Journal of Hazardous Materials Advances
·
2021
·
IF 0
Xiao-Yu Zhang,Jing-Jing Wang,Ping Li,Yu-Jia Xiao,Zhao-Yi Tan,Yan-Rong He,Nuzahat Habibul
Herein, Fe 3 O 4 /g-C 3 N 4 composites with different proportions were prepared to remove U(VI) from wastewater through photocatalytic reduction. The morphology, composites, and magnetism of the Fe 3 O 4 /g-C 3 N 4 composites were measured. The characterization results showed that Fe 3 O 4 nanoparticles were well distributed on the surface of g-C 3 N 4 , resulting in the good magnetism and corresponding excellent separation ability of the composites. The U(VI) removal efficiency of the composites with different ratios of Fe 3 O 4 and g-C 3 N 4 was also determined. It was found that Fe 3 O 4 /g-C 3 N 4 with an Fe content of 14% showed the highest U(VI) removal efficiency of 98.7% after 25 min. The photocatalytic reaction rate constant was 0.161 min −1 , which was 2.9 times that of pure g-C 3 N 4 and 2.4 times that of pure Fe 3 O 4 . In addition, after five reaction cycles, the composite showed high photoreduction activity and magnetic properties.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2019
·Vol. 36
·期 2
·236-247
·
IF 2.476
Cui Yanhua,Yang Lili,Meng Minjia,Zhang Qi,Li Binrong,Wu Yilin,Zhang Yunlei,Lang Jihui,Li Chunxiang
A simplified strategy for facilely fabricating antifouling graphite carbon nitride/silver phosphate (g-C 3 N 4 /Ag 3 PO 4 ) nanocomposite photocatalytic polyvinylidene fluoride (PVDF) porous membranes was developed for effective removal of rhodamine B (RhB). g-C 3 N 4 /Ag 3 PO 4 heterojunction was strongly fixed to the interior of the PVDF membranes via phase inversion method. The membrane structure was analyzed by Fourier transform spectrophotometer (FT-IR). The morphology of the prepared membranes was investigated using scanning electron microscopy (SEM), EDX-mapping and atomic force microscopy (AFM), respectively. All prepared nanocomposite photocatalytic PVDF membranes exhibited a typically porous structure, and g-C 3 N 4 /Ag 3 PO 4 nanocomposites were well dispersed inside the membranes. The obtained g-C 3 N 4 /Ag 3 PO 4 heterojunction nanoparticle decorated PVDF membrane had a lower water contact angle of 79° and higher porosity of 85% than that of other two control membranes. The nanocomposite photocatalytic PVDF porous membranes had extremely high permeation flux over 1,083 L·m -2 ·h -1 , and could be used for the removal of RhB. The removal efficiency of g-C 3 N 4 /Ag 3 PO 4 -PVDF membranes towards RhB solution under visible light irradiation reached 97%, higher than that of the pure PVDF membranes (41%) and g-C 3 N 4 -PVDF membranes (85%). Remarkably, the flux performance and flux recovery ratio ( FRR ) of membranes revealed that the g-C 3 N 4 /Ag 3 PO 4 -PVDF membranes could recover high flux after fouling, which presented better fouling resistance. Furthermore, the fabricated antifouling g-C 3 N 4 /Ag 3 PO 4 nanocomposite photocatalytic PVDF porous membranes exhibited excellent recyclability. Therefore, it is expected that g-C 3 N 4 /Ag 3 PO 4 -PVDF membranes could provide an energy-saving strategy for effective removal of organic dyes wastewater and have a great potential for practical wastewater treatment in the future.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Yixiao Wu,Xuesong Zhao,Shaobin Huang,Yihao Li,Xiaoqian Zhang,Gongchang Zeng,Lishan Niu,Yu Ling,Yongqing Zhang
Photocatalytic oxidation using solar energy is a promising green technology to degrade antibiotic contaminants. Herein, a 2D g-C 3 N 4 supported nanoflower-like NaBiO 3 with direct Z-scheme heterojunction was synthesized via a facile hydrothermal approach, and the photocatalytic performance of g-C 3 N 4 /NaBiO 3 was remarkable better than that of g-C 3 N 4 and NaBiO 3 for tetracycline degradation under visible light. Photoinduced electrons accumulated on the conduction band of g-C 3 N 4 and holes gathered on the valence band of NaBiO 3 , which was more suitable for generating superoxide and hydroxyl radicals . Meanwhile, the built-in electric field between g-C 3 N 4 and NaBiO 3 was proved by their different work functions based on DFT calculations , which enhanced the charges separation. The formed radicals were determined by ESR, and their role in the degradation of tetracycline was examined by the active species trapping test. Moreover, the sites attacked by free radicals and degradation pathways for tetracycline were inferred by the results of Gaussian 09 program and HPLC-MS. The effects of water matrix and three other organic contaminants was further studied for actual use evaluation. Importantly, the prepared g-C 3 N 4 /NaBiO 3 showed stable photodegradation activity for eight cycles. This work not only provides a promising photocatalyst, but also gets insight into the photocatalytic removal of tetracycline.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 16
