OPTICAL MATERIALS
·
2021
·
IF 3.08
Jianhe Tang,Yu Liu,Yitong Lin,Xueke Liu,Liang Chen,Congcong Piao,Dawei Fang,Jun Wang
Photocatalysis technology is an effective way for converting nitrate (NO 3 − ) and sulfite (SO 3 2− ) in wastewater to pollution-free nitrogen (N 2 ) and exploitable ammonium sulfate ((NH 4 ) 2 SO 4 ). In this study, three novel photocatalysts , Z-scheme (Cu,Cu)/g–C 3 N 4 –(Cu,Cu)-WO 3 (002), Z-scheme (Cu,Ag)/g–C 3 N 4 –(Cu,Ag)-WO 3 (002) and Z-scheme (Cu,Ru)/g–C 3 N 4 –(Cu,Ru)-WO 3 (002), were prepared by photo-assisted electrostatic self-assembly method. The prepared photocatalysts are synthetically characterized by XRD , SEM, TEM, EDX , XPS , DRS, PL , TPR and EIS . The effects of different co-catalyst combinations on the activity and selectivity of the photocatalysts are evaluated. Also, the impacts of simulated solar light irradiation time, NO 3 − initial concentration and cycle times on the conversions of NO 3 − and SO 3 2− are studied. The results display that the Z-scheme (Cu,Ag)/g–C 3 N 4 –(Cu,Ag)-WO 3 (002) photocatalyst can selectively convert NO 3 − to N 2 , while the Z-scheme (Cu,Ru)/g–C 3 N 4 –(Cu,Ru)-WO 3 (002) photocatalyst can selectively convert NO 3 − to NH 4 + . Nevertheless, the Z-scheme (Cu,Cu)/g–C 3 N 4 –(Cu,Cu)-WO 3 (002) photocatalyst has hardly selectivity for conversion of NO 3 − . These three photocatalysts all exhibit relatively strong capabilities for converting SO 3 2− to sulfate (SO 4 2− ) due to the existence of the highly active (002) plane of WO 3 . Finally, the possible mechanisms on the photocatalytic conversions of NO 3 − and SO 3 2− caused by Z-scheme (Cu,M)/g–C 3 N 4 –(Cu,M)-WO 3 (002) (M = Cu, Ag and Ru) photocatalysts are proposed.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 6
·8781-8797
·
IF 0
Al-Nayili Abbas,Alhaidry Wissam A.
Herein, novel surface structure LaFeO 3 /nitrogen-deficient g-C 3 N 4 nanocomposites (LaFeO 3 /g-C 3 N 4 -H) have been successfully synthesized by a two-step process. First, nitrogen-deficient graphitic carbon nitride (g-C 3 N 4 -H) was produced by thermally condensing melamine that had been treated with acetic acid as a precursor. After that, LaFeO 3 was incorporated into the g-C 3 N 4 -H nanosheets. The as-prepared nanostructured materials were characterized by XRD, FT-IR, N 2 adsorption–desorption experiments, FESEM, and TEM, demonstrating the formation of interfacial interaction and heterogeneous structure in LaFeO 3 /g-C 3 N 4 -H nanocomposites. Additionally, UV–vis diffuse reflectance spectra (DRS) and photoluminescence spectra (PL) have been used to assess the optical properties of the nanohybrids. The results show that the LaFeO 3 /g-C 3 N 4 -H nanocomposite was successfully produced with a reliable interfacial interface, and produced a good heterojunction relationship between g-C 3 N 4 -H and LaFeO 3 which may significantly boost the photocatalytic activity as compared to prinstine g-C 3 N 4 and LaFeO 3 . Phenol degradation under visible light irradiation was used to test the photocatalytic activity of LaFeO 3 /g-C 3 N 4 -H, and the results showed that 10%-LaFeO 3 /g-C 3 N 4 -H had significant photocatalytic activity and remarkable adsorption efficiency, with an overall removal rate of phenol up to 88% after 180 min of visible light irradiation. This study may present a novel method for developing highly efficient artificial photocatalytic systems.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
催化
·
物理化学
✓ 已验证
DOI
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jianchang Gan,Huihu Wang,Haiping Hu,Ming Su,Feng Chen,Huang Xu
