CHEMOSPHERE
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2024
·
IF 8.1
Hong-Peng Shi,Ying-Hao Zhao,Mei-Lin Zheng,Cheng-Yan Gong,Lei Yan,Ying Liu,Yong-Ming Luo,Zhi-Pei Liu
The performance of bacterial strains in executing degradative functions under the coexistence of heavy metals/heavy metal-like elements and organic contaminants is understudied. In this study, we isolated a fluorene-degrading bacterium, highly arsenic-resistant, designated as strain 2021, from contaminated soil at the abandoned site of an old coking plant. It was identified as a member of the genus Rhodococcus sp. strain 2021 exhibited efficient fluorene-degrading ability under optimal conditions of 400 mg/L fluorene, 30 °C, pH 7.0, and 250 mg/L trivalent arsenic. It was noted that the addition of arsenic could promote the growth of strain 2021 and improve the degradation of fluorene – a phenomenon that has not been described yet. The results further indicated that strain 2021 can oxidize As 3+ to As 5+ ; here, approximately 13.1% of As 3+ was converted to As 5+ after aerobic cultivation for 8 days at 30 °C. The addition of arsenic could greatly up-regulate the expression of arsR / A / B / C / D and pcaG / H gene clusters involved in arsenic resistance and aromatic hydrocarbon degradation; it also aided in maintaining the continuously high expression of cstA that codes for carbon starvation protein and prmA / B that codes for monooxygenase. These results suggest that strain 2021 holds great potential for the bioremediation of environments contaminated by a combination of arsenic and polycyclic aromatic hydrocarbons. This study provides new insights into the interactions among microbes, as well as inorganic and organic pollutants.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Guijiao Zhao,Chenhuan Wang,Min Kang,Lin Hao,Weihua Liu,Zhi Wang,Xiaodong Shi,Qiuhua Wu
Developing effective methods for highly sensitive detection of phenolic endocrine disruptors (EDCs) is especially urgent. Herein, a magnetic hydroxyl-functional porous organic polymer (M-FH-POP) was facilely synthesized by green diazo-couple reaction using basic fuchsin and hesperetin as monomer for the first time. M-FH-POP delivered superior adsorption performance for phenolic EDCs. The adsorption mechanism was hydrogen bonds, hydrophobic interaction and π-π interplay. With M-FH-POP as adsorbent, a magnetic solid phase extraction method was established for extracting trace phenolic EDCs (bisphenol A, 4- tert -butylphenol, bisphenol F and bisphenol B) in water and fish before ultra-high performance liquid chromatography tandem mass spectrometry analysis. The method displayed low detection limit (S/N = 3) of 0.05–0.15 ng mL −1 for water and 0.08–0.3 ng g −1 for fish. The spiked recoveries were 88.3 %–109.8 % with the relative standard deviations of 2.4 %–6.4 %. The method offers a new strategy for sensitive determination of phenolic EDCs in water and fish samples.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Hua Wang,Lin Hao,Yaxing Guo,Chun Wang,Qiuhua Wu,Zhi Wang
Porous electron-rich organic frameworks have attracted an increased attention in the adsorption and removal of pollutants due to their abundant electron-rich nitrogen atoms, which can effectively interact with positively charged substance. In this study, a porous electron-rich organic framework (Car-POF) and positively charged amino-functionalized magnetic nanoparticles (Fe 3 O 4 -NH 2 ) were used to construct a magnetic electron-rich Fe 3 O 4 -NH 2 @Car-POF for the enrichment of some phenylurea herbicides from water and milk samples prior to high performance liquid chromatographic detection. The adsorption capacity of Fe 3 O 4 -NH 2 @Car-POF for the phenylureas ranged from 14.93 to 28.83 mg g −1 . The LODs were observed in the range of 0.05–0.20 ng mL −1 and 0.5–1.5 ng mL −1 , and LOQs in the range of 0.17–0.66 ng mL −1 and 1.7–5.0 ng mL −1 for water and milk samples with RSD less than 9.0. The adsorption studies with cationic and anionic dyes revealed that Fe 3 O 4 -NH 2 @Car-POF is favorable for the adsorption of positively charged compounds.
