INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Kai Wang,Nini Zhao,Haiyan Xie,Jingzhi Wang,Wenli Xu,Zhiliang Jin
Improving the separation efficiency of semiconductor photogenerated carriers is an important way to enhance the photocatalytic activity of water splitting. To establish an efficient photocatalytic hydrogen production system, a practical method combining metal-like cocatalysts with semiconductors was designed. This article prepared Ni-CdS by modifying Prussian blue analogues and synthesized Ni-CdS/1T-WS 2 composite materials by low-temperature mixing with metal-like catalyst 1T-WS 2 . At the optimal load concentration, it can reach 62.65 mmol g -1 . Firstly, the close contact interface formed between the two enables rapid transfer of photo generated electrons . Secondly, metal-like cocatalysts have a strong attraction to the charges generated by light, forcing electron hole separation and exacerbating this effect under illumination. This has been strongly demonstrated through a series of characterizations and in-situ radiation X-ray photoelectron spectroscopy. In summary, this study provides a reliable and clear understanding for the modification of Prussian blue analogues and the regulation of photo induced charge transfer by metal-like cocatalysts.
研究领域:
材料科学
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物理化学
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能源催化
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半导体光催化
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纳米材料
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
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IF 6.1
Junshuai Zhang,Cui Du,Chen Zhou,Shengyang Yang
The production of hydrogen and benzaldehyde (BAD) by splitting benzyl alcohol (BA) through photocatalysts is one of the common methods of converting solar energy to chemical energy. Herein, a photocatalyst to achieve high efficiency in hydrogen production was fabricated by loading Cu-Ni bi-metal on the CdS nanorods as a carrier. The 20% Cu 1 Ni 1 /CdS composite catalyst was used for simultaneous photocatalyze H 2 production and BA oxidation to BAD under light with activities of 14.517 and 13.220 mmol g -1 h −1 , respectively, which is 8.7 times and 7.9 times higher than that of pure CdS . The high production efficiency can be mainly attributed to the synergistic effect of Cu-Ni bi-metal and the close contact between Cu-Ni and CdS interfaces. These microstructures enhance light absorption, effectively promote charge separation, and reduce the complexation of photogenerated electrons and holes. This work provides new ideas for the design of a cost-effective catalyst.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Wenxue Gong,Xuechun Wei,Yanhu Han,Sidra Subhan,Xin Yu,Tianjian Ji,Wenqing Sun,Yuming Zhang,Zhongfeng Shi,Zhenxia Zhao,Zhongxing Zhao
Herein, ZnO based materials are modified to narrow the photonic band gap, improved utilization rate of visible light and recombination efficiency of photoexcited carriers for the photocatalytic degradation of tetracycline hydrochloride (TCH). For this purpose, a photonic crystal (PC) heterojunction was constructed comprising of nitrogen (N) doped cadmium sulfide (CdS) coupled with ZnO (CdS-N/ZnO) via sacrificial template and multilayer in-situ deposition methods. The constructed PC junction acted as photocatalyst for the effective degradation of TCH under visible light by synergistically promoting the separation efficiency of electron-hole pairs, narrowing the band gap and broadening the light absorption spectrum of ZnO. Moreover, a slow light effect was achieved by adjusting the band gap of the PC overlapped with the wavelength of incident light, which finally enhanced the light harvesting performance of the CdS-N/ZnO photocatalyst. The optimized PC CdS-N/ZnO composites exhibited efficient TCH removal rate of 97.0 % in 90 min and kb as 4.00–15.17 times that of other reported catalysts. Moreover, PC CdS-N/ZnO catalyst achieved 45.2 % mineralization rates reached in 120 min with high stability and reusability for six cycles. HPLC-MS method was used for monitoring the intermediates of TCH degradation, and also analyzing the possible pathways of products. In addition, the toxicity of TCH and its intermediates were also investigated, which showed that the toxicity has effectively been alleviated. The photocatalytic mechanism endowed that ·O 2 – and h + are the major active free radicals in the photocatalytic degradation process, and the electron transport path is type Ⅱ heterostructure. This work will thus envisage a novel vision of designing ZnO photocatalysts for the antibiotic degradation in the practical application of wastewater treatment.
