CN111977873B - Method for using photoactivated sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants - Google Patents

Method for using photoactivated sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants Download PDF

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CN111977873B
CN111977873B CN202010899140.2A CN202010899140A CN111977873B CN 111977873 B CN111977873 B CN 111977873B CN 202010899140 A CN202010899140 A CN 202010899140A CN 111977873 B CN111977873 B CN 111977873B
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CN111977873A (en
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阳海
张雪婷
胡倩
易兵
刘华杰
张帆
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Hunan Institute of Engineering
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/16—Regeneration of sorbents, filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/10—Photocatalysts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

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  • Environmental & Geological Engineering (AREA)
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Abstract

The invention discloses a method for using photoactivated sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants. At normal temperature, adding sepiolite into wastewater containing organic pollutants, stirring to ensure that molecules of the organic pollutants reach adsorption and desorption balance in the cavity and the surface of the sepiolite, performing solid-liquid separation in a centrifugal or filtering mode to obtain the sepiolite adsorbing the organic matters, drying, then performing light source irradiation, performing Si-OH fracture on the sepiolite under the action of a light source to generate hydroxyl radicals, further reacting the hydroxyl radicals with oxygen in the air and the like to convert active oxygen species such as oxygen anion radicals and the like, and further degrading the organic pollutants adsorbed in the cavity and the surface of the sepiolite ore to play a role in mineralizing or partially mineralizing the organic pollutants. The sepiolite added into the aqueous solution has good stability, is easy to recover and can be recycled. The method has the advantages of low cost, high treatment efficiency at normal temperature, simple operation and good industrial application value.

Description

Method for using photoactivated sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants
Technical Field
The invention relates to treatment of water-soluble organic matters, in particular to a method for using photoactivated sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants.
Background
The development of clay mineral resources such as sepiolite is a great demand for national economic development and is also an important support for economic and social development in provinces such as the Hunan, the Jiangxi and the Hebei. In recent years, the protrusions based on specific surface area and surface activityAdvantageously, sepiolite has been widely used in the fields of soil remediation, air purification, water adsorption, and the like. In the aspect of soil treatment, sepiolite has adsorption and chelation effects on heavy metals such as arsenic, cadmium, lead and the like, and is compounded with other functional additives to form a solidification net through interaction, so that the heavy metals are further enclosed in a grid net, and thus solidification and stabilization of the heavy metals such as arsenic, cadmium, lead and the like are realized. In the aspect of air purification, the sepiolite and the modified sepiolite can not only efficiently filter VOCs and SO 2 Or H 2 S, NOx and the like, and simultaneously has a strong and durable antibacterial function, and the primary filtering efficiency of PM2.5 can reach 99%. In the aspect of water body adsorption, sepiolite has extremely strong adsorption performance and ion exchange performance, and is mainly applied to adsorption and removal of heavy metals Cd and Pb in water bodies, however, with the appearance of trace organic pollutants such as dyes, antibiotics, organic pesticides and micro plastics in water bodies, the sepiolite also has related scientific research in the field of removal of organic pollutants. However, the application of sepiolite in the fields of soil heavy metal pollution treatment, air purification, sewage treatment and the like is usually limited to a large specific surface area and a high surface activity, and the photochemical reaction activity of the sepiolite on Si-OH groups is not developed and utilized. Particularly in the field of organic pollutant control, the application range of the sepiolite is greatly limited because the organic pollutants adsorbed on the surface of the sepiolite cannot be effectively mineralized and degraded. Under the action of external light source, the Si-OH group of sepiolite can generate Si-O bond homolytic cleavage to generate active oxygen species such as OH with high oxidation-reduction potential, and further lead to mineralization and degradation of organic pollutants.
