JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Sikuai Xue,Chengcai Li,Jiuming Li,Hailin Zhu,Yuhai Guo
To improve hydrophilicity and anti-fouling property of the polytetrafluoroethylene (PTFE) flat microfiltration (MF) membrane, a facile method was developed to modify the membrane via the co-deposition of catechol (CA) and polyethyleneimine (PEI) followed by surface mineralization of γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH560). The surface chemical composition, surface morphology, hydrophilicity and filtration performance of the PTFE flat membrane were investigated by ATR-FTIR, XPS, FESEM, WCA and pure water flux measurements, respectively. After using this low-cost and simple modification method, the PTFE flat membrane was endowed with excellent hydrophilicity, high water permeation flux and superior anti-fouling property. Then, the oil/water separation tests were conducted using the modified PTFE flat membranes. The size distribution of the oil droplets is between 0.12–1.44 µm and the mean pore size of pristine PTFE flat MF membrane is 0.22 µm. The as-prepared hydrophilized PTFE flat membranes possess an excellent oil resistant ability with oil rejection ratio near 99%. Finally, the surface stability of the modified membrane was studied and the mineralized membrane showed excellent acid resistant ability. Therefore, this facile strategy holds attractive potential practical application in water environmental remediation.
研究领域:
材料科学
·
环境工程
·
膜技术
·
表面化学
·
水处理
✓ 已验证
DOI
高影响因子
ACS Applied Engineering Materials
·
2024
·
IF 0
Jiao Yang Lu,Zhen Qi Bu,Donghua Wang,Binsheng He,Wei Tao Huang
Nanocomposites have gained significant attention for various applications, such as sensing, catalysis, and energy. While graphene–silver and other similar combinations have been extensively explored, the synthesis of nanocomposites based on antimony and noble metals (such as silver and gold) remains unexplored. In this study, we introduced an approach for preparing silver nanoparticle (AgNP)-decorated antimony trioxide nanocomposites (Sb2O3–Ag) with exceptional catalytic properties. These nanocomposites, synthesized rapidly using antimonene (AM) and Ag+ precursors under microwave-assisted heating, exhibited promising catalytic performance. Characterization techniques, including transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR), confirmed the formation of Sb2O3–Ag nanocomposites, showcasing AgNPs dispersed on the surface of large irregular Sb2O3 particles. Evaluation of catalytic activity using p-nitrophenol (PNP) degradation revealed a rapid elimination rate of approximately 91.6% within 2 s. Several experimental parameters, such as the ratios of AM and Ag+ concentrations and the catalyst amount, were optimized to establish the best reaction conditions for PNP degradation. Furthermore, the sustained catalytic activity of Sb2O3–Ag nanocomposites over 1 month underscores their potential for long-term applications. Analysis through electron paramagnetic resonance spectroscopy suggests the generation of hydroxyl radicals responsible for PNP decomposition, supported by a proposed degradation pathway using electrospray ionization mass spectrometry. This study not only introduces a bimetallic nanomaterial based on Sb and Ag but also provides a sustainable solution for organic pollutant degradation.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
Advanced Membranes
·
2024
·
IF 0
Jiale Du,Zijian Yu,Jiangjing Li,Shuangling Xie,Lianxin Chen,Jiuyang Lin
Conventional treatment methods of landfill leachate concentrate mainly focus on the degradation or removal of humic substance, which are prone to secondary pollution and fail to meet the requirements of current sustainable development. The key to sustainable management of landfill leachate concentrate is to precisely fractionate the existing humic substance and inorganic salts as individual resources. Here, electro-driven nanofiltration membranes were fabricated by sodium periodate inducing co-deposition of pyrogallol and polyethyleneimine on the loose polyamide-based nanofiltration substrate membranes as high-performance anion conducting membrane. The pyrogallol/polyethyleneimine composite coating layer endowed the electro-driven nanofiltration membranes with reduced surface negative charge and specific areal electric resistance for enhanced anion transfer. During the electro-driven nanofiltration process, the fabricated membrane with a 30-min co-deposition exhibited an extremely fast anion transfer rate and outstanding fractionation performance with 99.08 % humic substance recovery of 99.08 %. Particularly, the fabricated membrane showed stable separation capacity over an 8-cycle electro-driven nanofiltration operation, demonstrating a low fouling propensity. Our study sheds light on the strategy to fabricate high-performance electro-driven nanofiltration membranes via co-deposition of pyrogallol and polyethyleneimine, paving the way to sustainable treatment of landfill leachate concentrate.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Jinxin Fan,Jianquan Luo,Yinhua Wan
