APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Jianqing Ma,Qunfeng Yang,Yuezhong Wen,Weiping Liu
Heterogeneous Fe-N complexes are a kind of promising catalysts for the Fenton-like reaction. The present study selected a stable and inexpensive g-C 3 N 4 as the chelating agent and combined with the graphitized mesoporous carbon (GMC). The fabricated Fe-g-C 3 N 4 /GMC composite was characterized by several techniques including FTIR, XRD, XPS, TEM and STXM. Results showed clear sheets of g-C 3 N 4 and graphite with Fe evenly distributed mostly in the Fe-N coordination form. The catalyst expressed high activity in the Fenton-like reaction in a wide pH range of 4–10. 99.2% removal of Acid Red 73 was obtained in 40 min, and the degradation data well fitted with the pseudo-first-order kinetics model. By correlating the constant of reaction rates calculated from the model and the Fe speciation contents of the samples prepared at different conditions, we deduced that Fe-N species are the most important active sites for the Fenton-like reaction. More importantly, hydroxyl radicals played a great role in the whole reaction yet their generation was independent of visible light. Cyclic voltammetry results confirmed that the GMC can accelerate the Fe(III)/Fe(II) redox cycle by enhancing electron transfer, and thus enable this Fenton-like catalyst to perform well in a wide pH range.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qiansheng Li,Hong Lu,Xiaolei Wang,Zhongqiang Hong,Ze Fu,Xinxin Liu,Jiti Zhou
Low solar energy utilization, instability of Fe ions and Fe(III)/Fe(II) cycle difficulty are three main factors, limiting the photocatalytic activity of the Fe/peroxymonosulfate (PMS) system. Herein, based on the N and Fe co-doped carbon dots (N, Fe-CDs) synthesized by a facile one-pot hydrothermal method, a new Fe(III)/Fe(II) cycle system for PMS activation under visible light irradiation was proposed. The characterization experiments showed that Fe has been successfully doped to the sp 2 graphitic structure and mainly existed as Fe-N and Fe-OH complexes, which played an important role in harvesting visible light, enhancing the stability of Fe ions and acting as active sites to accelerate electron transfer. Under visible light irradiation, the photogenerated electrons of N, Fe-CDs could be directly transferred to Fe (III) for Fe (II) formation via the ligand-to-mental charge transfer process, thus accelerating the Fe(III)/Fe(II) cycle. When N, Fe-CDs were used for activating PMS under visible light irradiation, aminopyrine could be efficiently degraded and mineralized to CO 2 via the cleavage of pyrazole ring, demethylation, hydroxylation, decarbonylation and the cleavage of benzene ring. The produced O 2 − and 1 O 2 played the main roles in the whole photocatalytic reaction. The above results revealed that the novel N, Fe-CDs could effectively activate PMS under visible light irradiation for the degradation of pharmaceuticals in the polluted water.
研究领域:
环境科学
·
光催化
·
水处理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Guang Li,Yiqiao Zhang,Xue Zhang,Jian Zhang,Bo Sun
This study delves into the formation of ferryl ions (Fe(IV)) within the Fe(II)/peroxydisulfate (PDS) process, a pivotal reaction in advanced oxidation processes (AOPs) aimed at organic pollutant removal. Our findings challenge the conventional view that Fe(IV) predominantly forms through oxygen transfer from PDS to Fe(II), revealing that sulfate radicals (SO4•–) play a crucial role in Fe(IV) generation. By employing competitive kinetics, the second-order rate constant for Fe(III) oxidation by SO4•– was quantified as 4.58 × 108 M–1 s–1. Factors such as the probe compound concentration, chloride presence, and iron species influence Fe(IV) generation, all of which were systematically evaluated. Additionally, the study explores Fe(IV) formation in various Fe(II)-activated AOPs, demonstrating that precursors like peroxymonosulfate and H2O2 can also directly oxidize Fe(II) to Fe(IV). Through experimental data, kinetic modeling, and oxygen-18 labeling experiments, this research offers a comprehensive understanding of the Fe(II)/PDS system, facilitating the optimization of AOPs for pollutant degradation. Finally, introducing HSO3– was proposed to shift the Fe(II)/PDS process from Fe(IV)-dominated to SO4•–-dominated mechanisms, thereby enhancing pollutant removal efficiencies.
