APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Wenlong Zhen,Xiaofeng Ning,Baojun Yang,Yuqi Wu,Zhen Li,Gongxuan Lu
CdS photocorrosion seriously impeded its application in photocatalysis , especially for water splitting. Here we report new strategies to improve CdS photocorrosion resistance properties significantly by coating Ni 2 P shell and assembling an artificial gill to remove newly formed O 2 from water. Ni 2 P@CdS catalyst can achieve the over-all water splitting under visible light irradiation without addition of any sacrifice reagent and noble metal loading. Compared with CdS itself, the 10Ni 2 P@CdS photocatalyst exhibits excellent photocatalytic activity for hydrogen evolution (251.4 μmol of H 2 in 180 min) with a high AQE (3.89% at 430 nm). This catalyst also presents high photocurrent, low overpotential (−0.32 V vs SCE), and long fluorescence lifetime (16.27 ns) of excited charges. Cd 2+ ions concentration measured by ICP and long term stability results verified the anti-photocorrosion role of Ni 2 P shell on CdS during water splitting reaction. The activity and stability of 10Ni 2 P@CdS is even superior to typical 1Pt@CdS catalyst. Our results confirm CdS can be an active catalyst for photocatalytic hydrogen generation from water under visible irradiation if its stability is enhanced by protection of anti-photocorrosion over-coating shell and removing the nascent formed oxygen from water.
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ACS Applied Materials & Interfaces
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2016
·
IF 7.145
Ruifeng Tong,Chang Liu,Zhenkai Xu,Qin Kuang,Zhaoxiong Xie,Lansun Zheng
Integrating wide bandgap semiconductor photocatalysts with visible-light-active inorganic nanoparticles (such as Au and CdS) as sensitizers is one of the most efficient methods to improve their photocatalytic activity in the visible light region. However, as for all such composite photocatalysts, a rational design and precise control over their architecture is often required to achieve optimal performance. Herein, a new TiO2-based ternary composite photocatalyst with superior visible light activity was designed and synthesized. In this composite photocatalyst, the location of the visible light sensitizers was engineered according to the intrinsic facet-induced effect of well-faceted TiO2 nanocrystals on the spatial separation of photogenerated carriers. Experimentally, core–shell structured Au@CdS nanoparticles acting as visible light sensitizers were selectively deposited onto photoreductive {101} facets of well-faceted anatase TiO2 nanocrystals through a two-step in situ photodeposition route. Because the combination of Au@CdS and specific {101} facets of TiO2 nanocrystals facilitates the transport of charges photogenerated under visible light irradiation, this well-designed ternary composite photocatalyst exhibited superior activity in visible-light-driven photocatalytic H2 evolution, as expected.
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LUMINESCENCE
·
2014
·Vol. 30
·期 1
·60-66
·
IF 1.675
Dan Li,Shaopu Liu,Yizhong Shen,Jidong Yang,Youqiu He
Water-soluble thioglycolic acid (TGA)-capped core/shell CdTe/CdS quantum dots (QDs) were synthesized. The interactions of rhein and emodin with TGA-CdTe/CdS QDs were evaluated by fluorescence and ultraviolet-visible absorption spectroscopy. Experimental results showed that the high fluorescence intensity of TGA-CdTe/CdS QDs could be effectively quenched in the presence of rhein (or emodin) at 570 nm, which may have resulted from an electron transfer process from excited TGA-CdTe/CdS QDs to rhein (or emodin). The quenching intensity was in proportion to the concentration of both rhein and emodin in a certain range. Under optimized conditions, the linear ranges of TGA-CdTe/CdS QDs fluorescence intensity versus the concentration of rhein and emodin were 0.09650–60 µg/mL and 0.1175–70 µg/mL with a correlation coefficient of 0.9984 and 0.9965, respectively. The corresponding detection limits (3σ/S) of rhein and emodin were 28.9 and 35.2 ng/mL, respectively. This proposed method was applied to determine rhein and emodin in human urine samples successfully with remarkable advantages such as high sensitivity, short analysis time, low cost and easy operation. Based on this, a simple, rapid and highly sensitive method to determine rhein (or emodin) was proposed. Copyright © 2014 John Wiley & Sons, Ltd.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Huanmin Liu,Jiayi Peng,Xu Zhang,Kun Zheng,Lirong Zheng,Kangle Lv,Qin Li,Peng Zhou