Biocatalytic membranes are promising to remove micro-pollutants in aqueous environment due to their mild and green operation condition. However, more efforts need to be devoted to improving their removal efficiency and stability. In this study, metal chelating affinity membrane chromatography (MCAMC) was used to construct a biocatalytic membrane by selectively capturing laccase from a crude fermentation broth. Metal ions had a significant effect on the activity of the immobilized laccase and copper ion was the best choice. A pH of 4.5 was selected for laccase adsorption and its loading seemed the same under flow rates from 0.5 to 10 mL min −1 thanks to the inherent convective transport of membrane chromatography. The pH value and salt concentration in the storage buffer had an obvious effect on the stability of the immobilized laccase, and the prepared biocatalytic membrane retained 87% of initial activity after 20 days storage. When applying such membrane to micro-pollutant removal (taking bisphenol A (BPA) as an example), a high BPA removal efficiency (99.3%) could be obtained. The biocatalytic membranes could be operated at a high flux of 50 L m −2 h −1 without recycling the permeate into the feed, and its throughput and BPA removal rate were superior to the most results in the literature. However, BPA removal decline (from 99.6% to 56.6% after five cycles) occurred during the successive water treatment due to the membrane fouling caused by BPA polymerization products. Membrane regeneration could be achieved by simple elution-cleaning-reloading, and the laccase activity and BPA removal were fully recovered.
研究领域:
环境生物学
·
生物工程
✓ 已验证
DOI
高影响因子
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
·
2021
·
IF 3.963
Jie Li,Su Fu,Gang Fan,Dongmei Li,Shuzhen Yang,Litao Peng,Siyi Pan
The antifungal activity of postharvest kiwifruit against the pathogen Botryosphaeria dothidea was evaluated for 33 essential oil monomers . The possible mechanism for the known active compounds were further assessed in this study. The results show all the EO components exhibit inhibitory effects on the pathogen to different degrees except for Farnesol . Carbon chain length and C 2 -C 3 double bonds had a great effect on the antifungal activities of aldehydes. Of all of these, carvacrol had the strongest antifungal activity with EC 50 of 12.58 μL/L and EC 90 of 22.08 μL/L. Carvacrol also exhibits significant inhibitory effects on the pathogen, both in vivo and in vitro . Carvacrol evidently alters the hyphal morphology of B. dothidea and severely damages cell membrane and inhibits the formation of lipid components on the membrane. As cell membrane permeability increases, intracellular homeostasis including ion and biomacromolecules were destroyed by carvacrol. Furthermore, carvacrol appears to significantly inhibit mitochondrial activity and respiration rates, resulting in cell death of B. dothidea . Our results provide evidence that carvacrol could be a very useful compound for controlling postharvest rot soft in kiwifruit .
研究领域:
植物病理学
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食品科学
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分子生物学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Zhongshan Liu,Hongwei Wang,Junjie Ou,Lianfang Chen,Mingliang Ye
Subject to synthetic conditions, covalent organic frameworks (COFs) are usually in powder form. Herein, taking an azine-linked COF as an example, detailed characterizations indicated that accessible aldehyde groups and hydrazine groups ( C N NH 2 , 88 μmol g −1 ) concurrently existed on its surface. Intrigued by such feature, we have developed an approach based on ring-opening polymerization to shape COF powder into monoliths. The crystallinity and micropore of COF in monoliths were well remained, meanwhile, the ring-opening polymerization remarkably generated macropores ranging from 0.43 to 3.51 μm, indicating a hierarchically porous structure. The BET surface area of resultant monoliths with different COF mass fractions of 16%, 28% and 43% ranged from 105 to 281 m 2 g −1 . Due to the π–π interaction and hydrogen bond interaction, COF-based monoliths exhibited strong retention and rapid adsorption for bisphenol A (BPA) in aqueous medium. When 29 mL BPA solution (22.8 mg L −1 ) passed through COF-based monolith (28%), the adsorption capacity was up to 61.3 mg g −1 . Furthermore, the COF-based monolith demonstrated excellent cycle use for catalyzing Suzuki-Miyaura coupling reaction after being coordinated with palladium acetate.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 33
