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Chemically activated carbon nanofibers for adsorptive removal of bisphenol-A:Batch adsorption and breakthrough curve study
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作者 Wenming Hao Basma I.Waisi +1 位作者 Timothy M.Vadas Jeffrey R.McCutcheon 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第9期248-259,共12页
Activated carbon nanofibers(ACNFs)with small diameter can significantly increase the accessibility of intra pores and accelerate adsorption of molecules from water.In this study,ACNFs were made by blending K_(2)CO_(3)... Activated carbon nanofibers(ACNFs)with small diameter can significantly increase the accessibility of intra pores and accelerate adsorption of molecules from water.In this study,ACNFs were made by blending K_(2)CO_(3)or ZnCl_(2)as the activating agent into the polyacrylonitrile(PAN)in dimethylformamide solution for electrospinning prior to pyrolysis.Bisphenol-A(BPA),an endocrine disruption pollutant,is widely applied in the production of polycarbonate plastics and epoxy resins.Accordingly,BPA is often used as a model contaminant commonly removed via adsorption.Batch adsorption studies were used to evaluate the kinetics and adsorption capacity of the ACNFs.Redlich-Peterson(R-P)and Langmuir models were found to fit the isotherm of BPA adsorption better than Freundlich model,showing the homogeneous nature of the PAN originated ACNFs.The adsorption kinetics was better described by the pseudo second-order model than that by the pseudo first-order model.The fitting by intraparticle diffusion model indicates the adsorption of BPA onto ACNFs is mainly controlled by pore diffusion.High pH value and ionic strength reduced BPA adsorption from aqueous solution.The breakthrough curves studied in two different fixed bed systems(cross flow bed system and packed flow bed system)confirmed the scalability of BPA removal by ACNFs in dynamic adsorption processes.The modified dose-response model predicted well the fixed-bed outlet concentration profiles. 展开更多
关键词 Activated carbon nanofibers(ACNFs) Chemical activation bisphenol-a(BPA) Fixed bed ADSORPTION
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STRUCTURE AND PROPERTIES OF PHOSPHROUS-CONTAINING POLY(ARYLETHER KETONE)WITH BISPHENOL-A MOIETY 被引量:1
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作者 Kai-jun Li Xiao-ting Chen Hao Sun Xu-dong Tang 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2007年第6期651-655,共5页
A phosphrous-containing poly(aryl ether ketone) was synthesized derived from bisphenol-A and bis[4-(4- fluorobenzoyl)phenyl] phenyl phosphine oxide (FPPPO) by nucleophilic substitution reaction. The structure of... A phosphrous-containing poly(aryl ether ketone) was synthesized derived from bisphenol-A and bis[4-(4- fluorobenzoyl)phenyl] phenyl phosphine oxide (FPPPO) by nucleophilic substitution reaction. The structure of the polymer was characterized by FT-IR, ^1H-NMR and ^31p-NMR. The thermal property of the PAEK was measured by DSC and TGA. The glass transition temperature (Tg) of the polymer was 205℃, and the 5% weight loss temperature under nitrogen was 475℃. Good solubility of the polymer in organic solvents, such as N-methylpyrrolidone, dimethylformamide, dimethylacetamide, dimethylsulfoxide and chloroalkanes was observed, flexible film was obtained from the polymer's CH2Cl2 solution. The limiting oxygen index (LOI) of the PAEK was 40, which indicated that organic phosphorus moiety can offer good flame retardant property to the polymer. 展开更多
关键词 Poly(aryl ether ketone) Bis[4-(4-fluorobenzoyl)phenyl] phenyl phosphine oxide (FPPPO) Nucleophilic substitution reaction bisphenol-a.
