DESALINATION
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2020
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IF 7.098
Haojie Zeng,Zongxue Yu,Liangyan Shao,Xiuhui Li,Meng Zhu,Yuchuan Liu,Xiaofang Feng,Ximei Zhu
A novel photocatalytic membrane was prepared by using graphene oxide (GO), UiO-66-NH 2 and Ag 2 CO 3 as basic materials on the surface of PVDF membrane by vacuum filtration self-assembly. The prepared Ag 2 CO 3 @UiO-66-NH 2 /GO (AgCO@UiO/GO) membrane was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The AgCO@UiO/GO membrane possessed the photocatalytic effects, which significantly enhanced the separation effect of dyes and Cr(VI) wastewater. In particular, the AgCO@UiO/GO membrane can achieve complete removal of MB , RB ,MR and Cr(VI) under light conditions maintaining the fluxes during filtration process reach about 50 L · m −2 · h −1 . In addition, after long-time experiments, the AgCO@UiO/GO membrane retained a higher removal rate and maintained a high flux under light conditions than without light for all dyes and Cr(VI). The unique structure of AgCO@UiO/GO membrane with a large number of screening structures and photocatalytic activity resulting a better removal rate for pollutants and reducing membrane fouling . Furthermore, the AgCO@UiO/GO membrane shows a great potential in improving membrane removal performance and a solution to balance trade-off effect.
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高影响因子
Materials
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2020
·Vol. 13
·期 12
·2719
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IF 3.057
Yan Jiang,Junfeng Yang,Zhuoming Xie,Qianfeng Fang
The biggest obstacle for the application of tungsten as the target materials in the spallation neutron source is its serious corrosion in the coolant of flowing water. For this reason, W–Cr–C clad tungsten was developed by tungsten carburizing in a spark plasma sintering device, with superior corrosion resistance in the static immersion and electrochemical corrosion test. This work focused on its erosion and corrosion performance in a flowing water system, based upon test parameters simulated under the service conditions. W–Cr–C clad tungsten showed superior corrosion resistance to that of bare tungsten due to the corrosion form changing from the intergranular corrosion of bare tungsten to pitting corrosion of W–Cr–C coating. The corrosion rate of tungsten was as high as tenfold that of the coated sample at 20 °C, and at most fourfold at 60 °C after testing for 360 h. Effects of water velocity and temperature on pitting and intergranular corrosion were investigated in detail and their corresponding corrosion mechanisms were analyzed and discussed.Keywords:tungsten;W–Cr–C coating;carburization;intergranular corrosion;pitting corrosion
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Xinran Li,Danning Zhang,Zhehua Liu,Chuan Lyu,Shu Niu,Zhaojun Dong,Cong Lyu
The system of peroxymonosulfate (PMS) activated by CoFe 2 O 4 has been widely investigated to degrade organic pollutants. However, low catalytic activity for extremely recalcitrant organic pollutants (e.g. benzotriazole (BTA)) and potential leaching of metal ions limit its further application. As such, CoFe 2 O 4 supported on N-doped 3D graphene aerogels (CoFe 2 O 4 /N-3DG) was developed for highly efficient BTA degradation with improved stability and recyclability. It turns out that the degradation rate constant of BTA in CoFe 2 O 4 /N-3DG/PMS (0.0254 ± 0.0012 min −1 ) system was 19.5 times higher than that in CoFe 2 O 4 /PMS (0.0013 ± 0.0024 min −1 ) system. Three N species (pyridine, pyrrole and graphite N) enhanced the redox activity, electron transfer efficiency and active site density of CoFe 2 O 4 /N-3DG, thereby positively enhancing the catalytic performance. Furthermore, it is attributed to the synergistic effect of N-3DG-mediated non-radical pathway and CoFe 2 O 4 -dominated radical pathway. Particularly, multiple reactive oxygen species (ROS, •OH, SO 4 − •, O 2 – • and 1 O 2 ) and direct electron transfer achieve effective degradation of BTA. Ultimately, BTA was broke down to smaller intermediates or mineralized to CO 2 in three main pathways, involving three ring-opening reaction of benzene and triazole. In addition, the leaching of total Co and Fe ions are reduced by 88% and 57% than counterparts from CoFe 2 O 4 after four reaction cycles, respectively, demonstrating improved stability and reusability. Overall, this study will expand the good application of graphene aerogels and provide new insights of enhancing the degradation of extremely recalcitrant organic pollutants by catalyzed PMS system.
