MATERIALS CHEMISTRY AND PHYSICS
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2022
·
IF 4.778
Jianjian Luo,Congling Shi,Xiaodong Qian,Keqing Zhou
The flame-retardant efficiency of a single flame retardant is often not as expected, but the process of synthesizing new high-efficiency flame retardants is usually complicated and harsh. Here, a bio-based polyelectrolyte complexes (PA-Ni-PEI) was synthesized by reacting biomass phytic acid, nickel ion and polyethylenimine, and then incorporated into EP as a flame-retardant additive for improving the thermal stability and flame retardancy properties. When the adding of PA-Ni-PEI complexes is 2.0 wt%, the peak heat release rate (PHRR), the total heat release (THR), the total smoke release (TSR) and smoke factor (SF) with a reduction of 30.4%, 24.9%, 36.0% and 55.4%, respectively, and the char residue was improved by 53.9%, compared to EP. The improvement in fire safety was ascribed to the early degradation of EP catalyzed by the decomposition products of the composites, resulting in the formation of a dense, robust and stable cross-linked char layer to prevent heat and oxygen from contacting with epoxy resin . Simultaneously, water and nitrogen-containing incombustible gas are released to reduce the concentration of combustible gas. A new idea for the preparation of EP composites with excellent flame retardancy property was provided by this work.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Weifu Sun,Yaru Sun
In this work, meta-kaolinite has been successfully multidimensionally modified by growing melamine-phytate nanoflakes within the interlayer and on the surface of metakaolinite via facile and green supramolecular self-assembly technology . Then, multidimensionally modified metakaolinite (Mul-K 0 ) along with intumescent flame retardant (IFR) has been incorporated into polyurea (PUA)The incorporation of Mul-K 0 together with IFR into PUA has simultaneously enhanced both the fire safety and mechanical property. Flame retardancy and smoke suppression of Mul-K 0 based PUA/IFR composite have been evaluated by oxyacetylene ablation test, limiting oxygen index, UL-94 vertical burning and conventional or modified cone calorimeter tests. The underlying mechanism of Mul-K 0 responsible for enhancing the fire safety and mechanical properties were explored. This work offers a new strategy for improving the flame-retardancy efficiency utilizing the synergistic effect of IFR and modified meta-kaolinite and provides a promising opportunity for fabricating long-life flame retardant PUA composites.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Tengyang Zhu,Shutong Liu,Qing Xia,Ming Yi,Huan Liu,Hai Dong,Yan Wang
Polyamide (PA)-based thin film composite (TFC) membranes have been extensively applied in various membrane-based separations. However, research works for bioethanol purification are relatively limited due to insufficient hydrophilicity and chain packing density of the PA selective layer by conventional interfacial polymerization. In this work, a new TFC hollow fiber (HF) membrane is fabricated by metal-assisted multiple crosslinking strategy, that is, metal-coordinated crosslinking of the pristine PA layer and coordination complexation between metal ions and phytic acid (PhA) for advanced water/ethanol separation. By tuning coordination abilities of metal ions with PA and PhA and the cycle number of PhA/metal ion assembly, PA-based TFC HF membrane is perfected. Additionally, a joint experiment/simulation characterization is deployed to reveal the coordination abilities of various metal ions with the pristine PA and grafted PhA. Ultimately, the synergistic effect between PA layer and PhA-metal ion complexes (i.e., 1 + 1 > 2 effect) is embodied in the separation performance of water/ethanol separation. The resulting TFC-Fe 3+ -PhA membrane with the strongest PhA-metal ion coordination ability exhibits the best water/ethanol separation performance, i.e., the separation factor of 1703 (34 times higher than pristine PA TFC HF membrane) and total flux of 1705 g/m 2 h. This metal-assisted multiple crosslinking strategy is therefore believed to shed important lights on the development of next-generation high-performance TFC membranes for bioethanol purification.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 29
·15485-15496
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IF 14.511
Le Geng,Lele Li,He Zhang,Minjuan Zhong,Peng Mu,Jian Li
