Journal of Environmental Chemical Engineering
·
2017
·
IF 0
Jun Liu,Qingyong Tian,Zhaohui Wu,Weijing Yao,Xiangheng Xiao,Wei Wu
Trinary g-C 3 N 4 /Ag/Ag 3 PO 4 heterostructures with different Ag content were designed and synthesized by in situ deposition and reduction routes. The photocatalytic performances of these heterostructures were investigated under visible light (λ > 450 nm) and simulated sunlight. Moreover, the influence of Ag content and ratio of each component on the photocatalytic performance of g-C 3 N 4 /Ag/Ag 3 PO 4 was also studied. As a result, the photocatalytic activities of all these g-C 3 N 4 /Ag/Ag 3 PO 4 samples were higher than commercial P25 (TiO 2 ). Moreover, sample S1 (the ratio of g-C 3 N 4 , Ag 3 PO 4 and Ag is 1: 2.52: 0.12) showed the better photocatalytic activities than other g-C 3 N 4 /Ag/Ag 3 PO 4 samples (S2 and S3) and g-C 3 N 4 /Ag 3 PO 4 (1: 3) under the same light irradiation. It indicated that small amount of Ag nanoparticles could improve the photocatalytic performances by compared with g-C 3 N 4 /Ag 3 PO 4 sample. And S1 showed a stable photodegradation after 6 times of cycle experiments under simulated sunlight. The stable and significant superior photocatalytic performance of g-C 3 N 4 /Ag/Ag 3 PO 4 could be attributed to the fast charge separation among g-C 3 N 4 , Ag and Ag 3 PO 4 during the Z -scheme charge transfer and recombination process.
研究领域:
材料科学
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环境科学
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DOI
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.
研究领域:
材料科学
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环境科学
·
化学工程
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纳米技术
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 10
·1-11
·
IF 5.3
Cheng Yan,Wang Yunzhi,Zhang Pengcheng,Hu Xing,Hou Xiaolin,Zhang Bing
Enzyme-mimicking nanomaterials have gained significant attention for use in colorimetric immunoassays. However, further enhancing their mimetic enzyme activity remains crucial for improving assay sensitivity. In this study, CeO 2 /g-C 3 N 4 nanozymes were synthesized with enhanced catalytic activity when exposed to visible light. The irradiation facilitates electron transfer within the CeO 2 /g-C 3 N 4 nanomaterials, leading to the generation of reactive oxygen species (ROS). These ROS then promote the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB), causing a distinct color change. Based on this, a novel colorimetric immunoassay platform was developed, using the CeO 2 /g-C 3 N 4 nanomaterials as labels. Under visible light, the color development signal was significant amplified, resulting in improved sensitivity. This approach showed a linear response for the detection of carcinoembryonic antigen (CEA) in the range 0.5–30 ng/mL, with a limit of detection (LOD) of 0.13 ng/mL. The assay also demonstrated high specificity and excellent reproducibility. Consequently, this method offers a promising strategy for early cancer diagnosis and holds considerable potential for wider clinical applications. Graphical
研究领域:
肿瘤学
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免疫学
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纳米医学
·
分子诊断
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转化医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Jiaqi Zhang,Jin Li,Xiangyu Liu
The degradation of organic dyes and other pollutants has always been one of the great challenges facing mankind today. So our work designed and improved a novel composite, by using zinc oxide (ZnO) nanoparticles to modify porous carbon nitride (g-C 3 N 4 ), and then load graphene oxide (Go) nanosheets . These prepared binary and ternary composites with different weight ratios were subjected to a series of tests. The results showed that when the weight ratio of g-C 3 N 4 was 40%, the binary composite ZnO-g-C 3 N 4 transferred its absorption edge to lower energy and had the best photocatalytic performance. Moreover, the addition of Go immensely cut down the recombination of photo-generated