JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Yi Xiao,Ting Wang,Ganhua Qiu,Kun Zhang,Changguo Xue,Benxia Li
Photocatalytic reactions represent a kind of green and sustainable chemical processes for organic transformations, but the efficiency is limited by the severe recombination and/or inadequate redox potentials of photoinduced charge carriers in photocatalysts . To address these issues, herein, the CdS-EDTA/g-C 3 N 4 heterostructures were designed according to Z-scheme photocatalytic mechanism and synthesized by the hydrothermal growth of CdS on g-C 3 N 4 nanoflakes with assistance of EDTA chelating agent. EDTA played multiple roles in the formation of CdS-EDTA/g-C 3 N 4 heterostructure photocatalysts, such as controlling the morphology of CdS nanostructures , linking CdS and g-C 3 N 4 together, and boosting the charge transfer between two semiconductors. The optimized CdS-EDTA/g-C 3 N 4 (10%) photocatalyst exhibited much higher activities toward the selective reduction of nitrophenol and the selective oxidation of benzyl alcohol , than those of CdS/g-C 3 N 4 heterostructures without EDTA. The enhanced photocatalysis of CdS-EDTA/g-C 3 N 4 can be ascribed to the efficient separation and suitable photoredox potentials of photoexcited charge carriers in the EDTA-bridged Z-scheme system. This work provides the inspiration for exploring inexpensive organic electron mediators for constructing all-solid-state Z-scheme photocatalysts and demonstrates the enhanced performance of Z-scheme photocatalysts for photoredox reactions of organic transformations.
研究领域:
材料科学
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光化学
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DOI
PubMed
高影响因子
RSC Advances
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2015
·Vol. 5
·期 19
·14074-14080
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IF 3.84
Yuangang Li,Xiaoliang Wei,Huajing Li,Rongrong Wang,Juan Feng,Hui Yun,Anning Zhou
Novel nanoarrays composed of inorganic–organic CdS@g-C3N4 core–shell nanorods were fabricated via a simple hydrothermal treatment and heating process. The samples were characterized by XRD, FESEM, TEM, XPS, FTIR, UV-vis and photoelectrochemical (PEC) measurements. We find that both PEC performance and stability against light illumination of the CdS@g-C3N4 CSNRs are significantly enhanced compared with pure CdS NRs. The photocurrent density of the CdS@g-C3N4 CSNRs reaches up to 1.16 mA cm−2, which is 2.5 times higher than that of pure CdS NRs under the same conditions. More importantly, after 3600 s continuous illumination, the CdS@g-C3N4 CSNRs are quite stable and more than 85% of the initial photocurrent is sustained, while the photocurrent of CdS NRs decays to 20% of the initial value. Finally, a possible mechanism for the enhanced PEC performance and stability of the CdS@g-C3N4 CSNRs heterostructure is proposed and discussed systematically based on our experimental results.
研究领域:
材料科学
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能源科学
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化学工程
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
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IF 4.464
Jun-Tao Cao,Jing-Lu Lv,Yu-Xiang Dong,Xiao-Jing Liao,Shu-Wei Ren,Yan-Ming Liu
A general spatial-resolved photoelectrochemical (PEC) sensing platform for sensitive and high-throughput protein analysis was developed by integrating CdS@g-C 3 N 4 heterojunction modified rotatable electrodes array with signal antibodies labeled Cu 2 O (Cu 2 O-Ab 2 ) conjugates. The disk substrate containing eight spatial-resolved working electrodes array was fabricated using acid etching treatment method. After stepwise immobilizing CdS@g-C 3 N 4 , capture antibodies (Ab 1 ), varied concentrations of target protein (prostate-specific antigen) and Cu 2 O-Ab 2 conjugates on the corresponding sensing sites, the immunosensor array was prepared completely. Combining the high photoelectric conversion efficiency of the photoactive material with the effective signal probe, the immunosensor exhibits high sensitivity. The proposed spatial-resolved immunosensing platform shows a working range of 1.0 × 10 -11 – 5.0 × 10 -8 g mL −1 with a detection limit of 5.0 pg mL −1 . The method provides a universal paradigm for near-simultaneously detection of multi-batch samples with good specificity and high sensitivity.
