SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Yuqi Wang,Yi He,Yi Fan,Hongjie Li,Hao Yu,Jing Yu,Yiling Nie,Shunhui Wang
Developing effective and green methods to treat large volumes of oily sewage is a significant challenge for aquatic pollution. In this study, an environmentally friendly, economical, self-cleaning, and multifunctional sodium alginate (SA)-tannic acid (TA) aerogel for emulsion separation was prepared via simple freeze-drying and in-situ gelation methods. The microstructure and chemical composition of the SA-TA aerogel are characterized by SEM, EDS, FT-IR, and XPS. As a result, the SA-TA aerogel has an interconnected 3D network structure, high porosity and rough microstructure. Furthermore, the SA-TA aerogel behaves a robust super hydrophilicity, underwater superoleophobicity, anti-crude oil-fouling performance and self-cleaning effect. Thus, it has excellent performance to separate oil-in-water emulsion with high water flux only under gravity and shows terrific cyclic stability. It is worth to note that SA-TA aerogels show improved mechanical properties, stable wettability in various chemical environments, and excellent adsorption properties for soluble dyes, which enable them to be used in complex actual water treatment.
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JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 56
·期 2
·1347-1358
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IF 3.553
Shao Huiju,Cheng Jifeng,Kang Dongdong,Qin Shuhao
Abstract Poly(vinylidene fluoride) (PVDF) membrane has been applied in the diverse water treatments, but its inherent hydrophobicity must be adjusted to reduce energy consumption. Herein, high hydrophobicity of PVDF membrane surface was transformed to superhydrophilicity by the combination of mussel-inspired chemistry and biomimetic mineralization. The deposited tannic acid (TA) and polyethylenimine (PEI) induced in situ biomimetic mineralization to form nanosphere and nanowire microstructures on the membrane surface. The highly efficient separation and outstanding antifouling properties were achieved for oil-in-water emulsion and dyeing wastewater treatment. The rejections of nano-ZrO 2 /PEI-TA/PVDF membranes to BSA, oil, Congo red and methyl blue reached as high as 99.3%, 98.8%, 96.8% and 93.5% (15-fold increment compared to that of pristine membrane), respectively. With rejections to BSA (95.0%), oil (93.9%), Congo red (86.6%) and methyl blue (83.2%), the permeate flux of nano-TiO 2 /PEI-TA/PVDF membranes reached as high as 1312.6 L/m 2 h, showing nearly 7.6-fold increment compared with other reported values. This work developed a novel strategy to fabricate multifunctional separation membranes for environmental remediation. Graphic abstract A superhydrophilic membrane with multiple hierarchical structures was fabricated through the combination of mussel-inspired chemistry and biomimetic mineralization to treat dyeing wastewater and oil emulsions highly efficiently.
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ELECTROCHIMICA ACTA
·
2020
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IF 6.215
Qingyuan Zhang,Dawei Gu,Hui Li,Ze Xu,Hongshun Sun,Jishu Li,Lei Wang,Linjiang Shen
In this study, RuO 2 was deposited on tantalum (Ta) substrates by electrochemical plating and then assembled into supercapacitors RuO 2 //RuO 2 . The output energies of the as-obtained RuO 2 //RuO 2 under dynamic conditions were evaluated through a designed measuring circuit. The specific capacitance of electrodes in RuO 2 //RuO 2 was calculated from the experimental results of the discharge current and the potential of positive/negative electrodes during discharge. Also, the energy of the positive/negative electrodes and RuO 2 //RuO 2 with respect to time were derived. The results showed the positive electrode energy was partly transferred into the load R to generate joule heat and the other was used to elevate the potential of the negative electrode during discharge. The decrease in mass of negative electrode ( m − ) could extend the potential window, resulting in an enhancement of the energy of RuO 2 //RuO 2 . The energy of RuO 2 //RuO 2 with m − = 103 μ g was elevated by 138.7% compared to that with m − = 200 μ g . Further decrease in mass of the negative electrode would deteriorate the energy of RuO 2 //RuO 2 .