By rationally adjusting the band position of CuInZnS in CuInZnS/g-C 3 N 4 hybrids, we reveal the effects of fine turning the band matching on CO 2 reduction and methyl orange near-infrared degradation. The novel design strategy of CuInZnS/g-C 3 N 4 hybrids, including orderly energy band regulation of CuInZnS and surface carboxylation of g-C 3 N 4 , effectively enhances the light absorption capacity and separation efficiency of photogenerated carriers. In addition, L-cysteine was used as sulfur source for in situ synthesis of hybrids. Using the abundant functional groups of L-cysteine molecules to form bonds and interactions with carboxylated g-C 3 N 4 can effectively improve the dispersion and interface binding of CuInZnS/g-C 3 N 4 hybrids, thus enhancing the transport of carriers at the interface. Benefitting from band matching and interface binding characteristics, the optimized CuInZnS/g-C 3 N 4 hybrids manifest remarkable performance for CO 2 reduction with high CO production rate of 50.04 μmol/g in 8 h and excellent activity for methyl orange near-infrared degradation with 96.5% efficiency in 5 h.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Xiang Xie,Wenhua Xue,Xiaoyun Hu,Hongfei Lv,Jun Fan,Bo Chen,Enzhou Liu
The Cu 2−x Se/g-C 3 N 4 heterojunction was successfully constructed using a one-step method and employed to photocatalytic H 2 evolution from water for the first time. The optimal Cu 2−x Se/g-C 3 N 4 -10 wt% exhibits an efficient H 2 evolution rate of 1954.9 μmol·g −1 ·h −1 , which is nearly 2.2 and 18.6 times higher than that of the pristine Cu 2−x Se and g-C 3 N 4 . This could owe to the improved light capturing ability, abundant active sites, efficient charge carriers’ separation for the appropriate band gap structures between Cu 2−x Se and g-C 3 N 4 . In addition, a photocatalytic H 2 production mechanism over Cu 2−x Se/g-C 3 N 4 heterojunction is analyzed based on the investigation on energy band structures and photoelectric properties of the components.
研究领域:
材料科学
·
光催化
·
能源转换
✓ 已验证
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 53
·33373-33379
·
IF 3.361
Lejie Zhu,Jianmin Luo,Guohui Dong,Yun Lu,Yinlong Lai,Jun Liu,Guanmei Chen,Yi Zhang
As a kind of metal-free organic semiconductor photocatalyst, g-C3N4 has been widely explored for use in photocatalysis. However, the low quantum yield, small absorption range, and poor conductivity limit its large-scale application. Introducing another kind of semiconductor, particularly an oxide semiconductor, can result in some unexpected properties, such as an improved change transfer, enhanced light absorption, and better conductivity. In this work, CuO/g-C3N4 is successfully prepared through an impregnation and post-calcination method. A series of measurements support the formation of an organic-inorganic hybrid p–n heterojunction at the CuO (p-type) and g-C3N4 (n-type) interface. Furthermore, the photoactivity of the composite is evaluated via photocatalytic NO removal and the visible degradation of rhodamine B (RhB). Results show that the photocatalytic properties of CuO/g-C3N4 are almost twice as high as those of g-C3N4. In comparative tests, the photocatalytic degradation performance of Mix-CuO/g-C3N4 (the mixture of CuO and g-C3N4 nanosheets prepared by mechanically mixing) is even lower than that of pure g-C3N4. The degradation of RhB is only 19.7% under visible light after 30 min of irradiation. The improvement in the photoactivity of CuO/g-C3N4 results from the built-in electric field close to the formed p–n heterojunction, which switches the electron transfer mechanism from a double-charge transfer mechanism to a Z-scheme mechanism. In addition, the formed p–n heterojunction favors charge transfer, and thus the photocatalytic performance is significantly improved.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
·
半导体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 4
·1-15
·
IF 2.533
Wang Zhentao,Hasan Jaafar,Wang Jingjing,Zhang Caiwei,Iqbal Waheed,Chang Ninghui,Qin Chuanguang
