Method for preparing nitrogen-doped activated carbon by using melamine waste

Abstract

The invention discloses a method for preparing nitrogen-doped activated carbon by using melamine waste OAT. The method comprises the following steps: adding activated carbon, or wood chips or carbonized wood chips into an ethanol-aqueous solution with the volume ratio of (0:10)-(10:0), then adding the melamine waste OAT, stirring for 1-8 hours, performing ultrasonic treatment for 10-60 min, performing oxygen-free heating at a high-temperature furnace with the temperature of 400-900 DEG C for 10-300 min, and then performing acidification and washing to obtain the nitrogen-doped activated carbon. According to the method, the characteristic that the melamine wastes OAT contains large amounts of nitrogen is utilized, and activated carbon doping process is performed at different process conditions, so that not only is industrial solid waste OAT treated, but also the polarity of the activated carbon is improved, and functional groups on the surface of the activated carbon are increased. The pollution treatment capacity of the activated carbon for heavy metal ions in gas and liquid as well as organic materials is greatly improved compared with ordinary activated carbon.

Description

Technical field [0001] The present invention is a chemical industry, which involves a method of preparing nitrogen doping carbon with melamine waste OAT. Background technique [0002] The production of melamine by urea high pressure method is a more common method in China.However, the waste produced by this method contains a large amount of mixture (referred to as OAT), which is difficult to recover melamine, melamine, melamine, and mekeelamate, and triocyanic acid.In recent years, due to the occurrence of poison milk powder incidents, people have paid more attention to the treatment of melamine waste.There is a separation and recycling of valuable ingredients, melamine and OAT are hotly interpreted as CO 2 And NH 3 After recycling, use melamine waste residue and cyanal uric acid as raw materials to prepare melamine oleulic acid salt, and use waste residue from melamine crystal parental liquid to make water -soluble thermal stabilized resin.The use of nitrogen fertilizers to achi...

AI Technical Summary

Problems solved by technology

However, the waste produced by this method contains a large amount of melamine, a mixture of ammeline and ammelide (OAT) that is difficult to recycle, and has only been landfilled for a long time.

In recent years, due to the occurrence of tainted milk powder incidents, people have paid more and more attention to the treatment of melamine waste. However, regarding the recycling of melamine waste OAT, the retrieved literature involves: the use of melamine waste to prepare cyanuric acid, solid waste Separation and recovery of valuable components, melamine and OAT are pyrolyzed into CO 2 and NH 3 Post-recycling, using melamine waste residue and cyanuric acid as raw materials to prepare melamine cyanurate, using the waste residue from melamine crystallization mother liquor to make water-soluble heat-stable resin, there are also studies using the high nitrogen content in waste. As a nitrogen fertilizer application to achieve resource reuse, but there is no report on the use of melamine waste OAT as a nitrogen source to prepare activated carbon