研究领域:
生物化学
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分析化学
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医学诊断
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DOI
高影响因子
OPTICAL MATERIALS
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2022
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IF 3.754
Shirong Kang,Hao Zhang,Mingyu Dou,Gaimei Gao,Hongjie Zhu,Hua Yang,Dacheng Li,Jianmin Dou
The heterojunction structure with CdS@g-C 3 N 4 photocatalyst was obtained via a simple microthermal chemical in-situ deposition method. The catalyst CdS@g-C 3 N 4 (weight ratio of 1:3) maintained excellent degradation activity to 10 ppm tetracycline (TC) after four cycles due to Z-scheme electron transport mechanism, which was demonstrated through several methods, and the photo-corrosion of CdS was inhibited successfully own to this electron transfer paths. Microscope images showed CdS nanoparticles were uniformly distributed on g-C 3 N 4 nanosheets , such surface morphology provided numerous active sites and excellent adsorption performance for photodegradation process. Mechanism study demonstrated the high energy active species including h + , •O 2 − and •OH take part in the degradation process. Through the mass spectrometry analysis , intermediate products and degradation pathway were inferred on TC during photodegradation process. In addition, this study proved the extremely low toxicity of TC aqueous solution after degradation, there was special significance for ecological and environmental protection. This work provided a reference for the design of the Z-scheme photocatalyst and synthesis of catalysts at low temperature (80 °C), and it has application potential in the treatment of water pollution.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Jianfei Li,Bin Zhang,Junyan Lu,Zihao Guo,Mingxia Zhang,Degang Li,Zengdian Zhao,Shasha Song,Yan Liu,Luchang Qin
The path and mechanism of charge transfers in composite catalyst are important for degrading organic pollutants effectively. A quasi-ternary Z-scheme heterojunction photocatalyst with carbon quantum dots (CQD), CdS, and graphitic carbon nitride (g-C 3 N 4 ) (CQD/CdS/g-C 3 N 4 ) has been successfully constructed in this work, and its electron transfer path is elucidated by contrast CdS/CQD/g-C 3 N 4 photocatalyst. The built-in electric field at the interface between CdS and g-C 3 N 4 induces exciton separations. The energy barrier between CQD and CdS accelerated charge transfers and further prevents exciton annihilation. As a result, CQD/CdS/g-C 3 N 4 exhibits the greatest photocatalytic degradation, and the removal rates of Rhodamine B and sulfadiazine are 94.7 % and 76.0 %, which are 2.46 times and 1.47 times of CdS/CQD/g-C 3 N 4 , 7.02 times and 7.92 times of g-C 3 N 4 , respectively. It is further proved that CQD as the active site can promote the generation of H 2 O 2 and effectively inhibit the formation of •O 2 – in the photocatalytic reaction. In addition, the degradation pathway and products of sulfadiazine are explored by means of HPLC-MS and calculation of Gaussian software. This work demonstrates the relationship between photocatalytic activity and electron transfer path, meanwhile, provides a reference for the design of efficient heterogeneous photocatalysts for environmental remediation.
研究领域:
环境科学
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材料科学
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催化化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
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IF 3.582
Li Liu,Panru Hu,Wenquan Cui,Xingang Li,Zisheng Zhang
A novel visible-light-active CdS@g-C 3 N 4 photocatalyst was synthesized via a chemisorption method. This core@shell structure catalyst exhibited enhanced photocatalytic H 2 production activity under visible-light (λ ≥ 420 nm) irradiation. The nano-sheet g-C 3 N 4 was successfully coated on CdS nanoparticles with intimate contact. When the content of g-C 3 N 4 in the hybridized composite is 3 wt. %, the hydrogen-production rate of the CdS@g-C 3 N 4 is 2.5 and 2.2 times faster than pure CdS and bulk g-C 3 N 4 , respectively. Superior stability was also observed in the cyclic runs. The improvement in stability and activity result from the ability of the π-conjugated g-C 3 N 4 material in transporting photo-induced holes. The core@shell structure promoted separation of the photo-generated electron-hole pair and accelerated the emigration speed of the hole from the valence band of CdS. This effect also results in a greatly improved amount of hydrogen production . The possible mechanism for the photocatalytic activity and stability of CdS@g-C 3 N 4 are tentatively proposed.