·80817-80827
·
IF 5.8
Huang Guofu,Wang Mianmian,Sun Xinying,Liu Haijian,Liu Fangfang
In this work, pomegranate peel extracts were used as the green reducing agent to synthesize Cu/Fe nanoparticles (P-Cu/Fe nanoparticles) and removed tetrabromobisphenol A (TBBPA) in aqueous solution. P-Cu/Fe nanoparticles were amorphous and irregularly spherical. The surfaces of nanoparticles contained Fe 0 , Fe 3+ oxides (hydroxides), and Cu 0 . The bioactive molecules from pomegranate peel were extremely important for the synthesis of nanoparticles. P-Cu/Fe nanoparticles had excellent removal performance for TBBPA, and 98.6% of TBBPA (5 mg L −1 ) was removed within 60 min. The removal reaction of TBBPA by P-Cu/Fe nanoparticles was well-fitted with the pseudo-first-order kinetic model. The Cu loading was critical for TBBPA removal with an optimum value of 1.0 wt%. A weakly acidic condition (pH 5) was more favorable for the removal of TBBPA. The removal efficiency of TBBPA increased with the rise of temperature and decreased with increasing initial TBBPA concentration. The activation energy ( E a ) was 54.09 kJ mol −1 , indicating that the removal of TBBPA by P-Cu/Fe nanoparticles was mainly surface-controlled. Reductive degradation was the main mechanism of TBBPA removal by P-Cu/Fe nanoparticles. In conclusion, green synthesized P-Cu/Fe nanoparticles using pomegranate peel waste show great potential for the remediation of TBBPA in aqueous solution.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Sustainable Chemistry and Pharmacy
·
2024
·
IF 5.5
Sidali Zaidi,Nassima Chaher-Bazizi,Taous Kaddour,Zineb Medjahed,Nadjet Benaida-Debbache
In recent years, significant advancements in the field of green chemistry have spurred the search for alternative solvents for the extraction of phenolic compounds. In this perspective, the objective of this study is to investigate the potential of lactic acid as an alternative solvent for extracting phenolic compounds from Pistacia lentiscus L. Utilizing ultrasound-assisted extraction methodology and response surface methodology, the aim is to optimize the extraction process. Additionally, the study encompasses phytochemical screening, evaluation of biological activity, and characterization of bioactive molecules using liquid and gas chromatography coupled with mass spectrometry. Optimization using the BBD revealed a TPC of approximately 130.17 mg Gallic acid equivalent/g dry weight, achieved at 63.5% lactic acid for 29.67 min at 44.44 °C. Furthermore, in vitro antioxidant tests showed that P.lentiscus extract exhibited potent antioxidant activity with high potential of 186.39 and 176.72 mmol trolox equivalent/100 g dry weight for DPPH• and ABTS•+, respectively. Moreover, P.lentiscus extract demonstrated strong anti-inflammatory activity, with IC 50 values of 0.027%, 0.15%, and 0.034% for NO•, COX and MPO inhibition, respectively. Phytochemical characterization also revealed the presence of organic acids and phenolic compounds, identified as novel molecules characterized for the first time in P.lentiscus leaves. These findings underscore the effectiveness of using lactic acid-based alternative extraction solvents for phenolic compounds, particularly in industrial and pharmaceutical applications.
研究领域:
植物化学
·
药理学
·
分析化学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 33
·期 2
·492-504
·
IF 3.665
Zhongyang Yao,Qiming Cao,Chenyang Li,Weiguang Gong,Xin Meng
In this article, a β-cyclodextrin(CD)/cardanol (CA) inclusion complex (IC) was fabricated by co-precipitation method, which was used to guarantee excellent thermal oxidative stability and environmental-response antioxidation releasing property of PLA. The results showed that CA was successfully immobilized into β-CD with a stoichiometric ratio of 1:1, and the immobilization inhibited the migrant of CA from PLA during storage, resulting in the enhancement of antioxidant life of CA in PLA. Thus, PLA stabilized by IC (PLA/IC) maintained higher oxidation onset temperature (OOT) and molecular weight after long-term thermal oxidative aging. Moreover, CA releasing comparison from PLA/IC and PLA stabilized by CA (PLA/CA) in food stimulant suggested that PLA/IC released CA faster than PLA/CA when PLA contacted with food stimulants due to the solubilization of β-CD for CA, which would induce the quicker antioxidation of CA in food. In a word, IC can make PLA with longer anti-oxidative stability during storage and quicker environmental-response antioxidation releasing property during usage, showing strong potential as an active food-packaging materials.
