APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Yingqiao Zhou,Richard L. Smith,Xinhua Qi
Bifunctional catalysts synthesized from renewable materials for conversion of cellulose to platform chemicals are needed in biorefinery development. Herein, supramolecular assembly and crosslinking of chitosan by phytic acid was used to synthesize Ru-doped phosphorus- and nitrogen- carbon catalysts (Ru/PNC) for one-pot conversion of cellulose to sorbitol. Sorbitol yields as high as 78% were obtained from cellulose with the Ru/PNC catalyst in water at 200 °C and 4 MPa H 2 for 3 h. P content was found to have a linear relationship with the cellulose conversion and sorbitol yield within a certain range. The prepared catalyst exhibited good stability, and could be recycled for at least 5 times. Other cellulosic sources (cotton wool, filter paper) afforded sorbitol yields >60%, showing the potential of the catalyst for industrial production. This work demonstrates that supramolecular assembly and cross-linking can be used to design efficient, durable, and renewable bifunctional catalysts for biomass upgrading.
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Nature Sustainability
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2024
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IF 25.7
Liang Qirui,Huang Yanan,Guo Yaxin,Zhang Xin,Hu Xiaomeng,Zeng Hui,Liang Kang,Zhao Dongyuan,Jiang Lei,Kong Biao
Hydrogen, a clean energy carrier, has emerged as a promising solution to decarbonize the power sector and move towards a more sustainable future. However, the heavy dependence of its production on fossil fuels highlights the pressing need to prioritize the acquisition of green hydrogen from renewable sources, ideally without any additional energy input. Here we utilize the osmotic energy between seawater and freshwater to generate hydrogen directly. With a tandem of high-performance ion exchange membrane and electrocatalytic electrode, our design serves to harvest osmotic energy and drive hydrogen production. Notably, the integrated device demonstrates a consistent alkaline hydrogen evolution rate exceeding 300 l m −2 h −1 for more than 12 days under the artificial salinity gradient. Our study presents a viable pathway for hydrogen production through renewable sources.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2024
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IF 8.1
Chunlong Zuo,Li Wang,Xizhi Chen,Lina Jiang,Wei Tan,Lixiao Gao,Yongli Zhang,Yuanlin Ren,Xiaohui Liu
To fabricate polyacrylonitrile (PAN) composite fibers with superior flame retardancy, smoke suppression and enhanced mechanical properties, a novel water insoluble biomass-based flame retardant , TPPA@PAO, was synthesized, which was then blended with PAN spinning solution and Co 2+ solution was used as the coagulation bath to prepare modified PAN composite fibers (TPPA@PAO-Co/PAN). The elongation at break and tensile strength of TPPA@PAO-Co/PAN increased by 36.5 % and 45.4 % due to the formed three-dimensional cross-linked supramolecular network among TPPA@PAO, Co 2+ and PAN. Furthermore, the limiting oxygen index of TPPA@PAO-Co/PAN increased from 17.3 % of the control PAN to 33.7 %. The peak of heat release rate, total heat release, peak of smoke production rate, total smoke production and CO production rate were reduced by 78.1 %, 63.5 %, 81.1 %, 85.0 % and 73.1 %, respectively. The work developed a novel approach for fabricating PAN composite fibers with simultaneous flame retardant, smoke suppression and enhanced mechanical properties, expanding its application field.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Hanchen Wang,Lijia Jia,Biao Huang,Qi-Lin Lu
The construction of N, P co-doped hierarchically porous carbons (NPHPC) by a facile and green approach is crucial for high-performance energy storage but still an enormous challenge. Herein, an environment-friendly “ in-situ co-doping, self-regulation-activation” strategy is presented to one-pot synthesize NPHPC using a phytic acid-induced polyethyleneimine/chitosan gel (PEI-PA-CS) as single precursor. NPHPC displayed a specific surface area of up to 1494 m 2 g −1 , high specific capacitance of 449 F g −1 at 1 A g −1 , outstanding rate capability and cycling durability in a wide temperature range (−20 to 60 °C). NPHPC and PEI-PA-CS electrolyte assembled symmetric quasi-solid-state flexible supercapacitor presents superb energy outputs of 27.06 Wh kg −1 at power density of 225 W kg −1 . For capacitive deionization (CDI), NPHPC also exhibit an excellent salt adsorption capacity of 16.54 mg g −1 in 500 mg L −1 NaCl solution at a voltage of 1.4 V, and regeneration performance. This study provides a valuable reference for the rational design and synthesis of novel biomass-derived energy-storage materials by integrating phytic acid induced heteroatom doping and pore engineering.
