CN113213611A

CN113213611A - Method for degrading dye wastewater by directly activating persulfate through hydroxylamine hydrochloride

Info

Publication number: CN113213611A
Application number: CN202110350520.5A
Authority: CN
Inventors: 刘亚纳; 罗丽; 周鸣; 朱书法; 苗娟
Original assignee: Henan University of Science and Technology
Current assignee: Henan University of Science and Technology
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-08-06

Abstract

A method for degrading dye wastewater by directly activating persulfate through hydroxylamine hydrochloride comprises the following specific steps: and adding persulfate and hydroxylamine hydrochloride into the dye wastewater, mixing, adjusting the pH value of the solution, and reacting for 80-100 min at normal temperature and normal pressure. The hydroxylamine hydrochloride is used for directly activating persulfate to form a redox system to generate a strong-oxidizing active substance SO₄ ^‑Degrading dye molecules in the wastewater, and having good decolorizing effect on the dye molecules; the method for degrading the dye wastewater by directly activating the persulfate through the hydroxylamine hydrochloride has the advantages of simple process and finished productThe method has the advantages of low cost, mild and safe reaction system, non-toxic and harmless sulfate radical ions as reaction products, no secondary pollution, good removal effect and wide application in the field of water treatment.

Description

Method for degrading dye wastewater by directly activating persulfate through hydroxylamine hydrochloride

Technical Field

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for degrading dye wastewater by directly activating persulfate through hydroxylamine hydrochloride.

Background

The dye yield of China is the first in the world, the dye is widely applied to industries such as textile, leather, food and the like, a large amount of dye wastewater and printing and dyeing wastewater can be generated in the use process of the dye, and the wastewater has high organic matter concentration, high chroma and strong antibiotic degradability and is difficult to treat by a traditional biochemical method.

Based on sulfate radicals (SO)₄ ^-Mainly), is a new technology developed in recent years at home and abroad, and is one of the most potential advanced oxidation technologies at present. SO (SO)₄ ^-Standard redox potential of 2.5-3.1V, longer oxidation capacity and life compared to hydroxyl radical (. OH), and exhibits specific SO under neutral and alkaline conditions₄ ^-Higher activity, can remove the poisonous and harmful refractory organic pollutants with high efficiency. The persulfate is stable at normal temperature, and can be activated to generate SO in water treatment₄ ^-The main methods include thermal activation, alkali activation, organic activation, transition metal ion activation, zero-valent iron activation, ultraviolet activation, and the like.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide a method for degrading dye wastewater by directly activating persulfate through hydroxylamine hydrochloride, wherein the persulfate is directly activated through the hydroxylamine hydrochloride to generate SO₄ ^-The method has the advantages of simple process, safety and environmental protection for treating the dye wastewater, and solves the problem of secondary pollution in the existing method.

The technical scheme of the invention is as follows:

a method for degrading dye wastewater by directly activating persulfate through hydroxylamine hydrochloride comprises the following specific steps: and adding persulfate and hydroxylamine hydrochloride into the dye wastewater, mixing, adjusting the pH value of the solution, and reacting for 80-100 min at normal temperature and normal pressure.

Further optimizing, wherein the molar ratio of the dye wastewater to the hydroxylamine hydrochloride to the persulfate is 1: 15-40: 10 to 30.

Preferably, the sulfate is sodium persulfate or potassium persulfate.

Further preferably, the dye in the dye wastewater is azo dye and cationic dye.

Further preferably, the azo dyes are golden orange G and acid bright red.

Further preferably, the cationic dye is crocin T.

Further optimizing, adjusting the pH value of the mixed solution to 3-9.

Further optimization, the pH value is preferably adjusted to be 5-9.

The invention has the beneficial effects that:

1. the hydroxylamine hydrochloride is used for directly activating persulfate to form a redox system to generate a strong-oxidizing active substance SO₄ ^-Degrading dye molecules in the wastewater, and having good decolorizing effect on the dye molecules;

2. the method for degrading dye wastewater by directly activating persulfate through hydroxylamine hydrochloride has the advantages of simple process, low cost, mild and safe reaction system, non-toxic and harmless sulfate radical ions as reaction products, no secondary pollution, good removal effect and wide application in the field of water treatment.

Drawings

FIG. 1 shows the effect of adding sodium persulfate and hydroxylamine hydrochloride separately on the degradation rate of orange G;

FIG. 2 is a graph showing the effect of sodium persulfate concentration on the degradation rate of orange G;

FIG. 3 is a graph showing the effect of hydroxylamine hydrochloride concentration on the degradation rate of orange G;

FIG. 4 is a graph showing the effect of initial pH of a solution on the degradation rate of orange G;

FIG. 5 shows the effect of dye species.

Detailed Description

In order to make the technical means, the original characteristics, the achieved objects and the beneficial effects of the invention easy to understand, the invention is further explained by combining the specific embodiments.

