Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for degrading microcystic toxin-LR in water body through photocatalytic oxidation

A microcystin, photocatalytic oxidation technology, applied in chemical instruments and methods, catalyst activation/preparation, oxidized water/sewage treatment, etc., can solve the problems of slow natural degradation, etc., with obvious effect and little influence of catalyst deactivation , the effect of good application prospects

Inactive Publication Date: 2009-11-04
DONGHUA UNIV
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to remove it by coagulation, sedimentation and sand filtration in conventional water treatment processes, and the natural degradation is slow, so some new treatment methods must be adopted

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for degrading microcystic toxin-LR in water body through photocatalytic oxidation
  • Method for degrading microcystic toxin-LR in water body through photocatalytic oxidation
  • Method for degrading microcystic toxin-LR in water body through photocatalytic oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of the supported catalyst: Dissolve 10 mL of tetrabutyl titanate in 20 mL of ethanol at room temperature, and stir vigorously for 10 min; drop 20 mL of acetic acid with a pipette at a rate of 1 drop / s, and stir vigorously for 10 min; Use an acid burette to slowly drop 20mL of ethanol and 1.7ml of distilled water mixture at a rate of about 0.33 drops / s, continue to stir for 2-3 hours, and age for 24 hours for later use. Immerse 4g of activated carbon (20-40 mesh) in 6mL of the aged liquid for 2h, place it in a resistance furnace and heat it up to 500°C at a rate of 3K / min and roast for 2h, take it out and cool it, wash it with distilled water and dry it, and complete a load ; Or repeated dipping-roasting-cleaning to complete different times of loading. Simultaneously for the preparation of supported catalysts and commercial P 25 The catalyst is characterized by X-ray diffraction pattern (XRD), see respectively figure 1 and figure 2 , the two spectra a...

Embodiment 2

[0026] Taihu Lake is a typical area of ​​eutrophication and blue-green algae outbreak, and the MCLR content is 1.8~4.6μg / L during the blue-green algae outbreak period, which exceeds the water quality standard (1μg / L) of my country's domestic drinking water. to degrade MCLR.

[0027] Take the Taihu Lake cyanobacteria outbreak water sample, add the photocatalyst (prepared in Example 1) containing 1g / L once loaded, and turn on the ultraviolet lamp after 30 minutes of adsorption, and detect that the MCLR is lower than my country's drinking water quality standard 10 minutes after turning on the ultraviolet lamp. At the same time, the secondary use of this catalyst has obvious catalytic degradation effect, and the influence of catalyst deactivation is small.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for degrading microcystic toxin-LR in a water body through photocatalytic oxidation, which comprises the following steps: mixing tetrabutyl titanate and ethanol, stirring the mixture for 10 minutes at normal temperature, dripping an acetic acid into the mixture, stirring the mixture for 10 minutes, slowly dripping a mixed liquid of the ethanol and distilled water, continuous stirring the mixture for 2 to 3 hours, and performing aging on the mixture for 24 hours for standby; impregnating active carbon in the aged liquid for 2 hours, roasting the obtained product for 2 hours at the temperature of 500 DEG C, and washing and drying the obtained product; and mixing a water sample containing the microcystic toxin-LR with a TiO2 supported catalyst according to the proportion of 1L:1g, performing adsorption on the mixture for 30 minutes, and opening an ultraviolet lamp to irradiate the obtained product for 10 minutes. The method has the advantages of quickness, high efficiency, safety, simple treatment process, low cost, environmental protection, secondary utilization of the catalyst, obvious catalytic degradation effect, small inactivation influence of the catalyst, and good application prospect in the field of water treatment and purification.

Description

technical field [0001] The invention belongs to the field of degradation and purification of microcystin-LR in water, in particular to a method for degrading microcystin-LR in water by photocatalytic oxidation. Background technique [0002] With the rapid development of industry and agriculture, a large amount of wastewater containing nitrogen and phosphorus and domestic sewage are discharged into rivers, lakes and seas, resulting in serious eutrophication of natural water bodies and the outbreak of cyanobacteria blooms. The outbreak of cyanobacterial blooms will not only cause water quality to deteriorate, but also produce and release a variety of algal toxins from cyanobacteria, among which the LR type is the most toxic, most common, and relatively large in content (L and R represent leucine and arginine respectively. ). The World Health Organization (WHO) recommends that the concentration of microcystin LR in drinking water should not be higher than 1 μg / L. my country l...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/72C02F1/28B01J21/18B01J21/06B01J37/02
Inventor 闵浩刘振鸿薛罡杨煜东邱恒翟毅杰吴雪峰
Owner DONGHUA UNIV