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Biosensors-Basel
·
2023
·Vol. 13
·期 2
·222
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IF 5.4
Yangjie Li,Site Luo,Xin Wang,Yang He,Haihu Yu
A ratiometric fluorescence probe based on the conjugation of peroxyfluor-NHS (PF) and carbon dots (CDs) was designed for selective and rapid detection of glucose. When glucose was catalytically oxidized by glucose oxidase (GOx), the product H2O2would react with colorless and non-fluorescent peroxyfluor moiety to give the colored and fluorescent fluorescein moiety which would absorb the energy of CDs emission at 450 nm due to the Förster Resonance Energy Transfer (FRET) and generate a new emission peak at 517 nm. The reaction between PF and H2O2was slow with a rate constant of about 2.7 × 10−4s−1under pseudo-first-order conditions (1 uM PF, 1 mM H2O2), which was unconducive to rapid detection. Given this, a short time detection method was proposed by studying the kinetics of the reaction between PF and H2O2. In this method, the detection time was fixed at three minutes. The linear detection of glucose could be well realized even if the reaction was partially done. As glucose concentration increased from 0.05 mM to 5 mM, the fluorescence intensity ratio (I517/I450) after 3 minutes’ reaction of CDs-PF and glucose oxidation products changed linearly from 0.269 to 1.127 with the limit of detection (LOD) of 17.19 μM. In addition, the applicability of the probe in blood glucose detection was verified.Keywords:carbon dots;ratiometric fluorescence;glucose;rapid detection;fluorescein;kinetics
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MICROCHEMICAL JOURNAL
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2023
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IF 4.8
Jia Liu,Bin Yang,Yuting Wang,Fengming Zhang,Xin Liu,Shiyue Niu,Yue Yuan,Shuyun Bi
Cadmium sulfide quantum dots (CdS QDs) were synthesized with 3-mercaptopropionic acid (MPA) as protective agent, which were characterized by TEM, UV–vis, fluorescence, XRD and TGA. Based on the fluorescence quenching of 3-MPA-CdS QDs, the indirect methods for the determination of furazolidone (FZD) and nitrofurantoin (NFT) were established. The interaction between FZD/NFT and CdS QDs was investigated by using fluorescence, resonance light scattering, UV–vis and FT-IR. The analyses of Stern-Volmer and fluorescence lifetime indicated that the two quenching systems were all static. The binding constant ( K a ) of FZD/NFT-CdS QDs was 1.20 × 10 4 /1.81 × 10 4 L/mol at 293 K, respectively. Hydrogen bond or van der Waals force was the main binding force between CdS QDs and drugs. Under optimum experimental conditions, the concentration of FZD/NFT was respectively highly correlated with the fluorescence intensity ratio in the range of 0.27 – 36.03/0.57 – 28.58 μg mL −1 . The interference experiments showed that the methods had good selectivity. The limit of detection (LOD) for FZD/NFT was 0.02/0.01 μg mL −1 . The contents of FZD and NFT in fish samples were determined, and the recoveries were 97.41–99.52 % and 96.64–100.49 %, respectively.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Taiguang Li,Mingyong Wang,Yongmei Hao