The treatment of dye-bearing wastes by adsorption using low-cost synthetic adsorbents is urgently needed and challenging because it offers the dual benefit of water treatment and waste management. Herein, the flower-like MoS 2 /g-C 3 N 4 nanocomposites with a size range of 200–400 nm and a specific surface area of 70.656 m2/g were synthesized as new methylene blue (MB) adsorbent materials. Their adsorption mechanisms and influences of pH, adsorbent dosage, concentration, and temperature on the adsorption properties were investigated by batch sorption experiments. Adsorption isotherm data were fitted with the Langmuir model, and the adsorption kinetic characteristics conform to the quasi second-order kinetic equation. According to thermodynamic data, methylene blue (MB) adsorption was endothermic and spontaneous, exhibiting a maximum adsorption capacity of 278.4 mg/g at 45 °C. Additionally, the impact of MB effluent on the germination of chickpea and wheat was studied contrastively with treatment of the tested materials. The results indicated that adequate adsorption of flower-like MoS 2 /g-C 3 N 4 nanocomposite could potentially treat wastewater from the textile industry to be used for irrigation and solve the problem of textile effluent disposal. Graphical abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 11
·16795-16804
·
IF 0
Li Haiyu,Xu Mingze,Zhang Tingsong
The issue of water pollution has emerged as a formidable challenge, prompting a pressing need for solutions. The utilization of metal nanoparticles with surface plasmon resonance and semiconductor composite photocatalysts is regarded as a highly effective approach to solve this problem. g-C 3 N 4 is an effective catalyst for the degradation of organic pollutants. Its photocatalytic performance is usually enhanced by the use of the noble metal Au Ag. However, the high cost of these materials limits their application. In this study, we present the synthesis of Al NPs/g-C 3 N 4 nanocomposites using the bridging effect of ligands. The characterized of transmission electron microscopy (TEM), X-ray diffractometer (XRD) and ultraviolet-visible spectroscopy (UV-Vis) proved that Al NPs/g-C 3 N 4 with a wider light absorption range were successfully synthesized. The effects of ligands, (glutathione (GSH), glutamic acid (GAG), and cysteine (CYS)), Al diameter (40 to 200 nm) and the ratio of Al to g-C 3 N 4 (1:1 to 5:1) on the photocatalytic degradation of methylene blue (MB) by Al NPs/g-C 3 N 4 were also evaluated. The results showed that the optimum degradation efficiency of Al NPs/g-C 3 N 4 for MB at 5 mg/L reached 100% within 60 min, which was 11 times higher than that of pure g-C 3 N 4 . The principal analysis of Al enhancing the photocatalytic performance of g-C 3 N 4 was studied through transient photocurrent spectroscopy (TPC), electrochemical impedance spectroscopy (EIS), and steady-state transient fluorescence spectroscopy (PL). The results confirmed that hot carriers generated by localized surface plasmon resonance (LSPR) of Al nanoparticles increase the carrier concentration. In addition, the Schottky barrier generated by Al and g-C 3 N 4 could also improve the carrier separation rate and increase the carrier lifetime. This work is expected to solve the problem of organic wastewater treatment and lay the foundation for subsequent research on photocatalysis. Graphical abstract
研究领域:
环境科学
·
材料科学
·
纳米技术
·
光催化
·
水处理
✓ 已验证
DOI
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2022
·Vol. 55
·期 43
·434005
·
IF 3.409
Yang Li,Yue Lu,Xiaofang Jia,Zhaoyu Ma,Junying Zhang
Graphitic carbon nitride (g-C3N4) is a photocatalytic semiconductor with great potential for application, whereas, its photocatalytic activity is limited by the high re-combination rate of photo-generated electrons and holes. Here, we load two-dimensional (2D) WO3 nanosheets on the surface of one-dimensional (1D) g-C3N4 porous nanotubes to form a Z-scheme heterojunction. The built-in electric field at the interface of the heterojunction is conducive to promoting electrons transfer from the conduction band of WO3 to the valence band of g-C3N4 and therein combine with the holes. This inhibits electron–hole re-combination in g-C3N4 and WO3, and thus retains the high redox potential of the photo-generated charge-carriers. Therefore, the 2D/1D WO3/g-C3N4 heterojunction shows excellent photocatalytic hydrogen production and Rhodamine B degradation activities. Under simulated sunlight, photocatalytic hydrogen production rate of the WO3/g-C3N4 heterojunction reaches 7.78 mmol g−1 h−1, 2.7 times that of the single g-C3N4 porous nanotubes.