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BIORESOURCE TECHNOLOGY
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2016
·
IF 4.917
Yimeng Wang,Jie Wang
The pinewood was pyrolyzed in the first reactor at a heating rate of 10 °C min −1 from room temperature to 700 °C, and the vapor was allowed to be cracked through the second reactor in a temperature range of 450–750 °C without and with HZSM-5. Attempts were made to determine a wide spectrum of gaseous and liquid products, as well as the mass and element partitions to gas, water, bio-oil, coke and char. HZSM-5 showed a preferential deoxygenation effect via the facilitated decarbonylation and decarboxylation with the inhibited dehydration at 550–600 °C. This catalyst also displayed a high selectivity for the formations of aromatic hydrocarbons and olefins by the promoted hydrogen transfer to these products at 550–600 °C. The bio-oil produced with HZSM-5 at 500–600 °C had the yields of 14.5–16.8%, the high heat values of 39.1–42.4 MJ kg −1 , and the energy recoveries of 33–35% (all dry biomass basis).
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JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Nan Dong,Tao Li,Yujie Luo,Lin Shao,Zhu Tao,Chun Zhu
A novel solid-phase microextraction coating that contains perhydroxy cucurbit[6]uril((OH) 12 Q[6]) was prepared by a sol–gel method. (OH) 12 Q[6] was used as a starting coating material with hydroxy-terminated poly(dimethylsiloxane) (OH-PDMS) to bond chemically to a fused-silica substrate using 3-(2-cyclooxypropoxyl)propyltrimethoxysilane as cross-linking agent; hydrolysis and polycondensation reactions then led to the formation of a (OH) 12 Q[6]/PDMS-coating. The coating has a high thermal stability (360 °C), long lifetime and can withstand organic and inorganic solvent rinsing because of the chemical binding between the coating and silica substrate. Its performance was tested by headspace (HS) solid-phase microextraction fiber coupled with gas chromatography to determine polycyclic aromatic hydrocarbon (PAHs) compounds in water samples. The (OH) 12 Q[6]/PDMS-coated fiber exhibited higher enrichment factors from fourfold for naphthalene to tenfold for pyrene compared with commercial PDMS fiber, and the enrichment factors increased with the number of condensed PAH rings. The strong adsorption affinity is believed to be attributed to hydrogen bonding and C H⋯π interactions between PAHs and (OH) 12 Q[6], according to the results of quantum chemical calculations. In the PAH analysis, the (OH) 12 Q[6]-coated fiber showed a good repeatability (< 4.7%) and reproducibility between fibers (< 9.4%), low detection limits (0.03–0.15 μg L −1 ), and a wide linearity (0.1–1000 μg L −1 ) under optimized conditions. This method was used for the simultaneous determination of seven PAHs with satisfactory recoveries of 90.56%–107.4% for Huaxi river water samples and 90.23%–109.5% for local wastewater samples, respectively.
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Materials
·
2017
·Vol. 10
·期 4
·440
·
IF 2.654
Bing Yu,Tao Xu,Hailin Cong,Qiaohong Peng,Muhammad Usman
By using the two-step activated swelling method, monodisperse porous poly(styrene-divinylbenzene) (P(S-DVB)) microparticles were successfully synthesized. The influence of porogens, swelling temperatures and crosslinking agents on the porosity of porous microparticles was carefully investigated. Porous P(S-DVB) microparticles were used as a packing material for high performance liquid chromatography (HPLC). Several benzene analogues were effectively separated in a stainless-steel column as short as 75 mm due to the high specific surface area of the porous microparticles. Porous P(S-DVB) microparticles were further sulfonated and subsequently modified with diazoresin (DR) via electrostatic self-assembly and UV (ultraviolet) radiation. After treatment with UV light, the ionic bonding between sulfonated P(S-DVB) and DR was converted into covalent bonding through a unique photochemistry reaction of DR. Depending on the chemical structure of DR and mobile phase composition, the DR-modified P(S-DVB) stationary phase performed different separation mechanisms, including reversed phase (RP) and hydrophilic interactions. Therefore, baseline separations of benzene analogues and organic acids were achieved by using the DR-modified P(S-DVB) particles as packing materials in HPLC. According to the π–π interactional difference between carbon rings of fullerenes and benzene rings of DR, C60and C70were also well separated in the HPLC column packed with DR-modified P(S-DVB) particles.Keywords:polystyrene;seeded polymerization;macroporous structures;diazoresin;high performance liquid chromatography
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 11
·5240-5251
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IF 2.302
Yu Bing,Tian Chao,Cong Hailin,Xu Tao
Monodisperse poly(styrene- co -divinylbenzene) (PS-DVB) microspheres with binary porous structures were synthesized using a modified seeded polymerization method. The microspheres had small pores on the surface and big pores in the middle. Using the binary porous PS-DVB (BPPSD) microspheres as packing materials for high-performance liquid chromatography, several benzene analogs were effectively separated in a column as short as 75 mm due to the high surface areas of the stationary phase. Because of the π–π affinity interaction between BPPSD particles and analytes, the separation performance of the BPPSD column was better than commercialized C 18 column at the same conditions. Compared to column filled with non-porous PS-DVB particles, the back pressure of BPPSD column could be maintained at especially low level even at high flow rates due to the excellent permeability of the fillers. In addition, approximate baseline separation of C 60 and C 70 was also achieved in the 75 mm BPPSD column.