Therefore, how to effectively activate the sepiolite Si-OH group to generate active oxygen species such as OH and the like and apply the active oxygen species to the field of organic pollutant control is a main technical bottleneck point for integrating the sepiolite mineral resources and widening the application range of the sepiolite mineral resources, and is also a core scientific problem which needs to be solved for promoting basic research achievements to be applied.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for using photoactivated sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants, which is to degrade the organic pollutants in an aqueous solution under the action of a 100-800 nm light source through solid/liquid interface adsorption and solid/gas interface photocatalysis, namely, a 100-800 nm light source is adopted to irradiate the sepiolite with the inner cavity and the surface of the sepiolite to achieve adsorption and desorption balance, and the sepiolite is activated by the light source to generate Si-OH bond fracture and form active oxygen species such as hydroxyl radical and the like, thereby achieving the aim of oxidatively degrading antibiotics.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for using a photoactive sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants comprises the following steps:
(1) Adding sepiolite powder into an aqueous solution containing organic pollutants at normal temperature, and stirring to ensure that the organic pollutants in the solution reach adsorption and desorption balance at a solid/liquid interface of the sepiolite, including an inner cavity and the surface of the sepiolite;
(2) After the adsorption and desorption of organic pollutants in the aqueous solution on the solid/liquid interface of the sepiolite are balanced, carrying out solid-liquid separation in a filtering or centrifugal mode to obtain sepiolite powder adsorbing the organic pollutants, and drying;
(3) The starting light intensity is 5-50 mW cm -2 The light source with the wavelength of 100-800 nm irradiates sepiolite powder absorbing organic pollutants, si-OH groups of the sepiolite in a molecular sieve form are subjected to Si-OH bond fracture under the action of a sunlight light source to generate active oxygen species such as hydroxyl radicals and the like, and therefore the organic pollutants are subjected to oxidative degradation.
Furthermore, the light source is preferably a simulated sunlight light source, and the light intensity is 5-50 mW cm -2 More preferably, the intensity of light is 50 mW cm -2 (ii) a The wavelength is 100-800 nm, more preferably 400 nm.
Further, in the step (1), the sepiolite is one or more than two of raw sepiolite ore, alpha-sepiolite powder and beta-sepiolite powder, and is preferably alpha-sepiolite powder.
Further, in the step (1), the mass-to-volume ratio of the sepiolite in the aqueous solution is 1 to 50 g/L.
Further, the organic pollutants mainly refer to water-soluble organic pollutants, including organic matters such as organic dyes, pesticides and antibiotics, and the size of the organic pollutants is less than 100 x 500 x 100 nm.
Further, in the step (1), the stirring time is 30 to 120 minutes.
Furthermore, in the step (2), the drying temperature is 40 to 60 ℃, and the drying time is 2~3 hours.
Further, in the step (3), the irradiation time is 2 to 36 hours.
Further, the method also comprises the recovery of sepiolite, and specifically comprises the following steps: after the sepiolite adsorbing the organic pollutants is subjected to photocatalytic reaction at a solid/gas interface, the sepiolite is activated at 100-200 ℃ and then is reused as an adsorbent and a catalyst.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1) Compared with the existing technology for processing organic pollutants by sepiolite, the invention activates the sepiolite Si-OH group by using the light source after the sepiolite finishes the adsorption, so that the sepiolite generates active oxygen species such as hydroxyl free radical and the like, thereby playing a synergistic action of adsorption and oxidative degradation on the degradation of organic pollutants in the water environment, greatly improving the processing efficiency of the organic pollutants and widening the application range of the sepiolite.
2) The sepiolite provided by the invention is mainly used for removing organic pollutants in a water environment, wherein the organic pollutants comprise organic dyes, pesticides, antibiotics and the like. The sepiolite has strong adaptability to water-soluble organic pollutants, good broad spectrum, and molecular size less than 100 multiplied by 500 multiplied by 100 nm organic pollutants, and has good adsorption and oxidative degradation effects.
3) The sepiolite adopted by the invention has stable structure in aqueous solution, is easy to recover, can be repeatedly recycled after being activated, and the activity can be basically kept unchanged in multiple cycles.
4) The method has the advantages of simple process flow, convenient operation, environmental protection, no secondary pollution and wide application prospect.
Detailed Description
The present invention will be further described with reference to specific examples, but the present invention is not limited thereto.