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PREPARATION OF LIQUID CRYSTALLINE COPOLYESTERS WITH SPACERS BASED ON BISPHENOL-A,BISPHENOL-S OR POLYSULFONE BY DIRECT POLYCONDENSATION
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作者 汪平平 张鸿志 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1989年第1期9-15,共7页
Four series of copolyesters were synthesized by direct polycondonsation reaction between aromatic dicarboxylic acids and bisphenols by using tosyi chloride and N, N-dimethylformamide ( DMF ) in pyridine under mild con... Four series of copolyesters were synthesized by direct polycondonsation reaction between aromatic dicarboxylic acids and bisphenols by using tosyi chloride and N, N-dimethylformamide ( DMF ) in pyridine under mild conditions. The electron-rich hydroxyl groups of bisphenols favoured the polycondensation reaction and the order of relative reactivities of bisphenols is as follow:bisphenoI-A> hydroquinone ~ bisphenol-S> chlorohydroquinone. The mesomorphic properties of copolyesters were examined by birefringence under polarizing microscope, melt transparency. DSC and X-ray diffraction. The minimum molar fraction of mesogenic units needed for the appearance of liquid crystallinity is not higher than 0. 1 despite of the different varieties and lengths of the spacers studied. 展开更多
关键词 TPA PREPARATION OF LIQUID CRYSTALLINE COPOLYESTERS WITH SPACERS BASED ON bisphenol-a BISPHENOL-S OR POLYSULFONE BY DIRECT POLYCONDENSATION BPA BPS IPA
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Overlooked interaction between redox-mediator and bisphenol-A in permanganate oxidation
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作者 Honglong Zhang Qiaoqiao Zhao +5 位作者 Kangbao Zhong Ruopeng Bai Jiaojiao Dong Jun Ma Jing Zhang Timothy J.Strathmann 《Environmental Science and Ecotechnology》 SCIE 2024年第5期248-255,共8页
Research efforts on permanganate(Mn(VII))combined with redox-mediator(RM),have received increasing attention due to their significant performance for bisphenol-A(BPA)removal.However,the mechanisms underpinning BPA deg... Research efforts on permanganate(Mn(VII))combined with redox-mediator(RM),have received increasing attention due to their significant performance for bisphenol-A(BPA)removal.However,the mechanisms underpinning BPA degradation remain underexplored.Here we show the overlooked interactions between RM and BPA during permanganate oxidation by introducing an RMdN-hydroxyphthalimide(NHPI).We discovered that the concurrent generation of MnO_(2) and phthalimide-N-oxyl(PINO)radical significantly enhances BPA oxidation within the pH range of 5.0e6.0.The detection of radical cross-coupling products between PINO radicals and BPA or its derivatives corroborates the pivotal role of radical cross-coupling in BPA oxidation.Intriguingly,we observed the formation of an NHPI-BPA complex,which undergoes preferential oxidation by Mn(VII),marked by the emergence of an electronrich domain in NHPI.These findings unveil the underlying mechanisms in the Mn(VII)/RM system and bridge the knowledge gap concerning BPA transformation via complexation.This research paves the way for further exploration into optimizing complexation sites and RM dosage,significantly enhancing the system's efficiency in water treatment applications. 展开更多
关键词 PERMANGANATE Redox-mediator bisphenol-a Radical cross-coupling COMPLEXATION
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Degradation of bisphenol-A using ultrasonic irradiation assisted by low-concentration hydrogen peroxide 被引量:9
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作者 Kejia Zhang Naiyun Gao +4 位作者 Yang Deng Tsair Fuh Lin Yan Ma Lei Li Minghao Sui 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2011年第1期31-36,共6页
This study investigated the degradation of bisphenol-A (BPA) by ultrasonic irradiation in the presence of different additives (H2O2, air bubbles and humic acid) under various operating conditions, i.e., ultrasonic... This study investigated the degradation of bisphenol-A (BPA) by ultrasonic irradiation in the presence of different additives (H2O2, air bubbles and humic acid) under various operating conditions, i.e., ultrasonic frequency, power intensity and power density. The results demonstrated that the BPA degradation followed pseudo first-order kinetics under different experimental conditions. The optimum power intensities were 0.9, 1.8, and 3.0 W/cm2 at the frequencies of 400, 670, and 800 kHz, respectively. At the fixed frequency (800 kHz), the degradation rate of BPA was shown proportional to the increase of power density applied. With this manner, the BPA sonolysis could be facilitated at H202 dosage being lower than 0.1 mmol/L; while BPA degradation was hindered at H202 concentration in excess of 1 mmol/L. Additionally, BPA removal was shown to be inhibited by the presence of aeration and humic acid during ultrasonic irradiation. The present study suggested that the degradation rate of BPA assisted by ultrasonic irradiation was influenced by a variety of factors, and high BPA removal rate could be achieved under appropriate conditions. 展开更多
关键词 bisphenol-a (BPA) ultrasonic irradiation power density ADDITIVES
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Zn Cl_2-modified ion exchange resin as an efficient catalyst for the bisphenol-A production 被引量:5
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作者 Bao-He Wang Jin-Shi Dong +2 位作者 Shuang Chen Li-Li Wang Jing Zhu 《Chinese Chemical Letters》 SCIE CAS CSCD 2014年第11期1423-1427,共5页
