Materials Chemistry Frontiers
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2022
·Vol. 6
·期 14
·1964-1972
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IF 8.683
Mingrui Guo,Meng Chen,Jixiang Xu,Jing Wang,Lei Wang
The intramolecular doping of donor units or acceptor units in carbon nitride (g-C3N4, CN) is regarded as an effective method for regulating electron structure and enhancing the catalytic activity of CN. Herein, benzene rings and eosin Y (EY) co-grafted CN with carbon vacancies (EY-PhCN) was prepared by calcining a supermolecular precursor consisting of melamine, cyanuric acid, and benzonquanmine followed by covalently hooking the EY. Theoretical and experimental results demonstrated the directional electron transfer, spatially isolated electron–hole pairs and increased light response in the resulting ultrathin holey EY-PhCN. An optimal H2 production rate of 4.44 mmol g−1 h−1 was obtained over the 1%Pt-loaded EY-PhCN catalyst. The corresponding apparent quantum yield was 27.38% at 420 nm. Moreover, the EY-PhCN exhibited high CO2 reduction rate with H2O. The yields of CO and CH4 were 61.91 and 13.75 μmol g−1, respectively within 5 h light irradiation, higher than that of CN (CO: 24.60 μmol g−1, CH4: 8.51 μmol g−1). The work may give new insight into associating carbon vacancies and edge decoration on CN to achieve remarkably enhanced photocatalytic activity.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Ding Wang,Shimeng Huang,Huijun Li,Aiying Chen,Ping Wang,Jing Yang,Xianying Wang,Junhe Yang
In this work, ultrathin WO 3 nanosheets were prepared by self-assembly approach and their phase and morphology were regulated by changing the heat treatment temperature. Then, g-C 3 N 4 modified WO 3 nanosheets sensitive material was fabricated via a facile liquid ultrasonic mixing method. The microstructure, morphology, chemical composition, oxidation state and surface area of WO 3 nanosheets and g-C 3 N 4 /WO 3 nanocomposite were comparatively studied by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Transmission Electron Microscope (TEM), X-ray Photoelectron Spectroscopy (XPS), and Brunauer-Emmett-Teller (BET). Sensing performances of WO 3 nanosheets and g-C 3 N 4 /WO 3 composite with different g-C 3 N 4 loading amount were investigated with acetone as a target gas. Compared to WO 3 nanosheets, the g-C 3 N 4 /WO 3 gas sensor exhibits good response, excellent selectivity, transient response and trace detection ability to acetone vapor. Effects of g-C 3 N 4 content on gas sensitivity were also investigated. The response (R a /R g ) of the gas sensor based on 1 wt% g-C 3 N 4 /WO 3 was 35 toward 100 ppm acetone at 340 °C, which was about 300% higher than the response value of pure WO 3 sensor. The sensor also showed a fast response/recovery speed (9 s/3.8 s) and a wide linear detection range (from 0.5 ppm to 500 ppm). These unique sensing properties were attributed to the synergistic effects including the contribution of WO 3 ultrathin nanosheets, suitable crystal phase and porous surface, and the sensitization of g-C 3 N 4 , which increases the specific surface area and regulates the electrical properties. This work will contribute to the development of new acetone sensors and expand the application of g-C 3 N 4 composite materials.
