PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2022
·Vol. 24
·期 28
·17163-17173
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IF 3.945
Yanqing Guo,Meng Xia,Kexin Shao,Guangming Xu,Wei Cheng,Zhaorong Shang,Hao Peng,Yanguo Teng,Junfeng Dou
With the ongoing development and utilization of nuclear energy, uranium pollution has become an increasingly serious issue. Although many adsorbents are able to remove hexavalent uranium (U(VI)) from aqueous solution, the development of a high capacity adsorbent exhibiting superior stability would be beneficial. Grafting poly(amidoxime) (PAO) onto reduced graphene oxide (rGO) provides suitable U(VI) adsorption performance but the PAO is prone to agglomeration. The present work used density functional theory calculations to predict that PAO would bond with pyrrolic N atoms in nitrogen-doped rGO (N-rGO). To confirm this, PAO-grafted rGO (PAO-rGO) and PAO-grafted N-rGO (PAO-N-rGO) were prepared and characterized and the successful grafting of PAO on N-rGO was demonstrated. Adsorption experiments demonstrated that PAO-N-rGO exhibit superb U(VI) adsorption performance compared with the original PAO-rGO under acidic conditions. As for competing metal ions, Cu2+, Al3+, and Ca2+ have a greater impact on U(VI) adsorption than Na+, Mg2+, and K+ both for PAO-rGO and PAO-N-rGO. The maximum adsorption capacities of PAO-rGO and PAO-N-rGO for U(VI) were calculated to be 1500.26 and 1545.95 mg g−1, respectively. The mechanism of nitrogen doping promoting uranium(VI) adsorption can be attributed to enhanced PAO grafting and improvement of adsorption performance of the rGO. This work demonstrates that nitrogen doping is a viable strategy for enhancing the U(VI) adsorption performance of PAO-rGO.
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高影响因子
CHEMOSPHERE
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2022
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IF 8.943
Zhenyu Shi,Lei Rao,Peifang Wang,Lixin Zhang
In order to explore the influence of various carbon introduction on the morphology and photodegradation performance of C/g-C 3 N 4 composites, three kinds of different carbon materials: carbon nanotubes (CNT), graphene (GN) and carbon fibers (CF) were introduced to modify g-C 3 N 4 , and the morphologies, light absorption capacities and the underwater purifications of the composite photocatalysts were investigated. Results showed that the composites synthesized with different carbon substrates shows great differences in growth morphology. In addition, the introduction of various carbon sources also has a great impact on the physical and chemical properties of the composites. Compared with GN/g-C 3 N 4 and CF/g-C 3 N 4 , CNT/g-C 3 N 4 shows strong light absorption ability, especially in long-wavelength region (570–660 nm). To further study the difference of degradation ability of the composites in the underwater environment , the purification performance of modified g-C 3 N 4 at different water depths were carried out. The results show that under 40 cm of water, where the light intensity and ultra violet spectral are seriously attenuated, the purification efficiency of CNT/g-C 3 N 4 at 40 cm is 3.35 times than that of g-C 3 N 4 . This work provides insight in the design of highly efficient metal-free photocatalysts for the environmental remediation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Lichang Zhang,Kaiyun Wu,Yaxin Chen,Ren Liu,Jing Luo
A novel kind of graphene/polyaniline hybrid microcapsules loaded with self-healing agent (linseed oil, LO) were synthesized by Pickering emulsion template method in this work. In our strategy, graphene oxide (GO) was used as Pickering emulsifier to stabilize emulsion droplet containing aniline and linseed oil . After the polymerization of aniline, graphene/polyaniline microcapsules loaded with linseed oil (LO@GO/PANI) were prepared. By adjusting GO concentration and oil-water ratio, the size of the emulsion droplet and LO@GO/PANI microcapsule can be controlled at about 15–20 µm. The successful synthesis of LO@GO/PANI microcapsules was proved by SEM, FT-IR and TGA . The unique GO/PANI hybrid shell combined the outstanding barrier property of GO and anti-corrosion function of PANI. The solvent resistance results showed that the as-prepared microcapsules possessed stronger resistance to organic solvents . A smart coating with dual functions of anti-corrosion and self-healing was prepared by dispersing the as-prepared LO@GO/PANI microcapsule in waterborne epoxy resin . As the contents of microcapsules was 10 wt%, the scratch of the coating was completely healed after 12 h observed from the microscope images. The electrochemical impedance spectroscopy (EIS) and salt spray test all verified that the incorporation of microcapsules could significantly improve the anti-corrosion performance of the water-borne coatings. After 40 days' immersion, the low frequency modulus of the composite coating was almost 2 orders of magnitude higher than that of pure epoxy coating, and no obvious corrosion product was observed after 500 h salt spray test.
