Quantum Dots Based Materials for Water Treatment

2021 ◽  
pp. 280-304
Keyword(s):  
Heavy Metals ◽  
Quantum Dots ◽  
Catalytic Activity ◽  
Water Treatment ◽  
Emission Spectra ◽  
Photo Catalytic Activity ◽  
New Class ◽  
Synthesis Properties ◽  
Sensing Application ◽  
Future Outcomes

Quantum dot is a new class of nanomaterials having size in nanometers (˂10 nm). This material has excellent photo-catalytic activity towards dyes and pollutants with great absorbance and photoluminescence properties. It shows shifting of peak in UV-FL data which indicates the excitation dependent emission spectra means tunable properties in different wavelength and this property makes it a wonderful probe for sensing application for different heavy metals, pollutants present in water. In this chapter the synthesis, properties, types, application of quantum dots and focus on the research that has been done in field of water treatment with possible future outcomes is discussed.

scholarly journals Detection of Heavy Metals in Water Using Graphene Oxide Quantum Dots: An Experimental and Theoretical Study

Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5519
Author(s):  
Lorenzo Gontrani ◽  
Olivia Pulci ◽  
Marilena Carbone ◽  
Roberto Pizzoferrato ◽  
Paolo Prosposito
Keyword(s):  
Heavy Metals ◽  
Quantum Dots ◽  
Graphene Oxide ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Theoretical Study ◽  
Graphene Quantum Dots ◽  
Emission Spectra ◽  
Optical Response ◽  
Graphene Oxide Quantum Dots

In this work, we investigate by ab initio calculations and optical experiments the sensitivity of graphene quantum dots in their use as devices to measure the presence, and concentration, of heavy metals in water. We demonstrate that the quenching or enhancement in the optical response (absorption, emission) depends on the metallic ion considered. In particular, two cases of opposite behaviour are considered in detail: Cd2+, where we observe an increase in the emission optical response for increasing concentration, and Pb2+ whose emission spectra, vice versa, are quenched along the concentration rise. The experimental trends reported comply nicely with the different hydration patterns suggested by the models that are also capable of reproducing the minor quenching/enhancing effects observed in other ions. We envisage that quantum dots of graphene may be routinely used as cheap detectors to measure the degree of poisoning ions in water.

Quantum Dots: Next Generation of Smart Nano-Systems

2019 ◽  
Vol 7 (3) ◽  
pp. 234-245 ◽  
Author(s):  
Mohammed Asadullah Jahangir ◽  
Sadaf Jamal Gilani ◽  
Abdul Muheem ◽  
Mohammed Jafar ◽  
Mohammed Aslam ◽  
...  
Keyword(s):  
Biological Sciences ◽  
Quantum Dots ◽  
Animal Studies ◽  
Emission Spectra ◽  
Optical Probe ◽  
Pharmacokinetic Studies ◽  
Next Generation ◽  
Preparation Methods ◽  
Practical Applications ◽  
New Class

Background: The amalgamation of biological sciences with nano stuff has significantly expedited the progress of biological strategies, greatly promoting practical applications in biomedical fields. Objective: With distinct optical attributes (e.g., robust photostability, restricted emission spectra, tunable broad excitation, and high quantum output), fluorescent quantum dots (QDs) have been feasibly functionalized with manageable interfaces and considerably utilized as a new class of optical probe in biological investigations. Method: In this review article, we structured the current advancements in the preparation methods and attributes of QDs. Furthermore, we extend an overview of the outstanding potential of QDs for biomedical research and radical approaches to drug delivery. Conclusion: Notably, the applications of QDs as smart next-generation nanosystems for neuroscience and pharmacokinetic studies have been explained. Moreover, recent interests in the potential toxicity of QDs are also apprised, ranging from cell investigations to animal studies.

scholarly journals The bright future: Imaging dynamic cellular events with quantum dots

2010 ◽  
Vol 32 (3) ◽  
pp. 12-17 ◽  
Author(s):  
Andrew M. Smith ◽  
Mary M. Wen ◽  
Shuming Nie
Keyword(s):  
Quantum Dots ◽  
Light Emission ◽  
Emission Spectra ◽  
Semiconductor Quantum Dots ◽  
Broad Absorption ◽  
Light Emitting ◽  
Simultaneous Excitation ◽  
New Class ◽  
Cellular Events ◽  
Optical And Electronic Properties

Semiconductor quantum dots (QDs) are tiny light-emitting particles that have emerged as a new class of fluorescent labels for biology and medicine. Compared with traditional fluorescent probes, QDs have unique optical and electronic properties such as size-tuneable light emission, narrow and symmetric emission spectra, and broad absorption spectra that enable the simultaneous excitation of multiple fluorescence colours.

