scholarly journals Water Safety for Human Health: Detection of Pollutants by Blue-Emission Carbon Quantum Dots via Three Modes in Different Polluted Water Bodies

2021 ◽  
Author(s):  
Shujuan DAI ◽  
Xiaoliang HAO ◽  
Zhigang FANG ◽  
Jing GUO ◽  
Yingxue TENG
Keyword(s):  
Human Health ◽  
Surface Passivation ◽  
Blue Emission ◽  
Inner Filter Effect ◽  
Carbon Quantum Dots ◽  
Polluted Water ◽  
Lemon Yellow ◽  
Health It ◽  
Water Safety ◽  
Blue Fluorescence

Water quality directly affects human health. It is very important to design a probe that can detect the pollutants in water. In this study, we synthesized one kind of carbon dots (CDs), which could emit strong blue fluorescence. The blue fluorescence could be quenched by 2,4,6-trinitrophenol (TNP) ascribed to the energy transfer (ET), could be quenched by lemon yellow (LY) ascribed to inner filter effect (IFE), and could be quenched by HClO ascribed to surface passivation (SP). TNP, LY, and HClO are common contaminants in water. By our experiment, it was proved that the synthesized CDs are a safe and effective fluorescent material and could be used to detect the pollutants (TNP, LY, and HClO) in the actual water sample.

scholarly journals Real-time photovoltaic parameters assessment of carbon quantum dots showing strong blue emission

RSC Advances ◽  
2022 ◽  
Vol 12 (3) ◽  
pp. 1352-1360
Author(s):  
Karan Surana ◽  
R. M. Mehra ◽  
Saurabh S. Soni ◽  
Bhaskar Bhattacharya
Keyword(s):  
Solar Cell ◽  
Real Time ◽  
Blue Emission ◽  
Carbon Quantum Dots ◽  
Time Dependent ◽  
Blue Fluorescence ◽  
Strong Blue Emission ◽  
Photovoltaic Parameters ◽  
Bright Blue Fluorescence ◽  
Bright Blue

Carbon QD showing bright blue fluorescence aid in improving the photovoltaic parameters in a co-sensitized solar cell. Time-dependent I–V analysis revealed the real-time functioning of the device.

scholarly journals A Risk Assessment for Ozone Regulation Based on Statistical Rollback

2021 ◽  
Vol 11 (5) ◽  
pp. 2388
Author(s):  
Yongku Kim ◽  
Jeongjin Lee
Keyword(s):  
Public Health ◽  
Risk Assessment ◽  
Human Health ◽  
Air Pollutants ◽  
Hierarchical Bayesian Models ◽  
Health It ◽  
Matching Method ◽  
Regulatory Standards ◽  
Ozone Regulation ◽  
Ozone Levels

In environmental studies, it is important to assess how regulatory standards for air pollutants affect public health. High ozone levels contribute to harmful air pollutants. The EPA regulates ozone levels by setting ozone standards to protect public health. It is thus crucial to assess how various regulatory ozone standards affect non-accidental mortality related to respiratory deaths during the ozone season. The original rollback approach provides an adjusted ozone process under a new regulation scenario in a deterministic fashion. Herein, we consider a statistical rollback approach to allow for uncertainty in the rollback procedure by adopting the quantile matching method so that it provides flexible rollback sets. Hierarchical Bayesian models are used to predict the potential effects of different ozone standards on human health. We apply the method to epidemiologic data.

A green synthetic route for the surface-passivation of carbon dots as an effective multifunctional fluorescent sensor for the recognition and detection of toxic metal ions from aqueous solution

2019 ◽  
Vol 11 (4) ◽  
pp. 490-506 ◽  
Author(s):  
K. Radhakrishnan ◽  
P. Panneerselvam ◽  
M. Marieeswaran
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Carbon Dots ◽  
Surface Passivation ◽  
Fluorescent Sensor ◽  
Toxic Metal ◽  
Carbon Quantum Dots ◽  
Synthetic Route ◽  
One Pot ◽  
Hydrothermal Methods

In this work, a green synthetic route was used to create a number of surface passivated fluorescent carbon quantum dots, which are explored as promising sensing probes, via facile one-pot hydrothermal methods.

Comparative Optical Studies of Chemically Synthesized Silicon Nanocrystals

1996 ◽  
Vol 452 ◽  
Author(s):  
Gildardo R. Delgado ◽  
Howard W.H. Lee ◽  
Susan M. Kauzlarich ◽  
Richard A. Bley
Keyword(s):  
Porous Silicon ◽  
Silicon Nanocrystals ◽  
Surface Passivation ◽  
Theoretical Calculations ◽  
Dominant Role ◽  
Blue Emission ◽  
Surface States ◽  
Si Nanocrystals ◽  
Optical And Electronic Properties ◽  
Passivation Layers

AbstractWe studied the optical and electronic properties of silicon nanocrystals derived from two distinct fabrication procedures. One technique uses a controlled chemical reaction. In the other case, silicon nanocrystals are produced by ultrasonic fracturing of porous silicon layers. We report on the photoluminescence, photoluminescence excitation, and absorption spectroscopy of various size distributions derived from these techniques. We compare the different optical properties of silicon nanocrystals made this way and contrast them with that observed in porous silicon. Our results emphasize the dominant role of surface states in these systems as manifested by the different surface passivation layers present in these different fabrication techniques. Experimental absorption measurements are compared to theoretical calculations with good agreement. Our results provide compelling evidence for quantum confinement in both types of Si nanocrystals. Our results also indicate that the blue emission from very small Si nanocrystals corresponds to the bandedge emission, while the red emission arises from traps.

