MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 2
·1-9
·
IF 6.232
Xiang Ling,Zhang Feng,Feng Jian,Chen Chunyan,Cai Changqun
A method is described for the simultaneous determination of hepatocellular carcinoma-associated microRNA-122 and microRNA-199a/b-3p. This probe consists of two kinds of nanomaterials. The first comprises CdTe@CdS core-shell quantum dots which, on excitation at 375 nm give two emissions, with peak wavelengths at 543 (g-QDs) and at 627 nm (r-QDs). The second comprises gold nanoparticles acting as a quencher. In the absence of the target, g-QD-N1 and r-QD-N2 are stable due to the fluorescence stability. With the addition of microRNA-122 and microRNA-199a/b-3p, g-QD-N1 and r-QD-N2 are conjugated to the surface of AuNP-S1/S2 through base complementary pairing. As a result, fluorescence resonance energy transfer (FRET) occurs, resulting in a decrease at 550 nm and 635 nm respectively, which can realize the simultaneous detection of two different microRNAs. Detection is achieved within 50 min. The detection limits (3σ/k) are 0.2 nM for microRNA-122 and 0.5 nM for microRNA-199a/b-3p. The clinical applicability of the assay was demonstrated by detecting microRNAs in human serum and different cell lysates.
Schematic for the simultaneous determination of microRNA-122 and microRNA-199a/b-3p by FRET.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yongtao Xue,Zengyue Chen,Zhansheng Wu,Fei Tian,Bing Yu
Developing cost-effective photocatalysts with efficient electron hole separation efficiency and excellent light absorption performance for the remediation of organic pollutants from wastewater is highly desirable. Herein, a new Z-Scheme Bi/BiVO 4 -CdS heterojunction with leaf-like morphology has been successfully fabricated for the first time and its application as a photocatalyst for the degradation of tetracycline hydrochloride (TCH) has been explored. Compared with BiVO 4 and Bi/BiVO 4 , the as-prepared Bi/BiVO 4 -CdS exhibits improved light absorption capacity and electron-hole separation efficiency, and it has a superior performance of photocatalytic degradation of TCH. The degradation ratio of TCH by Bi/BiVO 4 -CdS based photocatalysis reaches 85.5% within 30 min. The rate constant of TCH degradation for Bi/BiVO 4 -CdS is 1.32 and 1.18 times of the BiVO 4 and Bi/BiVO 4 , respectively. In addition, Bi/BiVO 4 -CdS displays a high stability without obvious decay for its TCH degradation efficiency (<5%) during four recycles. The ESR characterization and reactive species trapping experiments indicates that the generated h + , •O 2 – , and •OH from Bi/BiVO 4 -CdS based photocatalysis are responsible for TCH degradation. Since several intermediates are identified by HPLC-MS, the pathways for Bi/BiVO 4 -CdS based photocatalytic degradation of TCH are proposed.
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ENVIRONMENTAL TECHNOLOGY
·
2021
·
IF 3.247
Jingling Wang,Wensong Lin,Manru Dong,Yue Xing,Qicheng Zhang
In this work, the CdS quantum dots (QDs) decorated Bi2MoO6/Bi2Mo3O12 (BMO) heterojunction photocatalyst (C/BMO) has been successfully synthesized using a facile two-step hydrothermal method. The as-prepared photocatalysts were characterized by XRD, FTIR, XPS, FESEM, TEM, UV-vis DRS, PL and photoelectrochemical measurements to investigate the effects of CdS(QDs) and BMO heterojunction on the structure, morphology, optical and charge carrier transmission characteristics of the photocatalysts. Narrow band gap and superior catalytic activities were found in C/BMO as compared with pure BMO. Moreover, the C/BMO photocatalyst containing twice CdS content (2-C/BMO) exhibits even higher photocatalytic activity and stability. After exposure to visible light for 30 min, the degradation rate of Rhodamine B (RhB), Methylene blue (MB) and Ofloxacin (OFX) by 2-C/BMO reached 95%, 92% and 76%, respectively. Radicals scavenging experiments and electron spin-resonance spectroscopy (ESR) investigations indicated that the superoxide radical anions (∙O2− ), hole (h+) and hydroxyl radicals (•OH) are the dominating active species in the photodegradation processes. ∙O2− and h+ are the key factors in the degradation of RhB and OFX solutions, and •OH is the major determinant in removal of MB. The process and photocatalytic mechanism on 2-C/BMO was discussed. Well absorption of visible light, effective separation of photoelectron-hole pairs and the transportation of photogenerated carriers at the interfaces of ternary semiconductor heterojunction are suggested as the key factors to enhance the photocatalytic performance of the photocatalysts.
