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A kind of method that utilizes metal organic framework fe(nic) to activate persulfate with high efficiency to treat organic wastewater

A metal-organic framework and activated persulfate technology, applied in chemical instruments and methods, oxidized water/sewage treatment, special compound water treatment, etc., can solve the problem of insufficient content of iron-based MOFs, low structure-effectiveness, and catalytic persulfate Poor activity and other problems, to achieve the effect of strong activity, good structure and performance, and high content of active sites

Active Publication Date: 2021-05-18
DONGGUAN UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the existing iron-based MOFs due to Fe 2+ Insufficient content leads to technical problems such as low structure-effectiveness and poor catalytic persulfate activity, and a method for using ferrous metal-organic framework Fe(Nic) to activate persulfate to treat organic wastewater is provided.

Method used

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  • A kind of method that utilizes metal organic framework fe(nic) to activate persulfate with high efficiency to treat organic wastewater
  • A kind of method that utilizes metal organic framework fe(nic) to activate persulfate with high efficiency to treat organic wastewater
  • A kind of method that utilizes metal organic framework fe(nic) to activate persulfate with high efficiency to treat organic wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Metal-organic framework Fe(Nic) activates PS to treat sulfamethoxazole (SMX) simulated wastewater. The specific operation steps are as follows:

[0040] (1) Preparation of the catalyst: Weigh 234mg (0.625mmol) of [Fe(Cp)(CO) 2 ] 2 and 310 mg (2.5 mmol) of HNic were poured into 35 mL of CH 3 CN / H 2 In a mixed solvent of O (v / v=4 / 3), stir for 2 h to mix well. The precursor solution was poured into a 100mL polytetrafluoroethylene-lined autoclave, and placed in an electric thermostat blast drying oven preheated to 160°C. After 48 hours, the reactor was taken out and cooled to room temperature naturally. Filter to separate the solid from the liquid, and simultaneously wash the solid alternately with methanol and deionized water. Finally, the above solid was dried in a vacuum oven at 85° C. for 48 hours to obtain the metal organic framework Fe(Nic).

[0041] (2) Degradation of SMX simulated wastewater: 250mL Erlenmeyer flask was used as the reaction bottle to prepare si...

Embodiment 2

[0047] With the Fe(Nic) prepared in Example 1 as catalyst, PS as oxidant, the initial concentration of SMX simulated wastewater is 10mg / L, without adjusting the pH of wastewater, four treatment groups are set: after adding 0.475g / L sodium persulfate, respectively Add ferrous metal organic framework catalyst 0.1g / L (treatment group 1), 0.3g / L (treatment group 2), 0.5g / L (treatment group 3), 1.0g / L (treatment group 4), under 25 ℃ 180rpm constant temperature shaking shaker fully stirred for reaction, reaction 5min, 10min, 20min, 30min, 45min, 60min, 90min, 120min and 180min respectively sampling and determination of SMX residual concentration value, the results are shown in the table 2.

[0048] Table 2

[0049]

[0050] The results in Table 2 show that the dosage of Fe(Nic) has an effect on the efficiency of activating PS to oxidize and degrade SMX simulated wastewater. Within a certain range, the SMX degradation rate increases with the increase of the catalyst dosage: when...

Embodiment 3

[0052] Adopt 250mL Erlenmeyer flask as reaction bottle, preparation initial concentration is the SMX simulated waste water of 10mg / L, with the Fe(Nic) that embodiment 1 prepares as catalyst, PS is oxygenant, does not adjust waste water pH, arranges five treatment groups: respectively In four groups of reaction bottles, add 190mg / L (treatment group 1), 237.5mg / L (treatment group 2), 356.25mg / L (treatment group 3), 475mg / L (treatment group 4), 950mg / L (treatment group Group 5) Sodium persulfate, then add 0.5g / L ferrous metal-organic framework material to all treatment groups, and fully stir the reaction in a constant temperature shaking shaker at 180rpm at 25°C. React for 5min, 10min, 20min, 30min , 45min, 60min, 90min, 120min and 180min respectively took samples and measured the remaining concentration of SMX, and the residual concentration of PS in wastewater was measured at the same time in treatment groups 2 and 4. The results are shown in Table 3.

[0053] table 3

[0054]...

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Abstract

The invention discloses a method for activating persulfate by utilizing a metal-organic framework with high ferrous active site content and its application in treating organic wastewater. In the method, Fe(Nic) is used to catalyze and activate persulfate in aqueous solution to generate strong oxidizing free radicals, so that pollutants in water can be oxidized, degraded and removed. Compared with conventional iron-based metal-organic frameworks, Fe(Nic) has a high content of ferrous active sites and has strong structure and efficiency. As an electron donor, it can activate persulfate to generate abundant sulfate radicals and hydroxyl radicals. The activation reaction efficiency is high, the free radical yield and utilization rate are high, and the pollutant degradation rate is high. The method provided by the invention has the advantages of simple process, mild condition, easy control, wide adaptability to wastewater pH value and good treatment effect. It is suitable for the treatment of various organic wastewater, and provides a new idea for the use of metal organic framework materials to treat pollutants in water.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to the application of a method for catalyzing and activating persulfate by utilizing a metal organic framework Fe(Nic) in treating organic wastewater. Background technique [0002] With the continuous prosperity of the economy and the rapid development of industry, the problem of water pollution has become increasingly prominent, seriously threatening the ecological environment and human health, and technologies to strengthen water pollution control are emerging. to generate sulfate radicals (SO 4 - ·) Persulfate (PS, persulfate) advanced oxidation technologies (Advanced Oxidation Technologies, AOTs) as the main active species due to SO 4 - · Oxidation-reduction potential (E 0 =+2.5~3.1v) high, long half-life (t 1 / 2 ≈4s), low quenching reactivity, easy to capture electrons on the benzene ring of pollutants, high utilization rate of free radicals in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72B01J31/22C02F101/38C02F101/34
CPCB01J31/1691B01J31/2243B01J2531/842C02F1/722C02F1/725C02F2101/34C02F2101/38C02F2101/40C02F2305/026
Inventor 牛军峰濮梦婕张峰振
Owner DONGGUAN UNIV OF TECH
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