·15267-15276
·
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 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xueming Dang,Shuai Wu,Haiguang Zhang,Xie Quan,Huimin Zhao
A phosphorus (P) doped g-C 3 N 4 needle (PCNN) electrode with great photoelectrochemical (PEC) property is fabricated by a facile solid thermal melting approach. The proposed thermal melting method owns the advantages of low-cost, simple and easy operation, as only the solid mixing of melamine (C and N precursor) and triphenylphosphine oxide (P precursor) is needed in electrode preparation procedure. This method is further conducive to the formation of uniform film with doped heteroatom and unique microstructure on fluorine-doped tin oxide- coated glass (FTO). The PCNN photoelectrode holds a tip structure, which highly inhibits the recombination of photo-generated electron and hole. Particularly, the doped P in PCNN can further accelerate the photo-generated carrier separation and enhance the optical absorption property. As a result, the PCNN photoelectrode displays a five-fold enhancement of photocurrent density over pristine g-C 3 N 4 , reaching up to 127.4 µA cm - 2 at 1.23 V versus reversible hydrogen electrode (RHE), as well as good optical, chemical and physical stability. The PCNN photoelectrode further exhibits great property in PEC removal of pollutant in water. This study provides an effective fabrication method and opens new avenues for the significant improvement of g-C 3 N 4 based electrode in their various energy conversion and environmental application.
研究领域:
材料科学
·
环境科学
·
能源转换
✓ 已验证
DOI
高影响因子
Solar RRL
·
2020
·Vol. 5
·期 3
·2000720
·
IF 7.527
Lian Wang,Lin Fu,Bo Li,Hui Li,Lu Pan,Bohong Chang,Longwei Yin
Despite the conspicuous achievements in perovskite solar cells (PSCs), further improvement of the power conversion efficiency (PCE) is hindered by substantially detrimental carrier recombination resulting from the high interfacial charge defect density and inferior charge transport kinetics. Herein, an interface engineering strategy is developed to introduce a Lewis base thiophene or thiazole–modified C 3 N 4 layer at the electron transfer layer (ETL)/perovskite interface to constitute a stepwise energy band alignment and passivate defects at interfaces of the perovskite film. Attributed to its well-matched energy level with TiO 2 and perovskite, the charge extraction efficiency and charge transfer dynamics can be promoted remarkably, greatly inhibiting charge recombination at the interface. Furthermore, thiophene and thiazole can donate the lone pair electrons in S or N atoms to undercoordinated Pb 2+ , which effectively passivates the electronic trap states caused by halogen vacancies, thereby greatly minimizing trap-assisted nonradiative recombination in the PSCs. Eventually, the thiazole–C 3 N 4 /perovskite-based devices acquire an outstanding efficiency of 19.23%, supported by an enhanced open-circuit voltage ( V OC ) of 1.11 V with improved moisture stability. This work provides an avenue for interfacial energy level modulation and defect passivation strategies for a rational interface microstructure design for meliorating the performance of PSCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Green Energy & Environment
·
2020
·
IF 6.395
Wei Zhang,Jiajun Wang,Zewei Liu,Yibing Pi,Rong Tan
Graphitic carbon nitride ( g -C 3 N 4 ) is a fascinating photocatalyst for solar energy utilization in photo-catalysis. Nevertheless, it often suffers from moderate photo-catalytic activity due to its low specific surface area and fast recombination rate of photogenerated electrons upon photo-excitation. Herein, we overcome the bottlenecks by constructing a porous g -C 3 N 4 nanosheet ( PCNS ) through a simple thermal oxidation etching method. Benefited from its porous layer structure, the obtained PCNS exhibits large specific surface area, efficient separation of photogenerated charge carriers, as well as high exposure of active sites. As a result, it is robust and universal in visible light-driven dehydrogenation of alcohols in water under oxidant-free condition. Almost quantitative yields (> 99%) of various valuable carbonyl compounds were obtained over PCNS , while bulk g -C 3 N 4 was far less efficient. Moreover, the photo-catalyst was highly stable and could be facilely recovered from the aqueous system for efficient reuse. The easy preparation and excellent performance made PCNS a promising and competitive photocatalyst for the solar applications.
