NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 44
·21078-21084
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IF 3.925
Xing-Liang Yin,Lei-Lei Li,Yan-Lan Wang
An efficient and stable CdS@MoS2 core@shell heterostructure was prepared by using a facile solvothermal approach. The MoS2@CdS heterostructure reveals efficient charge separation, giving rise to excellent performance on H2 generation from photocatalytic lactic acid decomposition. Thanks to the MoS2 shell protection, CdS corrosion was significantly prohibited, thus resulting in the long-term photocatalytic stability of the CdS@MoS2 heterostructure. The corresponding charge transfer properties and catalytic mechanism have been analyzed and discussed in detail. The present study provides a novel insight into the design of high performance and cost-effective photocatalysts.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Mingkun Gao,Guangyang Liu,Qiyue Tan,Chenxi Zhao,Ge Chen,Rongqi Zhai,Yuwei Hua,Xiaodong Huang,Jing Wang,Donghui Xu
A novel fluorescent composite (CDs@ZIF-L) was synthesized for the selective detection of Fe 3+ based on the encapsulation of Carbon dots (CDs) into Zeolitic imidazolate frameworks (ZIF) with a two-dimensional leaf-like structure. The physicochemical structure, surface morphology, and composition of the adsorbent were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The results showed that unlike the conventional three-dimensional rhombic structure (ZIF-8), the synthesized two-dimensional leaf-like nanosheets (ZIF-L) not only maintained the structural integrity but also had a permeable pore structure. Importantly, at an excitation wavelength of 350 nm, the composite's had significant fluorescence emission at 445 nm and was effectively quenched in the presence of Fe 3+ , which can be used as an effective fluorescent scaling probe. Under the optimal conditions, CDs@ZIF-L was used as a fluorescent probe to detect Fe 3+ with good linearity in the range of 0.02–2 mM (R 2 = 0.9948) and a low detection limit of 0.891 μM. The fluorescent probe can also be used for the determination of Fe 3+ in fruit samples with good recovery and accuracy, showing great potential for applications in environmental monitoring and agricultural pollutant control. It has good recovery and accuracy and shows great potential for environmental monitoring and agricultural pollutant control.
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Materials Today Energy
·
2022
·
IF 9.257
Shanshan Qiao,Chao Feng,Tingxiang Chen,Yuli Kou,Wei Wang,Changyan Guo,Yi Zhang,Jide Wang
Industrial applications of water splitting to produce hydrogen and carbon dioxide reduction to produce high value added products remain significant challenges, owing to the low density of electrons and holes produced by photoexcitation, rapid recombination of photogenerated carriers and sluggish redox reactions . Direct Z scheme photocatalysts have attracted much attention due to their excellent space–photogenerated electron−hole pairs and stronger redox ability. Herein, the core−shell direct Z scheme construct was established by a structure of NiO/Ni coated CdS spherical, finally achieved photocatalytic pure water splitting, simultaneously produced with stoichiometric ratio 2:1 (include 42.5 μmol g − 1 h − 1 H 2 and 20.1 μmol g − 1 h − 1 O 2 ), AQY (apparent quantum yield) was 1.6% (in pure water system, λ = 420 nm) and STH (Solar to Hydrogen Conversion Efficiency) was 2.1 × 10 −4 %. The yield of CO from photocatalytic reduction of carbon dioxide was 36.7 μmol g − 1 h − 1 . Insight into the reaction mechanism provides an initial attempt to reveal the direct Z scheme of NiO@CdS and the Schottky junction of NiO/Ni together to promote the photocatalytic performance. This work can provide a strategy scheme for constructing a bifunctional sphere−shell direct Z scheme catalyst and applying it to photocatalytic overall water splitting and carbon dioxide reduction.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 24
·11934-11945
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IF 3.925
Wenxuan Ma,Chenggong Zhang,Shuhua Hao,Yupeng Xing,Gang Zhao,Shipeng Qiu,Changwen Zhang,Xiaoke Wang
Developing semiconductor catalysts with high catalytic activity and good economic benefits is an important and challenging task in the field of photocatalysis. In this study, CdS nanosheets with a three-dimensional hollow structure were grown on MoS2 nanosheets by a hydrothermal method. The hydrogen production of the CdS@MoS2-25 wt% composites is 8.2 mmol in 3 h, which is 43.71 times that of pure CdS and 4.7 times that of Pt. Density functional theory (DFT) was used to further study the band structure of the composites. The experimental and calculation results show that the addition of co-catalyst MoS2 reduces the band gap of CdS and accelerates the transfer rate of photogenerated electrons. The construction of a n–n homogeneous structure reduces the interface transmission resistance of the carriers, and the photocatalytic performance of the composite material has been significantly improved. Therefore, the composite material is an excellent semiconductor photocatalyst that can replace precious metals in the reaction. In addition, after adding the promoter MoS2 to participate in the photocatalytic reaction for 12 h, the composite material still maintains high photocatalytic activity, and the recombination rate of photogenerated carriers is greatly reduced, which proves that the photocatalyst has good stability.
