EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Hong-Hui Shu,Hui-Qin Zhang,Sheng-Li Han,Yun Liu,Xiu-Qin Fang,Cheng-Mei Liu
Petroleum-derived polythioureas (PTUs) are typical functional polymers that have been applied as essential materials in the optoelectric and environmental fields. The design and preparation of sustainable PTUs are the current focus in this field. In the present study, we first proposed that PTUs can be prepared from bisfuran diamines by solution polymerisation with CS 2 without any catalyst. The diamine monomers were prepared from renewable furfurylamine, which enabled the final PTUs to be sustainable. The highest molecular weight of the resulting PTUs was 86.64 kg/mol, with a polydispersity of 1.32. The glass transition temperature ( T g ) of PTU can be tuned by changing the spacer of monomers. All synthesised PTUs showed excellent thermal stability, and the char yield at 800 °C was > 40 %. Attractively, these PTUs are excellent Hg 2+ ion capturers due to their thiourea structure.
研究领域:
材料科学
·
环境科学
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高影响因子
ANALYST
·
2012
·Vol. 137
·期 22
·5398-5402
·
IF 4.23
Qun-bo Mei,Yuan-hui Guo,Bi-hai Tong,Jie-Na Weng,Bin Zhang,Wei Huang
A new phosphorescent chemosensor for Hg2+ and acetonitrile (MeCN) based on iridium(III) complex Ir(dpp)2(dtc) (Ir1, dppH = 4,6-diphenylpyrimidine, dtcH = diethyl dithiocarbamic acid) was realized. Upon addition of a tetrahydrofuran (THF) solution of Hg2+, the dichloromethane (DCM) solution of Ir1 gave a visual color change and significant fluorescent quenching. When MeCN was added, a new fluorescent emission emerged, which constituted a selective MeCN phosphorescent chemosensor. Complex Ir1 has been developed as an AND logic gate with Hg2+ and MeCN as inputs.
研究领域:
分析化学
·
配位化学
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Dehong Bai,Ziyu Xue,Peiqing Guo,Mingzhu Qiu,Xuefang Lei,Yujin Li,Chengjie Ma,Dongxia Zhang,Xibin Zhou
Due to the harm of metal mercury to the environment and the human body, there is an urgent need for exploring novel, simple, and reliable methods for the detection of Hg 2+ . Herein, a colorimetric method is proposed for the determination of Hg 2+ based on the analyte inducing the aggregation of Glutathione-modified gold nanoflowers (GSH-Au NFs) with activated peroxidase-mimicking activity. Briefly, highly dispersed GSH-Au NFs show negligible enzyme-like activity in water. When Hg 2+ is added, GSH-Au NFs would aggregate rapidly for the interaction of Hg 2+ with the carboxyl and amine groups of GSH. And the aggregates exhibit high peroxidase-mimicking catalytic activity and can catalyze the color reaction of 3, 3′, 5, 5′-tetramethylbenzidine (TMB) in the presence of H 2 O 2 . Based on these phenomena, an ultrasensitive colorimetric detection method of Hg 2+ has been developed. The linear range of this method is 10–300 nM and the detection limit is down to 3.9 nM, which is much lower than the standard value specified by the US EPA. The accuracy of the method has been verified in water samples, which reveals its great potential in environmental monitoring.
