TALANTA
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2018
·
IF 4.244
Lu Qiu,Qi Liu,Xiaoliang Zeng,Qin Liu,Xiandeng Hou,Yunfei Tian,Li Wu
In this work, a facile method coupling solid phase microextraction (SPME) with surface enhanced Raman spectroscopy (SERS) was developed for the detection of trace bisphenol A (BPA). Monolayer graphene-coated Ag nanoparticles (Ag NPs) were fabricated on the Si fiber, which made the Si fiber retain functions of both as a SERS-active substrate and SPME fiber to realize in situ rapid determination of BPA. The SERS-active SPME fiber was immersed in water to extract BPA prior to its detection by SERS. The relative standard deviation (RSD) values of the uniformity and the reproducibility of the SERS-active SPME fiber are 14% and 13%, respectively. The characteristic SERS intensity versus BPA concentration showed a linear relationship (R 2 = 0.958). Due to the combination of the SERS method with SPME, this method exhibits extremely high sensitivity and excellent stability for the detection of BPA, with a limit of detection as low as 1 μg L −1 . The method was successfully used for the determination of BPA in water samples with spiked recoveries ranging from 97% to 110%. Compared to the conventional SERS methods used for the detection of BPA, the present method not only retains the advantages of SERS but also provides several unique advantages including preconcentration of analytes, separation of analyte from sample matrices and improvement of sensitivity, thus making its promising application in environmental analysis of BPA.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2018
·
IF 6.434
Yonghua Wang,Min Rui,Yang Nie,Guanghua Lu
Oral exposure is a major route of human bisphenol A (BPA) exposure. However, influence of gastrointestinal tract on BPA metabolism is unavailable. In this study, in vitro simulator of the human intestinal microbial ecosystem (SHIME) was applied to investigate the changes in bioaccessibility and metabolism of BPA in different parts of gastrointestinal tract (stomach, small intestine and colon). Then the human hepatoma cell line HepG2 was employed to compare toxic effects of BPA itself and effluents of SHIME system on hepatic gene expression profiles. Results showed that level of bioaccessible BPA decreased with the process of gastrointestinal digestion. But the gastrointestinal digestion could not completely degrade BPA. Then, BPA exposure significantly changed microbial community in colons and increased the percentage of microbes shared in ascending, transverse and descending colons. Abundances of BPA-degradable bacteria, such as Microbacterium and Alcaligenes , were up-regulated. Further, SHIME effluents significantly up-regulated expressions of genes related to estrogenic effect and oxidative stress compared to BPA itself, but reduced or had little change on the risk of cell apoptosis and fatty deposits. This study sheds new lights on influence of gastrointestinal digestion on bioaccessibility and toxic effects of BPA.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Shanshan Yang,Pingxiao Wu,Junqin Liu,Meiqing Chen,Zubair Ahmed,Nengwu Zhu
For eliminating organic pollutants from wastewater, Fe 0 or Fe 0 -composites as catalyst for peroxymonosulfate (PMS) activation have attracted increasing attention in advanced oxidation processes. In this work, a novel Fe 0 -montmorillonite composites (Fe-Mt-C-H 2 ) have been prepared by thermal reduction and used as an activator for PMS to remove bisphenol A (BPA). The removal efficiency of BPA (25 mg·L −1 ) and total organic carbon (TOC) were 99.3% and 70.6%, respectively, in the presence of Fe-Mt-C-H 2 (0.4 g·L −1 ) and PMS (1 mM) at pH of 3. Electron paramagnetic resonance (EPR) spectroscopy and radical scavenger studies demonstrated that superoxide radical (O 2 − ) and singlet oxygen ( 1 O 2 ) were the crucial reactive oxygen species (ROS) in the Fe-Mt-C-H 2 /PMS system rather than sulfate (SO 4 − ) and hydroxyl radical (·OH). Besides, it was found that pH had a great influence on the catalytic oxidation rate of BPA and the Fe-Mt-C-H 2 exhibited best catalytic performance and reusability at initial pH of 3. Furthermore, the constituents of the iron surface oxidation layer at different initial pH were investigated with X-ray photoelectron spectroscopy studies, which indicated that the major constituents were Fe 3 O 4 in acidic solution and contained α-Fe 2 O 3 , FeO and FeSO 4 (s) in alkaline or neutral solution. The findings of this study provide new insights into the activation mechanism of PMS by Fe 0 -composites and exhibit a promising application of Fe-Mt-C-H 2 in wastewater treatment.