Example 1
A method for using a photoactive sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants comprises the following specific steps:
(1) Preparing 100 mu mol/L acid red 37 solution at room temperature, putting 100 ml solution into a 250 ml reactor, adding 2 g alpha-sepiolite powder, and stirring 1 h to ensure that the acid red 37 reaches adsorption and desorption balance at the solid/liquid interface of the sepiolite;
(2) Performing solid-liquid separation by adopting a filtering mode to obtain sepiolite powder adsorbed with acid red 37, and drying for 3 hours at the temperature of 50 ℃;
(3) Starting a xenon lamp to simulate a sunlight source, irradiating the dried sepiolite powder, and carrying out oxidative degradation reaction on organic pollutants at the solid/gas interface of the sepiolite for 6 hours;
(4) After the reaction is finished, the sepiolite powder is collected and activated at 150 ℃ for recycling.
Examples 2 to 4
Acid red 37 was replaced with acid yellow 17, mordant orange 1, or alizarin yellow GG, respectively.
Testing the content of the organic pollutants in the aqueous solution after the organic pollutants are adsorbed and desorbed and balanced in the step (1) to obtain the adsorption rate of the sepiolite on the organic pollutants, wherein the adsorption rate is = (C) 0 -C 1 ) /C 0 X 100% where C 0 Initial concentration of organic contaminant solution, C 1 Is the concentration of organic contaminants in the solution after equilibrium adsorption. Testing the content of the organic pollutants on the sepiolite sample subjected to the photocatalytic reaction in the step (3) to obtain the final degradation rate of the organic pollutants, wherein the degradation rate is = (C) 0 -C 1 -C 2 ) /( C 0 -C 1 ) X 100% where C 2 The concentration of organic contaminants remaining at the sepiolite interface after the photocatalytic reaction was reduced, and the experimental results are shown in table 1. The results in Table 1 show that organic dyes such as acid red 37, acid yellow 17, mordant orange 1, alizarin yellow GG and the like have good adsorption effects on the surface of sepiolite, the adsorption rate is between 85 and 91 percent, the sepiolite powder adsorbing organic pollutants reacts for 4 to 8 hours under the irradiation of a xenon lamp simulated solar light source, and the organic dyes are obtained by organic dyeingThe degradation rate of the material can reach more than 80 percent.
TABLE 1 adsorption and degradation rates of organic dyes in photoactivated sepiolite Si-OH reaction systems
Examples Organic dyes Adsorption rate Rate of degradation
Example 1 Acid Red 37 85% 85%
Example 2 Acid yellow 17 88% 85%
Example 3 Mordant orange 1 90% 82%
Example 4 Alizarin yellow GG 91% 81%
Compared with the existing sepiolite organic dye treatment technology, the method only stays in the aspect of organic dye adsorption removal, and the invention further discloses an activation method of the sepiolite Si-OH on the basis of the original adsorption technology, so that the sepiolite adsorbing organic pollutants is subjected to oxidation reaction under the irradiation of a light source, and the organic pollutants are well removed.
Example 5
A method for using a photoactive sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants comprises the following specific steps:
(1) Preparing 100 mu mol/L thiamethoxam solution at room temperature, putting 100 ml solution into a 250 ml reactor, adding 2 g alpha-sepiolite powder, and stirring 1 h to ensure that thiamethoxam achieves adsorption and desorption balance at a solid/liquid interface of sepiolite;
(2) Carrying out solid-liquid separation in a filtering mode to obtain sepiolite powder adsorbing thiamethoxam, and drying for 2 hours at the temperature of 60 ℃;
(3) Starting a xenon lamp to simulate a sunlight source, irradiating the dried sepiolite powder, and carrying out oxidative degradation reaction on organic pollutants at the solid/gas interface of the sepiolite for 6 hours;
(4) After the reaction is finished, sepiolite powder is collected and activated at 100-200 ℃ for recycling.
Examples 6 to 8
Thiamethoxam was replaced with clothianidin, carbofuran or diuron, respectively.
Testing the content of the organic pollutants in the aqueous solution after the organic pollutants are adsorbed and desorbed and balanced in the step (1) to obtain the adsorption rate of the sepiolite on the organic pollutants, wherein the adsorption rate is = (C) 0 -C 1 ) /C 0 X 100% where C 0 Initial concentration of organic contaminant solution, C 1 Is the concentration of organic contaminants in the solution after equilibrium adsorption. Testing the content of the organic pollutants on the sepiolite sample subjected to the photocatalytic reaction in the step (3) to obtain the final degradation rate of the organic pollutants, wherein the degradation rate is = (C) 0 -C 1 -C 2 ) /( C 0 -C 1 ) X 100% where C 2 The reduced concentration of organic contaminants remaining at the sepiolite interface after the photocatalytic reaction, and the experimental results are shown in table 2. The results in table 2 show that the thiamethoxam, clothianidin, carbofuran, diuron and other organic pesticides have better adsorption effect on the surface of the sepiolite, the adsorption rate is more than 85%, and the sepiolite powder adsorbing organic pollutants reacts for 4-8 hours under the irradiation of a xenon lamp simulated solar light source, so that the degradation rate of the organic pesticides can reach about 80%.