研究领域:
材料科学
·
光催化
·
环境科学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 34
·期 1
·015713
·
IF 3.953
Zheyuan Liu,Lingfang Qiu,Ke Wen,Banpeng Cao,Ping Li,Yi Tang,Xiangshu Chen,Hidetoshi Kita,Shuwang Duo
Photocatalysts with heterojunction structure have been widely used for organic degradation. In this study, CuS/g-C3N4 heterojunction was formed by in situ self-assembly via a simply hydrothermal method. A series of characterizations were applied to analyzing the morphology, structure, optical properties and photo-induced electron transfer of the samples. The effect of CuS mass ratio in the CuS/g-C3N4 composite on methyl blue (10 mg l−1) degradation under visible-light illumination was discussed. When CuS mass ratio was 60%, CuS/g-C3N4 behaved the highest photocatalytic efficiency which is 17 times higher than that of pure g-C3N4, and the optimal heterojunction exhibited promising photocatalytic stability as well. The synthesized CuS/g-C3N4 with intimate contact and promising photocatalytic performance provides important implications on analogous researches on g-C3N4-based heterojunctions for photocatalytic applications.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhixin Liu,Yongdi Liu,Xianbo Sun,Haodong Ji,Wen Liu,Zhengqing Cai
A novel Z-scheme Ag/AgVO 3 /carbon-rich g-C 3 N 4 heterojunction with excellent solar-light-driven photocatalytic activity was constructed via a facile hydrothermal-calcining method. The Ag/AgVO 3 /carbon-rich g-C 3 N 4 composites displayed superior performance for the photocatalytic degradation of sulfamethiadiazole (SFZ) under solar irradiation. The optimal composite with a 10 wt% Ag/AgVO 3 content showed the highest photocatalytic activity, its degradation rate constant ( k ) for SFZ degradation was ∼13 and 30 times than that of carbon-rich g-C 3 N 4 (CCN) and Ag/AgVO 3 , respectively. Furthermore, •O 2 – was identified as the most crucial reactive species in the Z-scheme photocatalysis system. The greatly improved photocatalytic activities are derived from the built-in electric field (BIEF) of CCN and efficient Z-scheme charge transfer with Ag nanoparticles as charge transmission-bridge. The possible photocatalytic degradation mechanism and pathway over Ag/AgVO 3 /carbon-rich g-C 3 N 4 were proposed based on LC-MS analysis and density functional theory (DFT) calculation, and the toxicity of intermediates was evaluated by Quantitative structure–activity relationship (QSAR) based prediction. In summary, this work provides new insight into constructing highly efficient Z-scheme photocatalyst, which is promising for implementation in surface water remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Congyue Zhao,Chunling Li,Minghui Chen,Tianqi Niu,Qian Zhao,Tianjun Ni,Dong Yan,Weidong Wu,Dong Liu
The exploitation of an efficient way to treat antineoplastic doxorubicin hydrochloride (DOX) is critical due to its harmful effects on the ecological system and human health. Recently, photocatalysis has emerged as one of the most feasible strategies to resolve this crisis. However, the development of novel catalysts with highly efficient photocatalytic activity still remains a great challenge. Herein, a novel 0D/3D Nb 2 O 5 QDs/C-doped g-C 3 N 4 type-II heterojunction with outstanding adsorption and photocatalytic degradation capacities for DOX was developed based on combining elemental doping, morphological design and heterojunction fabrication. The C-doping significantly promotes the visible light response and charge migration of g-C 3 N 4 , thus benefiting to the removal of DOX. Meanwhile, the 0D/3D heterogeneous morphology endows the catalysts with abundant active sites, high adsorptive capacity, favourable structural stability, high surface area and enhanced charge migration, which all contribute to the excellent adsorption and photocatalytic performance. The superoxide radicals shown a prominent role in the photocatalytic reaction. In addition, the Toxicity Estimation Software Tool, liquid chromatography-mass spectrometry and density functional theory calculations were also employed to investigate the DOX degradation mechanism, possible pathways and corresponding toxicity of intermediates. This work provides a promising way to develop highly efficient catalysts for the degradation of DOX.
研究领域:
环境科学
·
材料科学
·
毒理学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Jiahui Li,Dongwei Ma,Gui Lu,Dong Fu,Carlos Ponce de León,Jia Hong Pan
Al-ion batteries (AIBs) represent promising multivalent-ion battery alternatives to Li-ion batteries (LIBs). Exploration of cathode materials is the key to improving the electrochemical performance of AIBs. Here we demonstrate a promising AIB cathode candidate based on two-dimensional graphitic carbon nitride (g-C3N4) nanosheets with reversible de/embedding of [AlCl4]− anions in its special layered porous structure during the cyclic charge/discharge process. To address the sluggish ion/charge transportation kinetics that is inherently present in AIBs due to the intrinsically low conductivity of g-C3N4, we optimize different synthetic precursors of g-C3N4 including dicyandiamide, urea, and melamine and, further, develop a facile method for uniformly coating a N-doped carbon (N–C) coating layer on the optimal g-C3N4 derived from dicyandiamide. The resultant AIBs consisting of the g-C3N4@N–C cathode and Al metal anode in the AlCl3/[EMIm]Cl electrolyte exhibit an initial capacity of ∼54.9 mAh·g–1 at 0.2 C with a high Coulomb efficiency ∼99.9%, and they possess long-term cycling over 200 cycles. The underlying charge/discharge process of AIBs, revealed by the ex situ X-ray diffraction and scanning electron microscopy analyses, involves the extraction/insertion of Al species (mainly Al3+, AlCl4–, and Al2Cl7–) into the g-C3N4 crystal lattices with the formation of intermediate Al8C3N4 and (ClCN)3.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）