TALANTA
·
2017
·
IF 4.162
Xiaofang Ma,Yali Wu,Samrat Devaramani,Caizhong Zhang,Qixia Niu,Mahgoub Ibrahim Shinger,Wenqi Li,Duoliang Shan,Xiaoquan Lu
The GO-COOH/AuNPs/ZnAPTPP nanocomposites were constructed using zinc monoamino porphyrin (ZnAPTPP) through π–π conjugation with carboxylated graphene oxide (GO-COOH) loaded with Au nanoparticles (AuNPs). Prepared materials were characterized by 1 H NMR spectra, UV–vis absorption spectroscopy and electrochemical impedance spectroscopy . ITO electrode surface was modified with the prepared nanocomposites showed a good photocurrent response when the bias potential, −0.1 V was applied. Nanocomposites modified ITO electrode exhibited good photo-response to the 4-nitrophenol (4-NP). ZnAPTPP were excited from HOMO to LUMO under light irradiation , the photoexcited electrons injected into the conduction band of GO-COOH, and then transferred to AuNPs further to the ITO. The presence of GO-COOH and AuNPs improved the separation of photogenerated charges due to their synergetic effect and excellent conductivity. Externally added 4-NP scavenges the photogenerated holes i.e. it acts as a sacrificial electron donor thereby it enhances the photocurrent of the system. Based on this interaction, a novel method for photoelectrochemical detection of 4-NP was developed with a linear range from 0.1 to 15 nmol/L (r = 0.996) and detection limit of 0.04 nmol/L (S/N = 3). Proposed method is simple and sensitive and this was successfully applied for the quantification 4-NP in river water sample matrices.
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高影响因子
ANALYST
·
2017
·Vol. 142
·期 18
·3459-3467
·
IF 3.885
Weichun Ye,Hong Huang,Weiwei Yang,Xiang Wang,Cuiling Ren,Qiushi Hu,Yumin Li,Bin Ren
In shell-isolated nanoparticle (NP)-enhanced Raman spectroscopy (SHINERS), traditional metal oxide-based shells have inferior chemical inertness, they require strict preparation conditions, and lack specific groups, which lead to their poor selectivity toward target molecules. In this study, ultrathin and compact gold (Au)@polydopamine (PDA) SHINERS NPs were successfully fabricated by a simple self-polymerization technique. High wrapping tendency of PDA, a multifunctional biopolymer, favored the fabrication process. Au@PDA NPs exhibited a typical shell-isolated effect, i.e., Au@PDA NPs with a thick shell (more than 2.3 nm) showed a lower SERS activity, while those with an ultrathin (1.3 nm) shell exhibited higher SERS activity compared to uncoated Au NPs. The Au@PDA SHINERS substrate shows high performance in terms of sensitivity, uniformity, and stability. The relative standard deviations (RSDs) of SERS intensities from ten positions on the same substrate were less than 4%. Their Raman intensities dropped by only 15% over two months. More importantly, the Au@PDA (1.3 nm) SHINERS substrate exhibited high SERS activity for label-free and quantitative detection of benzotriazole (BTA), an important corrosion inhibitor, through utilizing a presumed π–π stacking interaction. A broad linear range from 10−4 to 10−8 M was achieved with a low detection limit (LOD) of 1 nM (0.119 μg L−1). The LOD was not only significantly lower than the maximum allowable level (20 μg L−1) of the Australian government water guide, but also lower than that of some modern methods such as fluorescence, liquid chromatography, and gas chromatography coupled with mass spectrometry. Furthermore, the substrate showed excellent discrimination against other compounds with a single aromatic ring. It is expected that the Au@PDA SHINERS substrate will offer great potential for analysis application in a complicated environmental system.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Peng Xu,Xuguang Liang,Nannan Chen,Jingen Tang,Wei Shao,Qinwei Gao,Zhaogang Teng
In the work, we have synthesized silver (Ag) nanoparticles deposited chitosan (CS) microcapsules with magnetic multiple Fe 3 O 4 cores (denoted as Fe 3 O 4 /CS-Ag) as efficient catalysts for the reduction of 4-nitrophenol. The Fe 3 O 4 /CS-Ag catalysts are prepared by coating hydrophobic Fe 3 O 4 nanoparticles with chitosan via a multiple emulsion-chemical crosslinking method and following in situ deposition of Ag nanoparticles onto the surfaces. The morphology and composition of the Fe 3 O 4 /CS-Ag microcapsules are characterized by Fourier transform infrared (FT-IR) spectra, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy. Moreover, the catalytic activity of the Fe 3 O 4 /CS-Ag catalyst was investigated, which shows a conversion efficiency as high as 98% within 15 min for the reduction of p-nitrophenol to p-aminophenol. At the same time, the recovered Fe 3 O 4 /CS-Ag catalyst with an external magnet can retain good activity after 10 cycles. These results indicate that the multiple emulsion-chemical crosslinking method is an efficient and simple way for the preparation of magnetic separable chitosan microcapsules, and the fabricated Fe 3 O 4 /CS-Ag is a promising catalytic material with excellent catalytic activity and convenient recovery ability.