TABLE 2 adsorption and degradation rates of organic pesticides in photoactivated sepiolite Si-OH reaction systems
Examples Organic pesticide Adsorption rate Rate of degradation
Example 5 Thiamethoxam 85% 78%
Example 6 Clothianidin 86% 80%
Example 7 Carbofuran 85% 82%
Example 8 Diuron (D) 86% 81%
Compared with the existing sepiolite organic pesticide treatment technology, the method only stays in the aspect of organic pesticide adsorption removal, and the invention further discloses an activation method of the sepiolite Si-OH on the basis of the original adsorption technology, so that the sepiolite adsorbing organic pollutants generates an oxidation reaction under the irradiation of a light source, and the organic pollutants are well removed.
Example 9
A method for using a photoactive sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants comprises the following specific steps:
(1) Preparing 100 mu mol/L atenolol solution at room temperature, putting 100 ml solution into a 250 ml reactor, adding 2 g alpha-sepiolite powder, stirring 1 h, and enabling the atenolol to reach adsorption and desorption balance at a solid/liquid sepiolite interface;
(2) Performing solid-liquid separation by adopting a filtering mode to obtain sepiolite powder absorbing the atenolol, and drying for 1-2 hours at the temperature of 40-60 ℃;
(3) Starting a xenon lamp to simulate a sunlight source, irradiating the dried sepiolite powder, and carrying out oxidative degradation reaction on organic pollutants at the solid/gas interface of the sepiolite for 4-8 hours;
(4) After the reaction is finished, sepiolite powder is collected and activated at 100-200 ℃ for recycling.
Examples 10 to 12
Atenolol was replaced with sulfachlorpyridazine, ciprofloxacin or lamivudine, respectively.
Testing the content of the organic pollutants in the aqueous solution after the organic pollutants are adsorbed and desorbed and balanced in the step (1) to obtain the adsorption rate of the sepiolite on the organic pollutants, wherein the adsorption rate is = (C) 0 -C 1 ) /C 0 X 100% where C 0 Initial concentration of organic contaminant solution, C 1 Is the concentration of organic contaminants in the solution after equilibrium adsorption. Testing the content of the organic pollutants on the sepiolite sample subjected to the photocatalytic reaction in the step (3) to obtain the final degradation rate of the organic pollutants, wherein the degradation rate is = (C) 0 -C 1 -C 2 ) /( C 0 -C 1 ) X 100% where C 2 The reduced concentration of organic contaminants remaining at the sepiolite interface after the photocatalytic reaction, and the experimental results are shown in table 3. The results in table 3 show that the organic pesticides such as atenolol, sulfachlorpyridazine, ciprofloxacin and lamivudine all have good adsorption effect on the surface of sepiolite, the adsorption rate is above 85%, and the sepiolite powder adsorbing organic pollutants reacts for 4-8 hours under the irradiation of a xenon lamp simulated solar light source, so that the degradation rate of antibiotics can reach about 80%.
TABLE 3 adsorption and degradation rates of antibiotics in light-activated sepiolite Si-OH reaction systems
Examples Organic pesticide Adsorption rate Rate of degradation
Example 9 Atenolol 85% 78%
Example 10 Sulfachlor pyridazine 86% 80%
Example 11 Ciprofloxacin 85% 82%
Example 12 Lamivudine 86% 81%
Compared with the existing sepiolite antibiotic treatment technology, the invention only stays in the aspect of adsorbing and removing the antibiotics, and the invention further discloses an activation method of the sepiolite Si-OH on the basis of the original adsorption technology, so that the sepiolite adsorbing the organic pollutants generates an oxidation reaction under the irradiation of a light source, and the organic pollutants are well removed.
