DESALINATION
·
2022
·
IF 11.211
Long-Fei Ren,Siqi Zhang,Zhongbao Ma,Yangbo Qiu,Diwen Ying,Jinping Jia,Jiahui Shao,Yiliang He
Excessive discharge of saline antibiotics wastewater into aquatic ecosystem is one crucial environmental issue facing the world today. Herein, an eco-friendly nanofiltration (NF) membrane was fabricated based on coordination complexes of tannic acid and ferric ions (TA-Fe) to selectively separate antibiotic and monovalent salt. Optimal membrane with Fe/TA molar ratio of 3/1 and coordination time of 60 s exhibited Zeta potential of −26.0 mV (pH = 7), water contact angle of 45.5 o and pore radius of 0.36 nm. Consequently, TA-Fe@M3-T60 membrane showed high ciprofloxacin/NaCl rejection ratio of ~5.9 and considerable water permeability of 20.6 ± 1.2 LMH. Besides, relatively high rejection rates were obtained for ofloxacin (94.1 ± 2.2 %) and ciprofloxacin (91.9 ± 2.5 %), while rejection rate for trimethoprim was much lower (68.2 ± 4.1 %). Effects of static/dynamic membrane adsorption of antibiotics on subsequent removal performance were investigated for the first time. Rejection rate improvements of 7.4–15.2 % were observed on pristine membrane compared with pre-adsorbed membrane in short-term NF process. Electrostatic shielding experiment and rejection rate prediction further distinguished the contributions of steric hindrance , electrostatic interaction and membrane adsorption on antibiotics removal, especially antibiotics in zwitterionic form at pH = 7. The findings of this work imply that this newly developed NF membrane has great potential for efficient treatment of antibiotics-contaminated wastewater.
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高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Jie Liu,Yitong Dong,Zhengxin Ma,Zhilu Rao,Xuejing Zheng,Keyong Tang
This study aimed to develop nanocomposite films based on a soluble soybean polysaccharide (SSPS), carrageenan (CG), and green synthesized silver nanoparticles (AgNPs) by a solution casting technique. AgNPs were obtained by reducing a silver–ammonia complex using a SSPS as both a stabilizing and reducing agent, which was confirmed by UV–vis spectroscopy, X-ray diffraction (XRD), transmission electron microscopy, and X-ray photoelectron spectroscopy. CG was introduced into the SSPS/AgNP matrix as a reinforcing component to strengthen the nanocomposite films. The results indicate that the addition of CG led to significantly enhanced mechanical properties, thermal stability, and water resistance of the films. The XRD and Fourier transform infrared spectroscopy results reveal strong interactions between AgNPs and polysaccharide chains. Compared with the SSPS/CG films without AgNPs, the SSPS/CG/AgNP nanocomposite films exhibited antibacterial activity against Escherichia coli and Staphylococcus aureus. The results suggest that the SSPS/CG/AgNP antibacterial nanocomposite films have great potential in food and pharmaceutical packaging applications.
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高影响因子
GREEN CHEMISTRY
·
2022
·Vol. 24
·期 21
·8292-8301
·
IF 11.034
Cong Luo,Jiayi Wang,Houfang Lu,Kejing Wu,Yingying Liu,Yingming Zhu,Binshen Wang,Bin Liang
An ideal strategy for the management of greenhouse gas carbon dioxide (CO2) and surplus industrial product-glycerol (Gly) is to convert them into the valuable glycerol carbonate (GC). However, conventional conversion processes rely on high CO2 pressure and reaction temperature. In this work, a series of easily prepared protic ionic liquids (ILs) were studied for the one-pot synthesis of GC using CO2, Gly, and styrene oxide (SO). A 94% yield of GC was obtained with the catalysis of 1,8-diazabicyclo[5.4.0]undec-7-enenium iodide (HDBUI) under atmospheric pressure at 45 °C. Experimental results and density functional theory (DFT) calculations suggest that the high catalytic activity of HDBUI is attributed to the strong nucleophilicity and substrate activation afforded by the synergistic effect of the protic HDBU+ cation and I− anion. In addition, high GC yields were also obtained when simulated flue gas and crude Gly were used as substrates.