研究领域:
环境科学
·
纳米生物学
·
分析化学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Bing Zhang,Hongyun Meng,Xue Wang,Honghong Chang,Wenlong Wei
Mercuric ion (Hg 2+ ) as one kind of environmental pollutants has attracted more and more attentions due to its persistence, mobility and biological enrichment. In this study, a novel photoelectrochemical biosensor for Hg 2+ detection was constructed based on dye sensitization effect induced by Y-shaped DNA transformation as signal amplification strategy. Firstly, graphene oxide-ZnO-CdS nanohybrid (GO-ZnO-CdS) as photoelectric material was synthesized by simple hydrothermal method, and was employed to modify ITO electrode. Secondly, Y-shape DNA was labeled by Au NPs in the solution, and which crosslinked on the surface of GO-ZnO-CdS modified ITO electrode by carbodiimide coupling method, which resulted in the excitation energy transfer (EET) effect between Au NPs and CdS. Finally, in the presence of Hg 2+ , the structure of DNA on the modified electrode changed from Y-shape into hairpin accompanying the proximity of dye molecule based on T-Hg 2+ -T, which eliminated EET effect and triggered dye sensitization effect for enhancing photocurrent response. Under optimal conditions, the photocurrent linearly increased with the increasing of Hg 2+ levels in the range of 5 pM − 500 pM with the detection limit of 1:5 pM(LOD = 3σ blank / s ). More importantly, the developed biosensor showed the advantages of acceptable selectivity, repeatability and stability.
研究领域:
环境科学
·
生物传感
·
材料科学
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2014
·
IF 2.129
Na Li,Jiang-Kun Dai,Hong-Tao Du,Mao-Sen Yuan,Ji-Wen Zhang,Jun-Ru Wang
A novel sensing system based on the β -carboline core has been designed and synthesized for Hg 2+ detection in water. We have demonstrated that a straight forward methodology can provide rapid, sensitive and selective recognition (cross-contamination experiments) for Hg 2+ over a wide pH range. The vivid fluorescence change from blue to colorless can be clearly discriminated by the naked eye. Furthermore, there is a good negative correlation between the fluorescent intensity and the concentration of Hg 2+ in the range 1.0 × 10 −6 M–7.0 × 10 −6 M. β -Carboline as a fluorophore synthesized via this route also provides a new strategy for the design of novel fluorescence probes and fluorochromes.
研究领域:
分析化学
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环境科学
·
材料科学
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DOI
PubMed
高影响因子
Materials
·
2018
·Vol. 11
·期 11
·2232
·
IF 2.467
Jiahui Wang,Hao Zhang,Ruifang Guan
Dual-emission nanosensor for Hg2+detection was prepared by coupling CA-AEAPMS on the surface of RBS-doped modified silica microspheres. The CA-AEAPMS was synthesized by usingN-(β-aminoethyl)-γ-aminopropyl methyldimethoxysilane (AEAPMS) and citric acid as the main raw material. The obtained nanosensor showed characteristic fluorescence emissions of Rhodamine B (red) and CA-AEAPMS (blue) under a single excitation wavelength (360 nm). Upon binding to Hg2+, only the fluorescence of CA-AEAPMS was quenched, resulting in the ratiometric fluorescence response of the dual-emission silica microspheres. This ratiometric nanosensor exhibited good selectivity to Hg2+over other metal ions, because of the amide groups on the surface of CA-AEAPMS serving as the Hg2+recognition sites. The ratio of F450/F580linearly decreased with the increasing of Hg2+concentration in the range of 0 to 3 × 10−6M, and a detection limit was as low as 97 nM was achieved. Then, the addition of three thiol-containing amino acids (Cys, Hcy, GSH) to the quenched fluorescence solution with Hg2+can restore the fluorescence, and the detection limits of the three biothiols (Cys, Hcy, GSH) are 0.133 μM, 0.086 μM, and 0.123 μM, respectively.Keywords:dual-emission;silica microspheres;fluorescence
研究领域:
分析化学
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环境科学
·
生物医学工程
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DOI
PubMed
高影响因子
ACS Sensors
·
2016
·
IF 0
Ningyi Chen,Yujie Zhang,Hongyu Liu,Xiaoxia Wu,Yonglong Li,Lijing Miao,Zheyu Shen,Aiguo Wu
Mercury ion (Hg2+) arising from a variety of natural sources and industrial wastes has been widely recognized as one of the most hazardous pollutants. It is very important to develop highly selective and sensitive probe for rapid detection of Hg2+ in aquatic ecosystems. Here we propose a new strategy for high-performance colorimetric detection of Hg2+, i.e., anti-etching of silver nanoprisms (AgNPRs). In the absence of Hg2+, the AgNPRs can be etched by I– inducing an obvious color change from blue to red. However, in the presence of Hg2+, the formation of Ag–Hg nanoalloy can protect the AgNPRs from I– etching and the color remains blue. This mechanism is verified by UV–vis, TEM, DLS, and EDS. Our AgNPRs-based colorimetric probe exhibits excellent selectivity for Hg2+. The limit of detection (LOD) of Hg2+ is 30 nM by the naked eye and 3 nM by UV–vis spectroscopy, which is lower than the mercury toxic level defined by the U.S. Environmental Protection Agency (10 nM). A good linear relationship (R2 = 0.993) between the wavelength shift and Hg2+ concentrations indicates that our probe can be used for the quantitative assay of Hg2+. The results of Hg2+ detection in real environmental samples indicate the feasibility and sensitivity of our probe for application in complicated environmental samples.