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高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2017
·
IF 1.751
Giovanni Cagnetta,Jun Huang,Igor O. Lomovskiy,Gang Yu
Zero-valent iron (ZVI) is a valuable material for environmental remediation, because of its safeness, large availability, and inexpensiveness. Moreover, its reactivity can be improved by addition of (nano-) particles of other elements such as noble metals. However, common preparation methods for this kind of iron-based composites involve wet precipitation of noble metal salt precursors, so they are often expensive and not green. Mechanochemical procedures can provide a solvent-free alternative, even at a large scale. The present study demonstrates that it is possible to tailor functional properties of ZVI-based materials, utilizing high-energy ball milling. All main preparation parameters are investigated and discussed. Specifically, a copper-carbon-iron ternary composite was prepared for fast degradation of 4-nitrophenol (utilized as model pollutant) to 4-aminophenol and other phenolic compounds. Copper and carbon are purposely chosen to insert specific properties to the composite: Copper acts as efficient nano-cathode that enhances electron transfer from iron to 4-nitrophenol, while carbon protects the iron surface from fast oxidation in open air. In this way, the reactive material can rapidly reduce high concentration of nitrophenols in water, it does not require acid washing to be activated, and can be stored in open air for one week without any significant activity loss.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Yinhui Yi,Odoom Jibrael Kingsford,Mwenze Nkulu Fiston,Junjuan Qian,Zhenjiang Liu,Lirong Liu,Gangbing Zhu
Due to the harmful nature of 4,4′-diaminobiphenyl (DABP) to the environment and human health, the determination of DABP is of great significance and has received great attention. However, there is no electrochemical method reported to detect DABP. In this paper, perylenetetracarboxylic acid (PTCA) noncovalently functionalizes carbon nanohorns (PTCA-CNHs) nanohybrids were produced using a simple method and applied for the first electrochemical sensing of DABP. Herein, PTCA has two key advantages for functionalizing CNHs in DABP analysis: (I) PTCA could improve the dispersibility of CNHs in water and (II) enhance the accumulation capacity of DABP on PTCA-CNHs surface by means of the electrostatic interactions between PTCA (negative) and DABP (positive). The results show that the oxidation current of DABP at the PTCA-CNHs modified screen printed carbon electrode (SPCE) is much higher than that of the CNHs/SPCE and bare SPCE. The PTCA-CNHs/SPCE has a linear response range of 5.0 to 400.0 nM with a detection limit of 1.8 nM towards DABP detection.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 25
·20567-20576
·
IF 2.741
Yao Lingdan,Wang Lixiao,Cheng Guanghuan,Huang Qian,Hu Baolan,Lu Jingrang,Lou Liping
In a previous study, we found that rice-straw biochar degraded and removed hydrophobic organic contaminants (HOCs) through coupled adsorption-biodegradation. However, few studies have determined whether biochar affects HOC isomer degradation and isomer-selective biodegradation or whether biochar can alter HOC isomer features, resulting in changes to HOC isomer residues in water environments. In this study, the effects of biochar at two dosages (0.001 and 0.01 g) on the biodegradation of ten isomers of a typical xenoestrogen of nonylphenol (NP) were evaluated. The results revealed that there were no effects of biochar on the adsorption of NP isomers. However, biochar addition affected the biodegradation of a specific isomer without altering the features of the NP isomers. The treatment of NP isomers with Pseudoxanthomonas sp . yielded degradation ratios ranging from 60.7 to 100%. At 0.001 g biochar treatment, the degradation of eight NP isomers was enhanced (except for NP 194 and NP 193a+b ) due to their bulky structures. The degradation of the ten NP isomers was inhibited when 0.01 g biochar was added. These findings characterized the effects of biochar on NP isomer contaminants and provided basic information for the application of biochar for the remediation of NP isomer contaminants.
