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Method for removing perchlorate from water body through electrochemical reduction

A perchlorate and electrochemical technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., to achieve the effect of improving mass transfer efficiency, increasing reduction speed, and simple synthesis method

Active Publication Date: 2017-09-15
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts carbon nanotubes as the base material, loads elemental tin as a catalyst to make a composite material, and uses it as a cathode material for electrochemical reduction treatment of perchlorate, and relevant research has not yet been reported.

Method used

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  • Method for removing perchlorate from water body through electrochemical reduction
  • Method for removing perchlorate from water body through electrochemical reduction
  • Method for removing perchlorate from water body through electrochemical reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 1 g of carbon nanotubes into a three-necked flask, add 500 mL of concentrated sulfuric acid, stir magnetically, reflux at 70° C. for 12 h, and cool naturally to room temperature. The acidified solution of carbon nanotubes was vacuum filtered with a PTFE filter membrane with a pore size of 5 μm, and rinsed with a large amount of distilled water until the pH of the filtrate was neutral, and the rinsed carbon nanotubes were dried in an oven at 60° C.

[0024] Weigh 15 mg of carbon nanotubes treated with nitric acid, add 30 mL of distilled water, and disperse by ultrasonic. After the carbon nanotube mixture was naturally cooled to room temperature, 50 mg of SnCl was added 2 2H 2 O, add distilled water to 100mL, magnetically stir for 1h, add 100mgNaBH 4 , continue magnetic stirring for 2h, then vacuum filter the mixture onto a PTFE membrane, wash with a large amount of distilled water, and prepare a Sn@CNTs membrane electrode.

[0025] Add 30 mL of dimethyl sulfoxid...

Embodiment 2

[0031] The equipment used in the experiment and the experimental process are the same as in Example 1. The set voltage is 3V, and the Sn@CNTs film electrode is used as the cathode. The synthesis method is as in Example 1. When synthesizing composite materials, the mass of carbon nanotubes is 15mg. The difference is that SnCl 2 2H 2 The quality of O is different.

[0032] (1) SnCl 2 2H 2 The mass of O is 20 mg synthetic Sn@CNTs membrane electrode, and the removal rate of perchlorate is 28% after running for one hour, which is equivalent to that of carbon nanotube membrane electrode.

[0033] (2) SnCl 2 2H 2 The quality of O is 50 mg synthesized Sn@CNTs membrane electrode, running for one hour, the removal rate of perchlorate is 70%, which is 133% higher than that of carbon nanotube electrode.

[0034] (3) SnCl 2 2H 2 The quality of O is 100mg synthesized Sn@CNTs membrane electrode, running for one hour, the removal rate of perchlorate is 45%, which is 50% higher than tha...

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Abstract

The invention relates to a method for removing perchlorate from a water body through electrochemical reduction. The method is basically characterized in that carbon nano-tubes are selected as a cathode substrate material, and are firstly subjected to nitric acid acidification, elemental tin as a catalyst is loaded on the obtained carbon nano-tubes by using a chemical reduction method to synthesize a composite material Sn@CNTs, a membrane electrode is prepared through vacuum suction filtration, the Sn@CNTs membrane electrode is arranged in a filtration type electrochemical reactor so as to be used as a cathode, a porous ruthenium plating plate is used as an anode, an external direct current power source is connected, perchlorate wastewater is pumped into the reactor by using a peristaltic pump, and the perchlorate electrons at the cathode are reduced into the chlorine ions so as to be removed. According to the present invention, the composite Sn@CNTs membrane electrode is adopted as the cathode, such that the perchlorate can be effectively removed through the electric reduction.

Description

technical field [0001] The invention belongs to the technical field of perchlorate treatment in water, and in particular relates to the preparation of carbon nanotube composite membrane electrodes Sn@CNTs, and is applied to a method for removing perchlorate in wastewater by electrochemical reduction. Background technique [0002] Perchlorate is a new kind of inorganic pollutant, which is widely used as an oxidizing agent in rocket propellants, explosives, pyrotechnics and other fields. Accompanied by large-scale industrial production, use and unrestrained direct discharge of human beings, a large amount of perchlorate has entered the water body. Due to the high water solubility and fast diffusion speed of perchlorate, it can migrate quickly in the environment, and it is difficult to degrade under natural conditions, thus causing a wide range of perchlorate pollution. [0003] Perchlorate dissolved in water will enter the human body through drinking and other channels, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F101/12
CPCC02F1/46109C02F1/4676C02F2001/46133C02F2101/12C02F2201/46115
Inventor 高冠道徐芳
Owner NANKAI UNIV
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