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COMPOSITE STRUCTURES
·
2018
·
IF 4.101
Aboubakr Medjahed,Mehdi Derradji,Abdeldjalil Zegaoui,Ruizhi Wu,Bingcheng Li
In this study, novel fiber-metal laminates (Al-LiFMLs) were manufactured by the lay-up process using the basalt fibers/phthalonitrile (BFs/PN) composite and the Al-Li alloy. Their mechanical and gamma rays (γ-rays) shielding properties were tested and analyzed then compared to the monolithic alloy. The results indicated that the variation in the number of composite (BFs/PN) plies significantly affected the tensile and shielding properties. The mechanical properties of the Al-LiFMLs showed improvements over the properties of both the individual neat Al-Li alloys and BFs/PN composite materials. For instance, when the number of composite layers varied from 1 to 8, the ultimate tensile strength of the Al-LiFMLs increased from 216 to 483 MPa. It was found that the failure strain displayed a more ductile behavior up to about 20% for all the developed Al-LiFMLs influenced by the ductile fracture mode of the Al-Li alloy. These enhancements were due to the good combination of the composite’s high strength and the metal’s superior ductility as well as the excellent adhesion achieved between the Al-LiFMLs constituents. Moreover, the Al-LiFMLs also revealed an effective gamma rays shielding with screening ratios ranging from 25 to 43% depending on the number of composite plies .
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Environmental Science-Nano
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2018
·Vol. 5
·期 8
·1834-1843
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IF 6.087
Zehui Li,Yuheng Jiang,Chenming Liu,Zhuoya Wang,Zhiqin Cao,Yi Yuan,Mingjie Li,Yaling Wang,Daliang Fang,Zhuang Guo,Dongbin Wang,Guangjin Zhang,Jingkun Jiang
Hydrogen peroxide (H2O2) is a key species in many environmental processes such as the electro-Fenton system to remove organic pollutants in wastewater treatment. Traditional methods for measuring H2O2 are often complex and time-consuming. Due to their low cost and high catalytic activity, transition metals (TM) can be used as high-performance electrochemical sensing materials for detecting H2O2. However, the aggregation of metal atoms will severely limit their catalytic efficiency and exposure area. In this study, we explored a method to disperse TM homogeneously on a zeolitic imidazolate framework-8 (ZIF-8) derived nitrogen-doped carbon (N/C) nanoframework and used it as the electrocatalyst for detecting H2O2 in an electro-Fenton system. Cu and Mn were used as the examples. Benefitting from the homogeneously dispersed TM, the synthesized nanoframework with a low content of TM exhibits superior electrocatalytic activity and an anti-interference ability in detecting H2O2. It has a wide linear range (0.0005–50 mM for 1% Cu–N/C and 0.0001–50 mM for 1% Mn–N/C) and a low detection limit (0.047 μM for 1% Cu–N/C and 0.036 μM for 1% Mn–N/C). Using the synthesized nanoframework, a system for continuously detecting the H2O2 concentration in an electro-Fenton system in situ was presented. The reported method to fabricate such nanomaterials with a higher catalytic efficiency of TM has implications in other applications such as environmental treatment, catalysis, and energy conversion.
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ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Penghui Ding,Jun Di,Xiaoliu Chen,Mengxia Ji,Kaizhi Gu,Sheng Yin,Gaopeng Liu,Fei Zhang,Jiexiang Xia,Huaming Li
In this study, S, N codoped graphene quantum dots/(BiO)2CO3 hollow microspheres have been fabricated by a facile electrostatic self-assembly method. The nanosized S, N:GQDs, which can be obtained by a bottom-up approach, are superior surface modification materials for photocatalytic applications due to their better electron transfer and peroxidase mimetic properties. The excellent oxidation property of the synthesized nanocomposite is confirmed by degradation of different model pollutants, such as rhodamine B, tetracycline, and bisphenol A under light irradiation or dark situation. Based on several experiments, the essential roles of S, N:GQDs can be described as (i) a photocarrier transport center strengthening photoinduced charge carriers (h+–e–) separation and (ii) an enzymatic-like catalysis center to accelerate H2O2 decomposition to produce ·OH because the surface accumulation of H2O2 is harmful for photocatalytic processes. The present work may pave the way for integrating enzymatic-like cocatalysis into a photocatalytic process to generate more reactive oxygen species, thus advancing the field of environmental remediation and synthetic chemistry.
