CN109226240B - Catalytic type contaminated soil remediation device - Google Patents
Catalytic type contaminated soil remediation device Download PDFInfo
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- CN109226240B CN109226240B CN201811211538.1A CN201811211538A CN109226240B CN 109226240 B CN109226240 B CN 109226240B CN 201811211538 A CN201811211538 A CN 201811211538A CN 109226240 B CN109226240 B CN 109226240B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
Abstract
The invention relates to a catalytic contaminated soil remediation device, which comprises a semi-closed shell, a driving motor, a control device, a turning screw and an excitation lamp tube, wherein the semi-closed shell is in a shape with one open end, a cavity with an opening is arranged on the inner side wall of the semi-closed shell, activated carbon and photocatalyst are sequentially arranged in the cavity along the opening direction, a breathable film, a photocatalytic layer and a non-woven fabric layer are sequentially arranged at the top of the semi-closed shell from top to bottom, the turning screw comprises a rotating shaft, a heating sleeve and a spiral turning blade, the spiral turning blade is covered with a photocatalyst coating, the turning screw is driven by the driving motor, the excitation lamp tube is arranged on the inner side wall of the semi-closed shell, and the driving motor, the heating sleeve and the excitation lamp tube are respectively and electrically connected with the control device, so that the device has high automation degree and can catalyze and degrade organic pollutants in soil while loosening the soil, and (5) repairing soil.
Description
Technical Field
The invention relates to the technical field of soil purification, in particular to a catalytic type polluted soil remediation device.
Background
The organic substances causing soil pollution mainly comprise organic pesticides, phenols, cyanides, petroleum, synthetic detergents, benzopyrene, harmful microorganisms brought by municipal sewage, sludge and animal manure, and the like. When the soil contains excessive harmful substances and exceeds the self-cleaning capacity of the soil, the composition, the structure and the function of the soil are changed, the microbial activity is inhibited, the harmful substances or decomposition products thereof are gradually accumulated in the soil and are indirectly absorbed by the human body through soil-plants-human body or soil-water-human body, the health of the human body is harmed, and the polluted soil treatment and restoration plan is formulated and developed in many countries in the world, particularly developed countries.
The soil remediation is a technical measure which utilizes physical, chemical and biological methods to transfer, absorb, degrade and transform pollutants in soil to reduce the concentration of the pollutants to an acceptable level, or transform toxic and harmful pollutants into harmless substances, changes the existing form of the pollutants in the soil or the combination mode of the pollutants and the soil, reduces the mobility and bioavailability of the pollutants in the environment, reduces the concentration of the harmful substances in the soil, and restores the normal functions of the polluted soil, and the soil remediation technology can be roughly divided into three methods, namely physical, chemical and biological methods, wherein the biological method comprises phytoremediation, original/ectopic bioremediation, is low in cost, but long in time consumption and limited in application conditions; the chemical method comprises leaching, oxidation and the like, is easy to operate, but has the problems of high cost and secondary pollution; the physical method is mainly thermal repairing, and has good efficiency but high cost.
Photocatalytic degradation is a new deep soil chemical remediation technology, is easy to operate, has no secondary pollution problem, and has great potential application value, but a single photosensitizer has the defects of poor visible light response performance, unsatisfied chemical adsorption performance of certain reactants, and the like.
Disclosure of Invention
The invention aims to provide a catalytic type polluted soil remediation device to solve the problems.