Phosphorene quantum dots: synthesis, properties and catalytic applications

Nanoscale ◽  
2022 ◽  
Author(s):  
Manila Ozhukil Valappil ◽  
Subbiah Alwarappan ◽  
Vijayamohanan K. Pillai
Keyword(s):  
Quantum Dots ◽  
Surface Properties ◽  
Functional Nanostructures ◽  
New Class ◽  
Synthesis Properties ◽  
Catalytic Applications

Phosphorene quantum dots (PQDs) belong to a new class of zero-dimensional functional nanostructures with unique physicochemical and surface properties in comparison with few-layer phosphorene and other 2D analogues.

Application of Geopolymer Composites in Wastewater Treatment

2019 ◽  
pp. 131-149
Author(s):  
Victor Odhiambo Shikuku ◽  
Tome Sylvain
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Water Treatment ◽  
Low Cost ◽  
Environmentally Benign ◽  
Adsorption Efficiency ◽  
Adsorption Mechanisms ◽  
Synthesis Properties ◽  
Removal Of Heavy Metals ◽  
Geopolymer Composites

Geopolymers are amorphous aluminosilicates with some varied applications. However, the use of geopolymers in water treatment is a relatively new subject. This chapter discusses developments in synthesis, properties and applications of geopolymers and their composites for removal of heavy metals and dyes from water including reduction of hardness in water. The adsorption mechanisms and effects of various environmental conditions on adsorption efficiency are also highlighted. The chapter demonstrates that geopolymers are low cost and environmentally benign materials for wastewater treatment and offers opportunities as alternative adsorbents for sequestration of various pollutants from water subject to further investigations.

scholarly journals Detection of Heavy Metals in Water Using Graphene Quantum Dots: An Experimental and Theoretical Study

2021 ◽  
Author(s):  
Lorenzo Gontrani ◽  
Olivia Pulci ◽  
Marilena Carbone ◽  
Roberto Pizzoferrato ◽  
Paolo Prosposito
Keyword(s):  
Heavy Metals ◽  
Quantum Dots ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Theoretical Study ◽  
Graphene Quantum Dots ◽  
Emission Spectra ◽  
Optical Response ◽  
Test Cases

In this work, we investigate by ab initio calculations and optical experiments the sensitiv- ity of graphene quantum dots in their use as devices to measure the presence, and concentration, of heavy metals in water. We demonstrate that the quenching or enhancement in the optical response (absorption, emission) depends on the metallic ion considered. In particular, two test cases of opposite behaviour are considered: Cd 2+ , where we observe an increase in the optical response for increasing concentration, and Pb 2 whose emission spectra are quenched along the concentration rise. We envisage that quantum dots of graphene may be routinely used as cheap detectors to measure the degree of poisoning ions in water

scholarly journals Spectrographic Microfluidic Memory

2005 ◽  
Author(s):  
David Erickson ◽  
Baiyang Li ◽  
James R. Adleman ◽  
Saurabh Vyawahare ◽  
Stephen Quake ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Recent Work ◽  
Data Storage ◽  
Emission Spectra ◽  
Semiconductor Quantum Dots ◽  
Excitation Wavelength ◽  
Data Encoding ◽  
New Class ◽  
Multiple Species ◽  
Tunable Emission

Recent advancements in micro- and nanoscale fluidic manipulation have enabled the development of a new class of tunable optical structures which are collectively referred to as optofluidic devices. In this paper we will introduce our recent work directed towards the development of a spectrographic optofluidic memory. Data encoding for the memory is based on creating spectrographic codes consisting of multiple species of photoluminescent nanoparticles at discrete intensity levels which are suspended in liquids. The data cocktails are mixed, delivered and stored using a series of soft and hard-lithography microfluidic structures. Semiconductor quantum dots are ideally suited for this application due to their narrow and size tunable emission spectra and consistent excitation wavelength. Both pressure driven and electrokinetic approaches to spectral code writing have been developed and will be experimentally demonstrated here. Novel techniques for data storage and readout are also discussed and demonstrated.

NiAg-graphene quantum dot-graphene hybrid with high oxidase-like catalytic activity for sensitive colorimetric detection of malathion

2021 ◽  
Author(s):  
Xu Dan ◽  
Ruiyi Li ◽  
Qinsheng Wang ◽  
Yongqiang Yang ◽  
Haiyan Zhu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Quantum Dot ◽  
Colorimetric Detection ◽  
Graphene Quantum Dots ◽  
Functionalized Graphene ◽  
Graphene Quantum Dot ◽  
Nickel Silver

The paper reports the synthesis of nickel-silver-graphene quantum dot-graphene hybrid. Histidine-functionalized graphene quantum dots (His-GQDs) were bonded to graphene oxide (GO) and then combined with Ni2+ and Ag+ to form...

Modification of energy level diagram of nano-crystalline ZnO by its composites with ZnWO4 suitable for sunlight assisted photo catalytic activity

2021 ◽  
Vol 26 ◽  
pp. 102101
Author(s):  
Vaishali Kale ◽  
Y.M. Hunge ◽  
Shalaka A. Kamble ◽  
Madhuri Deshmukh ◽  
S.V. Bhoraskar ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Energy Level ◽  
Energy Level Diagram ◽  
Photo Catalytic Activity ◽  
Nano Crystalline
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