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VACUUM
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2022
·
IF 4.11
Xinjiang Zhang,Ziqing Chen,Zhaohui Liu,Meng He,Zirun Yang,Jiahui Wang
The in-situ hybrid particle-reinforcements are a novel strengthening mode for the advanced metal matrix composites . In this study, Zr matrix composites incorporating the fixed amount of ZrC particles with the different amounts of Y 2 O 3 particles were prepared by the in-situ reaction among Zr, graphite, Y, and ZrO 2 during the arc-melting. Results revealed that the graphite/Zr reaction produced the uniform in-situ ZrC particles in the Zr matrix, and the Y/ZrO 2 reaction formed the Y 2 O 3 particles. In-situ Y 2 O 3 addition refined the Zr matrix and led to the polygonal morphology of the ZrC particle. The coarser Y 2 O 3 grew in bulk, and some fine Y 2 O 3 dendrites were formed along Zr boundaries. The influence of different contents of Y 2 O 3 reinforcements on the hardness and compressive properties were analyzed. Compared with the single ZrC reinforcements, the hybrid Y 2 O 3 introduction resulted in a higher hardness and enhanced compressive strength . This hybrid structures were believed to be favorable to mechanical responses in the composites, and the relevant mechanisms for the hardening and strengthening effect of such hybrid forms were discussed.
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APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Yanjun Li,Ruhao Zan,Yuanjin Wang,Longqiang Shang,Ronghui Wu,Yue Liu,Zhenggang Rao,Kai Yao,Yi Liu,Linfeng Fei
Graphene-based materials are frequently highlighted as the candidate for solar steam generation (SSG) because of their advantages such as high solar absorption, tunable structure and low cost. However, graphene itself is not a “perfect” absorber for full solar spectrum and cannot efficiently transport water on its surface due to its intrinsic physicochemical characteristics. Here we designed and synthesized a graphene foam in a three-dimensional (3D) interconnected porous structure with silicon carbide nanoparticles anchored on graphene surfaces. The systematical characterizations confirm that the hybrid structure extends the solar absorption window of graphene in full solar spectrum; and moreover, the in situ environmental scanning electron microscopy (ESEM) experiments suggest the incorporation of SiC nanoparticles on two-dimensional graphene surface improves the condensation and transportation kinetics of water in the foam. As a result, the SSG device based on the graphene-SiC composite demonstrates an improved energy conversion efficiency up to 95% under one sun illumination compared with those of previous reported graphene-based materials. The findings may shed new light on the technologies for solar-energy-water nexus.
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JOURNAL OF MEMBRANE SCIENCE
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2022
·
IF 10.53
Yi-Hang Gu,Xi Yan,Yan Chen,Xiao-Jing Guo,Wan-Zhong Lang
Herein, we propose one novel strategy by layer-by-layer (LBL) self-assembly method to prepare two-dimensional (2D) laminar membranes assembled between sulfonated graphene oxide (S-GO) nanosheets and various cationic dyes on the polyethyleneimine (PEI) -modified Nylon-6 (PA6) substrate. The membrane performances are manipulated exquisitely by the charge of substrate, the assembled dye type, dye size, self-assembly layer number etc. The water permeance positively correlates with the height of assembled cationic dyes. The amido bonds or sulfamide bonds and π–π conjugation endow the resulted membrane with strong performance stability. Furthermore, by precisely selecting the size and charge the assembled dye, the prepared LBL GO membranes can efficiently separate mixed dyes in aqueous solution via charge repulsion or/and size sieving mechanism. For example, the separation selectivity of 39.2 for the mixed Rhodamine B/Ethyl Violet (RB/EV) dyes can be achieved with the LBL MV-0.25-2-2 membrane (it was assembled by 2 mmol L −1 Methyl violet solution for two S-GO layers with the Nylon-6 substrate modified with 0.25 wt % PEI aqueous solution). Simultaneously, the introduced cationic dyes endow these membranes with extra antibacterial capacity to both E. coli and S. aureus .
