JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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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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RSC Advances
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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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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2020
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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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CHEMICAL ENGINEERING JOURNAL
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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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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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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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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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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 7
·2359-2366
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IF 4.052
Sisi Dai,Bin Quan,Baoshan Zhang,Xiaohui Liang,Guangbin Ji
Incorporation of traditional perovskites into reduced graphene oxide (RGO) is an effective strategy to develop useful microwave absorbents. Taking advantage of the suitable impedance of La0.7Sr0.3MnO3 (LSMO), a novel and available microwave absorber was obtained. Here, we showed an outstanding and stable RGO material decorated with LSMO that can be used as an active component of microwave absorption devices. The as-prepared LSMO/RGO composites adopted the merits of RGO and LSMO and provided good properties, such as a controllable dissipation ability, optimized impedance matching, and broadened effective frequency bandwidth. For example, the minimum reflection loss (RL) value of LSMO/RGO composites with a 60% loading filler ratio reached −38.81 dB with a matching thickness of only 1.7 mm. Furthermore, the effective frequency bandwidth can be as wide as 5.64 GHz, with a thickness of 1.95 mm. Therefore, this work initiates a brand new avenue for artificial research of new materials for electromagnetic wave absorption.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Wenxiu He,Hengrui Qiu,Jing Meng,Bin Liu,Jinlong Cui,Yongqiang Zhang
A nanoscale petal-like α-Ni(OH) 2 /reduced graphene oxide (α-Ni(OH) 2 /RGO) composite was synthesized with the one-step microwave method. α-Ni(OH) 2 particles with sizes of approximately 200 nm are uniformly distributed on the reduced graphene oxide sheet in the sample. When used as an electrode for alkaline rechargeable batteries, the discharge capacity of the α-Ni(OH) 2 /RGO composite reaches 333.5 mAh/g at 0.2C and 247.1 mAh/g at 10 C, respectively, with an excellent rate capability. After 2000 cycles, the capacity of the electrode is insignificantly attenuated, indicating a high capacity retention and cycling stability. The outstanding electrochemical properties are attributed to the nanoscale petal-like structure α-Ni(OH) 2 anchoring on the RGO sheets, which facilitates ion diffusion and increases the active surface, which is effectively reacting with the electrolyte. The nanoscale petal-like electrode material fabricated in this study provides clues to address the problem of energy applications of high-performance alkaline rechargeable batteries.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 19
·12214-12224
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IF 10.733
Yuanzhou Yao,Xiaohui Zhao,Amir Abdul Razzaq,Yuting Gu,Xietao Yuan,Rahim Shah,Yuebin Lian,Jinxuan Lei,Qiaoqiao Mu,Yong Ma,Yang Peng,Zhao Deng,Zhongfan Liu
The passivation of lithium metal anodes to mitigate an unstable solid electrolyte interface and parasitic dendrite growth is the key premise for their successful implementation in lithium metal batteries. Herein, aiming to simultaneously reduce the interfacial resistance and to suppress lithium dendrites, we coated lithium metal anodes with two-dimensional (2D) rGO layers prepared via a solvent-evaporation-assisted self-assembly. Upon lithiation/delithiation, the rGO coating cracked into mosaic-like flakes, in between which the interconnected gaps served as the passage for uniform lithium plating/stripping. Half cells composed of a sandwich Cu/Li/rGO electrode vs. Cu foils revealed much improved Li usage and coulombic efficiencies. Through ex situ SEM imaging and XPS depth profiling, a comprehensive view of Li intercalation, deposition, and dendrite suppression on the rGO coating was obtained. As a result of the improved kinetics of Li transportation, excellent electrochemical performances were demonstrated in symmetric gLi‖gLi cells with a stabilized overpotential of only 87.9 mV at 5 mA cm−2 over 600 cycles, and in Li–S batteries with a stabilized capacity of 1200 mA h g−1 at 1C near 1000 cycles.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xiangyang Xu,Jingyu Qin,Ying Wei,Shaochen Ye,Jing Shen,Yan Yao,Bo Ding,Yirui Shu,Guangyu He,Haiqun Chen
