JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Xiaowei Liu,Konghu Tian,Zhihong Chen,Chao Zhang,Jing Wang,Jinbo Zhu,Sheng Sun,Lixin Xu
Melamine-derived carbon foam (MDCF) and nickel–cobalt bimetallic nanosheet arrays (NiCo-BNSA) possess unique porous structures and excellent microwave absorption (MA) properties, making them potentially useful in MA applications. In this investigation, we fabricated NiCo-BNSA/reduced graphene oxide/MDCF (NiCo-BNSA/RGO/MDCF) composites utilizing a two-stage synthesis protocol. This process incorporated melamine foam (MF) pretreatment, carbonization, and a subsequent in-situ growth stage, resulting in the creation of a three-dimensional porous network structure. By adjusting the RGO volume, we were able to manipulate the structure and composition of the NiCo-BNSA/RGO/MDCF composites, leading to an enhancement in their MA performance. It was also observed that the NiCo-BNSA was evenly distributed on the surface of both the RGO and MDCF . The composites exhibited an optimal reflection loss ( RL min ) of −67.8 dB at a thickness of 2.50 mm, and by varying their thickness, the effective absorption bandwidth (EAB, RL ≤ -10 dB) extended to 9.80 GHz, encompassing the entire C and X bands. This study presents a novel approach for fabricating lightweight and efficient carbon-based MA composites.
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Journal of Energy Storage
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2023
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IF 9.4
Haidong Xie,Chunping Hou,Yuqing Qu,Hui Tian,Hui Lu,Jiandong Wu,Shaolin Yang,Yong Ma
SiO x has become one of the most promising anode materials for lithium ion batteries due to its high specific capacity, abundant natural resources and suitable lithium insertion and extraction voltage. However, the low conductivity and the poor cycle performance seriously hinder its practical application. In here, a simple and effective method is proposed to disperse SiO x between carbon materials including flake graphite, reduced graphene oxide (rGO) and carbon nanotubes (CNTs), and then micron-sized N-SiO x /graphite/rGO-CNTs@C (N-SiO x /C@C) composite with dense structure is prepared by coating and pyrolysis of pitch. The synergistic effect of various carbon materials is beneficial to improve the conductivity of the material, and maintain the structural integrity during the cycle. The obtained N-SiO x /C@C anode exhibits high reversible capacity (980.2 mAh·g −1 ), excellent cycle stability (70 % capacity retention after 500 cycles at 0.5 A·g −1 ) and excellent rate performance (491.9 mAh·g −1 specific capacity of at 5 A·g −1 ). The strategy provided here effectively improves the electrochemical performances of SiO x , and the prepared materials show great application potential in the field of lithium ion batteries.
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Journal of Water Process Engineering
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2023
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IF 7
Fuwang Zhao,Yanling Yang,Siyang Ji,Rui Yu,Xing Li,Zhiwei Zhou
A photo-Fenton catalyst Fe‑carbon nitride (g-C3N4)/reduced graphene oxide (rGO) (labeled as FNGO) was prepared via two-step calcination thermal polymerization. rGO as a carrier of Fe-g-C3N4 accelerated the charge transfer and improved the reduction of Fe (III) as compared those of the binary Fe-g-C3N4 catalyst. The FNGO catalyst maintained a high surface area of 264.7 m2/g and its charge transfer rate was 2.77 times higher than Fe-g-C3N4. The decreasing transient photocurrent and increasing electrode resistance of FNGO, Fe-g-C3N4 and g-C3N4 confirm the positive synergistic effect of Fe N coordination and rGO in charge transfer. Under the synergistic of visible light irradiation and H2O2, the excellent degradation performance of FNGO towards rhodamine B was achieved (95.3 % removal) at Fe-doping content of 10 wt%, rGO loading content of 0.5 % and H2O2 addition of 1.5 mM. Hydroxyl radicals played a dominant role in the photocatalysis-Fenton system, which was related to the coordination of Fe N, the carrier off-domain of rGO, and the Fe (III)/Fe (II) cycle promoted by photogenerated electron and superoxide radicals. The FNGO had a high stability, a wide pH adaptation (3– 11) and a low Fe-leaching. This novel ternary light-driven photo-Fenton catalyst of FNGO enabled efficient decontamination during advanced treatment of wastewater.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Hafiz Muhammad Adeel Sharif,Muhammad Bilal Asif,Yuwei Wang,Ya-Nan Hou,Bo Yang,Xu Xiao,Changping Li
