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A method for detecting and removing lead ions based on nanocrystalline cellulose

A nanocrystalline cellulose, lead ion technology, applied in the measurement of color/spectral properties, material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problem that lead ions cannot be removed, The operation steps are complicated, and the color developer is required to achieve the effect of easy popularization and application, simple operation and high sensitivity

Active Publication Date: 2017-06-23
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can quickly detect lead ions and has the advantages of no need for highly toxic reagents, good safety, strong anti-interference ability, and high accuracy. cannot be removed

Method used

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  • A method for detecting and removing lead ions based on nanocrystalline cellulose
  • A method for detecting and removing lead ions based on nanocrystalline cellulose
  • A method for detecting and removing lead ions based on nanocrystalline cellulose

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Embodiment 1: the influence of NCC concentration on detection result

[0038] (1) Prepare 2.5mg / mL, 5mg / mL, 10mg / mL nanocrystalline cellulose solutions and 16% acetic acid solution, take different concentrations of nanocrystalline cellulose solution 0.12mL, acetic acid solution 0.15mL and 0.21mL respectively ionized water mix;

[0039] (2) Add 0.06mL of lead ion solution to be tested in step (1) solution, mix well;

[0040] (3) Add 0.06 mL of 10 mM sodium sulfide solution to the uniformly mixed solution in step (2), react for 10 minutes, observe the color change of the solution, and then detect the absorbance at 400 nm with a UV-Vis spectrophotometer.

[0041] from figure 2It can be seen that when the concentration of NCC is low, it is not easy to disperse lead sulfide. When the concentration of NCC is high, its solubility is poor, and it is easy to produce flocculent precipitation when adding a solution containing lead ions. And observe the change of the absorption...

Embodiment 2

[0042] Embodiment 2: the influence of sodium sulfide concentration on detection result

[0043] (1) Prepare 5mg / mL nanocrystalline cellulose solution and 16% acetic acid solution, mix 0.12mL nanocrystalline cellulose solution, 0.15mL acetic acid solution and 0.21mL deionized water;

[0044] (2) Add 0.06mL of lead ion solution to be tested in step (1) solution, mix well;

[0045] (3) Prepare sodium sulfide solutions at concentrations of 5mM, 10mM, 20mM, 40mM, 60mM, 80mM and 100mM, and use them first.

[0046] (4) Then add 0.06 mL of sodium sulfide solutions of different concentrations to the uniformly mixed solution in step (2), and the final concentrations of sodium sulfide are 0.5 mM, 1 mM, 2 mM, 4 mM, 6 mM, 8 mM and 10 mM. React for 10 minutes, observe the color change of the solution, and then detect the absorbance at 400 nm with an ultraviolet-visible spectrophotometer.

[0047] The concentration and time of sodium sulfide have no significant effect on the detection resu...

Embodiment 3

[0048] Embodiment 3: the influence of reaction time on detection result

[0049] (1) Prepare 5mg / mL nanocrystalline cellulose solution and 16% acetic acid solution, mix 0.12mL nanocrystalline cellulose solution, 0.15mL acetic acid solution and 0.21mL deionized water;

[0050] (2) Add 0.06mL of lead ion solution to be tested in step (1) solution, mix well;

[0051] (3) Add 0.06mL of 10mM sodium sulfide solution to the uniformly mixed solution in step (2), react respectively for 3 minutes, 5 minutes, 10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes and 60 minutes, observe The color of the solution changes, and the absorbance value at 400 nm is detected with a UV-visible spectrophotometer.

[0052] The experimental results show that the reaction is complete when the reaction time is 10 minutes, and the reaction time is 10 minutes.

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Abstract

The invention relates to a lead ion detecting and removing method based on nanocrystalline cellulose. The method comprises the following steps: mixing a prepared nanocrystalline cellulose solution with an acetic acid solution; adding to-be-detected lead ion solution, and uniformly mixing; and adding a sodium sulfide solution, after reacting a period of time, observing the color change of the solution, and detecting at 400 nm wavelength by using an ultraviolet-visible spectrophotometer. The method disclosed by the invention has good selectivity, and the method can specifically detect lead ions; the method is quick to detect, keeps stable in a certain period of time, and a nanocrystalline cellulose is a renewable material, and is not required to be modified; the method disclosed by the invention is high in sensitivity, and the detectable lowest concentration of lead ions is 7.5 mu m; and the method is less in required reagents, simple in operation, and convenient for popularization and application.

Description

technical field [0001] The invention relates to the field of rapid detection of metal ions, in particular to a method for detecting and removing lead ions based on nanocrystalline cellulose. Background technique [0002] Lead is a stable non-degradable pollutant that can combine with functional groups (sulfhydryl groups) in proteins, enzymes and amino acids in the human body, and is a heavy metal element that seriously endangers human health. Lead can be deposited in the body, thereby affecting various physiological activities of the body. The deposited lead can hinder the formation of blood cells and lead to a decline in human intelligence; when deposited to a certain extent, it will lead to chronic poisoning such as mental disorders, nightmares, insomnia and headaches. Symptoms; what is more serious is that heavy metal lead can cause problems during pregnancy, affect the growth and intellectual development of infants and young children, neurobehavioral and brain functions ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/78
Inventor 蒋兴宇贾跃晓郭永明
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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