研究领域:
材料科学
·
食品包装工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Mantang Chen,Zhimin Zhang,Lihua Zhu,Nan Wang,Heqing Tang
The present work aimed at using bisulfites (HSO 3 − ) to enhance the oxidative degradation of bisphenol A (BPA) in a Fenton process based on the Fe 3+ -H 2 O 2 reagents. It was confirmed that both the degradation and mineralization of BPA were drastically enhanced by the addition of HSO 3 − . Typically, the use of 0.1 mmol L −1 Fe 3+ , 0.3 mmol L −1 HSO 3 − and 10 mmol L −1 H 2 O 2 achieved a complete degradation of BPA (0.05 mmol L −1 ) in only 2 min. The addition of HSO 3 − increased the BPA degradation rate constant from 0.045 min −1 in the Fe 3+ -H 2 O 2 system to 2.71 min −1 in the Fe 3+ -HSO 3 − -H 2 O 2 system by 60 times. This drastic enhancement effect of HSO 3 − was attributed to its complexing and reducing abilities. The formation of FeSO 3 + complex prevented the precipitation of Fe 3+ and accelerated the cycling of Fe 3+ /Fe 2+ ; the reducing ability of HSO 3 − further favored the transformation of Fe 3+ to Fe 2+ . Several reactive species, including OH, SO 3 − and SO 4 − were responsible for the degradation of BPA, among which OH was the dominant one. The proposed Fe 3+ -HSO 3 − -H 2 O 2 system is suggested be able to act as the followed stage of a traditional Fe 2+ -H 2 O 2 system in the engineering setting.
研究领域:
环境科学
·
化学工程
·
污染控制
✓ 已验证
产品关联
DOI
高影响因子
POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2018
·
IF 3.112
Yurong Ma,Qingfeng Ban,Jingying Shi,Tiantian Dong,Cai-Zhong Jiang,Qingguo Wang
The effects of 1-methylcyclopropene (1-MCP) treatment, storage time, and shelf life and temperature on phenolic concentrations and antioxidant activity in apple peel and flesh of ‘Jonagold’ apple ( Malus domestica Borkh) have been investigated. Hyperoside and chlorogenic acid were the most abundant phenolic compounds in the peel and flesh, respectively. The flesh had lower concentrations of individual phenolics, total phenolics, flavonoids and lower antioxidant activity (determined by 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay) than the peel. In addition, the profiles of phenolics as well as the changing patterns of individual phenolics also differed between the peel and the flesh. After long-time storage (180 d), the greatest decrease of concentrations was the concentrations of hyperoside (27 %) in the peel and total phenolics (35 %) in the flesh. Also, during the 90–180 d storage period, hyperoside and rutin in the peel, chlorogenic acid in the flesh, and flavonoids and antioxidant activity decreased in both peel and flesh tissues. Individual phenolics exhibited different stabilities during the early stages after harvest. 1-MCP reduced the reduction in the concentrations of hyperoside in the peel, chlorogenic acid in the flesh, and total phenolics, flavonoids and antioxidant activity in both the peel and flesh tissues during storage and shelf life. However, for quercetin and rutin, the protective effect of 1-MCP was only observed during the shelf life period. Overall, phenolic compounds responded variously to storage, shelf life, shelf temperature and 1-MCP treatment.
研究领域:
食品科学
·
植物生理学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jing Tang,Xiaoqing Ma,Jing Liu,Shengbiao Zheng,Jianfei Wang
In this study, an electrochemical sensor for the simultaneous detection of hydroquinone (HQ) and catechol (CC) was fabricated on glassy carbon electrode (GCE) modified with graphene quantum dots (GQDs). The prepared GQDs were characterized by transmission electron microscope and fourier transform infrared spectroscopy. The GQDs/GCE, which prepared by electrodeposition method, and characterized by electrochemical impedance spectra, exhibited excellent electrochemical catalysis and conductive properties for HQ and CC. Owing to the high electroactive surface area, good electrocatalytic activity and low charge transfer resistance of GQDs, HQ and CC can be easily measured simultaneously for the large separation of oxidation peak potentials (113 mV) and do not interfere with each other. Under the optimal experimental condition, the oxidation peak currents were linear to HQ/CC in the range from 0.5 μM to 100 μM with the same low detection limits of 0.08 μM (S/N=3). Simultaneous determination of HQ and CC with such electrode was conducted in river water samples with reliable recovery between 97.90% and 103.9%.
研究领域:
分析化学
·
电化学
·
环境监测
·
传感技术
·
水污染检测
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）