11 research outputs found
Morphology Adjustment and Optimization of CuS as Enzyme Mimics for the High Efficient Colorimetric Determination of Cr(VI) in Water
Metal sulfide is often utilized as a catalyzed material to form colorimetric response system for some heavy metal detection. While the aggregation effect and conventional morphology limited the catalyzed efficiency. Herein, a robust method based on morphology adjustment was proposed to improve the dispersibility and catalytic performance of CuS. The results demonstrated when the solvent ratio of ethylene glycol and dimethyl sulfoxide arrived at 3:1, it displayed an optimal structure which is like a patulous flower. Meanwhile, an optimal surface binding energy (ΔE) of 120.1 kcal/mol was obtained via theoretical calculation model. The flower-like structure caused a 2-fold increase in the catalytic level. Subsequently, the CuS was employed to make colorimetric detection of Cr(VI) in water. The assay results exhibited a linear range of the Cr(VI) from 60 to 340 nM, the limit of detection was 1.07 nM. In the practical tests for Qianhu lake water, the spiked recoveries were 93.6% and 104% with the RSD of 4.71% and 3.08%. Therefore, this CuS-based colorimetric method possesses a satisfactory application prospect for the Cr(VI) determination in water
Morphology Adjustment and Optimization of CuS as Enzyme Mimics for the High Efficient Colorimetric Determination of Cr(VI) in Water
Metal sulfide is often utilized as a catalyzed material to form colorimetric response system for some heavy metal detection. While the aggregation effect and conventional morphology limited the catalyzed efficiency. Herein, a robust method based on morphology adjustment was proposed to improve the dispersibility and catalytic performance of CuS. The results demonstrated when the solvent ratio of ethylene glycol and dimethyl sulfoxide arrived at 3:1, it displayed an optimal structure which is like a patulous flower. Meanwhile, an optimal surface binding energy (ΔE) of 120.1 kcal/mol was obtained via theoretical calculation model. The flower-like structure caused a 2-fold increase in the catalytic level. Subsequently, the CuS was employed to make colorimetric detection of Cr(VI) in water. The assay results exhibited a linear range of the Cr(VI) from 60 to 340 nM, the limit of detection was 1.07 nM. In the practical tests for Qianhu lake water, the spiked recoveries were 93.6% and 104% with the RSD of 4.71% and 3.08%. Therefore, this CuS-based colorimetric method possesses a satisfactory application prospect for the Cr(VI) determination in water
Dual Application: p-CuS/n-ZnS Nanocomposite Construction for High-Efficiency Colorimetric Determination and Photocatalytic Degradation of Tetracycline in Water
Herein, CuS was incorporated with ZnS to form a novel nanocomposite via cation exchange, and the product was then employed for dual application of the colorimetric determination and photocatalytic degradation of tetracycline (TC) in water. The formed p–n heterojunction provided an improved gap width and electron mobility, which could rapidly catalyze H2O2 to produce plenty of •OH, supporting a color conversion with TMB. Meanwhile, the addition of TC could lead to the further enhancement in colorimetric signal, and the distinction level was sensitive to the target amount. Additionally, under light conditions, the p-CuS/n-ZnS could produce •O2−, •OH, and h+ through photocatalysis, and these ions could degrade the TC via oxidation. In the colorimetric determination of TC, the signal responses were obtained within 10 min, and the detection limit was 20.94 nM. The recovery rates were 99% and 106% for the water samples from Ganjiang river. In the photocatalytic degradation, the TC was degraded by 91% within 120 min, which was threefold that of ZnS. Meanwhile, the morphology feature of the p-CuS/n-ZnS remained after multiple uses, suggesting a favorable material stability. This strategy provides application prospects for the monitoring and control of antibiotics in water
Scanning Electrochemical Microscopy in Combination with Piezoelectric Quartz Crystal Impedance Analysis for Studying the Growth and Electrochemistry as Well as Microetching of Poly( o
In-situ Growth of NiCo Layered Double Hydroxide Nanocages on Co Foams as Efficient Electrocatalysts for Water Splitting: A Rational Design Approach
No description supplie
Dual-Readout Immunochromatographic Assay by Utilizing MnO<sub>2</sub> Nanoflowers as the Unique Colorimetric/Chemiluminescent Probe
Manganese
dioxide nanoflowers (MnO<sub>2</sub> NFs) were synthesized
and used as a dual readout probe to develop a novel immunochromatographic
test strip (ITS) for detecting pesticide residues using chlorpyrifos
as the model analyte. MnO<sub>2</sub> NFs-labeled antibody for chlorpyrifos
was employed as the signal tracer for conducting the ITS. After 10
min competitive immunoreaction, the tracer antibody was captured by
the immobilized immunogen in the test strip, resulting in the captured
MnO<sub>2</sub> NFs on test line. The captured MnO<sub>2</sub> NFs
led to the appearance of brown color on the test line, which could
be easily observed by the naked eye as a qualitative readout. Due
to the very slight colorimetric difference of chlorpyrifos at trace
concentrations, the semiquantitative readout by naked eyes could not
meet the demand of quantitative analysis. MnO<sub>2</sub> NFs showed
a significant effect on the luminol–H<sub>2</sub>O<sub>2</sub> chemiluminescent (CL) system, and the CL signal driven by MnO<sub>2</sub> NFs were used to detect the trace concentration of chlorpyrifos
quantitatively. 1,3-Diphenylisobenzofuran quenching studies and TMB–H<sub>2</sub>O<sub>2</sub> coloration assays were conducted for studying
the enhancing mechanism of MnO<sub>2</sub> NFs, which was based on
the oxidant activity to decompose H<sub>2</sub>O<sub>2</sub> for forming
reactive oxygen species. Under optimal conditions, the linear range
of chlorpyrifos was 0.1–50 ng/mL with a low detection limit
of 0.033 ng/mL (S/N = 3). The reliability of the dual-readout ITS
was successfully demonstrated by the application on traditional Chinese
medicine and environmental water samples. Due to the simultaneous
rapid-qualitative and sensitive-quantitative detection, the dual-readout
protocol provides a promising strategy for rapid screening and field
assay on various areas such as environmental monitoring and food safety