研究领域:
环境科学
·
化学动力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2024
·
IF 3.2
Wenlong Ma,Tianxu Hao,Xinya Wang,Wei Zhang,Yonggui Li,Mingxing Chen
In this paper, a high-performance composite nanofiber membrane with excellent air filtration and dye degradation properties was prepared by incorporating MIL-53(Fe) nanoparticles into the electrospinning solution. The results showed that the filtration efficiency for PM2.5 of the PP/PVDF-HFP/MIL-53(Fe) composite nanofiber membrane reached up to 99.3% with the addition of 2 wt% MIL-53(Fe). Moreover, the composite nanofiber membrane exhibited steady filtration efficiency across different parameters, including air velocity, PM2.5 concentration, and extended testing time. Furthermore, the incorporation of MIL-53(Fe) significantly enhanced the removal efficiency of the composite nanofiber membrane toward Rh B, resulting in a remarkable 91% removal rate. The polymer/MOF composite nanofiber membranes prepared by simple and cheap electrospinning technology have a wide range of practical applications in the field of environmental protection. Highlights PPM composite nanofiber membrane was prepared via electrospinning method. MIL-53(Fe) nanoparticles were introduced to PPM composite nanofiber membrane. PPM composite nanofiber membrane showed excellent removal efficiency for PM2.5. PPM composite nanofiber showed a good removal performance for RhB in solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2019
·Vol. 3
·期 12
·3455-3461
·
IF 4.912
Bomin Feng,Xiuju Wu,Yanli Niu,Wei Li,Yunxi Yao,Weihua Hu,Chang Ming Li
Fe/N–C catalysts show great potential for the oxygen reduction reaction (ORR) but their catalytic activity should be further improved for practical application. Here, we report a high performance Fe/N–C hollow sphere with excellent ORR activity in both alkaline and acidic solutions. It is synthesized via pyrolysis of a melamine/Fe-incorporated polydopamine nanosphere precursor at 800 °C in an argon atmosphere. The N-rich melamine in the precursor affords abundant N dopants to form dense Fe–Nx active sites and also facilitates the formation of micropores in the catalyst via the gasification effect, together improving the ORR activity. The as-reported Fe/N–C catalyst outperforms the Pt/C catalyst in basic media (45 mV more positive half wave potential), approaches the Pt/C catalyst in acidic media (55 mV lower half wave potential), and exhibits impressive performance in Zn–air primary batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Dongping Zhang,Yongdi Liu,Yanyu Song,Xianbo Sun,Wen Liu,Jun Duan,Zhengqing Cai
A Fe-doped CeO 2 was fabricated for catalytic ozonation of Amoxicillin (AMX), and the catalytic mechanisms were explored in this study. Under optimal conditions (the initial solution pH of 7.0, FC-0.3 dosage of 0.5 g/L, O 3 dosage of 4 mg/min), the AMX and TOC removal by the optimal material (FC-0.3, at Fe/Ce atomic ratio of 0.3) reached 98.1 % at 24 min and 55.2 % at 36 min, respectively. Improved the AMX mineralization efficiency by 3.7 times. The experiments and theoretical calculation reveal the mechanisms of promoted catalytic ozonation by FC-0.3: 1) Highly abundant surface-active sites (i.e., –OH) enabled the adsorption of H 2 O and O 3 , which was favorable to the generation of reactive oxygen species (ROS) and improved the reaction probability for ROS and contaminants. 2) The synergistic effect between Ce 4+ /Ce 3+ and Fe 3+ /Fe 2+ redox couples accelerated the electron transfer and formation of ROS. More than 42 % of •OH was generated in the presence of FC-0.3, and the •OH, •O 2 − and 1 O 2 were the main ROS that contributed to AMX degradation. The surface OH groups played a key role in the catalytic ozonation. The oxygen vacancies (OVs) played an important role in electron transfer, Ce and Fe were the active sites of electrons transfer following the sequence of (Ce 3+ + Fe 2+ ) → (Ce 4+ + Fe 3+ ) → (Ce 3+ + Fe 2+ ) redox reaction. The degradation pathway investigation and toxicity evaluation revealed that some more toxic intermediates were generated during the ozonation process, and sufficient mineralization is required to meet safe discharge. This study provides reference for the synthesis of new catalysts and insight into the reaction mechanisms in the heterogeneous catalytic ozonation process.
