JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Chun-Hui Gao,Shi-Ming Zhang,Fang-Fang Feng,San-San Hu,Qian-Fan Zhao,Yong-Zheng Chen
Visible-light-driven nicotinamide adenine dinucleotide (NADH) regeneration is one of the most effective measures, and cadmium sulfide (CdS) materials are typically used as low-cost photocatalysts. The CdS photocatalysts, however, still suffer from low regeneration efficiency and poor cycle stability. In this work, the CdS quantum dots (QDs) less than 10 nm embedded onto silica gel (CdS QDs/Silica gel) were constructed for visible-light-driven NADH regeneration by a successive ionic layer adsorption reaction and ball milling method. Results demonstrate that the photosensitivity of the CdS QDs/Silica gel composite was 31 times higher than that of the bulk CdS. Moreover, the conduction band (CB) edge of the CdS QDs/Silica gel composite is −1.34 eV, which is more negative 0.5 eV than that of the bulk CdS. The obtained CdS QDs/Silica gel composites showed the highest NADH regeneration yields of 68.8% under visible-light (LED, 420 nm) illumination and can be reused for over 40 cycles. Finally, the bioactivity of NADH toward enzyme catalysis is further confirmed by the hydrogenation of benzaldehyde to benzyl alcohol catalyzed with an alcohol dehydrogenase as enzyme catalysis.
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ACS Applied Nano Materials
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2023
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IF 5.9
Xinbing Jiang,Shaochong Zhu,Huan Yang,Yuxi Fei,Jiuhong Wang,Shujiang Ding
Intracellular three-dimensional (3D) thermal mapping is a valuable technical tool for answering fundamental scientific questions about cellular thermal behavior and subcellular diagnostic therapy. The best method for achieving intracellular 3D thermal imaging is to collect intracellular temperature response while also obtaining a 3D position for the corresponding location. However, temperature measurement in cell space has not been accurately characterized due to the difficulty in accurately locating the 3D position in microregions. In this article, we developed a QD-based intracellular 3D thermal imaging system by combining QD fluorescence thermometry with double-helical point spread function (DH-PSF)-based axial localization. Liposome transfection was used to achieve the cellular uptake of CdTe/CdS/ZnS QDs in HOS cells. Five QDs’ temperatures with spatial distribution in living cells were realized in the axial range of 1.35 μm by collecting the thermosensitive fluorescence emission of discrete QDs and the axial imaging localization information, and their 3D thermal image distribution was mapped. Measurements and analysis show that the combination of QD fluorescence thermometry and axial localization of DH-PSF enables the acquisition of thermal image information in intracellular 3D microregions. Using this system, temperature variations at 3D locations in living cells exposed to ionomycin Ca2+ stress were also monitored. The method described in this article can be applied broadly to the study of intracellular space thermal response and thermal regulation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Yongzhuo Yu,Wei Li,Huixing Yang,Qiuming Wei,Linlin Hou,Zhiliang Wu,Yangyang Jiang,Chaoyu Lv,Yuxin Huang,Jiyu Tang
The construction of heterojunction systems is an effective way to efficiently generate hydrogen by water photolysis. In this work, Ni-MOF (trimesic acid, (BTC)) and g-C 3 N 4 (denoted as CN) were combined, and then Ni-MOF/CN was modified by 4-Methyl-5-vinyl thiazole (denoted as MVTh). Finally, CdS was loaded on the surface of Ni-MOF/CN/MVTh to prepare the photocatalyst Ni-MOF/g-C 3 N 4 /MVTh/CdS (denoted as Ni/CN/M/Cd) with a triangular closed-loop path heterojunction for the first time. As a photocatalyst without precious metal cocatalysts, Ni/CN/M/Cd displayed high H 2 evolution (17.844 mmol·g −1 ·h −1 ) under an optimum CdS loading of 40 wt%. The H 2 evolution rate was approximately 79 times that of Ni-MOF/CN and exceeded those of almost all catalysts based on MOF/CN in the literature. The triangular closed-loop heterojunction formed between Ni-MOF, g-C 3 N 4 , and CdS could realize the directional migration of photocarriers and significantly diminished the transfer resistance of carriers. The Ni 2+ in Ni-MOF provided many cocatalytic sites for H 2 evolution via g-C 3 N 4 and CdS. Furthermore, charge carrier separation in Ni-MOF/CN/CdS improved after the innovative addition of MVTh. This study provides a reference for the construction of a closed-loop heterojunction system without precious metal cocatalysts.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Xiaowu Wang,Zhigang Zeng,Yu Fan,Xiaoer Wang,Shenghao Wang,Jiaqiang Xu