Solar-driven interface water evaporation has been demonstrated to be one of the most promising technologies for alleviating global water pollution and water shortage. Although significant advances have been achieved for improving the solar-to-vapor efficiency, the design and fabrication of an all-day solar steam generator with highly efficient evaporation performance still remains a challenge due to the day/night cycle. Herein, we report a novel solar-driven interfacial evaporator composed of a polypyrrole impregnated nylon thread as the photothermal layer and octadecane/carbonized polypyrrole nanotube aerogel composite materials as the photothermal energy storage device to achieve highly efficient all-day solar steam generation. By the combination of photothermal conversion and photothermal energy storage, the as-prepared solar steam evaporator achieves a high evaporation rate of 2.62 kg m−2 h−1 and excellent solar-to-vapor efficiency of 92.7% under 1 kW m−2 illumination. Moreover, the evaporator exhibits excellent salt resistance and there was no obvious salt precipitation observed with 6 h continuous evaporation in 3.5% NaCl aqueous solution. Besides, in the outdoor experiment, the evaporator shows high water production of 8.42 L m−2 in the daytime and 1.22 L m−2 in the nighttime. The findings of this work may provide a novel strategy for the fabrication of the all-day solar-driven interface water evaporation device to mitigate freshwater scarcity, and meanwhile this work lays the foundation for breaking the restriction of the day/night cycle during the solar steam generation process.
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APPLIED SURFACE SCIENCE
·
2022
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IF 7.392
Zhang Jianqiang,Li Hui,Liu Peizhi,Liu Xilu,Gan Shaopeng,Chang Xiao,Zhu Lei,Wei Baojun,Xue Qingzhong
Oily wastewater, mainly from the petroleum related industries, have posed on extremely serious waste of water resources and oil resources. Superwetting membrane technology is considered to be the most effective method to treat oily wastewater. And a scalable strategy to prepare robust superhydrophilic membrane is the core issue. In this work, a superhydrophilic mesh was successfully prepared via facile oxidation and coating strategy. The oxidative treatment successfully fabricated large-scale uniform hierarchical morphologies on mesh. And the coating of sodium alginate/phytic acid hydrogel on the hierarchical mesh synthesized tough and controllable superhydrophilic layer, based the hydrogen-bonded-ionic double-network design. This developed mesh was superhydrophilic, underwater superoleophobic (∼171°) and antifouling. And this mesh also possessed strong mechanical durability, excellent chemical durability, ultra-high separation fluxes (28,220–54,340 L·m −2 ·h −1 ) and rejections (99.99%) for separating oily wastewater. In addition, with the assistance of calcination, this mesh could be recyclable. This developed mesh with recyclability and scalability looks promising for low-cost, large-scale and long-term treatment of oily wastewater.
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 33
·2204366
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IF 19.924
Xiaohui Yu,Haopeng Zhang,Yufei Wang,Xiaoshan Fan,Zibiao Li,Xu Zhang,Tianxi Liu
Herein, novel conductive composite hydrogels are developed with high stretchability, ultra-softness, excellent conductivity, and good self-healing ability. The hydrogels are formed in the water/glycerol binary solvent system, in which the polyaniline nanoparticles (PANI-NPs) are incorporated into the poly(poly(ethylene glycol) methacrylate-co-acrylic acid) (P(PEG-co-AA)) scaffolds via the dynamically electrostatic interactions and hydrogen bonds. The PANI-NPs serve as conductive fillers to assign conductivity to the hydrogel, while the enhanced interfacial interactions between the PANI-NPs and P(PEG-co-AA) matrix endow the hydrogel with high stretchability (>1000%), low modulus (≈6 kPa), excellent elasticity (η = 0.07, energy loss coefficient at 500% strain), and fast self-healing ability (93.3% after 10 mins). Particularly, the desirable anti-freezing property is achieved by introducing a binary solvent system. The composite hydrogel-based sensors are proposed, with the states-independent properties, low detection limit (0.5% strain and 25 Pa), highly linear dependence, and excellent anti-fatigue performance (>1000 cycles). In addition, during the practical wearable sensing tests, various external stimulus and human motions can be detected, including speaking, writing, joint movement, or even small water droplets, indicating the potential applications for the next generation of epidermal sensors.
