SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Liangzhong Li,Chang Liu,Ruixue Ma,Yunjiang Yu,Zhaofeng Chang,Xiaohui Zhang,Chenyu Yang,Da Chen,Yang Yu,Wei Li,Yongdi Liu
In this study, Fe 3 O 4 @TiO 2 decorated reduced graphene oxide (RGO) nanosheets were synthesized by loading iron oxide on the surface of RGO nanosheets and subsequently coating by titanium oxide, which can be employed as the persulfate (PS) activator and high-performance adsorbent toward thallium (Tl). PS could be effectively activated by the Fe 3 O 4 @TiO 2 decorated RGO nanosheets due to the presence of RGO and Fe(II), resulting in the rapid oxidation of Tl(I) to Tl(III). The removal of Tl(I) was found to be pH-dependent, with the removal efficiency of more than 88.5% in the pH range of 8.0–12.0 at the optimal PS dosage of 10 mM and material dosage of 0.2 g/L. The surface precipitation of Tl 2 O 3 and enhanced adsorption affinity toward Tl were deduced to be main mechanisms for the extremely efficient removal of Tl(I) ions during the oxidation and adsorption hybrid process. The maximum removal capacity of the material at pH 8.0 was estimated as 673.2 mg/g based on the fitting result from the Langmuir model. Approximately 94.7% of ultimate removal capacity could be accomplished within the first 10 min at the initial Tl concentration of 8.5 mg/L. The PS catalytic oxidation coupled with the adsorption technique using the prepared Fe 3 O 4 @TiO 2 decorated RGO nanosheets were proven to be a promising approach for Tl(I) removal from water.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Tingting Yu,Qingsong Liu,Zhiyuan Zhu,Wenwei Wu,Lifen Liu,Jinlong Zhang,Changfei Gao,Tao Yang
Using a Z-scheme MoS 2 /rGO/Bi 2 S 3 loaded onto carbon felt (CF) as the anode and BiOBr as the cathode in a photocatalytic fuel cell (PFC) was found to be an efficient photocatalytic system for degrading water contaminants such as antibiotics. Some standard analytical techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet–visible spectrophotometry (UV–Vis DRS), ultraviolet photoelectron spectroscopy (UPS), electron paramagnetic resonance (EPR), high performance liquid chromatography-mass spectrometry (HPLC-MS) and electrochemical analysis (cyclic voltammetry, CV and current-time curve, I-t ), were applied to characterize the diverse properties of the electrodes. First, two typical antibiotic contaminants, berberine chloride (BEC) and tetracycline hydrochloride (TC), were used to investigate the degradation ability of the electrodes. As expected, results showed that the degradation of TC and BEC using MoS 2 /rGO/Bi 2 S 3 @CF was consistently above 90%, whereas the degradation achieved by independently using rGO/Bi 2 S 3 @CF and rGO/MoS 2 @CF was consistently below 85% and as low as 53%; this verified the excellent formation of the heterojunction. In addition, to further investigate the performance of MoS 2 /rGO/Bi 2 S 3 @CF, the test results under different conditions were discussed, such as pH, electrochemical property, light reactivity, dark absorption and recyclability in depth. All results of MoS 2 /rGO/Bi 2 S 3 @CF demonstrated good performance than rGO/Bi 2 S 3 @CF and rGO/MoS 2 @CF. Based on the UV–Vis DRS, UPS, EPR and trapping agent experiment results, the electron generated and Z-scheme transport mechanism in the fuel cell was proposed. Moreover, electron transmission from MoS 2 /rGO/Bi 2 S 3 @CF to BiOBr@CF through an external circuit further suppressed the recombination of electron-hole pairs. This new catalytic pollution control route is expected to provide a new way for efficient pollutant degradation with low energy consumption.
