NANO
·
2020
·
IF 1.566
Suping Wang,Yujiao Tu,Kunhao Qin,Xiaotian Yuan,Wei Chen,Yunlin Wei,Zhiwei Xu,Qi Zhang,Xiuling Ji
Phenolic compounds, especially 4-nitrophenol (4-NP), and chromium (VI) are highly toxic environmental pollutants. Thus, it is significantly important to establish a rapid and sensitive sensor for 4-NP and Cr(VI) monitoring in environment. In this paper, a novel approach has been adopted where E. coli -derived CDs (CDs- WT ) prepared by one step hydrothermal method previously and sensitized by ampicillin (turn-on) were used as fluorescence nanoprobe (CDs- WT -Amp) for 4-NP and Cr(VI) determination based on the inner filter effect quenching mechanism (turn-off). Then, the quenching fluorescence was reversed by addition of ampicillin (turn-on). The linear ranges of 4-NP and Cr(VI) detection were 0–50 μ M and 0–25 μ M, with the limits of detection 88.89 nM and 64.75 nM, respectively. The “turn-on-on-off-on” fluorescent nanosensor system was successfully used to determine Cr(VI) and 4-NP in water with satisfactory results. It shows that the “turn-on-off-on” nanoprobe has great promising potential for application to environmental pollutant detection.
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高影响因子
FOOD CHEMISTRY
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2020
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IF 6.306
Huihuang Xiong,Lan Guo,Xuejin Mao,Ting Tan,Hao Wan,Yiqun Wan
A magnetic hydrophilic molecularly imprinted material (MIM) with multiple stimuli-responses was prepared for efficient recognition of bisphenol A (BPA). MIM consisted of a magnetic core, an inner silica dioxide shell and an outer hydrophilic polymer shell, responsive for rapid magnetic separation, protection of the magnetic core and pH-/thermo-sensitivity to BPA, respectively. Controlled adsorption and release of BPA by pH/temperature regulation were realized through the reversible components of poly[N-isopropylacrylamide- co -2-(dimethylamino)ethyl methacrylate (NIPAM-DMAEMA)] (PND). The resultant MIM possessed superior affinity, selectivity and kinetics to BPA in aqueous solution. MIM was successfully applied to detect BPA in beverages via dispersive solid-phase extraction (d-SPE) coupled with high performance liquid chromatography (HPLC), exhibiting satisfactory recoveries of 80.70–108.18% with relative standard deviations (RSD) below 6.08%. The limit of detection of BPA was obtained as low as 3.75 nmol/L. The versatile MIM could be a promising alternative for extraction/removal of BPA in complicated samples by multiple-stimuli regulations.
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PubMed
高影响因子
Environmental Science-Nano
·
2020
·Vol. 7
·期 7
·1899-1911
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IF 7.683
Chunyang Nie,Zhenhua Dai,Wenjie Liu,Xiaoguang Duan,Chengyin Wang,Bo Lai,Zhimin Ao,Shaobin Wang,Taicheng An
Carbon-catalyzed persulfate activation is a metal-free advanced oxidation process for abating aqueous organic micropollutants. Recently, the electron-transfer mechanism in the activation of peroxydisulfate (PDS) has attracted tremendous interest due to its unknown nonradical reaction pathways. The conventionally used atomic-scale descriptors of adsorption energy (Eads), O–O bond length (lO–O) and S–O bond length (lS–O) cannot accurately reflect the ability of the functionalities of PDS in its activation. In this work, a new descriptor, local electrophilicity index (ω), which represents the oxidative capacity of adsorbed S2O82−, was included to identify the intrinsic active sites in carbocatalysts via density functional theory calculations. To verify the reliability of the proposed criteria, the catalytic performances of a series of highly boronated and nitrogenated carbon nanotube/nanosheet composites (BCN-NT/NS) with tailored physicochemical properties were comparatively studied for activating PDS to degrade phenol. By integrating the computational and experimental results, the catalytic activity of BCN-NT/NS was determined to not only be related to the contents of heteroatom dopants (B and N), but also the positions of B and N in the co-doping configurations. This study offers reliable criteria for determining the intrinsic catalytic sites in carbocatalysts for the activation of PDS based on an electron-transfer mechanism, which assists the rational design of nanocarbons as advanced catalysts for metal-free oxidation and water remediation.