The embodiment of the invention provides a catalytic type polluted soil remediation device, which comprises a semi-closed shell, a driving motor, a control device, a turnover screw rod and an excitation lamp tube, wherein the semi-closed shell is in a shape with one open end, the driving motor and the control device are arranged on one outer side wall of the semi-closed shell, a cavity with an opening is arranged on the inner side wall of the semi-closed shell, activated carbon and a photocatalyst are sequentially arranged in the cavity along the opening direction, the cavity is sealed by non-woven fabrics, a breathable film, a photocatalytic layer and a non-woven fabric layer are sequentially arranged at the top of the semi-closed shell from top to bottom, the turnover screw rod comprises a rotating shaft, a heating sleeve and a spiral turnover blade, the heating sleeve is fixedly arranged outside the rotating shaft, the spiral turnover blade is arranged outside the heating sleeve, the spiral turnover blade is covered with a photocatalyst coating, and two ends of the turnover screw rod are longitudinally connected with a, the driving part is driven by a driving motor, the exciting lamp tube is arranged on the inner side wall of the semi-closed shell, and the driving motor, the heating sleeve and the exciting lamp tube are respectively and electrically connected with the control device;
preferably, the exciting lamp tube is a xenon lamp or an ultraviolet lamp;
preferably, the breathable film is made of PP or PVC;
preferably, the photocatalytic layer is an aluminum mesh structure, and the inside of the photocatalytic layer is filled with a photocatalyst;
further preferably, the photocatalyst is an indium tin double-metal layered hydroxide, and comprises the indium tin double-metal layered hydroxide, and platinum nanoparticles and indium tin metal oxide loaded on the surface of the indium tin double-metal layered hydroxide.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
the invention is characterized in that a heating sleeve is fixedly arranged outside a rotating shaft to heat polluted soil, so that organic pollutants are volatilized, and are subjected to a catalytic oxidation degradation process with a top photocatalytic layer and a photocatalyst in a cavity under the irradiation of an exciting lamp tube; the stirring screw rod is arranged outside the heating sleeve to stir polluted soil, so that the loosening effect on the soil is achieved, the contact between the polluted soil and the photocatalyst coating on the spiral stirring blade is increased, the degradation of pollutants which are not easy to volatilize is promoted, and the soil remediation efficiency is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic diagram of the present invention.
Reference numerals: 1-a semi-closed housing; 2-a cavity; 3, lighting a lamp tube; 4-a rotating shaft; 5-heating the sleeve; 6-spiral turning blade; 7-driving a motor; 8-a control device; 9-a gas permeable membrane; 10-a photocatalytic layer; 11-non-woven fabric layer.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Along with the improvement of urbanization and industrialization level, the volatile organic compounds are volatilizedThe problem of air organic pollution mainly caused by Volatile Organic Compounds (VOCs) is more serious, and the volatile organic compounds are called VOCs for short and are used for removing CO2、CO、H2CO3The carbon-containing compounds except the metal carbide, the metal carbonate and the ammonium carbonate which participate in the photochemical reaction have wide sources and strong pollution capacity, cause serious influence on human life, and are necessary to be eliminated and degraded, the photocatalytic oxidation reaction condition is mild, the operation is simple, and the technology is the pollution treatment technology with the most potential and application advantages.
In the existing photocatalyst, TiO is used2The oxide photocatalyst represented by the general formula is easy to generate carbon deposition inactivation in the degradation process, and the wide forbidden band width of the oxide photocatalyst can only be excited by ultraviolet light; the hydrotalcite is a two-dimensional anionic layered material, has adjustable composition and designability of structure, has obvious application advantages in the fields of catalysis and adsorption due to the special micro-nano structure, and is prepared from ZnSn (OH)6The typical double-metal layered hydroxide photocatalyst has an alkaline center and is not easy to deposit carbon, but the general activity is low, the preparation method has large influence on the catalytic activity, and the problem of unstable catalytic effect exists.
