scholarly journals Synthesis of poly (N-isopropylacrylamide)-co-(acrylic acid) microgel-entrapped CdS quantum dots and their photocatalytic degradation of an organic dye

RSC Advances ◽  
2018 ◽  
Vol 8 (30) ◽  
pp. 16850-16857 ◽  
Author(s):  
Jingzhu Liu ◽  
Tong Shu ◽  
Lei Su ◽  
Xueji Zhang ◽  
Michael J. Serpe
Keyword(s):  
Quantum Dots ◽  
Acrylic Acid ◽  
Photocatalytic Degradation ◽  
Network Structure ◽  
Rhodamine B ◽  
Organic Dyes ◽  
Organic Dye ◽  
Cds Quantum Dots

CdS quantum dots (CdSQDs) were generated inside the network structure of poly (N-isopropylacrylamide)-co-(acrylic acid) (pNIPAm-co-AAc) microgels and their ability to photocatalytically degrade organic dyes was evaluated using rhodamine B (RhB).

scholarly journals Photocatalytic Degradation of Single and Binary Mixture of Brilliant Green and Rhodamine B Dyes by Zinc Sulfide Quantum Dots

Molecules ◽  
2021 ◽  
Vol 26 (24) ◽  
pp. 7686
Author(s):  
Peter A. Ajibade ◽  
Abimbola E. Oluwalana
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Brilliant Green ◽  
Organic Dyes ◽  
Degradation Efficiency ◽  
Photoluminescence Intensity ◽  
X Ray Diffraction ◽  
Tauc Plot ◽  
Diffraction Patterns

We present the preparation of octadecylamine-capped ZnS quantum dots from bis(morpholinyldithiocarbamato)Zn(II) complex. The complex was thermolyzed at 130 °C in octadecylamine at different times, to study the effect of reaction time on the morphological and photocatalytic properties of the ZnS quantum dots. Powder X-ray diffraction patterns confirmed a hexagonal wurtzite crystalline phase of ZnS, while HRTEM images showed particle sizes of about 1–3 nm, and energy band gaps of 3.68 eV (ZnS–1), 3.87 eV (ZnS–2), and 4.16 eV (ZnS–3) were obtained from the Tauc plot for the ZnS nanoparticles. The as-prepared ZnS were used as photocatalysts for the degradation of brilliant green, rhodamine B, and binary dye consisting of a mixture of brilliant green-rhodamine B. The highest photocatalytic degradation efficiency of 94% was obtained from ZnS–3 with low photoluminescence intensity. The effect of catalytic dosage and pH of the dyes solution on the photocatalytic process shows that pH 8 is optimal for the degradation of brilliant green, while pH 6.5 is the best for photocatalytic degradation of rhodamine B. The degradation of the binary dyes followed the same trends. The effect of catalytic dosage shows that 1 mg mL−1 of the ZnS nano-photocatalyst is the optimum dosage for the degradation of organic dyes. Reusability studies show that the ZnS quantum dots can be reused five times without a significant reduction in degradation efficiency.

Enhanced photocatalytic degradation of Rhodamine B, antibacterial and antioxidant activities of green synthesised ZnO/N doped carbon quantum dots nanocomposites

2021 ◽  
Author(s):  
Aschalew Tadesse ◽  
Mebrahtu Hagos Kahsay ◽  
Neway Belachew ◽  
H C Ananda Murthy ◽  
Basavaiah Keloth
Keyword(s):  
Quantum Dots ◽  
Zinc Oxide ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Environmental Remediation ◽  
Antioxidant Activities ◽  
Carbon Quantum Dots ◽  
Step Process ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

In order to explore an alternative photocatalyst for environmental remediation, we report the two-step process to synthesise the zinc oxide/nitrogen doped carbon quantum dots nanocomposites (ZnO@NCQDs NCs). In the first...

Supersensitization of CdS Quantum Dots with a Near-Infrared Organic Dye: Toward the Design of Panchromatic Hybrid-Sensitized Solar Cells

ACS Nano ◽  
2011 ◽  
Vol 5 (11) ◽  
pp. 9238-9245 ◽  
Author(s):  
Hyunbong Choi ◽  
Roxana Nicolaescu ◽  
Sanghyun Paek ◽  
Jaejung Ko ◽  
Prashant V. Kamat
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Near Infrared ◽  
Organic Dye ◽  
Cds Quantum Dots ◽  
Sensitized Solar Cells

scholarly journals A Novel CdS Quantum Dots Decorated 3D Bi2O2CO3 Hierarchical Nanoflower with Enhanced Photocatalytic Performance

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1046 ◽  
Author(s):  
Zhilin Ji ◽  
Hongwei Wang ◽  
Xilin She
Keyword(s):  
Quantum Dots ◽  
Synergistic Effect ◽  
Rhodamine B ◽  
Active Sites ◽  
Photocatalytic Performance ◽  
High Efficiency ◽  
Environmental Pollutants ◽  
Cds Quantum Dots ◽  
Design And Synthesis ◽  
Cds Qds

Heterojunction engineering has shown great potential in the field of photocatalysis to deal with environmental pollutants. The design and synthesis of heterojunction photocatalysts with high efficiency and stability still face great challenges. In this work, a novel CdS quantum dots (QDs) decorated 3D Bi2O2CO3 hierarchical nanoflower heterojunction photocatalyst (Bi2O2CO3/CdS QDs) was synthesized to investigate the photocatalytic Rhodamine B (RhB) degradation performance. CdS QDs were evenly distributed on the surface of the Bi2O2CO3 nanoflower. Bi2O2CO3/CdS QDs showed significantly enhanced photocatalytic RhB degradation performance compared with pristine Bi2O2CO3 and CdS QDs. The enhanced photocatalytic performance was attributed to the synergistic effect of hierarchical structure and heterojunction, which greatly increased the active sites of the reaction and the photogenerated carriers transfer.

