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Method for degrading organic pollutants by Pd/TiN particles cooperating with electrochemistry

An organic pollutant and electrochemical technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of high energy consumption and poor degradation effect, and achieve the effect of improving the degradation effect

Pending Publication Date: 2021-06-22
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems of poor degradation effect and high energy consumption of other advanced oxidation technologies, the present invention provides a method for Pd / TiN granular electrodes to activate PDS to electrochemically degrade organic pollutants, which has the advantages of high efficiency, energy saving, environmental protection, and wide application

Method used

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  • Method for degrading organic pollutants by Pd/TiN particles cooperating with electrochemistry
  • Method for degrading organic pollutants by Pd/TiN particles cooperating with electrochemistry
  • Method for degrading organic pollutants by Pd/TiN particles cooperating with electrochemistry

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1, adopt NaBH 4 Preparation of Pd / TiN Particles by Reduction Process

[0029] 0.177g (0.001mol) PdCl 2 The powder was stirred and dissolved in 1000 mL of 0.1755 g / L (containing NaCl 0.003 mol) NaCl aqueous solution at a molar ratio of 1:3 to obtain 1 mM PdCl 2 solution as a Pd precursor. Weigh 495mg (0.008mol) of TiN into a 250mL three-neck flask, then add 50mL of ultrapure water, ultrasonically in an ultrasonic cleaner for 10min to disperse the powder evenly, then add 50mL of PdCl 2 solution, and stirred under 300r / min mechanical stirring for 1h, and adjusted the pH to 10 with 1M NaOH aqueous solution. Then add 10mL 1M NaBH dropwise 4 Aqueous solution, continuously stirred for 3h, after the stirring was completed, the mixture was filtered, the filter cake was washed with ultrapure water to neutrality (pH 7), and then dried under vacuum at 60°C for 12h to finally obtain Pd with a mass loading of 1%. / TiN particles 0.5 g. In order to prove that the cata...

Embodiment 2

[0030] The impact of embodiment 2 different degradation modes on the degradation of diclofenac sodium

[0031] 1. Electrolytic reaction

[0032] Carried out in a 250mL cylindrical single-chamber electrolyzer, with Ti 4 o 7 An electrode (1.5cm*2cm, purchased from Changsha Purong Chemical Co., Ltd.) was used as the anode, a Ti sheet (1.5cm*2cm) was used as the cathode, and the distance between the electrodes was fixed at 1cm. Take 200ml of electrolyte and add it to the electrolytic cell, and apply 10mA / cm on the anode 2 The DC current is supplied by a DC digital power supply. Electrolysis reaction at 25°C for 2h. Every 30min, adopt sampling needle to get 1.5ml sample from reaction solution, filter by 0.22 μ m polypropylene membrane and measure sample peak area by high performance liquid chromatography (HPLC), obtain diclofenac sodium concentration in the sample according to diclofenac sodium standard curve, and then Calculate the degradation rate of diclofenac sodium.

[0...

Embodiment 3

[0043] Example 3 Effects of different Pd / TiN dosages on the degradation of diclofenac sodium

[0044] Change the dosage of Pd / TiN in the electrochemical-Pd / TiN-PDS system in Example 1 to 0.05, 0.1, 0.25, 0.5 g / L respectively, and other operations are the same as in Example 1. The experimental results are shown in Table 1. As the dosage of Pd / TiN increased from 0.05g / L to 0.25g / L, the degradation rates of diclofenac sodium were 77.5%, 94.3% and 97.3%, respectively. When Pd / TiN When the dosage of diclofenac sodium was further increased to 0.5g / L, the degradation rate of diclofenac sodium decreased to 52.5%. Among them, when the dosage of Pd / TiN is 0.1, 0.25g / L, the degradation rate of diclofenac sodium is 94.3% and 97.3%, respectively, the difference is not big, so we choose the low dosage of 0.1g / L is the best value.

[0045] Table 1. Effects of different Pd / TiN dosages on the degradation of diclofenac sodium

[0046] Dosage (g / L) 0.05 0.1 0.25 0.5 Degrada...

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Abstract

The invention discloses a method for degrading organic pollutants by Pd / TiN particles cooperating with electrochemistry. The method is characterized by comprising the following steps: taking Ti4O7 as an anode and a Ti sheet as a cathode, adding electrolyte containing the organic pollutants, and applying direct current with the current density of 2.5-10mA / cm < 2 > to the anode at 10-30 DEG C for reaction to realize degradation of the organic pollutants. The electrolyte is prepared from the following components: 1 to 20 mmol / L of organic pollutants, 1 to 50 mmol / L of Na2SO4, 0.01 to 10 mmol / L of peroxydisulfate, 0.05 to 0.5 g / L of Pd / TiN and water serving as a solvent, and the pH of the electrolyte is 6.0. The Pd / TiN particles are added on the basis of electrochemical activation of PDS, the degradation effect of organic pollutants can be greatly improved, the degradation rate of diclofenac sodium reaches 97.3%, and complete degradation of the pollutants is achieved.

Description

[0001] (1) Technical field [0002] The invention relates to the technical field of electrochemical advanced oxidation treatment of pollutants, in particular to a method for Pd / TiN particle electrodes to activate peroxodisulfate (PDS) and electrochemically degrade organic pollutants. [0003] (2) Background technology [0004] With the development of modern industry faster and faster, the production and use of chemicals have increased, so many compounds including chlorinated aromatic and aliphatic compounds (chlorobenzene, tetrachloride) have been increasingly detected in groundwater and surface water Chlorophenols) and phenolic compounds (phenols, chlorophenols and nitrophenols) and other refractory organic pollutants. These substances are potential human carcinogens due to their persistence, toxicity, potential for long-distance transport and tendency to bioaccumulate. They are widely used in the manufacturing process of plastics, dyes, pharmaceuticals, pesticides and paper....

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F101/36
CPCC02F1/461C02F2101/36C02F2001/46142C02F2201/46
Inventor 楼子墨王佳哲姚蕾於建明胡俊高翌戎
Owner ZHEJIANG UNIV OF TECH
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