The embodiment of the invention relates to a catalytic type polluted soil remediation device, which comprises a semi-closed shell, a driving motor, a control device, a turnover screw rod and an excitation lamp tube, wherein the semi-closed shell is in a shape with one open end, the driving motor and the control device are arranged on one outer side wall of the semi-closed shell, a cavity with an opening is arranged on the inner side wall of the semi-closed shell, activated carbon and a photocatalyst are sequentially arranged in the cavity along the opening direction, the cavity is sealed by non-woven fabrics, a breathable film, a photocatalytic layer and a non-woven fabric layer are sequentially arranged at the top of the semi-closed shell from top to bottom, the turnover screw rod comprises a rotating shaft, a heating sleeve and a spiral turnover blade, the heating sleeve is fixedly arranged outside the rotating shaft, the spiral turnover blade is arranged outside the heating sleeve, the spiral turnover blade is covered with a photocatalyst coating, and two ends of the turnover screw rod are longitudinally connected with, the driving part is driven by a driving motor, the exciting lamp tube is arranged on the inner side wall of the semi-closed shell, and the driving motor, the heating sleeve and the exciting lamp tube are respectively and electrically connected with the control device;
preferably, the exciting lamp tube is a xenon lamp or an ultraviolet lamp;
preferably, the breathable film is made of PP or PVC;
preferably, the photocatalytic layer is an aluminum mesh structure, and the inside of the photocatalytic layer is filled with a photocatalyst;
further preferably, the photocatalyst is an indium tin double-metal layered hydroxide, which comprises an indium tin double-metal layered hydroxide, and platinum nanoparticles and an indium tin metal oxide loaded on the surface of the indium tin double-metal layered hydroxide;
the indium tin double-metal layered hydroxide has a polyhydroxy structure, provides an active center to capture water vapor and oxygen to generate oxygen anion free radicals, hydroxyl free radicals and the like, and carries and compounds the hydrotalcite substrate material with enhanced function, trace platinum load improves the catalytic effect and relieves the catalytic reaction conditions;
preferably, the indium tin bi-metal layered hydroxide is prepared by heating and reacting a salt solution of indium and tin in a hydrogen peroxide solution of carbamide;
further preferably, the salt solution of indium is indium nitrate; the salt solution of tin is sodium stannate, and the mass fraction of the hydrogen peroxide solution is 20-30%;
further preferably, the molar ratio of indium ions to stannate ions is 2: 3, the ratio of the amount of metal to the amount of the carboxamide compound is 1: 3-3.5;
further preferably, the heating reaction condition is that the reaction temperature is 140 ℃, and the reaction time is 12 h;
the conventional preparation method is difficult to prepare the hydroxide with a thin layer, needs to be assisted with stripping technology treatment, mainly mechanical stripping, or stripping by utilizing solvents such as toluene, alcohol or formamide and the like,the treatment conditions are harsh, and in the application, the catalytic action of the double-metal layered hydroxide on the decomposition of the hydrogen peroxide is utilized, and the hydrogen peroxide solution is used as a solvent to decompose the generated O2The gas promotes the interlayer separation of the double-metal layered hydroxide to prepare the thin-layer double-metal layered hydroxide, which is beneficial to improving the catalytic efficiency of the catalyst;
preferably, the platinum nanoparticles are obtained by crosslinking and calcining chloroplatinic acid and soluble starch on indium tin double-metal layered hydroxide;
further preferably, the loading amount of the platinum is 0.4-0.6%, and the mass ratio of the soluble starch to the platinum is 60-70: 1;
further preferably, the solution pH of the crosslinking system is controlled between 6 and 7;
the nano particles of the noble metal platinum have excellent catalytic activity, and the platinum nano particles are loaded on the indium-tin bimetal layered hydroxide, so that the effective separation of photon-generated carriers is facilitated, the recombination of electron holes is prevented, and the photocatalytic activity is improved; the preparation method has the advantages that a wet chemical synthesis method is generally adopted for controlled synthesis of the metal nanoparticles, aggregation is avoided by using a stabilizer, and the active sites are easily covered to cause reduction of catalytic activity, a cross-linked reticular structure is formed by using soluble starch and metal ions, so that combination and aggregation of nascent platinum ions are effectively prevented, and then calcination treatment is carried out to decompose the reticular structure, so that the platinum nanoparticles uniformly loaded on the indium-tin double-metal layered hydroxide are obtained, exposure of an active center and adsorption of reactant molecules are facilitated, the catalytic reaction efficiency is improved, platinum is introduced into a precursor, and the nanoparticles formed after calcination are uniformly dispersed in a catalyst, so that a physical barrier effect is achieved, and the dispersibility of the indium-tin metal oxide of the active center is further improved;
preferably, the metal oxide of indium tin, namely indium tin double-metal layered hydroxide is obtained by calcining treatment and recovery treatment;
further preferably, the calcination treatment is heat preservation for 4 hours at 350 ℃ in a nitrogen atmosphere, and the heating rate is 10 ℃/min;
titanium oxide and zinc oxide are the most widely used photocatalysts, can catalyze the oxidative decomposition reaction of a plurality of organic matters, but can only be excited by ultraviolet light, and the generated electron-hole pairs are easy to recombine; indium tin double-metal layered hydroxide is used as a catalyst precursor, indium tin metal oxide is formed on the surface through calcination treatment, a heterostructure is formed with the indium tin metal oxide and the double-metal layered hydroxide, defects are reduced, the specific surface is increased, a photo-generated carrier is provided as an optical activity center, the platinum metal promotes the separation of the carrier, and a spatially separated redox reaction zone is formed;
more preferably, the restoration treatment is performed by keeping the temperature of the restoration solution at 85 ℃ for 10h, vacuum drying at 70 ℃ and then irradiating the restoration solution for 1h by using a xenon lamp;
further preferably, the recovery liquid is a mixture of sodium hydroxide and sodium carbonate with a molar ratio of 3: 1 in water.
