SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Cui Wang,Qiangqiang Yang,Zhenhong Li,Kun-Yi Andrew Lin,Shaoping Tong
A magnetic carbon-coated Fe-C/N composite was synthesized by a simple impregnation method and its performance in activating persulfate (PS) to degrade Acid Red 73 (AR 73) was investigated. The as-prepared carbon-coated Fe-C/N hybrid material was characterized via transmission electron microscopy , Raman spectra, X-ray diffraction and X-ray photoelectron spectrum. Degradation experiments showed that 98.11% of AR 73 could be degraded in 10 min, but its COD was partly removed. The effects of initial reaction pH and temperature were also evaluated. An increase of temperature was beneficial for the removal of AR 73, while the increase of pH had an opposite result. The activation energy of the AR 73 degradation was determined to be 46.12 KJ/mol, smaller than those in relative literatures. The recycling test showed that the carbon-coated Fe-C/N composite had good stability. The mechanism study indicated that the catalytic performance of Fe-C/N was due to the synergistic effect between Fe 3 C and Fe 3 N, and the N doped carbon shell suppressed the rate of Fe leaching, thus enhancing its stability.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Ruowen Liang,Shuiguang Luo,Fenfen Jing,Lijuan Shen,Na Qin,Ling Wu
The effective treatment of pharmaceutical and personal care products (PPCPs) contained wastewater remains a significant but challenging task for the environmental restoration. In this work, a novel Pd@MIL-100(Fe) nanocomposite has been successfully fabricated via a facile alcohol reduction approach. The resulting Pd@MIL-100(Fe) has exhibited superior photoactivity toward degradation of three typical PPCPs, that is theophylline, ibuprofen and bisphenol A, under visible light irradiation ( λ ≥ 420 nm). Its photoactivity is also much higher than that of original-MIL-100(Fe). Combining with photoelectrochemical analyses, it could be revealed that the introduction of Pd NPs would minimize the recombination of photogenerated electron–hole pairs, thereby improving the photocatalytic performance. Furthermore, the effects of different kinds of metals, the loading amount of noble-metal, the pH value of reaction solution and initial concentration of hydrogen peroxide on the photocatalytic degradation activities have been measured in detail. In addition, a possible photocatalytic reaction mechanism has been investigated. This work has not only represented the first example of using the MOFs photocatalysts to remove the aqueous PPCPs, but also offered useful information on the fabrication of efficient MOF photocatalysts for environmental restoration.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ANALYST
·
2013
·Vol. 138
·期 16
·4526-4531
·
IF 3.969
Ya Li Liu,Xi Juan Zhao,Xiao Xi Yang,Yuan Fang Li
In this paper, a nanosized porous metal–organic framework, Fe-MIL-88NH2, was facilely prepared with a uniform octahedral shape by the addition of acetic acid, and for the first time was demonstrated to possess intrinsic peroxidase-like activity. Kinetic analysis and electron spin resonance measurements indicated that the catalytic behavior was consistent with typical Michaelis–Menten kinetics and follows a ping-pong mechanism. As a novel peroxidase mimic material, Fe-MIL-88NH2 shows the advantages of high catalytic efficiency, ultrahigh stability and high biocompatibility in aqueous medium compared with natural enzymes and other peroxidase nanomimetics. Here, Fe-MIL-88NH2 was used to quickly catalyze oxidation of the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H2O2 to produce a colored product, which provided a simple, sensitive and selective method for the colorimetric detection of glucose. Glucose could be linearly detected in the range from 2.0 × 10−6 to 3.0 × 10−4 M with a detection limit of 4.8 × 10−7 M, and the color variation for glucose response was also obvious by visual observation at concentrations as low as 2.0 × 10−6 M. More importantly, the colorimetric method could be successfully applied to the determination of glucose in diluted serum samples.