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Analytical Methods
·
2022
·Vol. 14
·期 17
·1721-1729
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IF 3.532
Di Deng,Xiaoyu Fang,Ding Duan,Kang Li
There is a critical need for the rapid detection of p-chlorophenol produced by pesticide abuse and industrial wastewater discharge, which has been an urgent problem in the realm of environmental protection. Here, a green and environmentally friendly method was developed to prepare stable and low toxicity quantum dots. First, blue-green fluorescent FeS2 quantum dots (B-FeS2 QDs) were prepared with FeCl3·6H2O (an iron source) and L-cysteine (a capping agent) by the solvothermal method. By combining B-FeS2 QDs with orange carbon dots (O-CDs), a CDs@SiO2/FeS2@MIPs visual fluorescence sensor for the selective detection of p-chlorophenol was constructed. Under optimum conditions, this sensor exhibited a detection limit of 1.265 μM with a linear range of 5.00–50.00 μM and was successfully applied to detect p-chlorophenol in real samples. Moreover, this sensor was successfully applied to visual semi-quantitative detection of p-chlorophenol. This work demonstrated that these sensors, based on FeS2 QDs and CDs, had potentials for in situ and visual detection of environmental contaminants.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 6
·2065-2078
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IF 4.478
Ou Panpan,Wu Jiawen,Lin Yu,Tan Xuecai,Wu Yeyu,Chen Zhifan,Wei Fucun,Huang Kejing
Chloramphenicol (CAP) is widely used in the food industry and animal husbandry due to its effective antibiotic effect active against gram-positive and gram-negative microorganisms. However, research shows that it can cause serious adverse reactions and side effects in the human body. In order to effectively monitor the residues of CAP, a novel and simple photoelectrochemical (PEC) sensor for sensitive detection of CAP is fabricated based on M-TiO 2 -CdTe QDs/CdS QDs composite. The results show that the prepared M-TiO 2 not only retains the original morphology and structure of MIL-125(Ti), but also exhibits more abundant pore structure and good photoelectrochemical properties. Compared with M-TiO 2 , the as-prepared M-TiO 2 -CdTe QDs/CdS QDs composite exhibits excellent PEC performances including about ninefold enhancement of photocurrent intensity, which is ascribed to the large surface of M-TiO 2 and the introduction of CdTe QDs and CdS QDs. Based on the selective inhibitory effect of CAP in the photocurrent intensity of the M-TiO 2 -CdTe QDs/CdS QDs PEC system, a novel PEC sensor for CAP concentration determination is constructed. The designed PEC sensor demonstrates a linear range from 1 to 140 nmol L −1 with a detection limit of 0.14 nmol L −1 (S/N = 3). Moreover, the method is applied to real milk samples to quantify the CAP residues with spiked recoveries in the range of 96.3–106%, and the possible detection mechanism of the M-TiO 2 -CdTe QDs/CdS QDs PEC system is also discussed. Graphical abstract
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Ming-Yu Qi,Qiong Lin,Zi-Rong Tang,Yi-Jun Xu