scholarly journals Gamma ray assisted modification of carbon quantum dot/polyurethane nanocomposites: structural, mechanical and photocatalytic study

RSC Advances ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 6278-6286 ◽  
Author(s):  
Milica Budimir ◽  
Zoran Marković ◽  
Dragana Jovanović ◽  
Miloš Vujisić ◽  
Matej Mičušík ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Photocatalytic Degradation ◽  
Gamma Ray ◽  
Organic Dyes ◽  
Carbon Quantum Dots ◽  
Carbon Quantum Dot ◽  
Polyurethane Nanocomposites

The present study reports the results of the gamma ray-assisted modification of hydrophobic carbon quantum dots (hCQDs)/polyurethane nanocomposites for photocatalytic degradation of organic dyes.

scholarly journals Detection of Tumor Marker CA125 in Ovarian Carcinoma Using Quantum Dots

2004 ◽  
Vol 36 (10) ◽  
pp. 681-686 ◽  
Author(s):  
Hui-Zhi Wang ◽  
Hai-Yan Wang ◽  
Ru-Qiang Liang ◽  
Kang-Cheng Ruan
Keyword(s):  
Quantum Dots ◽  
Ovarian Carcinoma ◽  
Laser Power ◽  
Organic Dyes ◽  
Organic Dye ◽  
Continuous Illumination ◽  
Tissue Sections ◽  
High Intensity Laser ◽  
Different Types ◽  
Intensity Laser

Abstract Semiconductor quantum dots (QDs) offer several advantages over organic dyes in fluorescence-imaging applications, such as higher quantum yield, exceptional photostability, and a narrow, tunable, and symmetric emission spectrum. To explore whether QDs could specifically and effectively label tumor markers and be used in immunohistochemistry as a novel type of fluorescent probe, we used quantum dots with maximum emission wavelength 605 nm (QD605) to detect the ovarian carcinoma marker CA125 in specimens of different types (fixed cells, tissue sections, and xenograft piece). Additionally, we compared the photostability of QD signals with that of a conventional organic dye, FITC. All labeling signals of QDs were found to be more specific and brighter than those of FITC. Moreover, the QDs exhibited exceptional photostability during continuous illumination for 1 h by a high-intensity laser (Ar laser power 100 mW) at 488 nm, while the FITC signals faded very quickly and became undetectable after 24 min of illumination. These results indicate that QD-based probes can offer substantial advantages over existing fluorophores in many applications, and can be used effectively in immunohistochemistry as a novel class of fluorescent probes.

Modified graphene quantum dots-zinc oxide nanocomposites for photocatalytic degradation of organic dyes and commercial herbicide

2019 ◽  
Vol 39 (3-4) ◽  
pp. 81-94 ◽  
Author(s):  
Suchada Phophayu ◽  
Pichitchai Pimpang ◽  
Sawitree Wongrerkdee ◽  
Supphadate Sujinnapram ◽  
Sutthipoj Wongrerkdee
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Degradation ◽  
Rate Constant ◽  
Degradation Rate ◽  
Carrier Lifetime ◽  
Organic Dyes ◽  
Graphene Quantum Dots ◽  
High Crystallinity ◽  
Degradation Rate Constant ◽  
Photocatalytic Material

The high crystallinity of graphene quantum dots-ZnO nanocomposites is considered to have a significant effect in improving the carrier lifetime for enhanced photocatalytic degradation. The graphene quantum dots-ZnO nanocomposites were synthesized by adding graphene quantum dots solution into starting precursors during the precipitation. Characterization was performed using various techniques. High crystallinity of graphene quantum dots-ZnO nanocomposites is obtained in terms of increased crystal size and decreased dislocation density. The improved crystallinity increases the carrier lifetime on the material surface for the functional improvement of photocatalytic material. Photocatalytic test of methylene blue and methyl orange was performed under UV irradiation. Degradation rate constant reaches the maximum value for both organic dyes for the appropriate preparing condition of graphene quantum dots-ZnO nanocomposites. The graphene quantum dots-ZnO nanocomposites were then applied to degrade commercial glyphosate herbicide contaminants for an agricultural wastewater treatment investigation. The investigation aims to demonstrate a facile useful way of herbicide contaminant reduction for the better health of farmers. The graphene quantum dots-ZnO nanocomposites show an enhancement of the photocatalytic process with improved degradation rate constant (23% increased) in comparison to pure ZnO. Therefore, this work demonstrates that graphene quantum dots-ZnO nanocomposites can be used as a photocatalytic material for degrading organic dyes and commercial herbicide contaminants owing to its low-cost and environmental-friendly properties.

Highly efficient photocatalytic degradation of rhodamine B by conical graphene quantum dots/cerium oxide composite

2020 ◽  
Vol 46 (3) ◽  
pp. 3827-3836 ◽  
Author(s):  
Hebing Pei ◽  
Hongjuan Zhang ◽  
Zunli Mo ◽  
Ruibin Guo ◽  
Nijuan Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Degradation ◽  
Cerium Oxide ◽  
Rhodamine B ◽  
Graphene Quantum Dots ◽  
Oxide Composite ◽  
Highly Efficient
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