SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Ruixian Zhang,Xiuxiu Ren,Pingxiong Cai,Lei Zhong,Yanyue Lu,Zeguang Zhou
Efficient separation materials with multifunctional and switchable properties are urgently needed to treat submicron-scale oily droplets. Herein, tannic acid (TA) and polyethylenimine (PEI) were blended with poly(vinylidene fluoride) (PVDF) and used to coat a polydimethylsiloxane (PDMS)-modified non-woven fabric immersed in a CuSO 4 /H 2 O 2 coagulation bath. TA and PEI form a phenolamine hydrophilic network that migrates to the surface and firmly binds to the PVDF substrate. CuSO 4 catalyses the H 2 O 2 oxidation, promoting the self-polymerisation of phenol hydroxyl group for forming a carboxyl group. Furthermore, the remaining Cu 2+ ions complex with TA to form a metal–phenol cross-linked network. A double-cross-linked hydrophilic layer with polyphenols as connection points was formed on the PVDF surface. The hydrophilic contact angle of the membrane reached 0°. A rough structure with PDMS micro-/nanoparticles was constructed on the PVDF underside via surface nanocasting and the hydrophobic contact angle of the membranes reached 165°. In experiments, each side of the obtained Janus membranes demonstrated surface superhydrophilic and superlipophilic properties and a high flux and excellent separation efficiency for various oil–water emulsions. The integrated Janus membranes are suitable for unidirectional liquid collection, oil–water emulsion separation, cationic pigment adsorption and dealing with complex dye–emulsion pollutants. The integrated structure formed by the hydrophilic layer and the membrane enhances the fouling resistance of the membrane and the removal rate of pollutants reached >99 %. This research presents a simple approach to prepare Janus membranes with asymmetric wettability.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yan Li,Zhihao Xu,Liqin Tang,Fujun Wang,Lu Wang
The escalating utilization of antibiotics and the subsequent evolution of drug resistance among patients have created an urgent imperative to advance antibiotic-free treatment methodologies. In this work, we have developed nanofibrous wound dressings with synergistic antibacterial activity. Our approach involves the layerwise co-assembly of benzalkonium chloride (BC) and metal–organic framework nanoparticles (MOFs, PCN-224) onto poly(ε-caprolactone) (PCL) electrospun nanofibrous membranes (ENMs) using a tannic acid (TA)-assisted adhesion strategy. The electrostatic interaction between the pyrogallol groups of TA and the charged BC under alkaline conditions enables this strategy. Furthermore, the catechol motifs of TA enhance the ENMs' versatility in adhesion and serve as reactive linkers for further co-assembly of PCN-224. The resulting PCL/TA@BC/MOFs (PTM) composites exhibit high loading efficiency of PCN-224, excellent physiological stability, desirable biocompatibility, and synergistic bactericidal therapy. The PTM composites employ dual bacterial defense mechanisms, with PCN-224 converting illumination into singlet oxygen ( 1 O 2 ) for photodynamic effects, while the hydrophobic alkyl chain of BC inhibits bacterial growth by disruption of lipid packing of the bacterial membrane. In vitro and in vivo experiments demonstrate that the PTM composites achieve bactericidal rates exceeding 99.99% against Escherichia coli , Staphylococcus aureus , and methicillin-resistant Staphylococcus aureus (MRSA) with only 10 min of irradiation. This breakthrough contributes to the rapid recovery of MRSA-infected wound sites with minimal biological burden. Overall, our rational design of a wound dressing with synergistic bactericidal therapeutic effects presents a novel intervention for enhancing wound disinfection in clinical settings.
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DESALINATION
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2023
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IF 9.9
Jinsong He,Tingyan Deng,Linzhi He,Xiaochan An,K.G. Nadeeshani Nanayakkara,Fei Shen,Yanzong Zhang,Jianmei Zou,Li Zhao
From the view of sustainable development, the loose nanofiltration (LNF) membrane with high permeability and excellent separation of dye/salt mixture becomes more attractive for dye-containing wastewater. However, the previous LNF membranes inevitably suffered from the permeability-selectivity trade-off due to the inherent nature of polymer-based selective layer. This study reported a tannic acid (TA)-MoS 2 nanosheets (NSs) interlayered nanocomposite polyester (PE) LNF membrane (iLNF-3) that exhibited a remarkably enhanced water permeance of 55.8 LMH·bar −1 compared to the control LNF membrane of 27.3 LMH·bar −1 , and a higher separation selectivity of dye/salt (rejection rate: 99.6 % for congo red, 98.0 % for methyl blue, 5.6 % for Na 2 SO 4 , respectively). Furthermore, the iLNF-3 showed high ionic interference resistance, long-term stability, and superior antifouling performance. The enhanced permeance and dye/salt separation were mainly attributed to the introduction of a high-permeability TA-MoS 2 NSs interlayer . In particular, the permeability was improved due to the “gutter” effect and nanochannels and the formed thinner PE selective layer caused by TA-MoS 2 NSs interlayer. Notably, the selectivity was enhanced owing to the looser porous structure of PE layer resulting from the slow diffusion rate of aqueous monomer . This study can provide a foundational framework for the development of iLNF membranes for treating dye containing wastewater.