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高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 10
·2226-2232
·
IF 1.915
Linye Jiang,Haijian Liu,Ming Li,Yue Xing,Xueqin Ren
We tested a simple and economical approach to synthesize CdTe quantum dots (QDs). We then developed a MIP-capped CdTe QD fluorescent sensor by anchoring a molecularly imprinted polymer (MIP) layer on the surface of CdTe QDs using 3-aminopropyltriethoxysilane as the functional monomer and tetramethoxysilane as the cross-linker via a surface molecular imprinting process. The sensor possessed the sensitivity of CdTe QDs, the selectivity of the molecular imprinting technique, and a nearly spherical morphology. The fluorescence of the MIP-capped CdTe QDs can be efficiently quenched when the template 4-nitrophenol (4-NP) rebinds to the binding sites, as a result of the charge transfer from QDs (donor) to 4-NP (acceptor). MIP-capped CdTe QDs generated a significantly reduced fluorescence intensity within the initial 12 min of binding 4-NP. Under optimized conditions, the sensor presented a satisfactory linearity with 4-NP concentrations in the range of 1–30 μM, and the detection limit was 40 nM. The sensor also successfully detected trace amounts of 4-NP in water samples, and the recovery of 4-NP in three spiked samples ranged from 95.1% to 98.1% with relative standard deviations below 4.3%. The results provide an alternative method for the development of sensors for the rapid recognition and determination of 4-NP in water samples.
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CRYSTENGCOMM
·
2017
·Vol. 19
·期 37
·5686-5691
·
IF 3.474
Zhao Huang,Kai Cai,Huan Zhang,Zilan Hong,Zhaodong Yuan,Heyou Han
A facile method for the synthesis of Au-pearl/Pd-wire heterostructured nanonecklaces (APHNs) was developed for the first time, in which regular Au pearls with controllable size and interval distance were interlinked into a string by an ultrathin and ultralong Pd nanowire. The distribution density of Au nanopearls was regulated by the concentration of the reducing agent, while their size was controlled by the amount of the Au precursor. In the study of degradation of 4-nitrophenol (4-NP), the catalytic properties of several typical APHNs are proved to be inherently related to their morphology. By comparison with other nanostructures and commercial Pd/C, the APHNs show superior catalytic activities and better stability in general. The study demonstrated that novel heterostructures have superior catalytic properties in the degradation of 4-NP. Moreover, the nanostructures have the potential to be used as a high-efficiency catalyst in other catalytic reactions.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 4
·1161-1167
·
IF 4.58
Zhu Jianli,Chen Dongping,Ai Youhong,Dang Xueping,Huang Jianlin,Chen Huaixia
The authors have synthesized a dummy molecularly imprinted monolith (MIM) in the tip of a micropipette using a sol-gel method. The MIM was applied to selective solid-phase microextraction (SPME) of vanillin (VN) and methyl vanillin (MV) prior to their determination by HPLC. The MIM was characterized by thermogravimetric analysis, scanning electron microscopy and FTIR. Some parameters affecting SPME were optimized. Then, a sensitive SPME/HPLC method was developed for the determination of VN and MV in infant milk powder. Under optimized conditions, the response is linear in the 2 to 3000 μg∙kg −1 VN concentration range and in the 3 to 2000 μg∙kg −1 range for MV. The detection limits (for an S/N ratio of 3) are 0.5 and 1 μg∙kg −1 , and the recoveries are between 83 and 110% for VN and between 80 and 101% for MV.
