ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2019
·
IF 7.149
Jiyuan Jin,Shujuan Zhang,Bingdang Wu,Zhihao Chen,Guoyang Zhang,Paul G. Tratnyek
Quinones are important electron shuttles as well as micropollutants in the nature. Acetylacetone (AA) is a newly recognized electron shuttle in aqueous media exposed to UV irradiation. Herein, we studied the interactions between AA and hydroquinone (QH2) under steady-state and transient photochemical conditions to clarify the possible reactions and consequences if QH2 and AA coexist in a solution. Steady-state experimental results demonstrate that the interactions between AA and QH2 were strongly affected by dissolved oxygen. In O2-rich solutions, the phototransformation of QH2 was AA-independent. Both QH2 and AA utilize O2 as the electron acceptor, but in O2-insufficient solutions, AA became an important electron acceptor for the oxidation of QH2. In all cases, the coexistence of AA increased the phototransformation of QH2, whereas the decomposition of AA in O2-saturated and oversaturated solutions was inhibited by the presence of QH2. The underlying mechanisms were investigated by a combination of laser flash photolysis (LFP) and reduction potential analysis. The LFP results show that the excited AA serves as a better electron shuttle than QH2. As a consequence, AA might regulate the redox cycling of quinones, leading to significant effects on many processes, ranging from photosynthesis and respiration to photodegradation.
研究领域:
环境科学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-7
·
IF 4.58
Huang Wei,Zhang Ting,Hu Xiaoya,Wang Yang,Wang Jianmin
A porous carbon material doped with an iron species (Fe/PC) was prepared by carbonizing a mixture of zeolitic imidazolate framework-8 in the presence of iron(II) ions. The resulting material was characterized by X-ray diffraction, nitrogen adsorption isotherms, transmission electron microscopy, and by Raman and X-ray photoelectron spectroscopy. Fe/PC was the deposited on the surface of glassy carbon electrode (GCE) to obtain a sensor for amperometric determination of phenolic compounds. The unique catalytic activity, good electrical conductivity and hierarchical structure of the Fe/PC composite results in good electrooxidative activity towards hydroquinone (HQ; typically at 44 mV) and catechol (CC; typically at 160 mV). Under optimal conditions, the amperometric responses are linear in the range from 0.1 to 120 μmol · L −1 for HQ, and from 1.0 to 120 μmol · L −1 for CC. The respective detection limits are 14 and 33 nmol · L −1 . The sensor is highly selective against potential interferents and was successfully applied to the determination of HQ and CC contents in (spiked) water samples.
An amperometric sensor for phenolic compounds was constructed by using a metal-organic framework derived iron doped porous carbon material.
研究领域:
分析化学
·
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
ELECTROANALYSIS
·
2020
·Vol. 32
·期 9
·2010-2017
·
IF 2.544
Shengbiao Zheng,Jiaqi Hu,Xue Cui,Tao Hu,Yuyang Zhang,Jiahao Guo,Jing Tang,Xuchun Wang
In the present study, we report a facile method for preparing a porous MWCNTs/ZIF-67 nanocomposite with the help of a morphology-maintained ZIF-67 in situ growth on multi-walled carbon nanotubes. Interesting, the MWCNTs/ZIF-67 nanocomposite demonstrated excellent electrochemical activity for hydroquinone (HQ) and catechol (CC) attribute to the effective interconnections ZIF-67 crystals and MWCNTs. The analytical curves for HQ and CC obtained by differential pulse voltammetry (DPV) were linear in the range from 0.5 to 100 μM. Benefitting from the excellent conductivity of MWCNTs as well as the high surface area and porosity of ZIF-67, the advanced nanocomposite displayed good reproducibility, high selectivity and excellent stability, and was successfully employed to assay the content of dihydroxybenzene isomers in the lake water samples.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Yingnan Liu,Qinzhi Wang,Shuwen Guo,Pei Jia,Yuhang Shui,Siyu Yao,Chen Huang,Min Zhang,Li Wang
