Journal of Natural Fibers
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2022
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IF 3.507
Xinhua Liu,Hailong Liu,Yinchun Fang
In this study, intumescent flame retardant coating of polyethylenimine/phytic acid (PEI/PA) with gradient structure was constructed on cotton fabric through a facile layer-by-layer (LBL) assembly method. The LOI value of coated cotton fabric reached over 40%, indicating excellent flame retardancy. Reasonable controlling the LBL assembly process of PEI/PA coating brought less influence to the physical properties of cotton fabrics. And the coated cotton fabric revealed good flame retardant washing durability. Thermogravimetric analysis results of coated cotton fabrics showed that PEI/PA flame retardant coating changed the thermal decomposition process and promoted char formation revealing the obviously condensed phase flame retardant action. SEM images of char residues revealed that PEI/PA flame retardant coating promoted to form the intumescent flame retardant (IFR) char layer showing obvious IFR action. This research provides novel strategy for the development of high-efficiency flame retardant cotton fabric with good durability and physical properties using a simple LBL assembly method.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Hao Lei,Shilong Song,Ning Pan,Hao Zou,Xiaoqiang Wang,Xianguo Tuo
Achieving efficient uranium adsorption from highly acidic wastewater is still considered challenging. Here, an inorganic-organic hybridized self-assembly material (rPFE-10) with redox activity was constructed by phytic acid (PA), ethylenediamine (EDA), and Fe(II) via a facile one-pot route, and further applied for U(VI) removal. In the static adsorption experiment, rPFE-10 achieved the maximum U(VI) adsorption capacity of 717.1 mg/g at the optimal pH of 3.5. It also performed preeminently in a highly acidic condition of pH = 1.0, with the highest adsorption capacity of 551.2 mg/g and an equilibrium time of 30 min. Moreover, rPFE-10 exhibited a pH-responsive adsorption selectivity for U(VI) and An-Ln ( S (U(VI) ) and S (An-Ln) ), which increased to 69 % and 94 % respectively as pH decreased from 3.0 to 1.0. Additionally, the spectral analysis revealed a reconstruction mechanism induced by multiple synergistic adsorption, in which U(VI) exchange with EDA +/2+ and Fe 2+/3+ and earned suitable coordination geometry and ligand environment to coordinate with PA (mainly P-OH), while partial U(VI) is reduced by Fe(II) in framework. This work not only highlights the facile strategy for enhanced U(VI) retention in highly acidic solution, but expands the potential application of supramolecular self-assembly material in treatment of nuclear wastewater.
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PubMed
高影响因子
Nano Research
·
2023
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IF 9.9
Sun Yaru,Yu Bin,Liu Yan,Yan Junbo,Xu Zixi,Cheng Bo,Huang Fenglei,Wang Jun
High-performance flame-retardant polylactic acid (PLA) bio-composites based on biobased fillers to meet usage requirements represents a promising direction for creating a sustainable world. Although flame retardant PLA composites have been reported extensively, it still remains a huge challenge to develop mechanically robust. The flame retardant PLA composites due to plastication effect of organic flame retardants and poor compatibility of organic fillers with the matrix lead to the severe deterioration in mechanical properties. In this work, a bio-inspired surface manipulation strategy for halloysite nanotubes (HNTs) was proposed via a facile and green self-assembly process. The structure and morphology of bio-inspired HNTs (b-HNTs) proved that biomass nanofillers (PA-NA-Fe) grew well both within the lumen and on the surface of HNTs. The growth of biomass on the inner and outer surfaces of HNTs was inspired from wooden towards enhancing the interface compatibility and imparting multi-properties to PLA biopolymer. Excellent mechanical properties (tensile, thermomechanical and anti-impact mechanical), great fire safety (heat release and smoke emission), thermostability and improved electromagnetic interference shielding effectiveness of this well-designed PLA nanocomposite were realized. The mechanisms of the enhanced performances of the PLA bio-composites by loading b-HNTs were proposed. This work presents a facile and environmentally-friendly bio-inspired modification strategy for HNTs to fabricate high-performance, multi-functional polymer composites, which is also suitable for surface modification of many other nanomaterials, including nanofibers, nanotubes, nanowires, and nanosheets.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2023
