Photocatalytic composite gel bead and preparation method as well as application thereof

A composite gel and photocatalysis technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problems of titanium dioxide leakage and gel stability reduction. , to achieve the effect of short production cycle, rapid preparation, simple preparation process and operation

Inactive Publication Date: 2013-06-26
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the calcium ions in this gel are easily replaced by hydrogen ions or other metal ions, resulting in a decrease in the stability of the gel, which in turn leads to leakage of the loaded titanium dioxide.

Method used

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  • Photocatalytic composite gel bead and preparation method as well as application thereof
  • Photocatalytic composite gel bead and preparation method as well as application thereof
  • Photocatalytic composite gel bead and preparation method as well as application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A photocatalytic composite gel pellet according to the invention, the gel pellet uses alginate as a carrier, and titanium dioxide nanoparticles are loaded on the carrier. The photocatalytic composite gel beads are prepared by the following method:

[0025] 1.5 g of sodium alginate and 1.5 g of titanium dioxide were mixed with water to prepare 100 mL of a mixture. The mixture was added dropwise to 400 mL of 4% calcium chloride solution with a syringe to prepare pellets with uniform particles, reacted at room temperature for 4 hours, collected the pellets and washed several times to obtain a stable gel small ball. Then add the gel beads into 200 mL of an aqueous solution of 1% glutaraldehyde and 0.1 mol / L hydrochloric acid, stir and react at 40°C for 4 hours, collect and wash the gel beads The product was obtained after several times.

[0026] The digital photos of the photocatalytic composite gel beads made above are as follows: figure 1 As shown, its appearance is w...

Embodiment 2

[0028] The photocatalytic composite gel pellet of the present invention is used for photodegradation of hexavalent chromium ions in wastewater, comprising the following steps:

[0029] The photocatalytic composite gel beads prepared in Example 1 were added to 1 L of hexavalent chromium wastewater with an initial concentration of 10 mg / L. 10 g by weight, with HNO 3 or NaOH to adjust the pH value of the wastewater, and prepare five wastewater samples to be treated with a pH range of 2 to 6, insert an 8W UV lamp tube with a quartz glass shell in the middle of the reaction vessel, and place the reaction vessel in In an incubator at a temperature of 25°C, after 15 hours of magnetic stirring, the gel beads are separated from the wastewater, and the degradation treatment of hexavalent chromium ions in the wastewater is completed. Measure the amount of undegraded hexavalent chromium in the waste water with ultraviolet spectrophotometry, and the calculated removal rate results are sho...

Embodiment 3

[0034] The photocatalytic composite gel pellet of the present invention is used for photodegradation of hexavalent chromium ions in wastewater, comprising the following steps:

[0035] The photocatalytic composite gel beads prepared in Example 1 were added to the hexavalent chromium wastewater with a volume of 1 L and the initial pH value was 2. The initial concentrations of hexavalent chromium ions were 5, 10, and 20 mg / L, respectively. The amount added in 1 liter of waste water is 10 g based on the wet weight of photocatalytic composite gel beads. Insert an 8W ultraviolet lamp tube with a quartz glass shell in the middle of the reaction vessel, and place the reaction vessel at a temperature of 25°C for cultivation. In the box, after 15 hours of magnetic stirring, the gel beads are separated from the wastewater, and the degradation treatment of hexavalent chromium ions in the wastewater is completed. Measure the amount of undegraded hexavalent chromium in the waste water with...

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Abstract

The invention relates to a photocatalytic composite gel bead and a preparation method as well as an application of the gel bed. The composite bead takes crosslinked alginate as a matrix, and the matrix is filled with titanium dioxide nanometer particles. The preparation method specifically comprises the following steps of: firstly mixing the titanium dioxide, the alginate and water uniformly, dropwise adding the mixed solution into a calcium chloride solution by using an injector to prepare uniform beads, collecting and washing the beads, adding the washed beads into a solution of glutaraldehyde and hydrochloric acid to carry out a crosslinking reaction, and finally collecting and washing the beads to obtain the final product. The product has the advantages of low cost, simple preparation, good light degradation effect, easy separation and recycling and the like, has a good light degradation effect on hexavalent chromium, and can be applied to the treatment of chromium containing wastewater discharged from an electroplating factory, an electronic equipment factory, a metallurgical refinery and the like.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and water treatment new technologies, and in particular relates to a photocatalytic composite gel bead and its preparation method and application. Background technique [0002] Water heavy metal pollution is a serious environmental pollution problem. Chromium is a relatively common heavy metal. It is mainly used in electroplating, leather and anti-corrosion industries. These factories discharge a large amount of chromium-containing wastewater every year. If it is not treated effectively before it is discharged into natural water bodies, it will cause major environmental pollution accidents. . Chromium exists mainly in two forms of trivalent and hexavalent in water. Hexavalent chromium is highly mobile in water, and its toxicity is 100 times higher than that of trivalent chromium. However, trivalent chromium is easily removed by forming precipitates with hydroxide plasma. At pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38C02F1/32C02F1/62C02F1/70C02F101/22
Inventor 胡新将刘云国王慧刘韵琴柳思勉郭一明何缘李江李婷婷
Owner HUNAN UNIV
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