SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Xu Zhu,Lei Zhu,Jianqiang Zhang,Hui Li,Shifan Yu,Ran Wang,Zechen Yan,Jinwei Xue,Qingzhong Xue
Membrane separation is an appropriate method for the treatment of emulsified wastewater. But emulsified wastewater always contains oil droplets with a broad size distribution, and the tiny oil droplets can easily intrude into the pore of membranes during the separation process, which can cause internal fouling of membranes. Reducing the pore size can alleviate this fouling, however, the strategy may cause a decline in flux. Therefore, a more efficient strategy should be proposed. Herein, modified nylon mesh with well mechanical properties and low crude-oil adhesion was chosen for crude-oil/water emulsion. Before the sieve separation, a preprocessing strategy of squeezing coalescence is applied to the emulsion, resulting in the preprocessed emulsion with large and homogeneous crude-oil droplets. And the preprocessed emulsion can be continuously and efficiently separated by the sieving membrane. Compared with directly separating the original emulsion, separating the preprocessed emulsion can prolong the service life of the sieving membrane. The prepared modified nylon mesh and the coupling of the squeezing coalescence process and the sieving process have the practical application value for industrial crude-oil/water emulsion separation.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2022
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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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高影响因子
GREEN CHEMISTRY
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2022
·Vol. 24
·期 19
·7531-7544
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IF 11.034
Chi Huang,Ze-Yong Zhao,Cong Deng,Wei Lin,Yu-Zhong Wang
The low degradability and durability of plastics are a double-edged sword: they enable plastics to have versatile applications in the use phase, but pose environmental challenges at the end-of-life of the plastics. This dilemma requires innovative strategies to strike a balance between the plastic performance and recycling to achieve a sustainable ecosystem. To address the challenges, we constructed a hybrid biocomposite (denoted as EVA/MPAPS) made of an ethylene-vinyl acetate (EVA) copolymer and melamine phytate decorated potato starch (MPAPS), which has tailored recyclable properties, via a recycle-by-design strategy. The EVA/MPAPS presented high performance in fire safety and mechanical behavior in its use phase; at the end-of-life, it could be converted into high-value-added carbons via controlled carbonization for versatile electrochemical applications, thus maximizing the valorization of the biocomposites. The electrochemical performances of the recycled carbons could be manipulated by adjusting their porosity and chemical structure through different carbonization temperatures. The recycled carbons carbonized by EVA/MPAPS at 600 °C (denoted as MPAPS600) exhibited a specific capacitance as high as 207 F g−1 at 1 A g−1, which was almost twice that of a commercial supercapacitor (YP-50F), as well as an excellent rate capability of 72% capacitance retention at 20 A g−1. When the carbonization temperature was elevated to 700 °C, the recycled carbons (denoted as MPAPS700) presented high reversible capacity (204.4 mA h g−1 at 500 mA h g−1), good cycling performance (∼79% retention after 450 cycles) and excellent coulombic efficiency. This work provides a new perspective on the prospects for management of the fabrication, use and upcycling of biocomposites efficiently, thus moving forward towards a circular carbon economy.
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高影响因子
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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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Kaili Wang,Tao Zhang,Xiao Xiao,Xinyu Fang,Xiaorong Liu,Youming Dong,Yanjun Li,Jianzhang Li
Bamboo is easily affected by moisture and mold, etc., causing performance deterioration, which limits the practice application. Phytic acid (PA) as abundant biomass resources , can form the polyelectrolyte complexes with cationic charged compounds, and also the coordination complexes with metal ions . In this work, the green and transparent superhydrophobic coating on bamboo surface was developed by deposition and assembly of PA-based hybrid complexes and subsequent hydrophobic treatment. The micro-/nano- hierarchical structure supported by hybrid complexes and the low energy component provided by octadecylamine both contributed to the excellent superhyophobic performance. The contact angle and sliding angle of the modified bamboo surface were 153.2° and 7.5°, respectively, and exhibited great environment and chemical durability. In addition, the superhydrophobic coating endowed bamboo with mildew resistant property. This work demonstrates the potential of PA-based hybrid complexes as constructing superhydrophobic coatings, and also provides an avenue for the fabrication of green and transparent superhydrophobic coatings on bio-based material surfaces.
