ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
·
IF 6.653
Haiguang Zhang,Xie Quan,Shuo Chen,Xinfei Fan,Gaoliang Wei,Hongtao Yu
Nanofiltration (NF) has received much attention for wastewater treatment and desalination. However, NF membranes generally suffer from the trade-off between permeability and selectivity. In this work, the coenhancement of permeability and ion selectivity was achieved through tuning the surface charge and pore size of oxidized carbon nanotube (OCNT) intercalated reduced graphene oxide (RGO) membranes. With the increase of OCNT content from 0 to 83%, the surface charge and the pore size were increased. The permeability increased to 10.6 L m–2 h–1 bar–1 and rejection rate reached 78.1% for Na2SO4 filtration at a transmembrane pressure of 2 bar, which were 11.8 and 1.3 times higher than those of pristine RGO membrane. The composite membrane also showed 11.1 times higher permeability (11.1 L m–2 h–1 bar–1) and 2.9 times higher rejection rate (35.3%) for NaCl filtration. The analyses based on Donnan steric pore model suggest that the increased permeability is attributed to the combined effects of enlarged pore size and increased surface charge, while the enhanced ion selectivity is mainly dependent on the electrostatic interaction between the membrane and target ions. This finding provides a new insight for the development of high-performance NF membranes in water treatment and desalination.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xiufen Hu,Fang Deng,Weiya Huang,Guisheng Zeng,Xubiao Luo,Dionysios D. Dionysiou
ZnS-MoS 2 solid solution anchored on reduced graphene oxide sheet (rGO/ZnS-MoS 2 ) was explored as novel visible-light-driven photocatalysts, and synthesized by solvent thermal method. The light absorption intensity of rGO/ZnS-MoS 2 was greatly strengthened, and rGO/ZnS-MoS 2 possess modulated continuous band gaps from 3.47 to 3.56 eV by changing the Zn/Mo ratios and rGO content. Their photocatalytic activities for 2-nitrophenol degradation are dependent on the chemical composition, and the optimal 11% rGO/ZnS-MoS 2 possessed the highest photocatalytic performance, which could be attributed to the most efficient charge separation, the largest specific area, and its optimized band structure. Moreover, 11% rGO/ZnS-MoS 2 can effectively treat real industrial effluent with 74.05% COD removal, and maintain long-term stability without obvious decline after five use cycle.
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2018
·
IF 1.1
Xuehua Liu,Bingning Wang,Jine Liu,Zhen Kong,Binghui Xu,Yiqian Wang,Hongliang Li
A one-step high-temperature solvothermal approach to the synthesis of monolayer or bilayer MoS 2 anchored onto reduced graphene oxide (RGO) sheet (denoted as MoS 2 /RGO) is described. It was found that single-layered or double-layered MoS 2 were synthesized directly without an extra exfoliation step and well dispersed on the surface of crumpled RGO sheets with random orientation. The prepared MoS 2 /RGO composites delivered a high reversible capacity of 900 mAhg − 1 after 200 cycles at a current density of 200 mAg − 1 as well as good rate capability as anode active material for lithium ion batteries. This one-step high-temperature hydrothermal strategy provides a simple, cost-effective and eco-friendly way to the fabrication of exfoliated MoS 2 layers deposited onto RGO sheets.