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IF 5.9
Ling Sun,Ziwei Wang,Lan Ding,Qiuyan Zhang,Di Li,Xiaohui Liu,Yuanlin Ren,Yuesheng Li
Herein, a multifunctional composite coating is constructed on silk fabrics by a facile impregnation strategy. In detail, the pre-period involves the aggregation growth of sophora flower extract/phytic acid-lanthanum ion-silk fibroin complex network, while the post-period introduces a water repellent layer that is composed of hydroxyl-terminated polydimethylsiloxane and hexadecyltrimethoxysilane composite. Benefiting from the synergistic effect of P, Si and N elements, the optimized finished silk sample denoted as D/FR/W R -SF exhibits a limiting oxygen index value of up to 29.3%, and shows a damage length as low as 9.4 cm in the vertical burning test. Since the sophora flower extract contains flavonoids such as rutin and quercetin , it confers good antibacterial activity and ultraviolet resistance to silk fabrics. The results display that D/FR/W R -SF inhibits the colony propagation of Escherichia coli and Staphylococcus aureus , and achieves an ultraviolet protection factor value of 38.61 compared with the control silk fabrics. Attributed to the directional arrangement of long-chain alkane and Si-CH 3 , D/FR/W R -SF exhibits good water repellency with a water contact angle of 138°. Additionally, D/FR/W R -SF also presents satisfactory washing resistance (integrated properties after 25 laundering cycles). Therefore, such a complete multifunctional composite coating scheme shows great potential for expanding advanced textile applications.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Shikun Hou,Ying Wang,Feng Gao,Hua Yang,Fei Jin,Li Ren,Qiong Wu,Hongliang Ge,Yahui Wang
This paper proposes a new and unprecedented strategy for designing efficient and ultra-light electromagnetic wave (EMW) absorbing materials. The strategy utilizes a nano-antenna arrays structure to capture EMW. Specifically, CoNi-layered double hydroxide (CoNi-LDH) nanoneedles are designed on the surface of carbon fiber cloth (CFC) using a solvothermal method, whereafter an in situ chemical oxidative polymerization process is employed to construct polyaniline (PANI) coating on these CoNi-LDH nanoneedles. The resultant composite, named PANI@CoNi-LDH@CFC, possesses the unique shell-core PANI@CoNi-LDH nano-antenna arrays and thus exhibits enhanced EMW absorption performance. The PANI@CoNi-LDH@CFC composite obtains an effective absorption bandwidth of 14.8 GHz (1.0–5.0 mm) and a minimum reflection loss of −57.6 dB. In particular, computer simulation technology confirms that the radar cross section values of PANI@CoNi-LDH@CFC are lower than −16.4 dBm 2 in the range of −60°<θ < 60°, indicating a high radar wave attenuation ability. This work pioneers the research on design of nano-antenna arrays structure to strengthen EMW capture and opens up a unique path for constructing high-performance EMW absorbing materials.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 31
·14819-14827
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IF 3.3
Zijian Wang,Yuyao Wang,Zhengyu Pan,Guoquan Zhou,Lele Yan,Lina Zhu,Zheng Fang,Tongyang Song,Xianlang Chen,Rongrong Li
The selective hydrogenation of benzoic acid (BA) under mild conditions has great significance in industrial applications. In this study, Ru catalysts supported on P and N-doped mesoporous carbons (PPNCs) were prepared and tested for the selective hydrogenation of BA. Among all the catalysts, Ru/PPNC-2 exhibited superior conversion (99.46%) and selectivity (99.95%), maintaining a high yield and good stability even after seven repeated tests. The experimental results show that the introduction of an appropriate amount of P into the catalyst forms an enhanced synergistic effect with N, so that the ruthenium nanoparticles (Ru NPs) are uniformly dispersed on the support and have a strong interactive force with the support to obtain more active sites, thereby promoting the catalyst activity and stability. This study provides an idea for the study of BA catalytic hydrogenation catalysts.