A Zn Cl2-modified ion exchange resin as the catalyst for bisphenol-A synthesis was prepared by the ion exchange method. Scanning electron microscope(SEM), Fourier transform infrared spectrophotometer(FT-IR), therm... A Zn Cl2-modified ion exchange resin as the catalyst for bisphenol-A synthesis was prepared by the ion exchange method. Scanning electron microscope(SEM), Fourier transform infrared spectrophotometer(FT-IR), thermo gravimetric analyzer(TGA) and pyridine adsorbed IR were employed to characterize the catalyst. As a result, the modified catalyst showed high acidity and good thermal stability. Zn2+coordinated with a sulfonic acid group to form a stable active site, which effectively decreased the deactivation caused by the degradation of sulfonic acid. Thus the prepared catalyst exhibited excellent catalytic activity, selectivity and stability compared to the unmodified counterpart. 展开更多
关键词 Zinc chloride Ion exchange resin Modification bisphenol-a
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Effects of bisphenol compounds on the growth and epithelial mesenchymal transition of MCF-7 CV human breast cancer cells 被引量:4
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作者 Ji-Youn Kim Ho-Gyu Choi +3 位作者 Hae-Miru Lee Geum-A Lee Kyung-A Hwang Kyung-Chul Choi 《The Journal of Biomedical Research》 CAS CSCD 2017年第4期358-369,共12页
Bisphenol-A(BPA) has been considered as an endocrine disrupting chemical(EDC) because it can exert estrogenic properties.For bisphenol-S(BPS) and bisphenol-F(BPF) that are BPA analogs and substitutes,their ris... Bisphenol-A(BPA) has been considered as an endocrine disrupting chemical(EDC) because it can exert estrogenic properties.For bisphenol-S(BPS) and bisphenol-F(BPF) that are BPA analogs and substitutes,their risk to estrogendependent cancer has been reported rarely compared with the numerous cases of BPA.In this study,we examined whether BPA,BPS,and BPF can lead to the proliferation,migration,and epithelial mesenchymal transition(EMT) of MCF-7 clonal variant(MCF-7 CV) breast cancer cells expressing estrogen receptors(ERs).In a cell viability assay,BPA,BPS,and BPF significantly increased proliferation of MCF-7 CV cells compared to control(DMSO) as did17β-estradiol(E2).In Western blotting assay,BPA,BPS,and BPF enhanced the protein expression of cell cycle progression genes such as cyclin D1 and E1.In addition,MCF-7 CV cells lost cell to cell contacts and acquired fibroblast-like morphology by the treatment of BPA,BPS,or BPF for 24 hours.In cell migration assay,BPA,BPS,and BPF accelerated the migration capability of MCF-7 CV cells as did E2.In relation with the EMT process,BPA,BPS,and BPF increased the protein expression of N-cadherin,while they decreased the protein expression of Ecadherin.When BPA,BPS,and BPF were co-treated with ICI 182,780,an ER antagonist,proliferation effects were reversed,the expression of cyclin D1 and cyclin E1 was downregulated,and the altered cell migration and expression of N-cadherin and E-cadherin by BPA,BPS,and BPF were restored to the control level.Thus,these results imply that BPS and BPF also have the risk of breast cancer progression as much as BPA in the induction of proliferation and migration of MCF-7 CV cells by regulating the protein expression of cell cycle-related genes and EMT markers via the ER-dependent pathway. 展开更多
关键词 human breast cancer cells endocrine disrupting chemicals bisphenol-a bisphenol-S bisphenol-F epithelial-mesenchymal transition migration
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Rapid Lab-Scale Microwave-Assisted Extraction and Analysis of Anthropogenic Organic Chemicals in River Sediments
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作者 Thomas J Brown Chad A Kinney 《International Journal of Geosciences》 2011年第3期267-273,共7页
An Ethos EZ Microwave Lab Station is employed in the development of a robust and efficient microwave extraction method for organic contaminants of anthropogenic origin in river sediments. The extraction method is desi... An Ethos EZ Microwave Lab Station is employed in the development of a robust and efficient microwave extraction method for organic contaminants of anthropogenic origin in river sediments. The extraction method is designed for a small, representative set of target compounds encompassing a range of physicochemical properties. Listed in order of gas chromatography elution they are para-cresol, indole, 4-tert-octylphenol, phenanthrene, triclosan, bisphenol-A, carbamazepine, and benzo [a] pyrene. The sediments samples are extracted wet, which reduces preparation time, and allows the ambient moisture of the sediments to aid in microwave energy absorption and the extraction process. The microwave can hold up to 12 samples that can be simultaneously extracted allowing for rapid sample preparation. Utilizing the pressurized vessels, microwave energy, and a unique mixture of three organic solvents allows for multiple samples to be extracted rapidly with minimal solvent consumption. The final extracts are quantified by gas chromatography/mass spectrometry. Recoveries of the 8 target compounds in sediment range from 49% to 113%, and method detection limits range between 14 and 114 μg kg–1, which are comparable with other more time consuming methods. 展开更多
关键词 Microwave Assisted Extraction Para-Cresol PHENANTHRENE bisphenol-a TRICLOSAN Ben-zo[a]pyrene
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An investigation on a novel PDLC film's fabrication and its electro-optical properties 被引量:2