A simple route was reported for the synthesis of reduced graphene oxide (RGO) based NiFe 2−x Co x O 4 nanocomposite (NiFe 2−x Co x O 4 -RGO), a catalyst to activate persulfate (PS) for the degradation of bisphenol A (BPA). The crystalline structure and morphology of the composite were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). It is confirmed that spherical NiFe 2−x Co x O 4 nanoparticles with a size around 14 nm are uniformly anchored on RGO sheets. Compared with recently reported catalysts, NiFe 0.7 Co 1.3 O 4 -RGO 1 exhibits impressively higher catalytic activity, leading to much faster degradation of BPA with pretty less PS used. Moreover, the excellent catalytic performance can be maintained in a wide range of pH. The radical scavenging study and EPR experiments indicate that free radical, surface-bound radical and nonradical processes are involved in the degradation of BPA. In addition, the degradation of various organic contaminants other than BPA were also carried out, indicating that NiFe 0.7 Co 1.3 O 4 -RGO 1 /PS system has higher catalytic activity toward BPA.
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SENSORS
·
2019
·Vol. 19
·期 6
·1281
·
IF 3.031
Qihua Sun,Zhaofeng Wu,Haiming Duan,Dianzeng Jia
Triacetone triperoxide (TATP) is a self-made explosive synthesized from the commonly used chemical acetone (C3H6O) and hydrogen peroxide (H2O2). As C3H6O and H2O2are the precursors of TATP, their detection is very important due to the high risk of the presence of TATP. In order to detect the precursors of TATP effectively, hierarchical molybdenum disulfide/reduced graphene oxide (MoS2/RGO) composites were synthesized by a hydrothermal method, using two-dimensional reduced graphene oxide (RGO) as template. The effects of the ratio of RGO to raw materials for the synthesis of MoS2on the morphology, structure, and gas sensing properties of the MoS2/RGO composites were studied. It was found that after optimization, the response to 50 ppm of H2O2vapor was increased from 29.0% to 373.1%, achieving an increase of about 12 times. Meanwhile, all three sensors based on MoS2/RGO composites exhibited excellent anti-interference performance to ozone with strong oxidation. Furthermore, three sensors based on MoS2/RGO composites were fabricated into a simple sensor array, realizing discriminative detection of three target analytes in 14.5 s at room temperature. This work shows that the synergistic effect between two-dimensional RGO and MoS2provides new possibilities for the development of high performance sensors.Keywords:(TATP) precursors;MoS2/RGO composites;sensor arrays;synergistic effect
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CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Muhammad Tuoqeer Anwar,Xiaohui Yan,Muhammad Rehman Asghar,Naveed Husnain,Shuiyun Shen,Liuxuan Luo,Xiaojing Cheng,Guanghua Wei,Junliang Zhang
Carbon black is utilized as a conventional electrocatalyst support material for proton exchange membrane fuel cells. However, this support is prone to corrosion under oxidative and harsh environments, thus limiting the durability of the fuel cells. Meanwhile, carbon corrosion would also weaken the linkage between Pt and the support material, which causes Pt agglomeration, and consequently, deterioration of the cell performance. To overcome the drawbacks of a Pt/C electrocatalyst, a hybrid support material comprising molybdenum disulfide and reduced graphene oxide is proposed and synthesized in this study to exploit the graphitic nature of graphene and the availability of the exposed edges of MoS 2 . TEM results show the uniform dispersion of Pt nanoparticles over the MoS 2 -rGO surface. Electrochemical measurements indicate higher ECSA retention and better ORR activity after 10000 potential cycles for Pt/MoS 2 -rGO as compared to Pt/C, demonstrating the improved durability for this hybrid support material.
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