NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 17
·6753-6764
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IF 3.069
Qiannan Li,Yuguo Xia,Kangliang Wei,Xiaotong Ding,Shun Dong,Xiuling Jiao,Dairong Chen
Utilizing surface polarization to improve the separation efficiency of photoinduced carriers is considered to be an effective strategy to enhance the photocatalytic activity. Herein, a novel nonprecious metal-based P-doped g-C3N4 (PCN)/polyaniline (PANI)/BaTiO3 (BTO) (PPB) ternary photocatalyst with a hollow architecture was rationally designed and prepared by a combined wet-chemical and thermal treatment strategy. Except for the Z-scheme involved in PCN and PANI, the vertical polarization provided by ferroelectric BTO further improved the separation efficiency of the photoinduced charge carrier, resulting in an enhanced visible-light photocatalytic hydrogen production activity of 602 μmol h−1 g−1, which was 21-fold higher than that of pristine g-C3N4, and an apparent quantum efficiency of 4.16% at 420 nm. In addition, benefitting from this ternary heterojunction, the photoinduced electrons were concentrated on the intermediate p-type PANI while holes were left on the lateral n-type PCN involved in the Z-scheme, resulting in the retention of high oxidation–reduction potentials. Moreover, this approach to enhance the photocatalytic activity by constructing a Z-scheme heterojunction and surface polarization could expand to other photosystems, which provides a new avenue for the rational design and the synthesis of novel photocatalysts.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2020
·
IF 3.085
Junnan Qu,Yi Du,Yibing Feng,Jianyong Wang,Bo He,Minxing Du,Yang Liu,Nan Jiang
A visible-light-responsive hybrid photocatalyst , K-doped g-C 3 N 4 /BiOBr, has been synthesized by K-doped g-C 3 N 4 (K–CN) and BiOBr. The property of photocatalysts was characterized by XRD , FT-IR, TEM, SEM , DRS , PL , EIS and HPLC. The photocatalytic activity of K-doped g-C 3 N 4 /BiOBr was evaluated by degradation of Rhodamine B (RhB) and tetracycline hydrochloride under visible-light irradiation. The K-doped g-C 3 N 4 /BiOBr hybrid photocatalyst which contains K–CN with mass fraction of 20% (20K–CN/BiOBr) shows the best degradation efficiency of RhB. The degradation efficiency of RhB (20 mg/L) can be achieved to 99% and the degradation efficiency of tetracycline hydrochloride by BiOBr decreased with the increase of K-doped g-C 3 N 4 doping. The results of photocurrent and EIS assumed that the tight coupling between K–CN and BiOBr can enhance the separating efficiency of photo-generated carrier. In addition, the capture experiment proof that h + is the primary active substance in the system of reaction and ·OH is the auxiliary active substance. After five degradation experiments, the efficiency of the degradation of Rhodamine B by the sample can still reach 90%, which proves that the samples are stable. A new and efficient method is provided in this work to solve the pollution of organic dyes and antibiotics.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Bingqing Wei,Jiayi Luo,Shiya Lin,Zifan Li,Xiang Zhu,Zhimin Dong,Songtao Xiao,Xiaohong Cao,Yunhai Liu,Zhibin Zhang
Photocatalytic uranium extraction from nuclear effluent is a promising method to avoid environmental damage and recover uranium resources. Here, the hollow tubular D-A organic semiconductor photocatalyst was fabricated by grafting 2,7-dibromo carbazole (Dbc) onto the g-C 3 N 4 (TCN) framework. The intra-molecular D-A system promoted visible light absorption, enhanced charge transfer, and improved the separation of photogenerated electron-hole pairs. Additionally, the incorporation of the carbazole structure increased the volume separation and the surface separation, adjusted the electron excitation model, and reduced the energy required for exciton dissociation. The results showed that the removal rate of U(VI) by DCN 3 reached 96.4% in 120 min and 93.3% removal of U(VI) under sunlight, and it was stable and reusable with little change under sunlight and after 5 consecutive cycles. Therefore, the D-A photocatalyst established a high photocatalytic uranium separation efficiency under sunlight and high concentrations of interfering anions and cations. This study provides insight and guidance for a deeper understanding of photocatalytic uranium separation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Shuhui Liang,Manman He,Jingjing Guo,Jie Yue,Xipeng Pu,Bo Ge,Wenzhi Li
The BiOBr:Yb 3+ ,Er 3+ /g-C 3 N 4 (BYE/CN) p-n junction photocatalysts were successfully fabricated by a stepwise method. Experimental results show that Er 3+ /Yb 3+ were successfully doped into BiOBr lattice. As-obtained BYE/CN exhibited strong NIR light absorption and upconversion emission from NIR to UV–visible due to the upconversion transition of Er 3+ . The p-n junction was constructed due to the appropriate alignment band structure of BYE and g-C 3 N 4 , which distinctly suppresses the recombination rate of electron-hole pairs. Compared with pure BYE and CN, as-synthesized BYE/CN samples exhibit distinctly improved photoactivities under the irradiation of visible or NIR light, which can be attributed to the upconversion effect of Er 3+ and the construction of p-n junction. This result may provides a promising system for efficient harvest of the NIR light, which will contribute to the utilization of solar energy in the future.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Fengyan Xie,Guofa Dong,Kechen Wu,Yafeng Li,Mingdeng Wei,Shaowu Du