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EUROPEAN POLYMER JOURNAL
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2024
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IF 5.8
Li Ma,Yadong Wang,Jingjing Gao,Zongmin Zhu
MXene is a promising flame retardant for composites. Currently, how to construct modified MXene nanomaterials with high flame-retardant efficiency is a challenge. In this work, a functionalized MXene-based flame retardant (MXene-AP-Cu) was synthesized by grafting phytic acid copper complex onto the surface of MXene, and was utilized to prepare high performance epoxy resin (EP) composites. Only 2 wt% MXene-AP-Cu increased limited oxygen index (LOI) of EP to 29.7% from 21%, with an enhancement of 41.4%. In addition, EP/2% MXene-AP-Cu presented excellent suppression effect on the release of heat, smoke and CO, as reflected by a 40%, 18%, 25.3% and 33.3% decreases in peak of heat release rate (PHRR), total heat release (THR), total smoke product (TSP) and peak of CO release rate, respectively, compared to EP. The multiple carbonization of MXene-AP-Cu, including lamellar barrier effect, catalytic carbonization of MXene and copper irons, dehydration and carbonization of phytic acid, contributed to better flame retardancy. Besides, the impact strength of EP/MXene-AP-Cu was increased to a certain extent, compared to EP.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Zimeng Kong,Yajun Chen,Tian Ye,Jinling Hao,Haoran Shi,Fenghao Hao,Ran Zheng,Lijun Qian
In this study, cellulose nanofibers (CNFs) were utilized as a synergistic agent, and combined with phytic acid arginine salt (PaArg) via blending and bonding. The effects of these different binding techniques of CNFs and PaArg on the flame retardant and mechanical properties of poly (butylene succinate) (PBS) were explored. The results indicated that both blended and bonded CNFs and PaArg enabled PBS composites to achieve a UL 94 V-0 rating, with the limiting oxygen index (LOI) value of the composite exceeding 28 %. When 20.5 % PaArg and 4.5 % CNFs were blended into PBS, the peak heat release rate (PHRR) of the composite decreased by 44.7 % compared to pure PBS. When the same content of hydrogen-bonded PaArg and CNFs(20.5PaArg-4.5CNFs) were added into PBS, the PHRR of the composite (PBS/20.5PaArg-4.5CNFs) reduced by 45.7 %. And it also exhibited a smaller fire growth index (FGI), enhancing the fire safety of the PBS composite. The incorporation of CNFs also improved the bending strength and impact strength of PBS. Specifically, the hydrogen bond between PaArg and CNFs demonstrated superior binding effects. Compared to the PBS/25PaArg composite, the bending strength and impact strength of the PBS/20.5PaArg-4.5CNFs composite were increased by 41.9 % and 82.1 %, respectively.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Huimin Wu,Fei Jin,Hong-Liang Ge,Qiong Wu,Ying Wang,Feng Gao
Real-time environmental and physiological humidity monitoring requires humidity sensors made of stable and reusable humidity-sensitive materials. Here, bacterial cellulose (BC) easily modified with phytic acid (PA) was shown to be useful for self-powered and impedance-based humidity sensors. Due to the strong covalent bonding between PA molecules and BC effectively enhancing water molecule adsorption and charge transfer, the modified self-powered humidity sensor exhibited high output voltage (0.53 V) and low hysteresis (ΔH = 2.8 %), whereas the impedance-based humidity sensor possessed a high response value (1831) and a fast response time (6.9 s). The sensor maintains excellent sensing performance after 50 cycles and even after immersion in various environments such as acids, alkalis, and salts. In addition, this synthetic material shows good application prospects in respiratory rate monitoring, non-contact measurement, and smart diaper humidity detection. Notably, the self-powered sensor incorporates advanced wireless transmission capabilities, thereby augmenting its portability and practicality.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Yapeng Zheng,Tianyang Cui,Jingwen Wang,Yuan Hu,Zhou Gui