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Food Analytical Methods
·
2018
·Vol. 12
·期 3
·705-711
·
IF 2.245
Tu Xijuan,Wu Siyuan,Liu Weiyi,Gao Zhaosheng,Huang Shaokang,Chen Wenbin
An analytical method based on sugaring-out assisted liquid-liquid extraction (SULLE) and HPLC-fluorescence detection has been developed for the determination of bisphenol A (BPA) and bisphenol B (BPB) in royal jelly. Experimental parameters of SULLE including the extraction solvent, amount of phase separation agent, initial concentration of acetonitrile (ACN), and sample size were investigated. The optimal SULLE procedure involves 0.3 g sample extracted by 2 mL ACN-water mixture (50%, v / v ), followed by phase separation with the addition of 0.4 g glucose. The obtained extract was injected into the reversed-phase HPLC system without clean-up step. The chromatography separation of BPA and BPB from royal jelly matrix was achieved in the mobile phase composed of 40% ACN and 60% water with isocratic elution at 1.0 mL/min. Limits of quantification for BPA and BPB were 40 μg/kg and 45 μg/kg, respectively, and limits of detection for BPA and BPB were 16 μg/kg and 18 μg/kg, respectively. Average recoveries of BPA and BPB at three spiked levels were in the range of 88.32~93.59% and 95.14~97.48%, respectively. Precision expressed as relative standard deviations (RSDs) in the interday and intraday analysis were all lower than 5%. The developed method was applied to the analysis of ten commercial and eight raw royal jelly samples. Results indicated that none of BPA and BPB were detected in these 18 samples. The proposed method is simple, fast, and sensitive, and could be used for the monitoring of BPA and BPB contamination in royal jelly.
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POLYMER COMPOSITES
·
2018
·
IF 1.943
Mehdi Derradji,Abdeldjalil Zegaoui,Aboubakr Medjahed,Abdul Qadeer Dayo,Jun Wang,Yitagesu Bereket Arse,Wen-bin Liu,Yu-Guang Liu
This work relates for the first time ever the use of natural fibers to reinforce the high performance phthalonitrile resins. The excellent thermal stability of the basalt fibers (BFs) allows them to be the only natural fibers resisting the high curing temperatures of the phthalonitrile resins. Based on this promising combination, high performance polymer composites were prepared and their performances were scrutinized in terms of mechanical properties and nuclear shielding efficiency. The BFs which initially underwent a silane surface modification provided materials with metal equivalent tensile and flexural properties. For instance, the composite containing 15 plies of treated fibers achieved the tensile and flexural strengths of 700 and 780 MPa, respectively. Additionally, the same composite stopped 36% of the incident highly ionizing gamma rays. Meanwhile, morphological investigations further confirmed the enhancement seen in the mechanical properties. Overall, the studied composites can be used as advanced materials in extremely exigent applications. POLYM. COMPOS., 40:E912–E919, 2019. © 2018 Society of Plastics Engineers
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WATER RESEARCH
·
2018
·
IF 7.051
Rui Luo,Miaoqing Li,Chaohai Wang,Ming Zhang,Muhammad Abdul Nasir Khan,Xiuyun Sun,Jinyou Shen,Weiqing Han,Lianjun Wang,Jiansheng Li
The degradation of organic contaminants under high salinity condition is still a challenge for environmental remediation due to the inhibiting effect resulted from the side reactions between radicals and anions. Here, we demonstrate the non-radical oxidation process via peroxymonosulfate (PMS) activation by metal-free carbon catalyst for efficiently decomposing bisphenol A (BPA) in saline water. The nitrogen-doped graphitic carbon (NGC700) exhibits excellent catalytic activity for depredating BPA at acid and neutral pH. Based on the scavenger experiments and electron paramagnetic resonance (EPR) analyses, the mechanism of catalytic oxidation was elucidated as the non-radical pathway, and singlet oxygen was identified as the primary reactive species. Experiments on the influence of anions (5–500 mM) further show that the inhibiting effect was overcame due to the non-radical process. Interestingly, Cl − markedly facilitated the catalytic performance by generating HOCl in the catalytic process. The results highlight leveraging the non-radical pathway dominated by singlet oxygen to conquer the inhibitory effect of anions in NGC700/PMS system, which represents a crucial step towards environmental remediation under high salinity condition.