A novel magnetic core-shell Fe 3 O 4 @SiO 2 @CdS embedded graphene oxide (GO) composite was prepared for the visible-light-driven photodegradation of high ring number polycyclic aromatic hydrocarbons (PAHs). The potential application of GO-Fe 3 O 4 @SiO 2 @CdS was evaluated through the photodegradation of phenanthrene and pyrene in deionized water, tap water , and lake water, respectively. It was found that GO-Fe 3 O 4 @SiO 2 @CdS could remove 86.4 % of phenanthrene and 93.4 % of pyrene, suggesting its potential for the degradation of high-ring number PAHs. The density functional theory (DFT) calculations demonstrate that pyrene has more active sites attacked by free radicals. The photoelectrochemical measurement and quenching experiments indicate that GO can transfer photoelectrons efficiently, resulting in the crucial radicals ( O 2 − , OH and 1 O 2 ). More importantly, the photocatalytic activity kept almost constant during five cycles, confirming the significant anti-photocorrosion of GO-Fe 3 O 4 @SiO 2 @CdS. This work provides some new insights into the removal of PAHs with high-ring numbers in the natural water environment.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Dongyun Liao,Guifang Liang,Yuyao Liu,Wenjun Yan,Yujing Guo,Wenting Liang,Chuan Dong,Lifang Fan
In this work, an efficient and novel photoelectrochemical (PEC) aptasensor for 2,3′,5,5′-tetrachlorobiphenyl (PCB72) was constructed based on [email protected] [email protected] quantum dots ( [email protected] QDs)-decorated TiO 2 nanotubes (TiO 2 NTs). [email protected] QDs were prepared by the combination of CdTe and CdS with a proper lattice mismatch. Due to their large band offsets, [email protected] QDs can reduce undesirable carrier recombination, significantly improving their charge separation efficiency. Then the synthesized [email protected] QDs were modified on TiO 2 NTs ( [email protected] QDs/TiO 2 NTs) through electrostatic adsorption method. The as-prepared composites exhibit a wide visible light absorption range, good PEC activity and high photoelectric conversion efficiency. Also, the PEC aptasensor prepared via the immobilization of anti-PCB72 aptamer on the composites exhibits outstanding analytical performance with high sensitivity and specificity for PCB72 under visible-light irradiation, achieving a detection limit as low as 0.03 ng/L. It was also applied to detect PCB72 in four different real environmental samples with satisfactory results.
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RSC Advances
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2022
·Vol. 12
·期 50
·32480-32487
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IF 4.036
Jingzhe Li,Yue Chen,Liezhen Zhu,Linfa Liao,Xinmao Wang,Xun Xu,Lingfang Qiu,Jiangbo Xi,Ping Li,Shuwang Duo
In this study, a novel g-C3N4-based ternary heterojunction was rationally designed and constructed by the in situ growth of ZnIn2S4 nanosheets and CdS nanoparticles onto the g-C3N4 nanosheets using a facile two-step oil-bath method. Through optimizing the proportion of ZnIn2S4 and CdS component, g-C3N4 nanosheets coupled with ZnIn2S4 nanosheets and CdS nanoparticles (denoted as CdS/ZnIn2S4/g-C3N4) exhibited obviously higher photocatalytic properties for RhB removal than the single-component and dual-component systems. Among the as-obtained ternary photocatalysts, it was found that the ternary CdS/ZnIn2S4/g-C3N4-0.2 photocatalyst displayed the optimum photocatalytic property (96%) within a short time (30 min), which was almost 27.42 and 1.17 times higher than that of pure g-C3N4 and binary ZnIn2S4/g-C3N4-0.7 composite. The excellent activity of the ternary CdS/ZnIn2S4/g-C3N4 heterostructure is assigned to the synergetic effects of CdS nanoparticles, ZnIn2S4 nanosheets and g-C3N4 nanosheets, which not only broaden the visible-light absorption range, but also improve the charge mobility and separation rate, thus boosting the visible-light-driven photocatalytic property of g-C3N4.
