COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2021
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IF 7.664
Ziyang Zhou,Xiaohong Ji,Sepideh Pourhashem,Jizhou Duan,Baorong Hou
Two dimensional nanomaterials including graphene oxide (GO), graphitic carbon nitride (CN), and their nanohybrids (GO@CN) are used for enhancing the corrosion resistance of waterborne epoxy coatings. The nanomaterials functionalized with 3-aminopropyltriethoxysilane are loaded in the waterborne epoxy matrix by solution mixing method through probe-sonication and mechanical mixing. The corrosion resistance of the pure waterborne epoxy (PE) and the nanocomposite coatings in 3.5 wt% NaCl solution is evaluated by electrochemical impedance spectroscopy and salt spray test; revealing that the epoxy coating loaded with 0.1 wt% silane functionalized GO@CN nanohybrid has the highest chemical stability and corrosion resistance, due to the well-distribution of the nanohybrid in the polymer matrix. This research exhibits the importance of developing nanocomposite coatings based on two dimensional nanohybrids to overcome the shortcomings of the nanomaterials and to simultaneously utilize from their advantages in a coating system.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
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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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高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
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2020
·Vol. 31
·期 1
·375-383
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IF 1.941
Xu Gengsheng,You Fangfang,Li Xu
Considering the accelerated charge/mass transfer and the formation of active defects at the heterointerface, La-ZnO/g-C 3 N 4 heterogeneous photocatalysts were facilely prepared via a two-step route consisting of hydrothermal and calcination processes in this work. The combination of La 3+ doping in ZnO and the contact between La-ZnO and g-C 3 N 4 endowed the heterogeneous composite with a much enhanced photocatalytic activity towards methyl blue (MB) dye decolorization under the visible light irradiation. It was found that La-ZnO/g-C 3 N 4 -4.6 showed an optimal degradation rate of MB (8.72 × 10 − 2 min − 1 ), which is 14 times higher than that of pure g-C 3 N 4 (6.23 × 10 − 3 min − 1 ) under the same experimental conditions. The improved photocatalytic MB decolorization is attributed to the increased interfacial electron-hole separation efficiency through constructing La-ZnO/g-C 3 N 4 heterogeneous interfaces. The present study manifests the advantage of heterogeneous interfaces as the charge carrier separation pathway towards boosting photocatalytic activity.
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高影响因子
Journal of Environmental Chemical Engineering
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2020
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IF 4.3
Xing Chen,Xu-Xu Ke,Yao Liu,Rohan Weerasooriya,Heng Li,Yu-Cheng Wu
Chromium readily undergoes redox speciation, and Cr(VI) oxidation state is ubiquitous and mobile in the environment. Under physiological conditions, Cr(VI) reduction yields species as Cr(V) or Cr(VI), which shows reactivity towards DNA damaging. Therefore, accurate detection of Cr species in the environmental compartment is of utmost importance. In compliance with green chemistry, Au/mpg-C 3 N 4 nanocomposites were successfully fabricated by ultra-violet photo-reduction without a reducing agent. The Au/mpg-C 3 N 4 nanocomposites were characterized by scanning electron microscope (SEM), X-ray diffractometry (XRD), X-ray photoelectron spectrometry (XPS), and infrared spectrophotometry. Well-dispersed gold nanoparticles with an average diameter of 50 nm decorated on mpg-C 3 N 4 . We developed a method to determine Cr(VI) with excellent sensitivity (0.002196 μA/ppb) and detection limit (14.7 ppb) using Au/mpg-C 3 N 4 modified glassy carbon working electrode by linear sweep voltammetry (LSV). The same electrode can use in real-time Cr(VI) monitoring using amperometry. The new sensor is stable and free from interferences from other species in natural water, and it can also be used in real-time Cr(VI) monitoring over wide concentration ranges.