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ANALYST
·
2019
·Vol. 145
·期 2
·619-625
·
IF 4.019
Nuo Zhang,Yaoguang Wang,Guanhui Zhao,Chao Wang,Yueyuan Li,Yong Zhang,Huan Wang,Qin Wei
An ultrasensitive label-free photoelectrochemical (PEC) immunosensor was developed to detect amyloid β-protein (Aβ) based on CdS/CdTe-cosensitized SnO2 nanoflowers. Specifically, SnO2 with a flower-like porous nanostructure was utilized as a perfect substrate for the construction of PEC immunosensors, and the SnO2-modified electrode was first coated with CdTe quantum dots (QDs) and then further deposited with CdS by successive ionic layer adsorption and reaction techniques. The formed SnO2/CdS/CdTe-cosensitized structure exhibited excellent photocurrent intensity and was employed as an excellent photoactive matrix to immobilize Aβ antibody to further construct the immunosensor. Under optimal conditions, the as-constructed PEC immunosensor was used to detect Aβ and exhibited a wide linear concentration range from 0.5 pg mL−1 to 10 ng mL−1, with a low limit of detection (LOD, 0.18 pg mL−1, S/N = 3). Meanwhile, it also presented good reproducibility, specificity, and stability and may open a new promising platform for the clinical detection of Aβ or other biomarkers.
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JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Renshan Wang,Ganhua Qiu,Yi Xiao,Xueqin Tao,Wen Peng,Benxia Li
In this work, an all-solid-state Z-scheme photocatalyst of WO 3 ·H 2 O/Pd/CdS ternary heterostructures was constructed by introducing a small amount of Pd into the optimized WO 3 ·H 2 O/CdS binary system, where Pd nanoparticles (NPs) were sandwiched between WO 3 ·H 2 O nanosheets and CdS NPs. The WO 3 ·H 2 O/Pd/CdS ternary heterostructures exhibited remarkably enhanced photocatalysis towards the oxidative coupling of benzylamines to imines, compared with the other photocatalysts of WO 3 ·H 2 O, CdS, WO 3 ·H 2 O/CdS, WO 3 ·H 2 O/Pd, and WO 3 ·H 2 O/CdS/Pd. The wavelength-dependent photocatalysis of WO 3 ·H 2 O/Pd/CdS is in good agreement with its light-harvesting intensity at the corresponding wavelengths. The photoelectrochemical results reflected the enhanced charge carrier separation in WO 3 ·H 2 O/Pd/CdS, and the photocatalytic H 2 evolution confirmed the highly efficient Z-scheme charge transfer in this ternary photocatalyst. Therefore, the WO 3 ·H 2 O/Pd/CdS ternary heterostructures possess distinct advantages of extended light harvesting region, spatial separation of electron and holes, and elevated redox power, which synergistically contribute to the superior photocatalysis. The Pd NPs sandwiched between WO 3 ·H 2 O and CdS acted as not only an electron mediator to facilitate the interfacial charge separation but also a cocatalyst to accelerate the selective oxidation of benzylamine. This work demonstrates a rational design of highly efficient Z-scheme photocatalysts and presents some revelations about the photocatalytic mechanism for selective organic transformations.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 16
·14954-14966
·
IF 2.195
Fang Hongjun,Pan Yusong,Yin Minyuan,Pan Chengling
Active co-catalysts have been extensively used for improving photocatalytic activity in semiconductor-based photocatalytic systems. Herein, 2D alkalized Ti 3 C 2 (Ti 3 C 2 -OH) nano-sheets were coupled with CdS via a facile electrostatic self-assembly strategy and combined with hydrothermal method to prepare Ti 3 C 2 -OH/CdS photocatalyst. The morphologies, crystal phases, optical and photoelectrical properties of the prepared photocatalysts were characterized by XRD, SEM, TEM, FTIR, PL, and EIS analysis, respectively. The photocatalytic degradation results verified that the photo-degradation performance of Ti 3 C 2 -OH/CdS photocatalyst (degradation of 97% RhB in 100 min) was obviously superior to that of pure CdS (degradation of 70% RhB in 100 min) and Ti 3 C 2 /CdS (degradation of 82% RhB in 100 min). The active species trapping experiments for Ti 3 C 2 -OH/CdS photocatalyst revealed that the superoxide radical ( · O 2 − ) and holes (h + ) were the predominant species for degradation of RhB. Furthermore, the Ti 3 C 2 -OH co-catalyst in the Ti 3 C 2 -OH/CdS composite not only played the role of promoting the effective separation of photo-generated electron–hole pairs, but also constructing strong connections with CdS semiconductor to establish heterostructure, ultimately enhancing the photocatalytic performance of the Ti 3 C 2 -OH/CdS photocatalyst.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Qinghua Deng,Tifang Miao,Ziqun Wang,Yun Xu,Xianliang Fu
