Materials Advances
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2023
·Vol. 4
·期 7
·1671-1677
·
IF 5
Yi Xu,Xinyue Sun,Keqi Zhu,Shumin Xu,Changhui Liu,Shenghua Xiong,Chao Li
Oily wastewater and oil spills pose a threat to the environment and human health, and absorbing these harmful organics through porous aerogel materials is an efficient method for oil/water separation. Herein, we design degradable, hydrophobic, and mechanical 4,4′-methylenedianiline polybenzoxazine/silicone-based polyhexahydrotriazine aerogels (BOZ/Si-PHT) for efficient oil/water separation. The BOZ/Si-PHT interpenetrating network (IPN) aerogels were successfully prepared by sequential polymerization, followed by atmospheric drying without any additional post-processing. The as-prepared BOZ/Si-PHT aerogels exhibit prosperous hydrophobicity (a water contact angle of 121.5°) and good mechanical properties (a compressive strength of 449.6 kPa). Meanwhile, the BOZ/Si-PHT aerogels possess good absorption capacity of oils or organic solvents ranging from 4.6 to 16.3 times their own weights. More importantly, the BOZ/Si-PHT aerogels show rapid degradation after use. This work provides simple, environmentally friendly and sustainable materials for oil/water separation and the rationally designed hydrophobic BOZ/Si-PHT aerogels display enormous potential for practical applications dealing with oily wastewater and oil spills.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Qiyuan Zheng,Zuoying Cao,Shengxi Wu,Qinggang Li,Mingyu Wang,Wenjuan Guan,Guiqing Zhang
As the production and consumption of lithium-ion batteries increase, high purity Ni(II) and Co(II) products are becoming increasingly critical as key raw materials for battery cathodes. However, the clean and efficient separation of Ni(II) and Co(II) has been a bottleneck problem since they often coexist in ores and secondary resources and have similar ionic radii, oxidation states, and coordination numbers. Thus, this paper proposes a novel extractant (NNPA) and a breakthrough method to separate Ni(II) and Co(II). The effects of chloride ion concentration , pH value, temperature, O/A ratio and extraction time on extractant selectivity and extraction efficiency were investigated. Under optimum conditions, NNPA demonstrated high extraction ability (E = 94.6 %) and selectivity (β Ni(II)/Co(II) = 481) for Ni(II) at pH 0, whereas at pH 6, it has high extraction ability (E = 93.9 %) and selectivity (β Co(II)/Ni(II) = 510.88) for Co(II). To provide in-depth insights into the Ni(II) and Co(II) separation mechanism, based on the single crystal XRD analyses of the extracted Ni(II) complex and the extracted Co(II) complex, DFT calculations were performed. The results show that the extraction order of NNPA is NNPANiHCl 3 > NNPACoCl 2 > NNPANiCl 2 (H 2 O) 2 . Due to the different selectivity of NNPA towards Ni(II) or Co(II) at different pH values, it is able to greatly reduce the consumption of extractant and significantly shorten the extraction process flow by selectively extracting the low concentration Ni(II) or Co(II) from Ni(II)-Co(II) solutions, thereby improving efficiency, reducing energy consumption and achieving cleaning production.
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EUROPEAN POLYMER JOURNAL
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2022
·
IF 5.546
Jieke Ye,Chen Qian,Yubing Dong,Yaofeng Zhu,Yaqin Fu
In this work, organic solvent-induced shape memory poly(ethylene- co -vinyl acetate) (EVA) monoliths are developed based on a facile thermally induced phase separation (TIPS) method. The obtained EVA monoliths show three-dimensional (3D) interconnected porous structures with tunable porosities from 54.52 % to 73.01 %, average pore sizes from 4.8 to 17.5 μm, and satisfactory shape memory properties. Utilizing the hydrophobic nature of EVA, the porous monoliths effectively separate oil/water by selective oil absorption. Moreover, the EVA monoliths exhibiting oil-triggered shape recovery are designed to be expandable oil absorbers, which shows doubled volumetric absorption capacities of 1.96–2.48 g/cm 3 for pentane, hexane, and octane with a prefixed compression strain of 70 %. The uniform porous structures of monolithic materials and shape memory properties of semi-crystalline elastomers are well combined in this work, which will provide new possibilities for the design of smart porous materials or structures for novel oil absorbers, thermal insulators, and flow reactors.
