Nanoscale
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2020
·Vol. 12
·期 7
·4374-4382
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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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ENVIRONMENTAL RESEARCH
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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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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
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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CELLULOSE
·
2020
·Vol. 27
·期 6
·3287-3300
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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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SEPARATION AND PURIFICATION TECHNOLOGY
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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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CHEMOSPHERE
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2021
·
IF 7.086
Chao Xue,Wanling Cai,Xiulan Weng,Gary Owens,Zuliang Chen
The use of biomass for the synthesis of value-added products, such as functional nanomaterial for the removal of contaminants, is a challenge. In this study, hybrid bimetallic Fe/Ni nanoparticles and reduced graphene supported bimetallic Fe/Ni nanoparticles (Fe/Ni-rGO) were prepared via a one-step green synthesis using green tea extract, and thereafter evaluated for the simultaneous removal of rifampicin (RIF) and Pb(II) from aqueous solution. The efficiencies of Pb(II) and RIF removal by Fe/Ni-rGO were 87.5 and 96.8%, respectively. The removal performance of the hybrid Fe/Ni-rGO was better than either n Fe/Ni, rGO, or Fe-rGO. Detailed characterization and analyses of Fe/Ni-rGO indicated that both Fe and Ni nanoparticles were evenly distributed over the surface of rGO and that aggregation of Fe, Ni nanoparticles, and stacking of rGO in the hybrid were decreased. Furthermore, while LC-TOF-MS analysis showed that RIF was degraded into small-molecule fragments, XPS showed that Pb(II) was not reduced to Pb 0 . The major conditions impacting removal efficiency, adsorption kinetics, and fit to adsorption isotherm models were examined to better understand the removal mechanism. While the adsorption of both contaminants fit well a pseudo-second-order kinetic model, the adsorption of RIF fit the Freundlich isotherm model best, while the adsorption of Pb(II) fit the Langmuir isotherm model best. Thus, the removal mechanism of both contaminants firstly being chemical adsorbed onto the surface, while n Fe/Ni continues to participate in the catalytic reduction of RIF. Moreover, Fe/Ni-rGO could be reused and performed well for wastewater treatment , thus suitable as a practical resource recycling technology .
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RSC Advances
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2019
·Vol. 9
·期 52
·30439-30447
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IF 3.049
Yongsheng Wang,Zhenzhen Zhao,Yunlu Zhao,Xiaolin Lan,Weixiang Xu,Li Chen,Dongjie Guo,Zhengkang Duan
The sintering resistance of supported Cu nanoparticle (NP) catalysts is crucial to their practical application in the dehydrogenation of diethanolamine (DEA). In this paper, co-precipitation, hydrothermal synthesis, and sol–gel condensation are used to form a new support material through chemical bonding between graphene oxide and ZrO2. The composite carriers prepared by the three methods are mixed with copper nitrate and ground using a ball mill. A series of Cu/ZrO2-reduced graphene oxide (RGO) composites were prepared by calcination under nitrogen at 450 °C for 3 h and hydrogen reduction at 250 °C for 4 h. The conversion of DEA to iminodiacetic acid (IDA) reached 96% with the Cu/ZrO2-RGO catalyst prepared by hydrothermal synthesis. The conversion rate of DEA is more than 80% following the reuse of the CZG-2 catalyst for twelve cycles. The various physicochemical characterization techniques show that the Cu/ZrO2-RGO layered and wrinkled nanostructures can improve catalytic stability and suppress the sintering of the supported Cu NPs during the catalytic dehydrogenation of diethanolamine. A synergistic effect between the RGO and the Cu nanoparticles is observed. The Cu nanoparticles with RGO have a better dispersibility, and a new nano-environment is created, which is the key to improving the efficiency of diethanolamine dehydrogenation. These new Cu/ZrO2-RGO catalysts show increased durability compared to commercially produced Cu/ZrO2 catalysts and show promise for practical applications involving diethanolamine dehydrogenation.