Coupling CO 2 photoreduction with selective organic synthesis offers a promising modus operandi to enable simultaneous utilization of photogenerated electrons and holes to realize solar fuels production and chemicals synthesis. Herein, we report a bifunctional zero-dimensional cadmium sulfide quantum dots-two-dimensional titanium dioxide nanosheets (CdS/TNS) heterostructure for photoredox-catalyzed coupling of C–C bond synthesis via selective oxidation of benzyl alcohol with CO 2 photoreduction to CO under visible light. The compositing heterointerface is beneficial for the adsorption and activation of CO 2 , thereby promoting the photoreduction of CO 2 . Remarkably, the synergistic interaction between CdS and TNS tunes the selectivity of benzyl alcohol oxidation from carbonyl compound to the C–C coupled products. Mechanistic studies unveil that the generation of C–C coupled products processes via key radical •CH(OH)Ph intermediates. Theoretical simulations reveal that the weaker adsorption of •CH(OH)Ph radical over CdS/TNS than bare CdS contributes to the formation of highly selective C–C coupled products. The findings are expected to offer instructive guidance on rationally designing the dual-functional catalysts with efficient photoredox-catalyzed coupling reaction systems for integrating CO 2 reduction with selective organic transformations.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 8
·1-9
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IF 5.7
Hao Xuanxuan,Liu Zhimin,Fan Yunfeng,Wang Jie,Cui Chen,Hu Leqian
A novel electrochemiluminescence (ECL) aptasensor, using graphite carbonitride (g-C 3 N 4 ) capped CdS quantum dots (CdS QDs@g-C 3 N 4 ) and Au nanoparticles decorated triethanolamine (AuNPs@TEOA) as dual coreactants, was proposed for the determination of mucin 1 (MUC1). Higher ECL efficiency was acquired due to the double enhancement contribution of CdS QDs and TEOA to Ru (bpy) 3 2+ ECL. Additionally, AuNPs@TEOA also acted as nanocarrier for MUC1 aptamer immobilization. After the aptasensor was incubated in target MUC1, the decreased ECL emission was obtained because of the poor conductivity of MUC1. The ECL aptasensor displayed a good linear correlation for MUC1 in the range 0.1 pg mL −1 -1000 ng mL −1 , and the detection limit was 33 fg mL −1 . MUC1 spiked into human serum samples was quantified to assess the practicability of the ECL aptasensor. Graphical abstract
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Journal of Cleaner Production
·
2021
·
IF 9.297
Banghao Du,Gongduan Fan,Shangwu Yang,Zhuoyi Chen,Jing Luo,Weiwei Yu,Junyi Yu,Qi Wei,Yushan Lu
Reactive oxygen species (ROS) play a considerable role in the catalytic reaction for removing organic pollutants, however, the generation and transformation mechanism by catalyst with light and ultrasonic irradiation still requires intensive investigation. In this study, a novel Er 3+ -CdS/MoS 2 (ECMS) composite was synthesized, and the synergetic degradation effects for 17β-estradiol (17β-E2) during the sonophotocatalytic (SPC) process were investigated. The contribution of ROSs for eliminating 17β-E2 during the SPC process through quenching experiments was generally ranked in the following order: superoxide radical (•O 2 − ) ≈ hole (h + ) > hydroxyl radical (•OH) > H 2 O 2 > singlet oxygen ( 1 O 2 ). •OH plays a crucial role in 17β-E2 removal by ECMS under sonocatalysis and photocatalysis conditions. The transformation process among ROSs was further analyzed and elucidated in the light of the probe measurement results with positive or negative correlation among ROSs. Besides, we observed a phenomenon that the generated concentration of •O 2 − rises first and then falls during the SPC process, which might be attributed to the formation of 1 O 2 via the oxidation of h + or recombination with •OH. This work clarifies the underlying mechanisms of sonophotocatalytic generation and transformation of ROSs in depth.
