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Photocatalysis-Fenton in-situ coupling method for killing bacteria in ballast water

A technology of ballast water and photocatalysis, which is applied in chemical instruments and methods, sterilization/microdynamic water/sewage treatment, water/sewage treatment, etc., can solve the problems of low sterilization efficiency and low efficiency of hydrogen peroxide, and achieve improvement Effect of photocatalytic sterilization efficiency, reduction of sterilization cost, and excellent activity

Pending Publication Date: 2020-11-20
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is how to overcome the low efficiency of in-situ hydrogen peroxide generation and low sterilization efficiency, and provide a photocatalytic-Fenton in-situ coupling method for killing bacteria in ballast water, which can realize ballast Efficient killing of bacteria in water

Method used

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  • Photocatalysis-Fenton in-situ coupling method for killing bacteria in ballast water
  • Photocatalysis-Fenton in-situ coupling method for killing bacteria in ballast water

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1. Put 5g of melamine precursor in a crucible, heat up to 425°C at a speed of 3°C / min for 9h to prepare melem (Melem), after the temperature cools down, grind it into a light yellow powder in an agate mortar, and then Mix Melem with pyromellitic dianhydride (PMDA), heat at 7°C / min to 325°C for 4 hours to obtain g-C 3 N 4 / PDI photocatalyst.

[0030] 2. Mix 50mg g-C 3 N 4 G-C 3 N 4 / PDI / Fe 2+ Photocatalysis-Fenton in situ coupling system, so that the concentration of ferrous ions is 1.8mmol / L, g-C 3 N 4 The concentration of the / PDI photocatalyst is 1g / L, and the pH is adjusted to be 8. Under air conditions, place in a dark place and stir for 30min; Samples were taken at regular intervals, and the number of colonies was calculated using the plate count method.

[0031] Among them, the bacteria in the ballast water are Vibrio alginolyticus selected as the target inactivated bacteria. The Vibrio alginolyticus was cultured at 37°C for 16 hours to obtain the strains...

Embodiment 2

[0038] 1. Put 5g of melamine precursor in a crucible, heat up to 350°C at a speed of 3°C / min for 6h to prepare Melem, and after the temperature cools down, grind the sample into a light yellow powder in an agate mortar, then mix Melem with Mix PMDA, heat up to 300°C at a speed of 7°C / min for 3 hours to obtain g-C 3 N 4 / PDI photocatalyst.

[0039] 2. Mix 50mg g-C 3 N 4 G-C 3 N 4 / PDI / Fe 2+Photocatalysis-Fenton in-situ coupling system; make the ferrous ion concentration 0.9mmol / L. The pH is 8, under air condition, placed in a dark place and stirred for 30 minutes; then turn on the xenon light source (equipped with a visible light filter (λ>400nm) to irradiate to kill the bacteria in the ballast water, and calculate the number of colonies by plate counting method.

[0040] Among them, the ballast water bacteria select Vibrio alginolyticus as the target inactivated bacteria. Vibrio alginolyticus was cultured at 37°C for 16 hours to obtain strains in the stable phase, whic...

Embodiment 3

[0042] 1. Put 5g of melamine precursor in a crucible, heat at a constant temperature of 450°C for 10 hours at a heating rate of 5°C / min to prepare Melem, and after the temperature cools down, grind the sample into a light yellow powder in an agate mortar, then mix Melem with Mix PMDA, heat up to 350°C at a speed of 10°C / min for 6 hours to obtain g-C 3 N 4 / PDI photocatalyst.

[0043] 2. Add 50mg g-C3N4 / PDI and 0.0375mg ferrous sulfate heptahydrate to 50mL ballast water containing bacteria to prepare g-C 3 N 4 / PDI / Fe 2+ The photocatalytic-Fenton in situ coupling system made the ferrous ion concentration 2.7mmol / L. The pH is 8, under air conditions, placed in the dark and stirred for 30min, then turned on the xenon light source (equipped with a visible light filter (λ > 400nm) to irradiate to kill the bacteria in the ballast water, and the number of colonies was calculated by plate counting method.

[0044] Among them, the ballast water bacteria select Vibrio alginolyticus...

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Abstract

The invention belongs to the technical field of sterilization, and discloses a photocatalysis-Fenton in-situ coupling method for killing bacteria in ballast water and an application. The method comprises the following steps: heating melamine to 350-450 DEG C, heating at a constant temperature to prepare melem, then mixing melem with pyromellitic dianhydride, heating to 300-350 DEG C, and heating at a constant temperature, then adding the prepared g-C3N4 / PDI photocatalyst and a ferrous ion compound into ballast water containing bacteria to obtain a g-C3N4 / PDI / Fe<2+> photocatalysis-Fenton in-situ coupling system, adjusting the pH value to 2-10, introducing a reaction atmosphere, stirring in a dark place, and killing bacteria in ballast water under the irradiation of a visible light source. The method is high in efficiency of killing harmful microorganisms in ballast water, also has the capability of producing hydrogen peroxide through photocatalysis, does not add a chemical oxidant required by a conventional Fenton technology, is low in treatment cost, and has the characteristic of green and sustainable development.

Description

technical field [0001] The invention belongs to the technical field of sterilization, and more specifically relates to a photocatalysis-Fenton in-situ coupling method for killing bacteria in ballast water. Background technique [0002] Ships carry ballast water to ensure the stability and operational safety of ships during shipping. Every year, 10 billion to 30 billion tons of ballast water and the various organisms it carries operate around the world. These surviving species enter new The environment caused biological invasion, which may cause serious ecological damage and economic loss. Therefore, the implementation of current International Maritime Organization (IMO, 2004) and United States regulations (USCG, 2012) will require effective treatment of ballast water in accordance with discharge limit standards. Ballast water treatment usually filters out larger organisms first, and then disinfects smaller microorganisms such as phytoplankton and bacteria. The commonly used...

Claims

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Application Information

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IPC IPC(8): C02F1/30C02F1/72C02F1/50C02F103/00
CPCC02F1/30C02F1/722C02F1/725C02F1/50C02F2103/008C02F2303/04C02F2305/10
Inventor 王万军谢皓晶安太成李桂英
Owner GUANGDONG UNIV OF TECH