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ELECTROCHIMICA ACTA
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2020
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IF 6.215
Fang Tang,Jinyu Gao,Qiaoyun Ruan,Xianwen Wu,Xiangsi Wu,Tao Zhang,Zhixiong Liu,Yanhong Xiang,Zeqiang He,Xianming Wu
ABSTRACT Aqueous zinc ion batteries (AZIBs) show tremendous application prospect in the fields of energy storage for smart grid and electric tools because of their high safety, environmental benignity and low cost. However, the sluggish zinc ion diffusion kinetics and the serious manganese dissolution issue seem to impede its practical application. Herein, the MnO/C@rGO composites are fabricated via an in situ strategy of one-step MOFs-derived solvothermal method , combined with a calcination step at 570 °C under Ar for 2 h. As further evaluated as a cathode for AZIBs, it can maintain a discharge capacity of 170.6 mAh g -1 after 300 cycles at 500 mA g -1 . Importantly, even as the current density reaches up to 2.0 A g -1 , it still delivers a reversible capacity as high as 110.1 mAh g -1 . The excellent cycleability, superior rate capability and smaller self-discharge phenomenon are ascribed to the inhibition of manganese dissolution and the conductivity improvement. Therefore, this work may give a new insight into improving the comprehensive electrochemcial performances of manganese-based cathode materials for AZIBs with large power densities and long cycle life.
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ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Lijun Gao,Qiang Dong,Silin Bai,Sucen Liang,Chao Hu,Jieshan Qiu
Capacitive deionization (CDI) has shown great promise in desalinating salt water; however, conventional CDI electrode materials suffer from low specific salt capacity and charge efficiency owing to the co-ion expulsion effect. Herein, using expanded MoS2 nanosheets supported by reduced graphene oxide (MoS2/rGO) as the intercalation electrode, we develop a hybrid CDI system that shows a battery-like behavior and can reversibly store cations through the intercalation mechanism. The incorporation of rGO in the composite not only affords a conductive support and ensures fast electron transfer but also, more importantly, widens the MoS2 interlayer spacing from 0.62 to 0.73 nm. The expanded MoS2 interlayer facilitates the diffusion of cations and decreases the internal strain during the intercalation/de-intercalation process. Also, it endows MoS2/rGO with more accessible sites and space for cations in the electrolyte. Benefiting from the desirable structure features, the hybrid CDI system delivers a remarkable specific salt capacity of 34.20 mg g–1 and a charge efficiency as high as 97% in 300 mg L–1 sodium chloride aqueous solution. The MoS2/rGO involved in the CDI system for the adsorption of other metal ions is also verified, indicating its potential applications for the removal of various metal ions in brackish water and seawater.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2020
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IF 3.306
Jinying Du,Ning Li,Yu Tian,Jun Zhang,Wei Zuo
A novel composite membrane was prepared successfully by blending polyvinylidene fluoride (PVDF) with the synthesized graphene oxide-zinc sulfide (GO-ZnS) nanocomposites via phase inversion method. The dispersion of GO-ZnS and its effect on the performance of the PVDF membrane were investigated using the morphology, crystal structure and chemical composition of the composite PVDF membrane. With the content of GO-ZnS in the PVDF membrane increasing from 0 to 5.0 wt%, the contact angle declined continuously and thus the hydrophilicity of membrane increased after modification. Similarly, the pure water flux of GO-ZnS/PVDF membrane reached up to 431.9 L/(m 2 h) when 5.0 wt% GO-ZnS was blended. All membranes presented a high bovine serum albumin (BSA) removal and the rejection was about 86.5%. More importantly, the GO-ZnS/PVDF membrane exhibited a smaller irreversible fouling ratio and a higher flux recovery rate, revealing that blending with GO-ZnS could improve the self-cleaning under UV irradiation and the antifouling properties of PVDF membrane.