Iron (Fe)-based catalysts are widely used for taming nitrogen oxides (NO x ) containing flue gas , but the regeneration and long-term reusability remains a concern. The reusability can be acquired by external additives, and resultantly can not only increase the cost but can also add to process complexity as well as secondary pollutants. Herein, a self-sustainable material is designed to regenerate the catalyst for long-term reusability without adding to process complexity. The catalyst is based on reduced graphene-oxide impregnated by Fe 2 O 3 -MnO (rGO@Fe 2 O 3 -MnO; G-F-M) for spontaneous intra electron (e - )-transfer from Mn to Fe. The developed catalyst; G-M-F exhibited 93.7% NO x reduction, which suggests its high catalytic activity . The morphological and structure characterizations confirmed the Fe/Mn loading, contributing to e - -transfer between Mn and Fe due to its conductivity. The synthesized G-F-M showed higher NO x reduction about 2.5 folds, than rGO@Fe 2 O 3 (G-FeO) and rGO@MnO x (G-MnO x ). The performance of G-M-F without and with an electrochemical system was also compared, and the difference was only 5%, which is an evidence of the spontaneous e - transfer between the Mn and Fe-NO x complex. The designed catalyst can be used for a long time without external assistance, and its efficiency was not affected significantly (<3.7%) in the presence of high oxygen contents (8%). The as-prepared G-M-F catalyst has great potential for executing a dual role NOx removal and self-regeneration of catalyst (SRC), promoting a sustainable remediation approach for large-scale applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 30
·期 3
·8098-8109
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IF 5.19
Shan Junyue,Wu Xianliang,Li Caifang,Hu Jiwei,Zhang Zhenming,Liu Huijuan,Xia Pinhua,Huang Xianfei
The photocatalytic degradation of antibiotics requires a good separation efficiency of photogenerated electron–hole pairs and a wide visible light absorption range. Current studies have discussed the successful preparation of ferroferric oxide/graphite carbon nitride/reduced graphene oxide (Fe 3 O 4 /g-C 3 N 4 /rGO). The phase structure and morphology of the Fe 3 O 4 /g-C 3 N 4 /rGO composites were characterized by XRD, HR-TEM, SEM, and EDS. The obtained composites were used to degrade tetracycline hydrochloride (TCH) to evaluate its photocatalytic activity. The effects of four variables on the degradation of TCH were analyzed by the response surface method and artificial intelligence (gradient regression tree, random forest, artificial neural network, etc.). The results showed that the graphite carbon nitride in the catalyst maintained its original structure and that the photocatalytic activity was significantly improved. The degradation rate of TCH was 86.7% under the optimal conditions (the Fe 3 O 4 /g-C 3 N 4 /rGO dosage was 0.1 g, pH = 7.0, the initial concentration of TCH was 20 mg/L, and the visible light irradiation time was 60 min). At the same time, the degradation rate of TCH changed little after the material was used five times, which indicates that the stability and recyclability of the Fe 3 O 4 /g-C 3 N 4 /rGO photocatalyst were excellent. Finally, a possible photocatalytic mechanism of the Fe 3 O 4 /g-C 3 N 4 /rGO photocatalyst is proposed in this paper.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Shuguo Yu,Hongyan Zhang,Jun Zhang,Ziyan Hu
Respiratory monitoring is an effective method to assess human health and provides valuable information for early warning and diagnosis of respiratory diseases. However, respiratory monitoring equipment relies on traditional power supply model, which limits real-time monitoring of breathing in fields of outdoor adventure, nomadism and long-distance running. As a solution, a triboelectric nanogenerator (TENG)-driven self-powered humidity sensor for human breath monitoring was prepared. A flexible TENG composed of Ti 3 C 2 T x : PDMS composite film and Ni/Cu polyurethane foam sponge was used as self-powered part of the device, RGO-TiO 2 humidity sensor was used as the respiratory sensing part of the device. Compared with the traditional humidity sensor, TENG-driven self-powered RGO-TiO 2 (TENG-RGTO) shows high response (359.2), fast response/recovery time (1/5.2 s), good reversibility, small humidity hysteresis (0.54%) in the range from 0% RH to 95% RH. Furthermore, TENG-RGTO humidity sensor can realize recognition of breathing states at different frequencies and intensities in real time. Meanwhile, a breathing alarm device driven by humans is designed. This research not only broadens the application range of TENG but also provides a new design idea for self-powered breathing monitoring sensor.
