Highly Selective and Sensitive Recognition of Cobalt(II) Ions Directly in Aqueous Solution Using Carboxyl-Functionalized CdS Quantum Dots as a Naked Eye Colorimetric Probe: Applications to Environmental Analysis

2012 ◽  
Vol 4 (10) ◽  
pp. 5217-5226 ◽  
Author(s):  
Anil H. Gore ◽  
Dattatray B. Gunjal ◽  
Mangesh R. Kokate ◽  
Vasanthakumaran Sudarsan ◽  
Prashant V. Anbhule ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Environmental Analysis ◽  
Cds Quantum Dots ◽  
Colorimetric Probe ◽  
Naked Eye

scholarly journals Citric Acid Capped CdS Quantum Dots for Fluorescence Detection of Copper Ions (II) in Aqueous Solution

Nanomaterials ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 32 ◽  
Author(s):  
Zhezhe Wang ◽  
Xuechun Xiao ◽  
Tong Zou ◽  
Yue Yang ◽  
Xinxin Xing ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Citric Acid ◽  
Limit Of Detection ◽  
Copper Ions ◽  
High Sensitivity ◽  
Fluorescence Sensor ◽  
Cds Quantum Dots ◽  
Detection Range ◽  
Cds Qds

Citric acid capped CdS quantum dots (CA-CdS QDs), a new assembled fluorescent probe for copper ions (Cu2+), was synthesized successfully by a simple hydrothermal method. In this work, the fluorescence sensor for the detection of heavy and transition metal (HTM) ions has been extensively studied in aqueous solution. The results of the present study indicate that the obtained CA-CdS QDs could detect Cu2+ with high sensitivity and selectivity. It found that the existence of Cu2+ has a significant fluorescence quenching with a large red shifted (from greenish-yellow to yellowish-orange), but not in the presence of 17 other HTM ions. As a result, Cu2S, the energy level below the CdS conduction band, could be formed at the surface of the CA-CdS QDs and leads to the quenching of fluorescence of CA-CdS QDs. Under optimal conditions, the copper ions detection range using the synthesized fluorescence sensor was 1.0 × 10‒8 M to 5.0 × 10‒5 M and the limit of detection (LOD) is 9.2 × 10‒9 M. Besides, the as-synthesized CA-CdS QDs sensor exhibited good selectivity toward Cu2+ relative to other common metal ions. Thus, the CA-CdS QDs has potential applications for detecting Cu2+ in real water samples.

CdS Quantum Dots Sensitized TiO2 Nanotubes Photocatalytic Degradation of Dimethyl Phthalate under Sunlight Irradiation

2013 ◽  
Vol 726-731 ◽  
pp. 602-605 ◽  
Author(s):  
Xiao Hua Bai ◽  
Shi Chang Wang ◽  
Chang Qing Wang ◽  
Xin You Lei ◽  
Guo Fang Zuo ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Dimethyl Phthalate ◽  
Cds Quantum Dots ◽  
Sunlight Irradiation ◽  
Initial Concentration ◽  
Degradation Rates ◽  
Vis Spectroscopy ◽  
Catalyst Dosage ◽  
Cbd Method

The CdS quantum dots sensitized TiO2 nanotubes were prepared by sequential chemical bath deposition (S-CBD) method and characterized by FE-SEM and UV-vis spectroscopy. And they were used to degrade the dimethyl phthalate (DMP) in aqueous under sunlight irradiation. The results show that these photo-catalysts have the highest performance, while the initial concentration of dimethyl phthalate in aqueous solution is 10 mg / L, the degradation rates reaches above 80% in the optimum condition which is the CdS deposited 20 cycles, catalyst dosage ~3cm2, and the sunlight irradiating 180 minutes.

Procedures for Controlling the Size, Structure and Optical Properties of CdS Quantum Dots during Synthesis in Aqueous Solution

2011 ◽  
Vol 22 (1) ◽  
pp. 59-69 ◽  
Author(s):  
María-Jesús Almendral-Parra ◽  
Ángel Alonso-Mateos ◽  
Sara Sánchez-Paradinas ◽  
Juán F. Boyero-Benito ◽  
Emilio Rodríguez-Fernández ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Optical Properties ◽  
Size Structure ◽  
Cds Quantum Dots
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