Three-dimensional porous NiO/NF active material, preparation method and application thereof, and device for removing heavy metal ions in wastewater by electrocoagulation method

Abstract

The invention provides a three-dimensional porous NiO / NF active material as well as a preparation method and application thereof. The three-dimensional porous NiO / NF active material takes reticular porous foamed nickel NF as a structural framework, NiO nanosheets vertically grow on the surface of the foamed nickel NF, and no stack exists among the NiO nanosheets. The preparation method comprises the following steps: jointly adding foamed nickel subjected to acid treatment, nickel acetate, urea and ammonium fluoride into a reaction kettle, and carrying out sealed heating reaction to obtain Ni(OH)2 / NF; and subjecting the obtained Ni(OH)2 / NF to a high-temperature heating reaction in an oxygen atmosphere to obtain the NiO / NF active material. The NiO / NF active material can be used as an anode.On the basis, the invention further provides a device for removing heavy metal ions in wastewater through an electrocoagulation method. The wastewater discharged in the industry can be treated in a fixed-point interception mode, a water area polluted by the heavy metal ions can be treated in an intelligent robot treatment mode, and selective fixed-point treatment is achieved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a three-dimensional porous NiO / NF active material, a preparation method and application thereof, and a device for removing heavy metal ions in waste water by electrocoagulation. Background technique [0002] In recent years, due to the rapid development of industry, a large amount of industrial wastewater has been produced, especially in the electroplating and leather manufacturing industries, which have produced a large amount of industrial wastewater containing heavy metal ions. As a pollutant, heavy metal ions are extremely toxic and carcinogenic, and are harmful to almost all organs of the human body. In addition, heavy metal ions are not easy to degrade, and will transfer and accumulate in the food chain, and be ingested by humans. Therefore, the removal of heavy metal ions in industrial wastewater to meet the national discharge standards is the focus of...

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Problems solved by technology

The current removal method for removing heavy metal ions is the chemical precipitation method, which is precipitated and removed by adding a precipitant and adjusting the pH. However, this method requires external input of a precipitant or capture agent, which will generate a large amount of sludge. It is a one-time use product. The cost is high, and there is a risk of introducing secondary pollution; the adsorption method is also a common method, and the heavy metal ions in the wastewater are adsorbed and removed by the adsorbent. This method is environmentally friendly, but the environmental adaptation to the solution is weak. The removal time is long; the membrane separation method uses a selectively permeable membrane as the separation medium. When there is a certain driving force on both sides of the membrane, the components on the raw material side selectively permeate the membrane to achieve the purpose of separating and removing harmful components. This method is simple to operate and has a simple device, but it has high operating costs, low mechanical strength of the membrane, and short life; the catalytic reduction method uses electric energy or light energy to catalyze the degradation of heavy metal ions and reduce toxicity, but the current technology is immature and the efficiency is low

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