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MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Jintao Liang,Kaiteng Yan,Yutong Liu,Xiaoqing Yao,Fei Guo,Wen Xue,Guiyin Li,Jiejing Chen,Zhide Zhou
1,5-anhydroglucitol (1,5-AG) is an important indicator in the early detection of diabetes. In this study, a high-performance light addressable potentiometric sensor (LAPS) for the detection of 1,5-AG based on reduced graphene oxide-polyacrylamide-ferrocene/gold nanoparticles (rGO-PAM-Fc/AuNPs) as sensing membrane and pyranose oxidase (PROD) as the specific recognition substance was constructed. Among them, rGO-PAM-Fc/AuNPs modification LAPS chip can not only effectively increase the specific surface area and adsorb more PROD , but also enhance the capacitive effect of LAPS and improve the detection sensitivity. 1,5-AG is hydrolyzed by PROD and produces hydrogen peroxide (H 2 O 2 ) that can oxidize divalent ferrocene ions in the rGO-PAM-Fc composite to trivalent ferrocene ions, therefore leads to a change in the membrane potential on the surface of the LAPS chip and causes a shift in the I-V curve, which reflect the change of 1,5-AG concentration. The designed LAPS had a good linearity with 1,5-AG concentration in the range of 100.0–1000.0 μg/mL with a correlation coefficient of 0.99068. The sensitivity was calculated to be 0.1908 mV/μg/mL and a limit of detection (LOD) of 21.74 μg/mL was obtained using three signal-to-noise ratio (S/N = 3). Also, the 1,5-AG biosensor has good specificity, reproducibility and stability, and can be used in human serum samples with the recoveries of 93.62 %–114.52 %. This work provides a highly sensitive, portable and low-cost assay for the detection of 1,5-AG. Prime novelty statement Herein, a high-performance light addressable potentiometric sensor (LAPS) for the detection of 1,5-AG based on reduced graphene oxide-polyacrylamide-ferrocene/gold nanoparticles (rGO-PAM-Fc/AuNPs) as sensing membrane and pyranose oxidase (PROD) as the specific recognition substance was constructed. Among them, rGO-PAM-Fc/AuNPs modification LAPS chip can not only effectively increase the specific surface area and adsorb more PROD, but also enhance the capacitive effect of LAPS and improve the detection sensitivity. 1,5-AG is hydrolyzed by PROD and produces hydrogen peroxide (H 2 O 2 ) that can oxidize divalent ferrocene ions in the rGO-PAM-Fc composite to trivalent ferrocene ions, therefore leads to a change in the membrane potential on the surface of the LAPS chip and causes a shift in the I-V curve, which reflect the change of 1,5-AG concentration. The designed LAPS had a good linearity with 1,5-AG concentration in the range of 100.0–1000.0 μg/mL with a correlation coefficient of 0.99068. The sensitivity was calculated to be 0.1908 mV/μg/mL and a limit of detection (LOD) of 21.74 μg/mL was obtained using three signal-to-noise ratio (S/N = 3). Also, the 1,5-AG biosensor has good specificity, reproducibility and stability, and can be used in human serum samples with the recoveries of 93.62 %–114.52 %. This work provides a highly sensitive, portable and low-cost assay for the detection of 1,5-AG.
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ENERGY & FUELS
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2022
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IF 4.654
Fangzhao Pu,Xuecheng Zheng,Xintian Zhao,Xiaojing Zhang,Zhimao Yang,Hong Jin,Chuncai Kong
From the perspective of promotion of metal oxide anodes’ performance, structural design and reinforcement of carbon materials are always concerned as useful methods. In addition, high hope is being placed on the use of graphene as an ideal potential carbon reinforcement material for an abundant energy market, but currently, commercial graphene has poor intrinsic properties, which hamper its development in the energy storage area. Therefore, combining the metal oxide materials with commercial graphene by a rational structure design could be a more hopeful method to realize the productive use of commercial graphene in the energy storage area. In this work, hollow cupric oxide (CuO) decorated on reduced graphene oxide (rGO) is prepared by an effective glycol–water combined rapid oxidation strategy. The well-designed composite yields a high initial capacity of 1491 mAh/g and maintains 960 mAh/g after 500 cycles at 1.0 A/g. The remarkable reversible capacity may be attributed not only to the hollow structure of CuO, but also to the bidirectional synergy between graphene and the small-sized CuO. The galvanostatic intermittent titration technique (GITT) and density functional theory (DFT) calculation are conducted to analyze the relationship between the electrochemical properties and surface states. The GITT test shows that the ion diffusion coefficient is higher when the smaller hollow CuO is decorated on rGO. Additionally, the DFT results indicate that more active electrons appear on the surface of the composite. As a result, the as-prepared hollow and smaller CuO-decorated rGO presents excellent performance in terms of specific capacity and rate capability.