研究领域:
环境科学
·
分析化学
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DOI
POLYMER
·
2023
·
IF 4.6
Chaoji Xiong,Hao Wang,Zhengbiao Zhang,Kun Liang,Chunhua Wu,Wei Wu,Xiaoping Rao,Qian Chen
Recently the research on the materials for removal of heave metals is surging rapidly. Here we have studied four triazine-based sulfur-containing polymers with different linkers, namely PDT1, PDT2, EDT1, and EDT2. They have been successfully synthesized by the nucleophilic substitution reaction of cyanuric chloride with propane-1,3-dithiol ( PDT1 and PDT2 ) and ethane-1,2-dithiol ( EDT1 and EDT2 ) in different ratios. The physical and chemical properties of these polymers were characterized by scanning electron microscopy, energy dispersive spectroscopy , Fourier transform infrared spectroscopy , porous structure analysis and X-ray photoelectron spectroscopy. The optimized adsorption condition was established by examining dosing, co-existing substances, contact time, concentration, temperature and pH values. The adsorbing properties, which was mainly described by the pseudo-second-order kinetic and Langmuir isothermal model, indicated that the sorption of Hg 2+ was the chemical adsorption . The maximum Hg 2+ sorption capacities of PDT1 , PDT2 , EDT1 and EDT2 were 1440.97 mg g −1 , 715.99 mg g −1 , 237.87 mg g −1 and 181.48 mg g −1 , respectively. Thermodynamically, the adsorption of Hg 2+ by the adsorbent is a spontaneous process. Cyclic experiments demonstrated that all the adsorbents could be reused in five successive adsorption cycles without significant losses in performance. Our density functional theory calculations in combination with relevant experimental results revealed the coordination geometry of Hg and hence mercury-adsorbent chelation mechanism. These results suggested that triazine-based sulfur-containing polymers could be utilized as effective adsorbents for the removal of Hg 2+ from polluted water.
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高影响因子
JOURNAL OF FLUORESCENCE
·
2022
·Vol. 32
·期 5
·1755-1759
·
IF 2.525
Nie Jia,Xu Tong,Liu Qian,Yang Chun,Sun Xuping
Hg 2+ is one of the most toxic heavy metal ions that exist in the environment and it forms large numbers of toxic binary compounds. Accurate and rapid detection of the concentration of heavy metal ions is a prerequisite technology to achieve pollution control and prevention. Fluorescent probes have attracted extensive attention because of their high sensitivity, prominent precision, convenient and fast visualization of heavy metals. Herein, we report multi-layered graphitic carbon nitride via a simple thermopolymerization treatment as a very effectual fluorescent probe for sensitive and selective detection of Hg 2+ with a limit of detection as low as 1.14 nM.
