A method for efficiently degrading environmental pollutants in a ferric iron/persulfate system by utilizing red phosphorus

A technology of environmental pollutants and persulfate, applied in the field of environmental pollutant treatment, can solve the problems of affecting PS activation, affecting degradation efficiency, poor cycle stability, etc., and achieve high PS utilization rate, high degradation efficiency, and wide application range of pH Effect

Active Publication Date: 2022-07-26
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, zero-valent iron will also form such as α-FeOOH, α-Fe on its surface during use 2 o 3 And FeO and other substances will also seriously affect the activation of PS
(2) The method of utilizing ferrous iron to activate PS reported in Chinese patent CN109052616A, a large amount of soluble Fe in the PS system 2+ will instantly activate with PS, making SO 4 ·- Released too quickly to be fully utilized by pollutants
In addition, Fe 2+ will be oxidized to Fe 3+ , so that it cannot be reused at all, seriously affecting the degradation efficiency
(3) Chinese patent CN109928482A reports the use of Fe 3 o 4 The method of activating PS with iron oxides can avoid the production of a large amount of iron sludge, but this kind of material has problems such as long catalytic cycle and poor cycle stability in the process of activating PS.
[0004] To sum up, it can be seen that there are still many deficiencies in the use of traditional iron-based materials to activate PS. New PS activation system with high efficiency

Method used

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  • A method for efficiently degrading environmental pollutants in a ferric iron/persulfate system by utilizing red phosphorus
  • A method for efficiently degrading environmental pollutants in a ferric iron/persulfate system by utilizing red phosphorus
  • A method for efficiently degrading environmental pollutants in a ferric iron/persulfate system by utilizing red phosphorus

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 A kind of novel PS activation system comprising red phosphorus

[0030] Take 2.0 g of red phosphorus and 18 mL of ultrapure water, mix well, and then place in a hydrothermal reactor at 200°C for hydrothermal reaction for 16 hours, filter, wash with water, and dry to obtain purified red phosphorus.

[0031] The purified red phosphorus was analyzed by scanning electron microscopy (SEM, Zeiss G-500) and X-ray diffraction (XRD, Rigaku SmartLab), and obtained from figure 1 It can be seen that the purified red phosphorus is irregular particles, and its lattice structure is Amorphous.

[0032]With purified red phosphorus (Red P) and potassium persulfate (PS), FeCl 3 Form a new PS activation system, namely RedP / PS / Fe 3+ system.

Embodiment 2

[0033] Example 2 Determination of Red P / PS / Fe 3+ Removal efficiency and kinetic constant of ibuprofen by the system

[0034] The measurement method is as follows:

[0035] (1) Prepare an ibuprofen solution with a concentration of 20 ppm.

[0036] (2) Take 60mL of ibuprofen solution in step (1) and transfer it into five 100mL beakers respectively, and the reaction systems of these five beakers are respectively set as: PS, Red P, Fe 3+ / PS, Red P / PS, Red P / PS / Fe 3+ . Among them, Red P, PS and Fe 3+ The dosing amounts of 0.2 g / L, 1 mM and 0.2 mM, respectively, were sampled on the set time gradient (0, 5, 10, 15, 20, 25, 30 min) for testing.

[0037] (3) Detect the ibuprofen concentration in the water sample of step (2) with high performance liquid chromatography (HPLC, Thermo Fisher Scientific), the detection wavelength is 223nm, and the mobile phase is phosphoric acid water (pH3.0) / methanol (20 / 80), the flow rate was 1 mL / min, and the peak time was 6.5 min. The calculati...

Embodiment 3

[0041] Example 3 Determination of Red P / PS / Fe 3+ The removal efficiency of the system for different pollutants

[0042] The measurement method is as follows:

[0043] (1) Prepare solutions of ibuprofen (IBU), norfloxacin (NFX), rhodamine B (RhB) and methyl blue (MB) with a concentration of 20 ppm.

[0044] (2) Take 60 mL of the four pollutant solutions in step (1) and transfer them to four 100 mL beakers, respectively, and then add 0.2 g / L red phosphorus, 1 mM PS and 0.2 mM Fe in sequence. 3+ , sample on the set time gradient (0, 5, 10, 15, 20, 25, 30 min) to be tested.

[0045] (3) Detect the ibuprofen concentration in the water sample of step (2) with high performance liquid chromatography (HPLC, Thermo Fisher Scientific), the detection wavelength is 223nm, and the mobile phase is phosphoric acid water (pH3.0) / methanol (20 / 80), the flow rate was 1 mL / min, and the peak time was 6.5 min. Use high performance liquid chromatography to detect the concentration of norfloxacin...

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Abstract

The invention belongs to the technical field of environmental pollutant treatment, and in particular relates to a method for efficiently degrading environmental pollutants in a ferric iron / persulfate system by utilizing red phosphorus. The persulfate activation system includes Red P, potassium persulfate (PS) and ferric (Fe) 3+ ). The persulfate activation system is based on Fe, which is widely present in the water environment. 3+ As a precursor for PS activation, Fe 3+ reduced to Fe 2+ , Fe 2+ Activating PS as an active site generates free radicals to degrade pollutants. At the same time, the newly generated Fe 3+ It will be further reduced by red phosphorus, forming a stable circulation system and promoting the efficient activation of PS. Therefore, the present invention does not need to add unstable Fe 2+ reagents. In addition, the method of the invention has the advantages of high PS utilization rate, wide pH application range, high pollutant degradation efficiency, and can effectively degrade various pollutants and various practical wastewaters.

Description

technical field [0001] The invention belongs to the technical field of environmental pollutant treatment, and in particular relates to a method for efficiently degrading environmental pollutants in a ferric iron / persulfate system by utilizing red phosphorus. Background technique [0002] In recent years, environmental pollutants (including anti-inflammatory drugs, antibiotics, organic dyes, etc.) have been widely used in daily life and industrial production, making them widely exist in the environment, especially in the water environment and its impact on aquatic organisms The harm has aroused widespread concern around the world. Studies have shown that using persulfate (PS) activation to generate sulfate radicals (SO 4 ·- ) advanced oxidation technology can effectively deal with refractory environmental pollutants. Compared to traditional Fenton technology and ozone (O 3 ) oxidation technology, PS activation technology is inexpensive and has high stability in storage an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F1/70
CPCC02F1/72C02F1/722C02F1/70
Inventor 胡卓锋郑宁超胡睿婷何茜
Owner SUN YAT SEN UNIV
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