PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Chao Yan,Yiqun Fang,Ruofan Yang,Mengfan Yan,Weihong Wang,Yongming Song,Qingwen Wang
A novel organic-inorganic hybrid ceramicizable intumescent coating was developed for enhancing the fire safety of wood. Firstly, an amino resin modified with allyl glycidyl ether (PMFG) was reacted with tannic acid (TA) and phytic acid (PA) to prepare a nitrogen and phosphorus containing organic coating resin (PTP). Simultaneously, glass powders (GPs) or silica (SiO 2 ) were incorporated to form an organic-inorganic hybrid coating, which was then applied to the surface of wood in a specific sequence. When exposed to flames, the coating forms a lava-like ceramic char layer, providing effective protection for wood against flame damage. The results of the fire performance tests showed that the coated wood had excellent fire retardancy (LOI = 49.8) and that the total heat release (THR), total smoke production (TSP) and carbon monoxide production rate (P co ) of the optimal coating were reduced by 78.77 %, 78.88 % and 41.67 % compared to the pure PTP coating. This research provides a cost-effective solution for improving the fire safety of wood in modern construction.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wei Cai,Bicheng Lin,Liangyuan Qi,Tianyang Cui,Zhaoxin Li,Junling Wang,Sicheng Li,Chengfei Cao,Mohammad Ziaur Rahman,Xin Hu,Rujun Yu,Shuo Shi,Weiyi Xing,Yuan Hu,Jixin Zhu,Bin Fei
Even though significant advantages in the energy-free regulation of temperature are presented, the practical applications of radiative cooling materials in buildings and human surfaces still involve many safety issues, especially for fire hazards of polymer-based materials. Meanwhile, renewable and environmentally friendly materials are urgently needed to develop suitable radiative cooling materials with no adverse environmental impact. Herein, a chitosan-derived composite aerogel film with high solar reflection provided by the addition of melamine-phytic acid (MA/PA) hybrids is designed and prepared, presenting radiative cooling and fireproof performances. The instinct deep-yellow color of chitosan (CS) is successfully shielded by high-reflective MA/PA hybrids, while IR emissivity of up to 90.4 % and solar reflectivity of ∼ 89.3 % are achieved. In outdoor environments, this composite aerogel shows sub-ambient temperature drops of ∼ 4.3 °C and ∼ 3.1 °C in cloudless and cloudy weather, presenting a robust cooling effect. In addition, CS-MA/PA composite aerogel film with 3 mm thickness can isolate the fire of ∼ 500 °C, showing superior fire safety attributed to the synergistic flame retardant effects among chitosan, phytic acid, and melamine, which suppress the initial growth of fire and promote the rapid formation of protective char layer. This work provides a bio-based, fire-safe, and radiative cooling material to decrease the energy consumption of temperature regulation with a more environmentally friendly and safer approach, further promoting the practical application of radiative cooling materials.
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Journal of Cleaner Production
·
2024
·
IF 9.7
Feiyang Cheng,Xiangfeng Zhu,Bokun Lin,Chen Shi,Jian Han
The utilization of polyvinyl chloride (PVC) coatings is pervasive across numerous industries and market applications. However, due to its highly flammable nature, PVC coatings generate a large amount of toxic smoke when burning. We developed a bio-derived flame retardant and smoke suppressant, PASn@BiOCl, utilizing interface assembly technology. Compared to pure PVC coating, the addition of only 15 phr BiOCl@PASn significantly enhanced its various properties. The limiting oxygen index of PVC coating improved from 23.4% to 29.2%. Additionally, the UL-94 vertical burning test rating of the PVC coating has been improved from NR (No Rating) to V-0. More importantly, the peak heat release rate and peak smoke production rate of the PVC coating decreased by 70.7% and 60.7%, respectively, demonstrating the effective suppression of combustion and smoke generation. We also analyzed the pyrolysis products at different temperatures and the combustion behavior at various stages using Py-GC/MS and TG-IR techniques. It was observed that the char layer generated by PVC/BiOCl@PASn exhibited greater stability and density. The decomposition products including bismuth oxides, tin oxides, and phosphorus oxides formed a stable insulating layer on the charcoal surface, which effectively acted as a cohesive phase flame retardant. This highly efficient flame retardant and smoke suppressant PVC coating has enormous application potential in the fields of building materials, automobiles, textiles, and electrics.
