ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 29
·期 48
·73282-73291
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IF 5.19
Sun Yubing,Xiao Jingting,Huang Xinshui,Mei Peng,Wang Huihui
CdS-based composites as the highly efficient photocatalyst have been extensively investigated in recent years due to the suitable band gap and high photocatalytic efficiency. In this study, the effect of various factors (pH, U(VI) concentration, contents, and types of photocatalyst) on photocatalytic reduction of U(VI) by MoS 2 /CdS composite was investigated. The optimized experimental conditions (e.g., pH 7.0, 20 mg/g U(VI), and 1.0 g/L photocatalyst) was obtained by batch techniques. Approximately 97.5% of U(VI) was photo-catalytically reduced into U(IV) by 2.5 wt% MoS 2 /CdS composite within 15 min. After 5 cycles, 2.5 wt% MoS 2 /CdS composite still exhibited the high removal efficiency of U(VI) under 50-min irradiation, indicating the good stability. The photo-reduction mechanism of U(VI) on MoS 2 /CdS composite was attributed to the O − 2 radicals by quenching experiments, ESR, and XPS analysis. The findings indicate that CdS-based catalyst has a great potential for the photocatalytic reduction of uranyl in actual environmental remediation.
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 MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 17
·1-12
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IF 2.8
Ramya A. Janaki,Shobanadevi N.,Mangaiyarkarasi S. P.,Sankar R.
Promoting the charge separation to improve photocatalytic performance of semiconductor photocatalysts is very important in the field of artificial photosynthesis. Here, a novel MoS 2 /CdS 2D–2D ultrathin nanosheet heterostructure was fabricated via a one-pot solvothermal route. The obtained 2D–2D MoS 2 /CdS nanojunction has not only provided large contact areas, but also shortened the charge-transport distance, resulting in significantly enhanced photocatalytic H 2 evolution property. By optimizing the 2D MoS 2 amounts in the heterojunction, the 5 wt% 2D/2D MoS 2 /CdS heterojunction displayed the maximal photocatalytic H 2 evolution rate of 5566 μmolh −1 g −1 under visible-light irradiation in the presence of lactic acid as the sacrificial reagent, which was 10.1 times higher than that of pristine 2D CdS (516 μmolh −1 g −1 ). Based on the photoelectrochemical and photoluminescence spectra tests, it could be deduced that the charge separation and transfer of 2D/2D MoS 2 /CdS heterojunction were tremendously improved, and the recombination of photoinduced electron–hole pairs was effectively impeded. Moreover, the 2D MoS 2 was used as a co-catalyst to provide the abundant active sites and lower the overpotential for H 2 generation reaction. The current work would offer an insight to fabricate the 2D/2D heterojunction photocatalysts for splitting H 2 O into H 2 .
研究领域:
材料科学
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光催化
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能源转换
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Chong Chen,Qiuhao Li,Fengqing Wang,Changjiang Hu,Jun Ma
Precise defect engineering of photocatalysts is highly demanding but remains a challenge. Here, we developed a facile and controllable γ-ray radiation strategy to assemble dual-vacancies confined MoS 2 -CdS-γ nanocomposite photocatalyst. We showed the solvated electron induced homogeneous growth of defects-rich CdS nanoparticles, while the symbiotic • OH radicals etched flower-like 1T/2H MoS 2 substrate surfaces. The optimal MoS 2 -CdS-γ exhibited a H 2 evolution rate of up to 37.80 mmol/h/g under visible light irradiation, which was 36.7 times higher than that of bare CdS-γ, and far superior to those synthesized by hydrothermal method. The microscopic characterizations and theoretical calculations revealed the formation of such unprecedented dual-sulfur-vacancies ensured the tight interfacial contact for fast charge separation. Besides, the existence of 1T-MoS 2 phase further improved the conductivity and strengthened the adsorption interaction with H + intermediate. Therefore, the radiolytic radical chemistry offered a facile, ambient and effective synthetic strategy to improve the catalytic performances of photocatalytic materials.
