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Process for treating waste water of methylene blue dye and process for preparing catalyst

A methylene blue dye and wastewater treatment technology, applied in the field of water treatment, can solve the problems of difficult mass production, harsh experimental conditions, and poor repeatability, and achieve the effects of rapid response, simple preparation, and stable performance

Inactive Publication Date: 2006-06-28
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] About the preparation of the nanostructure oxide of manganese, according to " Chemistry-A European Journal " (2003, the 9th volume, the 1645-1651 page) report, with [{Mn(SO 4 )(4,4 / -bpy)(H 2 O) 2 }n] polymer and NaOH solution as raw materials, γ-MnO can be synthesized by hydrothermal chemical reaction 2 nanowires, but this method is costly, reproducible, and unreliable
The United States "Journal of Solid State Chemistry" (Journal of Solid State Chemistry) (2004, volume 177, pages 2628-2631) reported the use of electrospinning technology to prepare Mn 2 o 3 and Mn 3 o 4 Nanofibers, but this method requires many steps such as sol-gel process, electrospinning process and calcination, and the operation is complicated, the experimental conditions are harsh, and it is not easy to produce in large quantities

Method used

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  • Process for treating waste water of methylene blue dye and process for preparing catalyst
  • Process for treating waste water of methylene blue dye and process for preparing catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: Preparation of γ-MnOOH nanorods

[0043] After mixing 4g of potassium permanganate, 400mL of distilled water and 4mL of absolute ethanol evenly, react at 150°C and 0.5-1.0Mpa for 24 hours. Then the product was taken out, washed 3-5 times with distilled water, and then washed once with absolute ethanol. Vacuum-dried at 70° C. for 4 hours to obtain a brown-yellow powder.

[0044] Analysis by X-ray powder diffraction (XRD) and transmission electron microscope (TEM) shows that the obtained product is a monoclinic γ-MnOOH nanorod with a diameter of 30-500 nm and a length of several micrometers to tens of micrometers.

Embodiment 2

[0045] Example 2: β-MnO 2 Preparation of nanorods

[0046] The γ-MnOOH nanorods were calcined at 250 °C in air for 8 hours to obtain a black product.

[0047] X-ray powder diffraction (XRD) and transmission electron microscope (TEM) analysis showed that the obtained product was tetragonal β-MnO 2 The nanorods have a diameter between 40-300nm and a length of several micrometers to more than ten micrometers.

Embodiment 3

[0048] Example 3: Mn 2 o 3 Preparation of nanorods

[0049] The γ-MnOOH nanorods were calcined at 700 °C in air for 8 hours to obtain a black product.

[0050] Analysis by X-ray powder diffraction (XRD) and transmission electron microscope (TEM) showed that the obtained product was orthorhombic Mn 2 o 3 Nanorods have a diameter between 50-300nm and a length of several microns.

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Abstract

A process for treating the methylene blue dye sewage features that the nano-class oxide of Mn is used as catalyst to catalyze the oxidizing of H2O2 to decompose the methylene blue dye.

Description

Technical field: [0001] The invention relates to a water treatment method, more specifically a method for treating dye wastewater containing methylene blue, and a method for preparing a catalyst involved therein. Background technique: [0002] With the development of dyestuff and printing and dyeing industry, its production wastewater has become one of the most important sources of water pollution. Due to the complex composition of this type of wastewater, it often contains a variety of organic dyes and their intermediates. It has deep color, strong toxicity, refractory degradation, large pH fluctuations, high concentration, and large water volume. It has always been a difficulty in industrial wastewater treatment. They have posed a growing threat to the environment. According to reports, about 1-20% of the world's total dye production is lost in the printing and dyeing process and discharged as wastewater, which is the main source of water color pollution and eutrophicatio...

Claims

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Application Information

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IPC IPC(8): C02F1/72B01J23/34C01G45/02C02F103/30C02F103/34
Inventor 张卫新杨则恒张愿成王雪
Owner HEFEI UNIV OF TECH
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