The present invention will be described in detail by way of examples. It is also to be understood that the following examples are illustrative of the present invention and are not to be construed as limiting the scope of the invention, and that certain insubstantial modifications and adaptations of the invention by those skilled in the art may be made in light of the above teachings. The specific process parameters and the like of the following examples are also only one example of suitable ranges, i.e., those skilled in the art can select the appropriate ranges through the description herein, and are not limited to the specific values exemplified below.
Example 1
In the embodiment, a catalytic contaminated soil remediation device comprises a semi-closed shell, a driving motor, a control device, a material turning screw and an excitation lamp tube, wherein the semi-closed shell is in a shape with one open end, the driving motor and the control device are arranged on an outer side wall of the semi-closed shell, a cavity with an opening is arranged on the inner side wall of the semi-closed shell, activated carbon and photocatalyst are sequentially arranged in the cavity along an opening direction, the cavity is sealed by non-woven fabrics, a breathable film, a photocatalytic layer and a non-woven fabric layer are sequentially arranged at the top of the semi-closed shell from top to bottom, the material turning screw comprises a rotating shaft, a heating sleeve and a spiral material turning blade, the heating sleeve is fixedly arranged outside the rotating shaft, the spiral material turning blade is arranged outside the heating sleeve, the spiral material turning blade is covered with a photocatalyst coating, and two ends of the material turning screw are longitudinally connected with a, the driving part is driven by a driving motor, the exciting lamp tube is arranged on the inner side wall of the semi-closed shell, and the driving motor, the heating sleeve and the exciting lamp tube are respectively and electrically connected with the control device; the exciting lamp tube is a xenon lamp; the photocatalytic layer is of an aluminum reticular structure, and the inside of the photocatalytic layer is filled with a photocatalyst; the photocatalyst is indium tin double-metal layered hydroxide and comprises indium tin double-metal layered hydroxide, and platinum nanoparticles and indium tin metal oxide loaded on the surface of the indium tin double-metal layered hydroxide; the preparation of the photocatalyst comprises the following steps:
A. preparation of catalyst precursor
(1) Adding In (NO) into 100ml of 20% hydrogen peroxide solution3)3·6H2O 3.27g，Na2SnO3·3H23.20g of O and 4.20g of carbamide, fully stirring for 10min, transferring into a reaction kettle, reacting for 12h at the constant temperature of 140 ℃, filtering out precipitate after self-cooling to room temperature, washing to be neutral by distilled water, drying in vacuum at 70 ℃ to constant weight, grinding by a mortar to obtain powder A;
(2) adding 1.5g of powder A into 100ml of distilled water, performing 200W ultrasonic treatment for 10min, and adding 0.023g H2PtCl6·6H2O, 0.62g of soluble starch and 0.1g of polysorbate-80, uniformly stirring, adjusting the pH value of the solution to 7 by ammonia water, continuously stirring for 10min, and drying at 90 ℃ to obtain a catalyst precursor;
B. calcination and recovery treatment
(1) Placing the catalyst precursor prepared in the step A into a molybdenum crucible, placing the molybdenum crucible into a graphite crucible, moving the graphite crucible into an atmosphere box type electric furnace, filling nitrogen as protective atmosphere, raising the temperature at a speed of 10 ℃/min to 350 ℃, keeping the temperature for 4h, and cooling to obtain a calcined product;
(2) weighing NaOH 1.61g and Na2CO31.42g, adding 700ml of distilled water, stirring for dissolving, adding 2g of calcined product, reacting at constant temperature of 85 ℃ for 10h, cooling and filtering out precipitate after the reaction is finished, washing to neutrality by distilled water, drying in vacuum at 70 ℃ to constant weight, and irradiating by a 300W xenon lamp for 1h to obtain the photocatalysis materialAnd (3) preparing.