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高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
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2020
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IF 4.006
Jingyang Yao,Jinxiang Chen,Jing Yang,Yuxin Hao,Yanling Fan,Chunyu Wang,Nana Li
The free, soluble-bound (esterified and glycosylated) and insoluble-bound phenolics from the dry raspberry pomace without seeds (RP) and raspberry seeds (RS) were obtained by acidic and alkali treatment. The total phenolic contents of different phenolic fractions from RP and RS by the Folin method followed the order: free > esterified ≈ insoluble-bound > glycosylated. Then 18 phenolics from RP and RS were quantified by HPLC-MS. Free phenolics had the highest total tested phenolic contents, while glycosylated phenolics were the lowest. Their antioxidant activity was increased by the increasing phenolic contents of different fractions. Free phenolics in raspberry pomace had the highest antioxidant activity by DPPH assay . RS-esterified phenolics had the hightest tyrosinase inhibitory activity (TIA) by enzyme activity analysis, which was equivalent to the TIA of 1.57 mM vitamin C. Among 9 typical phenolics, quercetin, chlorogenic acid, gallic acid and p -hydroxybenzoic acid on the TIA showed obvious promoting effects, while catechin, epicatechin, and caffeic acid exhibited a significant background effect. Therefore, p -hydroxybenzoic acid and gallic acid in RS-esterified phenolics were of great significance for the TIA. These results are beneficial to the comprehensive evaluation and utilization of the phenolic compounds in raspberry pomace.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Yunning Chen,Xiaoyan Zhang,Lingling Wang,Xueying Cheng,Qingkun Shang
An Fe-HQLC/TiO 2 (HQLC: 8-hydroxyquinoline-7-carboxylic) flower composite was synthesized and characterized. Phenol and four antibiotics: ciprofloxacin, tetracycline, amoxicillin and erythromycin can be efficiently and rapidly degraded by the Fe-HQLC/TiO 2 flower under visible light. The results indicated that more than 95% of the four antibiotics could be removed within 15 min. The photodegradation products of the four antibiotics were studied by high-performance liquid chromatography and high-resolution liquid chromatography-mass spectrometry. It was found that the adsorption characteristics of the antibiotics and their degradation products had a great influence on the photocatalytic activity of the photocatalyst and on the degradation rate of the antibiotics in recycling. Although the Fe-HQLC/TiO 2 flower did not degrade the four antibiotics completely, the parent structure of the antibiotics was destroyed to some extent. Therefore, the environmental toxicity and cytotoxicity of the antibiotics were significantly decreased. Compared with other related research works, there are a few photocatalysts capable of efficient and rapid removal of antibiotics.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Peizeng Yang,Li Qian,Yan Cheng,Yuefei Ji,Junhe Lu,Deyang Kong
Activated persulfate oxidation is an emerging technology with great prospects for soil remediation. For the first time, the present study demonstrated that application of this technology to soils with nitrite (NO 2 − ) presence yielded nitrophenolic byproducts, including 3-nitrophenol, 4-nitrophenol, 2-hydroxy-5-nitrobenzoic acid, and 4-hydroxy-3-nitrobenzoic acid. Their yields were positively related to the contents of soil organic matter (SOM). Most of these byproducts were distributed in soil waters, suggesting that they are readily transported to other places, thus can contaminate a larger area. Nitrated byproducts presumably formed by oxidation of NO 2 − by SO 4 − , which generates NO 2 . This generated NO 2 then reacted with phenolic moieties in SOM and was transformed to organic nitrogen. In addition, ammonia nitrogen in soils was oxidized by SO 4 − and contributed to the formation of nitrophenolic byproducts. Considering the omnipresence of nitrite and ammonia in subsurface soils, this study identified potential risks of persulfate use for in situ soil remediation. These results are relevant to devise strategies to avoid inappropriate use of oxidative reagents and the resulting formation of toxic byproducts.
