MICROCHEMICAL JOURNAL
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2020
·
IF 3.594
Yiju Song,Kaihang Cao,Wenjun Li,Chaoyun Ma,Xiuwen Qiao,Hongling Li,Chenglin Hong
A three-dimensional array of reduced graphene oxide/MoS 2 @ polyaniline-layered nanosheets (denoted as rGO/MoS 2 @ PANI) has a novel structure of intercalated MoS 2 /PANI nanosheets arrays arranged on rGO that can be used as carcinoembryonic antigen (CEA) electrochemical immunosensors (detectors). In this graded nanosheet, the PANI was embedded in the MoS 2 interlayer. The MoS 2 /PANI nanosheets themselves limit volumetric changes when arranged as MoS 2 /PANI nanosheet arrays on rGO nanosheets to provide tight and sufficient heterogeneity. PANI locates on the interface itself and contains a large amount of –NH 2 that can bind many antibodies. Simultaneously, we investigated the optimal amount of aniline to add. We found that these arrays had excellent film thickness and conductivity for improving CEA detection sensitivity. The tested immunosensor achieved sensitive and specific detection of CEA, with a detection limit of 0.3 pg mL −1 . Under the optimal conditions, the prepared immunosensor exhibited acceptable reproducibility and selectivity and excellent stability. Satisfactory results of human serum samples indicated the potential application of the immunosensor for clinical monitoring of tumor markers.
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高影响因子
TEXTILE RESEARCH JOURNAL
·
2021
·
IF 1.82
Wenjun Li,Hui Zhang,Tianyu Chen,Limeng Yang,Cuihong Sheng,Hailiang Wu,Ningtao Mao
The self-cleaning textiles coated with reduced graphene oxide-titanium dioxide (TiO2) nanocomposites have enhanced photocatalytic activities and could have great potential in practical applications. However, it is still problematic regarding how to avoid aggregation of reduced graphene oxide nanosheets in producing reduced graphene oxide-TiO2 nanocomposites. In this research article, we propose a new method to reduce the aggregation of reduced graphene oxide nanosheets in producing cotton fabrics coated with reduced graphene oxide-TiO2 nanocomposites by combining vibration-assisted ball milling and hydrothermal synthesis process. The microstructure and photocatalytic-related properties of the resultant reduced graphene oxide-TiO2 nanocomposites and their coating cotton fabrics were characterized by using a series of techniques including field emission scanning electron microscope (FESEM), atomic force microscope (AFM), X-ray diffraction spectroscopy (XRD), Raman, particle size distribution, Brunauer-Emmett-Teller,(BET), transmission electron microscope (TEM), X-ray photoelectron spectrometer (XPS), diffuse reflectance spectra (DRS), ultraviolet photoelectron spectroscope (UPS), and photoluminescence (PL). It was indicated that the aggregation of reduced graphene oxide nanosheets in reduced graphene oxide-TiO2 nanocomposites was successfully avoided via ball milling in the presence of tetrabutyl titanate. After hydrothermal treatment, the resulting reduced graphene oxide-TiO2 nanocomposites were firmly immobilized on cotton fabric. It was demonstrated in the self-cleaning experiments that the resultant self-cleaning cotton fabrics are hydrophilic and could directly decompose color contaminants such as methylene blue, Congo red, and coffee stains under simulated sunlight irradiation due to the photo-degradation reactions of the reduced graphene oxide-TiO2 nanocomposite coating. The reduced graphene oxide-TiO2 nanocomposite-modified cotton fabric also exhibited excellent performance in both robust abrasion resistance and soap-washing resistance. The fabric photocatalytic self-cleaning capability was not found to decrease significantly after being repeatedly used for five times.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Ning Li,Wenyi Wang,Chao Ma,Liuyong Zhu,Xingyu Chen,Bingjie Zhang,Chongli Zhong