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INDUSTRIAL CROPS AND PRODUCTS
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2022
·
IF 6.449
Shanshan Shao,Laixin Ma,Xiaohua Li,Huiyan Zhang,Rui Xiao
Heavy bio-oil based carbon material (HBC) was prepared via carbonization and activation, and the basic Mg-Al-O/HBC using HBC as the carrier was synthesized for the first time for the aldol condensation of cyclopentanone to produce aviation fuel precursor. It revealed that a higher carbonization temperature and heating rate led to the decreasing production of biochar. HBC presented the highest specific surface area (2046.92 m 2 /g) and total pore volume (1.2964 cm 3 /g) at the carbonization temperature of 700 °C, the heating rate of 15 °C/min, A/C ratio of 3:1, and the activation temperature of 800 °C, in which the largest proportion of micropores was 87.19%. Compared with Mg-Al-O, a higher strength of weak and moderate basic sites was found in Mg-Al-O/HBC, which was beneficial for the aldol condensation. A higher yield of targeted condensates in the range of C9∼C16 was achieved at 87.28% in the aldol condensation of cyclopentanone over Mg-Al-O/HBC catalyst. However, the condensation performance of the composite catalysts decreased seriously in the 5th run, which was related closely to the appearance of boehmite AlO(OH) and the pore blockage of HBC. To match the basic catalyst and HBC carrier well from the viewpoint of pore property, Al ions were substituted with Zr ions, and the yield of the target condensates over Mg-Zr-O/HBC was kept stably at 72.07% at the fifth use. This study provides a unique, viable and effective method to produce porous carbon from heavy fraction of bio-oil as the carbon source, and also its good application in the production of high-valued fuels.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2023
·
IF 8.7
Likai Hu,Fenghua Zhang,Lan Luo,Linlin Wang,Yanju Liu,Jinsong Leng
Phenolic resins equipped with flame retardant and exceptional ablative properties show considerable potential for thermal protection applications. However, phenolic resins typically exhibit poor mechanical properties , as they are brittle, easily pulverized, and difficult to deform. In this study, shape memory phenol–formaldehyde resins (SMPRs) were synthesized through chemical cross-linking reactions and prepared shape memory phenol–formaldehyde foams (SMPFs) using physical foaming techniques. SMPFs exhibited good shape memory properties and deformation capabilities. Compared with other shape memory polymer foams, the SMPFs presented superior thermal stability, and a superior residual carbon rate. Shape memory polymer foam composites (SMPFCs) reinforced with SiO 2 or Al 2 O 3 nanoparticles demonstrated improved thermal stability, and were capable of completing a self-expanding and self-folding process. SMPFs and SMPFCs have the potential to be applied in flexible fireproof materials owing to their excellent deformation properties and high-temperature resistance.
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Science Bulletin
·
2023
·
IF 18.9
Canhui Zhang,Xingkun Wang,Zhentao Ma,Hanxu Yao,Hengjun Liu,Cheng Li,Jian Zhou,Ren Xu,Xusheng Zheng,Huanlei Wang,Qiang Li,Meng Gu,Heqing Jiang,Minghua Huang
Breakthrough in developing cost-effective Fe-based catalysts with superior oxygen reduction reaction (ORR) activities and ultra-long-term stability for application in Zn-air batteries (ZABs) remain a priority but still full of challenges. Herein, the neighboring NiN 4 single-metal-atom and Fe 2 N 5 dual-metal-atoms on the N-doped hollow carbon sphere (Fe/Ni-NHCS) were deliberately constructed as the efficient and robust ORR catalyst for ZABs . Both theory calculations and magnetic measurements demonstrate that the introduction of NiN 4 provides a significant role on optimizing the electron spin state of Fe 2 N 5 sites and reducing the energy barrier for the adsorption and conversion of the oxygen-containing intermediates, enabling the Fe/Ni-NHCS with excellent ORR performance and ultralow byproduct HO 2 − yield (0.5%). Impressively, the ZABs driven by Fe/Ni-NHCS exhibit unprecedented long-term rechargeable stability over 1200 h. This work paves a new venue to manipulate the spin state of active sites for simultaneously achieving superior catalytic activities and ultra-long-term stability in energy conversion technologies.
