Frontiers in Marine Science
·
2024
·
IF 2.8
Gao Nan,Kong Xiangfeng,Zhang Yanmin,Gao Yang,Zhang Yuanbiao,Liu Yan
In recent years, microplastics, especially marine microplastic pollution, have received global attention as a new type of environmental problem. The establishment of accurate and efficient methods for the detection of microplastics is the basis for in-depth research on the transport, transformation, fate, and ecotoxicological effects of microplastics in the environment. Microplastics in seawater frequently mix with biological tissues, resulting in challenges when identifying samples. However, commonly used pretreatment protocols for microplastics often suffer from long digestion times, inadequate digestion, and the risk of potentially damaging microplastics. This study compared the digestion efficiencies of five digestion reagents and provided further insights into two advanced oxidation methods involving Fenton’s reagent and an innovative alkaline K2S2O8 protocol based on sulfate and hydroxyl radicals. Using Raman spectroscopy, scanning electron microscopy-energy dispersive spectroscopy (SEM−EDS), and carbonyl index (CI) analyses, the status of microplastics after pretreatment was evaluated. The results revealed that the alkaline K2S2O8 method could enhance the reaction efficiency while reducing the potential for functional group damage during microplastic pretreatment. Moreover, the proposed K2S2O8 method was applied to the pretreatment of field seawater samples, and field microplastics were effectively separated from biologically rich samples. Thus, a digestion protocol based on alkaline K2S2O8 provides an effective way to isolate seawater microplastics from biologically rich samples. This study contributes to the development of efficiently microplastic monitoring and provides valuable insights into access to reliable data for fate and inventory of oceanic microplastics.
研究领域:
环境科学
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海洋学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Qiufeng Lan,Qingyi Li,Xueyan Zhang,Zhidong Chen
A novel electrochemiluminescence (ECL) system that consists of the copper sulphide (CuS) film and K 2 S 2 O 8 was prepared and used for detecting crystal violet in aqueous solutions. The CuS film was a luminescent semiconductor material, which was modified on glassy carbon electrode (GCE) via one-step electrodeposition . To enhance the ECL intensity, K 2 S 2 O 8 was added into the solution. The morphology and composition of the modified electrodes were analyzed with scanning electron microscope, energy-dispersed spectrum, transmission electron microscope, high resolution transmission electron microscopy , X-ray diffraction and Raman spectroscopy. Electrochemical impedance spectroscopy (EIS) was studied for different electrodeposition time. Under the optimal conditions, the ECL intensity of the quenching value (ΔECL) versus the logarithm of the concentration of crystal violet was linear over a concentration range from 5.0 × 10 − 8 to 1.0 × 10 − 5 mol L − 1 ( r = 0.9926) and the limit of detection (LOD) was up to 3.2 × 10 − 9 mol L − 1 .
研究领域:
分析化学
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环境科学
✓ 已验证
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2019
·
IF 4.197
Xiangxiang Qin,Xia Xu,Jing Lu,Yinggui Zhu
This paper reports for the first time the strong cathodic electrochemiluminescence (ECL) behavior of quinoline, isoquinoline and their derivatives in aqueous solution with K 2 S 2 O 8 as coreactant. The effects of K 2 S 2 O 8 concentration, pH and scan rate on the ECL intensity have been studied in detail. Calculations of the HOMO-LUMO energy gap for the ECL reaction indicated that isoquinoline is more likely to produce an excited state radical ion than quinoline. The effects of different functional groups on the ECL of isoquinoline were then compared and a possible ECL reaction mechanism was discussed. This work provides a simple and sensitive ECL method for the detection of quinoline and isoquinoline, which are important drug intermediates.
研究领域:
分析化学
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药物化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Le Zhang,Yong Liu,Jianlong Wang
The oxidation of ammonium (NH 4 + ) to dinitrogen (N 2 ) with high selectivity and high efficiency is still a challenge. Herein, a novel sunlight induced persulfate (PS)-based AOPs process (MgO/Na 2 SO 3 /PS/ hv ) was proposed by introducing solid base (MgO) and hydrated electron (e aq − ), to selectively oxidize NH 4 + to N 2 , with high selectivity and high efficiency at a wide range of pH value. The deprotonation of NH 4 + into NH 3 by MgO and the generation of •OH and SO 4 −• by PS activation were responsible for the high efficiency of NH 4 + oxidation. The buffering capacity provided by MgO to proton released from PS activation made the NH 4 + oxidation possible at a wide pH range. The e aq − from the Na 2 SO 3 / hv process was the main active specie to reduce NO 2 − and NO 3 − (NO x − ) into N 2 , responsible for high N 2 selectivity of NH 4 + oxidation. 100% NH 4 + could be oxidized within 30 min, and N 2 selectivity exceeded 96% at the initial pH range of 3–11 and the initial concentration of NH 4 + of 30 mg N/L. This work could offer an efficient AOPs process for selective NH 4 + oxidation, which is promising for the chemical denitrification of wastewater ….