研究领域:
环境科学
·
催化材料
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Yibing Xie,Mengyu Wang,Xueqian Wang,Langlang Wang,Ping Ning,Yixing Ma,Jichang Lu,Rui Cao,Yu Xue
The traditional way for arsine (AsH 3 ) removal from the reducing exhaust gas by catalytic oxidation undershot the expect goal in pollutant emission control. This laboratory scale work used magnetic field to improve the chemical environment of AsH 3 catalytic oxidation over magnetic response catalyst Fe/HZSM-5. After introducing external magnetic field at a magnetic field intensity of 0.1 T, the catalytic performance of Fe/HZSM-5 for AsH 3 removal was improved by 52%, and the turnover frequency (TOF) value increased from 4.65 × 10 −3 s −1 to 5.73 × 10 −3 s −1 . The structure–activity relationship of the catalyst in the presence of magnetic field was investigated. The characterization results showed that Fe is mainly anchored onto the surface of Fe/HZSM-5 catalyst through an oxygen bridge, while a small proportion of Fe exists in the form of iron oxides . The Fe species and surface labile oxygen (O − ) in the aluminum tetrahedra are the magnetic active sites of Fe/HZSM-5, magnetic field promotes the reaction by increasing the activity of them. It was discovered that paramagnetic O − increased by 50% in the presence of magnetic field compared with that in its absence. Therefore, a magnetic-field-assisted oxygen cycling process is proposed. In terms of the stability of catalyst, formation of more amorphous oxidized arsenic after reaction in the presence of magnetic field reduced the toxicity to the strong acid sites of the catalyst, and the holding time of excellent AsH 3 removal efficiency was prolonged from 23 h to 35 h. These results provide new insights into magnetic-field-assisted zeolite catalysis.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yanyu Song,Xianbo Sun,Long D. Nghiem,Jun Duan,Wen Liu,Yongdi Liu,Zhengqing Cai
Building a heterojunction is a fascinating option to guarantee sufficient carrier separation and transfer efficiency, but the mechanism of charge migration at the heterojunction interface has not been thoroughly studied. Herein, MIL-53(Fe)/Bi 4 O 5 I 2 photocatalyst with a Z-scheme heterojunction structure is constructed, which achieves efficient photocatalytic decontamination under solar light. Driven by the newly-built internal electric field (IEF), the formation of Fe-O-Bi electron migration channel allows for rapid separation and transfer of charge carriers at the heterojunction interface, confirmed by the material characterization and density functional theory (DFT) calculation. The narrower band gap and improved visible light response also contribute to the enhanced photocatalytic activity of composite materials. With levofloxacin as the target pollutant, the optimal MIL-53(Fe)/Bi 4 O 5 I 2 achieves complete removal of pollutant within 150 min, the photocatalysis rate of which is ca. 4.4 and 26.0 times that of pure Bi 4 O 5 I 2 and MIL-53(Fe), respectively. Simultaneously, the optimal composite material exhibits satisfactory photodegradation of seven fluoroquinolones, and the photocatalysis rates are as follows: lomefloxacin > ciprofloxacin > enrofloxacin > norfloxacin > pefloxacin > levofloxacin > marbofloxacin. DFT calculations reveal a positive relationship between degradation rate and Fukui index (ƒ 0 ) of main carbon atoms in seven fluoroquinolones. This study sheds light on the existence of electron migration channels at Z-scheme heterojunction interface to ensure sufficient photoinduced carrier transfer, and reveals the influence of pollutant structure on photolysis rate.