研究领域:
材料科学
·
光化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Huanhuan Zhang,Guosheng Han,Yanyan Liu,Lingli Zhao,Wenbo Zhang,Muhammad Tahir Khalil,Huijuan Wei,Chengming Wang,Tao Liu,Xianji Guo,Xianli Wu,Jianchun Jiang,Baojun Li
Designing non-precious catalysts to synergistically achieve a facilitated exposure of abundant active sites is highly desired but remains a significant challenge. Herein, a hetero-structured catalyst CoP-Co supported on porous g-C 3 N 4 nanosheets (CoP-Co/CN-I) was prepared by pyrolysis and P-inducing strategy. The optimal catalyst achieves a turnover frequency ( TOF ) of 26 min −1 at room temperature and the apparent activation energy ( E a ) is 35.5 kJ·mol −1 . The catalytic activity is ranked top among the non-precious metal phosphides or the other supports. Meanwhile, the catalytic activity has no significant decrease even after 5 cycles. The CoP/Co interfaces provide richly exposed active sites, optimize hydrogen/water absorption free energy via electronic coupling, and thus improve the catalytic activity. The experimental results reveal that the CoP/Co heterojunction improves the catalytic activity due to the construction of dual-active sites. This research facilitates the innovative construction of non-noble metal catalysts to meet industrial demand for heterogeneous catalysis .
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 10
·1-13
·
IF 2.8
Li Heng,Chen Limiao,Li Zhongbei,Wang Wengui,Liu Ying,Huang Xuemei,Liu Yaochi
The combination of nitrogen and phosphorus compounds has synergistic flame retardant effect, but the addition of low phosphorus content compounds is large, which affects the mechanical properties of polymers. Phosphorus ammonium polyphosphate (APP) with high phosphorus content and graphitic carbon nitride (g-C 3 N 4 ) doped with SiO 2 were used for the flame retardant (CN-Si-APP) of polyamide 6 (PA6). CN-Si-APPs with different APP/CN mass ratio (1, 2.5 and 4) and dosage (7 and 12 wt%) were blended with PA6 via a twin-screw extruder, and their flame retardancy was investigated by limiting oxygen index (LOI), UL-94 test, muffle furnace carbonization test and raman spectroscopy. When only APP added, the coefficient of water absorption (CWA) of composites increased and its tensile strength greatly reduced by nearly 37.1% to 35.39 MPa. The addition of g-C 3 N 4 inhibited the water absorption. When the addition dosage is 7%, the CWA of PA6/APP, PA6/CN-Si-APP2.5, PA6 and PA6/CN were 11.1, 6.86, 5.78 and 4.6%, respectively. SiO 2 effectively improved the dispersion of g-C 3 N 4 and the mechanical properties of composites. Thermogravimetric analysis (TGA) showed that the char residue of PA6 composites was improved significantly. The composite with 7 wt% CN-Si-APP4 passed the UL-94 V-0 rating. The LOI value and graphitization degree (I D /I G ) of PA6/12 wt% CN-Si-APP2.5 reached 28.7% and 2.93 respectively. Under the same dosage, the graphitization degree of CN-Si-APP2.5 (3.51) was higher than that of g-C 3 N 4 (3.98). The barrier protection of g-C 3 N 4 , catalytic effect of APP and SiO 2 crosslinking network promoted PA6 to form a dense and stable char layer, which protected PA6 composites from the flame. The strategy of synergistic flame retardant in this paper provides a valuable solution for reducing the amount of flame retardant.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 186
·期 1
·1-9
·
IF 5.705
Huang Yanli,Tan Yi,Feng Chuanqi,Wang Shiquan,Wu Huimin,Zhang Guangxue