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OPTICS EXPRESS
·
2016
·Vol. 24
·期 14
·A1148
·
IF 3.148
Ruifang Yang,Nanjing Zhao,Xue Xiao,Gaofang Yin,Shaohui Yu,Jianguo Liu,Wenqing Liu
It is still difficult to determine the concentrations of polycyclic aromatic hydrocarbons accurately in natural water by fluorescence technique because of their low solubility, different fluorescent intensity, and the complex interferents from water environments. In this work, three-way fluorescence spectra combined with three methods including three-way parallel factor analysis, multi-way partial least square with residual bilinearization and unfolded partial least square with residual bilinearization were used to predict the concentrations of polycyclic aromatic hydrocarbons at the μg L−1 level in reservoir and river water, respectively. The prediction abilities of these methods on different analytes were evaluated by validation sets. The results demonstrate that unfolded partial least square with residual bilinearization yields the optimal results with relative error less than or equal to 6% for phenanthrene, pyrene, anthracene and fluorene, and 35% for acenaphthene and fluoranthene in different water backgrounds.
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TALANTA
·
2017
·
IF 4.162
Yanzhe Li,Zhe Sheng,Chuanlei Zhu,Wei Yin,Changhu Chu
Crown ether is a type of typical macrocyclic polyether compounds, which can produce strong interactions with cationic species, such as metal ions and protonated amines due to its cavity structure and the strong electronegative effect of heteroatoms on the crown ether ring. In this paper, a type of silica based crown ether stationary phase was prepared by covalently bonding dibenzo-18-crown 6-ether (DBCE) on silica gel via copper (I) catalyzed azide-alkyne 1,3-dipolar cycloaddition (CuAAC). The tetraazido DBCE was rapidly prepared by bromomethylation and subsequent azido substitution of DBCE. Finally, this key intermediate was covalently bonded to silica beads by click chemistry to get click-DBCE. Its structure was confirmed by FT-IR and elemental analysis, and the structures of all related intermediates were confirmed by NMR, IR and MS spectra. The crown ether based stationary phase showed good chromatography characteristics and column efficiency (up to 43,553 plates m -1 theoretical plate number is obtained in the case of fluoranthene) under reverse phase liquid chromatographic (RPLC) model. The primary chromatographic evaluation showed that click-DBCE displayed better chromatography efficiency than commercial C18 stationary phase (THERMO BDS HYPERSIL), when they were applied in the separation of regio-isomers of benzene, polycyclic aromatic hydrocarbons (PAHs) and macrolide pharmaceuticals. Furthermore, this stationary phase could also be used to separate fullerenes under normal phase mode, and in this case, 1-chloronaphthalene was suitable additive for improving chromatographic separation ability.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 7
·2171-2180
·
IF 4.58
Wu Tong,Wang Juntao,Liang Weiqian,Zang Xiaohuan,Wang Chun,Wu Qiuhua,Wang Zhi
The authors describe a three-dimensional single layer graphitic carbon nitride-modified graphene composite (g-C 3 N 4 @G) deposited on a stainless steel wire by a sol-gel technique. The coated fiber was applied to direct immersion solid-phase microextraction of trace levels of polycyclic aromatic hydrocarbons (PAHs) from cosmetics samples prior to their determination by gas chromatography with mass spectrometry (GC-MS). Due to π stacking interaction and hydrophobic interaction between the g-C 3 N 4 @G coating and the analytes (naphthalene, acenaphthene, fluorene, phenanthrene, fluoranthene and pyrene), the fiber displays an excellent adsorption capability for the analytes. Under optimized conditions, the method has a wide linear range, low LODs (from 1.0 to 2.0 ng L −1 ), good repeatability and high recoveries. It was successfully applied to the determination of PAHs in cosmetics. The g-C 3 N 4 @G fiber also exhibited good durability.
