COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Yubo Wu,Chu Dai,Yulun Nie,Xike Tian,Chao Yang
Surface Fe 2+ content has become a limiting step of α-Fe 2 O 3 Photo-assisted Fenton catalytic activity, and a high-efficiency process is urgently required to enhance it. Herein, α-Fe 2 O 3 catalysts with three different morphologies (cube, sphere, and leaf-like) were successfully synthesized under hydrothermal conditions and presented quite different Photo-assisted Fenton-like activities for Rhodamine B (RhB) degradation. Unexpectedly, catalysts show certain activity, especially leaf-like α-Fe 2 O 3 ( L -Fe 2 O 3 ) showed the highest RhB catalytic degradation activity. The mechanistic study has found that the morphology will change the surface Fe 2+ content of α-Fe 2 O 3 , which will affect the Fe 2+ /Fe 3+ cycle and the role of surface Fe 2+ in a Photo-assisted Fenton-like system proved by the results of XPS measurements and 2,2-bipyridine (BPY) quenching experiment. In addition, the L -Fe 2 O 3 catalyst represented broad applicability and stability, which is beneficial for the actual industrial application.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Huai Wang,Zhenyu Yuan,Jingfeng Li,Renze Zhang,Fanli Meng
Xylene is not only a carcinogenic gas, but also one of indoor pollution gases. Therefore, it is indispensable to develop a xylene gas sensor with fast response and high sensitivity. In this paper, 5 wt%rGO-Fe 2 (MoO 4 ) 3 -1 wt%Pt gas sensitive material was prepared by integrating the excellent properties of reduced graphene oxide (rGO) and noble metal Pt. In addition, the microstructure, elemental composition, phase and crystal structure of 5 wt%rGO-Fe 2 (MoO 4 ) 3 -1 wt%Pt nanocomposites were characterized. The nanostructure of Pt-modified Fe 2 (MoO 4 ) 3 nano-hollow spheres compounded on rGO was successfully prepared. The gas sensitive experiment results showed that 5 wt%rGO-Fe 2 (MoO 4 ) 3 -1 wt%Pt had better gas sensitive performance than Fe 2 (MoO 4 ) 3 (FMO), FMO-1 wt%Pt and 5 wt%rGO-FMO. At the optimum working temperature (175℃), the 5 wt%rGO-FMO-1 wt%Pt sensor had a maximum response value to xylene, and could detect 500 ppb xylene. In addition, the 5 wt%rGO-FMO-1 wt%Pt nanocomposite showed a rapid response and recovery process to xylene. Moreover, the gas sensitivity mechanism and enhancement of gas sensitivity of 5 wt%rGO-FMO-1 wt%Pt to xylene were systematically analyzed. The 5 wt%rGO-FMO-1 wt%Pt gas sensor prepared provided a new reference for the detection of xylene.
研究领域:
材料科学
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环境科学
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传感器技术
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 22
·期 4
·1477-1481
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IF 5.101
Wei Tao Huang,Wan Yi Xie,Yan Shi,Hong Qun Luo,Nian Bing Li
We provide a novel, simple, and general strategy based on a DNA–graphene oxide (GO)–Fenton hybrid system for fluorescence turn-on detection of hydroxyl radicals (HO˙) and Fe2+, in which GO as a nanoquencher is utilized for reducing the background signal and simplifying procedures. Fluorescence resonance energy transfer (FRET) between GO and dye units incorporated into DNA is switched off as a result of HO˙-induced strand breakage in the single-stranded DNAs, restoring the fluorescence of the quenched fluorophores. In our assay, HO˙ is generated by Fe2+ catalyzing decomposition of hydrogen peroxide through the Fenton reaction. Therefore, switching off FRET depends on the amounts of Fe2+ and HO˙. In vitro assays with Fe2+ and HO˙ demonstrated increases in fluorescence intensity with a linear range from 10 nM to1 μM and a detection limit as low as 2.4 nM.