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ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Wen Li,Shunxin Wu,Simou Li,Xiyang Zhong,Xiaobo Zhang,Hao Qiao,Meicun Kang,Jinghan Chen,Ping Wang,Lu-Qi Tao
Gesture recognition systems epitomize a modern and intelligent approach to rehabilitative training, finding utility in assisted driving, sign language comprehension, and machine control. However, wearable devices that can monitor and motivate physically rehabilitated people in real time remain little studied. Here, we present an innovative gesture recognition system that integrates hydrogel strain sensors with machine learning to facilitate finger rehabilitation training. PSTG (PAM/SA/TG) hydrogels are constructed by thermal polymerization of acrylamide (AM), sodium alginate (SA), and tannic acid-reduced graphene oxide (TA-rGO, TG), with AM polymerizing into polyacrylamide (PAM). The surface of TG has abundant functional groups that can establish multiple hydrogen bonds with PAM and SA chains to endow the hydrogel with high stretchability and mechanical stability. Our strain sensor boasts impressive sensitivity (Gauge factor = 6.13), a fast response time (40.5 ms), and high linearity (R2 = 0.999), making it an effective tool for monitoring human joint movements and pronunciation. Leveraging machine learning techniques, our gesture recognition system accurately discerns nine distinct types of gestures with a recognition accuracy of 100%. Our research drives wearable advancements, elevating the landscape of patient rehabilitation and augmenting gesture recognition systems’ healthcare applications.
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ACS Omega
·
2023
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IF 4.1
Jianqiao Kong,Song Xu,Yang Dai,Yi Wang,Yun Zhao,Peng Zhang
Chemotherapeutic agents fail in clinical chemotherapy in the absence of targeting and acquired resistance. We, therefore, synthesized Fe3O4@ZIF-8@Sor@TA nanocomposite drugs based on the drug delivery properties of nanomaterials. ZIF-8 is a nanomaterial with a porous structure that can load anticancer drugs. The nanodrug used the paramagnetic property of Fe3O4 to deliver sorafenib (Sor) precisely to the tumor site, then used the pH responsiveness of ZIF-8 to slowly release Sor in the tumor microenvironment, and finally used tannic acid (TA) to inhibit P-glycoprotein to suppress the Sor resistance. The results of material characterization presented that the prepared material was structurally stable and was able to achieve a cumulative drug release of 38.2% at pH 5.0 for 72 h. The good biocompatibility of the composite was demonstrated by in vitro and in vivo experiments, which could improve antitumor activity and reduce Sor resistance through magnetic targeting TA. In conclusion, the Fe3O4@ZIF-8@Sor@TA material prepared in this study demonstrated high antitumor activity in hepatocellular carcinoma treatment, promising to reduce drug resistance and providing a novel research approach for cancer treatment.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 52
·2308845
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IF 19
Yongji Li,Zhongyuan Tian,Xuan-Zhi Gao,Hao-Yu Zhao,Xiaofeng Li,Zhong Lin Wang,Zhong-Zhen Yu,Dan Yang
A self-powered and sustainable traffic monitoring system is highly required for future urban development. Herein, self-healable piezoresistive sensors and triboelectric nanogenerators (TENGs) are constructed by in situ polymerization of polyvinyl alcohol-polyacrylamide double network hydrogel in the presence of sodium alginate and tannic acid-modified cellulose nanocrystals (denoted as PPC) for all-weather self-powered intelligent traffic monitoring applications. Because of hydrogen bonding and boron ester bonding, the resultant PPC-based strain sensor can rapidly self-heal and restore its sensing ability within 1 min with a self-healing efficiency of 97.4%. Based on piezoresistive effect, the ions in sodium alginate endow the PPC-based strain sensor with a relatively high gauge factor of 8.39, which can monitor the motion and fatigue of drivers. Based on triboelectrification effect, the PPC-based TENG sensor can detect instantaneous vehicle speed, judge traffic accident liability, evaluate vehicle weight, and alert the driver to prevent accidents caused by drowsy driving. After partially replacing water in the PPC with glycerin, the resulting PPC-based TENG sensor exhibits stable performance at temperatures ranging from -30 to 40 °C, ensuring its all-weather monitoring ability. The all-weather and self-powered intelligent traffic monitoring system is promising for ensuring the security of future cities.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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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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Small
·
2021
·Vol. 17
·期 7
·2005865
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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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IET Nanobiotechnology
·
2021
·Vol. 15
·期 7
·619-626
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IF 1.847
Rong Cai,Long Xiao,Miaomiao Zhang,Lulu Zhao,Jingjing Zhang,Fengyi Du,Zhirong Wang
Although multidrug combinations are an effective therapeutic strategy for serious disease in clinical practice, their therapeutic effect may be reduced because they conflict with each other medicinally in certain cases. Hence, there is an urgent need to develop a single drug carrier for precise multidrug delivery to avoid this interference. A reverse coordination method is reported that fabricates a double-layer barium sulphate microcapsule (DL@BS MS) for two drugs separately loading simultaneously. In addition, BS nanoclusters were synthesised in situ inside the DL@BS MSs for real-time computed tomography (CT) imaging. The results showed that the DL@BS MSs with a particle size of approximately 2 mm exhibited a uniform sphere. Because BS nanoclusters have a high X-ray attenuation coefficient, the retention of DL@BS MSs in the digestive tract could be monitored through CT imaging in real time. More important, the core-shell structure of DL@BS MSs encapsulating two different drugs could be released in spatiotemporal order in an acidic stomach environment. The as-synthesis DL@BS MSs with a core-shell structure and real-time imaging performance provide an ideal carrier for the oral administration of multiple drugs simultaneously loaded but sequentially released.