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高影响因子
DYES AND PIGMENTS
·
2020
·
IF 4.613
Xiuling Ji,Xiaotian Yuan,Hongjuan Nian,Pengfei Song,Yingying Xiang,Yunlin Wei,Suping Wang,Kunhao Qin,Qi Zhang,Yujiao Tu
Novel blue fluorescent carbon dots (CDs- CP ) deriving from yeast Cryptococcus podzolicus 5–2 were successfully prepared via a facile and green hydrothermal synthesis method. It exhibited uniform particle size and possessed good excitation-dependent characteristic. The dead bacterial cells were selectively labled by the CDs- CP , but the live ones not, indicating good potential for the live/dead bacterial differentiation. It was found that the prepared CDs- CP showed low biotoxicity and excellent biocompatibility with multicolour fluorescence emission properties, which provided a new insight on the bioimaging application. In addition, the prepared CDs- CP exhibits high selectivity and sensitivity in Ag(I), 2,4-dinitrophenol (2,4-DNP) and 4-nitrophenol (4-NP) detection with excellent linear ranges of 0–15 μM (R 2 = 0.9945), 0–30 μM (R 2 = 0.9959) and 0–37.5 μM (R 2 = 0.9982), respectively. The low detection limits of Ag(I), 2,4-DNP and 4-NP were 113.57 nM, 73.36 nM and 86.47 nM, respectively. It revealed that static quenching mechanism dominated in Ag(I) quenching of the CDs- CP fluorescent, while those of 2,4-DNP and 4-NP were inner filter effect. The fluorescent CDs- CP was successfully applied to determine the Ag(I), 2,4-DNP and 4-NP in real water samples with satisfactory results. Therefore, it is a good candidate for bioimaging application and environmental pollutant detection.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Songxue Wang,Jiayu Tian,Zhihui Wang,Qiao Wang,Jialin Jia,Xiujuan Hao,Shanshan Gao,Fuyi Cui
A novel CuO modified ceramic hollow fiber membrane for in-situ peroxymonosulfate (PMS) activation was developed and employed in surface water treatment. The performance of membrane fouling control and organic pollutants removal was systematically investigated. The results indicated that compared with pristine membrane, CuO modified ceramic hollow fiber membrane significantly improved the removal of dissolved organic carbon (DOC) and UV absorbance at 254 nm (UV 254 ) in surface water. The removal rate increased with the increase of CuO loading content because of the reduction of the membrane surface pore size, but declined with the increase of PMS dosage due to the degradation products of incomplete mineralization passing through the membrane. The fluorescent compounds in surface water were efficiently removed by the CuO modified ceramic hollow fiber membrane and enhanced with the increase of PMS dosage and CuO loading content. The CuO modified ceramic hollow fiber membrane with in-situ PMS activation exhibits excellent antifouling property to natural organic matter (NOM) in surface water. Both the reversible and irreversible fouling decreased with the increase of PMS dosage while the membrane fouling would be slightly intensified with increased loading of CuO on the membrane, suggesting the trade-off relation between PMS dosage and CuO loading content. In addition, the degradation efficiency of organic pollutants in surface water was dramatically enhanced by the CuO modified ceramic hollow fiber membrane via incorporation of in-situ PMS oxidation process. High removal performance after five cycles of experiments showed the superior stability and reusability of the CuO modified ceramic hollow fiber membrane.