Evaluation of catalytic Activity:
preparing 50ppm malachite green and 10ppm methylene blue, respectively adding 100ml of each, respectively adding 0.1g of catalyst for ultrasonic dispersion, stirring the mixed solution for 1h under the condition of no light to achieve adsorption balance, sampling and filtering with an ultrafiltration membrane, measuring the concentration of the initial solution by an ultraviolet spectrophotometry, continuously stirring the solution at room temperature, simultaneously irradiating with a xenon lamp or an ultraviolet lamp, measuring the concentration of the solution again after 2h, and calculating the degradation rate according to the concentration difference.
Preparing 50ppm of bisphenol A and 50ppm of phenol, respectively adding 100ml of the bisphenol A and the phenol, respectively adding 0.1g of catalyst for ultrasonic dispersion, stirring the mixed solution for 1h under the condition of no light to achieve adsorption balance, sampling and filtering by an ultrafiltration membrane, measuring the concentration of the initial solution by a high performance liquid chromatograph, continuously stirring the solution under the condition of room temperature, simultaneously irradiating and treating by a xenon lamp or an ultraviolet lamp, measuring the concentration of the solution again after 2h, and calculating the degradation rate according to the concentration difference.
A fixed bed micro-reactor in a continuous flow mode is adopted, the reaction temperature is controlled at 30 ℃, 0.1g of catalyst and 1g of 60-mesh high-purity quartz sand are mixed and then are loaded into a reactor, xenon lamps or ultraviolet lamps are arranged around the reactor for irradiation, 250ppm of benzene vapor or 100ppm of formaldehyde is used as reaction gas, the flow rate is 30ml/min, an online gas chromatograph is used for detecting the concentration of residual benzene, and the degradation rate is calculated according to the concentration difference.
The catalytic activity was similarly evaluated by comparing powder A prepared in step A (1) with titanium dioxide P25, and the results are shown in Table 1.
TABLE 1 comparison of the catalytic Activity of different catalysts
Example 2
In the embodiment, a catalytic contaminated soil remediation device comprises a semi-closed shell, a driving motor, a control device, a material turning screw and an excitation lamp tube, wherein the semi-closed shell is in a shape with one open end, the driving motor and the control device are arranged on an outer side wall of the semi-closed shell, a cavity with an opening is arranged on the inner side wall of the semi-closed shell, activated carbon and photocatalyst are sequentially arranged in the cavity along an opening direction, the cavity is sealed by non-woven fabrics, a breathable film, a photocatalytic layer and a non-woven fabric layer are sequentially arranged at the top of the semi-closed shell from top to bottom, the material turning screw comprises a rotating shaft, a heating sleeve and a spiral material turning blade, the heating sleeve is fixedly arranged outside the rotating shaft, the spiral material turning blade is arranged outside the heating sleeve, the spiral material turning blade is covered with a photocatalyst coating, and two ends of the material turning screw are longitudinally connected with a, the driving part is driven by a driving motor, the exciting lamp tube is arranged on the inner side wall of the semi-closed shell, and the driving motor, the heating sleeve and the exciting lamp tube are respectively and electrically connected with the control device; the excitation lamp tube is an ultraviolet lamp; the photocatalytic layer is of an aluminum reticular structure, and the inside of the photocatalytic layer is filled with a photocatalyst; the photocatalyst is indium tin double-metal layered hydroxide and comprises indium tin double-metal layered hydroxide, and platinum nanoparticles and indium tin metal oxide loaded on the surface of the indium tin double-metal layered hydroxide; the preparation of the photocatalyst comprises the following steps:
A. preparation of catalyst precursor
(1) Adding In (NO) into 100ml of hydrogen peroxide solution with the mass fraction of 30%3)3·6H2O 3.27g，Na2SnO3·3H23.20g of O and 3.96g of carbamide, fully stirring for 10min, transferring into a reaction kettle, reacting for 12h at the constant temperature of 140 ℃, filtering out precipitate after self-cooling to room temperature, washing to be neutral by distilled water, drying in vacuum at 70 ℃ to constant weight, grinding by a mortar to obtain powder A;