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Journal of Cleaner Production
·
2021
·
IF 9.297
Xiaoying Chen,Jianlong Wang
Penicillin G (PG), a frequently detected β-lactam antibiotic in aquatic environment, has attracted extensive concerns because of its extensive application and potential to develop antimicrobial resistance. In this study, gamma radiation was used to degrade PG in water. The main influencing factors, such as initial PG concentration, pH value, absorbed dose, as well as water matrix (inorganic anions and organic matters) were investigated. Results showed that lower initial concentration, acidic condition (pH = 5.57), and higher absorbed dose was conducive to PG degradation. Besides, NO 3 − , HCO 3 2− , SO 4 2− and HPO 4 2− had negative influence on PG degradation, while Cl − had positive influence. Organic matters had negative influence. Twelve transformation intermediate products (TPs) were identified during PG degradation. Together with the density functional theory (DFT) calculation, four possible pathways of PG degradation were proposed. The results of antibacterial activity test demonstrated that the transformation of PG to TPs eliminated the antibacterial activity. Notably, except some para-modified products of PG, the toxicity of other TPs was reduced PG degradation. Moreover, no potential risk of bacterial mutagenicity during PG degradation was observed. In summary, ionizing radiation has good performance in PG degradation in the real wastewater .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Shiyu Zuo,Haiming Xu,Wei Liao,Xiangjuan Yuan,Lei Sun,Qiang Li,Jie Zan,Dongya Li,Dongsheng Xia
A novel heterojunction composite photocatalyst, g-C 3 N 4 -Cu 2 O, was fabricated via a high-temperature solid-phase molten salt method, hydrothermal method, and high-temperature calcination method. The structures and properties of as-synthesized samples were characterized using a range of techniques, such as X-ray photoelectron spectroscopy, scanning electron microscopy, UV–vis diffuse reflectance spectra and the Brunauer Emmet Teller (BET) theory. Their photocatalytic activity was evaluated based on the degradation of methyl orange (MO) under visible light irradiation. Based on the results obtained via TEM, XPS, EPR, and the other techniques, we verified that a heterojunction had formed. The g-C 3 N 4 -Cu 2 O heterojunction had the largest specific surface area, which provided plentiful activated sites for photocatalytic reaction. Moreover, g-C 3 N 4 -Cu 2 O showed the highest photocurrent effect and the minimum charge-transfer resistance. Furthermore, the g-C 3 N 4 -Cu 2 O heterojunction exhibited the highest MO photodegradation rate. After a series of radical trapping experiments and EPR analysis, we demonstrated that the holes and O 2 − radicals could be the main active species involved in MO photodegradation. The molten-salt process can improve the BET surface area to form abundant heterojunction interfaces, which serve as channels for photogenerated carrier separation and thereby enhance its light utilization and quantum efficiency.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 98
·期 9
·2136-2145
·
IF 3.4
Long Wang,Liu-Lin Zhao,Qin-Yuan He,Dan-Dan Shao,Shi-Peng Sun,Xue-Li Cao
BACKGROUND Desalination membranes have been widely in demand for separating dyes and salts. However, dyes are easily adsorbed on/in the membranes, deteriorating membrane performance. Coupling photocatalysis and membrane separation might be a promising strategy for efficiently alleviating membrane fouling. Aiming at the defects of single catalyst, this work constructed photocatalytic membranes based on heterostructured Fe 3 O 4 -doped g-C 3 N 4 (FeCN)/TiO 2 catalysts by successively filtrating FeCN aqueous dispersion and titanium butoxide/isopropanol solution on the hydrolyzed polyacrylonitrile substrate. RESULTS The H-bonds among TiO 2 , FeCN and substrate lead to excellent load stability of the photoresponsive layer. Due to the low-potential conduction band and high conductivity of Fe 3 O 4 and the low-potential conduction band of TiO 2 in FeCN/TiO 2 , electrons can be more easily transferred to guarantee the high separation efficiency of electrons and holes. Hence the membrane not only exhibited superior permeability (104 L m −2 h −1 bar −1 ) and dye desalting performance (Coomassie brilliant blue R250 rejection of >98.80% and NaCl rejection of <7.00%), but also displayed highly efficient and stable dye photodegradation. CONCLUSION The degradation efficiency surpassed that reported in the literature in comparable circumstances, and the recovery rate of permeability still reached 89.12% after three fouling–photodegradation cycles. This work provides new opportunities for designing high-efficiency self-cleaning membranes to solve membrane fouling based on low-cost materials. © 2023 Society of Chemical Industry (SCI).
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CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Yuqiu Shao,Chengcan Liu,Huirong Ma,Jingjing Chen,Chenlong Dong,Dajian Wang,Zhiyong Mao
In this paper, four types of graphitic carbon nitride (g-C 3 N 4 ) are prepared from different precursors by thermal polycondensation method and the piezocatalytic performance difference of the obtained g-C 3 N 4 materials are investigated in detail. g-C 3 N 4 derived from thiourea delivers best piezocatalytic performance basing on KMnO 4 reduction experiment and rhodamine B degradation experiment. According to the differences of piezocatalytic performance of these g-C 3 N 4 materials, effects of morphology, composition and defects on piezocatalytic performances are discussed. Reactive oxygen species (ROS) capture experiment showed that g-C 3 N 4 could produce ROS through piezoelectric effect and hydroxyl radical (•OH) played a major role in pollutant degradation.