Conductive hydrogels are pivotal for the advancement of flexible sensors, electronic skin, and healthcare monitoring systems , facilitating transformative innovations. However, issues such as inadequate intrinsic compatibility, mismatched mechanical properties, and limited stability curtail their potential, resulting in compromised device efficacy and performance degradation . In this research, we engineered functional hydrogels featuring a dual-crosslinked network composed of (PA/PVA)-P(AM-AA) to address these challenges. This design eliminates the need for conductive additives, thereby enhancing intrinsic compatibility. Notably, the hydrogels exhibit exceptional mechanical properties, with high tensile strength (∼700 %), Young's modulus (∼5.33 MPa), increased strength (∼2.46 MPa) and toughness (∼6.59 MJ m −3 ). They also achieve a compressive strength of ∼7.33 MPa at 80 % maximal compressive strain and maintain about 89 % transparency. Moreover, flexible sensors derived from these hydrogels demonstrate enhanced multimodal sensing capabilities, including temperature, strain, and pressure detection, enabling precise monitoring of human movements. The integration of multiple hydrogels into a three-dimensional sensor array facilitates detailed spatial pressure distribution mapping. By strategically applying dual-crosslinked network engineering and eliminating conductive additives, we have streamlined the design and manufacturing of hydrogels to meet the rising demand for high-performance wearable sensors .
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Rui Zhu,Peng Sun,Guofeng Cui,Jie Zhao,Yaoguang Yu
Ion transportation via the mixed mechanisms of hydrogels underpins ultrafast biological signal transmission in nature, and its application to the rapid and sensitive sensing detection of human specific ions is of great interest for the field of medical science. However, current research efforts are still unable to achieve transmission results that are comparable to those of bioelectric signals. Herein, 3D interconnected nanochannels based on poly(pyrrole-co-dopamine)/poly(vinyl alcohol) (P(Py-co-DA)/PVA) supernetwork conductive hydrogels are designed and fabricated as stimuli-responsive structures for K+ ions. Distinct from conventional configurations, which exhibit rapid electron transfer and permeability to biosubstrates, interconnected nanofluidic nanochannels collaborated with the P(Py-co-DA) conductive polymer in the supernetwork conductive hydrogel significantly improve conductivity (88.3 mS/cm), ion transport time (0.1 s), and ion sensitivity (74.6 mV/dec). The faster ion response time is attributed to the synergism of excellent conductivity originating from the P(Py-co-DA) polymer and the electronic effect in the interconnected nanofluidic channels. Furthermore, the supernetwork conductive hydrogel demonstrates K+ ion selectivity relative to other cations in biofluids such as Na+, Mg2+, and Ca2+. The DFT calculation indicates that the small solvation energy and low chemical transfer resistance are the main reasons for the excellent K+ ion selectivity. Finite element analysis (FEA) simulations further support these experimental results. Consequently, the P(Py-co-DA)/PVA supernetwork conductive hydrogels enriched with the 3D interconnected nanofluidic channels developed in this work possess excellent sensing of K+ ions. This strategy provides great insight into efficient ion sensing in traditional biomedical sensing that has not been explored by previous researchers.
