worldwide attention owing to their serious threats to public health, but how to effectively eliminate bacterial biofilms still remains great challenges. Here, we rationally designed a novel and vigorous chitosan grafted Fe-doped-carbon dots ( [email protected] /CDs) as an efficient artificial nanozyme to combat rigid bacterial biofilms through the selective activation of Fenton-like reaction-triggered peroxidase-like catalytic activity and the synergistic antibacterial activity of CS. On the one hand, the peroxidase-like catalytic activity made [email protected] /CDs catalyze H 2 O 2 for producing hydroxyl radicals (•OH), resulting in efficient cleavage of extracellular DNA (eDNA). On the other hand, CS was capable of binding with the negatively charged cell membrane through electrostatic interaction, changing the cell membrane permeability and causing cell death within bacterial biofilms. Based on their synergistic effects, the fragments of bacterial biofilm and exposed bacteria were persistently eradicated. Remarkably, [email protected] /CDs-based nanozyme not only enabled the effective destroying of gram-positive Staphylococcus aureus ( S. aureus ) biofilms, but also completely eliminated gram-negative Pseudomonas aeruginosa ( P. aeruginosa ) biofilms, showing great potential as a promising anti-biofilm agent against bacteria biofilms. This proposed synergistic strategy for bacterial biofilm eradication might offer a powerful modality to manage of bacterial biofilm fouling in food safety and environmental protection.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Wen-Jian Yang,Li-Hui Yang,Han-Jun Peng,Si-Hao Lv,Hafiz Muhammad Adeel Sharif,Wei Sun,Wei Li,Cao Yang,Hui Lin
Electroreduction removal of nitrate (NO 3 – -N) is considered as a promising approach to solve its adverse effects on environment and human health, where efficient and cheap catalysts are required. Perovskite-based catalysts showed a versatile catalytic ability for wide range of redox reactions, but seldom applied for NO 3 – -N reduction. Herein, four perovskite oxide cathodes, LaMO 3-δ (M = Fe, Co, Ni and Cu) were prepared and used for the reduction of NO 3 – -N. The Ruddlesden-Popper (RP) type La 2 CuO 4 exhibited the best NO 3 – -N catalytic activity among the four perovskite oxide cathodes, with a removal rate of 11.7 × 10 -3 min −1 . The high selectivity of NH 4 + -N (82.4 ± 2.2%) indicated that NH 4 + -N was the main final product for NO 3 – -N electroreduction at La 2 CuO 4 cathode, but 100% of N 2 selectivity could be obtained with addition of 1000 and 1500 mg/L Cl - as the electro-assisted chlorination process. The mechanism of NO 3 – -N electroreduction occurred by both electron- and H*-mediated pathway, and the oxygen vacancies and redox cycle of Cu(I)-Cu(II)-Cu(I) were proposed as the accommodation sties and direct electron sources for NO 3 – -N reduction. Generally, this study opens a novel avenue for the development of earth-abundant, cost-effective catalyst with effective NO 3 – -N electroreduction.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Shan Xue,Zhilin Xie,Xiaoyu Ma,Yinqi Xu,Shiyu Zhang,Qina Jia,Rui Wan,Haisheng Tao
Carbon-based catalyst-activated persulfate-driven advanced oxidation processes (AOPs) have received great attention for wastewater treatment . Herein, a magnetic Fe-doped activated carbon (FeC 2 O 4 /AC) was successfully prepared via a conventional method using FeC 2 O 4 as an iron source and Zoysia sinica as biomass. FeC 2 O 4 /AC was characterized and used to activate peroxymonosulfate (PMS) for Rhodamine B (RhB) degradation. The influence of various factors on RhB removal was evaluated, including initial pH, temperature, coexisting ions, RhB concentration, PMS concentration and catalyst dosage. Under the optimized condition, the removal efficiency of FeC 2 O 4 /AC for RhB (300 mg/L) reached up to 97% within 150 min. Radical scavenging results and EPR experiments confirm that singlet-oxygen ( 1 O 2 ) was confirmed as the main active species in the degradation of RhB in the FeC 2 O 4 /AC/PMS system. More importantly, the possible route of 1 O 2 generation was revealed: the synergistic effect of Fe species and the activated carbon acts as a crucial part in promoting the PMS activation and contributing to the generation of 1 O 2 . The reaction rate constant ( k obs ) of FeC 2 O 4 /AC is about 7.4 times that of pure AC, and the excellent leaching rate of Fe 2+ (<0.09%) proves that this material is an excellent catalyst. This research on the development of Fe-doped activated carbon with high activity and high stability has profound implications for the effective treatment of organic wastewater.