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PubMed
高影响因子
Pharmaceutics
·
2023
·Vol. 15
·期 6
·1730
·
IF 5.4
Jianmin Chen,Xiaozhen Cai,Wenqin Zhang,Danhong Zhu,Zhipeng Ruan,Nan Jin
Microneedles (MNs) have recently garnered extensive interest concerning direct interstitial fluid (ISF) extraction or their integration into medical devices for continuous biomarker monitoring, owing to their advantages of painlessness, minimal invasiveness, and ease of use. However, micropores created by MN insertion may provide pathways for bacterial infiltration into the skin, causing local or systemic infection, especially with long-term in situ monitoring. To address this, we developed a novel antibacterial sponge MNs (SMNs@PDA-AgNPs) by depositing silver nanoparticles (AgNPs) on polydopamine (PDA)-coated SMNs. The physicochemical properties of SMNs@PDA-AgNPs were characterized regarding morphology, composition, mechanical strength, and liquid absorption capacity. The antibacterial effects were evaluated and optimized through agar diffusion assays in vitro. Wound healing and bacterial inhibition were further examined in vivo during MN application. Finally, the ISF sampling ability and biosafety of SMNs@PDA-AgNPs were assessed in vivo. The results demonstrate that antibacterial SMNs enable direct ISF extraction while preventing infection risks. SMNs@PDA-AgNPs could potentially be used for direct sampling or combined with medical devices for real-time diagnosis and management of chronic diseases.Keywords:microneedles;antibacterial activity;silver nanoparticles;ISF sampling;medical devices
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PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 41
·期 1
·67-74
·
IF 3.815
Yang Xiao,Niu Yan-Fang,Wei Meng-Xiao,Zhang Jun-Ning,Liu Ke-Liang,Du Xin,Gu Zhong-Ze
In this study, we investigate the effect of the exposure dose on the mechanical property of the photoresins generated with acrylate self-polymerization and thiol-ene polymerization. The results indicate that the mechanical performance of the thiol-ene photoresin is highly depended on the exposure dose during the solidification process. With 350-fold exposure dose change, the stiffness of the thiol-ene photoresin reached more that 700-fold change compare to 14-fold of the acrylate photoresin. We developed a TPL photoresist based on our results and show the capability to fabricate microstrucutres with high resolution and variable mechanical performances using this method.
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ACS Omega
·
2022
·
IF 4.132
Jian Bin Zhen,Jiajia Yi,Huan Huan Ding,Ke-Wu Yang
The overuse of antibiotics exacerbates the development of antibiotic-resistant bacteria, threatening global public health, while most traditional antibiotics act on specific targets and sterilize through chemical modes. Therefore, it is a desperate need to design novel therapeutics or extraordinary strategies to overcome resistant bacteria. Herein, we report a positively charged nanocomposite PNs-Cur with a hydrodynamic diameter of 289.6 nm, which was fabricated by ring-opening polymerization of ε-caprolactone and Z-Lys-N-carboxyanhydrides (NCAs), and then natural curcumin was loaded onto the PCL core of PNs with a nanostructure through self-assembly, identified through UV–vis, and characterized by scanning electron microscopy (SEM) and dynamic light scattering (DLS). Especially, the self-assembly dynamics of PNs was simulated through molecular modeling to confirm the formation of a core–shell nanostructure. Biological assays revealed that PNs-Cur possessed broad-spectrum and efficient antibacterial activities against both Gram-positive and Gram-negative bacteria, including drug-resistant clinical bacteria and fungus, with MIC values in the range of 8–32 μg/mL. Also, in vivo evaluation showed that PNs-Cur exhibited strong antibacterial activities in infected mice. Importantly, the nanocomposite did not indeed induce the emergence of drug-resistant bacterial strains even after 21 passages, especially showing low toxicity regardless of in vivo or in vitro. The study of the antibacterial mechanism indicated that PNs-Cur could indeed destruct membrane potential, change the membrane potential, and cause the leakage of the cytoplasm. Concurrently, the released curcumin further plays a bactericidal role, eventually leading to bacterial irreversible apoptosis. This unique bacterial mode that PNs-Cur possesses may be the reason why it is not easy to make the bacteria susceptible to easily produce drug resistance. Overall, the constructed PNs-Cur is a promising antibacterial material, which provides a novel strategy to develop efficient antibacterial materials and combat increasingly prevalent bacterial infections.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Xuan-Ting He,Bo-Yu Li,Jia-Xiang Liu,Wen-Quan Tao,Zhuo Li
