Water Pollution Control and Treatment Based on Quantum Dot Chemical and Biological High-Sensitivity Sensing

Inorganic pollutants in water can have an important impact on ecosystems and human health, so the development of rapid and sensitive detection methods for typical inorganic pollutants in water samples is important for understanding the pollution status of the water environment, as well as water pollution prevention and protection of drinking water safety. Fluorescence sensing technology has the advantages of fast response, high sensitivity, simple operation, and low cost but still has the problems of low quantum yield, cumbersome construction process, and limited practical applications. Based on the excellent fluorescence properties, a series of fluorescence sensing was constructed for the rapid, highly sensitive, and selective detection of various typical inorganic pollutants in water. And the related fluorescence sensing mechanism was investigated in this paper. In this paper, nitrogen/sulfur codoped carbon quantum dots (N, S-CQDs) were prepared for the sensitive and selective detection of sulfide and ferric ion. The blue fluorescent N, S-CQDs were prepared by a one-step hydrothermal method using ammonium citrate and L-cysteine as raw materials, which have excitation wavelength dependence and fluorescence quantum yield of 16.1% for the selective detection of sulfides with a detection limit ( S / N = 3 ) of 11.0 nM (about 0.35 μg/L). CQDs with significantly higher fluorescence quantum yields (69%) and no excitation dependence were prepared when citric acid was used instead of ammonium citrate and were used for the selective detection of ferric ion with a detection limit of 14.0 nM (~0.8 μg/L). The method has been successfully applied to the determination of total phosphorus in surface water and human urine, and the fluorescence color change of the dual-emission sensing can be used for the naked-eye identification and semiquantitative detection of phosphate.

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A simple sensor based on 1,8-naphthalimide with large Stokes shift for detection of hypochlorous acid in living cells

RSC Advances ◽

10.1039/c9ra06174f ◽

2019 ◽

Vol 9 (54) ◽

pp. 31196-31201 ◽

Cited By ~ 5

Author(s):

Chunpeng Jiao ◽

Yuanyuan Liu ◽

Wenjuan Lu ◽

Pingping Zhang ◽

Xia Ma ◽

...

Keyword(s):

Detection Limit ◽

Quantum Yield ◽

Fluorescence Quantum Yield ◽

Hypochlorous Acid ◽

Stokes Shift ◽

High Sensitivity ◽

Living Cells ◽

High Fluorescence ◽

Excellent Selectivity ◽

High Fluorescence Quantum Yield

Probe 1 shows excellent selectivity to HOCl among different ions including common ROS, high sensitivity, high fluorescence quantum yield (Φ = 0.93), low detection limit (0.237 μM) and successfully used for the detection of HOCl in cells.

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Fluorescence Sensing Platforms for Epinephrine Detection Based on Low Temperature Cofired Ceramics

Sensors ◽

10.3390/s20051429 ◽

2020 ◽

Vol 20 (5) ◽

pp. 1429

Author(s):

Sylwia Baluta ◽

Karol Malecha ◽

Agnieszka Świst ◽

Joanna Cabaj

Keyword(s):

Detection Limit ◽

Low Temperature ◽

High Sensitivity ◽

Fluorescence Sensing ◽

Free System ◽

Injection Test ◽

Sensing Platforms ◽

Sensitivity And Selectivity ◽

Cofired Ceramics ◽

Optimized Conditions

A novel fluorescence-sensing pathway for epinephrine (EP) detection was investigated. The ceramic-based miniature biosensor was developed through the immobilization of an enzyme (laccase, tyrosinase) on a polymer—poly-(2,6-di([2,2′-bithiophen]-5-yl)-4-(5-hexylthiophen-2-yl)pyridine), based on low temperature cofired ceramics technology (LTCC). The detection procedure was based on the oxidation of the substrate, i.e., in the presence of the enzyme. An alternative enzyme-free system utilized the formation of a colorful complex between Fe2+ ions and epinephrine molecules. With the optimized conditions, the analytical performance illustrated high sensitivity and selectivity in a broad linear range with a detection limit of 0.14–2.10 nM. Moreover, the strategy was successfully used for an EP injection test with labeled pharmacological samples.

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A high-sensitivity fluorescent probe with a self-immolative spacer for real-time ratiometric detection and imaging of alkaline phosphatase activity

New Journal of Chemistry ◽

10.1039/c9nj02230a ◽

2019 ◽

Vol 43 (30) ◽

pp. 11887-11892 ◽

Cited By ~ 3

Author(s):

Xueyan Zhang ◽

Xiangzhu Chen ◽

Yuanyuan Zhang ◽

Gui Gao ◽

Xiaoqian Huang ◽

...

Keyword(s):

Alkaline Phosphatase ◽

Detection Limit ◽

Quantum Yield ◽

Alkaline Phosphatase Activity ◽

High Sensitivity ◽

Fast Response ◽

High Quantum Yield ◽

Ratiometric Detection ◽

Excellent Selectivity ◽

Ratio Response

The probe APW uses a self-immolative mechanism to achieve a ratio response to ALP, which has the following advantages: fast response (in less than 15 min), high quantum yield (Φ = 0.6), low detection limit (0.46 U L−1) and excellent selectivity.