Hydroquinone (HQ) is a major phenol compound pollutant derived from industrial wastewater. Its content in environmental water is closely related to the water quality. Thus, it is in great need to develop facile, sensitive and selective detection methods for HQ. In this paper, an effective and selective HQ detection probe was fabricated based on novel silicon quantum dots (SiQDs), which were synthesized by a one-step hydrothermal method. Such SiQDs exhibited good water solubility and intensely green fluorescence. Interestingly, their fluorescence can be significantly quenched upon addition of HQ, which is attributed to the electron transfer from SiQDs to the generated 1,4-benzoquinone, and the inner filter effect of SiQDs-1,4-benzoquinone complex. This SiQD probe can detect HQ in a wide concentration range from 6 to 100 μM, with a detection limit of 2.63 μM. More importantly, compared with other reported methods, this probe can eliminate the interference from catechol (CC) and resorcinol (RS), and gives new insight on the discrimination HQ from its isomers. Furthermore, this fluorescent probe was also successfully applied for the determination of HQ in real water samples with satisfactory recoveries, indicating the reliability and potential application of this fluorescent probe for monitoring HQ.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Yongzhe Niu,Kai Kang,Beibei Wang,Lanyue Wang,Congwei Li,Xiang Gao,Zhenzhen Zhao,Xueping Ji
Single-atom nanozymes (SANs) can significantly enhance the sensitivity and selectivity of electrochemical sensing platforms due to the homogeneity of their active sites, full atom utilization, and high catalytic activity. In this study, we demonstrate the synthesis and characterization of a high-density Co-based single-atom nanozyme anchored on activated MOF-derived porous carbon (Co-AcNC-3) via a cascade anchoring strategy for ultrasensitive, simultaneous electrochemical detection of catechol (CC) and hydroquinone (HQ). The Co-AcNC-3 displays a large specific surface area , high defectivity, and abundant oxygen-containing groups, with Co atoms being atomically dispersed throughout the carbon support via Co–N bonds. The Co-AcNC-3 biosensor exhibits superior electrochemical signals for CC and HQ, with linear ranges of 4.0 μM–300.0 μM. and detection limits of 0.072 μM and 0.034 μM, respectively. Moreover, the Co-AcNC-3 biosensor has shown excellent performance in accurately detecting CC and HQ in actual samples. Our findings highlight the potential of the proposed Co-AcNC-3 biosensor as a reliable and promising sensing platform for determining CC and HQ.
研究领域:
分析化学
·
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 3
·1721-1726
·
IF 3.288
Yin Zheng,Jiabing Chen,Youluan Lu,Xinjian Song,Zhen Shi
Three-dimensional interconnected porous carbon nanosheets were prepared through pyrolyzing sodium D-isoascorbic acid, and were thoroughly characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The specific surface area and pore size distribution of the porous carbon nanosheets were characterized by N2 adsorption desorption. The thickness of the carbon nanosheet was measured by atomic force microscopy (AFM). An electrochemical sensor was fabricated by the modification of the porous carbon nanosheets onto a glassy carbon electrode surface. The electrochemical behaviors of hydroquinone (HQ) and catechol (CA) on the electrochemical sensor were investigated by cyclic voltammetry and differential pulse voltammetry. Under the optimized conditions, the peak currents were found to be linear to the HQ and CA concentrations in the range from 0.4 to 20 μmol L−1, and the detection limits were 0.028 μmol L−1 (HQ) and 0.035 μmol L−1 (CA), respectively.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 11
·2424
·
IF 5
Tingting Xu,Huanli Gao,Orlando J. Rojas,Hongqi Dai
