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Method for removing orange yellow I in printing and dyeing wastewater by using sulfurized modified zero-valent iron material under effect of low-intensity magnetic field

A technology for printing and dyeing wastewater and zero-valent iron, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as high cost, harsh preparation conditions for nano-zero-valent iron, and unsatisfactory practical applications, and achieve Increased efficiency, ease of application, and accelerated electron transfer

Inactive Publication Date: 2016-08-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nano-zero-valent iron used in it has the disadvantages of harsh preparation conditions, high cost, and unsatisfactory practical applications.

Method used

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  • Method for removing orange yellow I in printing and dyeing wastewater by using sulfurized modified zero-valent iron material under effect of low-intensity magnetic field
  • Method for removing orange yellow I in printing and dyeing wastewater by using sulfurized modified zero-valent iron material under effect of low-intensity magnetic field
  • Method for removing orange yellow I in printing and dyeing wastewater by using sulfurized modified zero-valent iron material under effect of low-intensity magnetic field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: Preparation of vulcanized modified zero-valent iron material

[0046] Nitrogen was passed through 250mL of acetic acid-sodium acetate buffer solution with a pH of 6.0 until the dissolved oxygen was zero, and then 1g of zero-valent iron was quickly added to seal it and placed in a shaker with a speed of 120r / min to rotate and shake for 10min. Middle Fe 2+ When it is 50mg / L, add 1M Na 2 S solution 1.5mL, then placed in a shaker and rotated at 25°C for 12h. Finally, filter and vacuum freeze-dry for 2h. The sulfur-iron molar ratio of the obtained vulcanized modified zero-valent iron material is 0.084. About 0.95 g of product was obtained. This was repeated 8 times to give about 7.6 g of product.

[0047] The X-ray photoelectron spectrum (XPS) of gained vulcanization modified zero-valent iron is as follows figure 1 As shown in the scanning electron microscope (SEM) image of image 3 shown. Depend on figure 1 , image 3 It can be seen that the vulcanized ...

Embodiment 2

[0050] Utilize the vulcanized modified zero-valent iron material prepared in Example 1 to remove the orange I in the printing and dyeing wastewater under the effect of an externally applied weak magnetic field, the orange I content in the wastewater is 100mg / L wastewater, the steps are as follows:

[0051] (1) Take 1L of printing and dyeing wastewater containing Orange I, put it in a reactor, add 2.383g buffer HEPES (concentration 10mmol / L) and adjust the pH=7 with a 20% NaOH solution;

[0052] (2) Add 2g / L of the vulcanized modified zero-valent iron material prepared in Example 1, place a ring magnet at the bottom of the reactor, provide a non-uniform weak magnetic field with a magnetic field strength≤20mT, and use 400r / min under the action of the weak magnetic field The reaction was stirred at a rotating speed for 15 minutes, and the removal rate of Orange I was over 98.2%. Continue to stir the reaction at 400r / min for 20min, and the removal rate of Orange I is approximately...

Embodiment 3

[0053] Example 3: The experiment of removing orange I in printing and dyeing wastewater by sulfurized modified zero-valent iron material under the action of weak magnetic field.

[0054] (1) Dissolve the analytically pure orange I reagent in distilled water, configure the simulated printing and dyeing wastewater containing orange I of different concentration gradients, and utilize a UV-visible spectrophotometer to measure the absorbance of the simulated orange I wastewater with different concentration gradients at a wavelength of 476nm, Make concentration-absorbance standard curve;

[0055] Use the buffer agent HEPES and sodium hydroxide to adjust, so that the configured simulated printing and dyeing wastewater with different concentration gradients has a pH of 7;

[0056] The above-mentioned simulated orange yellow I wastewater of different concentrations is that the orange yellow I content is 50, 100 and 200mg / L respectively;

[0057] (2) Place a ring magnet at the bottom o...

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Abstract

The invention relates to a method for removing orange I in printing and dyeing wastewater by using a vulcanized modified zero-valent iron material under the action of a weak magnetic field. The vulcanized modified zero-valent iron material is a dispersed particle coated with a layer of iron sulfide on the surface of zero-valent iron. The printing and dyeing wastewater of I has a pH of 6.5-7; the sulfide-modified zero-valent iron material is added, and the reaction is stirred for 10-60 minutes under the action of a weak magnetic field. The invention improves the reactivity of the zero-valent iron and accelerates the removal rate of orange I through the method of vulcanization modification and external weak magnetic field. The removal efficiency of the method for orange I is much higher than that of zero-valent iron, and the sulfide-modified zero-valent iron material is simple to prepare, low in cost, and environmentally friendly; it has broad application prospects in organic wastewater treatment.

Description

technical field [0001] The invention relates to a method for removing orange I in printing and dyeing wastewater by using vulcanized modified zero-valent iron, namely iron sulfide / zero-valent iron, under the action of a weak magnetic field, and belongs to the technical field of treating organic pollutants in wastewater. Background technique [0002] With the continuous development of the printing and dyeing industry, the discharge of dye organic wastewater is increasing, and it has high chroma, high organic content, complex components, large pH fluctuations and high toxicity (carcinogenic, teratogenic, mutagenic effects) ) and other characteristics, the discharge into the environment poses a great threat to the health of humans and other organisms. Among them, the azo dye Orange I is mainly used in the dyeing process, and its properties are stable and difficult to degrade. Once it enters the human body, it will cause cancer risk. Therefore, the development of high-efficienc...

Claims

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Application Information

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IPC IPC(8): C02F9/12C02F101/38
CPCC02F9/00C02F1/482C02F1/66C02F1/705C02F2101/308C02F2101/38C02F2101/40
Inventor 许春华张炳亮王亚浩邵欠欠
Owner SHANDONG UNIV
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