Method for efficiently adsorbing arsenic in underground water by using nano iron oxide

Abstract

The invention discloses a method for efficiently adsorbing arsenic in underground water by using nano iron oxide. The method comprises the following steps of preparation of a mesoporous structure, preparation of the nano iron oxide with a particle diameter of less than 10 nanometers, formation of a resin-based nano iron oxide composite material, precipitation treatment, shaking treatment, adsorption wall adsorption purification, mixed centrifugal treatment and cleaning of the resin-based nano iron oxide composite material. The method for efficiently adsorbing the arsenic in the underground water by using the nano iron oxide has the advantages that the mesoporous structure prepared by adopting a rapid freezing method and the nano iron oxide prepared from powdery ferric trichloride can ensure the effect that the particle diameter of the nano iron oxide is less than 10 nanometers, the resin-based nano iron oxide composite material with the nano iron oxide with small particle diameter hashigh adsorption capacity for arsenic, thereby being capable of improving the purification function for the arsenic in the underground water as an adsorption wall, so that while the drinking safety isensured, economic popularization can also be achieved, and the method is suitable for water improvement in areas with quality-induced water shortage in northwest China, and has the advantages of highefficiency and low cost.

Description

technical field [0001] The invention relates to the field of groundwater purification, in particular to a method for efficiently adsorbing arsenic in groundwater by using nanometer iron oxide. Background technique [0002] Groundwater refers to the water that exists in the rock voids below the ground. In a narrow sense, it refers to the water in the saturated aquifer below the groundwater surface. Groundwater is an important part of water resources. Due to its stable water quantity and good water quality, it is an important resource for agricultural irrigation, industrial mining and One of the important water sources of the city. Arsenic is a metalloid element, and many compounds of arsenic contain fatal toxicity. In some cities in Xinjiang, Inner Mongolia, Shaanxi, Guizhou, Jilin, Ningxia, Qinghai and other provinces in my country, there are varying degrees of excessive arsenic in groundwater. Purify groundwater Arsenic in shows to be particularly important. [0003] At pr...

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Problems solved by technology

[0003] At present, the methods for purifying arsenic in groundwater include ion exchange, reverse osmosis, coagulation precipitation and adsorption, but ion exchange has the disadvantage of low purification efficiency, and the cost of reverse osmosis is high, which is not conducive to long-term maintenance. With the development of purification demand, although the method of coagulation sedimentation is simple and easy to implement, it is difficult to evolve the arsenic content in groundwater to the discharge standard, and will produce a large amount of arsenic-containing waste residue, which will cause secondary pollution to the environment. Adsorption method is very important in the treatment of groundwater. When containing arsenic, it has the advantages of high purification efficiency and low pollution, but it also has the problems of long purification time period and high purification cost. The long-term cumulative cost of arsenic removal materials is often high, so it is not particularly suitable for in-situ experiments.