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2018
·Vol. 7
·期 5
·1800940
·
IF 3.175
Maofeng Zhang,Wenzhen Liu,Ran Han,Jun Xu,Zhenjie Sun,Jiaqin Liu,Yucheng Wu
The synthesis of an efficient and economically viable supercapacitor material with a large areal capacitance for miniaturized consumer electronics is still a major challenge. Herein, densely packed 3D flower-like NiCo 2 O 4 @NiMoO 4 /reduced graphene oxide (rGO) composites on Ni foam which can be directly utilized as a supercapacitor material are demonstrated. The overall electrochemical performance can be significantly enhanced by an increase in the packing density of 3D flower-like structure, highly porous spatial construction, and the synergistic effects of the three materials, which generates a larger areal capacitance of 9.41 F cm −2 and a superior cycling stability with 75% areal capacitance retention after 2000 charge–discharge cycles. This simple and low-cost supercapacitor material may have potential applications in energy storage devices.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Hao Jiang,Xia Zhang,Wen Gu,Xiaoqian Feng,Lei Zhang,Yijin Weng
Novel ZnO particles with hierarchical and biomorphic porous microstructures were first synthesized through a bionic method and the individual ZnO, pine cones-like ZnO/rGO composites were prepared via ‘one-pot’ solvothermal route. All of above samples are characterized by SEM, XRD, Raman spectrometer and XPS. The results of degradation of rhodamine B indicated that ZnO/leaf exhibited better photocatalytic properties than individual ZnO, the ZnO/rGO with ZnO/rGO ratios at 20:1 shows the best photocatalytic performance. Results indicate that both the morphology design of ZnO through a bionic method and graphene doping can enhance the photocatalytic performance of zinc oxide.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 41
·21998-22004
·
IF 5.968
Gong Cheng,Yan-Lin Liu,Zhi-Gang Wang,Ji-Lin Zhang,De-Hui Sun,Jia-Zuan Ni
The graphene oxide (GO)–Fe3O4 and the reduced graphene oxide (rGO)–Fe3O4 composites with good water dispersibility, high affinity and rapid magnetic response have been prepared via a facile grafting method. They can be used for the effective immobilization of proteins and the enrichment of peptides, respectively. By taking advantage of the high loading capacity and the abundant hydrophilic groups of the GO–Fe3O4 composites, they can be applied to immobilize proteins. The amount of loading of protein (BSA) on GO–Fe3O4 is as high as 294.54 mg g−1. The rGO–Fe3O4 composites can be used to enrich the low-concentration peptides conveniently due to their high surface areas, special structures and strong magnetism. Nineteen target peptides with the sequence coverage of 21% can be enriched and detected from the highly diluted digest of BSA (5 fmol μL−1). These results reveal that the prepared GO/rGO–Fe3O4 composites have potential application as a carrier for biomolecule immobilization, enrichment, and separation.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 83
·67951-67961
·
IF 3.84
Jin Zhu,Zimo Lou,Yu Liu,Ruiqi Fu,Shams Ali Baig,Xinhua Xu
Iron–manganese binary oxide (FeMnOx) is considered highly effective for arsenic adsorption, however, the agglomeration effect hindered its practical application. In this study, graphene has been used as a supporting matrix to disperse FeMnOx due to its huge specific surface area, and the synthesized novel composite adsorbent (FeMnOx/RGO) was employed for arsenic removal. Results demonstrated that FeMnOx/RGO (mass ratio of FeMnOx to FeMnOx/RGO nanocomposites is 45%) has larger specific surface area (411 m2 g−1) in comparison with bare FeMnOx, and showed 10.16 mg As g−1 FeMnOx and 11.49 mg As g−1 FeMnOx adsorption capacities for As(III) and As(V), respectively, with 1 mg L−1 initial concentration. Increased in the initial concentration to 7 mg L−1, the adsorption capacities of As(III) and As(V) reached to 47.05 mg As g−1 FeMnOx and 49.01 mg As g−1 FeMnOx, respectively. The removal process perfectly obeys pseudo second-order kinetic model for both As(III) and As(V). And PO43− was found to strongly inhibit arsenic adsorption. Furthermore, adsorption tests and characterization analyses confirmed that MnO2 played a key role on the oxidation of As(III), while iron(III) oxide was found crucial to As(V) removal. Electrostatic interaction and surface complexation mechanisms involved in the adsorption. These findings suggested that the adsorbent could be used in real arsenic-contaminated water treatment.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yidi Wang,Bowen Li,Guanshu Li,Xue Ma,Hongbo Zhang,Yingying Huang,Guowei Wang,Jun Wang,Youtao Song