TiO 2 -based electron transport layers (ETLs) show tremendous advantages in constructing efficient perovskite solar cells (PSCs), but the power conversion efficiency (PCE) needs further improvements. Thus, in this study, graphitic carbon nitride (g-C 3 N 4 ), a typical two-dimensional material, was synthesized in-situ and introduced into TiO 2 -based ETLs as an additive via a facile glass-assisted annealing route. The results demonstrated that the addition of g-C 3 N 4 positively influenced the crystalline quality of the perovskite layers, as well as the conductivity and photovoltaic properties of the devices. Furthermore, favorable energy level alignment facilitated rapid migration of electrons and suppressed charge recombination at the interfaces. Consequently, the champion device fabricated using the g-C 3 N 4 -modified ETL achieved a maximum PCE of 20.46% owing to the remarkable improvement in the V oc , J sc , and fill factor. The PCE is approximately 20% higher than that obtained for the pristine device, i.e., 17.18%.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 16
·15267-15276
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IF 2.195
Zhang Qingji,Jing Jiangping,Chen Zhuoyuan,Sun Mengmeng,Li Jiarun,Li Yan,Xu Likun
g-C 3 N 4 is a promising material for the application in the area of photoelectrochemical cathodic protection. However, it suffers from limited light absorption and lower charge separation efficiency. In this work, a N defects and C deposition co-modified g-C 3 N 4 , C–g-C 3 N x , was prepared by NaOH-assisted sintering and ethanol-assisted hydrothermal treatment. The presence of N defects and C deposition was verified by the XRD, SEM and XPS tests. The N defects changed the band structure of g-C 3 N 4 by lowering down the conduction band position, therefore widening the light absorption range of g-C 3 N 4 . In addition, the N defects and C deposition co-modification promotes the charge transfer process of g-C 3 N 4 , leading to increased separation efficiency of the photogenerated charge carriers. Therefore, C–g-C 3 N x shows enhanced photoelectrochemical cathodic protection performance for the coupled 316L stainless steel. It can provide a photoinduced potential drop of 120 mV and a photoinduced current density of 9.1 μA cm −2 , which is three times that of pristine g-C 3 N 4 .
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iScience
·
2025
·
IF 4.1
Zhiwei Meng,Zirui Peng,Yupeng Yan,Qin Zhang,Yang Li
Photocatalytic technology is currently one of the most effective methods for removing tetracycline (TC) from the environment; however, the underlying photocatalytic mechanism remains unclear. In this study, zinc oxide quantum dots (ZnO-QDs)/hollow-sphere g-C 3 N 4 (CNHS) S-scheme heterojunction photocatalysts were synthesized for the photocatalytic degradation of tetracycline. Experimental results showed that the 7% ZnO-QDs/CNHS photocatalyst exhibited excellent TC degradation efficiency, with a removal rate of 80.2% within 15 min. Through free radical conversion pathway analysis, singlet oxygen ( 1 O 2 ) was identified as the primary active species responsible for tetracycline degradation. Further calculations indicated that the combination of holes (h + ) and superoxide radicals (O 2 − ) produces 1 O 2 , accounting for 83.28% of the total contribution. These findings provide theoretical support for 1 O 2 as the primary active species in pollutant degradation.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yihua Tang,Jingjing Chen,Xiao Wang,Xinxin Wang,Yang Zhao,Zhiyong Mao,Dajian Wang
Nitrogen atoms doping was widely recognized as the promising technique to improve the electrochemical performances of various carbonaceous materials application for energy storage devices. Herein, we reported a facial fabrication of highly N-doped graphene-like carbon (NGC) through the carbonization of a mixture containing polypyrrole and g-C 3 N 4 nanosheets , which was employed as sacrificial template and extra nitrogen source simultaneously. The resultant NGC material integrate a range of excellent features including high nitrogen contents (17.54 at%), large specific surface areas (635.73 m 2 g −1 ) and abundant mesopores with high pore volume (1.9483 cm 3 g −1 ). As anode material in Li-ions batteries, the NGC material exhibits an promising initial discharge capacity of 2749 mAh g −1 at a current density of 50 mA g −1 and encouraging cycling stability (1143 mAh g −1 after 200 cycles) as well as excellent rate performance (440 mAh g −1 at 2 A g −1 ). This feasible fabrication presents a new guidance to exploit high performance N-doped carbon materials for the applications in energy storage devices.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Islam A. Abdelhafeez,Jiabin Chen,Xuefei Zhou
Herein, we report a scalable, green and “bottom-up” approach for the synthesis of ultralight g-C 3 N 4 nanosheets . The ultralight g-C 3 N 4 nanosheets (9.6 mg cm −3 ) have been entirely synthesized in a wet atmosphere in one step without pretreatment or any other additives. The as-prepared material (UMCN-wet) appears as a foam-like exterior with ultrathin nanosheets (3.5 nm), short-order polymerization and sharp edges. The X-ray diffraction (XRD), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses confirm the formation of melon units with edge-enriched active sites. UMCN-wet exhibits a higher specific surface area (137.44 m 2 g −1 ) and pore volume (0.2076 cm 3 g −1 ), compared with that of the as-synthesized materials in the air (MCN-air) and nitrogen (MCN-N 2 ) atmospheres. The optical and electrochemical analyses reveal that UMCN-wet manifests fast photogenerated charge separation and transfer with slow decay kinetics. As a result, UMCN-wet nanosheets exhibit superb photocatalytic degradation of rhodamine B (RhB), methylene blue (MB) and methyl orange (MO) under visible light irradiation with photodegradation rate constant ( k ) of 0.17687, 0.02409 and 0.00537 min −1 , respectively. Moreover, UMCN-wet exhibits excellent stability and reusability performance. Such a sustainable approach does not only overcome the prolonged time processing, extra energy consumption and utilization of hazardous chemicals for synthesis ultrathin g-C 3 N 4 nanosheets, but also paves a new pathway for industrial upscale production with numerous expected environmental applications.
