Method for removing phenylurea herbicide chlortoluron in water by using ultraviolet/persulfate combined process

A persulfate and combined process technology, applied in water/sewage treatment, chemical instruments and methods, special compound water treatment, etc., can solve the problem that it is difficult to meet the discharge requirements, the degradation effect of chloromylon is small, and the green myelon cannot be effectively removed. Mellon and other problems, to achieve the effect of easy control of reaction parameters, lower concentration, and simple operation

Inactive Publication Date: 2020-11-17
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in conventional water treatment, the degradation effect of chlorotoluron is very little, and the traditional treatment process cannot effectively remove chlorotoluron in water, and it is difficult to meet the discharge requirements. This requires improving the existing removal and degradation technology, and developing a fast, Efficient degradation method

Method used

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  • Method for removing phenylurea herbicide chlortoluron in water by using ultraviolet/persulfate combined process
  • Method for removing phenylurea herbicide chlortoluron in water by using ultraviolet/persulfate combined process
  • Method for removing phenylurea herbicide chlortoluron in water by using ultraviolet/persulfate combined process

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Embodiment 1

[0047] A method for removing the phenylurea herbicide chlorotoluron in water by an ultraviolet / persulfate combined process, comprising the following steps:

[0048] Use ultrapure water to configure the initial concentration of chlorotoluron as 8 μM, add phosphate buffer solution, and use NaOH and H under the combined process of UV / persulfate 2 SO 4 Adjust the initial pH of the chlorotoluron solution to 7, add persulfate solution to the chlorotoluron solution, so that the dosage of persulfate is 160 μM, and carry out ultraviolet irradiation at the same time, and control the ultraviolet irradiation intensity to 2.43mW / cm 2 , the reaction temperature was controlled at 25°C.

[0049] The curves of the chlorotoluron concentration over time under the three processes of independent ultraviolet irradiation (comparative example 2), independent persulfate oxidation (comparative example 1) and ultraviolet / persulfate combined process (embodiment 1) are as follows figure 1 shown.

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Embodiment 2

[0052] A method for removing the phenylurea herbicide chlorotoluron in water by an ultraviolet / persulfate combined process, comprising the following steps:

[0053] Use ultrapure water to prepare the initial concentration of chlorotoluron as 8 μM, and use NaOH and H 2 SO 4 Adjust the initial pH of the chlorotoluron solution to 7, add persulfate solution to the chlorotoluron solution, control the initial addition of persulfuric acid to make the concentrations respectively 0, 40, 80, 160, 240 and 400 μM, and carry out ultraviolet irradiation at the same time, Control the UV intensity to 2.43mW / cm 2 , after 5 minutes of reaction, the removal rate of chlorotoluron is detailed in figure 2 .

[0054] From figure 2 It can be seen that with the increase of persulfate dosage, the removal rate of chlorotoluron is significantly accelerated. Under the condition that the ultraviolet intensity remains constant, with the increase of the dosage of persulfate in the system, the SO produ...

Embodiment 3

[0056] A method for removing the phenylurea herbicide chlorotoluron in water by an ultraviolet / persulfate combined process, comprising the following steps:

[0057] Use ultrapure water to configure the initial concentration of chlorotoluron to 8 μM, and use NaOH and H 2 SO 4 Adjust the initial pH of the chlorotoluron solution to 7, add persulfate solution to the chlorotoluron solution to make the concentration 160μM, and carry out ultraviolet irradiation at the same time, and control the ultraviolet intensity to be 2.43, 4.94, 7.34 and 9.79mW / cm respectively 2 , at a temperature of 25°C, the basic degradation times of chlorotoluron are 90s, 150s, 270s, and 300s, respectively.

[0058] From image 3 It can be seen that with the gradual increase of the intensity of ultraviolet light, the degradation rate of chlorotoluron gradually increased. When the intensity of ultraviolet light increases, the photon energy in the solution increases, and the SO produced by persulfate irradi...

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Abstract

The invention relates to a method for removing a phenylurea herbicide chlortoluron in water by an ultraviolet/persulfate combined process. The method comprises the following specific steps: (1) pretreating a water sample containing impurities; and (2) adding a persulfate solution into the pretreated water sample, adjusting the pH value, and carrying out photodegradation on the water sample by using ultraviolet lamp illumination to remove the phenylurea herbicide chlortoluron in the water. Compared with the prior art, the chlortoluron removal effect can reach 99% or above, the concentration ofdegradation-resistant harmful substances in water is effectively reduced, operation is easy, reaction conditions are easy to control, adopted chemical reagents and materials are conventional productsfor water treatment, other toxic and harmful substances are not introduced, and the method is outstanding in safety and practicability. The reaction environment is easy to realize, treatment can be performed at room temperature, so that feasibility and operability of the method are effectively improved.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for removing chlorotoluron, a commonly used phenylurea herbicide in water, by an ultraviolet / persulfate combined process. Background technique [0002] Chlorotoluron is a low-toxicity, high-efficiency, broad-spectrum selective systemic conduction type phenylurea herbicide, which is absorbed through the root system of plants, has soil residual activity and leaf contact activity, and has top and base transport sex. Mainly by inhibiting the photosynthesis of weed leaves, it achieves the purpose of controlling annual grass weeds and some broad-leaved weeds. It is basically safe for wheat, corn, etc., but excessive dosage or long-term application may easily cause phytotoxicity. It is less safe for peanuts, soybeans, and cotton, and may easily cause phytotoxicity. [0003] Chlorotoluron is basically stable to heat and ultraviolet rays, and can be slowly decomposed wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/72C02F101/30C02F101/36
CPCC02F1/32C02F1/722C02F2101/306C02F2101/36C02F2303/04C02F2305/02C02F2305/023
Inventor 胡晓钧赖璠陈晨田富箱叶文凯
Owner SHANGHAI INST OF TECH
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