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Preparation method for photocatalytic hydrogel for removing algae from water body

A hydrogel and photocatalytic technology, applied in the field of water treatment, can solve problems such as poor catalyst treatment effect, low photocatalytic efficiency, secondary environmental pollution, etc., achieve bacteriostatic effect and strong adsorption, improve utilization rate, good biocompatibility

Inactive Publication Date: 2019-08-27
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some defects in the application of nano-photocatalysts in actual water bodies: (1) The existing photocatalyst systems are basically suspension systems, which are suitable for homogeneous pollutants in water bodies, and will cause algal blooms The algae mainly grow on the surface of the water body, and once the water bloom breaks out, the visible light below the water surface will be blocked by the water bloom, the photocatalytic efficiency is low, and the suspension system catalyst is not effective in treating it; (2) The existing photocatalysts are basically powder shape, it is difficult to recycle in practical application, and it will cause secondary pollution to the environment

Method used

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  • Preparation method for photocatalytic hydrogel for removing algae from water body
  • Preparation method for photocatalytic hydrogel for removing algae from water body

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Embodiment

[0023] (1) g-C 3 N 4 Synthesis

[0024] Put 0.3 g of melamine in a 30 mL crucible, seal it with tin foil, cover it, and calcinate it in a muffle furnace at a temperature of 500°C to 520°C for 2 h with a heating rate of 4°C / min. After grinding, it is obtained Bright yellow g-C 3 N 4 powder;

[0025] (2) Ag 2 O / g-C 3 N 4 Synthesis

[0026] 0.3 g g-C 3 N 4 Ultrasonic dispersion in 20 mL deionized water for 10 min, followed by adding 0.07 g of AgNO 3 , after magnetically stirring at a speed of 200 rpm for 30 min, slowly add 20 mL of 0.35 mol / L NaOH dropwise under stirring conditions until the pH of the mixture is 14, and obtain a black product after stirring for 0.5 h, and then centrifuge after stirring for 30 min. The Ag 2 O / g-C 3 N 4 ;

[0027] (3) Floating Ag 2 O / g-C 3 N 4 / Preparation of hydrogel

[0028] Add 3 g of polyvinyl alcohol and 0.3 g of chitosan to 50 g of deionized water, add 50 μL of glacial acetic acid, and stir in a 90°C water bath for 1 h to ...

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Abstract

The invention discloses a preparation method for photocatalytic hydrogel for removing algae from a water body. Porous hydrogel which can float on water is prepared by combining a photocatalytic material and polyvinyl alcohol / chitosan hydrogel by utilizing the characteristics that the polyvinyl alcohol and boracic acid are solidified instantaneously under an alkali condition, and is used for removing algal cells from the water body in visible light. The floating type visible light photocatalytic hydrogel prepared by the preparation method has the characteristics of high photocatalytic activity,biocompatibility, strong antibacterial effect and high adsorption property, can be directly thrown into an algae bloom water body to realize the adsorption and photocatalytic degradation of the algalcells in the water body, and is convenient to recovery after photocatalytic hydrogel is saturated by absorbing water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for preparing a floating photocatalytic hydrogel for removing algae in eutrophic water bodies. Background technique [0002] In recent years, due to the impact of human activities, environmental pollution has become increasingly serious, and the nitrogen-rich and phosphorus-rich levels of water bodies have increased sharply. In addition, the global temperature continues to rise, and the problem of cyanobacteria blooms has become more and more serious. Cyanobacteria are difficult to digest and lack natural enemies in nature, and because of suitable environmental factors, cyanobacteria blooms often break out. After the outbreak of algae bloom, the water body lacks oxygen, the water quality deteriorates, and the biodiversity in the water body decreases sharply. Moreover, after the death of cyanobacteria, it will release a secondary product-microcystin (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26C02F1/30C02F1/72
CPCB01J31/26C02F1/30C02F1/725C02F2303/04B01J35/23B01J35/39
Inventor 范功端周津津马宝民罗静洪亮
Owner FUZHOU UNIV