SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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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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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2021
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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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CATALYSIS LETTERS
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2021
·Vol. 151
·期 11
·3170-3188
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IF 3.186
Zhang Qian,Zhou Yu-lian,Wang Bao-zong,Hong Jun-ming
The performance of electrocatalytic-oxidation process depends on the anode characteristics, so the preparation of active anode materials is an attractive method to enhance the efficiency of this process. However, the high catalytic properties of graphene and its derivatives have been well confirmed, an efficient method of controlling catalytic activity and stability remains to be established. In this research, the relationship between the precursor and catalytic performance was clarified by regulating the oxygen-containing groups in the precursor. Results indicated that the surface O groups on the precursor were sensitive to controlling the catalytic activity and stability of tri-doped reduced graphene oxide (RGO). With more O groups in the precursor (catalysts from graphene oxide), the doped heteroatom species is vulnerable involved into reaction, leading to the flaking of active sites, and ultimately decreasing the activity and stability performance. By contrast, the fewer O groups in the precursor (catalysts from RGO) created stable and active defects for oxidation activity. The interactions of O groups in the C precursor with those in the heteroatom precursor were further confirmed by DFT calculations. The findings of this research presented a new strategy for controlling the stability and performance of the resulting catalysts. Graphic Abstract DEME-TFSI-coated GO and GN are first formed via covalent bonds through functional groups (O groups) on the graphene surface, non-covalent ionic bonds, and π–π stacking interactions. In this step, N, S, and F groups are weakly bonded with graphene. Stable pyridine and pyrrole structures could then be generated via dehydration and decarbonylation under a controlled temperature and pressure in the hydrothermal process. Finally, cyclization rearrangement is carried out to form graphite with a tri-doped structure.
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高影响因子
APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Zhongji Qu,Yu Wang,Wei Wang,Dan Yu
The fabrication of flexible microwave absorbers with high-performance has become an arduous challenge for applications of anti-electromagnetic pollution and radar stealth technology. Herein, a series of FeCoNiOx-PDA-rGO absorbers were prepared and coated on the surface of pretreated polyimide (PI) fabric with PDA-rGO, and finally by screen printing FeCoNiOx-PDA-rGO/WPU for acquiring robust microwave absorption performance, in which the first layer of treated PI fabric was used as the microwave-reflection layer, the medium microwave absorbing powder and water-based polyurethane (WPU) hybrid coating served as the microwave-absorbing layer, and the outside hydrophobic polydimethylsiloxane (PDMS) layer was utilized as the microwave-transmission layer. The well-designed microwave absorption fabric exhibits excellent performance in the X-band (8.2–12.4 GHz). The minimum reflection loss (RL min ) value of the designed fabric can reach −74.70 dB with a thickness of 3.97 mm. Meantime, almost in the entire X-band, the sample can absorb more than 99% (RL < -20 dB) of incident electromagnetic waves. Besides, the performance can be adjusted by changing the load rate of each microwave absorbing layer to obtain lighter and thinner samples in practical applications. We believe this work will bring new inspiration to the design of flexible and wearable microwave absorbers.
