RSC Advances
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2021
·Vol. 11
·期 26
·15817-15824
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IF 3.361
Tianyi Gao,Chong Sun,Nana Zhang,Yang Huang,Hongxing Zhu,Chunmei Wang,Jinxuan Cao,Daoying Wang
Kanamycin (KANA) residue in meat is particularly harmful to public health and there is an urgent need to establish a fast, accurate and low-cost method to determinate KANA in food quality control. In this paper, hemin–reduced graphene oxide-carboxylated multiwalled carbon nanotubes (hemin–rGO–cMWCNTs) were designed and prepared, and the characteristics of hemin–rGO–cMWCNTs are presented. After that, an aptamer/hemin–rGO–cMWCNTs sensor for determination of KANA was developed. The electrochemical characteristics were studied by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). Under optimal conditions, the sensitive response of the aptasensor towards KANA presented a wide concentration range of 10−9 to 10−6 M and a low detection limit of 0.36 nM (S/N = 3). Meanwhile, the aptasensor showed prominent selectivity, high stability and acceptable reproducibility in the application of KANA detection. In addition, the aptasensor detection in real samples correlated well with that obtained by liquid chromatograph mass spectrometer (LCMS).
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Yang Han,Zhoujia Liu,Fenfen Zheng,Yixuan Bai,Zhiqian Zhang,Xiaogang Li,Weiwei Xiong,Junhao Zhang,Aihua Yuan
In this study, a novel flower-like Co-TCPP MOF/rGO composite has been successfully synthesized by combining cobalt meso-tetrakis(4-carboxyphenyl) porphyrin (Co-TCPP MOF) and reduced graphene oxide (rGO) via a simple one-pot solvothermal method. The introduction of rGO not only reduces the stacking of MOF effectively, but also facilitates the formation of a continuous conductive network composed of entangled graphene and Co-TCPP MOF in favor of rapid electron transport. More importantly, the ultrathin lamellar structure of Co-TCPP MOF/rGO composite nanosheets could expose more active sites, reduce the diffusion distance of Li + to the internal electroactive sites, and improve the overall electrical conductivity of the electrode due to their sufficient contact with carbon. When evaluated as anode materials for lithium-ion batteries, the flower-like Co-TCPP MOF/(15 wt%)rGO composite electrode delivers a specific capacity of 1050 mAh g −1 at 100 mA g −1 after 100 cycles. A specific capacity of 650 mAh g −1 can be remained after 300 cycles even at 1000 mA g −1 . The superior performance of the Co-TCPP MOF/(15 wt%)rGO composite electrode could be attributed to the introduction of rGO, which prevents the stacking growth of Co-TCPP MOF crystals along the horizontal direction and improves the electrical conductivity.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xin Li,Jingru Guan,Haopeng Jiang,Xianghai Song,Pengwei Huo,Huiqin Wang
Construction of multi-interface contact step-scheme (S-scheme) photocatalyst is a promising pathway to achieve high-electron transfer efficiency for photocatalytic CO 2 reduction. In this paper, g-C 3 N 4 nanosheets were selected as the main photocatalyst, rod-like CeO 2 (R-CeO 2 ) with unique Ce 4+ →Ce 3+ conversion property and rGO were loaded on the g-C 3 N 4 surface to construct 2D-1D-2D sandwich photocatalyst. The yields of CO and CH 4 were about 63.18 and 32.67 μmol/g after 4 h when the rGO/R-CeO 2 /g-C 3 N 4 was used as catalyst, which were about 4 and 6 times higher than that of pure CN, respectively. Cyclic experiments proved that the composite had excellent photocatalytic and material stability. Photoelectrochemical tests showed that the construction of S-scheme electron transfer model and the introduction of rGO can great enhance the electron transmission and separation of photogenerated electron-hole pairs. CO 2 adsorption test identified that the loading of R-CeO 2 and rGO obviously enhanced the CO 2 adsorption ability of pure g-C 3 N 4 . Density functional theory (DFT) calculations used to analyze the electron transfer path and the formation of the build-in electric field at the semiconductor interface. In-situ FTIR and 13 CO 2 element-tracer detection carried out to research the process of CO 2 photoreduction. A possible multi-interface contact S-scheme electron transfer mechanism for enhanced CO 2 photoreduction activity has been discussed.
