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Method for applying photoactive sepiolite Si-OH to adsorption and photodegradation of water-soluble organic pollutants

A technology of organic pollutants and sepiolite, applied in water pollutants, light water/sewage treatment, water/sewage treatment, etc., can solve the limitation of application scope of mineralization and degradation, and the Si-OH-based photochemical reactivity has not yet been exploited and utilized. , specific surface area and high surface activity, etc., to achieve the effects of stable structure, easy recovery and simple process flow

Active Publication Date: 2020-11-24
HUNAN INSTITUTE OF ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of sepiolite in the fields of soil heavy metal pollution control, air purification and sewage treatment is often limited to its large specific surface area and high surface activity, while the photochemical reactivity of its Si-OH group has not been developed yet.
Especially in the field of organic pollutant control, the organic pollutants adsorbed on the surface of sepiolite cannot be effectively mineralized and degraded, which greatly limits its application range.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for photoactivating sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants, the specific steps are as follows:

[0026] (1) Prepare 100 μmol / L Acid Red 37 solution at room temperature, take 100 ml of the solution in a 250 ml reactor, add 2 g of α-sepiolite powder, and stir for 1 h, so that Acid Red 37 is solidified in the sepiolite / The liquid interface reaches adsorption-desorption equilibrium;

[0027] (2) Separation of solid and liquid by filtration to obtain sepiolite powder adsorbed with Acid Red 37, and dry at 50°C for 3 hours;

[0028] (3) Turn on the xenon lamp to simulate the sunlight light source, irradiate the dried sepiolite powder, and make the organic pollutants oxidize and degrade at the sepiolite solid / air interface for 6 hours;

[0029] (4) After the reaction is over, collect the sepiolite powder and activate it at 150°C for recycling.

Embodiment 2 to 4

[0031] Replace Acid Red 37 with Acid Yellow 17, Mordant Orange 1 or Alizarin Yellow GG, respectively.

[0032] In step (1), the organic pollutant content in the aqueous solution after organic pollutant adsorption and desorption equilibrium is tested to obtain the adsorption rate of sepiolite to organic pollutants, adsorption rate = (C 0 -C 1 ) / C 0 ×100%, where C 0 The initial concentration of organic pollutant solution, C 1 is the concentration of organic pollutants in the solution after adsorption equilibrium. Carry out the content test of organic pollutants to the sepiolite sample after the photocatalytic reaction in step (3) to get the degradation rate of final organic pollutants, degradation rate=(C 0 -C 1 -C 2 ) / ( C 0 -C 1 )×100%, where C 2 is the reduced concentration of organic pollutants remaining on the sepiolite interface after the photocatalytic reaction. The experimental results are shown in Table 1. The results in Table 1 show that organic dyes such as...

Embodiment 5

[0036] A method for photoactivating sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants, the specific steps are as follows:

[0037] (1) Prepare a 100 μmol / L thiamethoxam solution at room temperature, take 100 ml of the solution in a 250 ml reactor, add 2 g of α-sepiolite powder, and stir for 1 h, so that thiamethoxam is solidified in the sepiolite / The liquid interface reaches adsorption-desorption equilibrium;

[0038] (2) Separation of solid and liquid by filtration to obtain sepiolite powder adsorbed with thiamethoxam, and dry at 60°C for 2 hours;

[0039] (3) Turn on the xenon lamp to simulate the sunlight light source, irradiate the dried sepiolite powder, and make the organic pollutants oxidize and degrade at the sepiolite solid / air interface for 6 hours;

[0040] (4) After the reaction is over, collect the sepiolite powder and recycle it after activation at 100-200 °C.

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Abstract

The invention discloses a method for applying photoactive sepiolite Si-OH to adsorption and photodegradation of water-soluble organic pollutants. The method comprises the following steps of adding sepiolite into wastewater containing organic pollutants at the normal temperature, performing stirring to enable organic pollutant molecules to reach adsorption and desorption balance in an inner cavityand on the surface of the sepiolite, performing solid-liquid separation in a centrifugal or filtering manner to obtain organic matter adsorbed sepiolite, performing drying, then performing light source irradiation for enabling the sepiolite to generate Si-OH breakage under the action of a light source to generate hydroxyl radicals, further reacting the hydroxyl radicals with oxygen and the like inair to convert oxygen negative ion radicals and other active oxygen species, and then degrading the organic pollutants adsorbed to the inner cavity and the surface of the sepiolite, so that the effect of mineralizing or partially mineralizing the organic pollutants is achieved. The sepiolite added into an aqueous solution is good in stability, easy to recycle and recyclable. The method has the advantages of low cost, high treatment efficiency at the normal temperature, simplicity in operation and good industrial application value.

Description

technical field [0001] The invention relates to the treatment of water-soluble organic matter, in particular to a method for the adsorption and photodegradation of water-soluble organic pollutants by photoactive sepiolite Si-OH. Background technique [0002] The development of clay mineral resources such as sepiolite is a major demand for national economic development, and it is also an important support for the economic and social development of local provinces such as Hunan, Jiangxi and Hebei. In recent years, based on its outstanding advantages in specific surface area and surface activity, sepiolite has been widely used in fields such as soil treatment, air purification and water adsorption. In terms of soil treatment, sepiolite has adsorption and chelation effects on heavy metals such as arsenic, cadmium, and lead. By compounding other functional additives, the solidified network formed by their interaction can further seal heavy metals in the lattice network, thereby a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/30
CPCC02F9/00C02F1/281C02F1/001C02F1/38C02F1/30C02F1/725C02F2101/30C02F2305/023C02F2305/10C02F2303/16Y02W10/37
Inventor 阳海张雪婷胡倩易兵刘华杰张帆
Owner HUNAN INSTITUTE OF ENGINEERING
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