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CELLULOSE
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2021
·Vol. 28
·期 7
·4439-4453
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IF 5.044
Zhang Shichen,Xu Jiangtao,Sun Yue
Pressure sensors were fabricated based on porous polymer films coated onto cotton fabric modified with reduced graphene oxide (rGO). The cotton fabric was modified with a silane coupling agent to improve the adhesion between the cotton fabric and rGO. The porous structure was constructed to enlarge the surface area of the coating polymer. The fabrication process was characterized with Fourier Transform Infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and Raman spectrometry. Owing to the materials and constructed porous structure, the prepared devices (1 × 2 cm 2 ) showed an excellent electric output with a voltage of 132 V and an outstanding linear relationship of applied forces and frequencies with values of adjusted R 2 over 0.97. In practical detection of human motion, the prepared pressure sensor gave clear signals for each step during the walking, jumping and running. Graphic abstract
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
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IF 4.464
Shanshan Wei,Haolin Xiao,Miao Gu,Zhencheng Chen,Liangli Cao
In this study, a sensitive and quantitative label-free electrochemical immunosensor based on bimetallic [email protected] nanoparticles , Prussian blue (PB), and reduced graphene oxide-tetraethylene pentamine nanocomposite (rGO-TEPA) was constructed to achieve sensitive detection of HBsAg. A one-pot green method was used to synthesize interlocked rGO-TEPA/PB hybrid composites as high-performance materials with good conductivity . PB was the electron transfer mediator used to provide electrochemical signals. By utilizing rGO-TEPA as supporting material , the stability and intensity of PB were greatly improved. The incorporation of highly conductive [email protected] nanoparticles could further amplify the electrochemical signal, and the high adsorption capacity could provide an efficient substrate for hepatitis B surface antibody (HBsAb) immobilization. Under optimal conditions, the immunoassay had a wide linear range from 0.25 pg mL −1 to 400 ng mL −1 and a low detection limit of 0.08 pg mL −1 (S/N = 3). This method was also applied to the analysis of human serum samples, and the obtained results were on par with those of electrochemiluminescence immunoassay (ECLIA), suggesting significant potential for this new method in clinical research.
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Nano Research
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2021
·Vol. 14
·期 12
·4696-4703
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IF 8.897
Sun Xiuping,Wang Lu,Li Chuanchuan,Wang Debao,Sikandar Iqbal,Man Ruxia,Tian Fang,Qian Yitai,Xu Liqiang
Sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) have been considered as attractive alternatives for next-generation battery systems, which have promising application potential due to their earth abundance of potassium and sodium, high capacity and suitable working potential, however, the design and application of bi-functional high-performance anode still remain a great challenge up to date. Bismuth sulfide is suitable as anode owing to its unique laminar structure with relatively large interlayer distance to accommodate larger radius ions, high theoretical capacity and high volumetric capacity etc. In this study, dandelion-like Bi 2 S 3 /rGO hierarchical microspheres as anode material for PIBs displayed reversible capacity, and 206.91 mAh·g −1 could be remained after 1,200 cycles at a current density of 100 mA·g −1 . When applied as anode materials for SIBs, 300 mAh·g −1 could be retained after 300 cycles at 2 A·g −1 and its initial Coulombic efficiency is as high as 97.43%. Even at high current density of 10 A·g −1 , 120.3 mAh·g −1 could be preserved after 3,400 cycles. The Na 3 V 2 (PO 4 ) 3 @rGO//Bi 2 S 3 /rGO sodium ion full cells were successfully assembled which displays stable performance after 60 cycles at 100 mA·g −1 . The above results demonstrate that Bi 2 S 3 /rGO has application potential as high performance bi-functional anode for PIBs and SIBs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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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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NANO
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2020
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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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EUROPEAN POLYMER JOURNAL
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2020
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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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MATERIALS & DESIGN
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2017
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IF 4.364
Xiu Liu,Lei Huang,Dengsong Zhang,Tingting Yan,Jianping Zhang,Liyi Shi
This work reports the synthesis of highly dispersed Mn-Co/RGO via a novel light driven approach having attributes of being green, facile and controllable, for the catalytic degradation of methylene blue (MB) in the presence of H 2 O 2 . The prepared catalysts were characterized by TEM, EDS , IR, XRD and XPS techniques. A synergy between RGO and Mn-Co species existed where the former helped in adsorption of MB and stabilization and dispersion of Mn and Co on the surface while the latter improved H 2 O 2 utilization by generating HO , which enhanced the decomposition of MB. It was found that O 2 •− and O 2 •− /HO • were the main radicals in post Mn/RGO and Mn-Co/RGO treatment, respectively. Both O 2 •− and HO • oxidized MB with a faster rate by the former, but its side reaction can hinder effective utilization of H 2 O 2 while the reverse was true for the latter. A 50 mg/L MB was completely decomposed within 15 min using 10 mg of Mn-Co/RGO. Thus the synergistic effect of RGO by adsorption MB and Co species avoiding the side reaction led to enhanced rate of MB decomposition.
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高影响因子
ELECTROCHIMICA ACTA
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2020
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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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