carriers and enhanced the absorption in the visible light range. The ZnO-g-C 3 N 4 (40%)-Go (15%) displayed 98% degradation efficiency in 100 min, the rate was about 2.23 times than ZnO-g-C 3 N 4 (40%). XRD , XPS, TEM proved the successful hybridization of the composite, and PL explained the causes for the amendment of photocatalytic efficiency. The conduction band and valence band potential of the material were calculated by VB-XPS, and combined with the free radical capture experiment proved the most effective free radical in this experiment and proved the reaction mechanism of the photocatalytic reaction. Through the photocurrent and EIS the results analyzed the high responsivity of the material and the low photogenerated e − /h + recombination rate. In brief, the interface effect and synergistic effect of the ternary heterojunction greatly enhanced the photocatalytic degradation of toxic dyes.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Jiayi Wang,Penggang Ren,Ying Zhang,Zihang Cai,Zhengyan Chen,Yanling Jin,Zhengzheng Guo
BiOI is a promising photocatalyst due to its exceptional visible light response and high absorption coefficient; however, its performance is hindered by the rapid recombination of electron-hole (e − -h + ) pairs. Herein, a 2D/3D BiOI/g-C 3 N 4 S-scheme heterojunction catalyst was designed and constructed through the alkali etching strategy and subsequent microwave-assisted hydrothermal strategy. The abundant surface active sites and matched band gap of g-C 3 N 4 prepared through alkali etching facilitates anchoring of BiOI nanosheets, contact with contaminants and construction of heterojunctions. 2D/3D S-scheme heterojunction substantially promote electron-hole (e − -h + ) pairs separation and transfer. Profited from their synergistic effects, the 2D/3D BiOI/g-C 3 N 4 heterojunction delivers superior photocatalytic activity toward four different types of pollutants: methylene blue (91.7 %), tetracycline (91.9 %), eosin y (90.9 %) and methyl orange (97.7 %), and demonstrates excellent cyclic stability after seven methylene blue cyclic degradation experiments. Furthermore, BiOI/g-C 3 N 4 has shown satisfactory practicability in many simulation experiments, such as coexisting cations, different pH and real water. A feasible strategy to prepare a visible-light-driven multidimensional coordinated S-scheme heterojunction photocatalyst is provided in this work.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 125
·期 2
·1179-1190
·
IF 1.515
Mao Yong,Wu Mingzai,Li Guang,Dai Peng,Yu Xinxin,Bai Zhiman,Chen Peng
For highly efficient photodegradation of organic pollutants, the enhancement of photocatalytic activity of metal-free photocatalyst graphitic carbon nitride (g-C 3 N 4 ) under visible light irradiation is meaningful, but still challenging due to the fast recombination of photogenerated electron–hole pairs, low quantum efficiency and specific surface area of pristine g-C 3 N 4 . To address these challenges, boron-doped g-C 3 N 4 together with nitrogen-vacancies (Bd-Nv-C 3 N 4 ) was designed and synthesized through a simple acid-assisted calcination of melamine without any further tedious operations. As expected, based on the synergistic effect of foreign elements doping (boron atoms doping) and intrinsic defects (nitrogen vacancies), the as-prepared novel Bd-Nv-C 3 N 4 photocatalyst shows lower band gap, higher surface area and separation efficiency of photogenerated electron–hole pairs, achieving a nearly tenfold increase of the phtocatalytic constant for methylene blue (MB) degradation compared to that of pristine g-C 3 N 4 without nitrogen-vacancies and boron-doping. This study provides a new train of thought and method for the design and preparation of nonmetal photocatalysts with enhanced visible light irradiation photocatalytic performance.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Ruxue Ma,Han Zheng,Jing Wang,Xiucheng Zheng,Xiaoli Zhang,Xinxin Guan