研究领域:
生物化学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
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IF 4.939
Chongqi Chen,Hongju Ren,Jianke Zhou,Yu Luo,Yingying Zhan,Chaktong Au,Xingyi Lin,Lilong Jiang
Two precursors, namely, p -CFO- T (tetragonal) and p -CFO- C (cubic), were fabricated by a sol-gel method via citric acid and poly(vinyl alcohol) complexation, respectively. After H 2 -reduction, the two were converted to Cu/Fe 3 O 4 catalysts of different complexions, which are named as CFO-CA and CFO-PVA, respectively. The distribution of Fe 2+ and Fe 3+ in the Cu/Fe 3 O 4 catalysts was studied by Raman and XPS techniques. It was disclosed that the distribution of Fe 2+ and Fe 3+ in Fe 3 O 4 has an effect on Cu–Fe 3 O 4 interaction and catalyst surface basicity . Compared to CFO-PVA, CFO-CA has a larger amount of Fe 3+ , which mostly sits at the octahedral sites, leading to stronger Cu–Fe 3 O 4 interaction, and a larger amount of catalyst surface sites that are of weak basicity. As a result, the critical elementary steps of WGS reaction , viz. water dissociation, –COOH decomposition and CO 2 desorption are promoted as reflected in the lower E a and higher catalytic activity of CFO-CA.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
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2014
·Vol. 21
·期 3
·1-8
·
IF 1.897
Geng Tong-Mou,Wu Da-Yu,Huang Wei,Huang Rong-Yi,Wu Gen-Hua
A monomer 1-acrolyl-2-rhodamine 6G hydrazide (AR6GH) was synthesized by the heterogeneous reaction of acryloyl chloride with rhodamine 6G hydrazide (R6GH) and characterized by 1 H NMR, FTIR and elememtal analyses. Then it was micellar copolymerized with acrylamide (AM), acrylic acid (AA) to obtain a water-soluble fluorescent copolymers (poly(AM-AA-AR6GH)) which were characterized by the method of FTIR and 1 H NMR. The viscosity average molecular weight M
η
– of poly(AM-AA) and poly(AM-AA-AR6GH)s were 1.76 × 10 6 , 8.58 × 10 4 and 7.68 × 10 4 g/mol, respectively. The fluorescent characteristic of the aqueous solutions of copolymers was investigated both in varied pH and in the presence of metal cations. The poly(AM-AA-AR6GH) was found to be a selective chemosensor for Hg 2+ , Cd 2+ , Fe 2+ , Pb 2+ ions. Obvious fluorescence enhancement was due to the photophysical response of the copolymer to the presence of Hg 2+ , Cd 2+ , Fe 2+ , or Pb 2+ ions. In addition, the ability of the copolymer to detect different metal cations (Ag + , Ba 2+ , Co 2+ , Cd 2+ , Cr 3+ , Cu 2+ , Fe 2+ , Fe 3+ , Hg 2+ , K + , Mg 2+ , Mn 2+ , Na + , Ni 2+ , Pb 2+ , Zn 2+ ) in aqueous solution was studied. The results suggest that copolymer may offer potential application for sensors of Hg 2+ , Cd 2+ , Fe 2+ , or Pb 2+ ions in aqueous solution.
