Method for removing chlorine in chlorinated organic pollutant through electrochemistry method

A pollutant and electrochemical technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of less microbial species, reduced biodegradability, poor degradation effect, etc., and achieve dechlorination efficiency high effect

CN101648736AInactive Publication Date: 2010-02-17SHANDONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2010-02-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for removing chlorine in chlorinated organic pollutant through electrochemistry method, and the method comprises the following steps: using a three-electrode system which adopts glassy carbon electrode modified with core-shell nanoscale bimetallic Fe / Pd catalyst as working electrode to perform cyclic voltammetry sweep in a mixed solution of H2SO4 solution and CCl4and determine the range of hydrogen region; and (2) electrolyzing for a period of time in the mixed solution of H2SO4 solution and CCl4 under the constant potential according to the determined range of hydrogen region. The method uses couple corrosion between Pd and Fe so as to accelerate the adsorption of hydrogen on Pd, the method is applicable to the fast chlorine-removing of chlorinated organic material at room temperature and normal pressure under the strong acid condition and the dechlorination efficiency is high.
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Description

technical field

[0001] The invention relates to a method for dechlorinating organic chlorinated pollutants, in particular to a method for electrochemically dechlorinating organic chlorinated pollutants by using a core-shell nano-Fe / Pd catalyst, belonging to the technical field of water pollutant treatment . Background technique

[0002] Organic chlorinated compounds (such as carbon tetrachloride, etc.) are common organic pollutants in environmental water. Its treatment methods can generally be divided into physical methods, biological methods, and chemical methods (divided into chemical oxidation and chemical reduction). The cost of the physical method is relatively high, and generally the pollutants are only transferred from one phase to another, and the pollutants are not completely degraded; the research on biodegradation technology has a long history, but due to the presence of chlorine in organic matter, the biodegradability It is greatly reduced, and there are few co...

Examples

Embodiment 1

[0024] Preparation of glassy carbon electrode modified with core-shell nano bimetallic Fe / Pd catalyst:

[0025] First polish the glassy carbon electrode with 3500# metallographic sandpaper, and then polish the mirror surface of the paper with 0.5μm alumina powder. Before the experiment started, the glassy carbon electrode was first placed in HNO 3 Solution (HNO 3 :H 2 (O volume ratio 1:1) ultrasonic 5min, and then rinse with ultrapure water. The electrochemical experiments were all carried out in the electrolytic cell of the traditional three-electrode system: a clean glassy carbon electrode was used as the working electrode, a Pt sheet was used as the counter electrode, and a saturated calomel electrode was used as the reference electrode.

[0026] NaCl and FeCl 2 The mixed solution of NaCl is used as the deposition solution, and the concentration of NaCl is 0.25mol dm -3 , FeCl 2 The concentration is 10mmol dm -3 , control the temperature at 30°C, and deposit a large ...

Embodiment 2

[0029] Method for electrochemical dechlorination of organic chlorinated pollutants:

[0030] The glassy carbon electrode modified with the core-shell nano-bimetallic Fe / Pd catalyst prepared in Example 1 is used as the working electrode, the Pt sheet is used as the counter electrode, and the saturated calomel electrode is used as the three-electrode system of the reference electrode, respectively at 0.5 mol dm -3 h 2 SO 4 solution, H 2 SO 4 solution with CCl 4 Mixed solution (0.5mol dm -3 h 2 SO 4 , 30 mg dm -3 CCl 4 ) for cyclic voltammetry scanning, the scanning potential range is -0.2V~+1.0V, and the scanning speed is 50mV s -1 , the number of cycles is 3 cycles, and the range of the hydrogen zone is determined to be -0.2V to 0.05V; according to the determined range of the hydrogen zone, at 0.5mol dm -3 h 2 SO 4 solution, H 2 SO 4 solution with CCl 4 Mixed solution (0.5mol dm -3 h 2 SO 4 , 30 mg dm -3 CCl 4 ), respectively at -0.05V, -0.08V, -0.1V, -0.15...