A dummy molecularly imprinting monolith was synthesized and applied for SPME of vanillin and methyl vanillin before HPLC. The detection limits of the method for vanillin and methyl vanillin in milk powder were 0.5 and 1 μg·kg −1 , respectively.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2017
·
IF 4.9
Panpan Diao,Qi Chen,Rui Wang,Dong Sun,Zhuoping Cai,Hao Wu,Shunshan Duan
Abtsract Three phenolic endocrine-disrupting compounds, 4-nonylphenol, 4-tert-octylphenol and bisphenol A, were determined in water, sediment and biota (fish, shrimp and mollusk) collected from sites along the Pearl River Estuary, China. The 4-nonylphenol, 4-tert-octylphenol and bisphenol A concentrations ranged from 1.20–3352.86 ng/L in the water, < 0.17–20.80 ng/g dw in the sediment and < 1.49–237.12 ng/g dw in the biota. The concentrations of 4-nonylphenol were higher than those of 4-tert-octylphenol and bisphenol A in the water, sediment and organisms. Moreover, the bioconcentration factors (BCFs) and biota-sediment accumulation factors (BSAFs) of 4-nonylphenol and bisphenol A were calculated, and were found to be higher for 4-nonylphenol and in demersal organisms. To assess co-exposure to phenolic endocrine-disrupting compounds, the 4-nonylphenol equivalent was employed to evaluate the potential risks to aquatic organisms and human health, and the results indicated a low risk.
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JOURNAL OF SURFACTANTS AND DETERGENTS
·
2016
·Vol. 19
·期 3
·567-572
·
IF 1.853
Ruixia Niu,Chao Wang,Hua Song,Lingzhi Liao,Jingling Wang,Weidong Ren
A series of nonylphenol-substituted alkyl sulfonates (C x NPAS, x = 8, 10, 12, 14, 16) with two hydrocarbon chains and two different hydrophilic groups has been synthesized from α-olefins and nonylphenol. The respective products have a “pseudo-gemini” surfactant structure. The structures of the C x NPAS have been characterized by IR, UV, 1 H nuclear magnetic resonance, electrospray ionization mass spectrometry, and elemental analysis. The effects of carbon chain length of the obtained surfactants on properties such as the critical micelle concentrations (CMC) in aqueous solutions, surface tension at the CMC ( γ CMC ), and efficiency of adsorption at the water/air interface ( pC 20 ) have been determined. The γ CMC of the surfactants first decreased and then increased with increasing length of the carbon chain x , and reached a minimum of 29.25 mN/m at x = 10, which is much lower than that of α-olefin sulfonate (AOS) (33.52 mN/m). The CMC decreased and pC 20 increased with increasing x . The introduction of the hydroxyl group is responsible for multiple molecular conformations at the water/air interface and leads to a greater molecular area A min and smaller Γ max than those of AOS.
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MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 5
·1699-1704
·
IF 4.831
Chen Donghua,Peng Rulin,Zhou Hong,Liu Hui
Graphene oxide quantum dots (GOQD) are capable of enhancing the green chemiluminescence (CL) of the system composed of bis (2,4,6-trichlorophenyl) oxalate, hydrogen peroxide and fluorescein (TCPO/H 2 O 2 /fluorescein). It was found that 4-nitrophenol (4-NP) causes a further enhancement of the system, and this was exploited to develop a CL detection scheme for 4-NP. The optimum reaction concentrations were established, and under these conditions the calibration plot is linear in the 1.0 to 300 pmol L −1 concentration range, with a 0.3 pmol L −1 detection limit (at 3σ).We assume that CL enhancement is due to energy transfer from GOQD to fluorescein which is promoted by the interaction of 4-NP with the GOQD. The method was applied to the determination of 4-NP in spiked tap water and river water and gave recoveries between 93.4 and 107.9 %, with relative standard deviations of <4.0 %.
Graphene oxide quantum dots (GOQD) are good enhancer of Bis(2,4,6-trichlorophenyl) oxalate (TCPO) and hydrogen peroxide chemiluminescence (CL) system. The CL emission of fluorescein can be further enhanced by GOQD and this provides an extremely sensitive detection platform for 4-nitrophenol (4-NP).
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