ANALYST
·
2022
·Vol. 147
·期 22
·5011-5017
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IF 5.227
Jiaxi Yin,Hairong Cui,Ling Lei,Kangbing Wu
Graphene nanosheets (GS) were prepared by ultrasonic exfoliation of bulk graphite in N-methyl-2-pyrrolidone with the assistance of sodium pyrophosphate. The obtained GS suspension was modified on a glassy carbon electrode (GS/GCE), and then functionalized at different voltages (e.g. 1.0, 1.4 and 1.6 V) for 2 min in pH 7.0 phosphate buffer. The electrochemically functionalized GS/GCE (i.e. EGS/GCE) possesses more oxygen-containing groups and a higher defect level. More importantly, the active response area, electron transfer ability and interface adsorption capacity of the EGS/GCE enhanced remarkably. The possible mechanism of the performance enhancement is discussed, and the sensing application of the EGS/GCE in the detection of nitrofurazone (NFZ) is investigated. Compared with the GS/GCE, the EGS/GCE is much more active for NFZ oxidation and greatly increases the detection sensitivity. As a result, a highly sensitive electrochemical detection method has been developed for NFZ, with a detection limit of 2.1 nM. The practical application of the EGS/GCE was tested in fish meat samples, showing good accuracy and feasibility.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Huaiyang Chen,Xiaoping Shen,Zhenyuan Ji,Jia Cheng,Guangxiang Liu,Leiming Lang,Yao Chen
In this paper, porous Mn 3 O 4 –Fe 3 O 4 nanoparticles with highly uniform composition are in-situ anchored on reduced graphene oxide (rGO) nanosheets by a simple cyanometallic framework template method . Thanks to the synergistic effects between the porous Mn 3 O 4 –Fe 3 O 4 nanoparticles and the well-conductive rGO nanosheets, the Mn 3 O 4 –Fe 3 O 4 /rGO composites present superior electrochemical lithium storage performances with a great reversible capacity of 1013 mAh g −1 after 100 cycles at 0.1 A g −1 , satisfactory rate capability of 510 mAh g −1 at 3.0 A g −1 , and eminent long-term cycle stability of 804 mAh g −1 after 500 cycles at 0.5 A g −1 . It is demonstrated that the rGO can not only act as a conducting matrix, but also buffer the volume expansion and avoid the aggregation of the Mn 3 O 4 –Fe 3 O 4 nanoparticles during charging-discharging. The work provides a simple strategy for designing and fabricating advanced multi-component metal oxide-based anodes for high-performance lithium-ion battery.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
·
IF 4.598
Lanlan Tian,Yuanlin Xie,Jing Lu,Qiang Hu,Yongneng Xiao,Tiefeng Liu,Bekchanov Davronbek,Xiaoquan Zhu,Xintai Su
A three-dimensional (3D) Fe 3 O 4 / N -doped graphene aerogel composite (Fe 3 O 4 /NGA) was constructed via a simplistic two-step method of hydrothermal reaction-roasting using iron (Ⅱ) phthalocyanine (FePc) and graphene oxide (GO) as raw materials. GO nanosheets can self-assemble into 3D aerogels and be converted into reduced graphene oxides (rGO) in the first step of the hydrothermal process. Further, Fe 3 O 4 /NGA with a strong chemical coupling can be obtained via roasting (the second step) based on the fact that FePc and rGO can be tightly combined under the chemical reaction of oxygen-containing functional groups. The electrochemical properties were studied by cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge/discharge measurements, which exhibit superior cycling performance with high rate capability as anode applied in a lithium-ion battery. The specific capacity of Fe 3 O 4 /NGA-90 was still up to 1184.8 mAh/g after 500 cycles at a current density of 1 A/g. These exciting results indicate that the 3D Fe 3 O 4 / N -doped graphene aerogel composite exhibits superior performance as an active material for the use of lithium-ion batteries.