研究领域:
材料科学
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分析化学
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产品关联
DOI
高影响因子
Water
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2024
·Vol. 16
·期 4
·532
·
IF 3
Juxiang Chen,Chong Ruan,Wanying Xie,Caiqiong Dai,Yuqiong Gao,Zhenliang Liao,Naiyun Gao
The degradation of sulfamethoxazole (SMX) via the Fe2+/Ultraviolet (UV)/sodium percarbonate (SPC) system was comprehensively investigated in this study, including the performance optimization, degradation mechanism, and predicting models. The degradation condition of SMX was optimized, and it was found that appropriate amounts ofCFe2+(10~30 μM) andCSPC(10 μM) under an acidic condition (pH = 4~6) were in favor of a higher degradation rate. According to probe compound experiments, it was considerable that∙OHand∙CO3−was the primary and subordinate free radical in SMX degradation, andk∙OH,SMXmaintained two times more than that ofk∙CO3−,SMX, especially under acidic conditions. The UV direct photolysis and other active intermediates were also responsible for the SMX degradation. These active intermediates were produced via the Fe2+/UV/SPC system, involving∙HO2,HCO4−,∙O2−, or1O2. Furthermore, when typical anions co-existed, the degradation of SMX was negatively influenced, owing toHCO3−andCO32−possibly consuming∙OHor H2O2to compete with SMX. In addition, the prediction model was successfully established via the back-propagate artificial neural network (BP-ANN) method. The degradation rate of SMX was well forecasted via the Back-Propagate–Artificial Neural Network (BP-ANN) model, which was expressed asYpre=tanh(tanh(xiWih)Who). The BP-ANN model reflected the relative importance of influence factors well, which was pH >t>CFe2+≈CSPC. Compared to the response surface method Box–Behnken design (RSM-BBD) model (R2= 0.9765, relative error = 3.08%), the BP-ANN model showed higher prediction accuracy (R2= 0.9971) and lower error (1.17%) in SMX degradation via the Fe2+/UV/SPC system. These findings help us to understand, in-depth, the degradation mechanism of SMX; meanwhile, they are conducive to promoting the development of the Fe2+/UV/SPC system in SMX degradation, especially in some practical engineering cases.
研究领域:
环境科学
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化学工程
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生物医学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Linxuan Xie,Tianshu Zhang,Xinyu Wang,Wenxin Zhu,Zhaoli Liu,Manshun Liu,Jing Wang,Liang Zhang,Ting Du,Chengyuan Yang,Mingqiang Zhu,Jianlong Wang
Semiconductor-based photocatalyst , whose efficiency distinctly hinges on the separation of photoinduced charge transfer within the interface of bulk structure, has incurred some intractable issues due to the existing energy barrier. Regulating the structure of MOF reasonably would feature an accelerated charge separation, and an effective utilization of photogenerated charges. Herein, a new type of MOF with both interior linker and metal valence modulation (m-MIL-101–1.0) is reported to boost photocatalytic activity owing to the formed charge migration pathway. At first, we introduced defective sites via CTAB, which acted as exposed sites for further reduction reaction. Then, NaBH 4 was used to achieve metal valence regulation. Benefiting from the unique structure, the Fe 3+ /Fe 2+ redox center was considered as a driving force to facilitate the charge transfer. It is properly considered that the activity improvement is attributed to the synergistic effect of both internal and external charge transfer channels. As a result, such m-MIL-101–1.0 has a higher activity than that of MIL-101 for photocatalytic degradation of tetracycline in water. We envision this interior configuration would be an ideal paradigm for tuning the activity of MOFs and extending the boundaries of MOF-based photocatalysts.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Engineering
·
2023
·
IF 12.8
Weiyang Lv,Hao Li,Jinhui Wang,Lixin Wang,Zenglong Wu,Yuge Wang,Wenkai Song,Wenkai Cheng,Yuyuan Yao