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CELLULOSE
·
2024
·
IF 4.9
Bao Qiuru,Tian Yuyu,Xu Wen-Cong,Wu Juying,Zhang Kai
In response to the growing demands for cotton fabric across different applications, the development of multifunctional fabric has garnered significant attention. However, it is still a great challenge to simultaneously realize functions such as flame retardancy, washing durability and water repellency of fabric. In this work, an eco-friendly multifunctional cotton fabric (CF-PZF/PDMS) with durable flame retardancy and superhydrophobicity was successfully prepared through nanotechnology and surface modification methods, which included the impregnation with phytic acid (PA), in-situ growth of zeolitic imidazolate framework-8 (ZIF-8) and spraying of polydimethylsiloxane (PDMS). Due to the synergistic effect of nitrogen, phosphorus and silicon elements, as well as the catalytic charring effect of transition metal (Zn 2+ ) in ZIF-8 nanoparticles, CF-PZF/PDMS fabric had excellent flame retardancy and washing durability, with a limiting oxygen index (LOI) of 34.5% and a char length of 38 mm. Even after 20 washing cycles, CF-PZF/PDMS fabric still maintained an LOI value of 29.6%, exhibiting great self-extinguishing. Furthermore, the rough structure with hierarchical micro/nano-scale protuberances constructed by ZIF-8 and low surface energy of PDMS endowed CF-PZF/PDMS fabric with excellent superhydrophobicity and self-cleaning properties, evidenced by a water contact angle (WCA) of 152.8°. Notably, this fabric possessed excellent selective oil absorption capacity, high efficiency (more than 97%) in separating various oil–water mixtures, as well as superior stability in repetitive use. This study presents a straightforward method for fabricating multifunctional cotton fabric, which has promising applications in the field of advanced functional textiles and oil–water separation. Graphical abstract
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Guipeng Quan,Yunhuan Wu,Bao Gong,Xudong Liu,Yujie Liu,Wenhua Wang,Yuhui Ao,Linghan Xiao,Yujing Liu
Inspired by organic–inorganic soft and hard components found in mollusk shells, this study utilized phytic acid (PA) and MXene (Ti 3 C 2 ) to create “soft-hard” structure on the surface of carbon fiber (CF) through the bio-interfacial cross-linking reinforcement (BICR) strategy. This strategy not only increased the chemical reaction activity on the fibre surface, but also enlarged the interphase area of the fibres, which facilitated the formation of a strong physical riveting interaction among the fibres and substrate. Compared with the untreated CF composites, the flexural strength, flexural modulus, interlaminar shear strength (ILSS), tensile strength and interfacial shear strength (IFSS) of the CF/PEI/PA/MXene composites were increased by 51.4%, 62.5%, 63.0%, 74.9%, and 45.8%, respectively. These positive results were attributed to the large number of reactive functional groups on the PA myo-inositol ring, which increased the chemical reactivity of the fiber surface. Additionally, the MXene assembled on the fibre surface enhanced the adhesion and mechanical interlocking between the fibre and resin. This work provides an advanced route to fabricate CF composites with excellent mechanical properties.