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CHEMOSPHERE
·
2022
·
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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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 36
·17438-17455
·
IF 3.925
Qingcan Xiang,Zongxue Yu,Xuyang Li,Pingquan Wang,Niandan He,Yao Pang,Qiuxiang Wang,Yucheng Liu
A g-C3N4/NH2-MIL-88B(Fe)/CD@GO membrane (M2) was prepared by a simple vacuum filtration method. By embedding a Z-scheme heterojunction composite photocatalyst into graphene oxide (GO) nanosheets, not only can the water molecule transport channel be regulated, but the membrane can also be endowed with photocatalytic activity and membrane fouling is effectively alleviated. The pure water permeation flux of M2 (253.26 L m−2 h−1 bar−1) was 13 times that of the original GO membrane (18.83 L m−2 h−1 bar−1). What's more, even after 10 cycles, M2 still maintains excellent separation efficiency and flux. After six cycles, the rejection of Congo Red (CR), Malachite Green (MG) and Rhodamine B (RhB) by M2 was over 95%. At the same time, under the conditions of an extreme pH value and high salt concentration, the rejection of dye remained at the original level after six cycles. Therefore, the novel photocatalytic membrane has excellent separation performance, stability and photocatalytic activity, and can be used as a potential membrane for wastewater purification and environmental protection.
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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Rui Wang,Jiayi Wu,Jingxian Zheng,Baoliang Chen,Xiaoying Zhu
Conventional homogeneously charged nanofiltration (NF) membranes showed limited capabilities in ion transmembrane behavior control, which hindered the ion separation performances. In this study, novel Janus membranes were developed to manipulate the penetration of monovalent and divalent ions in NF. Graphene oxide nanosheets with enhanced positive charge (PGO) and negative charge (NGO) were successfully synthesized and assembled in designed orders and proportions to construct the Janus membranes with desired upper and lower surface charges. The positively charged upper surface and the negatively charged lower surface of the PN Janus membrane showed high retention of divalent cations but high permeation of monovalent cations; when the mass ratio of PGO to NGO was 1–5, the PN-1/5 membrane indicated a significant Li + /Mg 2+ separation factor at 23.5. On the other hand, the NP-4/2 Janus membrane composed of negatively charged upper layer and positively charged lower layer indicated the most promising indiscriminate divalent ion removal efficiency (>80%) as compared with the literature. The molecular dynamics simulation theoretically proved the ion penetration behavior manipulation by the Janus membranes were feasible. This study proposed a facile strategy to dramatically improve the performances of NF in Mg 2+ /Li + separation and indiscriminate divalent ion removal.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 98
·期 3
·744-755
·
IF 3.709
Ting Liu,Dandan Li,Kangkang Huang,Shaozao Tan,Langhuan Huang
Water pollution caused by oil spills and organic solvents have seriously affected the quality of the environment, so the development of green and recyclable oil adsorbents with excellent properties has drawn massive attention from researchers. In this work, bamboo powder (BP) and reduced graphene oxide (GO) were used as raw materials to create a bamboo fiber/graphene aerogel (BGA) aerogel by a green one-pot hydrothermal method. Then, a three-dimensional aerogel super-hydrophobic modified bamboo fiber/graphene aerogel ( H@BGA) with super-hydrophobic properties and a high adsorption capacity was synthesized by using hexadecyltrimethoxysilane (HDTMS) as hydrophobic modification reagent. In this unique ternary aerogel, both bamboo powder and HDTMS could improve the hydrophobicity of the aerogel. Furthermore, the uniformly interspersed bamboo fibers facilitated the exfoliation of graphene, constructing abundant pores and endowing the sample with a large specific area and excellent mechanical properties. The as-prepared H@BGA featured low density, high specific surface area, super-hydrophobicity (WCA = 151.5°), and high adsorption capacity (55–123 g g −1 ). In addition, the adsorption capacity of H@BGA could remain above 95% after 8 cycles of the adsorption/desorption process. Overall, the aerogel has broad application prospects in the field of water/oil separation. © 2022 Society of Chemical Industry (SCI).