The preparation of 3 kinds of carbonaceous nanocomposites by hydrothermal treatment and subsequent calcination described. The first comprises a nanomaterial of type CuO/g-C 3 N 4 , with g-C 3 N 4 in mass fractions of 2, 5 and 7 wt%, respectively. The second comprises CuO/porous carbon (5 wt%), and the third comprises CuO/carbon spheres (5 wt%). All of them were employed to modify a glassy carbon electrode (GCE) to obtain electrochemical sensors for glucose and dopamine. The GCE modified with CuO/g-C 3 N 4 (5 wt%) displays the highest electrocatalytic activity towards glucose and dopamine. Figures of merit for sensing glucose (in 0.1 M NaOH solution) include a wide linear range (0.5 μM to 8.5 mM), a detection limit of 0.150 μM, and a sensitivity of 0.274 μA·μM −1 ·cm −2 (at a working potential of 0.60 V vs. Ag/AgCl). The respective data for dopamine (in pH 7.0 solution) are linear ranges from 0.2-16.0 μM and 16.0-78.7 μM, a lower detection limit of 60 nM, and an electrochemical sensitivity of 0.834 and 0.331 μA·μM −1 ·cm −2 (at a working potential of 0.22 V vs. Ag/AgCl). The good performance of the modified GCE is attributed to the synergetic interactions between CuO and the appropriate fraction of g-C 3 N 4 , and the improvement of conductivity.
Schematic presentation of a electrochemical sensor based on CuO/g-C 3 N 4 for the determination of glucose and dopamine.
研究领域:
分析化学
·
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Jianhua Ge,Yujie Liu,Daochuan Jiang,Lei Zhang,Pingwu Du
Photocatalytic H 2 production via water splitting in a noble-metal-free photocatalytic system has attracted much attention in recent years. In this study, noble-metal-free Ni 3 N was used as an active cocatalyst to enhance the activity of g-C 3 N 4 for photocatalytic H 2 production under visible-light irradiation ( λ > 420 nm). The characterization results indicated that Ni 3 N nanoparticles were successfully loaded onto the g-C 3 N 4 , which accelerated the separation and transfer of photogenerated electrons and resulted in enhanced photocatalytic H 2 evolution under visible-light irradiation. The hydrogen evolution rate reached ∼305.4 μmol h −1 g −1 , which is about three times higher than that of pristine g-C 3 N 4 , and the apparent quantum yield (AQY) was ∼0.45% at λ = 420. Furthermore, the Ni 3 N/g-C 3 N 4 photocatalyst showed no obvious decrease in the hydrogen production rate, even after five cycles under visible-light irradiation. Finally, a possible photocatalytic hydrogen evolution mechanism for the Ni 3 N/g-C 3 N 4 system is proposed.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2023
·
IF 3.1
Yujie Jia,Shuhan Jiang,Qianchen Ou,Yanan Liu,Jian Zhang,Yangjie Zhou,Yuan Lian,Hongmei Wang
NiFe-LDH/g-C3N4 (LDH/CN) heterostructures with different amounts of NiFe-LDH (LDH) were prepared by a hydrothermal method and characterized using different experimental techniques. Their photocatalytic properties were investigated using the degradation of tetracycline hydrochloride (TC) and the production of hydrogen from water splitting. Experimental results showed that the hydrogen production rate (780.5 μmol g−1 h−1) was 2.29 times that of pristine CN, and the TC removal rate (76.3%) of 1.8LDH/CN was 3.71 times that of CN. According to the detailed study of the structural, optical, and photoelectrochemical properties, a type II charge transfer mechanism was proposed to explain the improved photocatalytic performance of LDH/CN.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）