SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Wanying Zhu,Xin Shen,Chunhong Zhu,Bingzhi Li,Junli Hong,Xuemin Zhou
In this work, based on purifying the analysis system by magnetic separation, we constructed a turn-on fluorescent assay for highly sensitive detection of possible biomarkers, employing adenosine as the model target analyte. Aptamer labeled-carbon dots (Apt-CDs) was applied as fluorescence probes as well as selective recognition elements, while Fe 3 O 4 @polypyrrole (Fe 3 O 4 @PPY) was used as fluorescence quenching and magnetic separating materials for system purification. In absence of adenosine, the Apt-CDs were attached to the surface of PPY through π-π stacking and hydrophobic interaction and its fluorescence was quenched by Fe 3 O 4 @PPY. In presence of adenosine, the aptamer could specifically bind with adenosine to form a three dimensional Apt-CDs-adenosine complex and detach from PPY, leading to the fluorescence recovery of Apt-CDs. More importantly, with analysis system purification via twice convenient magnetic separations of free CDs and Apt-CDs-adenosine complex respectively, the detection limit could be reduced from 8 nmol L −1 to 0.15 nmol L −1 . This concept offers potential application for simple, rapid, cost-effective, and highly sensitive assay of biological samples.
研究领域:
生物分析化学
·
医学检测
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产品关联
DOI
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2020
·Vol. 106
·期 1
·165-174
·
IF 1.657
Feng Jinghua,Cai Yawen,Wang Xiangxue,Wang Xin,Zhu Mingyu,Fang Ming,Liu Zehua,Tan Xiaoli
Adsorbents with the combination of magnetic separation and removal performance are expected for reducing the adverse impact of nuclear pollution. In this study, the core–shell Fe 3 O 4 @polydopamine (Fe 3 O 4 @PDA) was successfully synthesized and used for removal of uranium (U(VI)) ion from aqueous solution. The abundant N-containing groups derived from PDA exist as the chelate sites for U(VI) and contribute greatly for U(VI) removal. Experimental results show that Fe 3 O 4 @PDA (56.39 mg g –1 ) exhibits greater sorption capacity for U(VI) removal compared with the pure Fe 3 O 4 (9.17 mg g –1 ). The sorption isotherm can be well fitted with Freundlich model and the sorption process is endothermic and spontaneous. The removal of U(VI) can be explained by the complexation of U(VI) with –NH–, –NH 2 and C–O in the surface of Fe 3 O 4 @PDA by X-ray photoelectron spectroscopy (XPS) analysis.
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
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Shuyi Huang,Shibo Jiang,Hongwei Pang,Tao Wen,Abdullah M. Asiri,Khalid A. Alamry,Ahmed Alsaedi,Xiangke Wang,Suhua Wang
Magnetic nanomaterials are promising adsorbents for their superior performance in the elimination of radioactive ions from aqueous solution. In this study, a new kind of fluorescent carbon dots were successfully introduced into MnFe 2 O 4 to fabricate magnetic polyethyleneimine-functionalized carbon quantum dots/MnFe 2 O 4 (PECQDs/MnFe 2 O 4 ) nanocomposites by a simple hydrothermal method, which combined the fluorescent characteristic of CQDs, adsorption capacity of polyethyleneimine and magnetic separation property of MnFe 2 O 4 . Detailed characterization certified the formation of nanohybrid composites and its integrating advantages of fluorescence property and magnetism separation, which demonstrated its potential in immobilizing U(VI) and monitoring the adsorption process simultaneously in wastewater. The obtained PECQDs/MnFe 2 O 4 was applied to remove U(VI) from aqueous solution and showed superior construction stability and adsorption capacity of 194 mg/g. Moreover, the kinetic and thermodynamic results suggested that the immobilization of U(VI) was an endothermic and spontaneous multilayer adsorption dominated process. In the end, the cation exchange and interaction between uranyl ions and abundant functional groups (i.e., NH 2 , OH and COOH) on PECQDs/MnFe 2 O 4 were revealed to be responsible for the enhanced adsorption of U(VI), which was realized by forming outer-sphere surface complexes in the removal process. This study proposed an ultrafast-kinetics and high-efficiency adsorbent for U(VI) sequestration, which has a great application potential due to its outstanding recycling performance.
