SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Mimi Han,Wenhao Shen,Xin Tong,Jean-Pierre Corriou
Two-dimensional (2D) MXene provides large surface area for the adsorption and interaction of H 2 O molecules, which is highly desirable for the construction of humidity-sensing materials. However, the drawbacks, involving easy stacking and poor mechanical strength, pose a huge challenge to its practical application. Herein, inspired by nacred “brick-mortar” nanostructure , a nanopaper humidity sensor made of flexible TEMPO-oxidated cellulose nanofibers/MXene/silver nanowires (TOCNFs/MXene/AgNWs) was developed by vacuum-assisted filtration self-assembly strategy. The synergism of 1D TOCNFs, AgNWs “mortar” and 2D MXene “bricks” endows the nanopaper with superb tensile strength (146.3 MPa), modulus (16.9 GPa), and superior bending durability, and the obtained TOCNFs/MXene/AgNWs nanopaper humidity sensor exhibits high response value of 90% at 97% RH with a low MXene addition of 20 wt%. Furthermore, the unique photothermal response property of MXene accelerates the desorption of H 2 O molecules during sensor recovery, realizing the reversible sensing performance. The proposed humidity sensing mechanism lies in the variation of MXene interlayer d-spacing induced by adsorbing ambient H 2 O molecules and the swelling of TOCNFs. Lastly, the sensor demonstrates the possibilities in human respiration monitoring, non-contact sensing, and humidity actuating.
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ACS Applied Materials & Interfaces
·
2024
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IF 8.3
Zehui Su,Ting Du,Jianxing Feng,Jianlong Wang,Wentao Zhang
Nanozyme has been proven to be an attractive and promising candidate to alleviate the current pressing medical problems. However, the unknown clinical safety and limited function beyond the catalysis of the most reported nanozymes cannot promise an ideal therapeutic outcome in further clinical application. Herein, we find that ferric maltol (FM), a clinically approved iron supplement synthesized through a facile scalable method, exhibits excellent peroxidase-like activity than natural horseradish peroxidase-like (HRP) and commonly reported Fe-based nanozymes, and also shows high antibacterial performance for methicillin-resistant Staphylococcus aureus (MRSA) elimination (100%) and wound disinfection. In addition, with added effects inherited from contained maltol, FM can accelerate skin barrier recovery. Therefore, the exploration of FM as a safe and desired nanozyme provides a timely alternative to current antibiotic therapy against drug-resistant bacteria.
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PubMed
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Arabian Journal of Chemistry
·
2024
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IF 5.3
Jin Liu,Qian Zhong,Yanjin Wang,Zezhi Zhang,Huiqin Zheng,Bin Yan,Yurong Shi
Designing photocatalysts with p-n heterojunction structures is an effective way to boost the separation of photogenerated carriers and stimulate the photocatalytic degradation activity. Herein, an efficient visible-light responsive AgI/BiSI p-n heterojunction photocatalyst was successfully constructed. X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy, and electrochemical measurements confirmed that the AgI/BiSI p-n heterojunction structure was beneficial to the separation and transfer of photogenerated carriers, promoting the generation of main active species (•O 2 − and h + ). Furthermore, the photocatalytic degradation rate constants of Acid Red 1 (0.4699 min −1 ) and metronidazole (0.0730 min −1 ) over the optimal AgI/BiSI were about 8.4 and 3.0 times higher than those over pure AgI, respectively. This work provides a heterojunction engineering strategy to design high-efficient photocatalysts for the degradation of refractory organic pollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Jing Liu,Huiyu Dong,Carmen Sans,Xiangjuan Yuan
In this study, a series of boron (B) and oxygen (O) dual doped g-C 3 N 4 (BOCNx) composites with different boric acid dopant dosages were successfully synthesized through one-step thermal condensation method. Amongst, BOCN50 exhibited the best catalytic ozonation activity, achieving 97 % of iopamidol (IPM) degradation within 15 min and the highest k value (0.3166 min −1 ), which was 8 times higher than that of ozonation alone. Multiple characteristic techniques were used to explore the surface properties of BOCNx catalysts and it was found that B and O primarily coordinated in g-C 3 N 4 as the forms of C-O, C = O and B-N bonds. Further investigation in the structure–activity relationship of BOCNx catalyst indicated that the increasing contents of oxygen-containing functional groups and B-N bonds were linearly correlated with the IPM degradation rate. The results of scavenger experiments and ESR analysis demonstrated that the main reactive oxygen species involved were hydroxyl radicals, superoxide radicals, and singlet oxygen ( • OH, • O 2 − and 1 O 2 ). Additionally, up to 12 intermediate products of IPM during the reaction were detected, and the corresponding degradation pathways were elucidated. Finally, the structure of BOCN and the active sites for O 3 adsorption were determined by density functional theory (DFT) calculation, thus providing theoretical support for studying the mechanism of catalytic ozonation degradation.