The surface chemical composition and building unit structures of membrane are the key factors to realize highly-efficient oil–water separation. Here we report the synthesis of Cu-CAT-1 metal–organic frameworks (MOFs) with unique two-dimensional (2D) hierarchical structures grown directly on copper mesh (Cu-CAT-1@CM) for oil–water separation. The Cu-CAT-1@CM membrane with micro/nano- architecture exhibits robust superhydrophilicity and underwater superoleophobicity characteristics, allowing gravity-driven oil–water separation by achieving ultrahigh flux up to 329 kL∙m −2 ∙h −1 . The membrane shows excellent separation performances by testing various oils, particularly actual crude oil and xylene, which are considered as the notorious pollutants in the water. The residual oil contents of six samples are all less than 24.6 mg∙L -1 . The mechanism analysis demonstrated that the appropriate hierarchical structures of the membrane surface is the code for the extreme wettability that remarkably improved the separation efficiency. Moreover, such a membrane with high performance can be readily synthesized by electrochemical method at room temperature in only 20 min, which shows the advantages of facile and environmentally friendly fabrication process as well as low cost. Overall, the membrane with energy-saving of gravity-driven and ultra-high permeability allows the rapid separation of oil–water mixture, showing the potential applications for resolving the problem of oil pollution.
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Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 3
·2138-2153
·
IF 11.806
Ding Zhaodong,Tian Zhongjian,Ji Xingxiang,Dai Hongqi,Si Chuanling
Inspired by the hydrophobic waxy layer structure on the back of the desert beetle, a super-hydrophobic material was prepared via the sol–gel silanisation of porous cellulose membrane (CM) using triethoxysilanes with different carbon chain lengths (R-siloxane) and (CH 3 CH 2 O) 4 Ti as a catalyst in 3 min. The R-siloxane CM was both super-hydrophobic and oleophilic (water contact angle (CA) > 150°, dodecane CA ≈ 0°) and resisted liquids with surface tensions as low as 15 mN·m −1 , correlated with the length of the R-siloxane and roughness of the CM. Instructed by the water collection behavior of the desert beetle, a pristine filter CM was added on the R-siloxane filter CM to accelerate separation of Span 80–stabilised water-in-oil emulsions by generating a surface energy gradient (SEG). The composite membrane with SEG separated the emulsions with higher surfactant concentrations and provided a higher efficiency up to 99.98% compared with single-layer R-siloxane membrane. This bio-inspired catalytic one-step approach for preparing R-siloxane cellulose composite membranes can potentially replace petroleum-based products for oil purification. Graphical Abstract Bio-inspired preparation of R-siloxane composite cellulose membrane with surface energy gradient for highly efficient water-in-oil emulsion separation.
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Separation Science Plus
·
2022
·Vol. 5
·期 9
·513-519
·
IF 0
Yanni Huang,Jia Chen,Gafang Fu,Chi Zhang,Hongdeng Qiu
This work reported the preparation and evaluation of a 2D porous graphene as the stationary phase for gas chromatography with high-resolution performance from non-polar to polar structural isomers. As a result, the dynamically coated porous graphene capillary column has a film thickness of about 16 μm. After aging treatment at different temperatures, the porous graphene capillary column exhibited high thermal stability up to 300°C. In addition, the porous graphene capillary column has good column repeatability and reproducibility. The retention time RSDs are 2.61–3.90% ( n = 3) during the days and 4.58–4.78% ( n = 3) column-to-column. This work demonstrates the advantageous separation performance of a good potential for the porous graphene as a new stationary phase for gas chromatography analysis.
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