A novel cell membrane-targeting fluorescent probe for imaging endogenous/exogenous formaldehyde in live cells and zebrafish

The Analyst ◽  
2021 ◽  
Author(s):  
Wenlong Sheng ◽  
Xue Zhang ◽  
Miaohui Yu ◽  
Meng Jin ◽  
Ning Li ◽  
...  
Keyword(s):  
Economic Development ◽  
Cell Membrane ◽  
Human Health ◽  
Fluorescent Probe ◽  
Live Cells ◽  
Membrane Targeting ◽  
Health It ◽  
Global Pollutant

Formaldehyde (FA) is not only an economic chemical but also a global pollutant. Although it brings economic development, it poses a threat to human health. It is also a kind...

scholarly journals Lebanon: The Effect of Sea Pollution on Humans

1970 ◽  
pp. 30
Author(s):  
Marie Abboud Abi Saab
Keyword(s):  
Human Health ◽  
Polluted Water ◽  
Degree Of Contamination ◽  
Sea Pollution

Sea pollution affects humans on two levels: 1) either through contact, by swimming in polluted water, or 2) through consumption of contaminated sea food and fish. In other words, human health will be affected according to the degree of contamination or pollution of the sea and its inhabitants.

Dibenzo[f,h]furo[2,3-b]quinoxaline-based molecule scaffold as deep blue fluorescence materials for organic light-emitting diodes

2021 ◽  
Author(s):  
XinYe Wang ◽  
Yuan Wu ◽  
ChuanMing Wu ◽  
Yixiang Li ◽  
Dongdong Wang ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Blue Emission ◽  
Organic Light Emitting Diodes ◽  
Molecular Scaffolds ◽  
Blue Fluorescence ◽  
Light Emitting ◽  
Highly Efficient ◽  
Deep Blue ◽  
Organic Light

Two novel molecular scaffolds, dibenzo[f,h]furo[2,3-b]quinoxaline (diBFQ) and its derivative, 3,6-bis(4-isopropylphenyls)-11-phenyldibenzo[f,h]furo[2,3-b]quinoxaline (dP-diBFQ), and furo[2',3':5,6]pyrazino[2,3-f][1,10]phenanthroline (FPPhen), were designed and syn-thesized for highly efficient pure and deep blue emission. The unsubstituted molecule scaffold...

scholarly journals Impact of Kapotaksha river water pollution on human health and environment

2020 ◽  
Vol 31 (1) ◽  
pp. 1-9
Author(s):  
MA Hanif ◽  
R Miah ◽  
MA Islam ◽  
S Marzia
Keyword(s):  
Water Pollution ◽  
Human Health ◽  
River Water ◽  
Polluted Water ◽  
River Bank ◽  
Sewage System ◽  
The People ◽  
Living Organisms ◽  
River Water Pollution

This study was conducted to evaluate the Kapotaksha River water pollution status and its impacts on Human health and Environment. This study conducted a case study on four selected areas (Barakpur, Srirampur, Prbazar, and Gouranandapur) on the Kapotaksha river bank at Jhikargas Upazila. This river water pollution occurs by some natural process such as flood, storm, and natural biodegraded. But human activities are major reasons for the river water pollution. Industrialization, urbanization, domestic waste, sewage system, agrochemicals, etc are major causes for river water pollution. This more polluted water has an impact on human health and environment. This study was conducted to find out the polluted water due to various types of diseases such as scabies, asthma, dysentery and respiratory disease. Most of the people (49%) are affected by Scabies, 4% are affected by diarrhea, 5% are affected by dysentery, 25% of people are suffering from respiratory diseases and 4% are suffering from asthma and the polluted water pollutes soil by using the water in agriculture purpose answered by 20% respondents which is 100% of farmer respondents. If someone does not use this water can not affect soil answered by 80% of respondents. This river water becomes more polluted and harmful for human health and environment because this water hampered by the local colony, local trader, lack of proper management of sewage system, miss-use on the riverbank area for the dumping various solid waste on the river bank, chemical fertilizers, industries etc. At present now we cannot fulfill control this continuous river water pollution but we can minimize this problem and it would be positive for human health, others living organisms and Environment. Progressive Agriculture 31 (1): 1-9, 2020

Efficient one-pot synthesis of carbon dots as a fluorescent probe for the selective and sensitive detection of rifampicin based on the inner filter effect

2018 ◽  
Vol 10 (33) ◽  
pp. 4085-4093 ◽  
Author(s):  
Zhu Han ◽  
Yuwei Long ◽  
Shuang Pan ◽  
Hui Liu ◽  
Jidong Yang ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Carbon Dots ◽  
Low Cost ◽  
Ammonium Thiocyanate ◽  
Inner Filter Effect ◽  
Ammonium Citrate ◽  
Blue Fluorescence ◽  
One Pot ◽  
One Pot Synthesis ◽  
Hydrothermal Approach

In this paper, carbon dots (CDs) emitting blue fluorescence were prepared using ammonium citrate and ammonium thiocyanate through a low-cost hydrothermal approach.

Sign in / Sign up

Export Citation Format

Share Document