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CARBOHYDRATE POLYMERS
·
2025
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IF 12.5
Lu Shen,Yinfu Luo,Long Ni,Mei Liang,Shengtai Zhou,Huawei Zou
It is a great challenge to prepare lightweight porous materials with high-efficiency broadband sound absorption and good mechanical properties. In this work, a series of melamine foams (MF) which were decorated by silver (Ag) and cellulose nanofiber (CNF) were prepared by the in-situ deposition and freeze-drying method. The deposition of Ag particles on the foam skeleton formed nanopores, and hierarchical porous structures were constructed along with the existence of micropores in MF. In addition, the formation of filamentous CNF structure further optimized the pore structure, which resulted in achieving excellent broadband sound absorption and enhanced mechanical properties of corresponding composite foams. Specifically, Ag@MF-6-CNF achieved more than 95 % sound absorption efficiency in the range of 2500–6400 Hz. Besides, the compressive strength of Ag@MF-6-CNF reached 13.8 kPa at a strain rate of 50 %, which was 75 % higher than pure MF. The proposed method provided a reference for preparing lightweight porous materials for noise attenuation applications in industrial sectors.
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CARBOHYDRATE POLYMERS
·
2025
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IF 12.5
Hui Liu,Yi Lu,Bitao Peng,Jingxian Wei,Hongli Dai,Lei Wang,Hongxiang Zhu,Hui He
Materials capable of multiple encryption, color-changing visualizations, and time-dependent functionalities are ideal for efficient and secure information storage and transmission. In this study, a time-dependent self-erasing material (TDSEM) containing urease developed through the in-situ synthesis of gold nanoclusters on the surface of cellulose nanocrystal (CNC) chemically bonding fluorescein isothiocyanate. CNC not only played an important role as a long-term stabilizer for the material, but also acted as a bridge facilitating the assembly of organic and inorganic interfaces, enabling the integrated system to achieve multi-color regulation and fluorescence resonance energy transfer. The TDSEM demonstrated excellent pH responsiveness, cyclic stability, and durability. The information was encoded by directly introducing HCl/urea into the TDSEM, and automatically erased over time. Additionally, the fluorescence intensity and color (transitioning from red to orange to green) were modulated over a time scale by adjusting the urea concentration, thus precisely controlling the time to retrieve the correct information (22 min). The confidentiality of the encoded information was enhanced by dual “locking” of time and color, ensuring that decryption only occurred “time color key”. This time-dependent and color-varying dual functions provide valuable insights for the development of advanced information encryption and anti-counterfeiting technologies.
