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Method for treating organic wastewater by activating peroxymonosulfate with assistance of visible light

An organic wastewater, monosulfate technology, applied in chemical instruments and methods, oxidized water/sewage treatment, special compound water treatment, etc., can solve the problem of narrow pH range, secondary pollution of transition metal ions, stable metal ion leakage and circulation To achieve the effect of promoting high-efficiency degradation and promoting high-speed degradation

Pending Publication Date: 2022-01-14
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing studies use transition metal ions and persulfates to construct homogeneous advanced oxidation systems, but these systems will inevitably lead to secondary pollution of transition metal ions, and the applicable pH range is narrow (generally under acidic conditions), and If the pH is too high, it is easy to produce precipitation and form metal slime; it has also been reported that transition metal oxides and persulfates can be used to construct a heterogeneous advanced oxidation system, but it still cannot solve the problems of metal ion leakage and poor cycle stability.

Method used

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  • Method for treating organic wastewater by activating peroxymonosulfate with assistance of visible light
  • Method for treating organic wastewater by activating peroxymonosulfate with assistance of visible light
  • Method for treating organic wastewater by activating peroxymonosulfate with assistance of visible light

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1: Preparation of carbon nitride material

[0050] Weigh 20 g of urea into a covered crucible, then place it in a muffle furnace, and raise the temperature to 550°C at a heating rate of 2.5°C / min, keep it warm for 4 hours, then cool to room temperature, and grind to obtain a light yellow solid Powdered carbon nitride material.

[0051] The phase characterization results, scanning electron micrographs and high-resolution transmission electron micrographs of carbon nitride are as follows: figure 1 , figure 2 and image 3 shown by figure 1 It can be seen that C, N and O elements can be found in the X-ray photoelectron spectrum at the same time, which is consistent with the main elements in their own structure; figure 2 It can be seen that the synthesized carbon nitride material is composed of multiple sheets, and these sheets are stacked together to form an irregular nanosheet structure. Compared with the traditional bulk carbon nitride, its specific surfa...

Embodiment 2

[0052] Example 2: Application of carbon nitride-peroxymonosulfate system to remove rhodamine B in water

[0053] Add the carbon nitride material powder obtained in Example 1 into the solution with Rhodamine B as the treatment object, and the dosage is 0.2 g / L. Add 0.5 mM peroxymonosulfate under magnetic stirring, and turn on the xenon lamp to react. Figure 4 In order to test the degradation kinetics curves of different concentrations of Rhodamine B in the carbon nitride material-peroxymonosulfate system, it can be seen from the figure that within 12 minutes, Rhodamine B with a concentration within 50 mg / L can be effectively The removal rate of rhodamine B at a concentration of 100 mg / L was less than 40%.

Embodiment 3

[0054] Embodiment 3: recycling of carbon nitride materials

[0055] The carbon nitride material of processing 10 mg / L rhodamine B solution in embodiment 2 is reclaimed and reused, and the rhodamine B concentration is restored to 10 mg / L by continuing to add high-concentration rhodamine B solution, and cast under magnetic stirring Add 0.5mM persulfate, turn on the xenon lamp to react. After 12 minutes of reaction, the removal rate of Rhodamine B was detected. Repeatedly add rhodamine B and peroxymonosulfate to the reactor according to the above scheme, and monitor the removal rate of rhodamine B after 12 minutes until the catalytic ability decreases and the rhodamine B in the solution cannot be effectively degraded. Figure 5 It is the removal rate of rhodamine B by activation of peroxymonosulfate within 12 min of each cycle of the carbon nitride material. It can be seen from the figure that the carbon nitride material shows good stability in the first 9 cycles.

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Abstract

The invention discloses a method for treating organic wastewater by activating peroxymonosulfate with assistance of visible light, wherein the method comprises the steps: adding a carbon nitride material into the organic wastewater, adding peroxymonosulfate into the organic wastewater, and degrading organic pollutants in the wastewater under the assistance of visible light, so as to remove the organic pollutants in the wastewater. The method can be used for efficiently removing organic pollutants such as phenols and dyes in the organic wastewater, is wide in applicable pH range, does not generate transition metal ions and sulfates, is environment-friendly and has a good practical application prospect.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a method for treating organic wastewater by activating peroxysulfate assisted by visible light. Background technique [0002] With the development of social productivity, more and more organic matter is used in industrial and agricultural production, and the discharge and release of these organic matter has caused many environmental problems. Many organic substances are difficult to degrade and even affect microbial activity in traditional biological treatment processes. If they are not disposed of properly, they will cause harm to public health and the ecological environment. Advanced oxidation technology is usually used to efficiently and rapidly oxidize and degrade the above-mentioned organic pollutants with high chemical stability. However, the actual application scenarios of existing advanced oxidation systems are still limited. For example, the reaction of advance...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/30B01J27/24B01J27/28B01J38/00C02F101/30C02F101/34
CPCC02F1/725C02F1/722C02F1/30B01J27/24B01J27/28B01J38/00C02F2101/308C02F2101/345C02F2305/023B01J35/39Y02W10/37
Inventor 陈飞朱柯安袁潮苇
Owner CHONGQING UNIV
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