Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Porous carbon doped silver nanoparticles capable of visually and rapidly detecting mercury ions

A technology of silver nanoparticles and porous carbon, which is applied in the field of doped porous carbon silver nanoparticles and porous carbon doped silver nanoparticles, can solve the problems of complex preparation, high selectivity, instability, etc., and achieve simple and dispersed preparation methods. Good stability and mild reaction conditions

Active Publication Date: 2017-01-04
肇庆市肇老师科技有限公司
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many mercury colorimetric sensors based on nanomaterials. For example, Liu et al. based on single-stranded DNA modified gold nanoparticles agglomerated in the presence of mercury ions, and the color of the solution changed from red to blue. A method for detecting trace mercury in water was established. The method of ions has a detection limit of 250nM (Liu C W, et al.Chem.Commun., 2008, 2242-2244), but the selectivity and sensitivity of the method are low, and the reagent chloroauric acid used is expensive
The complex formed by Li et al. based on T base-rich G-tetrad DNase and porphyrin iron (hemin) has horseradish peroxidase-like properties and can catalyze ABTS and H 2 o 2 The reaction produces a blue-green product. When mercury ions exist in the system, G-tetrad DNase specifically combines with mercury ions to form T-Hg 2+ -T stabilizes the structure so that porphyrin iron (hemin) cannot catalyze the oxidation of H by ABTS 2 o 2 Thereby realize the colorimetric detection to mercury (Li T, et al., Chem.Commun., 2009, 3551-3553), the selectivity of the method is high, the G-tetrad DNase that is rich in T base, the preparation is complicated ,high cost
Synthesis of a magnetic composite material Au@Fe by Zhang et al. 3 o 4 @GO, the material is in Hg 2+ Can catalyze TMB and H when present 2 o 2 The reaction produces a blue product, Hg 2+ Detection limit reaches 0.15nM (Zhang S, et al.Nanoscale, 2015,45 (7): 8495-8502), this method sensitivity and selectivity are high, but used material and reagent relate to chloroauric acid, graphene, cost High, which limits its popularization and application
For reducing cost, people such as Annadhasan M adopts tyrosine as stabilizer and reducing agent, the silver nanoparticle of synthesis, colorimetric detection mercury ion, detection limit 16nM (Annadhasan M, et al.ACS Sustainable Chemistry & Engineering, 2014,2 (4 ): 887-896.); Shen Z et al. used microwave radiation to synthesize silver nanoparticles in an alkaline solution of lignin, and colorimetrically detected mercury ions with a detection limit of 23nM (Shen Z, et al.ACS Applied Materials & Interfaces, 2014,6 (18):16147-16155.), but the selectivity of the above method is not high enough
Based on the fact that nano-manganese oxide has horseradish peroxidase-like properties, it can catalyze TMB and H 2 o 2 The reaction produces a blue product, and glutathione can prevent nano-manganese oxide from catalyzing TMB and H 2 o 2 The reaction makes the blue color disappear. When mercury ions exist, the catalytic activity of nano-manganese oxide can be restored due to the coordination of mercury ions and glutathione, so that the blue color of the solution can be restored, thereby constructing a mercury ion detection method with a detection limit of 80nM (Yang H, et al.Angew Chem Int Ed,2009,48(13):2308.), but this method is not simple enough, the sensitivity is not high enough, and the H used in the method 2 o 2 Unstable, affecting the reproducibility and accuracy of the results
Xu Xiufang used trisodium citrate as a stabilizer, NaBO 4 Silver nanoparticles were prepared as a reducing agent. The prepared silver nanoparticles can catalyze dissolved oxygen in the solution to oxidize TMB to produce blue products in the presence of mercury ions. A colorimetric detection method for trace mercury was established with a detection limit of 28nM (Xu Xiufang. Nanomaterials mimic enzymes and their analytical applications [D]. Jiangsu: Jiangnan University, 2014.), this method avoids the use of unstable and destructive hydrogen peroxide, but the sensitivity and selectivity need to be further improved

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Porous carbon doped silver nanoparticles capable of visually and rapidly detecting mercury ions
  • Porous carbon doped silver nanoparticles capable of visually and rapidly detecting mercury ions
  • Porous carbon doped silver nanoparticles capable of visually and rapidly detecting mercury ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: Preparation of doped porous carbon silver nanoparticles for rapid detection of mercury ions according to the present invention.