Realizing fast and continuous generation of reactive oxygen species (ROSs) via iron-based advanced oxidation processes (AOPs) is significant in the environmental and biological fields. However, current AOPs assisted by co-catalysts still suffer from the poor mass/electron transfer and non-durable promotion effect, giving rise to the sluggish Fe 2+ /Fe 3+ cycle and low dynamic concentration of Fe 2+ for ROS production. Herein, we present a three-dimensional (3D) macroscale co-catalyst functionalized with MoS 2 to achieve ultra-efficient Fe 2+ regeneration (equilibrium Fe 2+ ratio of 82.4%) and remarkable stability (more than 20 cycles) via a circulating flow-through process. Unlike the conventional batch-type reactor, experiments and computational fluid dynamics simulations demonstrate that the optimal utilization of the 3D active area under the flow-through mode, initiated by the convection-enhanced mass/charge transfer for Fe 2+ reduction and then strengthened by MoS 2 -induced flow rotation for sufficient reactant mixing, is crucial for oxidant activation and subsequent ROS generation. Strikingly, the flow-through co-catalytic system with superwetting capabilities can even tackle the intricate oily wastewater stabilized by different surfactants without the loss of pollutant degradation efficiency. Our findings highlight an innovative co-catalyst system design to expand the applicability of AOPs based technology, especially in large-scale complex wastewater treatment.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Caiwen Wu,Tianyi Guo,Yuhan Chen,Qiang Tian,Yanjuan Zhang,Zuqiang Huang,Huayu Hu,Tao Gan
Photoinduction is widely used to accelerate the Fe 3+ /Fe 2+ circulation in Fe 3+ /H 2 O 2 Fenton oxidation, however, the remained challenges in developing a facile, economical, and efficient synthetic methodology for the preparation of high-performance Fe-based Photo-Fenton catalyst and inevitably forming iron sludge limit its applications. Herein, starch-derived carbon (SC) encapsulated Fe 3 O 4 (Fe 3 O 4 @SC) magnetic nanocomposites are synthesized by mechanical activation treatment combined with high-temperature pyrolysis method using cassava starch as the carbon source. The photoelectrochemical properties of Fe 3 O 4 @SC are regulated by C O Fe bonds and oxygen vacancies in Fe 3 O 4 @SC, as well as graphitization of SC, which effectively accelerate the Fe 3+ /Fe 2+ circulation in Fe 3 O 4 @SC + H 2 O 2 system under visible light, thus Fe 3 O 4 @SC shows excellent catalytic performance and superior stability for the degradation of tetracycline hydrochloride, and the initiation rate constant is 2.4 times higher than that in dark. Moreover, quenching experiments and electron spin resonance results confirm that OH, O 2 − , and h + ( OH plays a critical role) are generated in the catalytic system of Fe 3 O 4 @SC + H 2 O 2 + visible light. This work provides new insights into a green and facile approach for the synthesis of Photo-Fenton catalysts, providing new avenue for the acceleration of Fe 3+ /Fe 2+ cycle under visible light-driven Fenton process.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xiaodong Ma,Tiantong Rao,Mingchen Zhao,Zhiwei Jia,Gengbo Ren,Jingyang Liu,Haiwei Guo,Zhineng Wu,Haijiao Xie
In-situ generation of iron catalysts in electro-Fenton (EF) process deserves more attention like in-situ generation of H 2 O 2 . In this work, a novel induced zero-valent iron (ZVI) electrode, which was composed of a graphite plate with good conductivity, ZVI powders and a small magnet, was for the first time designed through magnetic assembly. Fe 2+ could be slowly generated in-situ from induced ZVI electrode and effectively trigger EF oxidation of chlorobenzenes (CB) under neutral pH. Compared to the in-situ rapid release of Fe 2+ from sacrificial anodes and traditional one-time external dosing of Fe 2+ in EF, in-situ slow release of Fe 2+ from induced ZVI electrode was the most effective way to activate electrogenerated H 2 O 2 under neutral pH. Induced ZVI electrode had obvious advantages in terms of effective active areas, corrosion potentials and current responses. The optimum conditions including pH of 7.0, current of 29.9 mA, ZVI of 0.10 g and electrolysis time of 35.25 min were obtained by the response surface methodology (RSM) model with the maximum removal efficiency of 99.12%. The uniformed