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Journal of the American Chemical Society
·
2023
·
IF 15
Xiaolan Zhou,Chaodan Pu
Surface reconstruction can rearrange the surface atoms of a crystal without the need of growth processes and has the potential to synthesize crystals with novel morphologies and facets that cannot be obtained through regular synthesis. However, little is known about the molecular mechanisms of the surface reconstruction process. Here, utilizing surface reconstruction, we report the synthesis of nonpolar facets (110) facets)-terminated dodecahedral zinc-blende CdSe/CdS core/shell quantum dots. The morphology transformation is achieved by first fully exchanging the cadmium carboxylate ligand with oleylamine and then undergoing surface reconstruction. The surface reconstruction-induced morphology transformation is confirmed by transmission electron microscopy and absorption spectroscopy. Details of kinetic experiments and simulation results demonstrated that successful surface reconstruction must be assisted by a proton shuttle. Except for the first report on zinc-blende quantum dots terminated with (110) facets, the surface reconstruction aided by the proton shuttle offers valuable insights for devising methods to regulate the properties of nanocrystals.
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Analytical Methods
·
2023
·
IF 3.1
Yuxuan Bai,Mingwang Liu,Yu He,Gongwu Song
Recent years have witnessed the ever-increasing achievements of Ti3C2 MXene quantum dots (Ti3C2 MQDs) and their vital contributions to fluorescent biosensing. However, the applicability and flexibility of most Ti3C2 MQDs-based sensors are limited by their emission of a single blue wavelength. To address this issue, we present a facile strategy to utilize carbon dots as the model to construct a ratiometric fluorescent sensor based on fluorescence resonance energy transfer to quantitatively monitor crystal violet. The fabricated probe exhibited dual emission at 440 and 565 nm respectively, when introducing crystal violet, the peak at 565 nm was quenched but 440 nm remained constant. Further aiming for portable, convenient, and on-site analysis, an innovative smartphone-assisted platform provides promising perspectives on the future in-situ quantitation. This work creates a general strategy for constructing the Ti3C2 MQDs-based composite fluorescent system, as well as suggests great application potential in food security monitoring.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 40
·18865-18871
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IF 3.3
Chao Liu,Gang-Gang Chang,Ting-Ting Luo,Yi-Tian Wang,Shi-Tian Xiao,Yao Yao,Hong-Jian Xu,Ge Tian,Christoph Janiak,Hai-Hu Yu,Xiao-Yu Yang
Metal–organic frameworks (MOFs) have great potential for producing photoelectrocatalyzed hydrogen and degrading pollutants, owing to several factors such as high porosity and tunable semiconductor-like properties. Wide band gaps, which restrict their use to only UV light induced reactions, and low efficiencies for the separation of photogenerated charge carriers (electrons and holes) pose significant challenges to the widespread applications of MOFs. In this study, a hierarchical hollow Pt@H-UiO-66-NH2/CdS ternary catalyst was designed and synthesized. The immobilized CdS nanoparticles (NPs) in this catalyst endow the MOF H-UiO-66-NH2 with high visible light absorption ability and the Pt NPs serve as electron sinks to improve charge carrier separation. Furthermore, the hierarchical hollow structure of H-UiO-66-NH2 in the composite contributes to boosting light absorption and shortening the distance for charge transfer. As a proof of principle, Pt@H-UiO-66-NH2/CdS catalyzes methylene blue (MB) degradation with a high rate constant of 1.025 × 10−2 and hydrogen production with a rate of 12 810 μmol g−1 h−1, the latter of which is about 2.3, 11.7 and 173 times higher than those of Pt@UiO-66-NH2/CdS, H-UiO-66-NH2/CdS and Pt@H-UiO-66-NH2, respectively.
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