Photocatalytic degradation is an effective and challenging strategy in purifying wastewaters containing organic pollutants. Thus, developing a suitable photocatalyst and clarifying the degradation mechanism are extremely worthwhile. In this work, Zn 2+ -decorated porous g-C 3 N 4 with nitrogen vacancies (g-C 3 N 4-δ ) is prepared with the facile sonication-calcination method. Benefitting from the modified geometric structure and electronic properties, compared with g-C 3 N 4-δ , the resulting composites deliver reduced micropore percentage, enhanced separation and migration of photogenerated carriers, narrowed band gap, and improved reducing capacity of photoinduced electrons, favoring the photocatalytic reaction. Particularly, Zn 2+ (2)-g-C 3 N 4-δ (10 mg) displays the highest photocatalytic activity toward eliminating tetracycline (TC, 10 mg L -1 , 50 mL), and the degradation efficiency (63.9%) within 30 min is 3.4 times that of g-C 3 N 4-δ (18.9%) irradiated by visible light. Moreover, the optimal composite demonstrates satisfactory recyclability and excellent universality. This study suggests a novel way to construct g-C 3 N 4 -based photocatalysts for efficiently degrading organic contaminants in water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 2
·1-13
·
IF 2.8
Wu Canfeng,Chen Yanrong,Yao Yingbang
Graphitic carbon nitride (g-C 3 N 4 ) has been widely studied and applied in the field of catalysis, but its photocatalytic performance still needs to be improved. In this work, g-C 3 N 4 was protonated with hydrochloric acid and nitric acid, and the products were denoted as HCN and NCN, respectively. The photocatalytic performances of g-C 3 N 4 , HCN, and NCN were compared by the degradation of Rhodamine B solution (RhB) under visible light. The structure, morphology, optical, and electrochemical properties of the samples were systematically characterized. It was found that both HCN and NCN were composed of uniform nanosheets, and HCN had a better separation. The UV–Vis and PL spectra showed that the band gap of the material was widened, and the photogenerated electron-hole pairs can be effectively separated. From the photocatalytic degradation test, HCN and NCN showed stronger photocatalytic activity than g-C 3 N 4 , and the degradation efficiency was HCN > NCN > g-C 3 N 4 , the degradation of RhB were 98%, 95%, and 78% respectively at 75 min. The experiment of the free radical scrubber showed that superoxide free radical was the main active substance of photocatalytic degradation. Our results have potential application value for the design of two-dimensional photocatalytic materials.
研究领域:
催化
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材料科学
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光催化
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环境科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Haitao Li,Ming Wang,Yiping Wei,Fei Long
A series of noble-metal-free NiS 2 -loaded g-C 3 N 4 hybrid composites were prepared via simple hydrothermal method. Benefited from the wider spectral response range and the effective separation of photoelectron-holes of g-C 3 N 4 -NiS 2 heterojunction catalysts, as well as the rich unsaturated active S atoms on the NiS 2 with S 2 2− , the composite catalysts has prominent photocatalytic performance for H 2 evolution. Remarkably, the optimal composite photocatalysts achieved an average hydrogen production rate as high as 715.83 μmol/h/g in 3 h under visible-light irradiation, which is 2.75 times as high as that of precious metal Pt (259.5 μmol/h/g) as a co-catalyst. Besides, the composite catalyst still shows prominent photocatalytic performance for H 2 evolution after three continuous photocatalytic reaction cycles for 9 h. This study provided a facile method to build a low-cost but effective metal sulfide co-catalyst for hydrogen production under visible light irradiation.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Runyu Zhou,Yongsheng Fu,Gaofeng Zhou,Shixiang Wang,Yiqing Liu
