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Preparation and application for nanometer SiO2 strengthened calcium alginate-xanthan gum composite absorbent

A calcium alginate and composite adsorption technology, which is applied in the fields of alkali metal compounds, adsorption water/sewage treatment, inorganic chemistry, etc., can solve the problems that are not suitable for actual operation, storage and transportation, easy to break, and limit the water purification process. Solid-liquid separation, reduced dissolution, fast effect

Inactive Publication Date: 2012-09-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is worth pointing out that the corresponding calcium alginate microspheres are actually applied to the adsorption and removal of heavy metal ions in water, and their spatial structure is rich in water, which is easy to break and is not suitable for actual operation, storage and transportation, which significantly limits its practical application. Water purification process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Prepare 2% sodium alginate solution (mass percentage):

[0029] Add 200ml of deionized water to the glass beaker, add 4.00g of sodium alginate, put it on an electric stirrer, and stir at a speed of 500r / min until the solution is fully mixed, and then ultrasonically for 3 minutes to remove possible air bubbles in the solution .

[0030] (2) Prepare 1% xanthan gum solution (mass percentage):

[0031] Add 200ml of deionized water and 2.00g of xanthan gum into the glass beaker in advance, then place it on an electric stirrer, stir at a speed of 500r / min until the solution is fully mixed, and then ultrasonically remove possible air bubbles in the solution for 3 minutes .

[0032] (3) Prepare 0.2mol / LCaCl 2 Solution:

[0033] Weigh 22.20gCaCl 2 Put it in a glass beaker, add secondary deionized water, fully stir it with a glass rod to dissolve it, transfer it to a 1000ml volumetric flask, use secondary deionized water to make up to 0.2mol / LCaCl 2 solution.

[0034] ...

Embodiment 2

[0046] (1) Prepare 0.5% xanthan gum solution (mass percentage):

[0047] Add 200ml of deionized water and 1.00g of xanthan gum into the glass beaker in advance, then place it on an electric stirrer, stir at a speed of 500r / min until the solution is fully mixed, and then ultrasonically for 3 minutes to remove possible air bubbles in the solution .

[0048] (2) Step (1) in Example 1 prepares 2% sodium alginate solution, and step (3) prepares 0.2mol / LCaCl 2 solution.

[0049] (3) Preparation of 2% calcium alginate-0.5% xanthan gum microspheres by cross-linking method:

[0050] Prepare 2% sodium alginate solution and 0.2mol / LCaCl according to step (1) and step (3) in Example 1 respectively 2 solution. Mix the 2% sodium alginate solution with the 1% xanthan gum solution prepared in step (1) of this example, place it on an electric stirrer, and stir at a speed of 500 r / min until the solution is fully mixed. At a flow rate of 2ml / min, 200ml of 0.2mol / L CaCl was added dropwise to...

Embodiment 3

[0056] (1) Prepare 0.2% xanthan gum solution (mass percentage):

[0057] Add 200ml of deionized water and 0.50g of xanthan gum into the glass beaker in advance, then place it on an electric stirrer, stir at a speed of 500r / min until the solution is fully mixed, and then ultrasonically remove possible air bubbles in the solution for 3 minutes .

[0058] (2) Preparation of 2% calcium alginate-0.2% xanthan gum microspheres by cross-linking method:

[0059] Prepare 2% sodium alginate solution and 0.2mol / LCaCl according to step (1) and step (3) in Example 1 respectively 2 solution. Mix the 2% sodium alginate solution with the 0.2% xanthan gum solution prepared in step (1) of this example, place it on an electric stirrer, and stir at a speed of 500 r / min until the solution is fully mixed. At a flow rate of 2ml / min, 200ml of 0.2mol / L CaCl was added dropwise to the sodium alginate-xanthan gum mixed solution through a peristaltic pump with an inner diameter of 2.0mm. 2 In the solut...

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Abstract

The invention discloses preparation and application for a nanometer SiO2 strengthened calcium alginate-xanthan gum composite absorbent. At first, calcium alginate-xanthan gum composite microballoon spheres are prepared by a cross-linking method, nanometer SiO2 is led into the calcium alginate-xanthan gum composite microballoon spheres by a sol-gel method, and accordingly the absorbent is prepared. The specific surface area of the absorbent is large, solid and liquid separation is easy, the mechanical strength of the corresponding microballoon spheres can be effectively improved after the microballoon spheres are modified and strengthened by the nanometer SiO2, the problem that the microballoon spheres are expanded after absorbing water is solved, digestion of calcium ions of the microballoon spheres is controlled to be reduced, preparation cost is low, and preparation is green and safe. The microballoon spheres are actually applied to absorbing and removing heavy metal pollutants, the utilization quantity of the microballoon spheres is low, selectivity and absorption removal rate are high, operation is simple, convenient and fast, and the microballoon spheres can be regenerated and recycled. 0.07g of microballoon spheres can absorb and remove 20ml, 2mg / lPb2+ of artificial waste water, and lead removal rate is higher than 90%.

Description

technical field [0001] The invention relates to the technical field of water body purification, in particular to a nano-SiO used for water body purification 2 Preparation method and application of strengthened calcium alginate-xanthan gum composite microsphere adsorbent. Background technique [0002] With the rapid development of industry and agriculture in recent years, the problem of heavy metal pollution in the environment has become increasingly serious, seriously threatening people's health. At present, adsorption technology is a widely used heavy metal purification method, but the corresponding adsorbent materials generally have large resource investment and high cost in the preparation process, difficult recycling and recycling, and easy to cause "bottlenecks" such as secondary pollution. Therefore, the development of low-cost, environmentally friendly, safe, non-toxic, and recyclable new adsorbent materials is of great significance for the protection of ecological e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 徐芳张珊彭晓丽张闻中牛明杰王晶莹王德举
Owner SHANGHAI JIAO TONG UNIV
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