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EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Xiaoping Zhou,Chenhui Ding,Chuyun Cheng,Shuwu Liu,Gaigai Duan,Wenhui Xu,Kunming Liu,Haoqing Hou
High mechanical performance electrospun polymeric nanofibers are highly desired for practical applications, especially as reinforcements for composites. However, most of the electrospun polymeric nanofibers present tensile strength < 3 GPa. To overcome such limitation, this work successfully prepared single rGO reinforced polyimide composite nanofiber with tensile strength up to 4.2 GPa (PI/rGO-1.0%) and modulus up to 121 GPa (PI/rGO-1.2%) by applying in-situ polymerization, electrospinning, and in-situ thermal conversion. These mechanical properties are higher than other polymer-based electrospun nanofibers, and 45% and 236% higher than those of neat PI single nanofiber, respectively. The in-situ strategies provide the homogeneous dispersion of rGO in single electrospun nanofibers and enhance the interfacial interaction between rGO and PI. In addition, the PI/rGO composite nanofibers also present excellent thermal stability with glass transition temperature (T g ) > 295 °C, and the 5% thermal decomposition temperature (T 5% ) > 539 °C. This work would open a new route for the preparation of high performance electrospun nanofibers for composites.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2021
·
IF 3.995
Ming Zhang,Fengqi Zhao,Yanjing Yang,Hui Li,Ting An,Jiankan Zhang
rGO-Fe 2 O 3 nanocomposites with spherical, hollow and fusiform Fe 2 O 3 (s, h and f) microstructures have been successfully fabricated using DMF as solvent via a facile solvothermal method. The morphologies and compositions of the as-synthesized rGO-Fe 2 O 3 (s, h and f) nanocomposites were systematically studied using SEM, TEM , XRD , FTIR, RAMAN and XPS analysis . The rGO-Fe 2 O 3 (s, h and f) nanocomposites were used to catalyze the thermal decomposition of energetic TKX-50 and the corresponding kinetic parameters were calculated using an isoconversional model. The catalytic performance of Fe 2 O 3 (s, h and f) during the thermal decomposition of TKX-50 was significantly improved after being anchored onto the surface of graphene oxide . The as-synthesized rGO-Fe 2 O 3 (h) and rGO-Fe 2 O 3 (s) nanocomposites have an excellent effect toward reducing the temperature and apparent activation energy ( E a ) for TKX-50 decomposition, respectively. The excellent catalytic performance of rGO-Fe 2 O 3 (h) nanocomposite can be attributed to its external and internal surfaces, which provide more active sites for TKX-50 decomposition. In addition, the interactions formed between rGO and Fe 2 O 3 have a positive effect toward reducing the E a .
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Nanoscale
·
2020
·Vol. 12
·期 7
·4374-4382
·
IF 6.895
Xingmei Guo,Cheng Qian,Xiaohan Wan,Wei Zhang,Haowei Zhu,Junhao Zhang,Hongxun Yang,Shengling Lin,Qinghong Kong,Tongxiang Fan
Streptococcus thermophilus, a Gram-positive (G+) bacterium featuring a teichoic acid-rich cell wall, has been employed as both a phosphorus source and template to synthesize a biomorphic Co2P-Co3O4/rGO/C composite as an efficient electrocatalyst for the oxygen reduction reaction (ORR). Different from the conventional method for the synthesis of phosphides, bio-derivative phosphorus vapor was emitted from the inside out, which facilitated the in situ transformation of the chemically adsorbed Co precursor on the bacteria into Co2P-Co3O4 heterogeneous nanoparticles, which featured a Co2P-rich body and Co3O4-rich surface. Besides, reduced graphene oxide (rGO) was also introduced in the synthetic process to keep Co2P-Co3O4 scattered and further promote the electron transport efficiency. All the Co2P-Co3O4 nanoparticles and rGO sheets were supported on the bacteria-derived carbon substrate with submicron-spherical morphology. The as-obtained Co2P-Co3O4/rGO/C composite exhibited excellent electrocatalytic performance for ORR with onset and half-wave potentials of 0.91 and 0.80 V vs. RHE, respectively. Furthermore, its long-term stability and methanol tolerance were better than those of commercial Pt/C. Thus, this work presents a new strategy of using an interior bio-phosphorus source to obtain heterojunction particles featuring a phosphide-rich body and oxide-rich surface, which may provide some insights for the construction of efficient heterogeneous electrocatalysts.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Yan Wang,Xiaochuang Di,Xinming Wu,Xuanhua Li
Lightweight and high-efficiency electromagnetic (EM) wave absorption are two key factors in the research of new-type absorbers, which could be obtained by regulating the component, structure, or suitable impedance matching. In this paper, a nanoporous carbon/Co/Co 3 O 4 /carbon nanotubes (CNTs)/reduced graphene oxide (RGO) composite with polyhedral structure was prepared by high-temperature pyrolysis of Co-based zeolitic imidazolate frameworks (ZIF 67). The carbon/Co/Co 3 O 4 /CNTs/RGO composite was composed of carbon polyhedrons, in which Co and Co 3 O 4 particles were encapsulated by carbon polyhedrons and CNTs. With a filler ratio of 20 wt%, this absorber displayed the highest reflection loss (R L ) of −59.2 dB at 11.2 GHz with 2.5 mm thickness and the absorption bandwidth (R L exceeding −10 dB) of 5.7 GHz (12.3–18 GHz) with a thickness of only 2 mm. The outstanding microwave absorption performance of this material results from proper impedance matching, synergistic effect, enhanced interfacial polarizations and interior cavities. This strategy may provide guidance for the manufacture of new-type absorbers with high-efficiency characteristics.