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DESALINATION
·
2022
·
IF 11.211
Zhongbao Ma,Long-Fei Ren,Diwen Ying,Jinping Jia,Jiahui Shao
Thin-film composite polyamide (TFC-PA) nanofiltration membrane is promising in heavy metal removal due to its excellent performance and high economic benefits. However, the common interfacial polymerization (IP) fabrication method requires abundant toxic and harmful solvents, causing harm to the environment and humans. Therefore, novel green, low-carbon and sustainable fabrication methods are urgently needed. Here, we reported a sustainable electrospray polymerization (SEP) technique for TFC-PA membrane preparation via electrospray featuring no toxic solvent, near-complete monomer conversion , and zero waste liquid discharge. In this process, 2-methyl-tetrahydrofuran and ethanol were used as green solvents, and its greenness was assessed by green metrics and toxicity bioassays. Physical features and physicochemical properties of SEP membranes were characterized by SEM, TEM, AFM and XPS. Membranes with different surface charges and pore sizes could be tailored by varying the monomer concentration . The optimal membrane exhibited excellent removal efficiency of toxic heavy metal ions , in which the rejection rates of Cu 2+ and Ni 2+ were higher than 97.0 %. In addition, the permeability and salt rejection of SEP membranes were better than those of IP membranes. Our sustainable electrospray polymerization method provides a versatile green platform for fabricating TFC membranes and may facilitate the development of sustainable nanofiltration membranes.
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高影响因子
CARBOHYDRATE RESEARCH
·
2022
·
IF 2.975
Ni Zeng,Lihua He,Linrui Jiang,Shaoyun Shan,Hongying Su
Hydrogels loaded with magnetic nanoparticles have been widely researched recently as biomaterials, due to their good biocompatibility and unique magnetic characteristics. In this study, water-soluble superparamagnetic iron oxide nanoparticles (Fe 3 O 4 ) prepared by coprecipitation were physically doped into the dextran hydrogels which were formed via Schiff base reactions between ethylenediamine and oxidized dextran. The combination of magnetic nanoparticles and chemical cross-linked hydrogels leads to magnetic/pH dual-sensitive hydrogels which can be used as stimuli-responsive carrier. Magnetic properties, swelling, and rheology behaviors of the resulted magnetic hydrogels were strongly affected by the Fe 3 O 4 nanoparticle content. Moreover, doxorubicin (DOX⋅HCl) was embedded into the magnetic hydrogels and pH/magnetic sensitive release profiles were identified. The release mechanism analysis indicated that the release behaviors of DOX⋅HCl were controlled by the diffusion, swelling, and erosion processes simultaneously. The prepared hydrogel/Fe 3 O 4 composites with dual magnetic/pH stimuli-responsiveness hold the promise to be used in various applications such as drug release.
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PubMed
高影响因子
Advanced Photonics Research
·
2022
·Vol. 3
·期 11
·2200091
·
IF 0
Yifan Gao,Min Wang,Zhen Zhang,Yaming Liu,Jiaheng Zhang,Mingyu Li,Hongjun Ji,Weiwei Zhao,Junyou Wang,Huanhuan Feng
Fluorescent materials are used broadly for anti-counterfeiting, including currency, passports, identity cards, and other secure documents. However, a universal procedure to print fluorescent materials is still missing due to the wide variety of properties found in fluorescent materials. Here, flash nanoprecipitation (FNP) is reported as a universal procedure for fast-fabricating large-scale fluorescent nanoparticles to construct cutting-edge-level encryption in anti-counterfeiting, such as full-color and dual-mode “codes-in-code” large-format fluorescent patterns. The large-format fluorescent patterns are printed with a commercial inkjet printer. They exhibitd high concealment and environmental durability for daily use. The security labels of the 2021 Chinese Racing Pigeon Association (CRPA) certificate are then industrially fabricated based on this universal procedure. The monochrome fluorescent pattern is also upgraded into a full-color fluorescent pattern for evolutionary encryption and anti-counterfeiting. Finally, a “codes-in-code” dual-mode encryption is realized in the UV bands. The results lead to cutting-edge and high-security anti-counterfeiting technology, which will broaden the use of fluorescent materials in anti-counterfeiting due to its universality.