Z-scheme structure is an effectively construction to improve the photocatalytic activity due to the excellent photo-generated electron-hole pairs separation efficiency. In this paper, the Er 3+ :YAlO 3 @(PdS/BiPO 4 )/(Au/rGO), (Au/rGO)/CdS and modified Z-scheme Er 3+ :YAlO 3 @(PdS/BiPO 4 )/(Au/rGO)/CdS photocatalysts were prepared by hydrothermal, ultrasonic dispersion, deposition-precipitation and ultrasonic-assisted methods. The prepared samples were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectra (DRS), fourier transform infrared spectra (FT-IR), raman spectra and photoluminescence (PL) spectra. The photocatalytic activity of prepared samples were evaluated via photocatalytic conversion rate of nitrite under ultraviolet-light and simulated solar-light irradiations. Due to the enhanced separation efficiency of electron-hole pairs, the Er 3+ :YAlO 3 @(PdS/BiPO 4 )/(Au/rGO)/CdS exhibited excellent performance under both ultraviolet-light and simulated solar-light irradiation, reaching 94.59% and 91.25% conversion rates, respectively. Meanwhile, the effects of simulated solar-light irradiation time and corresponding reaction kinetics on photocatalytic conversion of nitrite were studied. Subsequently, the effects of electron and hole scavengers were investigated to further elaborate the possible mechanism. In addition, the study of used times showed that the prepared modified Z-scheme Er 3+ :YAlO 3 @(PdS/BiPO 4 )/(Au/rGO)/CdS nanocomposites can be effectively recycled without an apparent inactivation on photocatalytic activity. This research may provide a potential way by utilizing solar energy efficiently for converting nitrite and other contaminants released into the environment.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Zhen Liu,Jingkun Xu,Ruirui Yue,Taotao Yang,Lei Gao
This paper demonstrates that Au–PEDOT/reduced graphene oxide nanocomposite (Au–PEDOT/rGO) can be rapidly synthesized through a facile, cost-effective one-pot method with chloroauric acid as the oxidant and NaBH 4 as the reductant successively. The morphology, composition and structure of the obtained composites were confirmed by SEM, TEM, XRD, Raman and XPS characterizations. The Au–PEDOT/rGO modified glassy carbon electrode (GCE) showed significantly improved charge transfer efficiency and high electrocatalytic activity toward caffeic acid (CA) oxidation as compared to bare GCE and Au-PEDOT modified electrode. Under optimized conditions, the Au–PEDOT/rGO constructed sensors exhibited a wide linear range of 0.01–46 μM with the correlation coefficient of 0.9926 and a detection limit as low as 0.004 μM for the detection of CA. To validate its possible application, the present sensor was also illustrated with satisfactory anti-interference performance, high reproducibility and sensitivity for the determination of CA in red wine sample. The prepared Au–PEDOT/rGO nanocomposite is a promising electrode material for the determination of CA in red wines or other CA-containing food and beverage.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Ying-Hua Zhou,Suqin Wang,Yu Wan,Jingjing Liang,Yu Chen,Shizhong Luo,Cheng Yong
Low-cost metallic nanoparticles as catalysts with good performance are highly desired for the development of hydrogen storage materials . In this work, ceria-doped CuNi nanoparticles were successfully immobilized on the surfaces of reduced graphene oxide (rGO) by a simple co-reduction approach in aqueous solution at room temperature, characterized by ICP-OES, XRD , TEM, SEM-EDS and XPS techniques. The as-synthesized CuNi-CeO 2 /rGO nanocomposites with various metal contents had been employed as heterogeneous catalysts for the hydrolytic dehydrogenation of ammonia borane (NH 3 BH 3 , AB) under mild conditions. The optimal catalyst of Cu 0.8 Ni 0.2 -CeO 2 /rGO with CeO 2 content of 13.9 mol% exhibited an excellent catalytic activity with the exceedingly high TOF value of 34.4·mol H2 ·mol catalyst −1 ·min −1 at 298 K. The apparent activation energy was calculated to be 19.1 kJ mol −1 , even lower than most of noble-metal-based catalysts for AB dehydrogenation. The detailed kinetics of AB hydrolysis catalyzed by Cu 0.8 Ni 0.2 -CeO 2 /rGO had been investigated on different concentrations of catalyst, substrate and temperatures. Moreover, the obtained in situ hydrogen from AB hydrolysis can be further applied to reduce 4-nitrophenol with a high TOF value of 8.1 min −1 at room temperature. The high catalytic activity of Cu 0.8 Ni 0.2 -CeO 2 /rGO would be contributed to the small size of CuNi-CeO 2 NPs, metal-metal synergy, and the metal-support interaction.