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RSC Advances
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2017
·Vol. 7
·期 69
·43512-43520
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IF 3.108
Yanyan Lv,Lei Li,Yi Zhou,Miao Yu,Jianquan Wang,Jianxin Liu,Jiagui Zhou,Zongqing Fan,Ziqiang Shao
As one of the energy storage devices, all-solid-state flexible supercapacitors have attracted significant attention because of their high power density, low cost, high safety, low environmental impact, and long cycle life. In this study, a new type of all-solid-state flexible supercapacitor that uses cellulose nanofibers (CNFs)/molybdenum disulfide (MoS2)/reduced graphene oxide (RGO) hybrid aerogel film as an electrode material and charge collector and H2SO4/polyvinyl alcohol (PVA) gel as an electrolyte and separator has been demonstrated. These aerogels are prepared by supercritical CO2 drying, which use CNFs as an effective, environmentally friendly, and steady dispersant of MoS2 and RGO. Owing to the porous structure of the electrodes and the remarkable electrolyte absorption properties, the supercapacitors exhibit excellent electrochemical properties. The specific capacitance calculated from the cyclic voltammogram curves at a scan rate of 2 mV s−1 is about 916.42 F g−1. The capacity retention is more than 98% after 5000 charge–discharge cycles at a current density of 0.5 mA cm−2. Additionally, the areal capacitance, areal power density, and energy density of the supercapacitors are about 458.2 mF cm−2, 8.56 mW cm−2 (4.3 kW kg−1), and 45.7 μW h cm−2 (22.8 W h kg−1), respectively. Owing to its low cost and environmental friendliness, CNFs/MoS2/RGO nanohybrid aerogel has great application potential as an electrode material of all-solid-state flexible supercapacitors.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Quan Chen,Hongjuan Feng,Jihong Dong,Yu Huang,Peng Yi,Min Wu,Bo Pan
Sorption and degradation occur simultaneously during the removal of aromatic organics by biochar. However, the unclear association between sorption and degradation limited our understanding of the underlying mechanisms of organic removal by biochars. Herein, the removal of monocyclic 2,6-dimethylphenol (DMP) and bicyclic bisphenol A (BPA) by raw and potassium hydroxide modified biochars was comparatively investigated by batch removal experiments and theoretical calculations. Under identical initial concentrations, biochar displayed lower sorption but higher degradation for DMP compared to BPA, whilst higher sorption corresponded to greater degradation for the same chemical. Sorption mechanisms revealed by molecular dynamic simulations include π-π, hydrophobic, and hydrogen bonding interactions. Density functional theory calculations identified the preferred degradation sites on biochar for adsorbed organics are graphitic nitrogen, defects, carboxyl, and hydroxyl functional groups. Analysis of free radicals and degradation intermediates concluded that the degradation pathways involve both free radical pathways and electron transfer processes for DMP, while only free radicals for BPA. Experimental and computational results indicated an increase in ring quantity can lead to higher sorption affinity but lower degradability of aromatic organics by biochar. Findings of this research provide theoretical support for the advancement of biochar based aromatic contaminant mitigation strategies.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Mei Lin,Miao Wang,Jianwang Wu,Ming Liu,Zuliang Chen
Since the widespread use of antibiotics, the residues of antibiotics have frequently been detected in various water sources, making antibiotic pollution an urgent environmental issue. In this paper, one-step green synthetic reduced graphene/manganese nanoparticles (rGO/Mn NPs) composites have been utilized as a novel environmentally-friendly catalyst for tetracycline (TC) removal. The results demonstrated that rGO/Mn NPs exhibit excellent adsorption performance for TC, and can efficiently activate sodium persulfate (PDS) to oxidize and degrade TC. Furthermore, the rGO/Mn NPs adsorption-oxidation system (85.2%) was more effective than the adsorption process (70.9%) in removing TC (50 mg L −1 ). Free radical quenching experiments and EPR results elucidated that singlet oxygen ( 1 O 2 ) and superoxide radicals (·O 2 − ) are the primary reactive species responsible for the degradation of TC in the oxidation system. Based on the characterization results, a mechanism of oxidative degradation of TC by rGO/Mn NPs has been proposed. To further elucidate the degradation pathway of TC, the degradation products were identified by high performance liquid chromatography-mass spectrometry (HPLC-MS). This analysis provides a foundation for understanding how the rGO/Mn NPs composites activate PDS to degrade TC. Additionally, the ecological structure-activity relationship analysis revealed that TC is converted into intermediates with lower toxicity.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chuanyu Chen,Simeng Xia,Fan Chen,Ting Peng,Lin Deng,Huiying Wu,Zhou Shi