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ACS Catalysis
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2023
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IF 12.9
Xugang Yang,Zaihao Yuan,Minghao Zhou,Feng Chen,Bo-Qing Xu,Hui Shi
Lewis acidic heterogeneous catalysts are known to be active for transfer hydrogenation of carbonyl compounds, which occur naturally or can be derived from renewable feedstocks. While previous studies have explored a myriad of Zr-based catalytic systems toward the Meerwein–Pondorf–Verley (MPV) reductions, few have determined intrinsic, site-specific rates under strict kinetic control across a sufficiently wide range of process conditions, causing misconceptions about the true potentials of these catalysts for the targeted transformations. Here, we present a quantitative assessment on the intrinsic activities of four types of Zr catalysts that are purportedly promising candidates for the MPV reductions; the selected catalysts contain active Zr sites within diversified local coordination and secondary solvating environments. A comprehensive kinetic study of ethyl levulinate (EL) MPV reduction in 2-butanol, combined with in situ quantitative titration of the active sites by selective poisoning with alkylphosphonic acid titrants of Lewis acid sites during the reaction, reveals dramatic differences in the relative fraction of active sites (13–78% of total Zr) and turnover rates (>300-fold) among the studied catalysts. Mechanistically, the hydride shift invariably remains as the sole rate-limiting step, regardless of the catalyst; the free energy barriers in both first-order and zero-order kinetic regimes and kinetic isotope effects, however, differ significantly among the catalysts. Through mechanism-based rate equations and transition-state-theory treatments, we further delineate that the wide variations in enthalpic and entropic components not only suggest disparate transition state structures and energetics but also reflect varying adsorption thermodynamics that are influenced by both reactant coordination at and solvent restructuring near the active sites.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Hao Lei,Ning Pan,Hao Zou,Xiaoqiang Wang,Xianguo Tuo
Efficient removing uranium (U(VI)) from highly acidic environment remain a great challenge for the adsorbent. Herein, a novel hollow phytic acid-based hybrid material (P(Cr)E-7) was synthesized by a mild facile one-pot self-assembly method without template choosing Cr 3+ , phytic acid (PA) and ethylenediamine (EDA) as the inorganic and two organic building blocks. P(Cr)E-7 was employed for U(VI) capture in highly acidic wastewater. Thanks to the flexible segment assembled from EDA and PA, and the strong affinity of PA to U(VI), the maximum adsorption capacity of P(Cr)E-7 for U(VI) reached 282.8 mg/g under the condition of pH = 1.0 in static adsorption experiment. Simultaneously, P(Cr)E-7 showed the selectivity efficiency of almost 100 % for An-Ln and pH-dependent selectivity efficiency of 60 % for U(VI) in multi-ions solution with pH = 1.0. Moreover, P(Cr)E-7 showed excellent stability in 0.1 M HNO 3 and reusability after three cycles at pH = 1.0 benefiting from stable segment from coordination of Cr(III) and PA. Additionally, the SEM, XRD , FTIR, and XPS analysis revealed the adsorption mechanism that U(VI) exchanges with positively charged EDA + /EDA 2+ in P(Cr)E-7 to obtain preferred coordination geometry and ligand environment and further coordinates with P-OH/P = O in PA. This study addresses the practical application of effective adsorption of uranium in highly acidic nuclear industrial wastewater and illustrated a novel material design strategy of adsorbents for uranium extraction.
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International Journal of Electrochemical Science
·
2023
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IF 1.5
Xiaoming Wang,Xingeng Li,Xuelei Tian,Kai Guo
Both the effect of forming conditions on corrosion resistance of phytic acid conversion coating on zinc in air and the influence of ambient factors (temperature and relative humidity) on service of conversion coating were studied by SEM, EDS, ACM and SKP. Zinc-graphite ACM sensors and zinc plates were treated with phytic acid solution at different processing time and pH values. The results showed that longer processing time and alkalinity phytic acid solution weaken the corrosion resistance of treated zinc. Self-assembled monolayer of zinc phytate provided the best protection. The corrosion resistance of conversion coating with phytic acid solution was reduced when the ambient temperature or relative humidity is high values, which due to the zinc phytate bond strength with zinc matrix and co-adoption water on it.