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高影响因子
ENVIRONMENTAL POLLUTION
·
2018
·
IF 4.358
Lun Lu,Baoliang Chen
A high-efficient, low-cost, and practical biochar implementation method is desired to extend biochar's powerful adsorption performance for environmental remediation. This study presents novel results with advanced biochar application by integrating biochar with biofilter for the removal of bisphenol A (BPA) from stormwater . Biochars derived from wood dust (BC0) at different pyrolytic temperatures (300, 500, and 700 °C, referred as, BC300, BC500, and BC700, respectively) were characterized and investigated for their adsorption of BPA under different pH levels and humic acid (HA) concentrations by batch sorption and fixed-bed column experiments. Microcosm biofilters vegetated with phragmites australis and amended with different biochars were constructed and used for BPA removal under different hydraulic loading rates (HLRs). Compared with other biochars, BC700 showed a high adsorption rate and capacity due to high specific surface area and pore volume. As a consequence, fixed-bed columns amended with BC700 can remove BPA more efficiently than columns with BC0, BC300, and BC500 from synthetic stormwater, though the treatment performance was affected relatively by pH change and HA concentration. A high correlation ( r 2 = 0.899) between the breakthrough time and the product of adsorption rate ( k 2 ) and capacity ( Q max ) was found, which suggests that batch sorption experiments could be an efficient tool for prediction of breakthrough time. The BPA removal efficiency of microcosm biofilters amended with BC0, BC300, BC500 and BC700 for real stormwater containing 200 μg/L BPA at HLR of 40 cm/h averaged 4.1, 10.8, 80.3, and 98.4%, which were about 6, 15, 115, and 141 times, respectively, compared to bilfitlers without biochar amendment. Moreover, biochar amendment not only enhanced the BPA removal but also promoted phragmites australis growth, elevated nutrients and increased the E. coli removal efficiency. Hence, biochar-amended biofilters could be a promising approach for enhancing the elimination of endocrine-disrupting chemicals such as BPA from aqueous environments.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Haichao Fu,Peng Zhao,Shengjun Xu,Gong Cheng,Zhuoqian Li,Yi Li,Kai Li,Shuanglong Ma
The novel Fe 3 O 4 and porous biochar originated from Myriophyllum aquaticum composites (Fe 3 O 4 /MC) with graphitized structure, hierarchical porous and strong magnetism were used as efficient catalysts for degradation of organic pollutants in the presence of peroxymonosulfate (PMS). Three types of catalysts pyrolyzed at 600, 700, 800 °C manifested quit different PMS activation effect with the much better p-hydroxybenzoic acid (HBA) degradation efficiency at 700 and 800 °C than that of 600 °C, which was assigned to the high graphitization degree and mesopores ration of catalysts pyrolyzed at higher temperature. Based on radicals quenching experiments and electron paramagnetic resonance (EPR) analyses, the radical pathway dominated by surface-bound SO 4 − was the prevailing way while the non-radical pathway performed as electro-transfer was the recessive way during the degradation process. The large amount of surface-bound SO 4 − radicals were produced through the reduction of PMS by Fe(II), which was regenerated by participation of O 2 − /O 2 . The non-radical pathway was achieved by the graphitized structure which acted as electron transfer bridges accepting electrons form organic pollutants and denoting electrons to PMS. Six HBA intermediates were detected and the possible HBA degradation pathway was proposed tentatively. Consequently, the conversion of Myriophyllum aquaticum to composite catalyst provides a brand-new idea for efficient utilization of waste biomass in a high value-added way and simultaneously achieving the contaminants elimination.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Lingshuai Kong,Guodong Fang,Yufeng Chen,Meng Xie,Feng Zhu,Long Ma,Dongmei Zhou,Jinhua Zhan
In this study, a flower-like Cu 2 FeSnS 4 (CFTS) nanomaterial was applied to the activation of persulfate (PS) for the degradation of bisphenol A (BPA) in model industrial wastewater. The efficiency of PS decomposition by CFTS, and the mechanism of contaminant degradation by SO 4 − were investigated. The results revealed that CFTS catalyzes PS decomposition more efficiently than the monometallic Cu/Fe/Sn sulfides and exhibits activity over a wide pH range. Electron spin resonance spectroscopy, X-ray photoelectron spectroscopy, and free radical quenching experiments revealed a tandem synergistic effect between Cu, Fe, and Sn in their quaternary chalcogenide systems upon PS activation. The intrinsic electron transfer between Cu, Fe and Sn, especially the Fe(II)* species formed upon the complexation of Fe(II) by S on the surface of the CFTS, overcomes the inhibition of the M (n+1)+ /M n+ redox cycle. CFTS shows promise as a catalyst for wastewater treatment.
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危险品化学品经营许可证（带存储）