JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Bin Zhang,Jun Ma,Huizhong Chi,An Ding,Yanjun Xin,Yingying Ma,Qingliang Liu,Xu He
Given the limitations of conventional vacuum ultraviolet (VUV) systems, a novel vacuum ultraviolet/graphite carbon nitride (VUV/g-C 3 N 4 ) system with high adaptability to varying environmental conditions was developed. Compared with conventional VUV and UV/g-C 3 N 4 systems, the VUV/g-C 3 N 4 system demonstrates a much higher ability for the efficient degradation of chlorophenols (CPs). In particular, the VUV/g-C 3 N 4 system exhibits outstanding performance even at low pH and high concentrations of humic acid and SO 4 2- . Alkaline conditions and the presence of HCO 3 - can further promote CP removal. In addition, the feasibility of the VUV/g-C 3 N 4 system was verified by its stable operation in both river water and tap water . Unlike conventional photochemical systems relying on •OH, the dominant reactive species for CP degradation by the VUV/g-C 3 N 4 system was identified to be •O 2 - . This study conclusively provided a novel system for the efficient photocatalytic treatment of pollutants.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Fengyan Xie,Guofa Dong,Minghui Wu,Kechen Wu,Chunlei Huang,Shaowu Du,Yafeng Li,Mingdeng Wei,Caiyun Chen
The development of excellent ternary metal oxides as electron transporting layers (ETLs) is highly challenging for perovskite solar cells (PSCs). In this study, ZnTiO 3 (ZTO) nanoparticles are synthesized via a facile sol-gel method, and used as an ETL in PSCs. Furthermore, for the first time, iodine-doped g-C 3 N 4 (ICN) is introduced into ZnTiO 3 -based ETL as additive via a glass-assisted annealing route. Characterizations demonstrate that the ZnTiO 3 -based ETL with the addition of ICN will enhance the PCE, which is attributed to the improved crystalline quality and more favorable energy level alignment. Moreover, the existence of ICN will strengthen the interfacial cohesion between perovskite layer and ETL as well as retard the perovskite crystals from decomposing, leading to the high quality capping light-harvesting layer upon ICN-modified ZnTiO 3 (ZTO-ICN) film. Consequently, a champion device fabricated with ZTO-ICN ETL achieves a maximum PCE of 19.17 % with an open circuit voltage (V oc ) of 1.012 V, a short-circuit current density (J sc ) of 26.32 mA cm −2 and a fill factor (FF) of 0.720 under AM 1.5 G sunlight (100 mW cm −2 ).
研究领域:
材料科学
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能源技术
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光伏器件
✓ 已验证
DOI
PubMed
高影响因子
Journal of Central South University
·
2022
·Vol. 29
·期 5
·1447-1462
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IF 2.392
Yang Ting,Hu Xin-yu,Wang Jun-tao,Yang Tian-li,Wang Wen-lei
A series of In x Sb 2− x S 3 nanosheets modified g-C 3 N 4 (In x Sb 2− x S 3 -TCN) heterojunctions with different g-C 3 N 4 contents were fabricated by an in situ deposition method. All the In x Sb 2− x S 3 -TCN composites were applied as photocatalysts in Cr(VI) polluted water treatment and the results displayed that In x Sb 2− x S 3 -TCN could effectively remove Cr(VI) under visible light through synergistic effects of adsorption and photocatalytic reduction. Especially, In x Sb 2− x S 3 -TCN-70 (70 mg g-C 3 N 4 ) exhibited the most excellent adsorption and photocatalytic reduction performance among all composites, which possessed a high equilibrium adsorption capacity of 12.45 mg/g in a 30.0 mg/L Cr(VI) aqueous solution, and reduced Cr(VI) to Cr(III) within 10 min under visible light irradiation. DRS and PL results indicated that the interfacial coupling effect between g-C 3 N 4 and In x Sb 2− x S 3 enhanced the utilization efficiency of visible light and suppressed photoinduced carrier recombination, which improved the photocatalytic activity of composites. Moreover, the photocatalyst exhibited satisfactory reduction activity and good stability after 5 cycles of Cr(VI) adsorption-photoreduction.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Li Zhao,Wei Lv,Juying Hou,Yijing Li,Junling Duan,Shiyun Ai
