FOOD RESEARCH INTERNATIONAL
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2012
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IF 3.15
Weijuan Huang,Huijinlan Xu,Yue Xue,Rong Huang,Hongbing Deng,Siyi Pan
Negatively charged electrospun cellulose acetate (CA) fibrous mats were modified with multilayers of the positively charged lysozyme (LY)–chitosan (CS)–organic rectorite (OREC) composites and the negatively charged sodium alginate (ALG) via layer-by-layer (LBL) self-assembly technique. The morphology and antibacterial activity of the resultant samples were investigated by regulating the number of deposition bilayers, the composition of coating bilayers and the outermost layer. Field emission scanning electron microscopy images indicated that the average diameter of LY–CS–OREC/ALG film coating was larger than that of LY–CS/ALG film coating. X-ray photoelectron spectroscopy results implied that LY and OREC were successfully deposited on CA fibers. The LBL structured fibrous mats with the addition of OREC could enhance the degree of inhibition against Escherichia coli and Staphylococcus aureus . (LY–CS–OREC/ALG) 10.5 film coating with the best antibacterial activity, selected for preserving pork for 21 days, could extend the shelf-life of pork for about 3 days.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 26
·期 28
·28860-28870
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IF 2.914
Sun Zhiming,Yuan Fang,Zhang Xinchao,Zhu Rui,Shen Xinyi,Sun Bingyan,Wang Bin
Nowadays, most of mineral-based adsorbents are powder form, which makes them inconvenient to collect and always easy to cause secondary pollution. In this work, an organic rectorite composite nanofiber membrane (SRt-PAN) was designed and prepared by electrospinning technique. The as-received composite nanofiber membranes were characterized by XRD and SEM analysis, proving the homodisperse and existence of SRt in PAN nanofiber membrane. A series of batch experiments for BPA adsorption were carried out to investigate the effect of different adsorption parameters, including initial concentration, pH, and temperature of pollutant solution. The influences of modifier dosage and adsorbent dosage on the adsorption performance were investigated as well. On the basis of the experiment results, the adsorption process could be well described by the pseudo-second-order model and the Langmuir isotherm. In addition, the thermodynamic parameters indicate that this adsorption process is exothermic and spontaneous. Moreover, compared with pure nanofiber membranes and organic rectorite powders, the resultant SRt-PAN adsorbents exhibited higher adsorption capacity, superior reusability, and adsorption stability. It is indicated that the hydrophobicity surface of organic rectorite should be the key factor to not only the intimate interfacial combination between the mineral and PAN, but also the enhancement of BPA adsorption capacity.
研究领域:
材料科学
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环境工程
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化学工程
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Longlong Zhu,Pei-jiang Zhou,Chaoqi Chen
In recent years, modification of graphite carbon nitride (g-C 3 N 4 ) has drawn considerable attention because of its catalytic potential. In this study, rectorite was designed as a carrier for g-C 3 N 4 , and g-C 3 N 4 /rectorite was synthesized via pyrolysis under nitrogen protection. The efficiency of g-C 3 N 4 /rectorite for peroxymonosulfate (PMS) activation was evaluated using acid Orange 7 dye (AO7) as a model organic contaminant . Material characterization suggested the successful synthesis of g-C 3 N 4 /rectorite. The removal of AO7 was significantly enhanced by the composite, compared to pure g-C 3 N 4 , rectorite, or their physical mixture. The g-C 3 N 4 content in the composite affected its catalytic ability, while the g-C 3 N 4 /rectorite with 41% g-C 3 N 4 content showed the highest catalytic efficiency. Furthermore, the removal of AO7 was affected by catalyst concentration, oxidant concentration, and solution pH. Notably, under the optimized condition (i.e., 0.8 g/L of g-C 3 N 4 /rectorite, 0.20 mg/L of PMS , and 6.0 of pH), an initial concentration of 50 mg/L AO7 was removed to a level below the detection limit (i.e., 0.25 mg/L) within 8 min. A recycling test demonstrated the reusability of the g-C 3 N 4 /rectorite in six repeated reactions. Singlet oxygen played a key role in PMS activation, suggesting that the non-radical degraded process is the dominated AO7 removal pathway. The rectorite has a confined effect preventing g-C 3 N 4 from agglomeration, inhibiting the electron-hole recombination, and improve the exposure of active sites such as C O groups, -OH groups, and pyridinic N. Overall, g-C 3 N 4 /rectorite is a low-cost and environment-friendly catalyst exhibiting high catalytic activity for PMS activation to remove organic contaminants in water.