In this work, a conductive hydrogel was successfully synthesized, taking advantage of the high number density of active amino and hydroxyl groups in carboxymethyl chitosan and sodium carboxymethyl cellulose. These biopolymers were effectively coupled via hydrogen bonding with the nitrogen atoms of the heterocyclic rings of conductive polypyrrole. The inclusion of another biobased polymer, sodium lignosulfonate (LS), was effective to achieve highly efficient adsorption and in-situ reduction of silver ions, leading to silver nanoparticles that were embedded in the hydrogel network and used to further improve the electro-catalytic efficiency of the system. Doping of the system in the pre-gelled state led to hydrogels that could be easily attached to the electrodes. The as-prepared silver nanoparticle-embedded conductive hydrogel electrode exhibited excellent electro-catalytic activity towards hydroquinone (HQ) present in a buffer solution. At the optimum conditions, the oxidation current density peak of HQ was linear over the 0.1–100 μM concentration range, with a detection limit as low as 0.12 μM (signal-to-noise of 3). The relative standard deviation of the anodic peak current intensity was 1.37% for eight different electrodes. After one week of storage in a 0.1 M Tris-HCl buffer solution at 4 °C, the anodic peak current intensity was 93.4% of the initial current intensity. In addition, this sensor showed no interference activity, while the addition of 30 μM CC, RS, or 1 mM of different inorganic ions does not have a significant impact on the test results, enabling HQ quantification in actual water samples.Keywords:hydroquinone;silver nanoparticle-embedded;conductive hydrogel;electrochemical sensor
研究领域:
材料科学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2015
·Vol. 22
·期 8
·1-11
·
IF 1.92
Liu Xin,Wang Tiancheng,Li Jingru,Cheng Jue,Zhang Junying
Two series of 4, 4′-diphenylmethane diisocyanate (MDI) type polyurethanes based on poly(tetramethyleneoxide) glycol (PTMO) and polybutylene adipate glycol (PBA) as soft segments were synthesized by one-step bulk polymerization process. Various hard segments were obtained from hydroquinone ether derivatives with or without ether oxygen structure bonded with the aromatic units in main chain, including hydroquinone (HQE), hydroquinone bis(b-hydroxyethy) ether (HQEE), and 4-hydroxyethyl ethyl oxygen-1-hydroxy ethyl benzene ether (HQEE-L) as chain extenders. The effect of chain extender structure on aggregation structure, thermal and mechanical properties was studied. ATR-FTIR suggested that hydrogen bonding interactions were significantly changed in the presence of flexible ether oxygen structure in hard segment. HQEE-based polyurethanes and HQEE-L-based polyurethanes displayed microphase separation and microphase mixing behavior respectively based on DMA and DSC results. XRD curves confirmed that flexible ether oxygen chain bonded with the rigid aromatic units played a balancing role in the steric effect caused by aromatic chain extender. Thermal properties of polyurethanes were affected mainly by the hard segment packing while mechanical properties were influenced by both phase separation and phase mixing which possess strong hydrogen bonding interactions. The excellent elongation in PTMO/HQEE-L and the high ultimate tensile strength in PBA/HQEE-L can be attributed to the phase mixing with strong hydrogen bonding interactions presented in HQEE-L-based polyurethanes.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 2
·B35
·
IF 3.12
Juanjuan Gao,Weiqing Zhu,Haiou Song,Shupeng Zhang
p-Phenylenediamine (PPD) and hydroquinone (HQ) are hair dye precursors for permanent dyeing and are used globally. We report a novel and economic approach for the selective and simultaneous detection of the cathodic peaks of PPD and HQ by using a bare glassy carbon electrode, compared with modified electrodes that are obtained by tedious or expensive functionalized and that failed to achieve a peak-to-peak separation of PPD and HQ. Linear relationships between the simultaneous cathodic peak current of PPD and HQ concentrations were obtained for 0.5–400 μM and 5–4,000 μM with detection limits (S/N = 3) of 0.163 and 0.353 μM, respectively. The glassy carbon electrode sensor was applied to determine PPD and HQ in Nanjing river water with a recovery for these two analogues of 98.7–103.9% and 98.0–102.4%, respectively.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Yi Hong Huang,Jian Hua Chen,Xue Sun,Zhen Bo Su,Hai Tao Xing,Shi Rong Hu,Wen Weng,Hong Xu Guo,Wen Bing Wu,Ya San He