研究领域:
材料科学
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化学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2024
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IF 8.2
Yadong Yu,Shanshan Wang,Shaopeng Lv,Laiyou Wang,Shuxian Guo
The utilization of solar energy and fast-growing heterotrophic microbes for biofuel production has been recognized as a promising approach to achieve carbon neutrality and address energy crisis. In this work, we synthesized different kinds of photocatalysts based on graphitic carbon nitride (g-C 3 N 4 ). We found that carbon dots modified-graphitic carbon nitride (CDs-g-C 3 N 4 ) showed the highest photocatalytic activity. Subsequently, we developed a photocatalyst-microbe hybrid (PMH) system by combining CDs-g-C 3 N 4 with an oleaginous yeast strain, Cutaneotrichosporon dermatis ZZ-46. Under visible light irradiation, the lipid yield of this PMH system reached 1.70 g/L at 120 h, representing a 36 % increase compared to the control. The photocatalytic reaction-induced ROS and the reductive photogenerated electrons facilitated ZZ-46 cells to synthesize more lipids. Furthermore, the fermentation residual of this PMH system was reutilized to prepare biochar via pyrolysis. The biochar generated at 550 °C (BC-550) demonstrated exceptional adsorption capabilities, particularly with a 57 % adsorption rate for methylene blue (MB), and maintained its perfect adsorption efficacy even after five regeneration cycles. These results offer promising avenues for addressing energy shortages and environmental contamination.
研究领域:
生物技术
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环境科学
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能源科学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2013
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IF 5.008
Jiye Zhang,Yonghao Wang,Jian Jin,Jun Zhang,Zhang Lin,Feng Huang,Jiaguo Yu
CdS/g-C3N4 core/shell nanowires with different g-C3N4 contents were fabricated by a combined solvothermal and chemisorption method and characterized by X-ray powder diffraction, scanning electronic microscopy, transmission electron microscopy, and UV–vis diffuse reflection spectroscopy. The photocatalytic hydrogen-production activities of these samples were evaluated using Na2S and Na2SO3 as sacrificial reagents in water under visible-light illumination (λ ≥ 420 nm). The results show that after a spontaneous adsorption process g-C3N4 is successfully coated on CdS nanowires with intimate contact and can significantly improve the photocatalytic hydrogen-production rate of CdS nanowires, which reaches an optimal value of up to 4152 μmol h–1 g–1 at the g-C3N4 content of 2 wt %. More importantly, g-C3N4 coating can substantially reinforce the photostability of CdS nanowires even in a nonsacrificial system. The synergic effect between g-C3N4 and CdS, which can effectively accelerate the charge separation and transfer corrosive holes from CdS to robust C3N4, was proposed to be responsible for the enhancement of the photocatalytic activity and photostability. The possible conditions necessary for the synergic effect to work in a CdS/g-C3N4 core/shell configuration is also discussed.