Ultrafiltration membranes have shown remarkable potential in the purification of textile printing and dyeing wastewater. However, ultrafiltration membranes have some disadvantages in wastewater treatment , such as membrane fouling and trade-off effect. Hence, a novel polysulfone (PSF)-reduced graphene oxide (rGO)-zinc oxide (ZnO) composite conductive ultrafiltration membrane was prepared via the simple and green method. The combination of conductive ultrafiltration membrane and external electric field could treat dye wastewater. The conductive rGO/ZnO/PSF membranes have high water flux (296 L m −2 h −1 Bar −1 ) and favorable removal rates (>90%) for Congo Red (CR), Methyl Orange (MO), and Methylene Blue (MB). Besides, rGO/ZnO/PSF membrane also showed excellent antifouling ability, which had a flux recovery rate of 93% after filtration of bovine serum albumin (BSA) under applied electric field. Due to the electrocatalytic cleaning, rGO/ZnO/PSF membrane exhibited a 90% flux recovery after filtering the dye. The rGO/ZnO/PSF membrane has good separation efficiency, electrocatalytic stability, and fouling resistance, and can effectively solve the purification of textile printing and dyeing.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Boqiu Luo,Yiran Han,Tingting Yang,Junyou Li,Hao Wang,Wenjing Chen,Xiaoke Li
Strong solar capture and high heat transfer are extremely vital for designing solar-to-heat absorber to improve photo-thermal conversion efficiency in direct absorption solar collectors (DASCs). In this paper, the plasmonic nanofluids containing reduced graphene oxides (rGO) decorated with titanium nitride (TiN) nanoparticles were prepared. Their superior solar-thermal conversion efficiency and heat transfer property was based on the synergy between the Localized Surface Plasmon Resonances (LSPR) effect of TiN and the high thermal conductivity of rGO. The optical properties of plasmonic nanofluids were investigated with the concentration and penetration depth, which indicated that the existence of TiN on graphene could improve the light-capture ability. The results indicated that the TiN@rGO plasmonic nanofluids could be used for DASCs applications, even under the low mass concentrations. Specifically, the maximum photo-thermal conversion efficiency of the plasmonic nanofluids was 66.74% at 40 ppm concentration, which was about 23% higher than that of pure water. And, the experimental results show that the photothermal conversion efficiency will be reduced if the nanofluid concentration is higher than the optimal concentration. This work exhibited the potential application of plasmonic-graphene nanofluids in DASCs.
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ENERGY & FUELS
·
2021
·
IF 3.605
Yunfei Yan,Chenghua Zhang,Tao Jia,Haojie Li,Kaiming Shen
Aimed at achieving high efficiency of photocatalytic hydrogen production from ammonia borane (NH3BH3, AB), a reduced graphene oxide (rGO)-modified TiO2 photocatalyst was proposed for hydrogen production. In this study, rGO/TiO2 photocatalysts with different rGO contents were prepared and characterized by XRD, UV–vis DRS, FTIR, Raman, and SEM. The experimental results showed that addition of rGO can reduce the band gap energy of TiO2, and the band gap energy of rGO/TiO2 varies with the content of rGO, and 1% rGO/TiO2 has the lowest band gap energy of 2.96 eV. This indicates that the modification of TiO2 by rGO not only increases the probability of electron transition but also promotes the separation of photoelectron and hole pairs due to the good conductivity of rGO so as to improve the quantum efficiency of photocatalysis. In addition, compared with pure TiO2, rGO/TiO2 shows a certain photocatalytic activity under the condition of light irradiation. Among the rGO/TiO2 photocatalysts with different contents of rGO, 1% rGO/TiO2 shows the best photocatalytic performance of ammonia borane hydrolysis, and the value of turnover frequency is 1088.93 μmol·min–1·g–1. Furthermore, the catalyst 1% rGO/TiO2 shows perfect reusability, and its catalytic activity did not decrease significantly even after five reaction cycles.
