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Nanometer cellulose-salicylic aldehyde thiosemicarbazone-polyvinyl alcohol hydrogel fluorescence probe, and preparation method and applications thereof

A technology of salicylaldehyde thiosemicarbazone and nanocellulose, which is applied in the field of polymer composite materials, can solve the problems of lack of mechanical properties, and achieve the effects of increasing mechanical properties, being easy to carry, having biocompatibility and easy degradability

Active Publication Date: 2019-05-31
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no nanocellulose-salicylaldehyde thiosemicarbazone-polyvinyl alcohol hydrogel fluorescent probe with good mechanical properties and the ability to detect heavy metal ions on the market.

Method used

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  • Nanometer cellulose-salicylic aldehyde thiosemicarbazone-polyvinyl alcohol hydrogel fluorescence probe, and preparation method and applications thereof
  • Nanometer cellulose-salicylic aldehyde thiosemicarbazone-polyvinyl alcohol hydrogel fluorescence probe, and preparation method and applications thereof
  • Nanometer cellulose-salicylic aldehyde thiosemicarbazone-polyvinyl alcohol hydrogel fluorescence probe, and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Example 1 Preparation of nanocellulose-salicylaldehyde thiosemicarbazone-polyvinyl alcohol composite hydrogel fluorescent probe

[0070] PB-TOCN-SHAT-I (TOCN concentration 0.5wt%, SHAT 0.001g)

[0071] Step 1, the cellulose is prepared into TOCN through chemical and mechanical treatment, and the specific method steps include:

[0072] (1) Chemical treatment method:

[0073] 1) Weigh 0.033g of TEMPO, add 0.33g of NaBr into 400mL of deionized water in turn, and stir the above mixture fully with a magnetic stirrer at 10°C; after TEMPO and NaBr are completely dissolved, add 2g of crushed bleached wood pulp fiber powder;

[0074] 2) Stir vigorously until the cellulose is uniformly dispersed, then add 21.27 g of NaClO solution to the system, and continuously drop 0.5 mol L-1 NaOH solution to control the pH of the reaction system at about 10 to obtain an oxidized cellulose suspension;

[0075] 3) After reacting for 6 hours, filter the oxidized cellulose suspension, and wash...

Embodiment 2

[0087] Example 2 Preparation of nanocellulose-salicylaldehyde thiosemicarbazone-polyvinyl alcohol composite hydrogel fluorescent probe

[0088] PB-TOCN-SHAT-Ⅱ (TOCN concentration 0.5wt%, SHAT 0.005g)

[0089] Step 1, the cellulose is prepared into TOCN through chemical and mechanical treatment, and the specific method steps include:

[0090] (1) Chemical treatment method:

[0091] 1) Weigh 0.033g of TEMPO, add 0.33g of NaBr into 400mL of deionized water in turn, and stir the above mixture fully with a magnetic stirrer at 10°C; after TEMPO and NaBr are completely dissolved, add 2g of crushed bleached wood pulp fiber powder;

[0092] 2) Stir vigorously until the cellulose is uniformly dispersed, then add 21.27 g of NaClO solution to the system, and continuously drop 0.5 mol L-1 NaOH solution to control the pH of the reaction system at about 10 to obtain an oxidized cellulose suspension;

[0093] 3) After reacting for 6 hours, filter the oxidized cellulose suspension, and wash...

Embodiment 3

[0105] Example 3 Preparation of nanocellulose-salicylaldehyde thiosemicarbazone-polyvinyl alcohol composite hydrogel fluorescent probe

[0106] PB-TOCN-SHAT-Ⅲ (TOCN concentration 0.5wt%, SHAT 0.01g)

[0107] Step 1, the cellulose is prepared into TOCN through chemical and mechanical treatment, and the specific method steps include:

[0108] (1) Chemical treatment method:

[0109] 1) Weigh 0.033g of TEMPO, add 0.33g of NaBr into 400mL of deionized water in turn, and stir the above mixture fully with a magnetic stirrer at 10°C; after TEMPO and NaBr are completely dissolved, add 2g of crushed bleached wood pulp fiber powder;

[0110] 2) Stir vigorously until the cellulose is uniformly dispersed, then add 21.27 g of NaClO solution to the system, and continuously drop 0.5 mol L-1 NaOH solution to control the pH of the reaction system at about 10 to obtain an oxidized cellulose suspension;

[0111] 3) After reacting for 6 hours, filter the oxidized cellulose suspension, and wash ...

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Abstract

The invention belongs to the field of high molecular composite material, and discloses a nanometer cellulose-salicylic aldehyde thiosemicarbazone-polyvinyl alcohol hydrogel fluorescence probe, and a preparation method and applications thereof. According to the preparation method, fluorescence probe salicylic aldehyde thiosemicarbazone is constructed into crosslinking reversible hydrogel, so that rapid, rapid, and sensitive detection of heavy metal ions in water environment is realized, a problem of conventional fluorescence probes that the conventional fluorescence probes are not convenient tocarry is solved. The application prospect of the hydrogel fluorescence probe in the field of detection of heavy metal ions in water environment is promising.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and in particular relates to a nanocellulose-salicylaldehyde thiosemicarbazone-polyvinyl alcohol hydrogel fluorescent probe and a preparation method and application thereof. Background technique [0002] At present, common traditional detection methods for heavy metals include: electrochemical analysis, atomic absorption spectroscopy (AAS), inductively coupled plasma mass spectrometry (ICP-MS), inductively coupled plasma atomic emission spectrometry (ICP-AES), voltammetry, Colorimetry, UV Spectroscopy. These traditional detection methods have high sensitivity, but the detection time is long and the operation is cumbersome. The fluorescent indicator of the probe is usually some molecules with aromatic structure, these fluorescent molecules will produce fluorescence under the excitation of light of a specific wavelength or the presence of certain substances will quench the fluorescent pr...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/24C08L29/04C08L1/04C08K3/38C08K5/405C08B15/02
Inventor 岳一莹顾佳敏韩景泉蒋剑春梅长彤王先慧
Owner NANJING FORESTRY UNIV
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