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MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Chenxi Wang,Pengcheng Zhao,Li Zhang,Yilin Wang,Qian Fu,Rongjie Li,Jiaodi Li,Chunyan Li,Yixi Xie,Junjie Fei
In this paper, a temperature-controlled “On-Off” electrochemical sensor for the detection of hydroquinone (HQ) is constructed by using a composite film of temperature-sensitive polymer poly (N-vinylcaprolactam) (PNVCL), the nanomaterial rGO@Au and the monoclinic bismuth metavanadate (m-BiVO 4 ). The sensor exhibits good temperature sensitivity and reversibility. When the temperature drops below the Lowest Critical Solution Temperature (LCST) of the PNVCL, the PNVCL will be in a “stretched” state, which hinders the electron exchange between hydroquinone and the surface of the electrode, presenting an “Off” state for the sensor. On the contrary, when the temperature exceeds the LCST, the PNVCL will be in a “contracted” state, which hydroquinone can perform an effective redox process and generate a response current, showing an “On” status. Due to the good electroconductivity and electrocatalytic ability of rGO@Au and m-BiVO 4 , the proposed sensor showed excellent detection performances. Hence, the sensor shows wide linear ranges (2.0 to 30.0 μM and 30.0 to 152.0 μM) and low limit of detection (0.6 μM). In addition, the “On-Off” electrochemical sensor may provide new ideas for the application of intelligent polymers.
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Frontiers in Chemistry
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2022
·
IF 5.545
Lu Xin-Yang,Li Jing,Kong Fen-Ying,Wei Mei-Jie,Zhang Pei,Li Ying,Fang Hai-Lin,Wang Wei
An electrochemical sensor for sensitive sensing of acyclovir (ACV) was designed by using the reduced graphene oxide–TiO2–Au nanocomposite-modified glassy carbon electrode (rGO–TiO2–Au/GCE). Transmission electron microscopy, X-ray diffractometer, and X-ray photoelectron spectroscopy were used to confirm morphology, structure, and composition properties of the rGO–TiO2–Au nanocomposites. Cyclic voltammetry and linear sweep voltammetry were used to demonstrate the analytical performance of the rGO–TiO2–Au/GCE for ACV. As a result, rGO–TiO2–Au/GCE exerted the best response for the oxidation of ACV under the pH of 6.0 PB solution, accumulation time of 80 s at open-circuit, and modifier amount of 7 µl. The oxidation peak currents of ACV increased linearly with its concentration in the range of 1–100 µM, and the detection limit was calculated to be 0.3 µM (S/N = 3). The determination of ACV concentrations in tablet samples also demonstrated satisfactory results.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yukun Li,Dan Zhang,Qishi Chen,Cong Chao,Junhong Sun,Shuying Dong,Yuyang Sun
In this study, reduced graphene oxide-based graphitic carbon nitride (rGO/g-C 3 N 4 ) composite was fabricated via thermal polymerization-hydrothermal method and were utilized to activate peroxydisulfate (PDS) under simulated solar light irradiation. The as-synthesized rGO/g-C 3 N 4 was demonstrated to effectively remove methyl orange (MO) in wastewater. Notably, 92.3% of MO (15 mg/L) was removed within 120 min in the presence of 0.2 g/L rGO/g-C 3 N 4 and 0.225 g/L PDS. The influence of activator dosage, PDS concentration and co-existing solution matrix on the removal efficiency was investigated. Free radical capture experiments confirmed that SO 4 ¯ · , photogenerated holes (h + ), O 2 ¯ · and non-radical reaction initiated by rGO played a major role in MO removal. Furthermore, PDS and rGO acted as the electron acceptor and transfer carrier of the photogenerated charges, respectively, resulting in the efficient activation of PDS. The promoting visible light absorption might be ascribed to the defect sites on the surface of rGO/g-C 3 N 4 , which generated from the rGO loading. This study revealed that the as-synthesized rGO/g-C 3 N 4 composite exhibits wide promising application prospects as a photocatalytic activator of PDS for the degradation of azo dyes in textile wastewater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Chunmiao Zhang,Mingxin Wei,Lianjin Chen,Meiling Ye,Xianzhen Nie,Aimei Zhu,Qiugen Zhang,Qinglin Liu
The poor long-term stability of anodic catalysts is one of the important factors that hinder the commercial application of direct ethanol fuel cells. The main reason is that toxic intermediates (such as CO) produced in the process of ethanol oxidation are easy to cover the active site, resulting in the catalyst being poisoned and deactivated in a short time. In this work, the prepared catalysts by the co-reduction method use didecyldimethylammonium chloride (DODAC) as the structure directing agent . The PdAg microporous alloy nanospheres in situ growth can effectively separate the GO sheets and slow down the stacking by self-intercalation effect. And introduced Ag into Pd lattice effectively modify the electronic structure of Pd and form OH − at a lower potential, which is helpful the oxidation of CO and weakens the poisoning effect of CO, improving the catalytic performance. After 20,000 s stability test, the residual current density value of mPd 1 Ag 1 @FrGO is 659 mA mg Pd - 1 , which is 20 times of Pd/C (JM). After 4 cycles of 20,000 s i-t test, its current density only dropped by 18.2%. In addition, the catalyst mPd 1 Ag 1 @FrGO has good regeneration ability. After 6 cycles of regeneration, the residual current density value is 878.1 mA mg Pd - 1 .
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