研究领域:
材料科学
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纳米技术
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光催化
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化学工程
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Jianhui Liu,Peipei Chen,Fangquan Xia,Zhen Liu,Hanbiao Liu,Jiangle Yi,Changli Zhou
A "signal on" aptasensor was fabricated for chlorpyrifos detection by a highly efficient electrochemiluminescence resonance energy transfer (ECL-RET) strategy between MoS 2 /CdS nanospheres and silver/carbon quantum dots (Ag/CQDs). Compared with the conventional MoS 2 /CdS nanosheets, the MoS 2 /CdS nanospheres have a larger specific surface area and electron density, which makes the catalytic effect on K 2 S 2 O 8 stronger and has higher luminescence intensity. As a receptor, through the synergistic effect of Ag NPs and CQDs, it has a very wide absorption band between 300 and 600 nm. The absorption band and the emission spectrum of MoS 2 /CdS completely overlap, and the high quantum yield of Ag/CQDs can achieve efficient energy resonance transfer. The proposed ECL aptasensor provided a linear range from 10 nM to 1.0 fM for chlorpyrifos detection and the detection limit of 0.35 fM (S/N = 3) under optimal experimental conditions. The method was successfully applied to the detection of chlorpyrifos in fruit and vegetable samples with satisfactory results.
研究领域:
分析化学
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环境科学
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食品科学
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DOI
高影响因子
Molecular Catalysis
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2024
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IF 3.9
Xin-Ni Shao,Yin-Feng Wang,Ming-Yu Qi,Zi-Rong Tang
Simultaneous utilization of photogenerated electrons and holes within a photoredox system enables effective hydrogen (H 2 ) production and organic synthesis, aligning with eco-friendly chemistry principles and current energy challenges. Here, we report the preparation and application of cocatalyst MoS 2 decorated CdS (MoS 2 CdS) composites for the photoredox-mediated C–N coupling of amines to imines and H 2 generation under visible light illumination. The H 2 and N-benzylidenebenzylamine yields for the optimal MoS 2 CdS are 28.9 and 15.0 times higher than those of bare CdS, respectively. Mechanism studies reveal that the enhanced photocatalytic activity results from the MoS 2 acting as an electron sink, which accelerates the separation and migration of photogenerated charge carriers. Additionally, the pH(•CH)NH 2 intermediates are found to play a pivotal role in the dehydrogenative coupling of benzylamine. Furthermore, the MoS 2 CdS composites exhibit universal applicability in the conversion of various aromatic amines into corresponding imines integrated with H 2 evolution.
研究领域:
化学
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材料科学
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能源科学
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DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 4
·379
·
IF 3.444
Guannan He,Yimin Zhang,Qinyu He
High-rate recombination of photogenerated electron and hole pairs will lead to low photocatalytic activity. Constructing heterostructure is a way to address this problem and thus increase the photoelectrochemical performance of the photocatalysts. In this article, molybdenum sulfide (MoS2)/cadmium sulfide (CdS) nanocomposites were fabricated by a facile solvothermal method after sonication. The CdS nanoparticles immobilized on the MoS2sheet retained the original crystal structure and morphology. The composites exhibit higher photoelectrochemical properties compared with pure MoS2nanosheets or CdS powder. When the precursor concentration of CdS is 0.015 M, the MoS2/CdS composites yield the highest photocurrent, which is enhanced nearly five times compared with pure CdS or MoS2. The improved photoelectrochemical performance can be ascribed to the increase of light harvest, as well as to the heterostructure that decreases the recombination rate of the photogenerated electron and hole pairs.Keywords:MoS2nanosheets;CdS nanoparticle;heterostructure;photocatalysis;photoelectrochemical properties
研究领域:
材料科学
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光化学
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纳米技术
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Jimin Du,Huiming Wang,Mengke Yang,Fangfang Zhang,Haoran Wu,Xuechun Cheng,Sijie Yuan,Bing Zhang,Kaidi Li,Yina Wang,Hyoyoung Lee