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 6
·3287-3300
·
IF 4.21
Zhang Su-Feng,Li Hao,Hou Chen,Liu Li-Na,Wang Yang,Zhao Meng-Ke,Liang Chen
Abstract The treatment of dyes in wastewater is important to solve environmental problems. Advanced oxidation processes has been proved to be an effective treatment. In this work, a novel nanocomposite catalyst of ZIF-9@Fe 3 O 4 (cobalt-containing zeolitic imidazolate framework-9 coated Fe 3 O 4 nanocomposite) modified reduced graphite oxide (RGO) was prepared for the first time and coded as ZIF-9@CA-Fe 3 O 4 /RGO. Then, ZIF-9@CA-Fe 3 O 4 /RGO was immobilized on a cellulose membrane to obtain a composite membrane, which was used as a composite catalyst for activating peroxymonosulfate to degrade methylene blue (MB). The results demonstrated that the composite membrane could efficiently degrade approximately 96% of MB in 9 min without adjusting the initial pH and maintain good catalytic activity even after seven cycles. Furthermore, the composite membrane can be easily separated from the solution at the end of the reaction. This work indicates that the composite membrane has a broad application prospect in industrial applications. Graphic abstract
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ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Hualin Jiang,Lei Tian,Pinghua Chen,Yingchen Bai,Xueqin Li,Hongying Shu,Xubiao Luo
Co 3 O 4 @rGO were facilely prepared by template free self-assemble in this study. The morphology of Co 3 O 4 @rGO was actiniaria-like core-shell structural nanocomposites. The formation mechanism of Co 3 O 4 @rGO core-shell nanocomposite was discussed according to its significant time-dependent morphology evolution course. To evaluate the application potential of Co 3 O 4 @rGO, its adsorption performance toward highly toxic antimony ions were studied. The Co 3 O 4 @rGO nanocomposite exhibit high anti-interference ability and high adsorption ability. The maximum adsorption capacities towards Sb(III) and Sb(V) are 151.04 and 165.51 mg/g, respectively. River water samples containing antimony violating the limit were used to evaluate the practical application of Co 3 O 4 @rGO, and high performance was achieved. The EU and China limits for antimony in drinking water can be met by using mesoporous Co 3 O 4 @rGO treating the actual river water samples with original antimony concentration lower than 50 μg/L. Adsorption isotherm, adsorption kinetics, pH and co-existing ions effects were also studied in details. The results indicate that mesoporous Co 3 O 4 @rGO is an excellent adsorbent for antimony removal. Mesoporous Co 3 O 4 @rGO nanocomposite is a potential candidate for antimony removal from waste water.
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NANO
·
2020
·
IF 1.566
Ying Meng,Shibin Lu,Yaodong Wu,Zhenfa Zi,Yuan Ma,Haisheng Lu,Xuemei Chen,Ziwen Song
In this study, we have successfully synthesized porous CoO–Co@RGO composites using GO and Co-based metal-organic frameworks (MOFs) as precursors. Due to particular structures and advantageous characteristics, the synthesized porous CoO–Co@RGO composites exhibit outstanding electromagnetic (EM) wave absorbing properties with a filler loading of 10 wt.% in wax matrix. The maximum reflection loss (RL) of the prepared porous CoO–Co@RGO was − 3 4 . 2 2 dB with 2.1 mm thickness, and the effective absorption bandwidth as wide as 6.24 GHz (11.76–18 GHz), which covers the full Ku-band. Remarkably, the achieved all values of RL were under − 1 0 dB with 1.0–5.0 mm thickness, the corresponding to bandwidth range can be tuned to 13.84 GHz (4.16–18 GHz). The superior absorbing performance is attributed to suitable magnetic loss, high dielectric loss and large attenuation mainly caused by conduction loss and polarization relaxation.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Usman Farooq,Jingguo Zhuang,Xinhai Wang,Shuguang Lyu