Example 13
A method for using a photoactive sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants comprises the following specific steps:
(1) Preparing 100 mu mol/L atenolol solution at room temperature, taking 100 ml solution to put in a 250 ml reactor, adding 2 g alpha-sepiolite powder, stirring 1 h, and enabling the atenolol to reach adsorption and desorption balance at a sepiolite solid/liquid interface;
(2) Performing solid-liquid separation by adopting a filtering mode to obtain sepiolite powder absorbing the atenolol, and drying for 1-2 hours at the temperature of 40-60 ℃;
(3) Starting a xenon lamp to simulate a sunlight source, irradiating the dried sepiolite powder, and carrying out oxidative degradation reaction on organic pollutants at the solid/gas interface of the sepiolite for 4-8 hours;
(4) After the reaction is finished, sepiolite powder is collected and used for the next batch of reaction after being activated at 100-200 ℃. Table 4 shows the change of the adsorption rate and the degradation rate of the sepiolite on 100 mu mol/L atenolol after 4 cycles, and the adsorption rate and the degradation rate of the sepiolite on the atenolol are kept unchanged.
TABLE 4 influence of sepiolite recycle on atenolol adsorption and degradation rates
Number of cycles Adsorption rate Rate of degradation
1 85% 78%
2 85% 75%
3 81% 72%
4 80% 72%
The above examples show that the sepiolite adsorbs organic pollutants and activates the sepiolite Si-OH to generate hydroxyl radicals to degrade the organic pollutants, and the sepiolite and the hydroxyl radicals act synergistically to achieve the purpose of oxidatively degrading the organic pollutants in an aqueous solution, wherein the adsorption rate of most of the organic pollutants is over 85%, and the degradation rate is about 80%. In addition, the sepiolite is easy to recover and has good recycling effect.

Claims (5)

1. A method for using a photoactive sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants is characterized by comprising the following steps:
(1) Adding sepiolite into the aqueous solution containing organic pollutants at normal temperature, and starting stirring to ensure that the organic pollutants in the aqueous solution reach adsorption and desorption balance in the inner cavity and the surface of the sepiolite; the organic pollutants comprise one or more than two of organic dyes, pesticides or antibiotics, the organic dyes are acid red 37, acid yellow 17, mordant orange 1 or alizarin yellow GG, the pesticides are thiamethoxam, clothianidin, carbofuran or diuron, the antibiotics are atenolol, sulfachlorpyridazine, ciprofloxacin or lamivudine, and the size of the organic pollutants is less than 100 x 500 x 100 nm;
(2) After the organic pollutants in the aqueous solution reach adsorption and desorption balance in the inner cavity and the surface of the sepiolite, carrying out solid-liquid separation in a filtering or centrifugal mode to obtain sepiolite powder adsorbing the organic pollutants, and drying;
(3) The starting light intensity is 50 mW cm -2 The simulated solar light source with the wavelength of 400 nm irradiates for 2-36 hours, and the sepiolite adsorbing the organic pollutants generates active oxygen species with strong oxidizing property under the action of visible light, so that the organic pollutants adsorbed on the sepiolite are oxidized and degraded;
(4) The sepiolite is recovered specifically as follows: the sepiolite powder after the organic pollutant is absorbed and degraded by photocatalysis is activated at 100-200 ℃ and then is recycled.
2. The method for adsorbing and photodegrading water-soluble organic pollutants with the photoactive sepiolite Si-OH as claimed in claim 1, wherein in the step (1), the sepiolite is one or more of raw sepiolite ore, alpha-sepiolite powder and beta-sepiolite powder.
3. The method for adsorbing and photodegrading water-soluble organic pollutants with the photoactive sepiolite Si-OH as claimed in claim 1 or 2, wherein in the step (1), the mass-to-volume ratio of the sepiolite in the aqueous solution is 1 to 50 g/L.
4. The method for adsorbing and photodegrading water-soluble organic pollutants with the photoactive sepiolite Si-OH as claimed in claim 3, wherein the stirring time in the step (1) is 30 to 120 minutes.
5. The method for adsorbing and photodegrading water-soluble organic pollutants with the photoactive sepiolite Si-OH as claimed in claim 3, wherein in the step (2), the drying temperature is 40 to 60 ℃ and the drying time is 2~3 hours.
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