Facile and stable nanocomposites, carbon nanocages (CNCs)-reduced graphene oxide (RGO), were developed via one-pot in situ solvothermal reaction in this study. Transmission electron microscope, scanning electron microscope, X-ray diffraction, Raman spectroscopy, energy dispersive X-ray spectroscopy, atomic focus microscope, N 2 adsorption/desorption isotherms, thermogravimetric analysis and Fourier-transform infrared were performed to characterize the CNCs-RGO hybrid material. The electrochemical detections of catechol (CC) and hydroquinone (HQ) were investigated by means of cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The excellent electrocatalytic activity and reversibility have been shown on the modified electrode toward oxidation of both CC and HQ in 0.04 M acetate buffer solution (pH = 4.0). The relationship between the oxidation peak current of CC and its concentration was linear over the range from 1 to 400 μM in the presence of 100 μM HQ, and the linear relationship between the oxidation peak current of HQ and its concentration can be obtained range from 1 to 300 μM in the presence of 100 μM CC. The detection limits (S/N = 3) for CC and HQ were 0.40 and 0.87 μM, respectively.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Zhengting Zhang,Guiyun Yi,Peng Li,Xikui Wang,Xiaodong Wang,Chuanxiang Zhang,Yulong Zhang,Qi Sun
Herein, a novel europium/graphene oxide/lead oxide (Eu/GO/PbO 2 ) composite based anode with excellent electrocatalytic performance towards degradation of hydroquinone was prepared by a facile co-electrodeposition method. The composition and micromorphology of the anode was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) and the results confirmed that europium (Eu) and graphene oxide (GO) were successfully composited with PbO 2 and a more compact structure was obtained, which was conductive to enhancing the corrosion resistance of the electrode. Besides, electrochemical measurements indicated that Eu/GO/PbO 2 electrode possessed longer service lifetime (87 h), higher oxygen evolution potential (2.64 V), and lower charge transfer resistance (41.08 Ω) than GO/PbO 2 and pure PbO 2 electrode. The promoted electrocatalytic activity of Eu/GO/PbO 2 electrode was ascribed to its stronger hydroxyl radical generation ability, more active sites and lower electron transfer resistance. Additionally, effects of initial hydroquinone concentration, applied current density and initial pH value on the degradation performance of Eu/GO/PbO 2 anode were systematically investigated. The behind degradation mechanism of hydroquinone by Eu/GO/PbO 2 anode was speculated on the basis of the major intermediates identified by high performance liquid chromatography-mass spectrometer (HPLC-MS). Under the continuous attack of free hydroxyl radicals, hydroquinone was finally decontaminated into CO 2 and H 2 O. The present work demonstrated that Eu/GO/PbO 2 composite anode exhibited excellent degradation performance towards hydroquinone.
研究领域:
环境科学
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2012
·
IF 3.898
Longzhen Zheng,Leyan Xiong,Yindi Li,Jingpeng Xu,Xiaowei Kang,Zhijun Zou,Shaoming Yang,Jian Xia
A polydopamine (PDA)-reduced graphene oxide (RGO) nanocomposite was prepared by a one-step procedure and was characterized by Fourier transform infrared spectra (FTIR), electrochemical impedance spectra (EIS), and atomic force microscopy (AFM). The characterizations confirm the successful reduction of graphene oxide to RGO in the PDA-RGO nanocomposite. The application of PDA-RGO nanocomposite in simultaneous determination of hydroquinone (HQ) and catechol (CC) was investigated. The Δ E p between HQ and CC was 103 mV, which was wide enough to discriminate the dihydroxybenzene isomers. The peak current of HQ was linear to its concentration in the range of 1.0 × 10 −6 to 2.3 × 10 −4 M and the peak current of CC was linear to its concentration in the range of 1.0 × 10 −6 to 2.5 × 10 −4 M.
研究领域:
材料科学
·
电化学分析
✓ 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）