Sn 1−x S-CdS superlattice nanowires (NWs) with fast response and good selectivity in low-temperature operating environments for potential applications as gas sensing materials, were designed rationally and synthesized controllably. This work investigated in detail the dual selective gas sensing performance of Sn 1−x S-CdS superlattice nanowires that crystal facets change with the tunable composition . The results demonstrated that the Sn 0.38 S-CdS superlattice NWs with the structure of (0 0 4) lattice plane of SnS growing epitaxially along the [0 0 2] crystallization direction of CdS . And the gas sensors based on Sn 0.38 S-CdS superlattice NWs displayed the best gas sensing properties, including ultrafast response to acetone with 1 s at 290 °C, and good selectivity to H 2 S with selectivity value of 29886% at 190 °C. The gas sensing mechanism was carefully investigated by the chemical stability of gas molecules and the adsorption energy on the different crystal planes, as well as the energy band structure of the heterostructure . The study highlights an efficient rout to the development of high-performance multi-functional gas sensors.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Kailu Li,Hui Pan,Fang Wang,Zhengguo Zhang,Shixiong Min
Herein, a NiS nanoparticle-socketed CdS photocatalyst (NiS/CdS- e ) is developed by hydrothermal sulfurization of Ni-doped Cd(OH) 2 precursor, where the Cd(OH) 2 particles are converted into CdS while the doped Ni species are exsolved and socketed on the surfaces of CdS. 2% NiS/CdS- e presents a high H 2 evolution rate of 18.9 mmol g −1 h −1 with an apparent quantum efficiency (AQE) of 13.9% at 420 nm, much superior to those of pristine CdS (0.5 mmol g −1 h −1 ) and 2% NiS/CdS- h (9.9 mmol g −1 h −1 ) prepared by impregnation-hydrothermal sulfurization. The enhanced activity originates from the strongly coupled interface between exsolved NiS and CdS that efficiently promote the charge separation, while the exsolved NiS nanoparticles serve as highly active H 2 evolution sites. Moreover, the strongly coupled interfaces enable improved H 2 evolution stability for 2% NiS/CdS- e over a 30-h cycling reaction. This work provides an effective strategy toward strongly coupled cocatalyst/semiconductor photocatalysts for efficient solar energy conversion.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Zhan Shu,MengQi Li,Lu Gan,Lijia Wan,Xiaoling Chen,Xiaohang Zhang,Weijun Gui
Highly luminescent GdVO 4 :Eu 3+ /carbon dots (CDs) nanocomposite was synthesized by hydrothermal deposition method for the first time. With the use of dialyzed CDs solution as precursor, the synthetized composite shows negligible emission intensity of CDs. On replacing the dialyzed CDs solution with the crude one, highly luminescent composite can be obtained successfully. Based on the analysis of XPS and FT-IR spectra, one can deduce that the existence of a large amount of citrate anions, ethylenediamine cations and polymer-like CDs in the crude CDs solution make it as nutrient solution of CDs, which can not only facilitate growth of CDs on the surface of GVE, but also greatly prevent nitrogen atoms from falling off the particles during the hydrothermal deposition process. For the dialyzed CDs solution, due to the ions and polymer-like CDs being thoroughly dialyzed, the coated CDs are fragile during hydrothermal deposition process. Besides, the effects of different dosages of ammonia on emission intensities of the two composites are studied. Based on the designable patterns for security application, one can think that the highly luminescent composite is one of the most promising candidates in the anti-counterfeiting field.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2022
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IF 5.141
Qianshu Xia,Yun Hao,Suimin Deng,Lina Yang,Ruoxin Wang,Xiangfeng Wang,Yuan Liu,Hailing Liu,Mengxia Xie