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高影响因子
BIOELECTROCHEMISTRY
·
2019
·
IF 4.474
Lingpu Jia,Yaxin Zhou,Kaipeng Wu,Qingling Feng,Chunming Wang,Ping He
A flexible acetylcholinesterase (AChE) film biosensor, based on a AuNPs-MoS 2 -reduced graphene oxide/polyimide flexible film (rGO/PI) electrode, has been synthesized for paraoxon detection. In this study, the rGO/PI film acts as the flexible substrate and AuNPs are reduced by monolayer MoS 2 under illumination. Transmission electron microscopy revealed that AuNPs are uniformly dispersed on the MoS 2 -rGO/PI electrode surface with a diameter ~10 nm. X-ray photoelectron spectroscopy indicated that a strong binding force exists between reduced AuNPs and monolayer MoS 2 . The AChE modified AuNPs-MoS 2 -rGO/PI flexible film biosensor is used to hydrolyze acetylcholine chloride and obtain a large current response at 0.49 V by differential pulse voltammetry , demonstrating successful immobilization of AChE. In view of the inhibition of paraoxon on the AChE, under optimal conditions, the AChE/AuNPs-MoS 2 -rGO/PI film biosensor shows a linear response over a concentration range 0.005–0.150 μg/mL, a sensitivity of 4.44 uA/μg/ mL, a detection limit of 0.0014 μg/mL, acceptable reproducibility and stability to paraoxon. The flexible film biosensor has also proved used for detection of paraoxon in real samples.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Xu Zhang,Lianfeng Duan,Xueyu Zhang,Xuesong Li,Wei Lü
Cu 2 S has attracted great attention as anode material of lithium ion battery due to high theoretical capacity and good electron conductivity. However, the poor cyclic stability due to volume change during charging and discharging restrains its further application. Herein, to improve stability of Cu 2 S, 3D matrix composed of reduced graphene oxide (rGO) scaffold and Cu 2 S nanoflowers are synthesized by hydrothermal method and freeze-drying process. The 3D matrix structure could relieve the structural and morphological variation of nanoparticles during charge and discharge processes, and rGO as bridge increases the effective area that is simultaneously accessible to electrons and lithium ions to improve the specific capacity of Cu 2 S nanoflowers. Thus, excellent capacity, stable cycle life and preferable rate capability could be simultaneously realized. The 3D Cu 2 S@rGO composite electrodes show the specific capacity of 1630 mAh g −1 for the first cycle and a reversible capacity of 600 mAh g −1 after 200 cycles at 100 mAh g −1 .
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高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2019
·
IF 4.865
Xiao Zhou,Shaoqi Zhou,Fuzhen Ma,Yanbin Xu
Graphene oxide was prepared using the modified Hummers method and reduced graphene oxide (rGO) - titanium dioxide (TiO 2 ) nanocomposite was synthesised using the one-step hydrothermal treatment . The synergistic effects on adsorption and photocatalytic properties of the rGO-TiO 2 nanocomposite for the humic acid removal were systematically investigated. The results of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Raman and infrared (IR) spectroscopy indicate that GO was partially reduced to reduced graphene oxide (rGO) in the hydrothermal synthesis process and anatase TiO 2 nanoparticles uniformly grew on the surface of rGO. The photoelectron and photohole generated under visible light irradiation were effectively separated on the surface of rGO-TiO 2 . The rGO-TiO 2 nanocomposite exhibited higher photocatalytic activity as a result of the synergistic effects of surface functional groups for adsorption and the excellent conductivity for photocatalytic reaction. The effect of rGO-TiO 2 nanocomposite dosage, light intensity and system temperature on the removal of humic acid solution was investigated. The results show that the removal efficiency of humic acid increased with system temperature and light intensity. When the dosage of rGO-TiO 2 nanocomposite was 1.2 g/L, the temperature, the light intensity and the pH of this system was 303 K, 4.37 Wm −2 and 7, respectively, the removal efficiency of humic acid reached 88.7% under visible light irradiation.
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 8
·4180-4189
·
IF 3.049
Yuzhou Li,Yufan Zhang,Haoran Zhang,Tie-ling Xing,Guo-qiang Chen
In recent years, the energy supply problem of wearable electronic equipment has become a topic of increasing concern. It is necessary to develop energy storage equipment with environmental protection, flexibility, a light quality and excellent performance. In this work, a solid, flexible and symmetrical supercapacitor based on graphene coated cotton fabric was fabricated. The flexible electrode materials were prepared through an environmentally friendly “dry-coating” method and subsequent “two step reduction” method of chemical and microwave reduction, the method is simple and convenient. The morphology and structure of prepared flexible electrode materials were characterized by scanning electron microscopy, X-ray diffraction, and Raman spectrometry. The supercapacitor was assembled in a sandwich structure and packaged and its electrochemical performance was investigated. The flexible sandwich structure (FSS) supercapacitor exhibits high capacitance (464 F g−1 at 0.25 A g−1), good cycling stability (91.6% capacitance retention after 1000 charge and discharge cycles) and excellent electrochemical stability. This supercapacitor with easy fabrication, flexible and excellent electrochemical performance has potential to be used as a wearable device.