Employing water and biomass fuels, such as benzyl alcohol, as feedstocks for co-producing hydrogen (H 2 ) and value-added organic chemicals under solar irradiation presents a promising strategy towards accomplishing net-zero emission objectives. However, simultaneously building the optimal hydrogen-evolution and organic-dehydrogenation centers on photocatalyst surface has long been the pursuit. Herein, a facile vacancy-based strategy was utilized to engineer atomically dispersed Pt species coordinated with three foreign ligand nitrogen atoms (Pt-N 3 ) instead of intrinsic S atoms on CdS nanorods. The experimental observation demonstrates a distinctive electron-rich characteristics of Pt-N 3 structure, markedly augmenting the photogenerated charge separation efficiency via one interfacial charge effects. The density functional theory (DFT) simulation further indicates that the foreign ligand N atoms not only maintain the low hydrogen-evolution energy barrier of Pt center, but also greatly reduce the energy barrier of rate-determining benzyl alcohol dehydrogenation by forming the strong chemical interaction between ligand N atom and intermediate. Consequently, PtN 3 -CdS exhibited a high photocatalytic activity for coproduction of H 2 (5.4 mmol g −1 h −1 ) and benzaldehyde (5.2 mmol g −1 h −1 ) with a selectivity of 95.9% for value-added benzaldehyde, with the anticipation of bolstering its commercial accessibility and expediting its integration into industrial applications.
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Biomolecules
·
2024
·Vol. 14
·期 12
·1568
·
IF 4.8
Rui Wang,Junping Xue,Guo Wei,Yimeng Zhang,Chuanliang Wang,Jinhua Li,Xuhui Geng,Abbas Ostovan,Lingxin Chen,Zhihua Song
The development of a novel strategy for the measurement of SARS-CoV-2 IgG antibodies is of vital significance forCOVID-19diagnosis and effect of vaccination evaluation. In this investigation, an SiO2@Au@CDs nanoparticle (NP)-based lateral flow immunoassay (LFIA) strip was fabricated and coupled with a miniaturized fluorimeter. The morphology features and particle sizes of the SiO2@Au@CDs NPs were characterized carefully, and the results indicated that the materials possess monodisperse, uniform, and spherical structures. Finally, this system was employed for SARS-CoV-2 IgG antibody test. In this work, the strategy for the SARS-CoV-2 IgG antibody test possesses several merits, such as speed (less than 15 min), high sensitivity (1.2 × 10−7mg/mL), broad linearity range (7.4 × 10−7~7.4 × 10−4mg/mL), accurate results, high selectivity, good stability, and low cost. Additionally, future trends in LFAs using quantum dot-based diagnostics are envisioned.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2024
·Vol. 25
·期 11
·5971
·
IF 4.9
Yan-Xin Guo,Xin-Ran Guo,Xin-Yue Chen
A dual-emission ratio-fluorescent sensing nanohybrid based on RadixHedysarigreen-synthesized carbon quantum dots (CDs) and glutathione-functionalized gold nanoclusters (GSH-AuNCs) had been developed for the determination of cefodizime sodium (CDZM). The designed fluorescence nanohybrid had two significant fluorescence emission peaks at 458 nm and 569 nm when excited at 360 nm, which was attributed to the CDs and GSH-AuNCs. With the addition of CDZM, the fluorescence at 458 nm was slightly weakened while the fluorescence at 569 nm was enhanced obviously. Based on the relationship between the I569/I458fluorescence intensity ratio and the concentration of CDZM, the designed nanohybrid exhibited a good linearity range of 1.0–1000.0 μM and the limit of detection (LOD) was 0.19 μM. The method was finally applied in the detection of CDZM in urine, showing the potential applications in complicated biological samples.