研究领域:
材料科学
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光催化
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可再生能源
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纳米技术
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氢气制备
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DOI
高影响因子
Catalysts
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2022
·Vol. 12
·期 7
·774
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IF 4.501
Wei Qian,Wangtong Hu,Zhifei Jiang,Yongyi Wu,Zihuan Li,Zenghui Diao,Mingyu Li
In recent years, with the large-scale use of antibiotics, the pollution of antibiotics in the environment has become increasingly serious and has attracted widespread attention. In this study, a novel CDs/g-C3N4/BiPO4(CDBPC) composite was successfully synthesized by a hydrothermal method for the removal of the antibiotic tetracycline hydrochloride (TC) in water. The experimental results showed that the synthesized photocatalyst was crystalline rods and cotton balls, accompanied by overlapping layered nanosheet structures, and the specific surface area was as high as 518.50 m2/g. This photocatalyst contains g-C3N4and bismuth phosphate (BiPO4) phases, as well as abundant surface functional groups such as C=N, C-O, and P-O. When the optimal conditions were pH 4, CDBPC dosage of 1 g/L, and TC concentration of 10 mg/L, the degradation rate of TC reached 75.50%. Active species capture experiments showed that the main active species in this photocatalytic system were holes (h+), hydroxyl radicals, and superoxide anion radicals. The reaction mechanism for the removal of TC by CDBPC was also proposed. The removal of TC was mainly achieved by the synergy between the adsorption of CDBPC and the oxidation of both holes and hydroxyl radicals. In this system, TC was adsorbed on the surface of CDBPC, and then the adsorbed TC was degraded into small molecular products by an attack with holes and hydroxyl radicals and finally mineralized into carbon dioxide and water. This study indicated that this novel photocatalyst CDBPC has a huge potential for antibiotic removal, which provides a new strategy for antibiotic treatment of wastewater.Keywords:carbon dots;photocatalysis;graphitic carbon nitride;bismuth phosphate;tetracycline hydrochloride
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CHEMOSPHERE
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2022
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IF 8.943
Chong Liang,Mingyu Cui,Wei Zhao,Linyang Dong,Shangshang Ma,Xutang Liu,Dingkai Wang,Zhijie Jiang,Fei Wang
Photocatalytic technology has been considered as a promising method to alleviate environmental pollution owing to the dual characteristics of redox. The novel V-based H 5 PMo 10 V 2 O 40 (HPA-2) photocatalyst with Z-scheme heterostructure was constructed. The energy level of HPA-2 matches well with CdS and g-C 3 N 4 (CN) according to Mott-Schottky and UV–Vis diffused reflectance tests, which allows the efficient separation of photogenerated electrons. The optimized CdS/HPA-2/CN showed superior ability in Rhodamine B (RhB) degradation and reduction of Cr (Ⅵ) under visible light irradiation. The maximum rate constant reached 0.092 min −1 for RhB degradation at 60 min and 0.260 min −1 for Cr (Ⅵ) reduction at 20 min, respectively. The photocatalytic mechanism was analyzed by adding scavengers. The effect of active species for RhB degradation was determined as h + > ·O 2 − > ·OH, while ·O 2 − and e − were essential for the reduction of Cr (Ⅵ). Besides, cyclic tests exhibit excellent repeatability and stable structure of CdS/HPA-2/CN after four cycles. Meanwhile, the detailed degradation process of RhB involving de-ethylation, hydroxylation, substitution and decarboxylation was determined according to LC-MS and evaluated by Fukui function calculation. Furthermore, total organic carbon content decreased to 6.2% of the initial value. In this work, as an electron mediator, HPA-2 provides the inspiration for construction of Z-scheme heterojunction , and CdS/HPA-2/CN exhibits enormous potential in the environmental remediation by photocatalysis .
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121659
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IF 7.5
Xinrui Lv,Huinan Sun,Zhijia Wu,Wei Gao,Mingshu Bi,Yufeng Wu
The study employed a synergistic surface-band engineering strategy to prepare a novel g-C 3 N 4 -based photocatalyst for the efficient and safe degradation of nitrobenzene (NB), a typical recalcitrant pollutant. Fe 0.010 /LCDs-TCN exhibited a higher density of active sites, a broader visible light absorption range, and a more effective separation and transfer of charge carriers. Importantly, Fe 0.010 /LCDs-TCN displayed a bandgap of 2.59 eV, with a valence band of + 2.04 eV and a conduction band of −0.55 eV. This narrowed bandgap, along with an optimized band potential, enabled the simultaneous generation of crucial active species ·OH and ·O₂⁻ from water and O₂. This mechanism skillfully balanced visible light absorption and redox capability. Regarding degradation performance, degradation rates reached up to 93 % for NB within 4 h, and 98 % for nitrophenols within only 60 min. Moreover, this system exhibited strong stability against pH variations and coexisting ions. The 5 cyclic experiments achieved high degradation efficiency of 74.3–94.7 %. The QSAR-based ECOSAR and Toxicity Estimation Software Tool (T.E.S.T.) confirmed a significant reduction in acute and chronic toxicity and mutagenicity of NB degradation system. This work offers a novel perspective on regulating g-C 3 N 4 by balancing light absorption and redox capability, providing a promising strategy for safe, efficient, and sustainable water purification technologies.
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高影响因子
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