Method for preparing fluorescent nitrogen-doped carbon nanodots from compost humic acid and application thereof

A technology of nitrogen-doped carbon and humic acid, applied in nanotechnology, nanotechnology, fluorescence/phosphorescence, etc., can solve the problems of poor fluorescence properties, uneconomical, low sensitivity, etc., achieve high-value resource utilization, reduce secondary Secondary pollution, to achieve the effect of turning waste into treasure

Inactive Publication Date: 2020-09-15
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The carbon nano-dots invented by the patent CN106629663A pair Fe 3+ The detection limit is 52nmol/L, and in Cu 2+ In the presence of the environment, its effect on Fe 3+ The detection will be affected by Cu 2+ Interference, indicating that the f

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  • Method for preparing fluorescent nitrogen-doped carbon nanodots from compost humic acid and application thereof
  • Method for preparing fluorescent nitrogen-doped carbon nanodots from compost humic acid and application thereof
  • Method for preparing fluorescent nitrogen-doped carbon nanodots from compost humic acid and application thereof

Examples

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Effect test

Embodiment 1

[0044] Embodiment 1: the preparation method of synthesizing a kind of blue fluorescent nitrogen-doped carbon nano-dot with sludge and dead leaf compost product of the present embodiment as raw material, carries out according to the following steps:

[0045] (1) Weighing 0.065g humic acid, according to the mass ratio of humic acid and hydrogen peroxide is 1:7.7 to calculate the quality of hydrogen peroxide is 0.5005g, choose the hydrogen peroxide mass fraction to be 7.5% hydrogen peroxide aqueous solution , weighed 6.673g of the hydrogen peroxide aqueous solution, mixed the weighed humic acid and hydrogen peroxide aqueous solution at room temperature, carried out hydrothermal reaction at 100°C for 2h, and then naturally cooled to room temperature to obtain the reaction solution;

[0046] (2) Ultrasound the reaction solution for 15 minutes at room temperature, the ultrasonic frequency is 40kHz, and the intensity is 2.0W / cm 2 , and centrifuged at 15000r / min for 15min to separate ...

Embodiment 2

[0059] Embodiment 2: the preparation method of synthesizing a kind of blue fluorescent nitrogen-doped carbon nano-dot with sludge and dead leaf compost product of the present embodiment as raw material, carries out according to the following steps:

[0060] (1) Weighing 0.10g humic acid, according to the mass ratio of humic acid and hydrogen peroxide is 1:6.6 to calculate the quality of hydrogen peroxide is 0.66g, choose the hydrogen peroxide mass fraction to be 8.0% hydrogen peroxide aqueous solution , Weigh 8.25 g of the aqueous hydrogen peroxide solution. Mix the weighed humic acid and aqueous hydrogen peroxide solution uniformly at room temperature, conduct a hydrothermal reaction at 80°C for 10 hours, and then cool naturally to room temperature to obtain a reaction solution;

[0061] (2) Ultrasonic the reaction liquid at room temperature for 12min, the ultrasonic frequency is 30kHz, and the intensity is 1.5W / cm 2 , centrifuged at 12000r / min for 12min to separate the supe...

Embodiment 3

[0070] Embodiment 3: the preparation method of synthesizing a kind of blue fluorescent nitrogen-doped carbon nano-dot with sludge and dead leaf compost product of the present embodiment as raw material, carries out according to the following steps:

[0071] (1) weigh 0.145g humic acid, according to the mass ratio of humic acid and hydrogen peroxide is 1:5.8 the quality of calculating hydrogen peroxide is 0.841g, choose the hydrogen peroxide mass fraction to be 8.5% hydrogen peroxide aqueous solution , Weigh 9.894 g of the aqueous hydrogen peroxide solution. Mix the weighed humic acid and aqueous hydrogen peroxide solution uniformly at room temperature, conduct a hydrothermal reaction at 120°C for 6 hours, and then cool naturally to room temperature to obtain a reaction solution;

[0072] (2) Ultrasound the reaction solution at room temperature for 10 minutes, the ultrasonic frequency is 10kHz, and the intensity is 1.0W / cm 2 , and centrifuged at 10000r / min for 10min to separat...

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Abstract

The invention relates to a method for preparing fluorescent nitrogen-doped carbon nanodots by taking compost humic acid as a raw material. The preparation method comprises the following steps: uniformly mixing humic acid and a hydrogen peroxide aqueous solution at room temperature, carrying out hydrothermal reaction, and naturally cooling to room temperature to obtain a reaction solution; carryingout ultrasonic treatment, centrifugation and separation on the reaction liquid at room temperature to obtain supernatant; enabling the supernatant to pass through a water system microporous filter membrane, dialyzing, intercepting to obtain a carbon nano point aqueous solution with the molecular weight of more than 3500Da, and freeze-drying to obtain the solid nitrogen-doped carbon nanodots. According to the invention, high-value recycling of sludge can be realized, and the provided nitrogen-doped carbon nanodot synthesis method is convenient, green and efficient. The prepared nitrogen-dopedcarbon nanodot has high quantum dot yield and high fluorescence emission and can be applied to rapid detection of metal ions, and shows high selectivity and sensitivity for detection of Fe < 3 + >, and the Fe < 3 + > detection effect can be visualized by using an induction strip of a nitrogen-doped carbon nanodot matrix.

Description

technical field [0001] The invention relates to carbon nanomaterials, specifically a preparation method for synthesizing a blue fluorescent nitrogen-doped carbon nanodot from compost humic acid, and its application to Fe 3+ detection. Background technique [0002] As a new class of environmentally friendly carbon nanomaterials, carbon nanodots have excellent optical properties. Compared with traditional semiconductor quantum dots and organic fluorescent dyes, carbon nanodots have the advantages of high water solubility, low toxicity, high photostability, easy synthetic modification and good biocompatibility. Generally, there are two routes for preparing carbon nanodots: top-down and bottom-up. The top-down method mainly "transforms" large-scale carbon sources into carbon nanoparticles through physical and chemical methods. The top-down method often uses abundant natural biomass as raw material, so it is greener and more economical than the bottom-up method. [0003] Pate...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y30/00G01N21/64
CPCC09K11/65B82Y30/00G01N21/643G01N21/6447G01N2021/6432
Inventor 鲍颖朱艳梁培华侯宝红谢闯
Owner TIANJIN UNIV
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