Method for photocatalytic degradation of nitrate nitrogen in water body by utilizing glucose

A glucose and photocatalytic technology, applied in the field of water treatment, can solve the problems of low treatment efficiency and long operation cycle, and achieve the effect of high removal efficiency and mild reaction conditions

Active Publication Date: 2020-08-21
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional biological treatment method has low treatment efficiency and long operation period, so it is not suitable for scenarios that require rapid treatment such as initial rainwater

Method used

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  • Method for photocatalytic degradation of nitrate nitrogen in water body by utilizing glucose
  • Method for photocatalytic degradation of nitrate nitrogen in water body by utilizing glucose
  • Method for photocatalytic degradation of nitrate nitrogen in water body by utilizing glucose

Examples

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Effect test

Embodiment 1

[0018] The present invention is a method for using glucose to photocatalyze the degradation of nitrate nitrogen in water, specifically comprising the following steps:

[0019] Step 1, weigh 2.5g of P25 and silver nitrate with a corresponding Ag mass fraction of 1%, add 250mL of deionized water; use nitrogen to aerate to drive out the dissolved oxygen in the solution until the dissolved oxygen is not more than 0.1mg / L ; Add 10ml of ethanol as a reducing agent, then adjust the pH value to 11 with dilute NaOH solution, and irradiate for 10 hours under a 125W high-pressure mercury lamp; after the irradiation is completed, centrifuge and wash 5 times with deionized water; The catalyst was dried in a constant temperature blast oven for 24 hours, then ground into powder, and finally calcined at 200°C for 6 hours, and then ground again to make a photocatalyst-silver-loaded titanium dioxide;

[0020] Step 2, inject 250mL nitrate waste water into photochemical reactor, in waste water, t...

Embodiment 2

[0026] The present invention is a method for using glucose to photocatalyze the degradation of nitrate nitrogen in water, specifically comprising the following steps:

[0027] Step 1 is the same as embodiment 1;

[0028] Step 2, inject 250mL of nitrate wastewater into the photochemical reactor, wherein the initial concentration of nitrate nitrogen is 15mg / L, the initial concentration of COD is 100mg / L, and the nitrate wastewater uses potassium nitrate to simulate nitrate nitrogen, and glucose is used as organic matter; In two parallel experiments, different amounts of catalysts were added, and the amounts of catalysts in the photocatalytic reaction system were 0.25mg / L, 0.50mg / L, 1.00mg / L, and 1.50mg / L respectively; the initial pH of the photocatalytic reaction system=4.5 ;

[0029] Step 3, using a high-pressure mercury lamp with a power of 125W as the ultraviolet light source, placing the reaction solutions with different dosages of photocatalysts in the photochemical reacto...

Embodiment 3

[0033] The present invention is a method for using glucose to photocatalyze the degradation of nitrate nitrogen in water, specifically comprising the following steps:

[0034] Step 1 is the same as embodiment 1;

[0035] Step 2, in multiple parallel experiments, the dosage of COD in 250mL nitrate wastewater was 0mg / L, 25mg / L, 50mg / L, 75mg / L, 100mg / L, 150mg / L, potassium nitrate was used for nitrate wastewater Simulate nitrate nitrogen, glucose as organic matter; the initial concentration of nitrate nitrogen is 15mg / L, the dosage of photocatalyst is 0.25mg, and the initial pH of the photocatalytic reaction system is adjusted to 4.5;

[0036] Step 3, using a high-pressure mercury lamp with a power of 125W as the ultraviolet light source, placing the reaction solutions with different dosages of COD in the photochemical reactor, turning on the light source and condensate water switch, so that the reaction solution is oxidized under ultraviolet light irradiation The reduction react...

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Abstract

The invention discloses a method for photocatalytic degradation of nitrate nitrogen in a water body by utilizing glucose. Nitrate wastewater containing glucose is photocatalytically degraded under ultraviolet light by taking silver-loaded titanium dioxide as a photocatalyst. According to the method, nitrate in the wastewater is removed by utilizing glucose, the removal efficiency of nitrate in thewastewater is high, the removal rate can reach 95% or higher, the gas conversion rate reaches 70% or above, effective removal of the glucose in the wastewater also can be achieved, and the glucose removal rate is about 70%. Compared with the prior art, the method has the following advantages: the reaction conditions are mild, the photocatalyst can be repeatedly utilized, and the method can be applied to degradation of nitrate nitrogen in surface water and industrial wastewater which need to be rapidly treated.

Description

technical field [0001] The invention relates to a method for using glucose to photocatalyze the degradation of nitrate nitrogen in water, belonging to the technical field of water treatment. Background technique [0002] Nitrate nitrogen and organic matter are common pollutants in water bodies, which not only cause harm to the water environment, but also have a certain impact on the human body. The traditional biological treatment method has low treatment efficiency and long operation period, and is not suitable for scenes that require rapid treatment such as initial rainwater. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for utilizing glucose to photocatalytically degrade nitrate nitrogen in water, which can simultaneously degrade glucose and nitrate nitrogen in water by using photocatalyst. [0004] Technical scheme of the present invention is: [0005] A method for photocatalytically degrading ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/70C02F101/16C02F101/30
CPCC02F1/32C02F1/70C02F2305/10C02F2101/163C02F2103/007C02F2209/06C02F2209/08C02F2305/02C02F2209/14C02F2209/15C02F2101/30Y02W10/37
Inventor 吴磊林超郑天怡
Owner SOUTHEAST UNIV
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