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Analytical Methods
·
2020
·Vol. 12
·期 41
·4956-4966
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IF 2.596
Wenzhan Li,Min Chen,Jintao Liang,Chunting Lu,Min Zhang,Fangrong Hu,Zhide Zhou,Guiyin Li
Herein, a label-free electrochemical aptasensor for alpha-fetoprotein (AFP) analysis was established. The AFP aptamer (AFP-Apt), as the recognition molecule, was immobilized on the surface of a screen-printed carbon electrode, which was modified by gold–platinum metallic nanoparticles and reduced graphene oxide–chitosan–ferrocene nanohybrids (Au–Pt NPs/RGO–CS–Fc), to build the AFP electrochemical aptasensor. The construction process of the aptasensor was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and electrochemical impedance spectroscopy. With the addition of AFP, the formation of the AFP-aptamer conjugation blocked the electron transfer reaction, reducing the differential pulse voltammetric responses of the current of Fc in the RGO–CS–Fc nanohybrids. By optimizing the experimental parameters, AFP could be detected with the dynamic concentration range of 0.001 to 10.0 μg mL−1 and with a detection limit of 0.3013 ng mL−1. In addition, the approach was manifested to have good selectivity, reproducibility, and stability. The fabricated aptasensor had a good recovery rate of 102.36% to 118.09% in real human serum samples. This work demonstrates that the electrochemical aptasensor is a useful tool for analyzing AFP inexpensively, rapidly, and accurately.
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Journal of the Taiwan Institute of Chemical Engineers
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2021
·
IF 5.876
Ming Cao,Yingbo Chen,Xiujing Huang,Lei Sun,Jiaopeng Xu,Kang Yang,Xinyu Zhao,Ligang Lin
ABSTRACT The construction of highly efficient membranes toward oil/water separation is crucial in severe oily sewage treatment while graphene materials are considered stable blocks for oil/water separating membranes. Herein, first, with the presence of graphene oxide, in-situ polymerization of caprolactam was carried out and polyamide-6-reduced graphene oxide composites (PA6-rGO) were successfully synthesized. Then the PA6-rGO nanofiber membranes were prepared by electrospinning combining electrospraying process. Nanofiber skin with microshphere/bead fiber structure on the surface of ordinary electrospun fiber membrane was prepared in 2 steps. Hence the nanofiber membrane separation performance to emulsions under gravity driving was investigated. The results showed that the flux of surfactant-stabilized emulsions would reach up to 765.4 Lm −2 ·h −1 with the rejection up to 99.6%. It is expected to be practically applied in a low-pressure driven membrane separation system to achieve preliminary separation of severe oily sewage.
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CRYSTENGCOMM
·
2020
·Vol. 23
·期 6
·1472-1481
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IF 3.117
Chun-Xiao Li,Ru-Ting Huang,Xian-Yang Shi
Cu7S4/reduced graphene oxide (rGO) photocatalysts are attracting increasing interest because of their low cost and environmental friendliness. In this study, Cu7S4/rGO nanocomposites with high visible-light photocatalytic activity were successfully synthesized via biological and chemical methods. The prepared Cu7S4/rGO nanocomposites exhibited exceptional photocatalytic activity for methyl green (MG) reduction. In particular, the nanocomposites photocatalyst with A-N (biosynthesis with Na2S as the sulfur source) provided the best photocatalytic performance, and could degrade 98.3% MG within 100 min. Their photocatalytic activity sequence is in the following order: A-N (98.3%) > A-U (biosynthesis with CuSO4 as the copper source) (97.8%) > A-C (biosynthesis with CH4N2S as the sulfur source) (97.7%) > A-180 (96.7%) (chemical synthesis at 180 °C in a steel autoclave) > Cu7S4 (69.8%). After five repeated tests, the photocatalyst used in this study showed excellent stability. The photocatalytic activity enhancement can be attributed to Cu7S4 combined with rGO, which can enhance the active center and increase electron transfer. This study provides a novel method for the preparation of a photocatalyst that can quickly and effectively solve dye pollution, and reduce other pollutants. Additionally, the photocatalyst is expected to be used in the fields of photocatalysis, water decomposition and solar cells.