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RESEARCH ON CHEMICAL INTERMEDIATES
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2021
·Vol. 47
·期 4
·1471-1487
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IF 2.914
Zheng Wei,Feng Sheng,Feng Shanshan,Shao Cong,Jiang Zhenfei,Wu Wei,Ge Yunjie,Liao Shenyu,Li Kunjie,Duan Chunying,Meng Qi
In this work, a ternary complex (g-C 3 N 4 /ZIF-8/AgBr) was prepared by modifying the surface of the protonated graphitic carbon nitride (g-C 3 N 4 ) with photosensitive AgBr and zeolitic imidazolate framework-8 (ZIF-8), and its physicochemical parameters, crystal morphology and electrochemical properties were characterized using a series of techniques. The modified g-C 3 N 4 not only improves the ability to capture pollutants in water, but also efficiently catalyzes the degradation of bisphenol A (BPA) in water by rapidly producing superoxide radicals ( · O 2 − ), cavitation (h + ) and hydroxyl radicals ( · OH) in visible light, with the removal efficiency reaching 80.4%. The activity of catalytic degradation of BPA from strong to weak is g-C 3 N 4 /ZIF-8/AgBr, g-C 3 N 4 /AgBr, g-C 3 N 4 /ZIF-8, AgBr, g-C 3 N 4 , ZIF-8. After four cycles of experiments, it was found that g-C 3 N 4 /ZIF-8/AgBr had still considerable degradation ability (70.2%) and stability.
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CERAMICS INTERNATIONAL
·
2020
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IF 3.83
Shaosheng Rao,Yi Li,Hanqing Liu,Shuai Gao,Jinxia Zhao,Nasir Rahman,Jinghan Li,Yazhou Zhou,Ding Wang,Lili Zhang,Qinqin Liu,Juan Yang
Improving the efficiency of Ag nanoparticles (NPs) in an antibacterial system remains a problem to be solved. Herein, a simple polyethyleneimine (PEI) modification strategy has been developed for realizing the high dispersion of Ag NPs with average size of 10 nm over two dimensional nanosheets of g-C 3 N 4 photocatalyst , and the as-prepared ternary Ag/PEI/CN hybrid demonstrates enhanced bifunctional performance of antibiotics (e.g., tetracycline, TC) degradation and antibacterial activity. The enhanced mechanism is investigated and proposed to be a synergy effect between reactive oxygen-containing species (ROS, e.g., •OH and O 2 •− ) derived from PEI modified g-C 3 N 4 photocatalyst and slow released Ag + ions generated by the highly dispersed Ag NPs as antimicrobial agent. Furthermore, the surface plasmonic effect of Ag NPs and coupling of PEI can increase light absorption and accelerate the electron-hole separation and mobility. Consequently, more availability of ROS along with holes and Ag + ions can accelerate the death of bacteria via destructing biomolecules. As a result, under visible-light irradiation, Ag/PEI/CN hybrid presents greatly improved antibacterial activity against E. coli , including a low MIC 100% of 30 ppm and MBC 97% of 10 ppm and enhanced photocatalytic performance towards TC degradation (~80% TC can be degraded within 60 min).
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高影响因子
CERAMICS INTERNATIONAL
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2020
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IF 3.83
Dongyao Lin,Yunlong Zhou,Xiaoyuan Ye,Mingyuan Zhu
The construction of sandwich structured binary composite can enlarge its specific surface and strengthen the contact of binary interface. This can enhance H 2 generation efficiency of the photocatalyst . In this study, two-step strategy for the preparation of novel sandwich-structured g-C 3 N 4 /WS 2 is proposed. Step one is hydrothermal process producing the layered WO 3 , which is used as the precursor for monolayer WS 2 . While step two involves one-pot calcination process that generates sandwich structured g-C 3 N 4 /WS 2 . X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma optical emission spectrometry (ICP-OES), Brunauer Emmett Teller method (BET), and transmission electron microscopy (TEM) are employed to characterize the composition, structure and morphology of g-C 3 N 4 /WS 2 . Photocatalytic H 2 generation tests show that the optimal H 2 generation rate of g-C 3 N 4 /WS 2 is 599.7 μmol h -1 g -1 (20 mg of photocatalyst), which is about 25 times higher than that of bare g-C 3 N 4 . Moreover, UV–vis diffuse reflectance spectroscopy (UV–vis DRS), photoluminescence (PL) and electrochemical tests are employ to establish possible mechanism of photocatalytic H 2 evolution in sandwich-structured g-C 3 N 4 /WS 2 .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Xian-Yang Sun,Feng-Jun Zhang,Cui Kong
A novel porous g-C 3 N 4 /WO 3 photocatalyst was successfully obtained by adopting urea and WO 3 ⋅0.33H 2 O as precursor by a simple hydrothermal and calcination method. The structural characteristics, photoelectric properties , and hydrogen generation efficiency of g-C 3 N 4 /WO 3 were studied. The results shows that best photocatalytic hydrogen generation efficiency of the g-C3N 4 /WO 3 was 963 μmol −1 h −1 , it was about 3 times than pure g-C 3 N 4 . Hydrated tungsten oxide promotes the formation of porous structure after removing crystal water, and the increased pore volume and pore size provide more reactive activity sites, which contribute to increase the efficiency of hydrogen generation. The mechanism of photocatalytic hydrogen generation was proposed.