✓ 已验证
产品关联
DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2016
·Vol. 34
·期 3
·1600233
·
IF 4.367
Yanzhou Jiang,Yan Gu,Guangdi Nie,Maoqiang Chi,Zezhou Yang,Ce Wang,Yen Wei,Xiaofeng Lu
In this paper, a novel strategy for the fabrication of reduced graphene oxide (rGO)/Cu 8 S 5 /polypyrrole (PPy) composite nanosheets with Cu 8 S 5 nanoparticles and PPy layer anchored on the surface of rGO as peroxidase-like nanocatalyst is reported. During the synthesis, graphene oxide (GO)/CuO composite nanosheets are prepared first and used as templates, then the sulfuration of CuO and polymerization of pyrrole are accompanied with the reduction of GO, resulting in ternary rGO/Cu 8 S 5 /PPy composite nanosheets. The synthesized Cu 8 S 5 nanoparticles with a diameter in the range from tens to hundreds of nanometers are dispersed within PPy decorated rGO nanosheets. The resultant ternary rGO/Cu 8 S 5 /PPy composite nanosheets exhibit a higher peroxidase-like catalytic activity toward the oxidation of 3,3′,5,5′-tetramethylbenzidine in the presence of H 2 O 2 than GO/CuO and rGO/CuS composite nanosheets, revealing a synergistic effect on their activity. The as-prepared rGO/Cu 8 S 5 /PPy platform provides a simple colorimetric approach for the detection of H 2 O 2 and phenol with a high sensitivity. This work offers a new way for the fabrication of rGO-based nanocomposite with superior enzyme-like activity, which displays great potential applications in biocatalysis and environmental monitoring.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Yuting He,Yongjin Zou,Cuili Xiang,Fen Xu,Yongpeng Xia,Yulian Chen,Shunxiang Wang,Zhicong Hu,Sijia Hao,Lixian Sun
Shape-stabilized composite phase change materials (CPCMs) with high photothermal conversion efficiency, high thermal storage capacity, and excellent thermal conductivity hold immense potential for diverse applications and market growth. This study employed a one-step substitution reaction followed by a thermal reduction technique to successfully affix Ni and Cu nanoparticles onto reduced graphene oxide (rGO) nanosheets , which were subsequently integrated into a nickel foam (NF) matrix. This process resulted in the fabrication of an NF/Ni-Cu@rGO porous carrier, facilitating the adsorption of polyethylene glycol (PEG) and the formation of CPCMs. Introducing Ni-Cu@rGO into the NF matrix enhanced the carrier framework, enabling improved PEG loading and leakage prevention. The hybridization of Ni-Cu@rGO effectively bolstered the interaction between the carrier framework and the phase change material (PCM), resulting in enhanced phase change performance. CPCMs prepared from the NF/Ni-Cu@rGO framework exhibited superior shape stability, higher thermal storage density, and enhanced recyclability than pure PCMs. Optimized CPCMs displayed melting and crystallization enthalpies of 121.13 J·g −1 and 113.44 J·g −1 , respectively. The thermal conductivity of NF/Ni-Cu@rGO/PEG CPCMs significantly improved to 0.4780 W·m −1 K −1 , representing a remarkable 315 % increase over that of PEG alone. Furthermore, the NF/Ni-Cu@rGO/PEG composite demonstrated outstanding photothermal conversion efficiency, thermal cycling stability, and exceptional shape stability. These findings offer promising prospects for its application across various fields.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）