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Materials Advances
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2022
·Vol. 3
·期 23
·8579-8587
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IF 0
Jian Li,Huaqiang Wang,Yihong Gao,Hao Fang,Peiyu Chen,Fangzhi Huang
Two-dimensional metal–organic framework materials have attracted much attention due to their large surface area, porous structure and high carrier separation efficiency. Herein, we innovatively proposed a facile in situ vulcanization method, in which 2D Cd-MOF was used as the precursor and template to prepare a novel ultrathin CdS@1,4-benzenedicarboxylic (CdS@BDC) nanosheet in Na2S/Na2SO3 solution. The obtained CdS@BDC nanosheet has the overall morphology of a 1.46 nm average thickness nanosheet skeleton, and is uniformly in situ embedded with CdS nanoparticles with an average size of 6 nm. Due to the two-dimensional skeleton structure, the efficiency of capture, separation and migration of photogenerated carriers was significantly improved. The hydrogen evolution rate (HER) of ultrathin CdS@BDC nanosheet photocatalysts is up to 13 081 μmol h−1 g−1, which is 65 times higher than that of traditional CdS nanoparticles (199 μmol h−1 g−1). The excellent photocatalytic performance of CdS@BDC nanosheets can be attributed to the inherited structural and functional advantages of 2D Cd-MOF. For example, the efficiency of photo-generated carrier capture, separation and migration is significantly improved. For another example, the surface of the photocatalyst can adsorb a large amount of S2− ions, which not only consumes photogenerated holes as effective hole scavengers, but also accelerates the interfacial H2-production reaction due to the effective H+-capturing active sites. Thus, a tentative S2−-mediated mechanism for the enhanced photoinduced-stability of CdS@BDC nanosheets was also proposed. The present work provides a facile and fascinating strategy for the synthesis of highly efficient photocatalysts.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jie Wei,Zhiting Liu,Yanxing Zhang,Zongxian Yang,Zehao Sun,Yunpeng Li,Zhenxiang Cheng
Recently, direct Z-scheme heterojunction catalysts have become an important hotspot in photocatalytic applications due to their much stronger redox capabilities. Novel direct Z-scheme CdS@CoWO 4 spherical heterojunction photocatalysts were ingeniously designed and synthesized herein. The structural characterization and morphology analysis demonstrated that homogeneous heterojunctions between CdS and CoWO 4 were indeed formed in the composite photocatalysts. Moreover, CdS@CoWO 4 heterojunction photocatalysts exhibited excellent degradation capability towards refractory micropollutants (Pharmaceutical intermediates, dyes, and industrial additives, etc ) in wastewater. Especially, the strongest photocatalytic activity reflected by the highest reaction kinetic parameter ( k = 8.13 × 10 −2 min −1 ) was observed in the CdS-2CoWO 4 catalyst with the mass ratio of CdS:CoWO 4 = 1:2, which is nearly 4 and 58 times as high as that of pure CdS ( k = 2.21 × 10 −2 min −1 ) and CoWO 4 ( k = 1.39 × 10 −3 min −1 ), respectively. First-principles study combined with the radical species trapping experiments revealed that the charge transfer pathways and mechanisms in these heterojunctions favor the direct Z-scheme rather than the traditional Type-II mode. A key built-in electric field formed at the contact interfaces of CdS and CoWO 4 drives the Z-scheme charge transfer mechanism, which strengthens the redox capacity of photogenerated carriers and ultimately greatly enhances the photocatalytic activity of the heterojunction catalysts. It is worth applauding that CdS and CoWO 4 can form such Z-scheme heterostructures in a wide span of component ratios, which is of great benefit for their practical applications in environmental remediation.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Zhicheng Zhang,Chao Xu,Xudong Xiong,Chen Wang,Qi Zhang,Zhao Fan,Yongqian Wang
The application of CdS in pollutant degradation was limited due to the rapid compounding of photogenerated carriers. A ternary Au@NH 2 -MIL-125(Ti)/CdS (5Au@40NMT/CdS) composite catalyst was synthesized with a two-step method and methylene blue (MB) was used as simulate contaminants to evaluate its photocatalytic performance under simulated visible light. The compounding of NH 2 -MIL-125 and the loading of Au nanoparticles significantly enhanced the photodegradation performance of the composite catalyst. Compared with pure CdS, the ternary composite catalyst exhibited higher degradation efficiency (93.3 %) and higher degradation rate (9 times that of CdS)within 30 min, which was attributed to the high specific surface area and the synergistic effect of the three components that accelerated the carrier separation and broadened the photoresponse range. In addition, superoxide radical (·O 2 - ) was identified as the main active species in the MB degradation process by the electron spin resonance (ESR) technique. This work was expected to give a strategy for the fabrication and design of CdS/MOF composite catalysts in the field of pollutant degradation.
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Catalysts
·
2022
·Vol. 12
·期 7
·774
·
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
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