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JOURNAL OF PHYSICAL CHEMISTRY B
·
2022
·
IF 3.466
Jianfeng Xue,Zheng Wang,Hong Zhang,Yan He
Viscoelastic characterization is of great importance for the investigation of biomolecular condensates. Single-particle-tracking-based rotational diffusion analysis of single nanorods is an effective approach for quantitative viscosity measurement. However, in the case of high background and noise with high-speed image acquisition, accurate extraction of diffusivity from the data is a challenging task. Here, we develop a novel frequency-domain-based deep learning (DL) method for single nanorod rotational tracking analysis. We synthesized Brownian rotational time-series data for training, designed a data preprocessing module to reduce the effect of noise, and extracted rotational diffusion coefficient using recurrent neural networks in the frequency domain. Compared with the traditional curve-fitting-based methods, our method shows higher accuracy and a wider detection range for viscosity measurement. We verified our method using experimental data from plasmonic imaging of single gold nanorods (AuNRs) in glycerol solution and PGL droplets. Our method can be potentially applied to the viscosity measurement of different biomolecular condensates in vitro and in vivo.
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PubMed
高影响因子
Polymers
·
2022
·Vol. 14
·期 19
·3941
·
IF 4.967
Xu Gao,Jun-Feng Su,Sai Wang,Peng Yang
Artificial skin composites have attracted great interest in functional composite materials. The aim of this study was to prepare and characterize a smart artificial skin composite comprising a bionic microvascular with both self-nourishing and self-healing functions. A poly(vinyl alcohol)–glycerol–gelatin double network organic hydrogel was used as the artificial skin matrix. The hydrogel had high mechanical strength because of the strong hydrogen bond formed between the PVA and glycerol (GL). The gelatin (GEL) increased the toughness and elasticity of the hydrogel to ensure the strength of the artificial skin and fit of the interface with the body. The bionic polyvinylidene fluoride (PVDF) microvascular had excellent thermal stability and mechanical property in artificial skin. Results indicated that self-nourishing was successfully realized by liquid release through the pore structures of the bionic microvascular. The bionic microvascular healed microcracks in the artificial skin when damage occurred, based on a self-healing test.Keywords:artificial skin;self-nourishing;self-healing;microvascular
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PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Qiyuan Li,Lin Cao,Wei Wang,Xude Qin,Shougang Chen
In this paper, polyurethane (PU) with polyethylene glycol as a soft segment and isophorone diisocyanate as a hard segment were designed and synthesized. Copper complex (Cu(HD) 2 ) was synthesized in PU preparation, bringing excellent self-healing, photothermal and antibacterial properties. The content of Cu 2+ accounted for less than 2wt% of PU elastomer. Cu(HD) 2 acted as a chain extender and provided coordination bonds for elastomer to promote the self-healing process. Experiments showed that Cu(HD) 2 exhibited excellent photothermal properties in PU. The maximum temperature of the samples after 5 min irradiation under a sunlight simulator could reach 120 °C. The results of the self-healing experiment showed that mechanical properties of PU could be recovered by nearly 90%, and electrochemical protection performance could be recovered by nearly 100%. Antibacterial experiments proved that PU could release Cu 2+ , forming an antibacterial ring around PU. PU has excellent application in the field of anticorrosion and antibacterial coatings.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 47
·e53174
·
IF 3.057
Yiwei Dong,Chen Wang,Zhirui Hu,Shujuan Mao,Xiaotong Wei,Yueqing Fu,Jie Li,Jing Han
