A preparation method of nano-iron-carbon micro-electrolytic material for removing nitrate nitrogen

Abstract

The invention discloses a preparation method of a nitrate nitrogen-removed nano-iron-carbon micro-electrolysis material and belongs to the field of underground water pollutant restoration. The preparation method of the material comprises the following steps: dissolving ferric trichloride in an alcohol-water solution with the ratio of 3:7, continuously stirring, adding a sodium borohydride solution drop by drop, adding active carbon and polyethylene glycol, blowing nitrogen during the whole process, and stirring for 30 min so as to obtain nano-iron-carbon micro-electrolysis particles. The preparation method is simple to operate; raw materials are easily available; the material prepared from the surfactant polyethylene glycol has uniform particle size distribution and good dispersibility; and by combining strong reducing property of nano-iron and high adsorptivity of active carbon, nitrate nitrogen is 100 percent removed. By preparation of the novel nano-iron-carbon micro-electrolysis material, high-efficiency removal of nitrate nitrogen in underground water is realized by a nano-iron-carbon micro-electrolysis technology, and a new technical route and method is provided for effective removal of nitrate pollutants in underground water.

Description

technical field [0001] The invention belongs to the field of groundwater pollution restoration, and in particular relates to the development and innovation of sewage treatment materials in environmental protection. Background technique [0002] Iron-carbon micro-electrolysis means that when iron filings and carbon particles are immersed in acidic wastewater, countless micro-primary batteries will be formed in the wastewater due to the electrode potential difference between iron and carbon. These tiny batteries use iron with a low potential as the anode and carbon with a high potential as the cathode, and an electrochemical reaction occurs in an aqueous solution containing an acidic electrolyte. In the reaction, the nascent Fe 2+ And atomic H, they have high chemical activity, can change the structure and characteristics of many organic substances in wastewater, and cause organic substances to break chains and open rings. As a result of the reaction, the iron is corroded in...

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Problems solved by technology

[0003] At present, the micro-electrolysis equipment at home and abroad are all fixed beds, which are characterized by simple structure and good push-flow performance, but there are many practical problems: first, the efficiency is not high and the reaction speed is not fast; second, the bed body is easy to harden, causing short circuits and dead zone

After a period of operation of the iron bed, a passivation film will be formed on the surface of the filler, and the suspended particles in the wastewater will also be partially deposited on the surface of the filler, which will block the effective contact between the filler and the wastewater, resulting in a reduction in the treatment effect of the iron bed

The hardening of the iron bed filler will not only lead to the deterioration of the wastewater flow state inside the iron bed and reduce the treatment effect, but also greatly increase the difficulty of filler replacement

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