Schematic of a three-dimensional single layer graphitic carbon nitride-modified graphene composite (g-C 3 N 4 @G) that was coated onto a stainless steel wire for the direct-immersion solid phase microextraction of trace levels of polycyclic aromatic hydrocarbons prior to gas chromatography-mass spectrometric detection.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Shi Zhou,Peng Guo,Jinlian Li,Lingren Meng,Hongfu Gao,Xing Yuan,Dongmei Wu
Fluorene was one of the priority controlled polycyclic aromatic hydrocarbons (PAHs) and distributed abundantly in the environment, which has a great harmful on human body. It was very important to detect the cytotoxicity of fluorene with a rapid and accurate method. In this present work, a simple and ultrasensitive electrochemical biosensor was developed by electrodeposition of reduced graphene oxide quantum dots (RGOQDs) on glassy carbon electrode (GCE) for the first time. The electrochemical behaviors of uric acid (UA), xanthine (X) and guanine (G) were studied on RGOQDs/GCE by differential pulse voltammetry (DPV) with a limit of detection of 0.024 μM, respectively. Then the electrochemical biosensor was used to evaluate the cytotoxicity of fluorene for MCF-7 cells based on the variation of G/X in MCF-7 cells solution. The result showed that fluorene exposed to MCF-7 cells at the concentration range of 0–0.05 mM could promote cell proliferation, the concentration above 0.05 mM exhibited inhibitory effect, which was verified by methyl-thiazolyl-tetrazolium (MTT) assay. The electrochemical biosensor based on RGOQDs/GCE could be used not only for evaluation the cytotoxicity of PAHs, but also for detection the physiological process related to intracellular purine nucleotide metabolism.
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Arabian Journal of Chemistry
·
2015
·
IF 3.725
Chukwunonso Peter Okoli,Gregory Olufemi Adewuyi,Qian Zhang,Guangxu Zhu,Chungyu Wang,Qingjun Guo
Cross linking of starch molecules with suitable reagents provides opportunity for incorporation of relevant functional groups, thereby tuning the adsorption properties of the starch polymer adsorbent towards target pollutants, as a function of the nature of the cross linking agent and the chemical identity of the pollutants. In this vein, this study assessed the applicability of epichlorohydrin cross-linked starch (EPIS), 1,6-hexamethylene diisocyanate cross-linked starch (HDIS), and 4,4-methylene diphenyl diisocyanate cross-linked starch (MDIS) polymer adsorbents for treatment of aqueous Polycyclic Aromatic Hydrocarbon (PAHs) pollution in environmental water samples. Cross-linking process led to improvement in surface characteristics, level of hydrophobicity, and incorporation of relevant functional groups. Adsorption capacities of the adsorbents were in the order of MDIS > HDIS > EPIS. PAHs molecules were adsorbed in multi-layer, in a flat-wise orientation, while external and internal diffusion dominated the adsorption kinetics. Adsorption mechanisms suggested that these adsorbents spontaneously adsorb PAHs molecules driven mainly by enthalpy change, and the adsorption process was attributed to physisorption involving hydrophobic, van der Waals and π–π interactions between adsorbent and adsorbates. The thermodynamic evaluation indicated that the adsorption process was majorly endothermic and spontaneous. Desorption studies indicated that the adsorbents can be efficiently regenerated. The adsorbents were effective in treating simulated and real environmental water samples, and hence, are promising cost-effective alternative for control of aqueous PAHs pollution.
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