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Method for degrading organic pollutants in water by ionization irradiation

A technology of organic pollutants and ionizing radiation, applied in water pollutants, light water/sewage treatment, water/sewage treatment, etc., can solve the problems of high radiation absorbed dose, low removal effect, affecting economical application, etc. To achieve the effect of wide application, broad application prospects, efficient degradation and mineralization

Active Publication Date: 2020-05-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the radiation absorption dose required to mineralize organic pollutants is relatively high, which affects its economical application
Moreover, the concentration of these emerging organic pollutants in water bodies is usually low. When dealing with actual water bodies, dissolved organic matter (DOM) and CO 3 2- , NO 3 - Isoanions, which compete with organic pollutants for free radicals produced by irradiation, significantly affect the removal rate and mineralization rate of organic pollutants by ionizing radiation, and their removal effect is significantly lower than that of pure water systems. Further development of efficient ionizing radiation Synergistic Reinforcement Technology

Method used

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  • Method for degrading organic pollutants in water by ionization irradiation

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Comparison scheme
Effect test

Embodiment 1

[0041] MIL-88B(Fe) was prepared by one-step solvothermal method. The reaction raw material is FeCl 3 ·6H 2 O, terephthalic acid (H 2 BDC), N,N-dimethylformamide (DMF) and NaOH, reacted at 100°C for 12h, cooled naturally, washed, and dried in vacuum at 50°C for 12h.

[0042] Dissolve a certain amount of cephalosporin C sodium salt in groundwater to prepare a cephalosporin C solution with an initial concentration of 0.18mM and a pH value of 5.4. Then add 0.5g / L MIL-88B(Fe) and mix well. The mixed solution of described cephalosporin C and MIL-88B (Fe) is put into the irradiation container, adopts Co60 Gamma rays (radiation activity 3.6×1014Bq) were irradiated at a dose rate of about 30Gy / min. The absorbed dose was controlled at 0.2, 0.4, 0.6, 1.0 and 2.0kGy by adjusting the irradiation time. After the irradiation, the solution was centrifuged and precipitated to recover MIL-88B(Fe), and the supernatant was filtered through a 0.45 μm filter membrane to detect the concentratio...

Embodiment 2

[0046] Preparation of iron-based MOF-derived materials:

[0047] Firstly, MIL-100(Fe) was synthesized by one-step solvothermal method. The reaction raw materials are Fe powder, trimesic acid (H 3 BTC), HNO3 and HF, etc., reacted at 150°C for 24h, cooled naturally, washed, and dried in vacuum at 70°C for 12h. Calcination and carbonization are then carried out at a temperature of 780°C for 2 hours of reaction. Programmed temperature, argon protection.

[0048] A certain amount of cephalosporin C sodium salt was dissolved in deionized water to prepare a cephalosporin C solution with an initial concentration of 20 mg / L and a pH value of 6.1. Then add 0.5 g / L of iron-based MOF derivative material and mix well. Put the mixture of the cephalosporin C solution and the iron-based MOF derivative material into the irradiation container, and use Co 60 Gamma rays (radiation activity 3.6×1014Bq) were irradiated at a dose rate of about 30Gy / min. The absorbed dose was controlled at 0.1,...

Embodiment 3

[0052] The preparation method of the iron-based MOF derived material is the same as in Example 2.

[0053] Dissolve a certain amount of sulfamethazine in deionized water to prepare a sulfamethazine solution with an initial concentration of 20 mg / L and a pH of 5.7. Then add 0.5 g / L of iron-based MOF derivative material and mix well. Put the mixture of the sulfamethazine solution and the iron-based MOF derivative material into an irradiation container, and use Co60γ rays (radiation activity 3.6×10 14 Bq) was irradiated at a dose rate of about 30Gy / min. The absorbed dose was controlled at 0.1, 0.2, 0.4, 0.6 and 1.0kGy by adjusting the irradiation time. After the irradiation, the solution was centrifuged and precipitated to recover the iron-based MOF derivative material. After the supernatant was filtered through a 0.45 μm filter membrane, the concentrations of sulfamethazine and TOC were detected. Sulfamethazine solutions without iron-based MOF-derived materials were simultane...

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Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a method for removing degradation-resistant organic pollutants in water by enhanced ionization irradiation. The method comprises the following steps: uniformly mixing wastewater containing organic pollutants with a certain amount of MOF or derivative materials thereof, and carrying out ionization irradiation treatment. The method is high in irradiation efficiency and can be carried out at normal temperature; the MOF material can be repeatedly used; and the method can be applied to treatment of urban sewage plant effluent, pharmaceutical wastewater, dye wastewater and other degradation-resistant industrial wastewater.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a method for removing refractory organic pollutants in water by strengthening ionizing radiation. Background technique [0002] In recent years, the residue and pollution of emerging organic pollutants represented by pharmaceuticals and personal care products (PPCPs), pesticides and industrial chemicals in water bodies have attracted widespread attention from all over the world. At extremely low concentrations, these substances can cause toxic effects such as "three causes", microbial resistance, reproductive system disorders, etc., causing potential harm to the water environment and human health. Refractory organic pollutants such as PPCPs have high toxicity and low concentration, and it is difficult to effectively remove them by conventional methods. There remains a need in the art for an improved method of effectively removing refractory organic pollutants in water. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30G21H5/00C02F101/30C02F103/34
CPCC02F1/30C02F1/307C02F2101/30C02F2103/34C02F2103/343G21H5/00
Inventor 王建龙初里冰
Owner TSINGHUA UNIV
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