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作者 DING HongLiu, ZHAO Ting, CHENG YuXiao, PANG YueHong, XU He, SHI GuoYue & JIN LiTong Chemistry Department of East China Normal University, Shanghai 200062, China 《Science China Chemistry》 SCIE EI CAS 2007年第3期358-363,共6页
A polymer dispersed liquid crystal (PDLC) film that has good electro-optical properties is produced by the method of polymerized-induced phase separation. Based on the application foreground, its capability parameters... A polymer dispersed liquid crystal (PDLC) film that has good electro-optical properties is produced by the method of polymerized-induced phase separation. Based on the application foreground, its capability parameters, such as contrast ratio, work voltage, and visual angle, are characterized for the first time by a white light but not a fixed wavelength light. The results show the PDLC film has a low work-voltage of 20 V, more than 150° visual angle, high stability, and long lifetime. The differences between plastic and glass ITO-coated substrates of PDLC films are also studied in this paper. The plastic substrate has better property and will have a wider perspective especially in the portable, tender and folded display devices. Due to adjustable properties of film by electric field, PDLC has the potential application for display device, sensor, switch, grating, and new generation analytical apparatus. 展开更多
关键词 polymer dispersed LIQUID CRYSTAL (PDLC) bisphenol-a epoxy RESIN NEMATIC LIQUID CRYSTAL ELECTRO-OPTICAL properties
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EFFECT OF CHEMICAL STRUCTURE OF POLYCARBONATES ON ENTANGLEMENT SPACING 被引量:1
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作者 李春成 刘琛阳 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2012年第3期343-349,共7页
The master curves of a series of aliphatic polycarbonates (APCs) with different lengths of methylene segments in the repeat unit were obtained by dynamic rheological measurements. The plateau modulus and entanglemen... The master curves of a series of aliphatic polycarbonates (APCs) with different lengths of methylene segments in the repeat unit were obtained by dynamic rheological measurements. The plateau modulus and entanglement molecular weight were determined and cross-checked by different methods. Though having distinct difference in chemical structure of repeat units, both APCs and bisphenol-A polycarbonates have the similar entanglement weight and entanglement spacing. On the other side, the plateau modulus decreases with increasing the length of the side group of aliphatic polycarbonates with different side-chain lengths in the literature. The packing length model can explain the relationship between chain structure and entanglements. 展开更多
关键词 Aliphatic polycarbonates bisphenol-a polycarbonate Plateau modulus ENTANGLEMENT Packing length model.
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Migration of bisphenol A and its related compounds in canned seafood and dietary exposure estimation
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作者 Na Lin Derong Ma +2 位作者 Zhidong Liu Xichang Wang Liyan Ma 《Food Quality and Safety》 SCIE CSCD 2022年第2期275-286,共12页
The present study sought to investigate the migration of target bisphenols,such as bisphenol-A(BPA),bisphenol-F(BPA),bisphenol-A diglycidyI ether(BADGE),bisphenol-A(2,3-dihydroxypropyl)glycidyl ether(BADGE.H_(2)O),bis... The present study sought to investigate the migration of target bisphenols,such as bisphenol-A(BPA),bisphenol-F(BPA),bisphenol-A diglycidyI ether(BADGE),bisphenol-A(2,3-dihydroxypropyl)glycidyl ether(BADGE.H_(2)O),bisphenol-A bis(2,3-dihydroxypropyl)ether(BADGE.2H_(2)O),and bisphenol F diglycidyl ether(BFDGE)in 102 samples of several canned seafood,namely canned Antarctic krill,scallop,oysters,mussel,clam,and mantis shrimp stored for months at different temperatures through a high-performance liquid chromatographic-fluorescence detector com-bined with a microwave-assisted extraction method.Except for BFDGE,the other five bisphenols were observed in most of the analyzed sam-ples.The canned shrimp showed the highest migration of BPA(0.089 mg/kg),exceeding the specific migration limit(SML)of BPA(0.05 mg/kg)specified by the European Union,while the migration levels of BADGE and its derivatives were within their SMLs.The migration behavior of bisphenols in the canned seafood was majorly affected by the analytes,storage conditions,and food types.BPA,BADGE.H_(2)O,and BADGE 2H_(2)O were characterized by a rapid migration during the first half of the shelf life,which increased with the increase of temperature,followed by a stabilization or decline of their concentrations for prolonged durations.Besides,the migration of target bisphenols was significantly influenced by the storage temperature in some seafood species.Notably,higher migration level of BPA was found in samples with higher fat content.The average dietary exposure of Chinese adults to BPA,BPF,BADGE.2H_(2)O,BADGE.H_(2)O,and BADGE of canned seafood was estimated at 11.69,1.21,6.47,8.74,and 4.71 ng/(kg d),respectively.The target hazard quotient values of all the analyzed bisphenols were below 1 for the Chinese adults,suggesting an insignificant exposure to these bisphenols through canned seafood consumption. 展开更多
关键词 bisphenol-a(BPA) BPA-related compounds canned seafood migration behavior dietary exposure
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