Compositional regulation and modification of CdS are effective strategies to enhance its photocatalytic activity and stability. Herein, a series of MoS 2 modified Co 0.2 Cd 0.8 S nanorods (CCS) was synthesized by a hydrothermal method and used for photocatalytic hydrogen evolution reaction (HER) under visible light irradiation. The results indicated that the HER activity and stability of CdS could be substantially improved by the introduction of Co 2+ into CdS lattice, which can accelerate the separation of photoinduced charge carriers and avoid the formation of high oxidation power holes (h + ) due to the upward shift of the valence band edge. The HER performance of CCS could be further enhanced by the decoration of MoS 2 nanosheets. CCS loaded with 5% MoS 2 (wt%) showed the highest activity (2835.6 μmol·g −1 ·h −1 ), which is about 8.9 and 1.6 times higher than that of CdS and CCS. The type II heterojunction formed between CCS and the intimately contacted MoS 2 accounts for the improvement as MoS 2 can serve as trapping centers for photoinduced electrons (e − ) and active sites for HER. This work demonstrated that the activity and the stability of CdS for photocatalytic HER could be boosted by a consolidation of CoS with the host CdS to form a solid solution and a further decoration with low-cost MoS 2 cocatalyst.
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Russian Journal of Physical Chemistry A
·
2018
·Vol. 92
·期 6
·1224-1228
·
IF 0.549
Sun Yunfei,Liu Chunling,Yang Lili,Wei Maobin,Lv Shiquan,Sui Yingrui,Cao Jian,Chen Gang,Yang Jinghai
ZnO NRAs are grown on ITO substrates by a simple chemical method. CdS QDs were deposited on ZnO NRAs by SILAR. N719 was synthesized by dipping method. J–V analysis indicates that by inserting a layer of CdS QDs, the conversion efficiency of DSSCs was improved obviously. The device with CdS QDs shows the higher conversion efficiency due to the three reasons: (1) CdS QDs enhanced adsorption spectra of DSSCs in the visible region; (2) CdS QDs block the formation of Zn 2+ /dye complex, it is beneficial for electros transport from dye to ZnO photoanode. It is the key to obtain higher conversion efficiency; (3) FRET dynamics exists by the introduction of CdS QDs.
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DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 36
·12671-12683
·
IF 4.099
Sugang Meng,Yanjuan Cui,Hao Wang,Xiuzhen Zheng,Xianliang Fu,Shifu Chen
The development of stable noble metal-free photocatalysts with efficient separation and transportation of the photogenerated electrons–holes is of crucial importance for promoting the application of photocatalysis technology. Herein, we propose an electron transfer strategy by reasonable design and fabrication of novel 0D NiSx nanosheets as a co-catalyst on the surface of 1D CdS nanorods (CdS-NRs) to enhance photocatalytic hydrogen evaluation and contamination (Cr(VI), rhodamine B and bisphenol A) removal in water. Under visible light irradiation, the 0D–1D NiSx/CdS-NR nanocomposite with 1.5% NiSx loading gave a hydrogen evolution rate of 5.98 mmol h−1 g−1, which is about 5.3 times and 1.9 times higher than that of the native CdS-NRs and the optimal 1% Pt/CdS-NRs, respectively. Notably, good stability in the recycling test and a high apparent quantum efficiency of about 69.9% at 420 nm were also obtained. The 1.5% NiSx/CdS-NRs exhibited enhanced photocatalytic contamination degradation efficiency of about 2 times higher than pure CdS-NRs. In this hybrid photocatalyst, 0D NiSx nanosheets came into intimate interfacial contact with the surface of 1D CdS-NRs and played a similar role as noble metals, which could effectively improve the separation, transportation efficiencies and lifetime of photogenerated charge, and thus enhance the photocatalytic performance of CdS-NRs with more efficient conversion of solar energy. This work shows not only a possibility for the utilization of noble metal-free NiSx as a co-catalyst in the photocatalysis, but also provides new insight into the design and fabrication of high-performance composite photocatalysts (such as NiSx/g-C3N4 and NiSx/Zn3In2S6).