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
JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Zenan Hu,Junjie Zhou,Yongjian Ai,Lei Liu,Li Qi,Ruihang Jiang,Hongjie Bao,Jingting Wang,Jianshe Hu,Hong-bin Sun,Qionglin Liang
A magnetically separable 2D Rh/Fe 3 O 4 /g-C 3 N 4 -N catalyst has been synthesized for the catalytic transfer hydrogenation of nitroarenes to afford corresponding anilines. The highly dispersed Rh nanoparticles are the dominant active species. The reaction is second order for rhodium according to the kinetic study, and this means the activity of different Rh-containing catalyst can be precisely predicted and the active site contains two adjoining rhodium atoms. The strong interaction between Rh and Fe 3 O 4 contributes to the catalytic performance, therefore the obtained Rh/Fe 3 O 4 /g-C 3 N 4 -N catalyst exhibits excellent catalytic activity and chemoselectivity for the reduction of various nitroaromatics, and the turnover frequencies (TOF) can reach as high as 12,666 h −1 for 4-nitrophenol. Moreover, this catalytic system is environmentally friendly because of its green solvent water and harmless byproducts (H 2 O and N 2 ), and the catalyst shows outstanding stability and recyclability with at least 12 cycles.
研究领域:
化学
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材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Long Kong,Ruixin Yan,Min Liu,Junqing Xu,Takeshi Hagio,Ryoichi Ichino,Liang Li,Xinde Cao
In this study, β-Cyclodextrin (CD) modified Fe 3 S 4 nanomaterials were synthesized by a one-step facile strategy and investigated for the removal of Cr(VI). The resulted CD-Fe 3 S 4 exhibited enhanced removal efficiency toward Cr(VI) than bared Fe 3 S 4 with a maximum capacity of 220.26 mg·g -1 as the molar ratio of CD-to-Fe 3 S 4 at 0.2. The effective performance of CD-Fe 3 S 4 toward Cr(VI) could well maintain under oxic conditions and a wide pH range of aqueous solution. A high selectivity for Cr(VI) was achieved in the presence of coexisting cations and anions. More significantly, a single treatment step of CD-Fe 3 S 4 effectively removed chromium from actual electroplating wastewater to the detection limit of 0.004 mg·L -1 that far below the WHO limitation of Cr (VI) (<0.05 mg·L -1 ) combing with the rapid magnetic separation without adjusting the pH value of wastewater at 7. The effective removal of Cr (VI) by CD-Fe 3 S 4 involved a complex process of surface adsorption/reduction, and solution homogenous reduction and subsequent sequestration of Cr(III) achieving the effective removal of aqueous total Cr. The superior Cr (VI) removal capability and facial separation of CD-Fe 3 S 4 attained its prominent potential application as an effective material for the Cr(VI) removal.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 19
·6787
·
IF 4.6
Yuan Zhao,Qianlong Fan,Yinhua Liu,Shuwen Wang,Xudong Guo,Liujia Guo,Mengcheng Zhu,Xuan Wang
In order to separate the colloidal in high-turbidity water, a kind of magnetic composite (Fe3O4/HBPN) was prepared via the functional assembly of Fe3O4and an amino-terminal hyperbranched polymer (HBPN). The physical and chemical characteristics of Fe3O4@HBPN were investigated by different means. The Fourier Transform infrared spectroscopy (FTIR) spectra showed that the characteristic absorption peaks positioned at 1110 cm−1, 1468 cm−1, 1570 cm−1and 1641 cm−1were ascribed to C–N, H–N–C, N–H and C=O bonds, respectively. The shape and size of Fe3O4/HBPN showed a different and uneven distribution; the particles clumped together and were coated with an oil-like film. Energy-dispersive spectroscopy (EDS) displayed that the main elements of Fe3O4/HBPN were C, N, O, and Fe. The superparamagnetic properties and good magnetic response were revealed by vibrating sample magnetometer (VSM) analysis. The characteristic diffraction peaks of Fe3O4/HBPN were observed at 2θ = 30.01 (220), 35.70 (311), 43.01 (400), 56.82 (511), and 62.32 (440), which indicated that the intrinsic phase of magnetite remained. The zeta potential measurement indicated that the surface charge of Fe3O4/HBPN was positive in the pH range 4–10. The mass loss of Fe3O4/HBPN in thermogravimetric analysis (TGA) proved thermal decomposition. The –C–NH2or –C–NH