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LANGMUIR
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2022
·
IF 4.331
Yingqi Heng,Daman Xu,Heng Fang,Chengjin Zhong,Dongying Hu
The cellulose-based polydopamine modified separator (LID-PDA) and polydopamine/graphene/polypyrrole modified electrode (LID-PDA-GR/PPy) were successfully fabricated by dissolving–regenerating and phase-inversion methods via dopamine polymerization and doping modification of graphene (GR) and polypyrrole (PPy) in a lithium chloride/N,N-dimethylacetamide solvent system. The structure and physical properties of the LID-PDA film material play a positive role in its application in supercapacitor separators and electrodes. The effect of PPy content on the electrochemical performance of the electrode shows that the LID-PDA-GR/PPy-30 electrode has the best performance (2.2 Ω, 237.2 F/g at 0.5 A/g). The cellulose-based supercapacitor assembled from the LID-PDA-GR/PPy-30 electrode and LID-PDA separator shows good electrochemical energy storage properties (439.0 F/g at 0.2 A/g, 36.2 Wh/kg corresponding to 2.2 kW/kg). Based on the microstructural properties of natural and renewable cellulose substrates, combining polymerization and doping to realize the complementarity between materials is meaningful for the application and development of energy storage materials.
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TALANTA
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2022
·
IF 6.556
Mingxing Liu,Rongrong Jiang,Meie Zheng,Mengjiao Li,Qingjie Yu,Hongda Zhu,Huiling Guo,Hongmei Sun
A sensitive unlabeled ratiometric biosensor was developed to the detection of cardiac troponin I (cTnI). This biosensor was established by using the glassy carbon electrode coated with graphene oxide to form a platform bonded with N, Zn co-doped graphene quantum dots (N, Zn-GQDs). The N, Zn-GQDs was successfully prepared as the raw materials of graphite powder and characterized. Antibodies of cTnI were bonded to the surface of N, Zn-GQDs as the nanoprobe by amide bonds. The signals of electrochemiluminescence (ECL) and differential pulse voltammetry (DPV) were exposed to decrease in the presence of cTnI, which caused the signal substance to move farther away from the electrode. It was found that the immune complex layer attenuated the intensity of ECL and DPV which could be used as the good overall signal for determining concentration of cTnI. The ratiometric biosensor had a good response to cTnI with the detection limit is 4.59 pg L −1 in the concentration range of 10–10 6 pg L −1 . The developed method was evaluated for the detection of cTnI in human serum, and the obtained results were consistent compared to the reference values obtained by hospital standard enzyme linked immunoassay (ELISA) with 9.09%–11.1% of RSD. Our findings suggested that this ratiometric biosensor could be used to the detection of cTnI in human serum with lower cost and higher sensitivity, it also might be better potential application prospect based on N, Zn-GQDs to detect other biomarkers.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ze Zhang,Cunqian Fang,Yuanqi Weng,Xiao Luo,Qizhong Huang,Huiping Hu
Graphene was introduced into C/C–SiC composites via pressureless impregnation to enhance the mechanical and thermal properties of the composites. The effects of various graphene contents on the mechanical and ablative performances of C/C–SiC composites were investigated. The results showed that the ultimate bending stress and compressive stress of the C/C–SiC composites increased by 28.98% and 23.64%, respectively, after adding 7.25% graphene. Moreover, the ablation rates of the composites were vastly decreased after adding a slight graphene content (2.13%). However, the ablation rates increased with increasing of graphene content, indicating that the benefit of introducing graphene on the ablation property decreased, which was mainly ascribed to the relative reduction in the SiC content. As a result, introducing slight graphene into C/C–SiC composites had the greatest benefit on the anti-ablation performance.
