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A kind of nano-gold solution and the method using this nano-gold solution to detect CO2+

A nano-gold and solution technology, applied in the field of environmental science, analytical chemistry and computational chemistry, and inspection chemistry, can solve the problems of unsatisfactory detection effect and insufficient detection sensitivity, and achieve simple modification methods and strong competitive reactions , good repeatability

Active Publication Date: 2015-10-28
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sensitivity remains at 10 -7 M order of magnitude, higher than the international standard for Co in safe drinking water 2+ The maximum allowable content is 6.8×10 -8 M, therefore, when Co in drinking water 2+ content below 10 -7 When the order of magnitude is M, the detection effect is not ideal, and the detection sensitivity does not meet the international standards.

Method used

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  • A kind of nano-gold solution and the method using this nano-gold solution to detect CO2+
  • A kind of nano-gold solution and the method using this nano-gold solution to detect CO2+
  • A kind of nano-gold solution and the method using this nano-gold solution to detect CO2+

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] In this example, the functionalized nano-gold solution was prepared by the following steps:

[0067] (1) Preparation of nano-gold mixed solution

[0068] At room temperature, take 5 mL of 5 mM chloroauric acid tetrahydrate (HAuCl 4 4H 2 O) solution, add 95 mL of deionized water and 1.5 mL of 2M cetyltrimethylammonium bromide (CH 3 (CH 2 ) 15 NBr(CH 3 ) 3 ) solution, stirred for 20min; then 1.5mL of 0.1M sodium borohydride (NaBH 4 ), continue to stir for 20 min to prepare a mixed solution of gold nanoparticles, and place it in a refrigerator at 4°C for later use.

[0069] (2) Ionic clusters containing sulfur elements and carbon-oxygen groups (O=C=O) modified gold nanoparticles

[0070] Take 50 mL of the mixed gold nanoparticles solution prepared in the above step (1), stir, and add 40 μL of thioglycolic acid (HSCH 2 CO 2 H), until the mixture is evenly mixed, use 0.2M sodium hydroxide (NaOH) or hydrochloric acid (HCl) to adjust the pH value of the mixed solutio...

Embodiment 2

[0092] In this example, the functionalized nano-gold solution was prepared by the following steps:

[0093] (1) Preparation of nano-gold mixed solution

[0094] At room temperature, take 5 mL of 5 mM chloroauric acid trihydrate (HAuCl 4 ·3H 2 O) solution, add 95 mL of deionized water and 5 mL of 0.04M cetyltrimethylammonium bromide (CH 3 (CH 2 ) 15 NBr(CH 3 ) 3 ) solution, stirred for 15min; then 2mL of 0.1M potassium borohydride (KBH 4 ), continue to stir for 20 min to prepare a mixed solution of gold nanoparticles, and place it in a refrigerator at 4°C for later use.

[0095] (2) Ionic clusters containing sulfur elements and carbon-oxygen groups (O=C=O) modified gold nanoparticles

[0096] Take 100 mL of the nano-gold mixed solution prepared in the above step (1), stir, and add 100 μL of 3-mercaptopropionic acid (HSCH 2 CH 2 CO 2 H), after stirring and mixing evenly, use 0.2M sodium hydroxide (NaOH) or hydrochloric acid (HCl) to adjust the pH value of the mixed so...

Embodiment 3

[0099] In this example, the functionalized nano-gold solution was prepared by the following steps:

[0100] (1) Preparation of nano-gold mixed solution

[0101] At room temperature, take 5mL of 5mM chloroauric acid (HAuCl 4 ) solution, add 95mL of deionized water and 1mL of 0.5M cetyltrimethylammonium bromide (CH 3 (CH 2 ) 15 NBr(CH 3 ) 3 ) solution, stirred for 10 min; the oil bath was heated to 80°C, then 50mL of 1M L-Ascorbic acid (L-Ascorbic acid) was added dropwise, continued heating and stirring for 5min, and cooled naturally to obtain a mixed solution of gold nanoparticles, which was placed in a refrigerator at 4°C for later use .

[0102] (2) Ionic clusters containing sulfur elements and carbon-oxygen groups (O=C=O) modified gold nanoparticles

[0103] Take 100mL of the nano-gold mixed solution prepared in the above step (1), stir, and add 10mL of 92mM L-cysteine ​​(HSCH 2 CHNH 2 CO 2 H), after stirring and mixing evenly, the pH value of the mixed solution wa...

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Abstract

The invention discloses a nanogold solution and a method for detecting Co<2+> by using the same. The water soluble functional nanogold solution is prepared by using a gold salt as the resource of gold nanoparticles, a quaternary ammonium salt as a surfactant, ion clusters containing sulfur elements and carbon oxygen groups (O=C=O) as ligands, sodium borohydride, potassium borohydride or ascorbic acid as a reducing agent, and deionized water as a synthesis medium and by modifying the surface of the nanogold with the ion clusters containing sulfur elements and carbon oxygen groups (O=C=O) under the action of gold-sulfur bonds (Au-S). The nanogold solution has high speed, selectivity, sensitivity and practicality for detection of trace amount of Co<2+> in the water solution system, and therefore can be used in combination of a colorimetric process for detecting trace amount of Co<2+>; the detection concentration is lower than 8.5*10<-7>M; the detection threshold value may reach 5*10<-10>M; the detection speed is high, the selectivity is high, the cost is low, and the carrying is convenient; and the detection method has a bright application prospect in fields of environmental science, detection chemistry and analysis chemistry, and the like.

Description

technical field [0001] The invention relates to the fields of environmental science, test chemistry, analytical chemistry and computational chemistry, in particular to a cobalt ion (Co 2+ ) for extremely sensitive and rapid colorimetric assays. Background technique [0002] Cobalt is one of the basic trace elements needed by humans and animals. as vitamin B 12 component of the Co 2+ Can promote the formation of hemoglobin cells. However, excess Co 2+ Entering human or animal body will produce toxicity. If people or animals are used for a long time by Co 2+ Polluted water, Co 2+ It will produce toxic side effects, causing people or animals to suffer from various diseases, such as anorexia, redness of the face, vasodilation, rapid heart rate, anemia, cardiomyopathy, etc. Therefore, the determination of Co in ambient water 2+ content appears to be very important. [0003] Currently, the determination of Co 2+ The instruments and equipments used include: electrically ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B82Y40/00B82Y30/00G01N21/33G01N21/78
Inventor 冷玉敏吴爱国
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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