研究领域:
生物分析化学
·
纳米生物技术
·
酶模拟
·
临床检验
·
分子诊断
✓ 已验证
DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Jiao Li,Yuefan Wang,Chenxi Wang,Yilin Wang,Yaqi Yang,Jia Chen,Chunyan Li,Yixi Xie,Pengcheng Zhao,Junjie Fei
Baicalin obtained from natural plants has essential medical value, so the development of accurate and sensitive quantitative methods for it is one of the most important tasks. Here, the FeO X /Fe@porous carbon composite (Fe@C) was synthesized by solvothermal method and carbonized at different temperatures under an N 2 atmosphere, and an electrochemical sensor designed based on this material was applied to the accurate and rapid determination of baicalin. According to the results of physical and electrochemical characterization, Fe@C at different pyrolysis temperatures exhibited different morphologies and different electrochemical properties , while the Fe@C pyrolyzed at 800 °C had the optimum performance. Compared with NH 2 -MIL-88B, the pyrolysis greatly reduces the charge transfer internal resistance of the material and has a larger porosity and specific surface area, resulting in an eminent electrochemical signal for the detection of baicalin. The sensor Fe@C-800/GCE not only has a linear range of 4 nM–700 nM with a low limit of detection of 1.16 nM for the detection of baicalin, but also has outstanding repeatability, anti-interference and stability for the detection of baicalin in several natural plant samples and herbal medicines samples. This work presents several pyrolytic NH 2 -MIL-88B as electrochemical sensors for the detection of baicalin for the first time, providing a novel idea for the application of MOFs derivatives in environmental analysis.
研究领域:
分析化学
·
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Cheng Yang,Chengyong Shu,Zhuofan Gan,Chen Lai,Jijun Ma,Wei Tang,Yuping Wu
ZIF-8-derived Fe–N–S triple doping hollow-shell nanoparticles are prepared by the surface modification of SCN– ligands. Fe3+ ions are highly adsorbed on the SCN–-modified layer, forming a hollow-shell rhombic dodecahedron particle after pyrolysis. Doping extra S atom is found to be an effective method to increase the density of atomically dispersed active sites and boost their catalytic performance. The H-ZIF-Fe-SCN catalyst shows good bifunctional stability toward the oxygen reduction reaction and the oxygen evolution reaction in alkaline solution, the half-wave potential for the H-ZIF-Fe-SCN catalyst was recorded to be 0.889 V vs reverse hydrogen electrode, and a maximum power performance of 158.8 mW cm–2 was achieved when it was used as a cathode catalyst in zinc–air batteries.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 7
·930-941
·
IF 4.5
Tian Guodong,Duan Chao,Zhou Bingxu,Tian Chaochao,Wang Qiang,Chen Jiachuan
Membrane technology for wastewater remediation has aroused wide interest owing to its unique properties and potential applications. However, it remains challenging to explore green, efficient and robust membrane material and technique for complex wastewater treatment. Herein, we proposed using a simple electrospinning and in situ seeding method to fabricate a lignin-based electrospun nanofiber membrane (LENM) decorated with photo-Fenton Ag@MIL-100(Fe) heterojunctions for efficient separation of oil/water emulsions and degradation of organic dye. Thanks to the embedded lignin in LENM, an ultrahigh MIL-100(Fe) loading (53 wt %) with good wettability and high porosity was obtained. As a result, the hybrid Ag@MIL-100(Fe)/LENM exhibited excellent oil/water emulsions separation efficiency (more than 97%) without a compromise of water flux. Moreover, the hybrid membrane showed an excellent dye removal with degradation of 99% methylene blue within 30 min under illumination, which is attributed to a synergy of dye adsorption/enrichment and photo-Fenton catalytic degradation from Ag@MIL-100(Fe). Therefore, the lignin-based photo-Fenton hybrid membrane can lay the foundation for the preparation and application of green, sustainable and versatile membrane materials and technologies for efficient complex wastewater remediation.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
·
水处理技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Baicheng Yuan,Xinyi Huang,Shaojinlin Yang,Yi Yang,Zhihong Lin,Raphael Semiat,J. Paul Chen