(2) adding 1.5g of powder A into 100ml of distilled water, performing ultrasonic treatment at 200W for 10min, adding 0.018g H2PtCl6·6H2O, 0.62g of soluble starch and 0.1g of polysorbate-80, uniformly stirring, adjusting the pH value of the solution to 6 by ammonia water, continuously stirring for 10min, and drying at 90 ℃ to obtain a catalyst precursor;
B. calcination and recovery treatment
(1) Placing the catalyst precursor prepared in the step A into a molybdenum crucible, placing the molybdenum crucible into a graphite crucible, moving the graphite crucible into an atmosphere box type electric furnace, filling nitrogen as protective atmosphere, raising the temperature at a speed of 10 ℃/min to 350 ℃, keeping the temperature for 4h, and cooling to obtain a calcined product;
(2) weighing NaOH 1.61g and Na2CO31.42g, adding 700ml of distilled water, stirring and dissolving, adding 2g of calcined product, reacting at constant temperature of 85 ℃ for 10h, cooling and filtering out precipitate after the reaction is finished, washing to be neutral by distilled water, drying in vacuum at 70 ℃ to constant weight, and irradiating by a 300W xenon lamp for 1h to obtain the photocatalyst.
The photocatalyst prepared in this example was tested for catalytic activity under xenon lamp irradiation, and the test results are shown in table 2.
Example 3
In the embodiment, a catalytic contaminated soil remediation device comprises a semi-closed shell, a driving motor, a control device, a material turning screw and an excitation lamp tube, wherein the semi-closed shell is in a shape with one open end, the driving motor and the control device are arranged on an outer side wall of the semi-closed shell, a cavity with an opening is arranged on the inner side wall of the semi-closed shell, activated carbon and photocatalyst are sequentially arranged in the cavity along an opening direction, the cavity is sealed by non-woven fabrics, a breathable film, a photocatalytic layer and a non-woven fabric layer are sequentially arranged at the top of the semi-closed shell from top to bottom, the material turning screw comprises a rotating shaft, a heating sleeve and a spiral material turning blade, the heating sleeve is fixedly arranged outside the rotating shaft, the spiral material turning blade is arranged outside the heating sleeve, the spiral material turning blade is covered with a photocatalyst coating, and two ends of the material turning screw are longitudinally connected with a, the driving part is driven by a driving motor, the exciting lamp tube is arranged on the inner side wall of the semi-closed shell, and the driving motor, the heating sleeve and the exciting lamp tube are respectively and electrically connected with the control device; the exciting lamp tube is a xenon lamp; the photocatalytic layer is of an aluminum reticular structure, and the inside of the photocatalytic layer is filled with a photocatalyst; the photocatalyst is indium tin double-metal layered hydroxide and comprises indium tin double-metal layered hydroxide, and platinum nanoparticles and indium tin metal oxide loaded on the surface of the indium tin double-metal layered hydroxide; the preparation of the photocatalyst comprises the following steps:
A. preparation of catalyst precursor
(1) 20 percent of peroxide in 100ml of mass fractionAdding In (NO) into hydrogen hydride solution3)3·6H2O 3.27g，Na2SnO3·3H23.20g of O and 3.60g of carbamide, fully stirring for 10min, transferring into a reaction kettle, reacting for 12h at the constant temperature of 140 ℃, filtering out precipitate after self-cooling to room temperature, washing to be neutral by distilled water, drying in vacuum at 70 ℃ to constant weight, grinding by a mortar to obtain powder A;
(2) adding 1.5g of powder A into 100ml of distilled water, performing 200W ultrasonic treatment for 10min, and adding 0.016g H2PtCl6·6H2O, 0.37g of soluble starch and 0.1g of polysorbate-80, uniformly stirring, adjusting the pH value of the solution to 7 by ammonia water, continuously stirring for 10min, and drying at 90 ℃ to obtain a catalyst precursor;
B. calcination and recovery treatment
(1) Placing the catalyst precursor prepared in the step A into a molybdenum crucible, placing the molybdenum crucible into a graphite crucible, moving the graphite crucible into an atmosphere box type electric furnace, filling nitrogen as protective atmosphere, raising the temperature at a speed of 10 ℃/min to 350 ℃, keeping the temperature for 4h, and cooling to obtain a calcined product;
(2) weighing NaOH 1.61g and Na2CO31.42g, adding 700ml of distilled water, stirring and dissolving, adding 2g of calcined product, reacting at constant temperature of 85 ℃ for 10h, cooling and filtering out precipitate after the reaction is finished, washing to be neutral by distilled water, drying in vacuum at 70 ℃ to constant weight, and irradiating by a 300W xenon lamp for 1h to obtain the photocatalyst.