s Water pollution induced by the productive process of organic dyes would lead to various diseases, and so treatment of the wastewater is an urgent task for protecting human health and ecological environment. In this work, visible light responsive heterojunction material based on silver iodide and carbon dots (CDs) doped ZIF-8 metal organic frameworks ( [email protected] @AgI) has been prepared by a green solvent-free strategy and in-situ ion deposition method. The [email protected] @AgI composites have high photocatalytic performance for degradation of acridine orange (AO) dye under visible light, and the maximum degradation percentage can reach to 96.0%, which was estimated by the UV–visible spectroscopy. The porous structure and large surface area of the photocatalyst were favorable to absorption of the target dye on the catalyst, which can promote the kinetic degradation rate for low level concentration of the dye. The introduction of CDs into the AgI heterojunction can improve the electron transport efficiency and visible light absorption capacity, and thus significantly enhancing the photocatalytic activity of the catalyst. The photocatalytic mechanism was proposed as indirect Z-scheme heterojunction type based on the energy band structure of the catalyst. This work provides a visible light photocatalyst for removal of the AO dye in wastewater and offers a promising strategy for developing photocatalyst for treatment of organic pollutants in the environment using solar energy.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Jingkai Min,Hongshun Hao,Yirui Zhao,Yutong Hu,Qiqi Huang,Fuxiao Zhu,Gongliang Zhang,Jingran Bi,Shuang Yan,Hongman Hou
In the present study, NaNbO 3 -CdS nanorods composites with pyroelectric effect were used to degrade RhB solution and sterilize Salmonella under room-temperature cold-hot cycles. The pyrocatalytic decomposition rate of NaNbO 3 -CdS reached 90 % under 45 cold-hot (25–55 °C) cycles while the antibacterial rate of NaNbO 3 -CdS also achieved 90 % under 45 cold-hot (17–37 °C) cycles. Compared with the pyrocatalytic effect of single NaNbO 3 , with the hole’s radicals and superoxide radicals as the main active species, the pyrocatalytic effect of the NaNbO 3 -CdS was significantly enhanced. It is mainly attributed to its surface electrons being captured by CdS, thereby reducing the recombination probability of electron pairs. After four repeated experiments, the high pyrocatalytic activity still maintained, which indicated that the property of NaNbO 3 -CdS composites was stable. The composite nanocatalyst has potential in the degradation of dye pollution and sterilization by temperature difference.
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APPLIED CATALYSIS A-GENERAL
·
2022
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IF 5.723
Chao Yin,Yali Liu,Xiaorong Kang,Xin Li
Graphitic carbon nitride (g-C 3 N 4 , CN) has been applied to degrade a variety of pollutants. However, two major defects, the low utilization of light energy and the high recombination of photogenerated electron and hole (e - -h + ) pairs, need to be improved. In this study, a LED-light-driven photocatalyst, carbon dots decorated graphitic carbon nitride (CNC), was successfully prepared by simple thermal polymerization. Due to the remarkable up-conversion photoluminescence properties and superior charge transport capability of CDs, CNC had higher e - -h + separation efficiency and broader visible light response. In this experiment, a combined process of CNC and persulfate (CNC/PS) was used for tetracycline (TC) degradation. High-efficient photocatalytic degradation rate of 81.9% was obtained in the CNC/PS system. Moreover, the mechanism analysis indicated that the reaction between PS and photogenerated e - effectively promoted the separation of electrons-holes pairs, thereby enhancing the formation of dominant active radicals •O 2 - and holes for TC degradation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Chunhua Liang,Chuantao Wang,Kaixuan Xu,Hongbin He,Qiangen Li,Chunming Yang,Xiaoming Gao
The benzaldehyde (BAD) produced by the benzyl alcohol (BA) oxidation method is comprehensively applied to food and pharmaceutical fields. However, the selectivity and conversion of photocatalytic selective oxidation of BA in aqueous solution are still far from expectation. Herein, N-CQDs/CdS composites were synthesized by the in-situ precipitation method. N-CQDs served as an "Electronic Warehouse" to boost the separation efficiency of the carrier. The electron transferred from CdS to N-CQDs made electron on the N-CQDs surface enrich, which was conducive to the formation of superoxide radicals (·O 2 - ).·O 2 - and h + could efficiently oxidize BA to BAD. In addition, according to density functional theory (DFT), the adsorption energies of BA and BAD on N-CQDs/CdS were distinctly greater than that of CdS. BAD tended to desorb from the 7.5 N-CQDs/CdS surface, and BA preferred to adsorb on the CdS surface. However, BAD was difficult to desorb from the CdS surface, resulting in the poisoning of CdS. 7.5 N-CQDs/CdS exhibited the BA conversion of 60.4% and BAD selectivity of 99%, which was 2.2 times higher than that of original CdS. This work was expected to provide a theoretical basis for improving photocatalyst carrier separation efficiency and alcohol selective oxidation performance.