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Small
·
2024
·
IF 13
Aizhu Chen,Xuhui Yang,Lijuan Shen,Ying Zheng,Min-Quan Yang
Loading cocatalysts onto semiconductors is one of the most popular strategies to inhibit charge recombination, but the efficiency is generally hindered by the localized built-in electric field and the weakly connected interface. Here, this work designs and synthesizes a 1D P-doped CdS nanowire/Ni 2 P heterojunction with gradient doped P to address the challenges. In the composite, the gradient P doping not only creates a funneled bandgap structure with a built-in electric field oriented from the bulk of P-CdS to the surface, but also facilitates the formation of a tightly connected interface using the co-shared P element. Consequently, the photogenerated charge carriers are enabled to be pumped from inside to surface of the P-CdS and then smoothly across the interface to the Ni 2 P. The as-obtained P-CdS/Ni 2 P displays high visible-light-driven H 2 evolution rate of ≈8265 µmol g −1 h −1 , which is 336 times and 120 times as that of CdS and P-CdS, respectively. This work is anticipated to inspire more research attention for designing new gradient-doped semiconductor/cocatalyst heterojunction photocatalysts with bridged interface for efficient solar energy conversion.
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Materials Today Chemistry
·
2024
·
IF 6.7
Jian Gou,Yousong Hu,Luxin Xing,Jun Xu,Fengzhi Yue,Lina Zhang,Lei Jia
Traditional luminescent materials for anti-counterfeiting usually adopt encryption of low-level systems with limited security, which seriously hinders their application in preventing counterfeiting and information leakage. Therefore, it is urgent to develop materials for higher-level anti-counterfeiting. In this work, a stimulus-responsive intelligent luminescent material (AC@CDs-Eu-MOFs) was prepared by co-loading green-fluorescence CDs and red-fluorescence Eu-MOFs on Amino clay (AC). 5D security barcodes, which were easy to observe while difficult to clone, were ulteriorly designed based on the nanocomposite owing to the tunable fluorescence by optical stimulation and chemical stimulus. Owing to the large capacity, low cost, and easy authentication, the 5D security barcodes possess enormous potential in optical data storage and multi-dimensional information encryption. In addition, the chemical stimulus-response enables the nanocomposite achievable in detection of Cu 2+ and Bacillus anthracis. Particularly, quantitative determination of copper in environmental water samples could be realized with a detection limit as low as 10.67 nM. Therefore, the material shows potential for detection of environmental pollutants besides advanced anti-counterfeiting.
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TALANTA
·
2025
·
IF 6.1
Shihao Duan,Haipeng Zhang,Zhaopeng Liu,Jian Li,Liming Gao,Hong Jiang,Jidong Wang
Herein, a novel dual-mode biosensor integrating photoelectrochemical (PEC) and fluorescence (FL) sensing detection was developed for circulating tumor cells (CTCs) based on aptamer DNA-linked CdTe QDs (Apt-CdTe QDs)/Bi 2 MoO 6 /CdS “dual Z-scheme” sensing system. Apt-CdTe QDs were assembled on FTO/CdS/Bi 2 MoO 6 /cDNA electrode through hybridization with cDNA, resulting in the formation of a double Z-scheme CdS/Bi 2 MoO 6 /CdTe heterostructure that significantly enhanced the separation of photo-generated charge carriers, thereby improving photocatalytic efficiency. Upon the presence of MCF-7 cells, Apt-QDs were captured and subsequently released from the captured electrode, leading to a decrease in photocurrent and an increase in fluorescence intensity, thus enabling effective PEC-FL dual-mode detection. The detection of CTCs exhibited a linear relationship within the concentration range from 50 to 100000 cells mL −1 with limit of detection of 1 cell mL −1 in both PEC and FL modes. This approach effectively corrected systematic errors, improved detection accuracy and sensitivity, and held great potential in the clinical detection of CTCs.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Qi Li,Shengchao Yang,Yufan Huang,Yuwei Liang,Chunling Hu,Min Wang,Zhiyong Liu,Yanlong Tai,Jichang Liu,Yongsheng Li
The difficulty in fabricating a multifaceted composite heterojunction system based on Cd x Zn 1- x S limits the enhancement of photocatalytic performance. In the present scrutiny, novel ZnO/Cd x Zn 1- x S/CdS composite heterojunctions are successfully prepared by the alkaline dissolution etching method. The internal electric field at the interface of I-type and Z-scheme heterojunction improved the effective charge separation. The ZC 8 sample exhibits excellent photocatalytic performance and the H 2 production efficiency is 15.67 mmol g −1 h −1 with good stability up to 82.9 % in 24-hour cycles. The performance of CH 4 and CO capacity in the CO 2 RR process is 3.47 μmol g −1 h −1 and 23.5 μmol g −1 h −1 , respectively. The photogenerated accelerated charge transport is then examined in detail by in situ X-ray photoelectron spectroscopy (ISXPS) and density functional theory (DFT) calculations. This work presents a new idea for the synthesis of Cd x Zn 1- x S solid-solution-based materials and provides a solid reference for the detailed mechanism regarding the electric field at the heterojunction interface.