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ACS Applied Energy Materials
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2022
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IF 6.959
Xiaochun Zheng,Yidi Wang,Shoutian Ren,Qixiao Gai,Wenjun Liu,Quanli Dong
Interface defects are one of the main factors for inefficient photoelectric conversion of nanocomposites, which is also suitable for the photocatalytic nanosystem containing photosensitizers and co-catalysts, so the efficient passivation of interface defects can enhance their photocatalytic performance. In this work, P-doped C3N4 (P–C3N4) was prepared by the thermal polymerization of urea with phytic acid as the P doping source. Then, the doped P atoms could act as anchoring sites for photodeposited Ni nanoparticles (NPs) on P–C3N4, and Ni–P–N bonds were spontaneously formed between Ni NPs and P–C3N4 with doped P as the bridging ligand. The optimal H2 evolution rate of P–C3N4/Ni-20 is 1.56 mmol g–1 h–1, which is 52.0 and 6.0 times that of C3N4 and C3N4/Ni-30, respectively, and even 2.0 times that of P–C3N4/Pt-2%. Its apparent quantum efficiency of 4.35% at 420 nm was 6.9 times that of reference C3N4/Ni-30 without P doping. The optimized interface transfer of carriers by the formed Ni–P–N bonds between P–C3N4 and Ni NPs was the main factor for the enhanced photocatalytic performance of C3N4.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Jie Huang,Zhirong Liu,Dejuan Huang,Tianxiang Jin,Yong Qian
In order to efficiently extract uranium from uranium-containing wastewater, a novel acid doped polypyrrole/carbon felt (PA-PPy/CF) electrode was prepared via a facile electrodeposition method. For this material, PA and PPy combined to form a stable chemical structure by a charge compensation mechanism. The electrochemical characterization results showed that PA-PPy can significantly accelerate the electrochemical reduction rate of uranium ions. Moreover, a double potential step technique (DPST) was applied to prevent water splitting and maintained the electrocatalytic reduction activity of the surface groups during the electrochemical adsorption process . The removal efficiency obtained by the DPST method was six times higher than that obtained by the conventional chemical adsorption . When the concentrations of uranyl nitrate were 10, 20, 50, and 100 mg/L, the removal efficiencies of uranium were 98.8%, 98.1%, 94.6%, and 93.7%, and the adsorption capacities of uranium were 164.7, 326.9, 788.5, and 1562.0 mg/g, respectively. This material also showed an excellent recycling performance and remarkable selectivity for uranium ions. This work may shed light on the development of removal system for uranium (VI).
