Method for reducing algal toxin in water based on catalytic hydrogenation of supported noble metal catalyst

A precious metal catalyst, catalytic hydrogenation technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, chemical instruments and methods, reduced water/sewage treatment, etc. The technical energy consumption is high, the oxidation process is not selective, etc., to achieve the effect of fast speed, obvious toxicity removal, and simple operation

Pending Publication Date: 2021-02-23
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, photocatalytic technology faces the problems of high energy consumption, strict operating conditions, and difficulty in controlling by-products.
Therefore, the photocatalytic process is currently difficult to become a good alternative technology in the water treatment process
In summary, the current strategies for removal of microcystins based on chemical oxidation methods all lead to the formation of toxic by-products, which increases risk and costs
This is a common technical hurdle due to the non-selective nature of the oxidation process

Method used

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  • Method for reducing algal toxin in water based on catalytic hydrogenation of supported noble metal catalyst
  • Method for reducing algal toxin in water based on catalytic hydrogenation of supported noble metal catalyst
  • Method for reducing algal toxin in water based on catalytic hydrogenation of supported noble metal catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Weigh 0.5g of titanium oxide, cerium oxide, and alumina carrier in a small beaker, calculate the volume of chloropalladium acid needed to load 1wt.%Pd according to the carrier mass, and use a pipette to add the volume according to the calculated volume Add chloropalladium acid solution to different supports to get 1%Pd / TiO 2 , 1%Pd / Al 2 o 3 , 1%Pd / CeO 2 Material.

[0039] (2) Magnetic stirring step (1) the solution in the beaker for 1h, and add 1M Na 2 CO 3 The solution was brought to pH=10.5, and stirring was continued for 1 h.

[0040] (3) The solution obtained in step (2) was washed with deionized water through a 0.45 micron filter membrane until neutral, dried in an oven at 105°C, and calcined in a muffle furnace at 300°C for 4 hours.

[0041] (4) The material after roasting in the step (3) is heated at 300° C. 2 (25mL min -1 ) in the atmosphere for 2h to obtain Pd materials with different supports.

[0042] (5) Weigh 5 mg of Pd material obtained in ste...

Embodiment 2

[0046] (1) Weigh 0.5g titanium oxide carrier in a small beaker, calculate the volume of chloropalladic acid, chloroplatinic acid, and rhodium chloride solution needed to load 0.1wt.% Pd, Pt, Rh according to the carrier mass, and obtain according to the calculation Add chloropalladic acid, chloroplatinic acid, rhodium chloride solution to titanium oxide with a pipette gun to get 0.1% Pd / TiO 2 , 0.1%Rh / TiO 2 , 0.1%Pt / TiO 2 Material.

[0047] (2) Magnetic stirring step (1) the solution in the beaker for 1h, and add 1M Na 2 CO 3 The solution was brought to pH=10.5, and stirring was continued for 1 h.

[0048] (3) The solution obtained in step (2) was washed with deionized water through a 0.45 micron filter membrane until neutral, dried in an oven at 105°C, and calcined in a muffle furnace at 300°C for 4 hours.

[0049] (4) The material after roasting in the step (3) is heated at 300° C. 2 (25mL min -1 ) in the atmosphere for 2h to obtain titanium oxide materials loaded with...

Embodiment 3

[0053] (1) Weigh 0.5g titanium oxide carrier in a small beaker, and calculate the volume of chloropalladium acid solution needed to load 0.1wt.% Pd, 0.2wt.% Pd and 0.3wt.% Pd according to the carrier mass, and obtain according to the calculation volume of chloropalladic acid solution was added to titania with a pipette to obtain different loadings of Pd / TiO 2 Material.

[0054] (2) Magnetic stirring step (1) the solution in the beaker for 1h, and add 1M Na 2 CO 3 The solution was brought to pH=10.5, and stirring was continued for 1 h.

[0055] (3) The solution obtained in step (2) was washed with deionized water through a 0.45 micron filter membrane until neutral, dried in an oven at 105°C, and calcined in a muffle furnace at 300°C for 4 hours.

[0056] (4) The material after roasting in the step (3) is heated at 300° C. 2 (25mL min -1 ) in the atmosphere for 2h to obtain catalysts Pd / TiO with different Pd loads 2 .

[0057] (5) Weigh the Pd / TiO of different Pd loadings...

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PUM

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Abstract

The invention discloses a method for catalytic hydrogenation reduction of algal toxin in water based on a supported noble metal catalyst, which comprises the following steps: adding the supported noble metal catalyst into a water body containing microcystic toxin, regulating the pH value of the water body to 6.0-9.0, and introducing hydrogen into the water body to perform catalytic hydrogenation reduction reaction. After the reaction is completed, degradation products in the water body do not have hepatotoxicity any more, and the non-toxic effect of the products is achieved. Compared with an existing method for degrading MCLR, the liquid-phase catalytic reduction method provided by the invention can selectively reduce Adda toxic groups of MC-LR, is obvious in toxicity removal, high in MC-LR degradation efficiency and high in speed, and has the advantages of technical feasibility, simplicity in operation, easiness in obtaining materials and no secondary pollution of degradation products.

Description

technical field [0001] The invention belongs to the field of liquid-phase catalysis and the environment, and in particular relates to a method for catalytically hydrogenating and reducing algae toxins in water based on a supported noble metal catalyst. Background technique [0002] The increasing incidence of algal blooms in surface drinking water resources (lakes, reservoirs, and rivers) is of global public concern, in which various genera of cyanobacteria (e.g., Microcystis, Anabaena, Nodosum , Oscillating Algae, etc.) released microcystins (MCs) are the most common cyanotoxins in eutrophic water bodies, of which the LR type is the most common microcystins, accounting for the total amount of microcystins in cyanobacteria blooms 46.0%-99.8%. MC-LR is a highly toxic acute liver toxin, the half-lethal dose (LD) of mice 50 ) at 50 μg / kg, can inhibit protein phosphatases (such as PP1 and PP2A), and induce liver cancer through long-term contact with drinking water. [0003] D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/44B01J23/46B01J23/42C02F1/70C02F101/38
CPCB01J23/42B01J23/46B01J23/464B01J23/63C02F1/70C02F2101/38
Inventor 瞿晓磊郑寿荣刘昆孙敬雅
Owner NANJING UNIV
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