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APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Qihang Zhao,Weiwei Yin,Chenhui Long,Zhiyi Jiang,Jinlong Jiang,Huaming Yang
The abuse of tetracycline has caused serious water pollution , so it is very important to explore the advanced removal technology of tetracycline from wastewater. Herein，a simple thermal treatment method leads to the modification of the surface and structure of rectorite to achieve the activation of rectorite (Rec 600 ) and successfully constructs multiple adsorption sites. The experimental results showed that Rec 600 exhibited good adsorption performance for tetracycline (143.25 mg·g −1 ), and the pseudo-second-order model and Freundlich model could better describe the kinetic and adsorption data. Rec 600 has a good adsorption ability in a wide pH range, and the removal rate of tetracycline decreased only 38.5% after 5 adsorption cycles. Rec 600 deploys good adsorption capacity , which can be attributed to the synergy of hydrogen bonding, electrostatic attraction and cation exchange. Rec 600 has the characteristics of high adsorption capacity , good reusability , low price and easy preparation, and has broad application prospects in the removal of tetracycline in polluted water.
研究领域:
环境科学
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水处理技术
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材料科学
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高影响因子
MATERIALS RESEARCH BULLETIN
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2014
·
IF 1.968
Yunfang Chen,Jianzhang Fang,Shaoyou Lu,Yan Wu,Dazhi Chen,Liyan Huang,Weicheng Xu,Ximiao Zhu,Zhanqiang Fang
In this work, a new plasmonic photocatalyst Ag/AgI/BiOI-rectorite was prepared via a cation exchange process. The photocatalyst had been characterized by X-ray powder diffraction (XRD), Raman spectra, nitrogen sorption (BET), field-emission scanning electron microscope (FE-SEM), X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectroscopy (DRS). The photocatalytic activity, which was evaluated by degradation of rhodamine B (RhB) and bisphenol A (BPA) under visible light irradiation, was enhanced significantly by loading Ag/AgI/BiOI nanoparticles onto rectorite . The photogenerated holes and superoxide radical ( O 2 − ) were both formed as active species for the photocatalytic reactions under visible light irradiation. The existence of metallic Ag particles, which possess the surface plasmon resonance effect, acted as an indispensable role in the photocatalytic reaction.
研究领域:
材料科学
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环境科学
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2016
·
IF 3.902
Yang Wu,Xueyong Li,Xiaowen Shi,Yingfei Zhan,Hu Tu,Yumin Du,Hongbing Deng,Linbin Jiang
When an efficient automated coating machine is used to process layer-by-layer (LBL) deposited nanofibrous mats, it causes an obvious planar effect on the surface of the mats, which can be eliminated through ultimate immersion. During this process, chitosan (CS) − rectorite (REC) intercalated composite films are built on the surface of cellulose acetate (CA) nanofibrous mats by a coating machine. Then, the immersion process is utilized to allow positively charged CS or CS-REC intercalated composites to uniformly assemble on the surface of negatively charged CA nanofibers. An investigation into the morphology of the resultant scaffolds confirms that the uniquely small pore size, high specific surface area and typically three-dimensional (3D) structure of nanofibrous mats remain present. The results of Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) indicate that it is feasible to assemble nanofibrous mats using a coating machine. The intercalated structure of CS-REC is confirmed by the results of small-angle X-ray diffraction (SAXRD) and wide-angle X-ray diffraction (WAXRD). The results of the cell experiment and antibacterial test demonstrate that the addition of REC not only has little impact on the cytocompatibility of the mats but also enhances their ability to inhibit bacteria.
研究领域:
材料科学
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生物医学工程
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PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Linbin Jiang,Yuan Lu,Xingyun Liu,Hu Tu,Jianwei Zhang,Xiaowen Shi,Hongbing Deng,Yumin Du
Quaternized carboxymethyl chitosan (QCM-chitosan) and organic rectorite (OREC) immobilized nanofibrous mats are fabricated via layer-by-layer (LBL) technique in a self-assembly manner. The negatively charged cellulose nanofibrous mats hydrolyzed from electrospun cellulose acetate (CEL) mats are alternately modified with the positively charged QCM-chitosan and OREC intercalated composites and the negatively charged sodium alginate (ALG) via LBL technique. The morphology and antibacterial activity of the resultant mats are studied by changing the number of deposition bilayers, the compositions of dipping solutions and outermost layer. X-ray photoelectron spectroscopy results imply that QCM-chitosan and OREC are coated on cellulose mats. Besides, wide angle X-ray diffraction and small angle X-ray diffraction are applied to investigate the crystalline of the composite mats and the interlayer distance of OREC, respectively. The antibacterial activity of the mats increases with the incorporation of OREC into LBL films.
