Unlock instant, AI-driven research and patent intelligence for your innovation.
A method for the visual detection of cadmium in water based on a cysteine-modified gold-silver alloy nanoparticle probe
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A cysteine, gold-silver alloy technology, applied in measurement devices, color/spectral property measurement, analysis by chemical reaction of materials, etc., can solve the problems of high detection cost, long time, application limitations, etc. The effect of short detection time and simple operation
Active Publication Date: 2019-10-29
NANCHANG UNIV
View PDF3 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
Although these methods have high detection sensitivity, they all have the disadvantages of requiring professional technicians, large instruments, high detection costs, and long time consumption, which limit their application.
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
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0022] Embodiment 1: A method for visually detecting cadmium in water based on a gold-silver alloy nanoparticle probe modified by cysteine, comprising the following steps:
[0023] (1) Preparation of cysteine-modified gold-silver alloy nanoparticles
[0024] Accurately pipette 48 μL of 1.0% AgNO 3 solution and 47 μL 1.0% HAuCl 4 The solutions were added to flasks containing 15mL ultrapure water, condensed and refluxed for 5 minutes, then 250 μL of 0.4mM trisodium citrate solution was added at the same time, heated for another 2 minutes, then mixed immediately and continued to stir and heat for 15 minutes to obtain a clear and stable orange color The solution is the gold-silver alloy solution;
[0025] Add 0.7mL 1.0mM cysteine solution to the above-mentioned newly synthesized gold-silver alloy solution and stir at a constant speed for 2 hours to obtain a cysteine-wrapped gold-silver nano-alloy solution, and add NaCl;
[0026] (2) Colorimetric detection of Cd in water 2+ ...
Embodiment 2
[0031] Embodiment 2: The performance of this method is investigated in detail below in conjunction with specific examples, and is explained in conjunction with the accompanying drawings of the description, and the specific steps are as follows:
[0032] 1.1 Instruments and reagents
[0033] UV-2450 ultraviolet-visible spectrophotometer (Shimadzu, Japan), instrument working parameters: scanning wavelength 300-800nm; JEM-2100 high-resolution transmission electron microscope (Japan Electronics Co., Ltd.); Nicomp 380ZLS nanometer particle size analyzer (PSS, USA Particle Size Analyzer Company); pHS-3C acidity meter (Shanghai Leici Instrument Factory); two-way magnetic stirrer (Changzhou Guohua Electric Co., Ltd.); Millipore Simplicity water purification system.
[0034] HAuCl 4 (purity ≥ 99.9%), Shanghai Yuanye Biotechnology Co., Ltd.) and AgNO 3 (purity ≥ 99.8%), Shanghai Reagent No. 1 Factory) was prepared into 1.0% stock solution with ultrapure water; mM solution; Cd 2+ The...
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
Login to View More
Abstract
The invention provides a method for visually detecting cadmium in water based on a cysteine modified gold-silver alloy nano-particle probe. The citric acid radical is simultaneously used as a protecting agent and a reduction agent, HAuC14 and AgNO3 are simultaneously reduced through a chemical reduction method and a condensation backflow test, a gold-silver alloy nano-particle with a grain size of 50nm is prepared and the gold-silver alloy nano-particle is represented. A colorimetric sensing analyzing method for quickly detecting Cd2+ in water is established by modifying the alloy nano-particle surface with cysteine to be taken as a recognition molecule. Under an optimized experiment condition, the method has better selectivity to Cd2+, the detected Cd2+ concentration scope is 0.4muM-38.6muM and the lowest limit of detection is 0.044muM. The method is short in detection time, simple in operation and wide in application prospect for detecting Cd2+ in water.
Description
technical field [0001] The invention relates to a method for detecting cadmium in water, in particular to a method for visually detecting cadmium in water based on a cysteine-modified gold-silver alloy nanoparticle probe. Background technique [0002] With the development of science and technology, heavy metal pollution has become an increasingly serious problem. Cadmium widely exists in water, soil and air, and is one of the important components of heavy metal pollution. It can enter the human body through the food chain, and has a biological half-life of 20–30 years, which may cause great harm to the human body and induce various diseases , so it is of great significance to study a method for detecting cadmium. At present, a variety of analysis and detection methods have been applied to the detection of cadmium, including: atomic fluorescence spectroscopy, inductively coupled plasma mass spectrometry, inductively coupled plasma atomic emission spectrometry, graphite furna...
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
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More