We synthesized magnetically recyclable g-C 3 N 4 /Fe 3 O 4 /ZIF-8 nanocomposites as an emerging adsorbent for the malachite green (MG) removal in aqueous solution. Bath absorption experiments for MG were done to explore the influence (pH, adsorbent dosage and initial concentration) on its absorption process. The adsorption isotherm and kinetics followed Langmuir model and pseudo-second-order kinetic model, respectively. The thermodynamic datas (ΔG ○ < 0, ΔH ○ > 0, ΔS ○ > 0) showed that the adsorption process for MG was feasible, endothermic and spontaneous. The g-C 3 N 4 /Fe 3 O 4 /ZIF-8 nanocomposites showed excellent removal properties for MG. The maximum equilibrium adsorption capacity could reach as high as 3412 mg/g. The g-C 3 N 4 /Fe 3 O 4 /ZIF-8 nanocomposites could be easily separated using an external magnet, and the nanocomposites could be repeatedly utilized after five cycles. The ultra-high adsorption capacity, easy separation, and excellent recyclability enabled the obtained g-C 3 N 4 /Fe 3 O 4 /ZIF-8 nanocomposites a good adsorbent for the adsorption of MG.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Junhua You,Wanting Bao,Lu Wang,Aiguo Yan,Rui Guo
As an effective method to solve the environmental crisis and energy reserve problems, visible light-driven photocatalysts have attracted widespread attention. Various semiconductor materials (such as WO 3 , CdS, g-C 3 N 4 , Ag 3 PO 4 and BiVO 4 ) have been used as photocatalysts. Therefore, in this work, CdS/C 3 N 4 composite photocatalysts were prepared by simple co-precipitation method to improve the performance of CdS, and Rhodamine B (RhB) was used to evaluate the photocatalytic activity. The results show that the composite photocatalyst containing 20% CdS has the highest photocatalytic activity. In addition, the effects of different temperatures on the properties of the samples were investigated by heat treatment. It shows that the properties of 20% CdS/C 3 N 4 (CS-20) are greatly improved after heat treatment, due to the multiphase structure.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2014
·
IF 2.235
Fa-tang Li,Ya-bin Xue,Bo Li,Ying-juan Hao,Xiao-jing Wang,Rui-hong Liu,Jun Zhao
Mesoporous γ-Al2O3 with high surface area (159 m2/g) is prepared via a precipitation method. The as-synthesized Al2O3 exhibits optical absorption ability in the ultraviolet region and is used as the active component to be combined with g-C3N4 to form effective heterostructured photocatalysts. This heterojunction structure is confirmed by X-ray diffraction, scanning electron microscopy, element map, transmission electron microscopy, high-resolution transmission electron microscopy, Fourier transform infrared, and X-ray photoelectron spectroscopy measurements. The photocatalytic performances of the composites are evaluated by the degradation of rhodamine B (RhB) and methyl orange (MO). Among the prepared photocatalysts, 2g-C3N4:1Al2O3 (weight ratio) exhibits the highest photocatalytic activity, the reaction rate constant of which is 2.5 and 3.7 times that of pure g-C3N4 in degradation of RhB and MO, respectively. The enhancement in activity of heterojunctions is ascribed to their high specific surface areas, excellent adsorption abilities for dyes, and efficient transfer of photogenerated electrons from the lowest unoccupied molecular orbital of g-C3N4 to the defect sites of γ-Al2O3.
研究领域:
材料科学
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光催化
·
纳米材料
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表面化学
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环境功能材料
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2013
·
IF 2.98
Xuefeng Hu,Huanhuan Ji,Fei Chang,Yongming Luo
In this study, a rapid reduction of Cr(VI) and degradation of 2,4,6-trichlorophenol (2,4,6-TCP) in a simultaneous manner was reported through the catalysis of g-C 3 N 4 under visible light ( λ > 420 nm) irradiation. The effects of initial concentration of reactants, dissolved O 2 and pH value were investigated systematically. It indicated that, under the optimized concentration, the Cr(VI) reduction and 2,4,6-TCP oxidation could be accomplished in couple of hours in the presence of g-C 3 N 4 . And also, the O 2 involvement and low pH value were able to significantly improve the removal rate of Cr(VI) and 2,4,6-TCP. In addition, the reaction mechanism was investigated through monitoring the reduced states of Cr(VI) and active oxygen intermediates formed during photoreaction by ESR and XPS, as well as determining the degradation products of 2,4,6-TCP by HPLC–MS. The results supported that the redox reactions of Cr(VI) and 2,4,6-TCP can be performed simultaneously via a synergistic oxidation–reduction mechanism in the presence of g-C 3 N 4 under visible light irradiation.