Efficient production of hydrogen through visible-light-driven water splitting mechanism using semiconductor-based composites has been identified as a promising strategy for converting light into clean H 2 fuel. However, researchers are facing lots of challenges such as light absorption and electron-hole pair recombination and so on. Here, new sheet-shaped MoS 2 and pyramid-shaped CdS in-situ co-grown on porous TiO 2 photocatalysts (MoS 2 CdS TiO 2 ) are successfully obtained via mild sulfuration of MoO 3 and CdO coexisted inside porous TiO 2 monolith by a hydrothermal route. The scanning electron microscopy and transmission electron microscopy results exhibit that the MoS 2 CdS TiO 2 composites have average pore size about 500 nm. The 3%MoS 2 10%CdS TiO 2 demonstrated excellent photocatalytic activity and high stability for a hydrogen production with a high H 2 -generation rate of 4146 μmol h −1 g −1 under visible light irradiation even without noble-metal co-catalysts. The super photocatalytic performance of the visible-light-driven hydrogen evolution is predominantly attributed to the synergistic effect . The conduction band of MoS 2 facilitates in transporting excited electrons from visible-light on CdS to the porous TiO 2 for catalytic hydrogen production, and holes to MoS 2 for inhibiting the photocorrosion of CdS, respectively, leading to enhancing the efficient separation of electrons and holes.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2024
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IF 5.3
Yanxue Yue,Jingting Xiao,Weiyu Zhu,Bo Zhang,Rongbo Hou,Alhadi Ishag,Yubing Sun
The introduction of MoS 2 is beneficial to the separation and transfer of photogenerated electron–hole pairs for CdS/TiO 2 . Herein, MoS 2 /CdS/TiO 2 composites were synthesized by one-step solvothermal method at 200 °C and applied to photocatalytic reduction of U(VI) from aqueous solutions. The batch characterizations showed the irregular spherical MoS 2 /CdS/TiO 2 composites with low bandgap (1.95 eV) and high chemical stability. MoS 2 /CdS/TiO 2 composites displayed the rapid removal rate of U(VI) (more than 90 % under 15 min illumination), good regeneration (> 91 % after four cycles) due to the highly efficient separation of electron-hole pair. The possible photocatalytic pathway was demonstrated to be the main active ·O 2 − radical by quenching experiments, ESR and XPS analysis. This work highlights the potential application of MoS 2 /CdS/TiO 2 on removal of radioactive wastewater in the actual remediation.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Lei-Lei Li,Xing-Liang Yin,Dong-Hui Pang,Xin-Xin Du,Han Xue,Hua-Wei Zhou,Qing-Xia Yao,Huai-Wei Wang,Jun-Chao Qian,Jie Yang,Da-Cheng Li,Jian-Min Dou
Exploration of cost-efficient and high-performance photocatalyst for H 2 evolution by using a facile approach is of great importance. In this manuscript, a facile one-pot method was employed to fabricate MoS 2 /CdS heterostructures with MoS 2 intimately grown on the surface of CdS resulting in the formation of well-defined heterostructures. Screen experiment reveals the optimized photocatalytic H 2 evolution performance of MoS 2 /CdS is far exceeding that of pristine CdS by a factor of more than 162. The outstanding performance can be ascribed to the formation of heterostructures which accelerate charge transportation and separation, and the MoS 2 serving as a cocatalyst for the decrease of H 2 overpotential. Moreover, the photocatalytic mechanism of the MoS 2 /CdS was carefully investigated, which contributes to the deep understanding of the photocatalytic process and the designation of other low-cost and high-efficient photocatalyst.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 20
·16711-16719
·
IF 3.289
M. Zirak,M. Ebrahimi,M. Zhao,O. Moradlou,M. Samadi,A. Bayat,H.-L. Zhang,A. Z. Moshfegh
A very simple and well-controlled procedure was employed to prepare CdS nanoparticle/few-layer MoS2 nanosheet/Indium tin oxide (ITO) thin film heterostructures. To tune and fabricate the CdS/MoS2(t)/ITO thin films with various surface topographies, first electrophoretic deposition (EPD) was used to deposit MoS2 nanosheets on the ITO substrate under an optimized applied potential difference (8 V) for different deposition times (t) of 30, 60, 120 and 240 s. Then, CdS nanoparticles were deposited via a successive ion layer adsorption and reaction (SILAR) technique. The highest photo-current density of 285 μA cm−2 was measured for the CdS/MoS2(60 s)/ITO sample, which was about 2.3 times higher than the value obtained for bare CdS/ITO. The photo-enhancement mechanism of the CdS/MoS2(t)/ITO heterostructures was described using a stochastic model. The results show that the CdS/MoS2(60 s)/ITO electrode exhibits the highest roughness exponent (2α = 0.67) with the smoothest nanometric fluctuations, resulting in the best wetting properties, and thus, the highest interaction between the electrolyte and the sample surface, leading to the highest PEC activity. On the other hand, the samples with small α possess rough and nanometric-jagged fluctuations. The air trapping inside these microscopic surface fluctuations reduces the wettability as well as surface interaction between the sample and the electrolyte, resulting in low photo-current density.