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ENVIRONMENTAL RESEARCH
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2022
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IF 8.431
Yanqing Cong,Jiaxin Yi,Shengna Liang,Feng Zhang,Yi Zhang,Shi-Wen Lv
Bimetallic oxides with spinel structure show great prospects in the photocatalysis owing to many active sites. Herein, a novel 500NiCo 2 O 4 @CdS–5%Ag composite was fabricated via a feasible strategy. Interestingly, the combination with NiCo 2 O 4 could significantly enhance the absorption ability of CdS for visible light. Benefiting from the formation of heterojunction structure between NiCo 2 O 4 and CdS, the recombination of photogenerated electrons and holes was remarkably restrained. As an effective mediator, deposition of Ag could further promote the transfer of photogenerated charge carriers, thereby accelerating the reaction rate. Meanwhile, light absorption capacity of composite was also improved, owing to the surface plasmon resonance effect of metallic Ag. More importantly, 500NiCo 2 O 4 @CdS–5%Ag composite with great stability displayed an excellent performance in the photocatalytic degradation of OFX, and its highest removal efficiency was as high as 99.14%. Possible degradation pathways of OFX were given, and most of OFX could be degraded into CO 2 , H 2 O and other by-products with no toxicity. Significantly, the separation and transfer of photogenerated charge carriers followed indirect Z-scheme heterojunction mechanism. The O 2 − , OH and 1 O 2 were main active species in photocatalytic reaction system. All in all, current work inspired some new ideas for designing novel photocatalytic system in wastewater treatment .
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SOLAR ENERGY
·
2023
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IF 6.7
Chunkai Wang,Bin Yao,Yongfeng Li,Zhanhui Ding,Ding Ma,Ting Wang,JiaYong Zhang,Dongxu Zhang,Yue Liu,Ruijian Liu
The physical properties of CdS buffer layers and the interface quality between CdS layer and Cu 2 ZnSn(S,Se) 4 (CZTSSe) absorber have a significant impact on the performance of CZTSSe solar cells. In the present work, five types of CZTSSe solar cells with conventional structure (denoted as CdS- x -cells, x = 55, 60, 65, 70 and 75) were fabricated by using CdS prepared at deposition temperatures of 55, 60, 65, 70 and 75 ℃, respectively, as buffer layer, and influence mechanism of the deposition temperature of CdS layers on power conversion efficiency (PCE) of the CdS- x -cells was investigated. It is found that the PCE of the CdS- x -cells increases from 8.52% to 10.36% as the deposition temperature rises from 55 to 60 ℃ but falls from 10.36% to 7.14% from 60 to 75 ℃. The analysis on the photovoltaic and electrical parameters indicates that the increase in PCE is predominantly derived from the decreased reverse saturated current density (J 0 ), followed by the decreased series resistance (R S ) and increased shunt resistance (R Sh ). The decreased PCE with the further increasing deposition temperature is mainly contributed from the increased J 0 , followed by the decreased R Sh and photogenerated current density (J L ). The influence mechanism of deposition temperature of the CdS layer on PCE is suggested via quantitatively analysis of influence of electrical, optical properties and crystal quality of CdS prepared at various deposition temperatures on J L and electrical parameters of CdS- x -cells. This work is helpful for improvement of PCE of CZTSSe solar cells by modification of properties of buffer layer.
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