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Nano Research
·
2018
·Vol. 12
·期 2
·457-462
·
IF 7.994
Tang Shangfeng,Yin Xuepeng,Wang Guanyu,Lu Xiuli,Lu Tongbu
A visible-light-response, efficient and robust photo-catalyst for CO 2 reduction is highly desirable. Herein, we demonstrate that single titanium-oxide species implanted in two-dimensional (2D) graphitic carbon nitride (g-C3N4) matrix (2D TiO-CN) can efficiently photo-catalyze the reduction of CO 2 to CO under the irradiation of visible light. The synergistic interaction between single titanium oxide species and g-C3N4 in 2D TiO-CN not only enhances the separation of photo-excited charges, but also results in visible light response of single titanium-oxide species, realizing high activity of CO 2 photo-reduction with extremely high CO generation rate of 283.9 μmol·h −1 ·g −1 , 5.7, 6.8 and 292.2 times larger than those of TiO 2 /CN hybrid material, CN and commercial TiO 2 , respectively. Time-resolved fluorescence and electron spin resonance spectroscopy revealed the catalytic mechanism of the fabricated 2D TiO-CN photocatalysts for CO 2 reduction.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Xiaojun Wen,Yiting Liu,Weilong Zhang,Lijun You,Ning Cai,Jumei Li
In this research, we fabricated an innovative NiO/CN/Ag composite through the straightforward electrostatic assembly of Ag nanoparticles and g-C 3 N 4 sheets onto NiO nanoflowers. This composite enables both surface enhanced Raman spectroscopy (SERS) detection and photo-degradation of pesticides. The results reveal NiO/CN/Ag can quantitatively detect thiram (TRM) and diquat dibromide (DQDB) in water, with a limit of detection (LOD) of 10 −9 M, and also exhibit outstanding photo-degradation efficiency, exceeding 95 % for TRM and DQDB within 90 min under simulated sunlight. Significantly, after the organic reagent (citric acid) on NiO/CN/Ag was completely removed through simulated solar irradiation, the signal-to-noise ratios of SERS spectra on NiO/CN/Ag were enhanced, achieving LODs of 10 −8 M for TRM and DQDB in different fruit juices and dried flower teas. Additionally, the composite demonstrate impressive recyclability, maintaining robust SERS signals and high degradation rates even after five cycles of “detection-degradation” processes.
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FUEL
·
2025
·
IF 7.5
Sheng-Zhe Zhao,Rui-Dong Shi,Guo-Tao Xiang,Yong-Da Hu,Jin-Ju Chen
The system of photocatalytic fuel cells (PFC) emerges as a significant innovation within the realm of energy conversion technologies, harnessing the potential of organic waste to produce electrical energy. In this study, we propose a novel approach for simultaneous electricity production and pollutant removal using a PFC system, which consists of Bi 2 O 3 /TiO 2 heterojunction nanotubes modified by g-C 3 N 4 as photoanode materials. The g-C 3 N 4 /Bi 2 O 3 /TiO 2 (CBT) heterostructure possesses a large specific surface area, improved visible light absorption, and enhanced photogenerated carrier separation capability. The morphology, composition, crystal structure, and optical properties of the synthesized CTB were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and UV–Vis diffuse reflectance spectroscopy (DRS). Using tetracycline hydrochloride as the target pollutant, the photocatalytic degradation performance of the CBT heterostructure is 3.2 times higher than that of pure TiO 2 nanotubes. Furthermore, the PFC system consisting of CBT as photoanode has a significant improvement in pollutant degradation and current output when compared with the PFC with pure TiO 2 . This study presents a cost-effective approach for organic waste treatment and simultaneous electricity production.
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