研究领域:
材料科学
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电化学
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纳米技术
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表面科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Dingqiong Wei,Yao Ding,Zhaohui Li
To fabricate an efficient two-component Z-scheme system for visible light induced overall water splitting, CdS/WO 3 nanocomposites , with cubic CdS nanoparticles grown on the surface of hexagonal WO 3 nanorods , were prepared via a facile precipitation of Cd 2+ with S 2− in the presence of pre-obtained hexagonal WO 3 nanorods. MnO 2 and MoS 2 , the co-catalysts for O 2 and H 2 generation respectively, were selectively deposited on WO 3 and CdS in the CdS/WO 3 nanocomposites. The resultant MoS 2 –CdS/WO 3 –MnO 2 composites show photocatalytic activity for overall water splitting under visible light, with an optimized performance observed over 2.0%MoS 2 -0.2 CdS/WO 3 -1.0%MnO 2 . The visible light induced overall water splitting over MoS 2 –CdS/WO 3 –MnO 2 nanocomposites can be attributed to the presence of a Z-scheme charge transfer pathway in the CdS/WO 3 nanocomposites, ie, the transfer of the photo-generated electrons from the CB of WO 3 to the VB of CdS to recombine with the photo-generated holes through an efficient interface between cubic CdS and hexagonal WO 3 . The left photo-generated holes in VB of WO 3 and the photo-generated electrons in CB of CdS therefore can accomplish the water oxidation and water reduction simultaneously, with the assistance of the surface deposited cocatalysts (MnO 2 and MoS 2 ). This work demonstrated the great potential of fabricating the two-component direct Z-scheme photocatalytic systems for overall water splitting from two semiconductors with a staggered band structure .
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Sanmei Liu,Yanping Yang,Weiming Xiao,Siyao Xia,Caiju Jin,Wen Wang,Shengchen Li,Minli Zhong,Shuhua Wang,Chao Chen
Photocatalytic technology is a unique method of treating energy crisis and environmental concern. Herein, Metal-organic frameworks (MOFs) were employed to prepare a series of visible light responsive MoS 2 /CdS heterojunction photocatalysts by facile low-temperature hydrothermal sulfurization . The structural analysis revealed that the prepared MoS 2 /CdS heterojunction exhibited highly porous structure and the intimate interface was formed between the MoS 2 and CdS. For these structure features, the charge separation and transfer were significantly improved, and the MoS 2 /CdS heterojunction presented efficient photocatalytic activity towards hydrogen evolution and degradation of rhodamine B (RhB) and tetracycline hydrochloride (TC). The highest H 2 evolution rate (3318 μmol h −1 g −1 ) was found at the 5 wt%-MoS 2 /CdS, which were 10 times and 6 times of pristine MoS 2 and CdS, respectively. In particular, the 5 wt%-MoS 2 /CdS can also remove 95% RhB and 90% TC within 40 min. Moreover, the MoS 2 /CdS heterojunction showed good photocatalytic stability for hydrogen evolution and degradation of RhB and TC. Furthermore, the radical trapping experiment revealed that the photogenerated · O 2 − played critical role in RhB degradation and the hole (h + ) and · O 2 − were essential for TC degradation. The work will provide a guidance for rational design and facile preparation of photocatalyst for the visible light-driven hydrogen evolution and elimination of organic pollutants.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）