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高影响因子
PROGRESS IN ORGANIC COATINGS
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2020
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IF 4.469
Jingcheng Liu,Zhen Zhou,Xunzheng Su,Jiancheng Cao,Mengjia Chen,Ren Liu
A series of multi-crosslinkable, self-healing coatings were developed to enhance the mechanical properties through tandem UV-curing and Diels-Alder (DA) chemistry. First, multi-arm UV-cured polyurethane (PU) pre-polymers (IPxH 12 ) were prepared based on cyclotriphosphazene monomer (H 12 ) with more benzene ring structure and half-blocked photosensitive oligomer. Then N, N'-(4, 4′-methylenediphenyl) bismaleimide (BMI) and furfuryl alcohol (FA) were used as the raw materials to prepare DA intermediate by Diels-Alder reaction. The DA intermediate was further reacted with methacrylic acid isocyanate (IEM) to obtain the modified I DA monomer (UV curable DA monomer, containing acrylic double bond). The structure of IPxH 12 and I DA was characterized by FT-IR and 1 H-NMR. UV-cured self-healing coatings were prepared by designing some coating formulations with the IPxH 12 , I DA and initiator. The self-healing properties and mechanical properties of the coatings were investigated. The results revealed that the hardness of the coating was up to 3H, and the introduction of I DA improved its self-healing performance, when the ratio of DA monomer to PU was 2:1, the repair effect was the best. The UV-curable self-healing coating has potential application in metal protection and other fields.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Xiang Li,Yan Jia,Minghua Zhou,Xianfa Su,Jianhui Sun
In this study, the Fe, N co-doped biochar (Fe-N-BC) was prepared by pyrolyzing wheat straw, urea and iron salts and used to activate persulfate (peroxydisulfate, PS) for organic contaminant degradation. Iron oxide doping not only introduced magnetism into the biochar for easy separation, but also influenced its catalytic ability for PS activation. In the Fe-N-BC/PS system, almost all acid orange (AO7) was removed within 90 min with an apparent rate constant ( k obs ) of 0.114 min −1 , which was almost 37 times larger than that of pure N-BC (0.003 min −1 ). Factors influencing the removal of AO7 were investigated, including PS concentration, catalyst dosage, and initial pH. The Fe-N-BC/PS system had high removal efficiencies for various organic contaminants and showed high resistance to inorganic anions in aquatic environments. The radical quenching studies, electron paramagnetic resonance (EPR) measurements, and electrochemical analyses verified that the mechanism of AO7 degradation in the Fe-N-BC/PS system included both radical and non-radical pathways involving the generation of OH, SO 4 − , O 2 − , 1 O 2 , and electron transfer. Additionally, persistent free radicals (PFRs) on the catalysts also related to their catalytic efficiencies. These results demonstrated that the Fe-N-BC/PS system had the potential for wastewater treatment applications.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Yun Shan,Hong-Lin Zhang,Yuan Zhu,Ying Wang,Huaju Song,Chuanguo Shi
An electrochemiluminescent immunosensor is constructed for the detection of diethylstilbestro (DES) on the basis of amplified quenching of electrochemiluminescence (ECL) from CdTe nanocrystal (NC)/reduced graphene oxide (rGO) composite films by antibody (Ab) against DES-modified SiO2 nanoparticles (Ab@SiO2). In this immunosensing system, CdTe NC/rGO composite films act as solid supporters for both DES and ECL emitters, which generate a 100-fold stronger ECL emission than CdTe NC films because the presence of rGO can lower the potential barrier, facilitate charge transfer, suppress nonradiative Auger recombination, and make the electron trap states fill more efficiently. On the composite films, the immobilized ovalbumin-modified DES (OVA-DES) competes with free target DES to bind Ab@SiO2. As a result, the number of formed OVA-DES-Ab@SiO2 immunocomplexes is inversely related to that of target DES. Using an ECL quenching maximum at blank as a calculation benchmark, the ECL intensity increment of the immunosensor and the concentration of target DES show a linear range of 0.002–2 ng/mL (R2 = 0.996) with a detection limit of 0.001 ng/mL (signal/noise = 3). This immunosensor, of good selectivity and stability, was used to detect beef samples, with recoveries at a scope of 93.2%–105.0%.
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ANALYTICAL LETTERS
·
2020
·
IF 1.467
Pan Guo,Song Zheng,Yong Wang,Qianfen Zhuang,Yongnian Ni
Fluorescent tremella-like carbon nanosheets (TCNs) were hydrothermally synthesized using citric acid and adenosine as the starting materials. The resulting product had high quantum yield, water-solubility, and photostability. The addition of 2,4,6-trinitrophenol (TNP) induces remarkable fluorescence quenching, and this phenomenon was used to construct a TNP fluorescence sensor. The fluorescence quenching of TCNs by TNP was shown to be likely due to the inner filter effect. The developed sensor has a wide linear range from 0.05 to 50.0 μM with a detection limit of 5 nM. The TCN-based sensor was used for the determination of TNP in lake water with satisfactory recoveries from 98% to 103%.
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高影响因子
危险品化学品经营许可证（带存储）