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RSC Advances
·
2019
·Vol. 9
·期 26
·15033-15041
·
IF 3.049
Ya Gao,Yongjie Zheng,Jixing Chai,Jingzhi Tian,Tao Jing,Deqing Zhang,Junye Cheng,Huiqing Peng,Bin Liu,Guangping Zheng
Effective separation and rapid transfer of photogenerated electron–hole pairs are key features of photocatalytic materials with high catalytic activity, which could be achieved in co-catalysts. It is reported that the two-dimensional (2D) MoS2 is a promising co-catalyst due to its unique semi-conductive properties and graphene-like layered structure. However, the application of MoS2 as a co-catalyst is limited by its poor electrical conductivity. On the other hand, it is worth noting that TiO2 possesses reactive crystal facets, which is one of the dominant mechanisms for the separation of photogenerated electron–hole pairs. In this work, we prepared MoS2/RGO hybrids as co-catalysts which were doped to TiO2 with highly reactive {001} planes via the hydrothermal method. It was found that the {001}-TiO2/MoS2/RGO photocatalysts with 7 wt% MoS2/RGO co-catalyst show the highest photodegradation activity for the degradation of Rh B under visible light irradiation (λ > 400 nm), which could result from the synergy of the effective separation of electron–hole pairs by the {001} facets in TiO2 and the rapid transfer of electron–hole pairs in MoS2/RGO. The results show that the {001}-TiO2/MoS2/RGO hybrid is a low-cost and stable photocatalyst for the effective degradation of Rh B under visible light.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2019
·Vol. 140
·期 4
·1759-1767
·
IF 2.471
Zhang Jiankan,Zhao Fengqi,Yang Yanjing,Yan Qilong,Zhang Ming,Ma Wenzhe
Fe 3 O 4 /reduced graphene oxide (Fe 3 O 4 /rGO) nanocomposite has been successfully fabricated using a modified interface solvothermal method and characterized by X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. In the preparation procedure, graphene oxide was reduced and ultrafine Fe 3 O 4 nanoparticles (NPs) were uniformly loaded on reduced graphene oxide (rGO) carrier. Scanning electron microscope, transmission electron microscope images and Brunauer–Emmett–Teller specific surface area revealed that the aggregation of Fe 3 O 4 NPs was greatly reduced by introducing rGO as a substrate. The average size of the Fe 3 O 4 NPs anchored on the graphene sheets was 100 nm, which is much smaller than 1-μm bare Fe 3 O 4 . The DSC results showed that Fe 3 O 4 /rGO nanocomposite reduces the first decomposition temperature of dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate (TKX-50) by 44.9 °C and decreases the apparent activation energy of TKX-50 by 26.2 kJ mol −1 , which exhibits higher catalytic performance than its individual components and their physical mixture (hybrid). Hence, Fe 3 O 4 /rGO nanocomposite can be a promising additive for insensitive solid propellants based on TKX-50.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 52
·13830-13838
·
IF 5.16
Xiangming Li,Yihe Zhang,Zequn Ma,Meng Fu,Qi An
Graphical The heat is on : A facile and efficient approach for the preparation of pH responsive self-assembled (electrostatic interactions) rGO-polymer-DOX nanocomposites for photothermal and chemical therapy is reported (see figure). The development of well-controlled drug carriers that are stable and highly effective for the delivery of anticancer agents is challenging. Herein, we report a novel pH-controlled drug delivery system, utilizing reducing graphene oxide (rGO)-polymer self-assembly films as carriers, for the preparation of effective drug nanorods and nanoparticles. In this system, the rGO-polymer carriers were constructed by the alternating assembly of poly- l -lysine (PLL) and polyaspartic acid (PASP) around the rGO sheets. Furthermore, the rGO-polymer cores, which possess a positively charged surface as the desired template, could assemble with negatively charged doxorubicin (DOX) via electrostatic interactions. The DOX embedding efficiency and the morphology of the drug nanocomposites could be controlled by the number of rGO-polymer bilayers and concentration of the rGO-polymer bilayers and the initial DOX concentration. Importantly, the release of DOX could be regulated by controlling the pH and by using a NIR laser. Under acidic conditions, the interactions between the PASP layer and DOX molecules can be broken, resulting in gradual release of the DOX molecules. Upon NIR irradiation, the release of DOX could be further accelerated and a photothermal effect from rGO induced. Cellular uptake and cytotoxicity experiments indicate that the drug nanocomposites possess effective anticancer activity. Thus, in this work, we present a useful strategy for the fabrication of pH-responsive drug nanocomposites for combined photothermal and chemical therapy. The nanocomposite can be used as a potential drug delivery system for practical cancer treatment.
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