A device and method for synergistically degrading nitrate based on nanometer zero-valent iron conductive composite resin as catalyst

A nano-zero-valent iron and composite resin technology is applied in the field of water treatment, which can solve the problems of inconvenient engineering application and incomplete removal, and achieve the effect of high-efficiency electrocatalysis, high selectivity, and improved removal efficiency.

Active Publication Date: 2020-08-04
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Aiming at the defects of incomplete removal and inconvenient engineering application in the prior art for removing nitrate by electrolysis, only converting it into ammonia nitrogen, the present invention provides an anode and cathode based on a nanometer-loaded zero-valent iron conductive composite resin as a catalyst. A device and method for synergistically degrading nitrate, thus providing technical support for the deep purification of nitrate in water

Method used

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  • A device and method for synergistically degrading nitrate based on nanometer zero-valent iron conductive composite resin as catalyst
  • A device and method for synergistically degrading nitrate based on nanometer zero-valent iron conductive composite resin as catalyst
  • A device and method for synergistically degrading nitrate based on nanometer zero-valent iron conductive composite resin as catalyst

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Embodiment 1

[0044] This embodiment is a device based on a nanometer zero-valent iron conductive composite resin as a catalyst for the synergistic degradation of nitrate between the anode and cathode, such as figure 2 As shown, the device of the present invention is an electrochemical reaction device, including an anode 2, a water inlet pipe 3, a cathode 5, a nanometer-loaded zero-valent iron conductive composite resin 6 and an outlet pipe 7, the cathode 5 is a hollow cylinder, and the The conductive composite resin 6 loaded with nanometer zero-valent iron is evenly filled into the inner space of the cathode 5, and the cathode 5 and the conductive composite resin 6 loaded with nanometer zerovalent iron form a resin column; the anode 2 is inserted into the inner space of the resin column , the water inlet pipe 3 leads to the front end of the resin column, and the water outlet pipe 7 leads out from the rear end of the resin column.

[0045] The device also includes a resin column protection...

Embodiment 2

[0054] This example is an example of using a polystyrene-based resin as a carrier material to prepare a nano-sized zero-valent iron-loaded conductive composite resin for synergistic degradation of nitrate between the cathode and anode.

[0055] The device of the present embodiment is the same as in embodiment 1, and the method comprises the following steps:

[0056] (1) Using methyl acrylate as a monomer and divinylbenzene as a crosslinking agent, adding carbon nanotubes under the action of porogens, initiators and dispersants to obtain a conductive resin containing carboxyl groups; the carbon nanotubes Added to make the resin have conductive function.

[0057] (2) Mix the conductive resin containing carboxyl groups and sodium hydroxide solution in step (1) to react evenly, add the reacted resin to ferric chloride solution for reaction, and finally add sodium borohydride solution for ultrasonic reduction, and finally convert the nano The solid load of zero-valent iron is fixe...

Embodiment 3

[0066] This example is an example of using a polystyrene-based resin as a carrier material to prepare a nano-sized zero-valent iron-loaded conductive composite resin for synergistic degradation of nitrate between the cathode and anode.

[0067] The device of the present embodiment is the same as in embodiment 1, and the method comprises the following steps:

[0068] (1) First, synthesize a conductive composite resin loaded with nano-zero-valent iron. The mass of the resin prepared in this example is 0.5 g, the content of nano-zero-valent iron is 70 mg, and the particle size of the nano-zero-valent iron particles is 5-200 nm ; Pack the resin into a specific conductive resin column.

[0069] (2) With 100 mg / L NO 3 - The -N solution is the simulated pollutant, the electrolyte is 2 mol / L sodium chloride solution, and the water output from the resin column is controlled by a peristaltic pump at a speed of 0.15 mL / min.

[0070] (3) When the power is turned on, when the voltage is...

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Abstract

The invention belongs to the technical field of water treatment and discloses a device and a method for coordinating cathode and anode to degrade nitrate on the basis of taking zero-valent iron loadednanometer composite resin as a catalyst. The device comprises an anode, a water inlet pipe, a cathode, zero-valent iron loaded nanometer composite resin and a water outlet pipe; the cathode is a hollow cylinder body; the internal space of the cathode is filled with the zero-valent iron loaded nanometer composite resin uniformly; the cathode and the zero-valent iron loaded nanometer composite resin form a resin column; and the anode is inserted into the internal space of the resin column. The method comprises the following steps: a) synthesizing the zero-valent iron loaded nanometer compositeresin and filling the device with the resin; and b) pumping a nitrate solution taking chlorine salt as electrolyte into the device through the water inlet pipe, switching on the device, applying voltage to perform treatment, and guiding out the output water through the water outlet pipe after treatment. According to the method, the resin serves as a carrier, the zero-valent iron serves as the catalyst, the nitrated is converted into nitrogen under the coordination of the cathode and the anode to be discharged, and important value in the environmental pollution treatment is achieved.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a device and a method for synergistically degrading nitrate between an anode and an anode based on a conductive composite resin loaded with nanometer zero-valent iron as a catalyst. Background technique [0002] Nitrogen is an important element to maintain most life on earth. The nitrogen in water is mainly ionic nitrogen. Various forms of nitrogen undergo nitrogen cycle, and finally decompose and oxidize the product into nitrate. Nitrogen compounds in water have a high solubility, and when nitrogen compounds in water are supplemented externally, the content in water can increase without hindrance. With the expansion of population density and the development of industry and agriculture, more and more domestic garbage, urban sewage, industrial wastewater and the infiltration of chemical fertilizers and pesticides are discharged, which makes the pollution of gro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461
CPCC02F1/46104C02F1/46109C02F2001/46133C02F2001/46142C02F2101/163
Inventor 高冠道刘振威潘丙才丁杰蒲良桃王炎峰任志远喻安晴董上上
Owner NANJING UNIV
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