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Ying Zhou,Wen Jiang,Jingbo Xu,Mao Li,Jie Gao,Dingfeng Yang,Yuanyuan Li
Sol-gel-derived oxygen-vacancy InBO 3 activates peroxydisulfate to catalyze styrene oxidative trifluoromethylation into trifluoromethyl phenyl ketone. • Oxygen-deficient InBO 3 -5 achieves an optimal product yield of 41.57%. • Oxygen-vacancy-derived reactive oxygen species cooperate with activated PDS to produce CF 3 radicals. • This system offers a green new route to trifluoromethylated carbonyl compounds. The difunctionalization of alkenes is an efficient strategy for the synthesis of complex molecules, among which oxidative trifluoromethylation represents a direct route to α-trifluoromethylated ketones, an important class of fluorine-containing building blocks. Herein, the combination of an oxygen-vacancy-rich heterogeneous catalyst InBO 3 with K 2 S 2 O 8 was designed to realize the oxidative trifluoromethylation of styrene under mild conditions. In this system, oxygen vacancies mediate the activation of O 2 to generate superoxide anion radical ( O · − 2 ) and singlet oxygen ( 1 O 2 ), which in turn synergize with K 2 S 2 O 8 to activate CF 3 SO 2 Na, producing ∙CF 3 radicals. A radical addition-oxidation pathway then affords the desired product, α-trifluoromethylacetophenone. Using a citric acid modulation strategy, a series of InBO 3 -X catalysts with tunable oxygen vacancy concentrations were successfully prepared. Among them, InBO 3 -5 achieved a product yield of 41.57%. This catalytic system features advantages such as catalyst recyclability, noble-metal-free composition, and mild reaction conditions, providing a new strategy for the green synthesis of trifluoromethylated carbonyl compounds. Oxygen-vacancy InBO 3 -mediated K 2 S 2 O 8 activation toward styrene trifluoromethylation. Download: Download high-res image (127KB) Download: Download full-size image
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DOI
高影响因子
Journal of Analysis and Testing
·
2021
·Vol. 6
·期 3
·296-307
·
IF 0
Liu Feng-Yu,Zhang Tong-Kai,Zhao Yi-Long,Ning Hong-Xia,Li Fu-Sheng
It is essential to screen novel luminophores and co-reactants for the development of electrochemiluminescence (ECL) systems. In this work, a series of 1,8-naphthalimide-modified graphitic carbon nitride (CN/1,8-NDI x ) ECL luminophores were successfully developed for the quantitative determination of Cu 2+ with K 2 S 2 O 8 as a co-reactant. When CN/1,8-NDI x was immobilized on the surface of the glassy carbon electrode (GCE), a strong ECL signal could be produced (at a potential of − 1.3 V vs. Ag/AgCl), which was threefold stronger than that of unmodified g-C 3 N 4 . The intensity of ECL could be linearly quenched by Cu 2+ over a concentration range from 5 × 10 −9 to 1 × 10 −4 mol/L, and with a low limit of detection (LOD) of 0.86 nmol/L. Our results may provide a new perspective on the novel ECL platforms development.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
RSC Advances
·
2015
·Vol. 5
·期 28
·22289-22293
·
IF 3.84
Qiyi Lu,Juanjuan Zhang,Yuanya Wu,Ruo Yuan,Shihong Chen
The cathodic electrochemiluminescence (ECL) behavior of the ammonolysis product of 3,4,9,10-perylenetetracarboxylic dianhydride (PTC–NH2) in aqueous solution with K2S2O8 as the co-reactant has been, for the first time reported, in this paper. The possible mechanisms have been investigated. Based on the fact that dopamine (DA) can efficiently quench the ECL intensity of PTC–NH2, DA was chosen as a template to investigate the application of PTC–NH2–S2O82− system in the sensor field. Under the optimal conditions, we achieved the detection of DA with the detection limit of 1.6 × 10−9 M. Due to the excellent ECL behavior, PTC–NH2 could be a new class of promising material for the construction of ECL sensors.