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Shifeng Zhang,Shupin Chen,Hongqiang Li,Xuejun Lai,Xingrong Zeng
With the increasing environmental pollution by frequent spill accidents and industrial wastewater emissions, superhydrophobic materials for oil-water separation have attracted considerable attention. Herein, we proposed a facile method to prepare superhydrophobic, flame-retardant and magnetic polyurethane sponge (SFRM-PUS) for oil-water separation. Firstly, pristine PUS was immersion-coated with ferric oxide (Fe 3 O 4 ) nanoparticles , graphene oxide (GO) and phytic acid, and then treated with hydroiodic acid (HI) to reduce GO and modified with perfluorooctyltriethylsilane to provide low surface energy . The SFRM-PUS had a high water contact angle of 156° and a low water sliding angle of 8.9°, and exhibited excellent anti-adhesion property and high oil-water separation efficiency of 98.9%. By means of the magnetic property, the SFRM-PUS was also applied for the removal of oil from water in specified area. In addition, the SFRM-PUS showed superior flame-retardant performance, and the ignited flame extinguished within only 4 s. Our findings conceivably provided a new strategy to prepare functional superhydrophobic materials for the treatment of oil spill accidents and industrial sewage emissions.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 6
·2795-2804
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IF 1.754
Luo Qingyun,Jin Tianxiang,huang Jie,Liu Zhirong,Huang Dejuan,Qian Yong
Abstract A novel phytic acid-doped sodium alginate aerogel (Alg-PA) was prepared via a simple doping and freeze-drying method and was used as a self-supporting electrode material to remove uranium ions from aqueous solutions. The effects of chemical composition, UO 2 2+ concentration, solution pH, and applied voltage on the adsorption of UO 2 2+ were investigated. Chemical adsorption was found to be the main mechanism of uranium adsorption and the application of voltage can effectively improve the adsorption capacity and adsorption rate in this removal system. The experimental maximum capacity of the Alg-PA electrode was 430.8 mg/g, while the theoretical maximum capacity of Alg-PA was found to be 563.8 mg/g. Moreover, Alg-PA also has a good reusability and selectivity to uranium ions. These advantages make Alg-PA a promising material for extracting of uranium from uranium-containing solutions. Graphical abstract
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ACS Nano
·
2022
·
IF 18.027
Qirui Liang,Qizhen Li,Lei Xie,Hui Zeng,Shan Zhou,Yanan Huang,Miao Yan,Xin Zhang,Tianyi Liu,Jie Zeng,Kang Liang,Osamu Terasaki,Dongyuan Zhao,Lei Jiang,Biao Kong
Hydrogen evolution reaction (HER) through water splitting is a potential technology to realize the sustainable production of hydrogen, yet the tardy water dissociation and costly Pt-based catalysts inhibit its development. Here, a trapping–bonding strategy is proposed to realize the superassembly of surface-enriched Ru nanoclusters on a phytic acid modified nitrogen-doped carbon framework (denoted as NCPO-Ru NCs). The modified framework has a high affinity to metal cations and can trap plenty of Ru ions. The trapped Ru ions are mainly distributed on the surface of the framework and can form Ru nanoclusters at 50 °C with the synergistic effect of vacancies and phosphate groups. By adjusting the content of phytic acid, surface-enriched Ru nanoclusters with adjustable distribution and densities can be obtained. Benefiting from the adequate exposure of the active sites and dense distribution of ultrasmall Ru nanoclusters, the obtained NCPO-Ru NCs catalyst can effectively drive HER in alkaline electrolytes and show an activity (at overpotential of 50 mV) about 14.3 and 9.6 times higher than that of commercial Ru/C and Pt/C catalysts, respectively. Furthermore, the great performance in solar to hydrogen generation through water splitting provides more flexibility for wide applications of NCPO-Ru NCs.
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高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 22
·4293-4305
·
IF 7.571
Ning Gan,Wei Qin,Chunlei Zhang,Ting Jiao
Postoperative infection and poor osteogenesis will cause the failure of dental implant surgery. Thus, the antibacterial and osteogenic activities are the core requirements for the surface modification of dental implants. Inspired by the strong chelating ability of naturally occurring phytic acid (PA), an in situ deposition method on the surface of titanium implants was developed based on the metal–phosphate coordination networks. Biologically relevant metal cations (i.e. ferric ions and divalent copper ions) were selected as metal constituents for the construction of organic–inorganic coordination network films. The stability of PA–metal coordination bonds is rationally explained by the chemical nature of transition metal elements. This PA–metal coordination complex coating exhibited an excellent antibacterial activity against Porphyromonas gingivalis, reducing the bacterial implant colonization by > 3.92 log10. The abundant phosphate groups greatly increased the surface hydrophilicity, promoted the early adhesion of proteins, improved the proliferation of bone marrow mesenchymal stem cells, and finally achieved an enhanced osteogenic activity. In addition, the phosphate groups of PA also facilitated the deposition of hydroxyapatite by providing reaction sites to chelate with calcium ions. These findings evaluate the anti-bacterial and osteogenic potentials of PA–metal coordination complexes, and clarify the feasibility for surface modification of dental implants.
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