perssad of HBPN were linked and loaded with Fe3O4particles by the N–O bonds. When the Fe3O4/HBPN dosage was 2.5 mg/L, pH = 4–5, the kaolin concentration of 1.0 g/L and the magnetic field of 3800 G were the preferred reaction conditions. In addition, a removal efficiency of at least 86% was reached for the actual water treatment. Fe3O4/HBPN was recycled after the first application and reused five times. The recycling efficiency and removal efficiency both showed no significant difference five times (p> 0.05), and the values were between 84.8% and 86.9%.Keywords:hyperbranched polymer;Fe3O4;coating;magnetic separation;water treatment
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Environmental Science-Advances
·
2022
·Vol. 2
·期 1
·98-106
·
IF 0
Jingzhen Zhang,Qian Zheng,Chen Chen,Xiangcheng Zhang,Xiaoyan Guo,Mingce Long
A self-maintainable decentralized water treatment system is appealing, while avoiding chemical addition is the prerequisite to realize it. As a widely used chemical in advanced oxidation processes (AOPs), H2O2 can be produced via photocatalysis. However, there remain challenges to use the photocatalytically produced H2O2 for water purification in a continuous operation, which requires that the produced H2O2 solution has no impurity and the catalyst powder is easily separable. We realized this by photocatalytic H2O2 production over magnetic separable photocatalytic microspheres through a sequencing batch process and coupling with ultraviolet C (UVC)/H2O2 for micropollutant removal via a flow-through operation. The photocatalysts were synthesized by in situ growth of a resorcinol–formaldehyde (RF) copolymer on Fe3O4@SiO2 microspheres, which can convert earth-abundant water and air into H2O2 under visible light irradiation. A clean H2O2 solution was produced at 100 μmol h−1 g−1 over magnetic photocatalysts and separated by using an external magnetic field. The on-site utilization of the obtained H2O2 solution was realized via UV light irradiation. This work provides a rational design of easily separable photocatalysts for H2O2 production, and offers insights for development of water purification processes with zero chemical addition and maintenance.
研究领域:
环境科学
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材料科学
·
化学工程
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DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Jiang-Bo Huo,Lei Xu,Jia-Cheng E. Yang,Hao-Jie Cui,Baoling Yuan,Ming-Lai Fu
Water stable Fe 3 O 4 @ZIF-8 composites were successfully fabricated by a facile modification. The composites were characterized by powder XRD, SEM, TEM and BET surface areas measurement. The results showed that as-obtained Fe 3 O 4 @ZIF-8 composites possess core-shell structures (Fe 3 O 4 as core and ZIF-8 as shell) with a high surface area (1133 m 2 g −1 ). The composites were also evaluated for adsorption of As(III) from solution. Langmuir model could be suitable to express the adsorption isotherm, indicating that the uptake of As(III) on Fe 3 O 4 @ZIF-8 is monolayer adsorption with maximum capacity being 100 m 2 g −1 . Thermodynamics data revealed that the adsorption followed a spontaneous, endothermic and entropy increase process. Batch adsorption experiments demonstrated that the adsorption kinetics fit pseudo-second-order better with correlation coefficient R 2 of 0.9881. The effects of anions such as chloride, nitrate, carbonate, phosphate and sulfate on the removal of As(III) were also examined. The results indicated that ordinary anions would not hinder adsorption of As(III) except that the carbonate and phosphate anions could compete with As(III) for adsorptive sites on the adsorbent. This research showed Fe 3 O 4 @ZIF-8 is a promising composite in practical application as it can be easily separated by magnetism after used in the water treatment with efficient removal of As(III) from aqueous solution.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 71
·40804-40812
·
IF 2.936
Junhui Liu,Long Kong,Xueqiong Huang,Min Liu,Liang Li
