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Hydrophobic modification method of sodium alginate sponge as well as product and application thereof

A technology of sodium alginate and hydrophobic modification, applied in the field of hydrophobic modification of sodium alginate sponge, can solve the problem of not having oil-water selective separation and the like, achieve good stability and durability, easy operation, and simple modification method Inexpensive and environmentally friendly

Active Publication Date: 2018-12-11
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amphoteric sodium alginate-based sponge has high adsorption capacity for both water and oil, and does not have the characteristics of selective separation of oil and water.

Method used

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  • Hydrophobic modification method of sodium alginate sponge as well as product and application thereof
  • Hydrophobic modification method of sodium alginate sponge as well as product and application thereof
  • Hydrophobic modification method of sodium alginate sponge as well as product and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 1g sodium alginate in 25mL water, pour the solution into 1.0×1.0×1.0cm 3 Sodium alginate sponge is prepared in the module, soak 1g sodium alginate sponge in 200mL 5wt% CaCl 2 Sodium alginate-calcium sponge was prepared after 4h in the solution, washed and soaked in 200mL 3wt% ZrOCl 2 ·8H 2 0 solution for 4 hours, freeze-dried after washing, and dried at 80°C to obtain a sodium alginate-calcium-zirconium sponge.

[0032] The modified sodium alginate sponge, sodium alginate-calcium-zirconium sponge, has a water wetting angle of 138.2°-143.8°. Sodium alginate-calcium-zirconium has a porosity of 81.8%.

[0033] Surface observation of hydrophobic and lipophilic properties before and after modification, see figure 2 . figure 2 It is the observation of sodium alginate sponge to oil-water adsorption before and after the modification of embodiment 1, wherein, figure 2 (a) Sodium alginate-calcium sponge before modification, drip water and soybean oil on its surf...

Embodiment 2

[0036]Taking n-hexane as an example, soak the sodium alginate-calcium-zirconium sponge sample in Example 1 in n-hexane for 1-2 minutes, then take it out and weigh it. The oil absorption is calculated by comparing the mass difference before and after oil absorption with the initial mass is the oil absorption of the sample. After each oil absorption, elute with ethanol by gently squeezing several times, and dry at 80°C for later use. The adsorption capacity of the first five times were 10.21, 7.3, 7.1, 6.5, 6.9g / g, showing excellent cycle performance.

[0037] Taking chloroform as an example, soak the sodium alginate-calcium-zirconium sponge sample in Example 1 in chloroform for 1-2 minutes, then take it out and weigh it, and calculate the oil absorption by comparing the mass difference before and after oil absorption with the initial mass. of oil absorption. After each oil absorption, elute with ethanol by gently squeezing several times, and dry at 80°C for later use. The ad...

Embodiment 3

[0039] Taking light soybean oil / water as an example, the application of modified sodium alginate-calcium-zirconium sponge in oil-water separation was tested ( Figure 4 a). For the convenience of observation, soybean oil was stained with Oil Red O. The sodium alginate-calcium-zirconium sponge sample in Example 1 was placed on the oily water surface. From the beginning to the end of the adsorption, it only took 30 seconds to completely remove the oil slick on the water surface. Exhibits excellent oil-water separation properties.

[0040] Taking heavy oil chloroform / water as an example, the application of modified sodium alginate-calcium-zirconium sponge in oil-water separation was tested ( Figure 4 b). In order to facilitate the observation of chloroform stained with Oil Red O, the sodium alginate-calcium-zirconium sponge sample in Example 1 was immersed in the bottom of the water with tweezers. From the beginning to the end of the adsorption, it only took 10 seconds to comp...

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Abstract

The invention discloses a hydrophobic modification method of sodium alginate sponge as well as a product and application thereof. The method comprises the steps: soaking the sodium alginate sponge into calcium ion solution, and then soaking in zirconium ion solution to obtain modified sodium alginate sponge. Relative to a method for hydrophobic modification of materials such as graphene, polysiloxane, organo-siloxane and a metal organic skeleton (these modification agents are high in price, toxic, and complicated in synthesis process, and are not beneficial to large-scale production and application) on the sodium alginate sponge, the porous sodium alginate sponge prepared according to the invention is simple in method, green and environmental-friendly and easy to produce in large scale. Next, sodium alginate is rich in natural resource, can replace petroleum-based sponge, and solves the problem that the current petroleum resource is scanty. Subsequently, hydrophobic three-dimensional porous sodium alginate sponge has a good adsorption effect on various oils or organic solvents, and is easy to desorb and can be repeatedly used.

Description

technical field [0001] The invention belongs to the technical field of adsorption and separation materials, and in particular relates to a method for hydrophobic modification of sodium alginate sponge and its product and application. Background technique [0002] At present, the discharge of oily sewage in petrochemical, textile, food, steel and other industries is increasing and the oil leakage accidents are frequent, causing long-term harm to the human body, animals, plants and ecological environment. One-dimensional oil-absorbing materials are not easy to recycle and have low adsorption capacity; two-dimensional membrane materials are easy to pollute, consume high energy, and have low efficiency. At present, most of the widely used three-dimensional oil-absorbing materials use commercial sponges as porous substrates, which are surface-modified for oil-water separation. Nowadays, petroleum resources are facing depletion, but natural polymer polysaccharide materials are ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C08L5/04B01J20/24B01J20/28B01J20/30B01D17/02
CPCB01D17/0202B01J20/24B01J20/28045C08J9/40C08J2305/04
Inventor 姚建峰王亚权刘洋冯艺
Owner NANJING FORESTRY UNIV
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