The Fe(II)/peracetic acid (PAA) process shows significant potential for the removal of organic pollutants due to the rapid reaction between Fe(II) and PAA. However, the slow reduction from Fe(III) to Fe(II) leads to the continuous or excess dosing of Fe(II) during practical application. In this study, epigallocatechin gallate (EGCG), a typical reagent extracted from green tea, was used to enhance the degradation of coumarin (COU) by Fe(II)/PAA for the first time. A complete elimination of COU (25 μM) was achieved in the presence of 50 μM Fe(II), 300 μM PAA, and 25 μM EGCG, exhibiting a k obs value of 0.108 min −1 , which was 27 times higher than that observed with Fe(II)/PAA (0.004 min −1 ). Further, Fe(II)/EGCG/PAA demonstrated remarkable pH tolerance, with a COU removal efficiency exceeding 80 % across a pH range of 3–9. Mechanisms investigations revealed that •OH played a dominant role in COU degradation by Fe(II)/EGCG/PAA (accounting for 98.2 %). The increase in EGCG concentration from 10 to 100 μM resulted in a decreased formation of •OH yield and an enhanced generation of RO•. These findings highlight the capability of EGCG to improve the oxidation capacity of Fe(II)/PAA and modulate reactive species formation. The outstanding oxidation capacity and environmental friendliness of Fe(II)/EGCG/PAA process render it a potential strategy to eliminate organic pollutants in actual water treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yueqian Liu,Yu Rong,Yuanjin Zeng,Jiangkai Bao,Zhuqun Shi,Chuanxi Xiong,Quanling Yang
The TEMPO-oxidized cellulose nanofibril (TOCN) is a green, renewable, recycled material with high performance developing natural, environmentally friendly triboelectric materials. However, the performance of natural polymer triboelectric materials needs to be further improved. In this work, a novel high-performance TOCN-based triboelectric material was prepared and enhanced by increasing oxygen-rich groups and porous structure by regulated TEMPO-mediated oxidation and direct freeze-drying process. Oxygen-rich groups and porous structures synergistically boosted the surface charge density of the material during contact separation to enhance the triboelectric output performance. The open-circuit voltage of the triboelectric nanogenerator (TENG) was realized to be enhanced by 36 % and 84.5 %, respectively, with the power density up to 1.003 W/m 2 . Meanwhile, finite element analysis calculations further verified that the oxygen-rich groups help to increase the surface charge density of the material and make electron transfer easier. This study provides a new strategy for preparing high-performance, environmentally friendly, biocompatible biomass triboelectric materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Guodong Tian,Chao Duan,Shasha Che,Baoke Zhao,Bingxu Zhou,Yonghao Ni
Advanced oxidation processes have extensive applications in the degradation of organic pollutants in wastewater. However, conventional powder photochemical catalysts have limited utility due to their susceptibility to agglomeration, electron-hole recombination, and challenges in recycling. In this work, we herein propose an integration tactic to facilely fabricate a cellulose-based photocatalytic electrospun membrane (ZPP/CA-ENM) via synchronous electrospinning of acetate cellulose (CA) and electrospray of core-shell PMMA@PDA@ZIF-67 (ZPP) photocatalysts. This hybrid membrane is capable of synergistic PMS activation and photocatalytic degradation of tetracycline (TC) and methylene blue (MB). For the ZPP catalysts, the PDA@ZIF-67 heterojunctions greatly promote the adsorption of visible light and the separation of photogenerated electron-hole pairs, leading to excellent catalytic efficiency. The synchronous electrospinning and electrospray not only lead to the formation of porous and spiderweb-like membrane structure, but also facilitates the dispersion and recycling of these catalysts. Results reveal that under the presence of light irradiation and PMS, various oxidative species, including 1 O 2 , SO 4 − , OH and O 2 − are generated, resulting in rapid degradations of TC (93.31 % within 30 min) and MB (99.90 % within 15 min), which also exhibits a rapid degradation and high efficiency in a cascade continuous lab setup. This work provides a new strategy for exploring novel and efficient material for wastewater purification.
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