weak positive charge on the ZVI powders induced by the electric field was the dominant contribution to the in-situ slow release of Fe 2+ from the induced electrode. And, the impact of magnetic field on the CB removal and the release of iron ions was negligible. The degradation mechanism was revealed through the Fukui function based on the density functional theory (DFT) and by-products analysis. The evolution of acute toxicity to zebrafish in EF was further clarified. Besides, this induced ZVI electrode could be easily reused and has satisfactory stability. In briefly, this work provided a novel idea for the in-situ slow release of Fe 2+ in EF process.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Wen Lu,Aimin Wang,Yanyu Zhang,Songyu Ren,Zhongguo Zhang
The widespread existence of antibiotics in the environment has attracted growing concerns regarding the potential adverse effects on aquatic organisms, ecosystems, and human health even at low concentrations. Extensive efforts have been devoted to developing new methods for effective elimination of antibiotics from wastewater. Herein, a novel process of Fe 2+ catalytically enhanced vacuum ultraviolet (VUV) irradiation was proposed as a promising approach for the removal of antibiotic trimethoprim (TMP) in water. Compared with UVC photolysis, VUV photolysis, and UVC/Fe 2+ , VUV/Fe 2+ could increase the pseudo-first-order reaction rate constant of TMP removal by 6.6–38.4 times and the mineralization rate by 36.5%–59.9%. The excellent performance might originate from the synergistic effect of VUV and Fe 2+ , i.e., VUV irradiation could effectively split water and largely accelerate the Fe 3+ /Fe 2+ cycle to generate more reactive oxygen species (ROS). EPR results indicated that • OH and O 2 •- were identified as the main ROS in the UVC/Fe 2+ and VUV/Fe 2+ processes, while • OH, O 2 •- , and 1 O 2 were involved in the VUV process. The operating parameters, such as Fe 2+ dosage and initial TMP contents, were evaluated and optimized. Up to 8 aromatic intermediates derived from hydroxylation, demethylation, carbonylation, and methylene group cleavage were identified by UPLC-QTOF-MS/MS technique, the possible pathways of TMP degradation were proposed. Finally, the acute and chronic toxicity of intermediates formed during TMP degradation in the VUV/Fe 2+ process were also evaluated.
研究领域:
环境科学
·
水处理技术
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毒理学
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 15
·期 1
·216
·
IF 4.967
Xinxin Wang,Xinyu Zu,Ting Wang,Yanan Zhao,Yan Liang,Xiaochen Wang,Qian Chai,Yunjuan Zhang,Hongzhong Chen,Hua Wang
Lactoferrin (LF) is an iron-binding glycoprotein with various biological activities that has been extensively used in food and medical applications. Several methods for detecting LF have been reported, but they still face challenges in terms of sensitivity and simplicity of detection. To achieve an accurate and efficient detection of LF, we developed a method for the determination of LF in lactoferrin supplements using carbon dots (CDs) fluorescent probes. The N, S-doped PPI carbon dots (N, S-PPI-CDs) were prepared using a protein (peanut protein isolate) and cysteamine as precursors. The prepared N, S-PPI-CDs exhibited intense blue fluorescence and good biocompatibility, while the fluorescence intensity of the N, S-PPI-CDs showed a good linear relationship with Fe2+/Fe3+concentration (0–2 μM). The N, S-PPI-CDs exhibited a high potential ability to rapidly detect Fe2+/Fe3+within 30 s, with a limit of detection (LoD) of 0.21 μM/0.17 μM. Due to the reversible binding of LF to Fe, the N, S-PPI-CDs showed a high sensitivity and selectivity for LF, with a limit of detection (LoD) of 1.92 μg/mL. In addition, LF was quantified in real sample LF supplements and showed a fluctuation in recovery of less than 2.48%, further demonstrating the effectiveness of the fluorescent N, S-PPI-CDs sensor.Keywords:N, S-PPI-CDs;fluorescence probe;biocompatibility;Fe2+/Fe3+detection;lactoferrin supplement detection
研究领域:
分析化学
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材料科学
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生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）