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CARBON
·
2025
·
IF 11.6
Ying Gao,Tongxin Sun,Taotao Wu,Jiayu Xu,Yuefeng Zhu,Jinge Hu,Haiping Yang,Hui Xu,Yibao Kan,Lei Zhao
This study utilizes nitrogen-rich biomass, soybean meal, as a raw material to synthesize carbon dots (CDs) based dual-mode afterglow emission materials via microwave-assisted hydrothermal treatment (reaction temperature:180–220 °C, residence time: 15–60 min) through nitrogen-boron co-doping strategy. Boric acid was used as an acidic proton source to investigate the microwave-assisted hydrolysis of soymeal under varying temperatures and reaction times. The distribution and types of major organic compounds in the hydrothermal liquid phase were analyzed, and the formation of B–C covalent bonds in the hydrothermal system was induced. Under optimal reaction conditions, boron-doped carbon dots (S-BCDs) with a glassy structure were successfully synthesized, and melamine-doped carbon dots (S-BCDs@MA) were also prepared. The fluorescence properties and structural changes of S-BCDs and S-BCDs@MA were compared and analyzed under different reaction conditions, exploring the effect of nitrogen-boron co-doping on the transition from fluorescence to phosphorescence in S-BCDs@MA. To research the dual-mode afterglow emission mechanism in room temperature phosphorescence (RTP) and thermally activated delayed fluorescence (TADF) of S-BCDs@MA under different reaction temperatures and residence times, and to obtain the optimal afterglow performance of S-BCDs@MA through the analyses of fluorescence spectra, afterglow spectra, and also time-resolved spectra. The biomass-carbon dots were applied in the field of information encryption.
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Catalysis Science & Technology
·
2021
·Vol. 11
·期 16
·5579-5589
·
IF 6.119
Qixiao Gai,Shoutian Ren,Xiaochun Zheng,Wenjun Liu,Quanli Dong
Transition metal co-catalysts exhibit considerable potential in the photocatalytic water splitting process, but their limited activity and poor stability inhibit their extensive application, and therefore effective schemes are required to further enhance their co-catalytic performance. In this article, 2D/2D C3N4/CdS heterogeneous photocatalysts are first synthesized, and then CoNi alloyed NPs are selectively loaded on their CdS nanosheets by a convenient photodeposition method. The CoNi loading amount and Co/Ni ratio are adjusted by the photodeposition time and precursor Co2+/Ni2+ ratio, respectively. Meanwhile, Co–S bonds are formed between CdS and CoNi NPs. Their optimal hydrogen evolution rate can reach up to 2936.65 μmol g−1 h−1, which is higher than that of C3N4/CdS with Co, Ni or Pt as co-catalysts (i.e. 844.59, 2385.96 and 2486.66 μmol g−1 h−1), respectively. The enhanced photocatalytic performance should be due to the following three points: (1) the formation of the 2D/2D C3N4/CdS heterojunction; (2) the optimized Gibbs free energy of the CoNi co-catalysts; (3) the formation of Co–S bonds between CoNi and CdS. Our work provides a cost-effective scheme to exploit stable and efficient photocatalysts.
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