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Advances in Materials Science and Engineering
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2020
·
IF 1.271
Peiyuan Chen,Yonghui Wang,Shicheng He,Pengju Wang,Ying Xu,Liheng Zhang
This study proposes a green, low-cost, and robust method to synthesize spherical calcium hydroxide (CH) nanoparticles based on the co-precipitation of Ca2+ and OH− in the presence of tannic acid (TA), an inexpensive plant-derived polyphenol. It has been found that the morphology and crystalline phase of the produced CH nanoparticles can be controlled by TA. With the increasing dosage of TA, the crystallinity of the CH particles reduces, changing from well crystallization to amorphous phases. Experimental evidence suggests that complexion reaction took place between TA and Ca2+, which gave the Ca2+ a strong bond effect. As a result, the nucleation and growth of CH were significantly affected. CH nanoparticles with sizes of about 50 nm have been successfully synthesized by using 0.3% or more TA.
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COMPOSITES PART B-ENGINEERING
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2021
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IF 9.078
Jiongjiong Li,Shuaicheng Jiang,Yanqiang Wei,Xiaona Li,Sheldon Q. Shi,Wei Zhang,Jianzhang Li
The fabrication of advanced polymeric films with integrated biodegradability, great toughness, large stretchability, and high strength remains a long-term challenge. In this work, a facile design strategy is proposed for preparing tough, strong, and biodegradable soy protein (SP)-based composite films with excellent UV barrier performance and high thermal stability by integrating amino-containing hyperbranched polysiloxanes (HPS) and dendritic tannin acid (TA). The toughness and tensile strength of the SP/HPS/TA5 film reached up to 17.53 MJ m −3 and 12.87 MPa, which was 564% and 563% increase compared with that of the neat SP-based film, respectively. In addition, such developed film still exhibited a high strain at failure of 169.25%. These remarkable properties were caused by the dynamically fracture and reform of the intermolecular sacrificial hydrogen bonds and the deformation of HPS and TA, as well as the strain-induced extension and alignment of SP chains via interfacial covalent/non-covalent bonds as the anchor points . Moreover, owing to the incorporation of the heat-resistant HPS and the aromatic units-containing TA, the as-fabricated film can block 98.6–100% of the UV-A spectrum and also possessed high thermal stability. This work presents a simple approach for constructing tough, ductility, strong, and biodegradable SP-based composite films for many prospective applications like packaging engineering and UV-blocking biomaterial areas.
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ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Zhirui He,Weizhong Yuan
As a flexible wearable device, hydrogel-based sensors have attracted widespread attention in soft electronics. However, the application of traditional hydrogels at extreme temperatures or for a long-term stability still remain a challenge because of the existence of water. Herein, we reported an antifreezing and antidrying organohydrogel with high transparency (over 85% transmittance), high stretchability (up to 1200%), and robust adhesiveness to various substrates, which consist of polyacrylic acid, gelatin, AlCl3+, and tannic acid in a water/glycerin binary solvent as the dispersion medium. As the binary solvent easily forms strong hydrogen bonds with water molecules, organohydrogels exhibited excellent tolerance for drying and freezing. The organohydrogels maintained conductivity, adhesion, and stable sensitivity after a long-term storage or at subzero temperature (−14 °C). Moreover, the organohydrogel-based wearable sensors with a gauge factor of 2.5 (strain, 0–100%) could detect both large-scale movements and subtle motions. Therefore, the multifunctional organohydrogel-wearable sensors with antifreezing and antidrying properties have promising potential for human–machine interfaces and healthcare monitoring under a broad range of environmental conditions.
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PubMed
高影响因子
DRUG DELIVERY
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2021
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IF 6.419
Ying Liu,Yue Han,Tingting Zhu,Xianglei Wu,Wenxin Yu,Jiafang Zhu,Ying Shang,Xiaoxi Lin,Tianlan Zhao
Hyperpigmentation is a common complaint and distressing problem in dermatology, and tranexamic acid (TA) is an effective treatment agent but limited by the delivery to melanocytes in the epidermis. Herein, a novel TA naogels (named HA/TA-LP), combining the advantages of liposomes and hyaluronic acid (HA), are prepared and assessed for topical hyperpigmentation treatment with targeting delivery and minimizing epidermal diffusion. Morphological characteristics indicate numerous TA-loaded liposomes packed in HA gels. In vitro cell studies using human A375 melanoma cells show that HA/TA-LP can promote the uptake of TA by targeting delivery with resulting inhibition of tyrosinase activity and melanin production. Guinea pigs are used to construct hyperpigmentation models and investigate the topical delivery and treatment efficacy of HA/TA-LP. In vivo topical delivery studies indicate HA/TA-LP realize the effective delivery into melanocytes with an ideal balance of effective permeability and minimizing epidermal diffusion. Subsequently, hyperpigmentation treatment assessments reveal that HA/TA-LP inhibit tyrosinase activity and melanin production under the radiation of UVB. Our study identifies favorable properties of HA/TA-LP for treating hyperpigmentation, and provides an experimental basis for further clinical application.