研究领域:
环境科学
·
光催化材料
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Xiaomeng Gu,Taijie Chen,Jian Lei,Yang Yang,Xiuzhen Zheng,Sujuan Zhang,Qiushi Zhu,Xianliang Fu,Sugang Meng,Shifu Chen
To realize the high-efficiency photodegradation of antibiotics, a novel S-scheme heterojunction photocatalyst g-C 3 N 4 /Bi 8 (CrO 4 )O 11 was proposed and successfully prepared in this work. The 10% g-C 3 N 4 /Bi 8 (CrO 4 )O 11 heterojunction exhibits the highest degradation rate of norfloxacin (NOR) and bisphenol A (BPA). The degradation rate of NOR on 10% g-C 3 N 4 /Bi 8 (CrO 4 )O 11 is about 1.38 and 2.33 times higher than that of pure Bi 8 (CrO 4 )O 11 and g-C 3 N 4 , respectively. Further, the degradation rate of BPA over 10% g-C 3 N 4 /Bi 8 (CrO 4 )O 11 heterojunction is bout 1.35 and 9.11 times higher than that of pure Bi 8 (CrO 4 )O 11 and g-C 3 N 4 , respectively. The formation of S-scheme heterojunction facilitates the separation of photogenerated electron-hole pairs and reduces the recombination of charge carriers, which was confirmed by photocurrent, electrochemical impedance spectroscopy, steady-state and time-resolved transient photoluminescence spectrum, etc. The in-situ X-ray photoelectron spectroscopy, radical trapping experiments and electron paramagnetic resonance results demonstrate that the charge transfer is in accord with S-scheme mechanism.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Lingli Wang,Xu Guo,Yingying Chen,Shasha Ai,Hanming Ding
Cobalt-mediated peroxymonosulfate (PMS) activation is an effective way to generate sulfate radicals for the degradation of pollutants. Herein, a heterogeneous Co-based catalyst was prepared by integrating the cobalt species to the cavities of g -C 3 N 4 via the Co N bonds through the methods of impregnation and calcination, which was applied to activate PMS for the degradation of organic contaminates under visible light. The cobalt species were atomically dispersed on g -C 3 N 4 , which could provide more reactive sites for PMS activation. The catalytic efficiency of cobalt-doped g -C 3 N 4 was greater than that of pure g -C 3 N 4 or even slightly higher than that of the homogeneous cobalt ions during the photo-assisted PMS activation catalytic processes. The optimum Co loading is 1.0% in weight. In 25 min, the dye of rhodamine B was almost completely degraded with a 70.5% of total organic carbon (TOC) removal under its natural pH value in the presence of such catalytic system. The enhanced catalytic activity of Co-doped g -C 3 N 4 was due to the effective separation of the photo-generated charges as well as the sufficient accessible reactive sites for PMS activation. And the synergistic interaction between the photocatalytic and PMS activation processes facilitated the generation of active species for the removal of pollutants.