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Chemistry-An Asian Journal
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2019
·Vol. 14
·期 19
·3431-3441
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IF 3.698
Wanli Zhang,Siying Huo,Siyuan Yang,Yongming Zhong,Shengsen Zhang,Hongqiang Wang,Xinhua Zhong,Yueping Fang
Graphical Approaching a junction : A monolithic photomembrane by the judicious integration of ZnS/CdS heterojunction nanorods and multilayer graphene sheets has been fabricated and used as monolithic photocatalyst or a freestanding photoanode for efficient hydrogen evolution. Its outstanding performance can be attributed to the efficient charge separation/transfer brought by its unique structural characteristics. Highly efficient and easy recyclable monolithic photocatalysts with ideal separation/transport route for photogenerated charge carriers are much desired. In this work, a ZnO seed-induced growth approach is developed to fabricate a ternary monolithic photomembrane, that is, ZnS/CdS heterojunction nanorods in situ grow into the interspaces of multilayer reduced graphene oxide (rGO) sheets (denoted as ZnS/CdS/rGO). The monolithic ZnS/CdS/rGO photomembrane can serve as an efficient visible-light photoactive membrane for photocatalytic (PC) or photoelectrochemical (PEC) hydrogen generation. The fast electron transport of 1D CdS nanorods, the excellent electronic conductivity of multilayer stacked rGO sheets, the intense visible-light absorption of CdS, the unique hierarchical structure, and double heterojunctions (ZnS/CdS and CdS/rGO) efficiently boost the photogenerated electron-hole pairs separation and transfer across the interfacial domain of the photomembrane under visible-light irradiation. Furthermore, the superior stability and reusability of the photomembrane is achieved by the ideal process of photogenerated electron-hole pair separation/transfer, i.e., holes transfer to ZnS and electrons transfer to rGO to inhibit CdS from photocorrosion.
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Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Yaqi Hou,Shengyan Pu,Qingqing Shi,Sandip Mandal,Hui Ma,Shengyang Xue,Guojun Cai,Yingchen Bai
New approaches and practices to improve photocatalytic efficiency of materials for remediation of organic and inorganic pollutant has become a top priority. We have developed a graphene-oxide based ternary composite Ag/TiO 2 /rGO as a green catalyst, and the photocatalytic oxidation and reduction efficiency of the catalyst was thoroughly evaluated for Cr(VI) and tetracycline (TC) remediation in water as potential contaminants. The results suggested that the electronic coupleing system exhibits excellent photocatalytic activity, mainly due to affecting light absorption and higher e − / h + separation efficiency. The photocatalytic activity of the silver-deposited graphene-supported silver and titanium dioxide was 4.3 and 2.5 times for Cr (VI) and TC remediation, respectively. Furthermore, the service life of the photocatalyst was also evaluated within five recycling studies, indicating that the efficiency of the obtained photocatalyst was maintained above 80%. Electron paramagnetic resonance spectroscopy and the addition of free radical scavengers confirmed that e − act as reducing agents and may be the key (O 2 ·− ) to the degradation process. The photocatalytic mechanism was proposed based on the studies obtained. Green catalysts based on graphene-based ternary composites developed in this work can provide effective and economic remediation at higher scale and offer practical application of photo catalysis technology.
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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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ELECTROCHIMICA ACTA
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2019
·
IF 5.383
Junying Huang,Mengting Chen,Xiaojun Li,Xiaowen Zhang,Liyun Lin,Weipeng Liu,Yingju Liu
Molybdenum disulfide (MoS 2 ), although considered as a promising transition metal dichalcogenides catalyst, owns low plane conductivity that limits its effective application. In this work, we grew monodispersed MoS 2 nanoflakes on reduced graphene oxide (rGO), and then assembled the resulting MoS 2 -rGO with carbon nanotubes (CNTs) in a layer-by-layer manner to form the MoS 2 -rGO-CNTs composite. The CNTs spacing layer not only reduces the whole catalytic material's resistance by bridging different broken MoS 2 -rGO nanosheets , but also constructs a three-dimensional structure to prevent 2D MoS 2 -rGO nanosheets restacking and thus increases the active sites. Such three-dimensional MoS 2 -rGO-CNTs catalyst exhibited a low Tafel slope of 39 mV dec −1 and a high current density of 1200 mA cm −2 at −400 mV. Therefore, our study showed a cheap and simple method to combine three-dimensional hybrid material, facilitating the large-scale application of non-noble catalyst.
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TALANTA
·
2019
·
IF 4.916
Xueliang Liu,Xinhuan Wang,Qiusen Han,Cui Qi,Chen Wang,Rong Yang
In this work, we reported a novel nanozyme synthesized by decorating highly dispersed ultrafine IrO 2 nanoparticles on reduced graphene oxide (rGO) nanosheets via a simple hydrothermal method . The as-prepared IrO 2 /rGO nanocomposites exhibited intrinsic peroxidase-like activity and could catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to produce blue product in the presence of H 2 O 2 . Catalytic kinetic of IrO 2 /rGO nanocomposites followed Michaelis-Menten behavior, exhibiting a higher affinity to TMB than horseradish peroxidase (HRP) enzyme. Catalytic mechanism studies suggested that the peroxidase-like activity of IrO 2 /rGO nanocomposites originated from their ability of electron transfer between substrate and H 2 O 2 . On the basis of high peroxidase-like activity of IrO 2 /rGO nanocomposites, a colorimetric strategy for rapid and sensitive detection of low weight biothiols was developed. The colorimetric detection assays for low weight biothiols showed high selectivity against other amino acids . Therefore, the IrO 2 /rGO nanozyme is expected for promising potential applications in the biosensor, diagnostics and environment.
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