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高影响因子
Small
·
2021
·Vol. 17
·期 7
·2005865
·
IF 13.281
Peipei Yang,Jia Tao,Fengfeng Chen,Yuying Chen,Jiaqi He,Kui Shen,Peng Zhao,Yingwei Li
Nanozyme-based chemodynamic therapy (CDT) has emerged as an effective cancer treatment because of its low side effects and without the requirement of exogenous energy. The therapeutic effect of CDT highlights the pivotal importance of active sites, H 2 O 2 supplement and the glutathione (GSH) depletion of a nanozyme. The construction of a single kind of catalyst with multiple functions for the enhanced CDT is still a big challenge. In this work, seven types of bimetallic nanoparticles are synthesized using a metal–organic framework (MOF) as a stable host instead of a Fenton or Fenton-like ions supplier. Among them, Cu-Pd@MIL-101 with an alloy loading of 9.5 wt% modified by PEG (9.5% CPMP) is found to exhibit the highest peroxidase (POD) like activity combined with a superoxide dismutase (SOD) mimic activity and the function of GSH depletion. The in vivo results suggest that the stable and ultrafine nanoparticles possess favorable CDT effect for tumor and good biosafety as well as biocompatibility. This work has provided a credible strategy to construct nanozymes with an excellent activity and may pave a new way for the design of enhanced tumor CDT treatment.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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IF 7.963
Lin Shi,Di Zhang,Jinfeng Zhao,Jianliang Xue,Mengnan Yin,Aiping Liang,Bo Pan
The slower adsorption of lower molecular weight organic molecules remains poorly understood. This study investigated the adsorption kinetics of gallic acid (GA) and tannic acid (TA) on kaolinite (Kao), montmorillonite (Mon) and hematite (Hem), with an emphasis on the role of the bound water on the minerals. The lower adsorption of TA and GA on Kao than on Mon attributed to the lower specific surface area of Kao. Because of the electrostatic attraction, the adsorption of TA and GA on Hem was higher than that on Mon, even the specific surface area of the former was much lower than that of the later. The adsorption rates of TA on the three minerals were generally two orders of magnitude higher than those of GA. The adsorption kinetics of GA was strongly diffusion dependent; however, the diffusion process had limited influence on TA adsorption kinetics. The decreased c values of the intraparticle diffusion model of GA with increasing ionic strength provided additional direct evidence for the diffusion-dependent adsorption and the reduced hindrance by bound water via hydration layer compression. However, hydration layer compression had no effect on TA adsorption kinetics. The reduced 1 H NMR relaxation rate of bound water indicated that the bound water quantity on minerals decreased with increasing ionic strength, which proved the occurrence of hydration layer compression. This study highlighted the importance of bound water and the relative sizes of organic molecules in the adsorption kinetics of organic compounds on minerals, which should be carefully considered for their environmental fate studies.