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SYNTHETIC METALS
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2022
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IF 4
Jinghao Wu,Shuangshuang Cai,Qiuyu Kong,Meng Chen,Zuanguang Chen
Existing electrochemical sensors generally possess limited sensitivity, which necessitates the use of high-cost materials such as precious metals and enzymes. Therefore, the development of electrochemical sensors that have low synthesis cost, short detection time, simple operating process, high sensitivity and non-precious metals is highly desirable for establishing modern and more efficient electrochemical analysis methods. Herein, we used sodium borohydride reduction method to load Fe and Co onto multi-walled carbon nanotubes (Co,Fe/MWCNT). The successful doping of two metals exposes a large number of active sites in the material and increases the effective area. The morphology and elemental composition of the composite material were determined, and the material was used to modify a glassy carbon electrode for the construction of a hypersensitive electrochemical sensor. Subsequently, the electrochemical behavior of rutin on the constructed sensor was investigated under optimum conditions. The reduction peak current and concentration of rutin were found to exhibit a good linear relationship within the concentration ranges 8 × 10 −4 –8 × 10 −3 µmol/L (R 2 = 0.998), 1 × 10 −2 –0.1 µmol/L (R 2 = 0.996), and 1–200 µmol/L (R 2 = 0.998). The electrode also showed good reproducibility and a low limit of detection of 2.8 × 10 −4 µmol/L (3S 0 /S). Importantly, the sensor was successfully applied for the measurement of rutin content in tablet and urine. Thus, an effective analytical platform for rutin determination during the analysis of real drug and biological samples was developed.
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JOURNAL OF SOLID STATE CHEMISTRY
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2022
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IF 3.656
Haoran Jiang,Yong Hu,Yong Jiang
Owing to the increased depletion risk and cost of phosphate mines, the demand for low phosphorus or ecological phosphorus flame inhibitor is increasing. This study reports an experimental exploration of the combustion inhibition efficiency of bio-based transition metal complex materials containing iron and phosphorus, namely, iron @ phosphorus complex (Fe-PMC). The aim is to develop a new type of flame inhibitor with an iron-phosphorus interaction effect to replace pure phosphorus extinguishing agents. The synthesis of Fe-PMC was characterized by Fourier-transform infrared spectroscopy, X-Ray diffraction, X-ray photoelectron spectroscopy and Scanning electron microscope. The Fe-PMC (ⅰ) is the mesh porous structure connected by the accumulation of small particles, (ⅱ) is an amorphous structure with many binding sites exposed and excellent interface compatibility, (ⅲ) contains no chloride ions . Suppression tests and thermogravimetric measurements indicate that (ⅰ) Fe-PMC has a higher combustion inhibition ability than MIL-53 containing only iron, especially at low concentrations, (ⅱ) Fe-PMC reduces the laminar flame velocity of cellulose , (ⅲ) Fe-PMC greatly reduces flame temperature. The activation energy (E), pre-exponential factor (A) and char yield (Y) of cellulose pyrolysis were determined by kinetic analysis . It concluded that MIL-53 and Fe-PMC produce combustion inhibition mainly in the solid phase. These findings will contribute to the development of a flame inhibitor with low or no phosphorus and better performance.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
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IF 5.999
Mengmeng Xie,Xiuying Liu,Shige Wang
In this study, a low-cost and high-performance MoS 2 /sodium alginate (SA)/Fe (MSF) hydrogel catalyst was prepared. It was found that the MSF hydrogel could efficiently catalyze the degradation of methylene blue (MB) through the Fenton reaction without the addition of Fe 2+ . The reaction was initiated by Fe 2+ which was derived from the cyclic redox reaction between MoS 2 and Fe 3+ and produced large quantities of ·OH to degrade the MB. The effect of MoS 2 concentration, FeCl 3 ·6H 2 O concentration, H 2 O 2 dosage, solution pH, and light on the degradation was systematically studied. The MoS 2 concentration of 0.5 mg/ mL, FeCl 3 ·6H 2 O concentration of 0.25 g/mL, 50 μL H 2 O 2 , and the pH of 4.0 were the optimized parameters. Moreover, it was found that the MB degraded faster under the infrared radiation. The MB removal rate reached as high as 98% within 15 min in the presence of a low concentration of H 2 O 2 and the procedure could be repeated 5 times. The MSF hydrogel provided an effective and simple strategy for the sustainable degradation of organic pollutants in wastewater.
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MATERIALS CHEMISTRY AND PHYSICS
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2022
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IF 4.778
Zhenhu Guo,Jingsong Lu,Wensheng Xie,Xuezhong Li,Hong Wu,Lingyun Zhao
The strategic design for fabricating metal phenolic networks (MPNs) at different dimension brings potential possibilities to obtain MPNs-based system with controlled structure, biologically tunable physicochemical properties and high responsiveness behavior. Considering adequate Fe ions within Fe-based materials, self-supplied metal ions for polyphenol to form coating layer on the surface are served as a novel and facile strategies to obtain metal-based phenolic networks composites. Combing these, herein, a simple, green and fast strategy was performed to fabricate recyclable Fe@Fe 3+ -tannic acid-Au (Fe@MPNs-Au) system with high efficiency to catalyze the reduction of 4-nitrophenol. The obtained experimental results showed that the catalytic rate of Fe@MPNs-Au for 4-nitrophenol could be improved from 0.4398 min −1 to 1.5804 min −1 with the increase of Au loading. Additionally, the increased Fe 3+ -tannic acid MPNs layer thickness could also enhance the catalytic rate of Fe@MPNs-Au from 0.2226 min −1 to 2.085 min −1 . More importantly, the superior magnetic properties contributed by Fe core make it possible to be easily separated and collected by a magnet from the solution after multiple catalytic reduction reaction. Finally, we hope this strategy can provide a novel paradigm for fabricating metal-based phenolic networks system by in situ coordinating reaction between self-supplied Fe sources and phenolic molecules.
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