In this study, magnetic sulfur-doped Fe3O4 nanoparticles (Fe3O4:S NPs) were applied as adsorbents for the removal of As(V). Fe3O4:S NPs were fabricated by a two-step route, which included low-temperature mixing and high-temperature sintering. The as-prepared Fe3O4:S NPs could effectively remove As(V) under a wide pH range of 2–10 and presented a high As(V) adsorption capacity of 58.38 mg g−1, which was much better than undoped Fe3O4 nanoparticles (20.24 mg g−1). Adsorption experiments exhibited a pseudo-second-order model of adsorption kinetics and a Langmuir isotherm model of adsorption isotherms. Additionally, the coexisting ions such as NO3−, SO42−, and CO32− had no significant effect on As(V) adsorption and the adsorbent worked well in actual smelting wastewater. XPS and FTIR spectra of Fe3O4:S NPs before and after As(V) adsorption showed that Fe–OH groups played a significant role in the adsorption mechanisms. Moreover, the magnetic Fe3O4:S NPs adsorbents after adsorption could be rapidly separated from wastewater with an external magnetic field. Therefore, Fe3O4:S NPs could be an ideal candidate for the removal of As(V) from water.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 319
·期 3
·737-748
·
IF 1.186
Feng Sheng,Ni Ziqiu,Feng Shanshan,Zhang Zhihui,Liu Shuguang,Wang Runbai,Hu Jiawei
In this study, the UiO-66/Fe 3 O 4 /GO composite was prepared by one step method for removal of cesium ions (Cs + ) in water and exhibited excellent adsorption capacity for Cs + (62.07 mg g −1 ), which can be attributed to the size compatibility of nanosized cavities and the addition of GO. As supporting matrix, GO decreased particle aggregation and increased the surface area of the adsorbent. The composite had good acid and alkali resistance, thermal stability, rapid adsorption rate and can be separated from water by magnetic separation rapidly.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MICROBIOLOGICAL METHODS
·
2018
·
IF 1.701
Jinjuan Qiao,Xiangying Meng,Yufang Sun,Qian Li,Ronglan Zhao,Yun Zhang,Jiaqi Wang,Zhengjun Yi
Accurate and rapid identification of methicillin-resistant Staphylococcus aureus (MRSA) is of important clinical significance. In this study, a novel aptamer-based fluorometric assay was developed for detection of MRSA in clinical samples by coupling with immunomagnetic separation . The S. aureus cells in clinical specimens were enriched by magnetic separation. Following lysis by staphylococcal lysin , the PBP2a proteins were released from S. aureus cells and detected by the aptamer-based fluorometric assay. Without lengthy period of bacteria cultivation in the traditional susceptibility testing, this test has an overall testing time of only 2 h with the detection limit of 2.63 × 10 3 and 1.38 × 10 3 CFU/mL in PBS and spiked nasal swab, respectively. Since it is simple, rapid and sensitive, this method could be used for the detection of MRSA in various clinical samples.
研究领域:
医学检验
·
微生物学
·
临床诊断
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Dong Dong,Shujun Zhang,Weiwei Huo,Ming Zhao,Jun Li,Guohua Dong,Yingnan Zhao,Min Zhu,Zhichun Shi
Antibiotic contamination remains a challenge for wastewater treatment . In this work, a hyper-cross-linked polymer (DHCP-TP 3 ) with a dual nitrogen-rich structure was synthesized by a one-step facile Friedel-Crafts reaction, and a Fe 3 O 4 @DHCP-TP 3 composite was prepared by postmodification with the introduction of magnetic iron oxide nanoparticles (Fe 3 O 4 NPs), which were applied to the adsorption of tetracycline (TC) from aqueous solution. The TC adsorption capacities of the DHCP-TP 3 and Fe 3 O 4 @DHCP-TP 3 composites reached 519.65 and 893.85 mg·g −1 , respectively, and the adsorption processes for both followed the pseudo-second-order kinetic model and the Freundlich isothermal model. Fe 3 O 4 @DHCP-TP 3 can achieve adsorption equilibrium for TC within 200 min, and also exhibits excellent regeneration and magnetic separation capabilities. Complexation, hydrogen bonding, cation exchange and π-π interactions were the main adsorption mechanisms. Moreover, Fe 3 O 4 @DHCP-TP 3 could also adsorb other pollutants, including sulfadiazine (SD), sulfamethoxazole (SMZ), methyl orange (MO), methylene blue (MB), 2,4-dichlorophenol (2,4-DCP), and iodine (I 2 ). The brief synthesis, high adsorption capacity and easy regeneration certified that HCPs were ideal adsorbents for removing pollutants from wastewater.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）