The photocatalyst prepared in this example was tested for catalytic activity under xenon lamp irradiation, and the test results are shown in table 2.
Table 2 example catalytic activity under a photocatalyst xenon lamp
| Rate of degradation | Example 1 | Example 2 | Example 3 |
| Malachite green | 91.3％ | 91.4％ | 92.0％ |
| Methylene blue | 95.4％ | 94.2％ | 95.1％ |
| Bisphenol A | 92.1％ | 90.7％ | 91.2％ |
| Benzene and its derivatives | 90.8％ | 91.2％ | 89.4％ |
| Formaldehyde (I) | 94.9％ | 95.4％ | 93.5％ |
| Phenol and its preparation | 89.5％ | 90.2％ | 89.2％ |
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the subject matter of the invention is to be construed in all aspects and as broadly as possible, and all changes, equivalents and modifications that fall within the true spirit and scope of the invention are therefore intended to be embraced therein.
Claims (5)
1. The utility model provides a catalysis type pollutes soil prosthetic devices, its characterized in that, includes semi-closed shell, driving motor, controlling means, stirring screw rod, arouses the fluorescent tube, semi-closed shell is the open shape of one end, driving motor and controlling means set up on a lateral wall of semi-closed shell, be provided with the cavity of taking the open-ended on semi-closed shell's the inside wall, activated carbon and photocatalyst have set gradually along the opening direction in the cavity, the cavity is sealed by the non-woven fabrics, and semi-closed shell top sets gradually ventilated membrane, photocatalysis layer, non-woven fabrics layer from top to bottom, stirring screw rod includes axis of rotation, heating sleeve pipe, spiral stirring blade, and the heating sleeve pipe sets firmly outside the axis of rotation, and spiral stirring blade sets up in the heating sleeve pipe outside, is covered with the photocatalyst coating on the spiral stirring blade, stirring screw rod's both ends and the drive disk assembly longitudinal connection who sets up on the, the driving part is driven by a driving motor, the exciting lamp tube is arranged on the inner side wall of the semi-closed shell, and the driving motor, the heating sleeve and the exciting lamp tube are respectively and electrically connected with the control device;
the photocatalytic layer is of an aluminum reticular structure, and the inside of the photocatalytic layer is filled with a photocatalyst; the photocatalyst is indium tin double-metal layered hydroxide and comprises indium tin double-metal layered hydroxide, and platinum nanoparticles and indium tin metal oxide loaded on the surface of the indium tin double-metal layered hydroxide;
the platinum nanoparticles are obtained by crosslinking and calcining chloroplatinic acid and soluble starch on indium tin double-metal layered hydroxide.
2. The catalytic contaminated soil remediation device of claim 1, wherein said excitation light tube is a xenon lamp or an ultraviolet lamp.
3. The catalytic contaminated soil remediation device of claim 1, wherein the permeable membrane is made of PP or PVC.
4. The catalytic contaminated soil remediation device of claim 1, wherein said indium tin layered double hydroxide is prepared by the thermal reaction of a solution of salts of indium and tin in a solution of carbamide in hydrogen peroxide.
5. The catalytic contaminated soil remediation device of claim 1, wherein said indium tin metal oxide is formed from a bi-metal layered hydroxide of indium tin by calcination and rejuvenation.
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