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Polymers
·
2020
·Vol. 12
·期 12
·3008
·
IF 3.426
Menghui Wan,Haodong Zhao,Lichao Peng,Xueyan Zou,Yanbao Zhao,Lei Sun
In this paper, we propose a facile and cost-effective electrospinning technique to fabricate surface-enhanced Raman scattering (SERS) substrates, which is appropriate for multiple analytes detection. First of all, HAuCl4∙3H2O was added into the TEOS/PVP precursor solution, and flexible SiO2nanofibers incorporated with gold nanoparticles (SiO2@Au) were prepared by electrospinning and calcination. Subsequently, the nanofibrous membranes were immersed in the tannic acid and 3-aminopropyltriethoxysilane solution for surface modification through Michael addition reaction. Finally, the composite nanofibers (Ag@T-A@SiO2@Au) were obtained by the in-situ growth of Ag nanoparticles on the surfaces of nanofibers with tannic acid as a reducing agent. Due to the synergistic enhancement of Au and Ag nanoparticles, the flexible and self-supporting composite nanofibrous membranes have excellent SERS properties. Serving as SERS substrates, they are extremely sensitive to the detection of 4-mercaptophenol and 4-mercaptobenzoic acid, with an enhancement factor of 108. Moreover, they could be utilized to detect analytes such as pesticide thiram at a low concentration of 10−8mol/L, and the substrates retain excellent Raman signals stability during the durability test of 60 days. Furthermore, the as-fabricated substrates, as a versatile SERS platform, could be used to detect bacteria ofStaphylococcus aureuswithout a specific and complicated bacteria-aptamer conjugation procedure, and the detection limit is up to 103colony forming units/mL. Meanwhile, the substrates also show an excellent repeatability of SERS response forS. aureusorganelles. Briefly, the prime novelty of this work is the fabrication of Au/Ag bimetallic synergetic enhancement substrates as SERS platform for versatile detection with high sensitivity and stability.Keywords:Ag/Au nanoparticles;synergetic enhancement;electrospun nanofibers;SERS substrates;versatile detection
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MATERIALS LETTERS
·
2020
·
IF 3.204
Shang Xiang,Jingkui Yang,Zhenyu Cui,Shuhao Qin,Qingqing Qin
Polyvinylidene fluoride/polyamide6-grafting-tannic acid (PVDF/PA6-g-TA) hollow fiber membrane was prepared via the reaction between TA and PA6 on the membrane surface by thermally induced phase separation (TIPS) technique. The reaction mechanism and the distribution for TA on outer surface were explored. The change of surface morphology, hydrophilicity, chargeability, anti-fouling capacity and permeability was investigated after grafting. It was found that Schiff base reaction occurred between amino group and phenolic hydroxyl group, and thus avoided the falling of TA. The uniform distribution of TA on outer surface enhanced the hydrophilicity, rejection and anti-fouling capacity. Finally, the improvement of anti-fouling capacity and permeability was analyzed from chargeability for TA and bond water layer on repulsing the stackage of the pollutants. This work provides an efficient way to enhance the anti-fouling performance of membrane via TIPS.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Danni Chen,Daguang Li,Zhenjun Xiao,Zheng Fang,Xuegang Zou,Ping Chen,Tiansheng Chen,Wenying Lv,Haijin Liu,Guoguang Liu
Lead pollution has become a global concern due to its ubiquity and persistence. This study describes two Fe Mn oxide substrate adsorbents, namely, Fe Mn binary oxides (FMBO) and mesoporous Fe Mn binary oxide (MFMBO) covered with tannic acid film (FMBO@TA-Fe 3+ and MFMBO@TA-Fe 3+ ), for the treatment of Pb 2+ in water. The characterization results showed that TA was successfully coated onto the surfaces of FMBO and MFMBO. The maximum capacities of Pb 2+ on FMBO@TA-Fe 3+ and MFMBO@TA-Fe 3+ were 322.08 and 357.14 mg g −1 , respectively, which were twice those of FMBO and MFMBO. The adsorption of Pb 2+ on the adsorbents was a spontaneous, endothermic process with increasing disorder through thermodynamics studies. An overall mechanism was proposed for Pb 2+ adsorption, the improved adsorption performance of FMBO@TA-Fe 3+ and MFMBO@TA-Fe 3+ is ascribed to the mesoporous characteristics and the introduction of hydroxyl groups. Further investigation indicated the adsorption of Pb 2+ could be attributed to electrostatic interactions on FMBO@TA-Fe 3+ and MFMBO@TA-Fe 3+ , and cation exchange existed through the formation of these internal surface complexes. The Pb 2+ -loaded adsorbents could be effectively desorbed in a dilute hydrochloric acid solution, promoting recycling and reuse of the regenerated adsorbents. These results warrant the promising application of FMBO@TA-Fe 3+ and MFMBO@TA-Fe 3+ for the removal of Pb 2+ , and this work first proposed TA film-modified FMBO and MFMBO to improve its adsorption capacity in the application of environmental remediation.
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