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高影响因子
Biochar
·
2024
·Vol. 6
·期 1
·1-14
·
IF 13.1
Chen Shanshuai,Tian Liu,Feng Xiaoqiang,Bao Huanyu,Wang Hongliang
Chitin and phytic acid are abundant sustainable resources commonly found in shrimp shells, crab shells, and various plants. However, they are underutilized, and their biomass value is frequently underestimated. To address this, the current study developed a strategy to synthesize efficient separator coatings for zinc-iodine (Zn-I) batteries using chitin and phytic acid as carbon sources (biochar). First, nanosheets of porous carbon doped with N and P (NP-PC), featuring multiple active sites, are synthesized through in situ carbonization of chitin and phytic acid. Subsequently, the synthesized materials are coated onto the surfaces of glass fiber (GF) separators, effectively addressing several persistent challenges associated with Zn-I batteries. Notably, the modified separator (NP-PC@GF) enhanced the rapid-discharge capability of the involved battery, effectively inhibited the diffusion of intermediate polyiodide species, stabilized the electrolyte interface, suppressed irreversible dendrite formation, and increased I utilization efficiency. Consequently, the battery demonstrated high electrochemical performance, with an initial capacity of 7.8 mAh cm –2 at 20 mA cm –2 , an initial specific capacity of 8.9 mAh cm –2 under high I loading, and a retention rate of 56% (5.1 mAh cm –2 ) at the 174th cycle. Overall, this research demonstrates the effective use of biochar for separator modification, facilitating the development of high-performance Zn-I batteries. Graphical
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Dilihumaer Taxi,Shujuan Shao,Xieraili Maimaitiyiming,Amatjan Sawut,Mamutjan Tursun,Zaituniguli Kuerban,He Lin
Oxygen reduction reaction (ORR), as an important reaction carried out on the cathode of direct methanol fuel cells (DMFC), directly affects the performance of the cell. Previous experimental studies have shown that there are some interactions between the defect structure and N doping to promote the ORR performance of the catalysts. In this work, the binder was first utilized to reduce the lignin content in the cotton straw (CS) system, thereby increasing the defective structure of the carbon substrate. Here, we obtained 5C-NP-Fe catalysts by increasing the defectivity of the carbon substrate through binder. The coordination environment surrounding the Fe-N 4 sites is optimized by the synergistic action of the N and P atoms and the faulty structure, as shown by DFT theoretical calculations. In alkaline medium, half-wave potentials as high as 0.88 V in the three-electrode system and a peak power density of 10.8 mW cm −2 in a direct methanol fuel cell at 60℃. Compared to a 20 wt% commercial Pt/C catalyst (0.84 V, 7.5 mW cm −2 ), 5C-NP-Fe showed good ORR activity. The binder modification strategy provides a simple and green approach to the structural optimization of biomass-based catalysts.
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Journal of Materials Chemistry A
·
2025
·Vol. 13
·期 9
·6836-6846
·
IF 9.5
Yongmei Sun,Qingwen Fan,Chaoyun Song,Hailin Cong,Sanwei Hao,Mei Ma,Peng Fu
A conversion-alloy type anode, Sn2P2O7, is a promising candidate for sodium-ion capacitors (SICs) due to its high theoretical capacity, low cost, and nontoxic nature, but suffers from poor conductivity and large volume expansion. Herein, we propose a mild self-assembly strategy that achieves Sn2P2O7 confined by reduced graphene oxide (rGO) as an anode for sodium storage, thereby yielding an impressive specific capacity of 433.3 mA h g−1 at 0.1 A g−1 and exceptional rate capability of 185.7 mA h g−1 at a high current density of 10 A g−1. Notably, ex situ TEM reveals the underlying evolution that Sn2P2O7 particles are pulverized into nanodots with stable size as the cycle progresses and the rGO continuously sustains the electron conduction of Sn2P2O7 nanodots after long-term cycling. Quantitative kinetic analysis quantitatively deciphers the dominant role of pseudocapacitance in the sodium storage process. Meanwhile, density functional theory calculations indicate that the interfacial binding between rGO and Sn2P2O7 is dramatically conducive to accelerating electron transfer. The assembled Sn2P2O7/rGO//AC SIC delivers a superior gravimetric energy/power density of 158.3 W h kg−1/2523.3 W kg−1. This work provides a foundation for the structural design of high-rate and long-life tin-based composite oxide anodes.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Min Yin,Chaohu Xiao,Yang Jin,Yanyu He,Yuhan Zhang,Lihua Chen
