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Preparation method of carbon quantum dot containing calcium alginate gel for detecting copper ions

A calcium alginate, carbon quantum dot technology, applied in chemical instruments and methods, luminescent materials, material excitation analysis, etc., can solve the problems of complex processing steps, low detection sensitivity, poor selectivity, etc., to achieve excellent forming ability, enhanced Fluorescent properties and good formability

Inactive Publication Date: 2013-03-13
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some shortcomings in the above methods: 1) expensive large-scale instruments and equipment are required; 2) sample preparation and processing steps are complex and cumbersome; 3) poor selectivity; 4) low detection sensitivity; 5) poor timeliness of on-site rapid detection, etc.

Method used

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  • Preparation method of carbon quantum dot containing calcium alginate gel for detecting copper ions
  • Preparation method of carbon quantum dot containing calcium alginate gel for detecting copper ions
  • Preparation method of carbon quantum dot containing calcium alginate gel for detecting copper ions

Examples

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Effect test

Embodiment 1

[0024] A preparation method for calcium alginate gel containing carbon quantum dots for detecting copper ions, comprising the following steps:

[0025] (1) Weigh 2g of graphene and put it into a conical flask for ultrasonic treatment for 8min, then add it to 100ml of HNO with a concentration of 3mol / L 3 Reflux acid cooking in the solution for 12 hours to fully dissolve the carbon-containing substances; after natural cooling, centrifuge for 45 minutes with a centrifuge with a rotating speed of 8000r / min, and take the clear liquid to obtain fluorescent carbon quantum dots;

[0026] (2) Take 10 ml of the above-mentioned fluorescent carbon quantum dots and neutralize them with NaOH solution until the pH value is 7, dilute the neutralized fluorescent carbon quantum dots with distilled water to 100ml, add 0.3g of sodium borohydride for reduction, and stir for 12 hours. It fully reacts to obtain reduced carbon quantum dots with enhanced fluorescence;

[0027] (3) Take 32ml of the ab...

Embodiment 2

[0030] A preparation method for calcium alginate gel containing carbon quantum dots for detecting copper ions, comprising the following steps:

[0031] (1) Weigh 2g of activated carbon and put it into a conical flask for ultrasonic treatment for 9 minutes, then add 100ml of HNO with a concentration of 4mol / L 3 Reflux acid cooking in the solution for 9 hours to fully dissolve the carbon-containing substances; after natural cooling, centrifuge with a centrifuge with a speed of 10000r / min for 35min, and take the clear liquid to obtain fluorescent carbon quantum dots;

[0032] (2) Take 10 ml of the above-mentioned fluorescent carbon quantum dots and neutralize them with NaOH solution until the pH value is 7.5, dilute the neutralized fluorescent carbon quantum dots with distilled water to 100ml, add 0.35g of sodium borohydride for reduction, and stir for 8.5 h Make it react fully to obtain reduced carbon quantum dots with enhanced fluorescence;

[0033] (3) Take 50ml of the above-...

Embodiment 3

[0036] A preparation method for calcium alginate gel containing carbon quantum dots for detecting copper ions, comprising the following steps:

[0037] (1) Weigh 2g of carbon black and put it into a conical flask for ultrasonic treatment for 10min, then add it to 100ml of HNO with a concentration of 2mol / L 3 Carry out reflux acid boiling in the solution for 10 hours to fully dissolve the carbon-containing substances; after natural cooling, use a centrifuge with a speed of 9000r / min to centrifuge for 40 minutes, and take the clear liquid to obtain fluorescent carbon quantum dots;

[0038] (2) Take 10 ml of the above-mentioned fluorescent carbon quantum dots and neutralize them with NaOH solution until the pH value is 6.5, dilute the neutralized fluorescent carbon quantum dots to 100ml, add 0.32g of sodium borohydride for reduction, and stir for 10 hours to fully reaction to obtain reduced carbon quantum dots with enhanced fluorescence;

[0039] (3) Take 12.5ml of the above-men...

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Abstract

The invention relates to a detection technology of copper ions, and in particular relates to a preparation method of a reduced carbon quantum dot containing calcium alginate gel for detecting copper ions. The preparation method of the carbon quantum dot containing calcium alginate gel for detecting the copper ions comprises the following steps of: preparing fluorescent carbon quantum dots; neutralizing the fluorescent carbon quantum dots, adding sodium borohydride into the neutralized fluorescent carbon quantum dots to perform reduction; mixing deionized water with the neutralized fluorescent carbon quantum dots at equal volume, and adding sodium alginate into the mixture to obtain a sodium alginate sol; and spraying a calcium ion solution to the surface of the sol or soaking the sol into the calcium ion solution to perform crosslinking, and drying to obtain the calcium alginate gel. By using the characteristics that the carbon quantum dots have fluorescent characteristics, the fluorescence of the carbon quantum dots is enhanced after reduction, and the calcium alginate can enhance the fluorescent characteristics of the carbon quantum dots, when the copper ions are detected, the cost of an adopted fluorospectro photometer is low, the sample preparation and treatment steps are simple and easy to operate, and the detection sensitivity is high, so that the calcium alginate gel can be widely used for detecting the copper ions.

Description

technical field [0001] The invention relates to the detection technology of copper ions, in particular to a method for preparing calcium alginate gel containing reduced carbon quantum dots for detecting copper ions. Background technique [0002] Untreated or treated heavy metal elements that do not meet the GB8978-1669 "Integrated Wastewater Discharge Standard" are discharged into rivers, lakes or oceans. Not only are they not biodegradable, but they will be multiplied by thousands of times under the biological amplification of the food chain. enriched, and finally enter the human body. Heavy metals can strongly interact with proteins and enzymes in the human body, making them inactive, and may also accumulate in certain organs of the human body, causing chronic poisoning. As a heavy metal element, copper is the third most abundant transition metal element in the human body after iron and zinc; Cu 2+ An appropriate amount in the human body is beneficial to maintain the nor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J7/00C08J3/24C08L5/04C08L3/04C09K11/06G01N21/64
Inventor 胡胜亮赵清董英鸽杨金龙刘炜常青王延忠
Owner ZHONGBEI UNIV
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