研究领域:
环境科学
·
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
·
2019
·
IF 2.155
Hu Jingyu,Yang Ran,Li Zhaohui,Sun Yuanqiang,Qu Lingbo,Alexander Nti Kani
The zinc oxide/graphitic carbon nitride (ZnO/g-C 3 N 4 ) heterostructured nanocomposite was successfully synthesized by a facile two-step process involving thermal condensation of melamine and hydrothermal in situ growth of globular zinc oxide (ZnO) nanoparticles on the surface of graphitic carbon nitride (g-C 3 N 4 ). The morphologies, chemical compositions, and optical properties of the prepared ZnO/g-C 3 N 4 were investigated via a series of characterization techniques. SEM and TEM validate the grafting of ZnO globular with a diameter of 40–50 nm on the surface of g-C 3 N 4 . The visible photodegradation activity of the nanocomposite was assessed via tetracycline and oxytetracycline as target pollutants. Under visible light irradiation, 15 wt% ZnO globular-g-C 3 N 4 exhibits high photocatalytic activity with 78.4% of tetracycline degraded in 50 min and 63.5% of oxytetracycline in 50 min which was much faster photocatalytic degradation efficiency than that of the reported materials. Reactive species scavenging experiments revealed that photogenerated holes are the main reason for the photocatalytic degradation. After six recycles, the ZnO globular-g-C 3 N 4 resulted in 70% degradation efficiency of TC suggesting its high stability and reusability. This work proved a new insight for constructing novel high-performance photocatalysts for TC degradation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Liping Zhang,Guohong Wang,Zhenzhong Xiong,Hua Tang,Chuanjia Jiang
A combined hydrothermal-calcination approach is developed to synthesize hierarchical β -Bi 2 O 3 /g-C 3 N 4 direct Z-scheme photocatalyst with enhanced visible light photoactivity for Rhodamine B (RhB) degradation. First, Bi 2 O 2 CO 3 microflowers were hydrothermally prepared using Bi(NO 3 ) 3 ·5H 2 O as feedstocks, and then a series of β -Bi 2 O 3 /g-C 3 N 4 direct Z-scheme photocatalysts were synthesized via a facile calcination method using Bi 2 O 2 CO 3 and g-C 3 N 4 as precursors. The samples were systematically characterized by various characterization technologies including X-ray diffraction, scanning and transmission electron microscopes, Fourier transform infrared spectroscopy and N 2 absorption-desorption equipment. It was found that the g-C 3 N 4 content in the precursors played a key role in affecting the photocatalytic activity of the final products. The β -Bi 2 O 3 /g-C 3 N 4 heterojunction exhibited higher photocatalytic activity than single active components ( β -Bi 2 O 3 and g-C 3 N 4 ), indicating the presence of a synergistic effect between two active components in β -Bi 2 O 3 /g-C 3 N 4 heterojunction. Among all as-prepared catalysts, the 70 wt.% g-C 3 N 4 /Bi 2 O 2 CO 3 exhibits the highest activity for RhB degradation, and the apparent reaction rate constant k (42.2 × 10 −3 min −1 ) is 3.1 and 1.7 times as high as that of pure β -Bi 2 O 3 (13.5 × 10 −3 min −1 ) and g-C 3 N 4 (25.2 × 10 −3 min −1 ), respectively. The enhanced photocatalytic performance of β -Bi 2 O 3 /g-C 3 N 4 heterostructure photocatalysts is mainly due to the high surface area, closely contacted interfaces between the β -Bi 2 O 3 and g-C 3 N 4 component, and the formation of direct Z-scheme structure in the β -Bi 2 O 3 /g-C 3 N 4 composites.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2018
·Vol. 8
·期 14
·3484-3492
·
IF 5.365
Xing Ding,Dong Xiao,Lei Ji,Ding Jin,Ke Dai,Zixin Yang,Shengyao Wang,Hao Chen
The construction of a multifunctional two-dimensional (2D) composite photocatalyst is of great significance because such a composite can exhibit enhanced catalytic performance and improved practical usability in contrast to a single component catalyst. Herein, a ternary photocatalyst composed of g-C3N4, a carbon layer (C), and Fe3O4 nanoparticles was successfully synthesized by a facile one-pot hydrothermal carbonization (HTC) method from g-C3N4, glucose, and FeCl3. The resultant composite, Fe3O4/C/g-C3N4, had an ordered 2D heterostructure and exhibited enhanced visible-light-driven photocatalytic performances and good magnetic recyclability. The kobs for Cr(VI) photoreduction (or dimethoate photodegradation) over Fe3O4/C/g-C3N4 was 20.9-fold (or 2.1-fold) of that over g-C3N4. Comparative study of Fe3O4/C/g-C3N4, C/g-C3N4, and g-C3N4 on their optoelectronic properties revealed that this enhanced photocatalytic activity was mainly due to rapid photogenerated electron transport from the g-C3N4 component to carbon and/or Fe3O4, which effectively suppressed the recombination of photogenerated electrons and holes. In addition, the good surface adsorption capacity of the carbon component towards Cr(VI) also contributed to Cr(VI) photoreduction over Fe3O4/C/g-C3N4. Finally, a reasonable photocatalytic reaction mechanism of Fe3O4/C/g-C3N4 was proposed based on the results of trapping experiments. This study is not only limited to developing a high-performance g-C3N4 based photocatalyst, but also expected to provide a green, facile, and cost-efficient strategy to combine 2D materials with a carbonaceous layer and other functional components for a multifunctional system.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）