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APPLIED THERMAL ENGINEERING
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2020
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IF 4.725
Gong Cheng,Xinzhi Wang,Yurong He
Multifunctional phase change composites, which have both high photo-thermal conversion capability and high latent-heat capacity, are in great demand for large number of applications. In this work, a shape-stabilized reduced graphene oxide sponge-based phase change composite that has reduced graphene oxide decorated melamine sponge as a support and paraffin wax as a filler was fabricated. Because of the lipophilicity of the reduced graphene oxide, paraffin wax is well adsorbed on the skeleton of the sponge. The loading percentage of paraffin wax could reach up to ~98%. Compared to pure sponge, the anti-leakage ability of the composite showed great improvements. The melting temperature and latent heat of the composite was 56 °C and 143.0 J/g, respectively. The reduced graphene oxide also gave the prepared phase change composites good solar absorption efficiencies that reached 95%. Under solar light irradiation, the composites could effectively harvest and convert solar energy into thermal energy. The phase change thermal storage efficiency reached up to 88.7%. Based on the heat storage characteristics of the phase change composites, a solar-driven thermoelectricity experiment was conducted, and results showed that the thermal energy was stored in the phase change materials and released over an elongated period, during which the open circuit voltage reached to 1.30 V. Therefore, the multifunctional phase change composites have potential for applications in various sustainable uses, including as solar thermal-energy storage, and waste-heat recovery.
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Advanced Materials Interfaces
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2020
·Vol. 7
·期 15
·2000492
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IF 4.948
Zhenming Chu,Weicheng Jiao,Yifan Huang,Meiling Yan,Yongting Zheng,Rongguo Wang,Xiaodong He
As one of the major passive anti-icing method, superhydrophobic surfaces have attracted extensive attentions to solve the icing problem. Self-sensing properties of multifunctional superhydrophobic materials broaden the application prospects such as anti-icing detection. Here, 1 H ,1 H ,2 H ,2 H -perfluorodecyltrichlorosilane (FDTS) modified graphene based micronano hierarchical structure films are prepared, which exhibit superior superhydrophobic characteristics with the water contact angle (WCA) of 152.1° and sliding angle (SA) of 2.3° under the temperature of −10 °C and condensation. The dynamic impact and bounce process of supercooled droplets on micronano hierarchical structure film indicates excellent anti-icing performance. More importantly, the prepared superhydrophobic film can rapidly sense the impacting droplets of different falling heights and sizes, and record the entire process of water droplets freezing. This research is of great significance for the research of real-time anti-icing and low-temperature self-sensing.
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Analytical Methods
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2020
·Vol. 12
·期 31
·3892-3900
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IF 2.596
Qinghua Yu,Ying Zhao,Lihui Huang,Jiawei Sun,Dangqin Jin,Yun Shu,Qin Xu,Xiao-Ya Hu
Flexible sensors are of considerable interest for the development of wearable smart miniature devices. This work reported a flexible electrochemical platform based on reduced graphene oxide (rGO) for the detection of salicylic acid (SA). The free-standing and flexible rGO electrode was prepared via a simple extruded process. Dynamic mechanical deformation and bending studies illustrated the resilience and compliance of the flexible electrode against extreme mechanical deformations. Quantitative analysis of SA was performed by using differential pulse voltammetry (DPV) with this flexible rGO electrode. Linearity ranges for SA were obtained from 1.0 × 10−10 M to 1.0 × 10−5 M with the detection limit of 2.3 × 10−11 M (S/N = 3). This strategy provided a new insight into the design and application of flexible electrodes. It will extend the applications of rGO in sensing, bio-electronics and lab-on-chip devices.