Heavy metal contamination has become one of the greatest global environmental problems. In this study, a magnetic calcium-alginate hydrogel-sphere encapsulated with Fe–Mn–Zr ternary-metal composite (MCHETC) was prepared through a combined co-precipitation and extrusion approach and used for the adsorption of heavy metals in aqueous solutions. The active sites were dispersed in the MCHETC, which can be separated by the magnetic force for the ease in operation. Above 80% of ultimate adsorption was completed at a contact time of 5 h. The copper uptake history was well described by the intraparticle surface diffusion model, suggesting a multi-step process for the adsorption. The optimum pH for adsorption was 4; the maximum adsorption capacity was 103.1 mg-Cu/g. The adsorption capability well remained after the 5 adsorption–desorption cycles and the copper could be recovered. Furthermore, the adsorbent performed well in the nature water spiked with copper ions. The mechanism studies illustrated that the adsorption was mainly controlled by the ion-exchange reaction. This study demonstrated that the MCHETC adsorption technology may be used for heavy metal removal and recovery with higher efficacy.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Jingli Ren,Yutong Liu,Weimin Cao,Liyang Zhang,Fen Xu,Juan Liu,Yubo Wen,Jian Xiao,Lei Wang,Xiaoxiong Zhuo,Junfeng Ji,Yuanyuan Liu
Sediment-associated Fe(II) is a critical reductant for immobilizing groundwater contaminants, such as Cr(VI). The reduction reactivity of sediment-associated Fe(II) is dependent on its binding environment and influenced by the biogeochemical transformation of other elements (i.e., C, N and Mn), challenging the description and prediction of the reactivity of Fe(II) in natural sediments. Here, anaerobic batch experiments were conducted to study the variation in sediment-associated Fe(II) reactivity toward Cr(VI) in natural sediments collected from an intensive agricultural area located in Guangxi, China, where nitrate is a common surface water and groundwater contaminant. Then, a process-based model was developed to describe the coupled biogeochemical processes of C, N, Mn, Fe, and Cr. In the process-based model, Cr(VI) reduction by sediment-associated Fe(II) was described using a previously developed multirate model, which categorized the reactive Fe(II) into three fractions based on their extractabilities in sodium acetate and HCl solutions. The experimental results showed that Fe(II) generation was inhibited by NO 3 - and/or NO 2 − . After NO 3 − and NO 2 − were exhausted, the Fe(II) content and its reduction rate toward Cr(VI) increased rapidly. As the Fe(II) content increased, the three reactive Fe(II) fractions exhibited approximately linear correlations with aqueous Fe(II) concentrations ( C F e 2 + ), which was probably driven by sorptive equilibrium and redox equilibrium between aqueous and solid phases. The model results indicated that the reaction rate constants of the three Fe(II) fractions ( k n ) significantly increased with incubation time, and log( k n ) correlated well with C F e 2 + [ log ( k 1 ) = 2.84 C F e 2 + − 0.17 , log ( k 2 ) = 5.90 C F e 2 + − 2.49 and log ( k 3 ) = 3.09 C F e 2 + − 3.37 ]. The numerical model developed in this study provides an applicable method to describe and predict Cr(VI) removal from groundwater under dynamic redox conditions .
研究领域:
环境科学
·
地球化学
·
水文地质学
·
生物地球化学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 2
·1-9
·
IF 5.833
Senosy Ibrahim Abdelhai,Zhang Xin-Zhong,Lu Zhi-Heng,Guan Xiao-Yu,Yang Zhong-Hua,Li Jian-Hong,Guo Hao-Ming,Abdelrahman Talat Mahmoud,Mmby Mohamed,Gbiliy Asmaa
Fe 3 O 4 @MIL-100 (Fe)/PEI are used for the first time as an adsorbent material for the extraction of pesticide residues (epoxiconazole, flusilazole, tebuconazole, and triadimefon) from food matrices. The adsorbent proposed (Fe 3 O 4 @MIL-100(Fe)/PEI) was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), thermogravimetric (TG) analysis, and vibrating sample magnetometer (VSM) techniques to evaluate the properties of the sorbent. Then, the Fe 3 O 4 @MIL-100 (Fe)/PEI was employed for the quantification of the four triazole fungicides in fruits and vegetables (apple, orange, tomato, cabbage, and cucumber) using HPLC-UV for separation and detection. During the extraction process, the main parameters such as amount of adsorbent, extraction time, pH value, ionic strength, eluting solvent, and eluting volume were optimized. Under the optimum conditions, good linearity of this method was observed for all analytes, with correlation coefficients ( R 2 ) ≥ 0.9908. The limits of detection (LODs) ranged from 0.021–3.04 μg kg −1 . The extraction recoveries of the four triazole fungicides varied from 73.9 to 109.4% with relative standard deviations (RSD) in the range 0.5 to 6.2%. Compared with other MOFs, the modification of Fe 3 O 4 @MIL-100 (Fe) with PEI shows high efficient adsorption due to the combined benefits of MIL-100 (Fe) and PEI. The material is easily synthesized, has good stability, and is of low cost.