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SURFACE & COATINGS TECHNOLOGY
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2022
·
IF 4.865
Haijie Chen,Zhiwen Zheng,Hongxiang Yu,Xiaolong Liu,Dan Qiao,Dapeng Feng,Zenghong Song,Jian Zhang
Friction and wear seriously affect the performance, service life and stability of metal moving parts. In this work, a novel GO composite film grafted with POCl 3 was fabricated on metal substrates, including SS, Ti and Al. These films showed excellent tribological properties, including high carrying capacity, low friction coefficient (COF) and low wear volume on the macroscale. A tribofilm composed of GO nanoflakes and metallic phosphate was formed in the wear track of SS substrate. In addition, amorphous carbon and metallic phosphate were the main components of the transfer layer formed on the surface of the steel ball. The excellent tribological properties were dominated by GO, and the great wear resistance was attributed to the formation of metallic phosphates during the friction process. Simulation results showed that the oxygen of metallic phosphate was derived from GO modified with POCl 3 rather than air. Taking the synergistic effect of GO and POCl 3 into account when designing nanocomposite films is of great value in industrial applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Minjun Liu,Ying Liu,Xinru Liu,Chengcheng Chu,Ducheng Yao,Shun Mao
Metal organic framework (MOF)-derived materials normally have three-dimensional (3D) structure, while little attention has been paid to two-dimensional (2D) MOF-derived materials with high catalytic activity. Nevertheless, the underlying agglomeration and metal leaching issues of 2D MOF-derived catalysts hinder their real applications. In this work, we report a bimetallic nanocomposite (Ni-Fe-C-600-acid/GO) derived from 2D Ni-Fe-MOF and graphene oxide (GO) network. Employing Ni(0) and Fe 3 O 4 as active site, the Ni-Fe-C-600-acid/GO shows high efficiency in peroxydisulfate (PDS) activation for the removal of p-chloroaniline (PCA), and the catalyst/PCA dosage ratio (0.8) is substantially lower than those of the previous studies (3.9–156.9). The prepared catalysts demonstrate high catalytic activity over a wide pH range of 3–9 and maintain high efficiency after five cycles with good tolerance to inorganic anions. The singlet oxygen is identified as the predominant active species and relatively weak contributions from sulfate free radicals and hydroxyl radicals are confirmed. This catalysis system presents new insights in 2D MOF-derived catalysts in advanced oxidation processes .
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Xiangfeng Shu,SaiChao Yan,Bo Fang,Yenan Song,Zhenjie Zhao
We designed a promising three-dimensional (3D) nitrogen-doped reduced graphene oxide-based aerogel (NGA) with silver nanowires (Ag NWs) assisted self-supporting networks for enhanced electromagnetic wave (EMW) absorption. 3D AgNWs@NGAs (8–12 mg/mL) were synthesized by a three-step strategy of sonication, reduction, and lyophilization. The results show that introduced sp 3 defects and disordered sites in nitrogen doping from a rarely-reported liquid nitrogen source of acetonitrile remarkably improved electronic dipole polarization relaxation and EMW absorption ability. Besides, electronic band structure and density of states of the NGA were investigated by first-principles calculations to indicate that the carrier mobility became smaller during nitrogen doping. The Ag NWs were distributed on an NGA as the 3D network structure of an elastic support and a conductive and compatible unit, which limited the aggregation of NGA flakes, and further strengthened conductive loss. Significantly, the synthesized ultralight AgNWs@NGA exhibits excellent performance at 9.52 GHz, with a strong minimal reflection loss of –79.99 dB, a small thickness of 2.660 mm, a wide effective absorption bandwidth of 3.5 GHz, and an ultra-low filler content of 5 wt%. Furthermore, a large specific surface of 331.5 cm 3 /g, a good conductivity of approximately 50 S/cm, a high resilience, and an excellent heat insulation capability, guarantee the durable stability in EMW absorption of AgNWs@NGAs to resist distortion and heat attacks.
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