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RSC Advances
·
2020
·Vol. 10
·期 26
·15091-15097
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IF 3.119
Lei Ge,Meng Zhang,Ran Wang,Na Li,Lexin Zhang,Shufeng Liu,Tifeng Jiao
In this study, natural polymer material chitosan (CS) and graphene oxide (GO) with large specific surface area were used to prepare a new CS/RGO-based composite hydrogel by using glutaraldehyde (GA) as cross-linking agent. In addition, a CS/GA/RGO/Pd composite hydrogel was prepared by loading palladium nanoparticles (Pd NPs). The morphologies and microstructures of the prepared hydrogels were characterized by SEM, TEM, XRD, TG, and BET. The catalytic performance of the CS/GA/RGO/Pd composite hydrogel was analyzed, and the experimental results showed that the CS/GA/RGO/Pd composite hydrogel had good catalytic performance for degradation of p-nitrophenol (4-NP) and o-nitroaniline (2-NA). Therefore, this study has potential application prospect in wastewater treatment and provides new information for composite hydrogel design.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 10
·10715-10728
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IF 3.056
Chen Jingda,Liang Qianwei,Ploychompoo Sittipranee,Luo Hanjin
A novel functional rGO aerogel was synthesized by a facile hydrothermal method. In this process, graphene oxide (GO) was used as the precursor and oxidant to synthesize the aerogels. Ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) and pyrrole monomer (reducing agent) were selected to use as hole scavenger and nitrogen sources. The obtained EDTA-2Na/polypyrrole (Ppy)/rGO aerogel (EPGA) has a high adsorption capacity for Cr(VI) anions, and the maximum adsorption capacity reached 361 mg/g at 298 K at pH of 2. In addition, EPGA exhibited a good ability to selectively remove Cr(VI) anions under the effect of coexisting ions (Cl − , NO 3 − , SO 4 2− , PO 4 3− , Ni + , Cu 2+ , Zn 2+ , and Cd 2+ ) and good regeneration ability. The kinetics process and adsorption isotherm can be fitted well with the pseudo-second-order kinetic model and Freundlich isotherm model, respectively. The removal mechanism involved electrostatic interaction, reduction, ion exchange, and chelation process. This work provides a simple and environmentally friendly synthetic route for EPGA, which will be a potential candidate for efficient removal Cr(VI) anions from industrial wastewater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Bin Zhang,Xiaohan Ma,Jun Ma,Yuanming Zhou,Guocheng Liu,Dong Ma,Zhihan Deng,Mingming Luo,Yanjun Xin
To enhance the photocatalytic performance of titanium dioxide (TiO 2 ) and reduce the photocorrosion of graphitic carbon nitride (g-C 3 N 4 ), two-dimensional (2D) reduced graphene oxide (rGO) and g-C 3 N 4 co-modified three-dimensional (3D) TiO 2 nanotube arrays (rGO@g-C 3 N 4 /TNAs) photoelectrodes were fabricated by the combination of impregnation, annealing and electrochemical cathode deposition. The micromorphology and microstructure were observed by SEM and TEM. The crystalline structure and element composition were characterized by XRD, XPS and Raman spectra. The optical and photo-electrochemical properties were analyzed by UV–vis DRS, open circuit potential and photocurrent density. Results indicated that g-C 3 N 4 and rGO were successfully loaded on the surface of the TNAs photoelectrodes and formed rGO@g-C 3 N 4 /TNAs heterostructure. The photocatalytic activity of the photoelectrodes was evaluated by the degradation rate of tetracycline hydrochloride (TC) under xenon lamp irradiation. The introduction of g-C 3 N 4 and rGO reduced the band gap of TNAs photoelectrodes and promoted the separation of photo-induced electron-hole pairs. The rGO@g-C 3 N 4 /TNAs photoelectrodes exhibited higher photo-electrochemical properties and photocatalytic activity. The removal rate of TC by rGO@g-C 3 N 4 /TNAs photoelectrodes could reach 90% under 120 min photo-degradation and reaction kinetic constant was 2.38 times that of TNAs photoelectrodes. The active radicals capture and ESR experiments results showed that O 2 − radical and OH radical played the major role in photocatalytic degradation of TC. The possible photocatalytic mechanism of rGO@g-C 3 N 4 /TNAs photoelectrodes was presented.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xiangming Fang,Guanhong Lu,Asad Mahmood,Yan Wang,Xiao Wang,Xiaofeng Xie,Zhihong Tang,Jing Sun