Solar-driven interfacial evaporation plays an essential part in the production of potable water. Nevertheless, the intricate water conditions in real-world scenarios continue to pose limitations on its utilization. This study prepared a novel bionic PPy/BiVO 4 -PI/MXene aerogel composite material with radial center structure through directional freezing as the evaporator, which integrates both photothermal and photocatalytic properties into the evaporation system. In order to evaluate the efficacy of photocatalytic degradation and salt collection during interfacial evaporation, high-concentration saline water, simulated seawater and dyeing wastewater were employed as substitutes for real contaminated water bodies. After being exposed to 1 kW/m −2 (−|-) of irradiation, the PPy/BiVO 4 -PI/MXene composite exhibits an evaporation rate of 1.64 kg m -2 h −1 and achieves a photothermal efficiency of 96.77 %. In high-concentration saltwater containing 20 wt% NaCl, the PPy/BiVO 4 -PI/MXene exhibited an evaporation rate of 1.32 kg m -2 h −1 and a photothermal conversion efficiency of 77.41 %. Furthermore, approximately 26.7 g of salt can be collected after 15 days’ continuous evaporation. Furthermore, the PPy/BiVO 4 -PI/MXene demonstrated exceptional photocatalytic capabilities to organic dyes such as MB, RhB, CR and MG with removal efficiencies of 79.28 %, 70.96 %, 76.70 % and 80.95 %, respectively. This study realizes the synergistic effect of interfacial evaporation, photocatalysis and salt collection, providing a highly promising choice for the treatment of high-salt dyeing wastewaters.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Chao Ling,Wen Zhang,Zhengzhou Wang
The preparation of biomass flame retardants with efficient flame-retardant properties is conducive to the realization of sustainable development and is of great practical significance. In this work, a green and sustainable biomass flame retardant PATAPEI was prepared by using phytic acid (PA), tannic acid (TA), and polyethyleneimine (PEI) as reactants via a one-step method to develop biomass flame retardants that can synchronize enhanced flame retardation, smoke suppression, and mechanical performance of epoxy resin (EP). The EP with only a 3% PATAPEI (EP/3PTP) has a LOI value of 28.5% with a UL-94 V-0 classification. The peak heat release rate (PHRR), total heat release (THR), and total smoke release (TSR) of EP/3PTP were decreased by 29.72%, 25.80%, and 21.16%, respectively, in comparison with the ones of pure EP. Additionally, the tensile and impact strengths of EP/3PTP are higher than the ones of pure EP. PATAPEI on heating decomposes to produce phosphorus-containing acids and biphenyltriol-containing compounds, which promote to form a good char layer with the aromatic structures during the combustion of EP/3PTP. Therefore, PATAPEI has prospects of wide application in the development of sustainable biomass flame retardant EP.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Wangping Qin,Ruike Zhang,Yan Fu,Jie Chang
PTDF is prepared by a convenient ionic reaction of phytic acid, terephthalic dihydrazide and iron salts in water. It is a new type of high efficiency flame retardant. PTDF has high phosphorus and nitrogen content and good thermal stability, which can effectively improve the flame retardancy of PLA. PTFE is an anti-drip agent and is often used to improve the flame retardancy of PLA together with flame retardants. The addition of 4 wt% PTDF and 0.1 wt% PTFE made PLA reach V-0 flame retardant grade from non-flame retardant, and the oxygen index increased from 19.5 % to 24.5 %. With the increase of PTDF content, the performance of PLA improved significantly. The peak heat release rate (PHRR) and THR of PLA/6PTDF composites decrease by 27.4 % and 16.2 %, respectively, and the flame retardant index FRI increase by 232 %, showing excellent flame retardant efficiency. 6 wt% PTDF can increase the crystallinity of PLA by 25.9 %, tensile strength, maximum force required for impact fracture and notch impact strength by 12 %, 37 % and 129 %, respectively, and effectively improve the mechanical properties and toughness of the composite. The bio-based flame-retardant PLA/PTDF composites reported in this paper can be applied to office equipment.
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PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 10
·6627-6641
·
IF 3.9
Zhikun Lv,Zhaoyang Wang,Huaiguang Wang,Jianbin Li,Kai Li
Factory and natural wastewaters contain a wide range of organic pollutants. Therefore, multifunctional adsorbents must be developed that can purify wastewater. Phytic acid-cross-linked Baker's yeast cyclodextrin polymer composites (IBY-PA-CDP) were prepared using a one-pot method. IBY-PA-CDP was used to adsorb methylene blue (MB), bisphenol A (BPA), and methyl orange (MO). Studies on the ionic strength and strongly acidic ion salts confirmed that IBY-PA-CDP adsorbs MO through hydrophobic interactions. This also shows that Na+ was the direct cause of the increased MO removal. Adsorption studies on binary systems showed that MB/MO inhibited the adsorption of BPA by IBY-PA-CDP. The presence of MB increased the removal rate of MO by IBY-PA-CDP due to the bridging effect. The Langmuir isotherm model calculated the maximum adsorption capacities for MB and BPA to be 630.96 and 83.31 mg g−1, respectively. However, the Freundlich model is more suitable for fitting the experimental data for MO adsorption. To understand the rate-limiting stage of adsorption, a mass-transfer mechanism model was employed. The fitting results show that adsorption onto the active sites is the rate-determining step. After five regeneration cycles, IBY-PA-CDP could be reused with good stability and recyclability.
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高影响因子
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