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Materials Research Express
·
2017
·Vol. 4
·期 1
·015603
·
IF 1.068
Bo Yu,Yongkun Liu,Guohua Jiang,Depeng Liu,Weijiang Yu,Hua Chen,Lei Li,Qin Huang
In this paper, the electrospun Ag nanoparticles and g-C3N4 (Ag/g-C3N4) loaded composite carbon nanofibers were successfully prepared combing the electrospinning technology and carbonization treatment. The composition and microstructure of the resultant composite nanofibers were characterized by x-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive spectrometer (EDS), transmission electron microscopy (TEM) and x-ray photoelectron spectrometry (XPS). Due to the synergistic effect between catalytic activity of Ag nanoparticles (NPs) and g-C3N4 and excellent adsorption capacity of carbon nanofibers, the resultant electrospun Ag/g-C3N4 loaded composite carbon nanofibers exhibited excellent conversion of 4-nitrophenol to 4-aminophenol and benzylamine to N-benzylbenzaldimine. The resultant hybrid carbon composite nanofibers offer the significant advantages, such as low dosage, high catalytic activity, easy recycling and excellent stability.
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ACS Omega
·
2024
·
IF 3.7
Kexin Zhang,Rui Wang,Xin Zhong,Fubin Jiang
Rapid recombination of photogenerated electrons and holes affects the performance of a semiconductor device and limits the efficiency of photocatalytic water splitting for hydrogen production. The use of an S-scheme nanoscale heterojunction catalyst for the separation of photogenerated charge carriers is a feasible approach to achieve high-efficiency photocatalytic hydrogen evolution. Therefore, we synthesized a three-dimensional S-scheme nanoscale heterojunction catalyst (LaNi0.6Fe0.4O3/g-C3N4) and investigated its activity in photocatalytic water splitting. An analysis of the band structure (XPS, UPS, and Mott–Schottky) indicated effective interfacial charge transfer in an S-scheme nanoscale heterojunction composed of two n-type semiconductors. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) spectroscopy confirmed that the light-induced charge transfer followed the S-scheme mechanism. Based on the capture test (EPR) of •OH free radicals, it can be seen that the enhanced activity is attributed to the S-scheme carrier migration mechanism in heterojunction, which promotes the rapid adsorption of H+ by the abundant amino sites in g-C3N4, thus effectively generating H2. The 2D/2D LaNi0.6Fe0.4O3/g-C3N4 heterojunction has a good interface and produces a built-in electric field, improving the separation of e– and h+ while increasing the oxygen vacancy. The synergistic effect of the heterostructure and oxygen vacancy makes the photocatalyst significantly better than LaNi0.6Fe0.4O3 and g-C3N4 in visible light. The hydrogen evolution rate of the composite catalyst (LaNi0.6Fe0.4O3/g-C3N4-70 wt %) was 34.50 mmol·h–1·g–1, which was 40.6 times and 9.2 times higher than that of the catalysts (LaNiO3 and g-C3N4), respectively. After 25 h of cyclic testing, the catalyst (LaNi0.6Fe0.4O3/g-C3N4-70 wt %) composite material still exhibited excellent hydrogen evolution performance and photostability. It was confirmed that the synergistic effect between abundant active sites, enriched oxygen vacancies, and 2D/2D heterojunctions improved the photoinduced carrier separation and the light absorption efficiency of visible light. This study opens up new possibilities for the logical design of efficient photodecomposition using 2D/2D heterojunctions combined with oxygen vacancies.