研究领域:
分析化学
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生物传感
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Qing Hua,Feiyan Tang,Xiaobin Wang,Min Li,Xiaowen Gu,Wenjie Sun,Feng Luan,Chunyuan Tian,Xuming Zhuang
In this work, the electrochemiluminescence (ECL) of europium sulfide nanocrystals (EuS NCs) in K 2 S 2 O 8 cathode co-reagents was studied. Based on selective quenching of the ECL emission from EuS NCs by Hg 2+ , a novel label-free ECL sensor for the highly sensitive and selective detection of Hg 2+ was developed. A linear response between the ECL intensity and the concentration of Hg 2+ was obtained in the range from 0.1 pM to 10 5 pM, achieving a detection limit of 0.028 pM. Moreover, this sensor was also successfully applied to the detection of Hg 2+ in seafood with good recovery. The current study provides a green and feasible method for the detection of trace Hg 2+ in seafood.
研究领域:
分析化学
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环境科学
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食品科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2016
·
IF 4.764
Jia-Ning Xie,Zhen-Feng Diao,Chang Qiao,Ran Ma,Liang-Nian He
Efficient synthesis of cyclic carbonates from olefins using K 2 S 2 O 8 as oxidant and NaBr as “bromination” reagent has been developed through a reaction sequence involving hydroxybromination of olefins and subsequent carboxylation of the bromohydrin in situ generated with CO 2 . This process provides a novel and convenient access to cyclic carbonates in a one-pot stepwise fashion. Representative olefins with different functional groups could react smoothly under relatively mild (3 MPa, 60 °C) and transition metal-free conditions to afford various cyclic carbonates.
研究领域:
有机化学
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绿色化学
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二氧化碳利用
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合成方法学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
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IF 4.798
Yinggui Zhu,Min Zhao,Xiaojuan Hu,Xiaofang Wang,Ling Wang
In this paper, we report a novel rare earth metal complex with the weak ligand of aromatic sulphonic acid (pyridine-3-sulfonic acid, 3-pSO 3 H), and characterized by FT-IR, UV–vis, energy-dispersive X-ray spectroscopy (EDX), electrochemiluminescence spectra, etc. Then an excellent electrochemiluminescence (ECL) signal was observed with K 2 S 2 O 8 as the coreactant in NaAc-HAc buffer solution. For another thing, the electrochemical properties of the compound have been thoroughly investigated in acetonitrile solution, the possible ECL reaction mechanism was proposed as well. Furthermore, a simple and straightforward ECL platform was reported for sensitive and selective detection of Cd 2+ due to the effective quenching after addition of Cd 2+ . Other heavy/transition metal ions do not interfere with the sensing. The limit of detection is determined as 0.13 nM, the results suggested that as-prepared complex could be a promising material for developing ECL senors to detect the Cd 2+ rapidly indwell in environmental and practical samples.
研究领域:
分析化学
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环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Xiaorui Zhang,Yu Mei,Hao Cheng,Jianfeng Ma,Fang Zhu,Sridhar Komarneni
NiO and CeO 2 composite metal oxides (NiO–CeO 2 ) were synthesized by sol-gel method to investigate a degradation system by persulfate (PS) activation with the assistance of visible light (Vis). The phase composition of NiO–CeO 2 was detected by X-ray diffraction (XRD), the morphology of NiO–CeO 2 was characterized by scanning electron microscope (SEM), and the result of X-ray photoelectron spectroscopy (XPS) proved the element composition and valence state of the NiO–CeO 2 . In the Vis/PS/NiO–CeO 2 system, the degradation rate of Orange II using a concentration of 50 mg/L was as high as 90% in 15 min but it increased to as high as 99% in 60 min. Mechanism studies have shown that the combination of NiO and CeO 2 generated more oxygen vacancies , and activated persulfate to generate active oxygen species. Moreover, the effects of visible light , persulfate concentration and pH were evaluated, and the results showed that the participation of visible light and persulfate could significantly increase the degradation efficiency of Orange II, but pH had little effect on the degradation. Quenching experiments and detection by ESR showed that O 2 ‾, •SO 4 ‾, •OH, and 1 O 2 all contribute to the removal of Orange II. In addition, the recovery and reuse properties of NiO–CeO 2 may lead to sustainable treatment of wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SYNTHESIS-STUTTGART
·
2019
·Vol. 51
·期 16
·3085-3090
·
IF 2.867
Menglan Wang,Yudong Li,Qing-An Wu,Shuping Luo,Yuehui Li
Indole scaffold synthesis relies primarily on oxidative C–H amination of N-protected alkenylanilines for C–N intramolecular cyclization reactions. Herein, for the first time, without N-protection, various readily prepared 2-alkenylanilines were transformed into the desired indole products in good yields by using K2S2O8 as oxidant in the presence of catalytic amounts of FeF2. The K2S2O8/FeF2 system offers a direct and benign synthetic route to 3-arylindoles and it is applicable to a wide range of substituted indoles including drug intermediates.
研究领域:
有机化学
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合成化学
·
药物化学
✓ 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）