研究领域:
材料科学
·
环境科学
·
化学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·13363-13371
·
IF 3.553
Cao Yutao,Yuan Yue,Shang Yafen,Zverev Vladimir I.,Gimaev Radel R.,Barua R.,Hadimani R. L.,Mei Lan,Guo Gang,Fu Hao
Micro-sized particles of Fe x Rh 100− x ( x = 50, 48, 45, 40, and 35) binary alloys were synthesized by a solid-phase reduction method and their structural properties, magnetic properties and cytotoxicity have been characterized. From X-ray diffraction results, the Fe 50 Rh 50 alloy is in a single chemically ordered α ′ phase while the face-centered cubic disordered γ phase arises and increases with Rh content when x is smaller than 50. The magnetization behavior of the alloys demonstrates that the α ′ phase consists of ferromagnetic and antiferromagnetic components due to the nonuniformity of elements in the particulate alloys. The maximal magnetic entropy change and the relative refrigeration capacity of the Fe 50 Rh 50 particles reach 9.7 J/kg K and 230 J/kg, respectively, with a 0–3 T magnetic field change. Despite its moderate magnetic entropy among the first-order transition materials, Fe 50 Rh 50 microparticles are promising for biomedical applications due to its large relative cooling power and low cytotoxicity.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2024
·
IF 5.8
Shengnan Zhang,Lingyi Li,Junxue Li,Wei Cheng
Hematite displays diverse crystal structures and often coexists with Fe(II), both of which are crucial in controlling the fate and mobility of Cr(VI). However, the mechanisms underlying Cr(VI) removal in the presence of Fe(II) on various hematite facets remain elusive. This study aims to elucidate the facet-dependent reactivity of hematite nanocrystals in conjunction with Fe(II) for the removal of Cr(VI) from aqueous solutions. Hematite nanoplates (HNPs), predominantly composed of {001} facets, and nanorods (HNRs), exposing both {001} and {110} facets, were synthesized and characterized. Their Cr(VI) removal capabilities were evaluated in hematite–Cr(VI) and hematite–Fe(II)–Cr(VI) systems, as well as the Fe(II)–Cr(VI) system. The adsorption of Fe(II) and Cr(VI) on hematite surfaces was highly dependent on the crystal facets and pH, with HNRs demonstrating superior Cr(VI) adsorption over HNPs, especially under acidic conditions. Neutral pH favored Fe(II)–Cr(VI) redox reactions and Fe(II) adsorption. The hematite–Fe(II) couple displayed a synergistic effect in removing Cr(VI) under acidic conditions, which was not observed under neutral conditions. The presence of Fe(II) notably enhanced Cr(VI) adsorption onto hematite, and bound Fe(II) facilitated electron transfer, accelerating Cr(VI) reduction. HNRs–Fe(II) exhibited higher Cr(VI) removal efficiency than HNPs–Fe(II) due to their lower free corrosion potential and improved electron transport properties. This research underscores the potential of facet engineering in optimizing hematite nanocrystals for environmental remediation, specifically in Cr(VI)-contaminated environments.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
分析化学
·
材料科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Fang Zhang,Lei Wang,Lutao Yang,Yong Dai,Jun Zhang,Lei He,Juqing Cui,Jian Shen,Zhe Wang
Immobilized microbial technology is a simple, cost-effective, and efficient technique to minimize the difficulty and energy consumption of heavy oil extraction, as well as the COD of oilfield wastewater. In this work, PC- g -Mag(Fe-MOF) was prepared to immobilize microorganisms obtained by grafting lecithin after magnetization using Fe-MOF. The orthogonal tests showed that the optimum temperature for immobilized microorganisms was 38 °C, the optimum pH was 7, the optimum inoculum was 7 % and the desired mineralization level was <20,000 ppm. The viscosity of free and immobilized microorganisms decreased by 61.5 % and 76 %. The recovery efficiency of the carrier with two species of bacteria after 5 cycles of experiments was 87.5 % and 73.2 %, respectively. The removal rate of COD in the 5th time was 69.3 %, the viscosity reduction rate of heavy oil was 61.6 %. The recovery efficiency of heavy oil was increased by 25.09 %. Fe-MOF acts as a biocarrier to immobilize bacteria and enhance the metabolic activity of their microbial communities and improves COD removal from oilfield wastewater and viscosity reduction in heavy oil.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）