[0022] The principle diagram of the preparation of the doped porous carbon-silver nanoparticles for rapid detection of mercury ions described in this example is as follows figure 1 Shown, preparation method comprises the following steps:

[0023] (1) Add 100mL of deionized water, 20mL of methyl methacrylate and 0.04g of potassium persulfate into a 250mL three-necked flask in sequence, turn on the cooling water, pass nitrogen, and react in a water bath at 90°C for 1 hour under mechanical stirring at 350r / min. A polymethyl methacrylate emulsion (PMMA) is obtained. (2) Add 0.5g sucrose and 0.1g polypyrrole in turn to 20g PMMA emulsion, stir mechanically at 350r / min for 15min, then add 1mL 0.5mol / L H 2 SO 4 , in situ self-assembly reaction for 15 min. The resulting product was poured into a petri dish and dried in a drying oven ...

Embodiment 2

[0024] Embodiment 2: Preparation of doped porous carbon silver nanoparticles for rapid detection of mercury ions according to the present invention.

[0025] The principle diagram of the preparation of the doped porous carbon-silver nanoparticles for rapid detection of mercury ions described in this example is as follows figure 1 Shown, preparation method comprises the following steps:

[0026] (1) Add 120mL of deionized water, 20mL of methyl methacrylate and 0.08g of potassium persulfate to a 250mL three-necked flask in sequence, turn on the cooling water, pass nitrogen, and react in a water bath at 90°C for 2 hours under mechanical stirring at 500r / min. A polymethyl methacrylate emulsion (PMMA) is obtained. (2) Add 0.75 g of sucrose and 0.15 g of polypyrrole to 30 g of PMMA emulsion in turn, stir mechanically at 350 r / min for 20 min, then add 1 mL of 1.0 mol / L H 2 SO 4 , in situ self-assembly reaction for 20min. The resulting product was poured into a petri dish and drie...

Embodiment 3

[0027] Example 3: Porosity of porous carbon (DHPC) nanoparticles according to the present invention.

[0028] SEM detection: the porous carbon (DHPC) nanoparticles prepared in Example 1 were observed by SEM, as figure 2 As shown, the prepared macroporous carbon ( figure 2 A) the pore size is relatively large, and the pore distribution is even; the porous carbon obtained after lye activation treatment ( figure 2 B) The surface is smooth, the pore diameter is obviously smaller, there are macropores, micropores and mesopores, mainly micropores, and the specific surface area is large. The calculated BET surface area is 840cm 2 / g, the total pore volume is 2.1cm 3 / g.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to porous carbon doped silver nanoparticles DHPC@CS-AgNPs capable of visually and rapidly detecting mercury ions. The porous carbon doped silver nanoparticles DHPC@CS-AgNPs are prepared by taking organic glass latex as a template, sucrose and polypyrrole as carbon sources and sulfuric acid as a catalyst, carrying out in-situ self-assembling, drying and carbonization to obtain macroporous carbon; carrying out alkali liquid treatment to obtain the porous carbon, taking sodium borohydride as a reducing agent in a porous carbon-chitosan ultrasonic dispersion solution, and dropwise adding AgNO3. According to the particles provided by the invention, a preparation method of the particles is simple, reaction conditions are moderate and the dispersion stability is good; the particles coexist with Hg<2+> so as to have high mimetic oxidase activity, and can be used for rapidly, sensitively and highly selectively detecting trace Hg<2+> in foods and environment samples through a colorimetric manner. A detection method is visible, is simple in instruments and equipment, is rapid and sensitive and is high in selectivity, so that the detection method is suitable for being popularized and applied to primary laboratories can be widely applied to visible and rapid analysis of the trace Hg<2+> in the foods and the environment samples.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a doped porous carbon-silver nanoparticle, in particular to a porous carbon-doped silver nanoparticle which coexists with mercury ions and has high oxidation-mimicking enzyme activity, and can be directly applied to food and environmental samples Visual rapid detection of trace mercury ions. Background technique [0002] Mercury is a heavy metal that is widely used. Common mercury vapor lamps, batteries, mercury thermometers, paints, pesticides, insecticides, dental amalgams, medicines for scabies, and raw materials for malignant sores contain mercury to varying degrees. Improper handling of these products during production and after use can easily cause mercury pollution. Mercury severely damages the central nervous system, manifesting the following symptoms: tremors, neuropsychiatric symptoms, toxic nephropathy, and stomatitis. In addition, it will also affect the human nervo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/78
CPCG01N21/31G01N21/78
Inventor 韦寿莲刘永汪洪武姚夙
Owner 肇庆市肇老师科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products