研究领域:
材料科学
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纳米技术
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高分子科学
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表面工程
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生物医学工程
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抗菌技术
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高影响因子
ADVANCED MATERIALS
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2022
·Vol. 34
·期 43
·2206855
·
IF 32.086
Xiao-Feng Pan,Guan-Hua Yu,Huai-Ling Gao,Zhe-Zhao Wang,Zhiwei Bao,Xiaoguang Li,Shu-Hong Yu
Compared with raw rectorite microplatelets (RMs), rectorite nanosheets (RNs) have considerably greater application prospects in the preparation of advanced composite materials because of their larger aspect ratio, higher surface reactivity, and intrinsically superior mechanical and physical properties. However, the difficulty in the efficient preparation of RNs significantly limits their large-scale applications. Here, a scalable poly(vinylpyrrolidone)-assisted stirring approach is developed to prepare ultrathin RNs from the abundant natural RMs. A higher production rate (≈0.675 g h −1 ) is achieved compared with that of most other nanosheets. Additionally, instead of using conventional time- and energy-consuming high-speed centrifugation, an efficient poly(dienedimethylammonium chloride)-assisted sedimentation strategy is proposed here to rapidly separate the exfoliated RNs from the RN dispersion. Then, the RNs are co-assembled with aramid nanofibers (ANFs) into large-scale nacre-mimetic ANF-RN nanopapers with considerably enhanced mechanical, electrical insulating, and high-temperature-resistant properties compared with pure ANF nanopapers and ANF-RM micropapers. Moreover, these properties are superior to those of previously reported ANF-based nanopapers and commercial insulating micropapers.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2015
·
IF 4.529
Yunfang Chen,Jianzhang Fang,Shaoyou Lu,Yan Wu,Dazhi Chen,Liyan Huang,Cong Cheng,Lu Ren,Ximiao Zhu,Zhanqiang Fang
This study aims at photocatalytic degradation of 2,4-DCP with the assistance of H 2 O 2 in aqueous solution by a composite catalyst of Ag-rectorite. The catalysts were prepared via a novel thermal decomposition method followed after the cation-exchange process. The synthesized nano-materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET) surface analyzer, Ultraviolet–visible light (UV–vis) absorption spectra, field-emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM). The different mechanisms of degradation process with or without visible light irradiation were discussed, respectively. Moreover, the degradation efficiency of 2,4-DCP wastewater under Ag-rectorite/H 2 O 2 /visible light system was investigated by series of experiments, concerning on effects of major operation factors, such as H 2 O 2 dosage and the initial pH value. The highest degradation rate was observed when adding 0.18 mL H 2 O 2 into 50 mL 2,4-DCP solution, and the optimal pH value was 4 for the reaction. Afterwards, total organic carbon (TOC) experiments were carried out to evaluate the mineralization ratio of 2,4-DCP.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2016
·
IF 2.586
Zhujian Huang,Pingxiao Wu,Beini Gong,Xing Zhang,Zicong Liao,Pen-Chi Chiang,Xinjiang Hu,Lihua Cui
To further enhance the photocatalytic properties of doped-TiO 2 , a series of (N, Cu) co-doped TiO 2 /rectorite composites with different amount of N doping were prepared for adsorption and catalytic oxidation of p -chlorophenol ( p -CP) under visible light. The physicochemical properties of the obtained composites were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), etc. The results showed that the (N, Cu) co-doped TiO 2 catalyst was immobilized well onto rectorite , and the doping of N and Cu could affect the crystal structure of TiO 2 . The optimal N doping amount was determined by the photocatalytic degradation of p -CP in a stirred quartz reactor under visible light (> 420 nm) irradiation. It was found that the doping of N can improve significantly the degradation of p -CP and the optimum N doping amount is 1.0%. The adsorption of p -CP by the composites could accelerate the degradation rate of p -CP in situ. The photocatalytic activity of the (N, Cu) co-doped TiO 2 /rectorite composites remained stable after five cycles of photoreaction. A possible mechanism for the photocatalytic degradation of p -CP is proposed. Our work implied that rectorite has great potential to be applied in the field of photocatalysis .
研究领域:
环境科学
·
材料科学
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高影响因子
危险品化学品经营许可证（带存储）