The removal of chlorinated hydrocarbons through heterogeneous catalysts from groundwater has become a valuable approach. However, the synthesis of a highly efficient and persistent material especially for trichloroethane (TCA) removal is still immature . In this study, we prepared polydopamine (PDA) embedded Fe/rGO nanocomposite via pH-induced polymerization of dopamine for the degradation of TCA in sodium percarbonate (SPC) system. The experimental outcomes revealed that PDA decorated Fe/rGO not only enhanced the TCA degradation (98%) more economically but also strengthened the stability and recyclability of catalyst compared to bare Fe/rGO. The TEM, XRD, FTIR, XPS and VSM analyses declared the successful preparation of magnetically separable PDA@Fe/rGO nanocomposite. Furthermore, a higher degradation rate of probe compounds in PDA@Fe/rGO/SPC system indicated that PDA decoration improved the formation of active species due to autoxidation of dopamine and reducing capability of PDA. The impact of solution matrix on PDA@Fe/rGO performance elucidated the effect of various species on degradation. The GCMS, TOC analysis and dechlorination experiments validated the formation of non-toxic products and reasonable TOC and chloride ions removal. The PDA@Fe/rGO catalyst can be recycled for six consecutive cycles retaining a 76% along with abundant availability of Fe 2+ and Fe 3+ species validated using XRD and XPS analysis. The enhanced remediation capacity and improved recyclability of PDA@Fe/rGO nanocomposite can serve as a shining star for the practical application of TCA removal in groundwater.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Na Wang,Wenjing Hou,Yunzhen Chang,Hua Song,Honggang Li,Yanping Li,Gaoyi Han
Flexible energy storage devices attracted extensive attention due to their application in personal wearable electronic products. However, the applications of flexible energy storage devices, especially supercapacitors are limited by their low energy density, because anode materials with large capacitance are scarce for the devices based on aqueous electrolyte. Therefore, developing high-performance anode is an effective way to break through the low energy density of flexible devices. Herein, the electroless plating method was used to prepare a flexible cobalt metal substrate based on carbon cloth (CC). The composite of Co 9 S 8 and reduced oxide graphene (rGO/Co 9 S 8 (rGO)/CC) is prepared by one-step hydrothermal method as a flexible anode with outstanding performance. Benefiting from the high hydrogen storage capacity of rGO/Co 9 S 8 (rGO), only a small amount of anode materials are needed to match the capacity of the cathode material of rGO/Ni 3 S 2 (rGO). The optimized flexible device assembled by using rGO/Co 9 S 8 (rGO) as negative electrode and rGO/Ni 3 S 2 (rGO) as positive electrode shows a high specific capacitance of 192.4 mAh g −1 at the current density of 4.0 A g −1 , large energy density (168.1 Wh kg −1 at 3.5 kW kg −1 ). Furthermore, the network structure of the electrode can provide enough space for the expansion and contraction of the electrode materials during the repeated charging and discharging process, so the device exhibits good cycle stability (the capacitance of the device can retain 84.3% after 6000 cycles). Moreover, the device also exhibits remarkable flexibility. These results reveal that this kind of electrochemical hydrogen storage material can be developed as a promising anode in flexible energy storage devices.
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NANOTECHNOLOGY
·
2019
·Vol. 31
·期 8
·085708
·
IF 3.399
Jialiang Luo,Yubing Hu,Lei Xiao,Guangpu Zhang,Hu Guo,Gazi Hao,Wei Jiang
3D flower-like Fe3S4 microspheres and quasi-sphere Fe3S4-RGO hybrid-architectures were successfully fabricated by a facile template-free hydrothermal method. The results of morphology revealed that the single Fe3S4 was composed of many nanoflakes and the Fe3S4-RGO composites mainly distributed together into a ball up and down the RGO sheet. The electromagnetic parameters of the single Fe3S4 and Fe3S4-RGO composites could be controlled by adjusting different filler loading and the addition of different GO to achieve impedance matching. Both the single Fe3S4 and Fe3S4-RGO composites exhibited an excellent EM absorption ability. The minimum reflection loss (RL) of the single Fe3S4 with 50% filler loading could achieve −66.87 dB at 10.57 GHz for the thickness of 2.2 mm, and the absorption bandwidth (RL < −10 dB) could reach 3.49 GHz. For the Fe3S4-RGO composites, the minimum RL of FSR-1 could be −40.25 dB at 9.67 GHz with the thickness of 2.0 mm. In addition, the effective absorption bandwidth of FSR-2 could reach 3.85 GHz at only 1.45 mm and the minimum RL was −29.25 dB at 14.24 GHz. Consequently, the single Fe3S4 and Fe3S4-RGO composites are promising materials as a high performance and adjustable EM wave absorber.
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