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高影响因子
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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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Lei Chen,Yiming Xu,Zhi Yang,Kun Zhang,Baoliang Chen
Developing a low-cost co-catalyst for hydrogen evolution reaction (HER) on a photocatalyst is a great challenge. An open-framework material, cobalt ethylenediammonium bis(sulfate) tetrahydrate, was initially used as an efficient co-catalyst to improve photocatalytic HER of g-C 3 N 4 . The unique open‐framework cobalt(II) sulfate (Co-S) lead to twice higher H 2 evolution performance (10328.9 μmol g −1 h -1 ) compared to noble metal (Pt)-decorated g-C 3 N 4 photocatalyst under simulated sunlight. The open network structure provides abundant active sites and excellent electron transport properties, properties and then promotes electron-hole separation, which play a synergistic role with g-C 3 N 4 in the photocatalytic process. The loading of Co-S significantly changes the microenvironment of the catalyst surface of g-C 3 N 4 and enhances its hydrophilicity, which benefits the release of the produced gas on the catalyst surface. The formation of the Co(Ⅰ) species in the open-framework material by the electron reduction of Co(Ⅱ) is proposed as a vital role in the extraordinary HER process.
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FUEL
·
2020
·
IF 5.578
Yong-Ting Li,Xiao-Li Zhang,Zhi-Kun Peng,Pu Liu,Xiu-Cheng Zheng
The hydrolysis of solid storage compounds including ammonia borane (NH 3 BH 3 ) is promising for the upcoming hydrogen economy. So, developing highly efficient heterogeneous catalysts for the hydrolysis of ammonia borane is one of the key issues since this reaction is not kinetically feasible at room temperature. In this work, a facile adsorption- in situ reduction method is adopted to stabilize the ultrafine bimetallic RuPd nanoparticles on an ultrathin porous graphite carbon nitride. Due to the synergistic alloying effect, most of the resultant bimetallic Ru 1- x Pd x /g-C 3 N 4 catalysts possess much higher catalytic activity than the monometallic Ru/g-C 3 N 4 and Pd/g-C 3 N 4 in the hydrolytic dehydrogenation of ammonia borane. Catalyzed by the optimal Ru 0.85 Pd 0.15 /g-C 3 N 4 , the turnover frequency and the apparent activation energy are 948.2 mol H 2 ·mol Cat -1 ·min - 1 and 24.2 kJ mol −1 , respectively, which are much superior to many catalysts previously reported. The high catalytic activity and satisfactory durability endow Ru 0.85 Pd 0.15 /g-C 3 N 4 desirable potential in the hydrogen generation from the hydrolysis of chemical storage materials.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Zhiyuan Zhou,Dong Yang,Wenjing Wang,Yao Chen,Zhanfeng Zhao,Ke An,Hanjie Ren,Zhongyi Jiang
Graphite-like carbon nitride (CN) has attracted much attention because of its distinct optical and photoelectrical properties, strong stability, and wide applications for environmental restoration and renewable energy. Herein, the CN nanolayer about 7.5–17.5 nm in thickness was in situ built uniformly on the external of carbonized PDA (cPDA) spheres to form the cPDA@CN core/shell nanomaterials on account of the bioinspired adhesion. They possess the mesopore about 4.8 nm in diameter and a high specific surface area (66.6 m2 g–1). The optimal cPDA@CN sample exhibits efficient catalytic activities for the rhodamine B degradation (2.19 h–1) and H2 release rate (630 μmol g–1 h–1), which are ∼15.4 and ∼10 times of pristine CN, respectively. This research affords a dextrous and scalable way to fabricate the nanostructured photocatalyst with superior performance, which may hold great promise in practical applications.
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