Example 1

A method for degrading dye wastewater by activating sodium persulfate with hydroxylamine hydrochloride specifically comprises the steps of placing orange G containing 0.13mmol/L into a triangular flask, adding 5.76 mmol/L hydroxylamine hydrochloride, then adding 1.68mmol/L sodium persulfate, enabling the initial pH value of the solution to be close to 7, reacting for 90min at normal temperature without adjusting the pH value, wherein FIG. 1 is an effect diagram of degrading the orange G respectively by hydroxylamine hydrochloride, sodium persulfate and hydroxylamine hydrochloride/sodium persulfate, and the concentration of the orange G is basically unchanged within 90min of hydroxylamine hydrochloride reaction, which indicates that the single HA does not play a role in degrading the orange G; the degradation rate of the orange G is 10.91 percent within 90min of the reaction of the sodium persulfate, which indicates that the oxidation effect of the sodium persulfate is poor; at room temperature, S₂O₈ ^2-In (2) -O-O-cleavage to form SO₄ ^-The reaction rate is low, so that the effect of oxidizing and degrading pollutants is not obvious; in a hydroxylamine hydrochloride/sodium persulfate system, the degradation rate of the golden orange G is 95.07 percent, which indicates that the sodium persulfate ensures the high efficiency of persulfate oxidation under the action of hydroxylamine hydrochloride.

Example 2

Under the condition that the initial concentration of the golden orange G is 0.13mmol/L, the adding amount of sodium persulfate is 5.79 mmol/L, the initial pH value of the solution is not adjusted, and the degradation rate of the golden orange G under different sodium persulfate conditions is continuously increased along with the increase of initial hydroxylamine hydrochloride as shown in figure 2, wherein the degradation rate reaches 19.35%, 50.11%, 52.53%, 57.26% and 63.85% respectively at 5 min; when the initial concentration of hydroxylamine hydrochloride is increased from 0.84mmol/L to 1.68mmol/L, the degradation rate of the golden orange G is increased from 58.21% to 95.40% when the reaction is carried out for 90 min; when the initial concentration of the sodium persulfate is continuously increased from 3.36mmol/L to 6.30mmol/L, the degradation rate of orange G is over 98 percent at the time of reaction for 30min, thereby indicating that hydroxylamine hydrochloride is generated in the system to generate SO₄ ^-Main source of.

Example 3

The initial concentration of the golden orange G is 0.13mmol/L, the concentration of sodium persulfate is 1.68mmol/L, the pH value of the solution is not adjusted, and as shown in figure 3, the degradation rate of the golden orange G is increased along with the increase of the concentration of hydroxylamine hydrochloride.

Example 4

Placing a golden orange G containing 0.13mmol/L in a triangular flask, adding 5.76 mmol/L hydroxylamine hydrochloride, adding 1.68mmol/L sodium persulfate, and adjusting the initial pH value of the solution to be 3, 5, 7, 9 and 11 respectively, wherein as shown in figure 4, when the pH value is =11, the degradation rate is lowest, and the removal rate is 55.5% after 90min of reaction; the removal rate of the golden orange G is increased along with the increase of the initial pH within the range of pH = 3-9, the removal efficiency of the golden orange G is always kept at a higher level after 90min, and the corresponding degradation rates are 87.5%, 92.3%, 95.9% and 98.2% respectively, which shows that the sodium persulfate/hydroxylamine hydrochloride activation system has a wider application range to the initial pH value of the solution, and the higher degradation rate can be obtained within the range of pH = 3-9.

Example 5

Placing the golden orange G, the acid scarlet 3R and the safranine T with the same initial concentration into 3 triangular flasks respectively, adding 5.76mmmol/L hydroxylamine hydrochloride and 1.68mmol/L sodium persulfate, controlling the temperature to be 25 ℃, not adjusting the initial pH value of the solution, sampling at the same interval, and measuring the absorbance A, wherein the degradation rates of the golden orange G, the acid scarlet 3R and the safranine T are all more than 90% after reacting for 90min as shown in figure 5.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for degrading dye wastewater by directly activating persulfate through hydroxylamine hydrochloride is characterized by comprising the following specific steps: and adding persulfate and hydroxylamine hydrochloride into the dye wastewater, mixing, adjusting the pH value of the solution, and reacting for 80-100 min at normal temperature and normal pressure.

2. The method for directly activating the persulfate so as to degrade the dye wastewater by using the hydroxylamine hydrochloride as claimed in claim 1, wherein the molar ratio of the dye wastewater to the hydroxylamine hydrochloride to the persulfate is 1: 15-40: 10 to 30.

3. The method for directly activating the persulfate to degrade the dye wastewater by using the hydroxylamine hydrochloride according to claim 1, wherein the sulfate is sodium persulfate or potassium persulfate.

4. The method for directly activating the persulfate so as to degrade the dye wastewater by using the hydroxylamine hydrochloride as claimed in claim 1, wherein the dyes in the dye wastewater are azo dyes and cationic dyes.

5. The method for directly activating the persulfate to degrade the dye wastewater by using the hydroxylamine hydrochloride according to claim 4, wherein the azo dyes are golden orange G and acid bright red.

6. The method for directly activating the persulfate so as to degrade the dye wastewater by using the hydroxylamine hydrochloride according to claim 4, wherein the cationic dye has an crock T.

7. The method for directly activating the persulfate to degrade the dye wastewater by using the hydroxylamine hydrochloride according to claim 1, wherein the pH value of the mixed solution is adjusted to 3-9.

8. The method for degrading the dye wastewater by directly activating the persulfate through the hydroxylamine hydrochloride according to claim 7, wherein the pH value is preferably adjusted to be 5-9.