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高影响因子
Wood Material Science & Engineering
·
2023
·
IF 2.2
Longchao Ma,Yihan Zhao,Tao Zhang,Xinzhou Wang,Meiling Chen,Liang Chen,Yanjun Li
In this report, we present a simple and rapid method for fabricating a hydrophobic coating of Phytic Acid-based hybrid complexes on wood surfaces to enhance their properties. This hydrophobic coating's micro/nanoscale coarse structure is constructed from a PA-Fe3+ coordination complex, and its low surface energy is further modified by impregnation with octadecylamine. Polyethyleneimine serves as an intermediate layer, tightly binding the wood to the PA-Fe3+ coordination complex. We characterized the microstructure, chemical composition, water contact angle, and anti-mold properties of the wood samples using SEM-EDS, FTIR, water contact angle tests, and anti-fungal tests. Further, we assessed the hydrophobic coating's chemical and environmental durability, contamination resistance, self-cleaning properties, and mechanical stability on composite wood. SEM-EDS and FT-IR mapping results confirmed that the PEI and PA-Fe3+ coordination complex were successfully coated on the wood surface, with long-chain octadecylamine grafted onto the complex particles. The composite wood with a 3-layer hydrophobic coating demonstrated superior surface properties, including a water contact angle of 145°, excellent chemical and environmental durability, contamination resistance, self-cleaning properties, and mechanical stability. Notably, it also exhibited superior anti-mold properties compared to the control.
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高影响因子
ChemElectroChem
·
2023
·Vol. 10
·期 18
·e202300255
·
IF 4
Jia Shen,Yating Zhu,Fengmei Zhou,Luyu Wang,Manli Guo,Yujuan Cao
Graphical Phosphorus-doped porous carbon coated graphite felt (P-GF) : It exhibited excellent hydrophilicity and infiltrating property, and it enhanced electrochemical reduction of O 2 and could significantly enhance the yield of H 2 O 2 . About 98.5 % of methylparaben could be degraded within 180 min, and four parabens could be simultaneously removed. The P-GF exhibited outstanding reusability. Pharmaceuticals and personal care products (PPCPs) are currently drawing significant attention due to their environmental impact. Electro-Fenton, one of the advanced oxidation processes (AOPs), is an efficient and comprehensive technology to degrade all kinds of organic pollutants, but the degradation efficiency relies on cathode material. In this work, phosphorus-doped porous carbon material coated graphite felt (P-GF) was prepared by adopting phytic acid as a phosphorus source through high temperature solid-state method. The microstructure and the elements composition of this fabricated material were investigated by SEM, BET and XPS. With phosphorus doping and plenty of carbon porous structures, the hydrophilicity and infiltrating property of the P-GF had been greatly improved. The prepared P-GF material enhanced the electrochemical reduction of O 2 and could significantly enhance the yield of H 2 O 2 . It was used as a cathode to degrade pollutants under a constant potential, and methylparaben (MePa) was chosen as a research model for optimizing the experimental conditions and analyzing the possible degradation pathway. The P-GF cathode achieved an excellent ability of degrading nearly 100 % of methylparaben within 3 h. The simultaneous removal ability of the P-GF to four parabens was impressed. Additionally, the P-GF material exhibited outstanding reusability.
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高影响因子
POLYMER DEGRADATION AND STABILITY
·
2023
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IF 5.9
Xiaokun Han,Tianyun Lu,He Wang,Zuocai Zhang,Shaorong Lu
Currently, interest in the development of a new sustainable sensors that does not cause pollution and exhibits rapid response for fire is increasing. Herein, a highly sensitive, flame-retardant, degradable film sensor (SCGP films) is developed by using a green and non-toxic scheme, which is comprising soybean protein isolate, chitosan, graphene, iron ions (Fe 3+ ), and phytic acid. The films exhibited reversible temperature response/recovery times (i.e., 2.6 s / 4.3 s) in wide range of 68.1–194.3 °C. The SCGP films showed a fast response time (3 s) to fire, and a continuous alarm during the long-term combustion (145 s). Moreover, the films can keep the structure intact after immersion in water for 30 days or under ultrasonic treatment. Therefore, the SCGP films can be assembled into a multifunctional sensor system which provides an eco-friendly scheme for multi-functional film sensor that can be applied in the fields of fire safety.
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高影响因子
危险品化学品经营许可证（带存储）