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JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Qiaomei Lu,Shuting Lin,Qingqing Ding,Huiling Zhang,Ping Tong,Min Fang,Wenmin Zhang,Lan Zhang
Covalent organic framework composites have received great interest and regarded as new-generation porous materials in application of sample preparation. In this work, an agaric-like graphene oxide @ covalent organic framework (AGO@COF) composite was first synthesized and used as an ideal adsorbent for enrichment of trace cytokinins (CKs) due to its large specific surface area, rich in micro-mesopore and organic functional groups. The contact areas between AGO@COF composite and CKs were greatly increased due to the special agaric-like morphology, which would further improve the extraction efficiency. Hence, a rapid, simple and efficient AGO@COF-based dispersive solid-phase extraction method for detecting four CKs (N 6 -(delta 2-isopentenyl)-adenine, kinetin, DL-dihydrozeatin and 6-benzylaminopurine) was successfully established. The proposed method had low limits of detection (0.1−2.0 pg mL −1 ), good reproducibility (RSDs≤3.9%, n =5) and high recoveries (84.4−107.7%). With this method, N 6 -(delta 2-isopentenyl)-adenine and 6-benzylaminopurine in plants were successfully detected and quantified. Results showed that the developed AGO@COF composite possessed superior extraction performance and potential application in enrichment of trace targets from complex plant samples.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2022
·
IF 2.042
Abdullah Akhdhar,Amr A. Yakout
Heavy metals sequestration from industrial discharges has aroused increasing attention worldwide to cleaner and sustainable water production by developing fast, effective eco-friendly nanosorbents. This study aimed to design a robust and fast nanocomposite to remove heavy metal ions, mainly Pb(II) and Cd(II). To this end, poly-(2-aminothiophenol); PATP was incorporated into graphene oxide; GO to fabricate PATP@GO nanocomposite. The structure and morphology of the novel nanocomposite were evaluated by FTIR, TEM, XRD, Raman, EDX, and TGA. Integrating PATP improved the adsorption efficiency of the GO from 61.3% to 98.6% for Pb(II) and 34.6% to 87.3% for Cd(II). Furthermore, the impact of pH, the mass of nanocomposite, metal ions concentrations, and coexisting ions were thoroughly investigated and optimized. The potential efficiency and adsorption capacity of PATP@GO nanocomposite toward Pb(II) was 98.6.00%, 142.9 mg.g-1 for Pb(II) at pH 5 and 87.3%, 125.0 mg.g-1 for Cd(II) at pH 7 within 25 minutes, respectively. This behavior was explained in terms of strong complex formation with the thiol groups of PATP, as well as the hydroxyl and carboxyl groups in GO. Kinetic studies were based on pseudo-second order (R2 > 0.99) and the adsorption data are best fitted with the Langmuir model. The excellent stability of PATP@GO nanocomposite enabled effective extractions for seven successive runs (98.6%-95.3% for Pb(II) and 87.3–85.1% for Cd(II)). The developed PATP@GO nanocomposite is believed to show fast and high potential in detoxifying of heavy metal ions from different environmental samples in aquatic life.