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Surface molecular imprinting on CdTe quantum dots for fluorescence sensing of 4-nitrophenol

Analytical Methods ◽

10.1039/c5ay03160e ◽

2016 ◽

Vol 8 (10) ◽

pp. 2226-2232 ◽

Cited By ~ 14

Author(s):

Linye Jiang ◽

Haijian Liu ◽

Ming Li ◽

Yue Xing ◽

Xueqin Ren

Keyword(s):

Quantum Dots ◽

Detection Limit ◽

Molecular Imprinting ◽

Fluorescent Sensor ◽

High Sensitivity ◽

Surface Molecular Imprinting ◽

Fluorescence Sensing ◽

Lower Detection Limit ◽

Lower Detection ◽

Sensitivity And Selectivity

The developed fluorescent sensor provides high sensitivity and selectivity and a lower detection limit than previously developed sensors.

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A novel FRET-based fluorescent probe for the selective detection of hydrogen sulfide (H2S) and its application for bioimaging

Journal of Materials Chemistry B ◽

10.1039/c8tb01070f ◽

2018 ◽

Vol 6 (30) ◽

pp. 4903-4908 ◽

Cited By ~ 43

Author(s):

Qi Zhao ◽

Fangjun Huo ◽

Jin Kang ◽

Yongbin Zhang ◽

Caixia Yin

Keyword(s):

Hydrogen Sulfide ◽

Detection Limit ◽

Fluorescent Probe ◽

Nude Mice ◽

High Sensitivity ◽

Fast Response ◽

Living Cells ◽

Selective Detection ◽

Low Detection Limit ◽

Sensitivity And Selectivity

Herein, our group developed a fast response fluorescent probe (Flu-N3) for H2S on the basis of the 7-amino-4-methylcoumarin and fluorescein FRET system with high sensitivity and selectivity and a low detection limit of 0.031 μM. Moreover, the probe was successfully applied to image exogenous and endogenous H2S in living cells and nude mice.

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Water Pollution and Its Impact on Environment of Society

International Research Journal of Management IT and Social Sciences ◽

10.21744/irjmis.v3i5.10 ◽

2016 ◽

Vol 3 (5) ◽

Author(s):

N. Thyagaraju

Keyword(s):

Water Pollution ◽

Pollution Prevention ◽

Human Beings ◽

Individual Level ◽

The Public ◽

The Government ◽

Living Organisms ◽

Set Up ◽

Biological Entities ◽

Micro Organisms

The present seminar paper mainly highlight the concept of water pollution, causes of water pollution, Its Effects, Elements of pollutants, Methods used to prevent the water pollution in environment and the mandatory initiatives taken by the concerned authorities for prevention of water pollution. Water is essential for survival of all living organisms on the earth. Thus for human beings and plants to survive on land, water should be easily accessible. The term “Pollution” is generally refers to addition of any foreign body either living or non – living or deletion of anything that naturally exists. The basic Sources of Water pollution causes due to Culmination into lakes, rivers, ponds, seas, oceans etc. Domestic drainage and sanitary waste, Industrial drainage and sewage, Industrial waste from factories, Dumping of domestic garbage, Immersion of Idols made of plaster of Paris, Excess use of Insecticides , pesticides, fungicides, Chemical fertilizers, Soil erosion during heavy rains and floods, Natural disasters, tsunami etc. General pollutants which are also caused for water pollution which include Organic, Inorganic, and Biological entities, Insecticides, Pesticides, Disinfectants ,Detergents, Industrial solvents, Acids, Ammonia fertilizers, heavy metals, Harmful bacteria, Virus, Micro –Organisms and worms, Toxic chemicals. Agricultural lands become infertile and thereby production also drops, Spread of epidemic diseases like Cholera, Dysentery, Typhoid, Diarrhea, Hepatitis, Jaundice etc. The basic responsibility of the Government, NGOs, National Pioneer scientific Research Institutions may conduct research oriented programs on control of water pollution by create awareness among the public through mass media and Environmental Education on recycling units, and water treatment plants must be established both at domestic levels and Industry levels, Every citizen must feel responsible to control water pollution. There have been many water pollution prevention acts that have been set up by the governments of the world. But these are not enough for permanent water pollution solutions. Each of us needs to take up the responsibility and do something at an everyday at individual level. Otherwise we can’t survive in a society forever in a future.

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Synthesis of N2, N6-bis(5-methylthiazol-2-yl)pyridine-2,6-dicarboxamide fluoroscent sensor for detection of Cu2+ and Ni2+ Ions

Drug Research ◽

10.1055/a-1302-7649 ◽

2021 ◽

Author(s):

Anuroop Kumar ◽

Netrapal Singh ◽

Mordhwaj Kumar ◽

Uma Agarwal

Keyword(s):

Spectral Analysis ◽

Detection Limit ◽

Metal Ions ◽

1H Nmr Spectroscopy ◽

Stoichiometric Ratio ◽

Selective Detection ◽

Ft Ir ◽

Uv Visible ◽

Complexes With Metal Ions ◽

Competitive Ions

AbstractThis article reports an amide based Chemosensor used for selective detection of divalent Cu+2 and Ni+2 ions via Fluorescence turn off. The selective sensing ability of Chemosensor was investigated in presence of different metal ions Mg2+, Ag+, Fe2+, K+, Cu2+, Ni2+, Hg2+, Pb2+, Mn2+, Pd2+, Cd2+ and Mn3+ as competitive ions. The receptor i. e. Chemosensor formed complexes with metal ions in 1:1 stoichiometric ratio. The detection limit and binding constant calculated as 1.92×10–4 and 1.4×10–4 M and 2.16×103 M−1 and 3.09×103 M−1 for Cu2+ and Ni2+ions respectively. The complexes were characterized by UV/visible, FT-IR, 13C NMR and 1H NMR spectroscopy. Further the structure and Crystallinity were calculated by P-XRD spectral analysis. The crystallinity found to be 65.27 and 67.87% respectively

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