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高影响因子
Frontiers in Chemistry
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2020
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IF 3.693
Liu Yali,Zhou Mingyue,Jin Chen,Zeng Jinxiang,Huang Chao,Song Qiuye,Song Yonggui
In this work, a covalent-organic framework with high carbon and nitrogen content microstructures (named COF-LZU1), assisted by 3D nitrogen-containing kenaf stem composites (represented as COF-LZU1/3D-KSCs), was constructed. Moreover, it was utilized for immobilizing acetylcholinesterase (AChE) for identifying trichlorfon, a commonly applied organophosphorus (OP) pesticide. The development of COF-LZU1/3D-KSC was affirmed by SEM, PXRD, and EDXS. The findings confirmed that COF-LZU1 microstructures were uniformly developed on 3D-KSC holes using a one-step synthesis approach, which can substantially enhance the effective surface area. Also, the COF-LZU1/3D-KSC composite contains not only the nitrogen element in COF-LZU1 but also the nitrogen element in 3D-KSC, which will greatly improve the biocompatibility of the material. The AChE/COF-LZU1/3D-KSC integrated electrode was fabricated by directly fixing a large amount of AChE on the composite. At the same time, the integrated electrode had good detection efficiency for trichlorfon. Improved stabilization, a wide-linear-range (0.2–19 ng/mL), and a lower detection limit (0.067 ng/mL) have been displayed by the sensor. Therefore, this sensor can be used as an important platform for the on-site detection of OP residue.
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APPLIED CLAY SCIENCE
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2020
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IF 4.605
Pan Liu,Guixia Fan,Jingtao Wang,Guoli Zhou,Yijun Cao,Xiangke Han,Xueqin Xu
Biomimetic mineralization is one of the effective methods for synthesizing functional materials with specific shape structures, and the raw materials required for the process are cheap and readily available. Here we designed a novel method, in which graphene oxide assisted biomimetic mineralization to prepare a biomimetic-coral structural material with the characteristics of sensing and capturing metal ions . The coral-like structure featured tight, fine and uniform channels for efficient provided plentiful adsorption sites while exposing various functional groups such as -OH, -COOH. The maximum theoretical adsorption capacity of the material was calculated by the Langmuir model. About 88.3% of Cu(II) was adsorbed rapidly within a contact time of 30 min, and the maximum adsorption capacity was 198.8 mg g −1 at pH = 6 and T = 298 K. The adsorption mechanism was proved that chelation was the dominant governing mechanism for copper ions adsorption on the material.
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MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Lihua Zhang,Lihua He,Qi Wang,Qianlin Tang,Fei Liu
A new molecularly imprinted polymer (MIP) electrochemical sensor was prepared applying one-step electro-copolymerization of 3, 4-ethylenedioxythiophene (EDOT) and methacrylic acid (MAA) in the presence of sulfadimidine as a template molecule on a glassy carbon electrode (GCE) which modified with graphene quantum dots (GQDs)-Pt nanoparticles (PtNPs). A computational approach was employed to screen the suitable functional monomer, and the simulation data suggested that EDOT and MAA as bifunctional monomers exhibited a preferable capability to recognize the target molecule compared to other monomers. The MIP material was characterized with scanning electron microscope (SEM), transmission electron microscope (TEM) and electrochemical impedance spectroscopy (EIS). The performance of MIP sensor was evaluated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results indicated that the electro-copolymerization of EDOT and MAA provides large amounts of functional groups for the binding of the template molecules, which significantly enhances the sensitivity of the MIP sensor. The calibration curve demonstrated linearity over a concentration range of 0.1 nM-0.1 mM with a detection limit of 0.023 nM. This study provides complete and valuable information on the rational design, preparation, and application of sulfadimidine molecularly imprinted polymers using advanced materials and new bi-functional monomers.
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