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CARBON
·
2022
·
IF 11.307
Xiang Xu,You Yang,Yong Guan,Dafu Wei,Anna Zheng
Carbon nanotubes (CNTs) were found to exhibit a remarkable catalytic effect on the decomposition of benzoyl peroxide (BPO) in ethanol at room temperature. The catalytic effects of various carbonaceous materials were investigated by UV spectroscopy . The decomposition reaction for BPO/CNT/ethanol system was studied through gas chromatography-mass spectrometry, infrared spectroscopy and free radical trapping technique. Those results indicated the decomposition of BPO by CNTs occurred via a free-radical pathway involving benzoate radicals. The catalytic mechanism of CNTs was further investigated through electron spin resonance (ESR) spectroscopy and quantum chemical calculations. The ESR signals with same line shape and g -value were found in multi-walled CNTs, single-walled CNTs, and oxidation product of pyrenol. The persistent free radicals (PFRs) on CNTs were essentially aryloxy radicals ([ArO] • ) with spin electrons dispersed on the aromatic plane. Polycyclic aromatic hydrocarbons with larger π-conjugated structures and more aryloxy radicals exhibited a stronger electron-transfer ability. Finally, a three-step pathway for CNTs to decompose BPO was proposed: (1) formation of an asymmetric peroxide (ArO-OOCC 6 H 5 ) via free radical exchange; (2) conversion of ArO-OOCC 6 H 5 into radicals ([ArO] • and C 6 H 5 COO • ), or ions ([ArO] + C 6 H 5 COO − ); (3) formation of benzoic acid by hydrogen or proton abstraction. This study offered tremendous insight into the electronic structures and catalytic mechanism of CNTs, and can facilitated their development for ROS production and scavenging.
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高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Fudong Zhang,Guodong Zeng,Ying Zhou,Xiaona Li,Youming Dong,Yahui Cai,Jianzhang Li,Jiongjiong Li,Zhen Fang
Designing organic-inorganic nanohybrid systems have exhibited considerable potential in fabricating high-performance protein-based adhesives. However, the simplicity of the strategy, renewability, cost and effective dispersion of inorganic nanofillers in a hybrid framework remains challenging. This study proposed a simple, cost-effective, and sustainable design strategy to fabricate soybean meal (SM)-based hybrid adhesives using sodium lignosulfonate-functionalized graphene (SLS@G). SLS@G was simultaneously produced and functionalized via a dry ball milling method from graphite without using toxic reagents and tedious fabrication procedures. SLS@G had stable water dispersion and good compatibility with the SM adhesive matrix. The synergistic hydrogen bonding and hydrophobic interaction between SLS@G and the protein chains remarkedly improved the strength and water resistance of the SM-based adhesive. With minimal addition of the SLS@G (0.10 wt% of SM), the modified adhesive dry and wet shear strengths increased to 2.19 MPa and 1.15 MPa, which were 32.7% and 248.5% higher than the pristine adhesive, respectively. Moreover, the construction of the organic-inorganic nanohybrid structure also contributed to the thermal stability of the SM-based adhesives, leading to the increase in carbon residue rate from 26.6% to 28%. Overall, this facile and green strategy offers a new design pathway for developing advanced and multifunctional bio-adhesives for engineered wood-based composites.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Jinmei Luo,Shuhuai Li,Yuwei Wu,Chaohai Pang,Xionghui Ma,Mingyue Wang,Chenghui Zhang,Xu Zhi,Bei Li
The key to improving the sensitivity of electrochemical sensors for direct detection is the introduction of catalytically amplified nanomaterials. Accordingly, in this study, a new strategy for the preparation of electrochemical sensors with multiple amplification effects is proposed. Graphene oxide (GO), gold nanoparticles (Au NPs), and β-cyclodextrin (β-CD) were introduced to the surface of a glassy carbon electrode via cyclic voltammetry to prepare a modified electrode sensor with a GO/Au NPs/β-CD thin film. The prepared sensor effectively catalyzed and amplified the reduction current of imidacloprid in a B-R buffer with pH = 5.0 owning to the multiple amplification effects of GO/Au NPs/β-CD. A good linear relationship was observed the level of the reduction current response and the imidacloprid at concentrations ranging from approximately 5 × 10 −10 to 3000 × 10 −10 mol/L; thus, a new imidacloprid detection method using an electrochemical sensor was established. The new method, whose detection limit reached 1.33 × 10 −10 mol/L, was tested on actual samples, achieving recoveries of 92.0 % to 110.0 %.
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