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PubMed
高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 6
·1-12
·
IF 5.7
Zhang Shaobing,Yan Haidong,Li Hongni,Xu Tiantian,Li Hui,Wang Chengkun,Yang Zheng,Jia Xiaodan,Liu Xiangrong
Abstract Nitrogen-doped carbon dots (NCDs) have been constructed in which coal washing wastewater is used as carbon precursor, tryptophan is added for nitrogen doping and surface functional together with polyethylene glycol. The nitrogen doping and surface functional with electron rich groups resulted in excellent fluorescent properties regarding stability, reversibility, printability with high quantum yield which not only enable the NCDs as fluorescent ink for advanced message encryption, but also realize specific on-off-on fluorescent sensing of Hg 2+ and GSH as solution, hydrogel and filter paper sensors. The NCDs had a linear range of 0.01-100 μM and a detection limit of 6.27 nM (RSD 0.33%) for Hg 2+ and the NCDs@Hg 2+ had a linear range of 0.01–60 μM and a detection limit of 3.53 nM (RSD 1.53%) for GSH in sensing studies with aqueous solutions. In addition, with the low cytotoxicity and good biocompatibility NCDs have been successfully used for imaging Hg 2+ and GSH in living MG-63 cells. The presented NCDs recycle waste coal washing water into worthwhile material which can be implemented as promising anti-counterfeiting and message encryption candidates as well as effective Hg 2+ and GSH sensing, tracking and removing tools in complicated environmental and biological systems. Graphical Abstract
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 12
·17964-17976
·
IF 4.223
Chen Heng,Liu Fengjun,Cai Chenjian,Wu Hao,Yang Linjun
A novel adsorbent consisting of tannic acid (TA) immobilized on graphene oxide (GO) was proposed and used to remove Hg 2+ from desulfurization wastewater. The morphology and physicochemical properties of tannin-immobilized graphene oxide (TAIGO) were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The characterization results showed that TA was successfully immobilized on GO, and that new functional groups were introduced on TAIGO. The effects of contact time, adsorbent dose, pH, and ion components on removal efficiency were evaluated. The adsorption process was found to be complete within 15 min, and the removal efficiency increased with increasing adsorbent dosage. The pH value affected the protonation of TAIGO and the form of Hg 2+ in wastewater. High concentrations of Cl − and SO 3 2− hindered the adsorption performance, whereas SO 4 2− and cations had a negligible effect. In addition, the excellent economic benefits of TAIGO were analyzed in an economic evaluation, and the Hg 2+ removal efficiency remained at 88% after three recycles. A pseudo-second-order kinetic model ( R = 0.9995) was used to fit the adsorption process, and the oxygen-containing functional groups and chelation reaction played critical roles in adsorption. TAIGO is a low-cost adsorbent with high Hg 2+ removal efficiency and could be further used in practical desulfurization wastewater. Graphical abstract
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PubMed
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Ruyan Xie,Yaoyao Qu,Mingyu Tang,Jingqiang Zhao,Sophie Chua,Tingting Li,Fang Zhang,Andrew E. H. Wheatley,Fang Chai
The dual functional detection and removal of heavy ion metals by carbon dots has become an urgent matter of concern. Here, a unique fluorescent carbon dot-magnetic nanocomposite (Fe 3 O 4 /CDs) was prepared by hydrothermal methods for sensitive detection of Hg 2+ . The Fe 3 O 4 /CDs serve as fluorescent probes with higher selectivity and sensitivity for Hg 2+ , with the lowest detectable limit of 0.3 nM. Hg 2+ statically quenched the blue emission of Fe 3 O 4 /CDs, which can be restored in the presence of saturated EDTA solution. The utilization of Fe 3 O 4 /CDs was fulfilled by recovering their emission conveniently. The recovery of Hg 2+ in Chagan Lake water, tap water and drinks was calculated at 96.5 ~ 108.8%, which demonstrates the feasibility of the Fe 3 O 4 /CDs sensing system in natural samples. Notably, the Fe 3 O 4 /CDs can drive the effective removal of Hg 2+ from samples, which is of outstanding significance as a promising probe in environmental monitoring.
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高影响因子
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