In this study, a novel Fe/Co bimetallic spinel sulfide (FeCo 2 S 4 ) modified g-C 3 N 4 composite (FeCo 2 S 4 -CN) was prepared by a hydrothermal method and firstly applied as a catalyst for the activation of peracetic acid (PAA) at neutral pH. The efficient rhodamine B (RhB) degradation in FeCo 2 S 4 -CN/PAA system indicated that PAA was successfully activated by FeCo 2 S 4 -CN. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) results indicated that g-C 3 N 4 carrier could anchor FeCo 2 S 4 particles with good dispersion. The X-ray photoelectron spectroscopy (XPS) analysis suggested that the surface ≡Co(II) and ≡Fe(II) could activate PAA to form CH 3 C(O)O • and • OH, synchronously yielding ≡Co(III) and ≡Fe(III). Meanwhile, the surface ≡Co(III) and ≡Fe(III) could also react with PAA to generate CH 3 C(O)OO • as well as ≡Co(II) and ≡Fe(II), resulting in the redox cycles of ≡Co(II)/≡Co(III) and ≡Fe(II)/≡Fe(III). Besides, the presence of S 2- in FeCo 2 S 4 -CN was favorable to these redox cycles. Radical scavenging experiments confirmed that organic radicals (i.e., CH 3 C(O)O • and CH 3 C(O)OO • ) were the primary reactive species for RhB degradation in FeCo 2 S 4 -CN/PAA system. This system also exhibited a high removal efficiency for various organic contaminants, suggesting its potential application in degrading refractory pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Suci Meng,Pengfei An,Lijie Chen,Shichao Sun,Zhongkai Xie,Min Chen,Deli Jiang
Developing high-efficient and low-cost photocatalysts is of great significance yet challenging for photocatalytic hydrogen evolution. Herein, we report a 2D/2D Ru-modulated CoP nanosheets (Ru-CoP -x , where x refers the Ru-to-Co molar ratio)/g-C 3 N 4 nanosheets (GCN NSs) ternary hybrid as a photocatalyst for hydrogen evolution under visible light. The optimal photocatalyst 25% Ru-CoP-1:8/GCN NSs exhibits an excellent hydrogen evolution rate of 1172.5 µmol g −1 h −1 under visible light with a high apparent quantum efficiency (AQE) of 3.49% at 420 nm, which is close to Pt/g-C 3 N 4 photocatalytic system and higher than most reported transition metal phosphides (TMP)/g-C 3 N 4 photocatalytic system. Experimental results indicate that the higher photocatalytic hydrogen evolution performance can be mainly attributed to the binary Ru-CoP -x co-catalyst with efficient charge separation and promoted surface water reduction kinetics, and the 2D/2D self-assembly structure with strong interface Schottky effect and short charge transport distance. This study provides a new approach to develop cost-effective Pt-alternative co-catalysts for photocatalytic hydrogen evolution by incorporating a small amount of ruthenium into the transition metal phosphides.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 30
·2201330
·
IF 6.389
Yaping Wang,Meiyang Liu,Yi Zhang,Qingfeng Yi,Ruowei Yi
Herein, a combined method for planetary ball milling and pyrolysis of g-C 3 N 4 /cobalt phthalocyanine mixture to synthesize Co nanoparticles loaded on C N nanosheets ( g -C 3 N 4 @CoPc- x with different mass ratios x of g-C 3 N 4 :CoPc) is proposed. The synthesized catalysts exhibit a unique 3D open sheet-like structure, and the average size of Co particles is 4.45 nm while encouragingly, a small amount of quasi single-atom cobalt (mean particle size 0.5 nm) is also found in the samples. In addition, the mass ratio of g-C 3 N 4 to CoPc presents a significant effect on ORR activity of the samples. Among the samples, g-C 3 N 4 @CoPc-3 shows excellent ORR performance with the onset potential of 0.94 V in neutral condition and the half-wave potential of 1.00 V in alkaline condition, both better than Pt/C. Its onset potentials in acidic (0.83 V) and alkaline (1.07 V) conditions are also comparable to Pt/C. In a full pH range (acidic, alkaline, and neutral) electrolyte, the prepared samples catalyze ORR via a direct four-electron reaction pathway, and the C 3 N 4 @CoPc-3 reveals high catalytic stability and high anti-alcohol tolerance. Results provide wide feasibility for the synthesis and application of g-C 3 N 4 @CoPc-3 in fuel cells.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
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