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EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Suzhen Liu,Li Zhang,Xiaohong Chen,Tingting Chu,Yanzhu Guo,Meihong Niu
A novel kind of cationic cellulose- g -oligo(ε-caprolactone) amphiphilic polymer (QC- g -OCL) was obtained by homogeneous ring-opening polymerization of ε-caprolactone (ε-CL) from quaternized cellulose (QC) in 1-butyl-3-methylimidazolium chloride (BmimCl) ionic liquids. Chemical structures and properties of the copolymers were characterized by FT-IR, 1 H NMR, 13 C NMR, XRD and TGA techniques. The grafting ratios of OCL chain onto QC- g -OCL were adjusted by changing the molar ratio of CL to QC. The micelles self-assembled from QC- g -OCL were prepared by ultrasonic-assisted dissolution method, and comprehensively analyzed by dynamic light scattering (DLS), TEM and fluorescence spectroscopy techniques. The micelles were in spherical shape with average hydrodynamic radiuses (R h ) in the range of 170–237 nm. Moreover, their critical micelle concentration (CMC) values were decreased from 0.302 mg/mL to 0.089 mg/mL with increasing the degree substitution values of OCL (DS OCL ) from 0.16 to 0.60. The ζ-potentials of micelles in water were ranged from 37.2 mV to 48.3 mV, indicating that the shells of micelles were constituted by ationic quaternary ammonium group. All of these findings established that the cationic cellulose-based micelles would be a promising aqueous carrier for hydrophobic drug.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hemiao Wang,Yurui Wang,Xin Li,Xiaolian Liu,Xin Zheng,Yueqin Shi,Minxuan Xu,Jian Zhang,Qi Zhang
The insertion of a graphene interlayer between van der Waals (vdW) materials could suppress the interlayer recombination to improve interface quality and facilitate charge transport. However, its effect on photovoltaic-mode detectors has rarely been explored. Here, self-powered photodetectors based on WSe 2 /graphene/SnS 2 vdW heterojunctions were assembled and the impact of adding graphene interlayer on its performance was investigated. The p-g-n heterostructure exhibits a photovoltaic characteristic, V OC = 0.13 V and I SC = 0.12 nA under illumination of 2.98 mW/cm 2 @405 nm, lower than that of a control (WSe 2 /SnS 2 ) counterpart ( V OC = 0.19 V and I SC = 1.15 nA). Yet an FF value up to 48.16 % was obtained under an irradiation power density of 0.332 mW/cm 2 @405 nm, which is visibly higher than that of bare WSe 2 /SnS 2 vdW heterostructure . The insertion of graphene interlayer is deemed to reduce the charge traps between vdW materials that are caused by the large concentration difference of majority carriers. However, in case of vdW heterostructure, the subsequently increased leakage current makes the junction less ideal. Thereby interface engineering methods should be used with caution to tune vdW heterostructures on the nanoscale .
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JOURNAL OF CATALYSIS
·
2017
·
IF 6.844
Siyu Tan,Zipeng Xing,Jiaqi Zhang,Zhenzi Li,Xiaoyan Wu,Jiayi Cui,Junyan Kuang,Qi Zhu,Wei Zhou
Ti 3+ self-doped TiO 2 /g-C 3 N 4 mesostructured nanosheets heterojunctions (Ti 3+ -TiO 2 /Meso-g-C 3 N 4 ) have been prepared via calcination-sonication assisted method using amino cyanamide as precursors, combined with a solid-state chemical reduction method. The Ti 3+ -TiO 2 /Meso-g-C 3 N 4 heterojunctions with narrow band gap of ∼2.21 eV possess relative high surface area of ∼73.8 m 2 g −1 , and large pore size of ∼10 nm. Remarkably, the Ti 3+ -TiO 2 /Meso-g-C 3 N 4 heterojunctions exhibit excellent visible-light-driven photocatalytic activity for degradating phenol in wastewaters. The photocatalytic hydrogen production rate of Ti 3+ -TiO 2 /Meso-g-C 3 N 4 heterojunctions rise to ∼290.2 μmol h −1 g −1 , which is about 4 and 14 times higher than that of the bare Meso-g-C 3 N 4 and TiO 2 , respectively. The enhanced photocatalytic activity may be ascribed to the synergetic effect of the mesoporous structure providing sufficient surface active sites, and Ti 3+ self-doping and the formed heterojunctions promoting the spatial separation of photogenerated electron-hole pairs.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 1
·1-13
·
IF 2.8
Yao Sheng,Wu Hao,Meng Fanming
The composite microspheres of Bi 2 MoO 6 @g-C 3 N 4 with the hollow structure were synthesized by the template method and hydrothermal method. The characterization and analysis of the experimental results showed that compared with the single component, when the content of g-C 3 N 4 in the composite was 1%, it had excellent light absorption ability and the kinetic constant of photodegradation was 0.0209 min −1 which was 3.87 and 6.53 times higher than that of g-C 3 N 4 and Bi 2 MoO 6 , respectively, greatly improving the photocatalytic performance. The improved photocatalytic performance is attributed to the construction of the hollow sphere structure and its composite forming a heterojunction, which effectively promotes electron–hole separation and transfer. The composite photocatalyst exhibited good photochemical stability in cycling tests under simulated sunlight irradiation.
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