Graphical abstract
研究领域:
分析化学
·
食品安全
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2014
·
IF 2.063
Jianrong Li,Jinsheng Chen,Yanke Yu,Chi He
The Fe–Mn–Ce/CP catalyst prepared by the incipient-wetness impregnation method was investigated for elemental mercury (Hg 0 ) removal in simulated coal-fired flue gas . The incorporation of Fe could remarkably enhance the SO 2 -resistance of Fe–Mn–Ce/CP catalyst at low temperature, and the existence of water vapor had negative impact on Hg 0 removal efficiency. More than 95% of Hg 0 could be removed at 100 °C under the conditions of 60 ppm HCl, 3% O 2 ( v/v ), 5% H 2 O ( v/v ) and 400 ppm SO 2 . Hg-TPD results indicated that Hg 0 adsorption amount decreased after the addition of H 2 O or SO 2 . The XPS results revealed that the incorporation of Fe could enhance the contents of high valence Mn x + (i.e., Mn 3+ /Mn 4+ ) and Ce 3+ species in the composite catalysts, which are favorable for the oxidation process of elemental mercury. The surface characteristics were not the primary factor determining the catalytic activity . Overall, the catalytic performance of the Fe–Mn–Ce/CP catalyst was closely related to the Fe 3+ state, high ratios of (Mn 4+ + Mn 3+ )/Mn 2+ and high content of not fully coordinated cerium species.
研究领域:
环境催化
·
大气污染防治
·
能源化学工程
·
材料科学与工程
·
表面化学
·
烟气净化技术
✓ 已验证
DOI
高影响因子
Frontiers of Materials Science
·
2023
·Vol. 17
·期 2
·1-11
·
IF 2.7
Xiao He,Xue Shoufeng,Fu Zimei,Zhao Man,Zhang Li,Zhang Junming,Wu Haishun,Jia Jianfeng,Yang Nianjun
Developing high-activity and low-cost catalysts is the key to eliminate the limitation of sluggish anodic oxygen evolution reaction (OER) during electrocatalytic overall water splitting. Herein, Ni–Fe/black phosphorous (BP) composites are synthesized using a simple three-electrode system, where exfoliation of bulky BP and synthesis of NiFe composites are simultaneously achieved. Under light illumination, the optimized Ni–Fe/BP composite exhibits excellent photoelectrocatalytic OER performance (e.g., the overpotential is 58 mV lower than a commercial RuO 2 electrocatalyst at a current density of 10 mA·cm −2 ). The electron transfer on this composite is proved to follow a Ni–BP–Fe pathway. The electronic structure of this Ni–Fe/BP composite is effectively regulated, leading to optimized adsorption strength of the intermediate OH* and improved intrinsic activity for the OER. Together with active sites on the support, this Ni–Fe/BP composite possesses abundant electrochemical active sites and a bug surface area for the OER. The introduction of light further accelerates the electrocatalytic OER. This work provides a novel and facile method to synthesize high-performance metal/BP composites as well as the approaches to reveal their OER mechanisms.
研究领域:
电化学
·
催化
·
材料科学
·
纳米技术
·
能量转换
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Dekang Huang,Yanping Luo,Shaohui Li,Mingkui Wang,Yan Shen
To realize a large-scale application of fuel cells, it is highly desirable to develop noble metal-free electrocatalysts for oxygen reduction reaction (ORR). Herein, a highly active electrocatalyst is synthesized by impregnating in situ generated iron(III)-1,10-phenanthroline complex on commercially high specific surface area carbon blacks and subsequent pyrolysis at high temperature. High ORR limiting current density (5.79 mA cm −2 ) and positive half-wave potential (0.859 V versus RHE) over this electrocatalyst with a mass loading of 0.2 mg cm −2 can be achieved in 0.1 M KOH solution, which are very comparable with the benchmark Pt/C electrocatalyst. Detailed investigations have revealed the existence of nitrogen doped carbon (N-C), nitrogen coordinated to Fe (Fe-N), and Fe@Fe 3 O 4 core-shell nanoparticles in this composite electrocatalyst. The high activity of this electrocatalyst is attributed to the synergistic effect among them.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）