Method for treating organic wastewater through synergistic activation of persulfate using electrochemistry and Ni-Fe-LDH/rGO catalyst

A technology for activating persulfate and organic wastewater, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. Reduced effect, decreased activation ability, etc., to achieve the effect of reducing processing cost, good magnetic properties and stability, and enhancing catalytic activity

Inactive Publication Date: 2016-07-06
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the invention patent CN102249378B disclosed "a method of electrochemically synergistically treating organic wastewater with persulfate", the Fe 3+ reduced to Fe 2+ , continuous activation of persulfate, but due to the addition of iron salts, iron sludge and ferrous ion residues will be produced in the system, and the system needs to be carried out under a large current, which consumes a lot of energy; the invention patent CN104787853A discloses "a An electrochemical synergistic activated carbon activated persulfate treatment method for organic wastewater" is to strengthen the degradation effect of activated carbon activated persulfate by electric field, but the degradation effect of this system is significantly reduced when the pH is greater than 5, and activated carbon is activated after repeated use for four times. Ability is also significantly reduced

Method used

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  • Method for treating organic wastewater through synergistic activation of persulfate using electrochemistry and Ni-Fe-LDH/rGO catalyst
  • Method for treating organic wastewater through synergistic activation of persulfate using electrochemistry and Ni-Fe-LDH/rGO catalyst
  • Method for treating organic wastewater through synergistic activation of persulfate using electrochemistry and Ni-Fe-LDH/rGO catalyst

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Experimental program
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Effect test

Embodiment 1

[0025] Effect of Ni-Fe-LDH / rGO Catalyst Dosage on RhB Removal Efficiency

[0026] Test conditions: the concentration of RhB is 20mg / L; the initial pH is 6.8; the dosage of oxidant is 1.0g / L; the current density is 19.53mA / cm2 ; The dosage of Ni-Fe-LDH / rGO catalyst was 0.5g / L, 1.0g / L, 1.5g / L and 2.0g / L respectively.

[0027] Experimental results such as figure 1 shown. The results showed that the degradation effect first increased and then remained unchanged with the increase of catalyst dosage, and the optimal dosage of Ni-Fe-LDH / rGO catalyst was 1.0g / L.

Embodiment 2

[0028] The influence of embodiment 2 oxidant dosage on RhB removal effect

[0029] Test conditions: the concentration of RhB is 20mg / L; the initial pH is 6.8; the dosage of Ni-Fe-LDH / rGO catalyst is 1.0g / L; the current density is 19.53mA / cm 2 ; The dosage of oxidizing agent is respectively 0.5g / L, 1.0g / L, 1.5g / L and 2.0g / L.

[0030] Experimental results such as figure 2 shown. The results showed that the degradation effect showed a trend of first increasing and then decreasing with the increase of the dosage of oxidizing agent, because excessive oxidizing agent would consume the produced sulfate radicals to reduce the degradation effect, therefore, the optimum dosage of oxidizing agent was 1.0 g / L.

Embodiment 3

[0031] The influence of embodiment 3 current density on RhB removal effect

[0032] Test conditions: the concentration of RhB is 20mg / L; the initial pH is 6.8; the dosage of Ni-Fe-LDH / rGO catalyst is 1.0g / L; the dosage of oxidant is 1.0g / L; the current density is 4.88mA / cm 2 、9.76mA / cm 2 、19.53mA / cm 2 、29.29mA / cm 2 and 39.06mA / cm 2 .

[0033] Experimental results such as image 3 shown. The results showed that the degradation effect showed a trend of first increasing and then decreasing with the increase of current density, and too high current density would cause side reactions, resulting in the evolution of hydrogen gas at the cathode. Therefore, the optimum current density is 19.53mA / cm 2 .

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Abstract

The invention provides a method for treating organic wastewater through synergistic activation of persulfate using electrochemistry and a Ni-Fe-LDH / rGO catalyst. The method comprises the specific steps: adding persulfate and the Ni-Fe-LDH / rGO catalyst in an electrolysis device containing organic wastewater, degrading the organic wastewater under the effect of external electric field, providing a constant current for the electrolysis process by using a constant potential rectifier, using 0.1M of Na2SO4 as a support electrolyte in the electrolysis process, and continuously performing magnetic stirring in the test process so as to guarantee the sufficient contact of the catalyst and solution. The method not only can activate the persulfate through the electrochemical manner, but also can enhance the capability of the original catalyst to activate the persulfate, and multiple paths are used for synergistically degrading the organic pollutants. The method is simple in operation, flexible in reaction, high in catalysis efficiency, and good in degradation effect; the catalyst has good magnetism and stability, and has wide application prospect in the environment pollution governance field.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to a method for electrochemically cooperating with Ni-Fe-LDH / rGO catalyst to activate persulfate to treat organic wastewater. Background technique [0002] As an environmentally friendly technology, advanced oxidation technology is widely used in the field of wastewater treatment. Although H 2 o 2 The advanced oxidation technology as an oxidant can achieve the degradation of most organic pollutants, but due to the H 2 o 2 There are disadvantages such as instability, difficulty in storage and transportation, harsh reaction conditions, and inability to effectively degrade organic substances such as perfluorocarboxylic acids, which limit its application. Therefore, the advanced oxidation technology based on sulfate radicals came into being. The key to this technology is to be able to efficiently and stably activate persulfate to generate sulfate radicals...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461B01J23/755
CPCC02F1/4672B01J23/755C02F2305/023
Inventor 李彦芳张国权杨凤林
Owner DALIAN UNIV OF TECH
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