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高影响因子
Journal of Materials Chemistry A
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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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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Shaopei Jia,Yifan Cheng,Quan Huang,Qisong Li,Qian Zhang,Zhixin Wang,Yan Zhang,Niu Zhang,Yunchao Mu
Developing inexpensive and efficient electrocatalysts for hydrogen evolution reaction (HER) in both acidic and alkaline mediums is of great significance to the hydrogen energy industry. Hereby, we prepared a mixture of precursors with homogeneous composition by using the chelating ability of soybean protein isolate (C and N source) and phytic acid (dopant and phosphating agent) with cobalt ions , and achieved one-step synthesis and construction of Co 2 P/N–P co-doped porous carbon composite by carbonization at 800 °C. The as-synthesized Co 2 P/NPPC-800 electrocatalyst exhibits low HER overpotentials of 121 and 125 mV at 10 mA cm −2 in 0.5 M H 2 SO 4 and 1.0 M KOH, which are close to those of the commercial Pt/C catalyst. Additionally, the NPPC substrate surrounding the Co 2 P could diminish the corrosion during the HER, and Co 2 P/NPPC-800 displays good stability and durability. Furthermore, this work offers a convenient synthesis strategy for phosphide/doped porous carbon composites in other electrochemical energy technologies.
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ACS Nano
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2022
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IF 18.027
Chunlei Zhang,Guangyu Chu,Zesong Ruan,Ning Tang,Cunfeng Song,Qichao Li,Wenjie Zhou,Jiale Jin,Hossam Haick,Yunfeng Chen,Daxiang Cui
Materials in nature feature versatile and programmable interactions to render macroscopic architectures with multiscale structural arrangements. By rationally combining metal–carboxylate and metal–organophosphate coordination interactions, Au25(MHA)18 (MHA, 6-mercaptohexanoic acid) nanocluster self-assembled structural color coating films and phytic acid (PA)–metal coordination complexes are sequentially constructed on the surface of titanium implants. The Lewis acid–base coordination principle applies for these metal–organic coordination networks. The isotropic arrangement of nanoclusters with a short-range order is investigated via grazing incidence wide-angle X-ray scattering. The integration of robust M–O (M = Ti, Zr, Hf) and labile Cu–O coordination bonds with high connectivity of Au25(MHA)18 nanoclusters enables these artificial photonic structures to achieve a combination of mechanical stability and bacteriostatic activity. Moreover, the colorless and transparent PA–metal complex layer allows the viewing of the structural color and surface wettability switching to hydrophilic and makes feasible the interfacial biomineralization of hydroxyapatite. Collectively, these modular metal–organic coordination-driven assemblies are predictive and rational material design strategies with tunable hierarchy and diversity. The complete metal–organic architectures will not only help improve the physicochemical properties of the bone–implant interface with synergistic antibacterial and osseointegration activities but also can boost surface engineering of medical metal implants
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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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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高影响因子
MACROMOLECULAR RESEARCH
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2022
·Vol. 30
·期 8
·536-546
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IF 2.127
Wang Huan,Li Li,Kang Yan,Yin Xue,Lei Xuedi,Yang Jing,Xi Hui,Xu Xueqing,Yang Zhiwang,Lei Ziqiang
To reduce the fire hazard of epoxy resin (EP), PA-CS-M (where PA = phytic acid, CS = chitosan, M = Cu 2+ , Co 2+ , Al 3+ , Zn 2+ , Mn 2+ ) environmental friendly flame retardant is prepared by a simple and green method. By comparing the data after cone calorimetry test (CCT) of various composites, it is found that when 5 wt% PA-CS-Mn is added to EP, it has good flame retardant and smoke suppression performance. The peak heat release rate (pk-HRR) decreased by 38% and the smoke production rate (SPR) decreased by 33%. In addition, some toxic smoke such as CO has been significantly inhibited. The structures and morphologies of the materials were investigated by Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). When combined with expandable graphite (EG), it is found that when the ratio of PA-CS-Mn to EG is 1:5, the pk-HRR value and SPR value decreased by 69.8% and 66.6%, respectively. More importantly, the mechanical properties of the EP composites have also been greatly improved. The flexural modulus reaches 5.04 GPa, which is 52.3% higher than pure EP, and the flexural strength increases to 79.4 MPa, which also shows an increase of 41.4% as to the matrix.
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高影响因子
POLYMER
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2022
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IF 4.432
Jian Xu,Junhao Fei,Tao Tang,Meng Ma,Yanqin Shi,Huiwen He,Si Chen,Xu Wang
In this paper, a bio-based flame retardant PA-AR is synthesized, which endows PLA with good flame retardant and crystallization properties, and at the same time promotes the biodegradability of PLA. Only 1 wt% PA-AR makes the LOI value of PLA reach 26.8% and reaches UL-94 V-0 level. In addition, 1 wt% PA-AR increases the crystallinity of PLA to 23.4%, which increased by 460% compared with PLA. Further, due to the increase of crystallinity, the tensile strength is also improved. Besides, the addition of PA-AR can greatly promote the degradation performance of PLA under specific biological conditions. This work proposed a novel method to obtain completely biodegradable flame retardant composites.
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高影响因子
APPLIED SURFACE SCIENCE
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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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高影响因子
危险品化学品经营许可证（带存储）