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RSC Advances
·
2018
·Vol. 8
·期 72
·41432-41438
·
IF 2.936
Min Chen,Wen Wu,Yuyuan Chen,Qingqing Pan,Yongzhong Chen,Zongfu Zheng,Yanjie Zheng,Liying Huang,Shaohuang Weng
Blue luminescent nitrogen-doped carbon nanodots (N-CDs) with pH-dependent properties were prepared from citric acid (CA), glutathione (GSH), and polyethylene polyamine (PEPA) using a two-step pyrolytic route. The N-CDs showed stable and strong emission bands at approximately 455 nm under 350 nm excitation. Moreover, the fluorescence of N-CDs can be gradually decreased by gradually increasing the pH value. A good linear relationship between the fluorescence intensity of N-CDs and the pH range of 3.0–9.0 was obtained. Thus, the response mechanism of N-CDs to pH was systematically investigated. N-CDs possessed –NH2, –COOH, and –CONH– as active functional groups, which allowed the variable protonation/deprotonation of N-CDs to regulate the fluorescence emission intensities under changed pH values. Furthermore, upon combining urease-catalyzed hydrolysis of urea with increased pH values, a simple but effective fluorescence assay for urea was developed. The analytical performance for urea detection was the linear range of 0 to 10 mM with a detection limit of 0.072 mM. Additionally, the fluorescent sensor based on N-CDs was successfully applied for pH detection in synovial fluid and urea determination in serum.
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NANOTECHNOLOGY
·
2013
·Vol. 24
·期 20
·205601
·
IF 3.842
Bin Xu,Bing Cai,Ming Liu,Hongsong Fan
This study explored a simple and fast method utilizing ultraviolet (UV) irradiation to synthesize CdTe/CdS/ZnS QDs in aqueous solution. Based on the reaction of photolysis and chemical deposition, the CdS and ZnS shell can be successively deposited around the thiol-capped CdTe cores through the interaction of Cd2+/Zn2+ and S2− produced by UV irradiation. The effect of the UV irradiation time, the ratios of thioglycolic acid (TGA)/Cd and TGA/Zn on the shell formation, shell stability, and the photoluminescence (PL) intensity of the QDs, was systematically investigated. Keeping the ratio of TGA/Cd, increasing UV irradiation time from 30 to 120 s, the blue-shift of the fluorescence emission peak position of CdTe/CdS QDs was observed. As the irradiation time increased continuously from 120 to 300 s, the red-shift of the emission peak position was observed. In the total irradiation time, the PL intensity of all the samples was enhanced. By applying 300 s irradiation on the samples, the emission peak was blue-shifted at a fixed TGA/Cd ratio of 1:1 and red-shifted at the ratios of 2:1, 4:1, 8:1, and 13:1. The PL intensity reached its highest value at the ratio of 2:1. The effect of TGA/Zn ratio on ZnS shell formation showed a similar progress. Under an optimum synthesized reaction condition, the particle sizes of CdTe core, CdTe/CdS core–shell and CdTe/CdS/ZnS core–shell–shell QDs were 2.6 nm, 3.4 nm, and 4.6 nm respectively. This study confirmed that with the core–shell–shell structure, CdTe/CdS/ZnS QDs had high anti-oxidability, photostability, and low toxicity. Therefore they can be further used in cell imaging efficiently.
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RSC Advances
·
2015
·Vol. 5
·期 116
·95744-95749
·
IF 3.84
Jiangling He,Bingfu Lei,Haoran Zhang,Mingtao Zheng,Hanwu Dong,Jianle Zhuang,Yong Xiao,Yingliang Liu
A facile and green approach for preparation of photoluminescent nitrogen-doped carbon dots (N-CDs) is reported, using cheap and extensively available cocoon silk as raw material. The use of H2O2 leads to the enhanced formation of N-CDs. The N-CDs have been synthesized in a short time (50 minutes), and have a high fluorescence quantum yield (24.0%). A small amount of H2O2 solution plays a vital role in shortening the reaction time, which is a brand new way to synthesize N-CDs with the help of H2O2, with both reactants and products being environmentally friendly. The prepared N-CDs are collected by removing the insoluble materials through simple filtration rather than dialysis. As far as we know, this is the first report of N-CDs being synthesized simply with the help of H2O2 solution. The prepared N-CDs solution is sensitive to pH changes, which means they have promise for application in the pH detection area.
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