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ACS Applied Polymer Materials
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2024
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IF 4.4
Jun Liao,Congcong Ding,Junping Shi,Liang Jiang,Qiuyi Wang,Lielin Wang
The application of chitosan-based materials for the separation of uranium from wastewater was limited due to the lack of active sites. In this work, a chitosan-based composite (CaCO3@aCS/PA) was effectively created by modifying chitosan with CaCO3 and phytic acid to enhance the adsorption performance of chitosan materials. CaCO3@aCS/PA showed no significant changes and no Ca2+ was detected in the solution after stirring for 10 h in a solution with pH > 3, indicating good stability of CaCO3@aCS/PA, which was beneficial for use in adsorption. Moreover, the adsorption capacity and adsorption percentage of CaCO3@aCS/PA for uranium reached 842.0 mg/g (298 K, pH = 4) and 95.4% (C0 = 10 mg/L, pH = 4) and the adsorption equilibrium time was significantly shortened, indicating that the modification with CaCO3 and phytic acid enhanced the adsorption ability of chitosan for uranium, which was related to the synergistic effect of various active sites (CO32–, PO43–, −OH, and –NH2) on CaCO3@aCS/PA for uranium adsorption.
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POLYMER DEGRADATION AND STABILITY
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2024
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IF 6.3
Jinghang Zhu,Yiqun Fang,Ruofan Yang,Yiqing Fu,Guoqing Li,Xiaoyan Bai,Weihong Wang,Yongming Song,Qingwen Wang
In this study, a fully bio-based intumescent flame retardant, phytic acid vanillin arginine salt (VR-PA), was designed and synthesized by l-arginine (AR) and vanillin (VA) via a Schiff base reaction, followed by the introduction of phytic acid (PA) using electrostatic ionic interactions. The intumescent flame retardant, VR-PA, was incorporated into wood flour polypropylene composites (WFPP) to enhance their flame retardant and smoke suppression properties. Compared to pure WF, the limiting oxygen index (LOI) of WFPP with 20 wt% VR-PA increased to 28.2 %, while the peak heat release rate and total heat release were reduced by 35.4 % and 20.6 %, respectively. Additionally, the WF with 15 wt% VR-PA exhibited the greatest reduction in total smoke production, with a significant decrease of 42.1 %. The improved flame retardant and smoke suppression performance of the WF is attributed to the free radical trapping effect of VR-PA in the gas phase during the combustion process, as well as the formation of an expanded and continuous carbon layer during in the condensed phase. This study provides a green method to enhance the flame retardancy and smoke suppression of WFPP composites.
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Kunpeng Song,Xue Bi,Chuang Yu,Ye-Tang Pan,Henri Vahabi,Vera Realinho,Jiyu He,Rongjie Yang
Up to now, metal–organic frameworks (MOFs) with open nanostructures have shown outstanding capabilities in trapping smoke particles compared to the original MOFs. However, only a few MOF-based strategies have been reported to synthesize hierarchical porous cages thus far, which are mainly restricted to environmentally unfriendly wet-chemical liquid methods. Herein, as a proof-of-concept, a gas-steamed metal–organic framework approach was designed to fabricate a series of cheeselike open cages with hierarchical porosity. Briefly, zeolitic imidazolate framework-67 (ZIF-67) and phytic acid were employed as precursor and etchant, respectively. Abandoning the conventional wet-chemical method, the coordination bond of ZIF-67 was cleaved by acidic steam, forming an open framework with a high specific surface area and a hierarchical porous structure. The universality of this method was also confirmed by the selection of different etchants. Impressively, they also show outstanding fume-toxic adsorption capability and labyrinth effects based on abundant and complex porous channels. At only 5 wt % loading, Co3O4@open ZIF-67 cage-2 (Co3O4@OZC-2) imparted polyurea (PUA) composites with a 21.2% limiting oxygen index, and the peak of heat release rate, total heat release, and total smoke production were reduced by around 37.5, 25.5, and 40.4%, respectively, compared to neat PUA. This work will shed light on the advanced structural design of polymer composites with high fire safety, especially smoke suppression performance, so as to obtain more feasible applications.
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