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CHEMICAL ENGINEERING JOURNAL
·
2021
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IF 13.273
Jia Lei,Huanhuan Liu,Changpeng Yuan,Qiang Chen,Ji-An Liu,Fengchun Wen,Xinying Jiang,Wenjie Deng,Xudong Cui,Tao Duan,Wenkun Zhu,Rong He
The efficient, safe, and low-cost treatment of uranium-containing wastewater is still an urgent and meaningful problem. The uranium-containing wastewater system commonly contains a variety of soluble organics, which complex with hexavalent uranium (U(VI)) and thus increase the difficulty for U(VI) treatment. Herein, we introduced oxygen vacancy into WO 3 nanosheets to achieve highly efficient photocatalytic reduction of U(VI) and photo-degradation of organics. The WO 2.78 nanosheets showed U(VI) removal ratio of 95.6% with the reduction ratio of 84.5% in 8 mg/L of U(VI). Additionally, the maximum extraction capacity of U(VI) on WO 2.78 nanosheets reached 507.2 mg/g at 200 mg/L of U(VI). Meanwhile, the presence of excessive interfering ions and the cycle use of the WO 2.78 nanosheets hardly decreased the removal ratio of U(VI). The mechanistic study demonstrated that the introduction of oxygen vacancies not only broadened the response range of visible light, but also increased the adsorption of U(VI) over WO 3 nanosheets. Moreover, the decreased reduction potential of WO 2.78 nanosheets to U(VI) verified the enhanced photocatalytic activity of WO 2.78 nanosheets. Our work provided a successful example for the promotion of reduction efficiency toward U(VI) pollutants by the vacancy engineering in metal oxides.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 12
·17964-17976
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IF 4.223
Chen Heng,Liu Fengjun,Cai Chenjian,Wu Hao,Yang Linjun
A novel adsorbent consisting of tannic acid (TA) immobilized on graphene oxide (GO) was proposed and used to remove Hg 2+ from desulfurization wastewater. The morphology and physicochemical properties of tannin-immobilized graphene oxide (TAIGO) were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The characterization results showed that TA was successfully immobilized on GO, and that new functional groups were introduced on TAIGO. The effects of contact time, adsorbent dose, pH, and ion components on removal efficiency were evaluated. The adsorption process was found to be complete within 15 min, and the removal efficiency increased with increasing adsorbent dosage. The pH value affected the protonation of TAIGO and the form of Hg 2+ in wastewater. High concentrations of Cl − and SO 3 2− hindered the adsorption performance, whereas SO 4 2− and cations had a negligible effect. In addition, the excellent economic benefits of TAIGO were analyzed in an economic evaluation, and the Hg 2+ removal efficiency remained at 88% after three recycles. A pseudo-second-order kinetic model ( R = 0.9995) was used to fit the adsorption process, and the oxygen-containing functional groups and chelation reaction played critical roles in adsorption. TAIGO is a low-cost adsorbent with high Hg 2+ removal efficiency and could be further used in practical desulfurization wastewater. Graphical abstract
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Bioactive Materials
·
2021
·
IF 14.593
Xingjie Yin,Jingli Ren,Wei Lan,Yu Chen,Mengping Ouyang,Hua Su,Lianbin Zhang,Jintao Zhu,Chun Zhang
Although common in clinical practice, bleeding after tissue puncture may cause serious outcomes, especially in arterial puncture. Herein, gelatin-tannic acid composite hydrogels with varying compositions are prepared, and their adhesive properties are further optimized in microfluidic channel-based simulated vessels for haemostasis in arterial puncture. It is revealed that the composite hydrogels on the syringe needles used for arterial puncture should possess underwater adhesion higher than 4.9 kPa and mechanical strength higher than 86.0 kPa. The needles coated with the gelatin-tannic acid composite hydrogel completely prevent blood loss after both vein and arterial puncture in different animal models. This study holds great significance for the preparation of haemostatic needles for vessel puncture, and gelatin-tannic acid hydrogel coated needles may help to prevent complications associated with arterial puncture.
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