Currently, sensors based on hydrogels are less sensitive at low temperatures, and discarded sensors are prone to generate e-waste. Thus, it is challenging to design and prepare novel hydrogels with good properties for wearable sensors. Herein, we report a sandwich-structure liquid metal organic hydrogel with low-temperature sensitive, recyclable and multiple sensation properties. Liquid metal (LM)/cross-linked chitosan quaternary ammonium salt (CHACC) composite is prepared by evaporating ethanol and water co-solvent as the core layer. CHACC is used as the top and the bottom layer respectively. The optimal performance of the organic hydrogel is obtained when the volume ratio of ethanol to water is 1:3. The LM/CHACC organic hydrogel exhibits excellent stretchability (strain: 428.37%). Importantly, it has fast responsiveness, recyclability and excellent low-temperature sensitivity (GF = 8.29) at −20°C. The sensors possess stress-temperature sensation with high sensitivity. Moreover, LM as the conductive filler is recyclable under acidic conditions. We demonstrate the functionality of the LM/CHACC organic hydrogel to detect human joint movements and fine movements at low temperatures. It is anticipated to open up new sensing applications based on LM organic hydrogel-based wearable sensors.
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Energy Technology
·
2022
·Vol. 10
·期 12
·2200800
·
IF 4.149
Haoxiang Zhong,Qianqian Hu,Lingzhi Zhang
The shuttle effect of polysulfides severely limits the practical application of lithium–sulfur batteries. Herein, the lithium-rich Li[Li 0.2 Ni 0.2 Mn 0.6 ]O 2 /hierarchical porous graphitic carbon composite (LLNM/HPGC) is designed and synthesized as host material for lithium–sulfur batteries, aiming to restrict the shuttle effect of polysulfides via physical entrapment from 3D HPGC and accelerate the conversion of polysulfides from the lithium-rich LLNM as catalyst. Benefiting from the well-constructed host framework, 1glycerinum-LLNM/2HPGC@sulfur (1Gly-LLNM/2HPGC@S) shows higher specific capacity of 651 mAh g −1 after 200 cycles at 0.5C than that of 546.3, 422.8, 476, and 421.7 mAh g −1 for HPCG@S, Gly-LLNM@S, 1Gly-LLNM/3HPGC@S, and 1Gly-LLNM/5HPGC@S. Therefore, this work demonstrates a promising route to inhibit the shuttle effect of polysulfides for lithium–sulfur batteries.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Hui Liu,Mengya Li,Keyong Tang,Jie Liu,Xiumin Li,Xueping Meng
Conformations of secondary and super secondary structure from bovine hides collagen are very important for constructing collagen molecular space structure, and directly related to its properties. In this work, the evolutional mechanism of the collagen conformation in the environment of sodium sulphide (Na 2 S) solution is periodically studied by FT-IR spectroscopy, the Gaussian peak fitting of secondary derivative, and auxiliary methods such as SDS-PAGE, SEM and TG. As a result, the three polypeptide chains structure of bovine hide collagen was hardly affected by the ions of OH − , HS − and S 2− . The conformation of collagen molecules such as β-turn, triple helix and β-strand were gradually evolved into unordered structure and α-helix with the sequential addition of OH − , HS − and S 2− , which is because the hydrogen bond inside collagen molecular is extended or opened with the increase of the synergistic effect of pH and reducibility of HS − and S 2− in the solution. The bound water content and thermal properties of the treated collagen molecules are decreased. Finally, the order of the hydrolysis ability to collagen is NaOH < NaHS < Na 2 S at the same condition, which was confirmed by measuring the content of hydroxyproline from their solutions after treating the collagen. This work provides very important information for understanding the evolutional mechanism of bovine hide collagen conformation in the Na 2 S solution, developing the alternatives of sulfide, extraction of collagen, tanning, and application of collagen in biological and material science.
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