The photocatalytic application of TiO 2 is limited due to low light harvesting abilities in the whole solar spectrum and fast recombination of the photoinduced electron-hole pairs. Herein, we report a TiO 2 -based ternary composite photocatalyst (MT@rGO-x; x = 0.05–0.2) with a pearlescent color effect, which incorporates a mica reflection core and a rGO multifunctional shell as cocatalysts. The micro flake composites were synthesized by a facile precipitation route and applied first to photodegrade gaseous acetaldehyde. MT@rGO-0.1 composite has optimal performance, which is 2.5 times photodegradation efficiency and 3 times CO 2 mineralization efficiency higher than those of pure TiO 2 . The enhanced photocatalytic performance of MT@rGO composite is associated with effectively improved light harvesting of TiO 2 by mica reflection. The presence of rGO facilitates the separation of electron-hole pairs and pollutant absorption. In addition, the superoxide radical was proved as the decisive active species for the photodegradation of acetaldehyde by electron spin resonance analyses and radical quenching tests. Our MT@rGO photocatalyst is expected to be applied as a functional and decorative additive of car paint, which is subject to photodegradation due to air pollutants.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2020
·
IF 3.306
Shuguang Li,Zhiyu Liu,Chunxiao Lu,Zhihui Qu,Congcong Piao,Jianhe Tang,Dawei Fang,Jun Wang
The use of co-catalysts can observably enhance photocatalytic hydrogen production activity. In this work, a novel visible-light driven photocatalyst, (MoSe 2 -RGO)/(Er 3+ :Y 3 Al 5 O 12 /ZnS)/RuO 2 nanocomposite, is prepared for the first time by loading Er 3+ :Y 3 Al 5 O 12 , MoSe 2 -RGO and RuO 2 on the surface of ZnS nanoparticles. Er 3+ :Y 3 Al 5 O 12 as an effective visible-to-ultraviolet up-conversion luminescence agent can provide the ultraviolet-light to activate wide band-gap ZnS. MoSe 2 -RGO and RuO 2 , acting as conduction band co-catalyst and valence band co-catalyst, respectively, can effectively separate the photo-generated carriers and supply more reactive sites. The activities of the photocatalysts were assessed via photocatalytic hydrogen production in Na 2 S and Na 2 SO 3 aqueous solution under 300 W xenon lamp irradiation. In addition, the visible-light irradiation time and used times of the prepared samples as influence factors on the photocatalytic hydrogen production were also investigated. It was easily found that the prepared (MoSe 2 -RGO)/(Er 3+ :Y 3 Al 5 O 12 /ZnS)/RuO 2 nanocomposite shows fairly high activity in photocatalytic hydrogen production, compared with single ZnS photocatalyst. It was mainly attributed to the excellent up-conversion luminescence property of Er 3+ :Y 3 Al 5 O 12 and the efficient separation of photo-generated electrons and holes caused by MoSe 2 -RGO and RuO 2 . This research may pave an effective way for photocatalytic hydrogen production utilizing solar light.
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MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Jun Liu,Lingling Sun,Guangli Li,Jue Hu,Quanguo He
In this study, spindle-like α-Fe 2 O 3 mesocrystals/reduced-graphene-oxide composites modified glassy carbon electrode (α-Fe 2 O 3 /rGO/GCE) is developed for ultrasensitive electrochemical detection of DA. Morphologies and crystal structures of this composite are characterized by SEM, TEM , XRD , Raman spectrum, and XPS , respectively. The electrochemical behavior of DA on these electrodes are investigated by CV and EIS . The electrochemical conditions are optimized systematically. As results, the oxidation current of DA on α-Fe 2 O 3 /rGO/GCE is 38.13-fold increase than that on bare GCE. It is ascribed to the high catalytic activity of α-Fe 2 O 3 mesocrystals and large electrochemical active area of rGO. Under the best voltammetric condition, wide linear detection range (from 1.0×10 −8 to 9.0×10 -4 mol/L) and low LOD of 3.26 nM (S/N=3) are obtained on the α-Fe 2 O 3 /rGO/GCE. Furthermore, this electrode is also used for DA detection in real human serums samples successfully. This α-Fe 2 O 3 /rGO/GCE provides a good example in design of other mesocrystals-based composite materials for electrochemical detection.
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