Biochar-loaded iron material for oxidizing and repairing organic pollution of soil water body as well as preparation method and application of biochar-loaded iron material

Abstract

The invention provides a preparation method of a biochar-loaded iron material for oxidizing and repairing organic pollution of soil water, which comprises the following steps: preparing a magnetic biochar compound, namely suspending and dispersing biochar powder in a soluble ferric salt solution, adding alkali liquor under a stirring condition, conducting reacting to generate precipitate until the pH value of a final mixed solution is 11-12, and sequentially separating, washing and drying the precipitate to obtain the magnetic biochar compound. According to the preparation method, the Fe3O4 is precipitated on the biochar while the Fe3O4 is generated, so that the time required for preparing the material is shortened, the steps are simpler, and the prepared biochar loaded iron material can quickly and efficiently catalyze and degrade polycyclic aromatic hydrocarbon. According to the soil water body remediation method, PAHs are catalyzed and oxidized by adopting a biochar-loaded iron material activated hydrogen peroxide oxidizing agent, an efficient site soil pollution remediation system is established, and it is found through experiments that the purpose of efficiently remediating polycyclic aromatic hydrocarbon soil pollution can be achieved.

Description

technical field [0001] The invention belongs to the technical field of soil environmental pollution control, and relates to a biochar-loaded iron material for oxidizing and repairing organic pollution of soil and water bodies, a preparation method and an application thereof. Background technique [0002] With the acceleration of urbanization and the adjustment of industrial structure, the polluted sites left by the relocation of urban industrial enterprises have become a new environmental problem that restricts the reuse of land resources in our country. In order to maintain people's health and safety, it is necessary to repair industrial polluted sites . The concentration of pollutants in my country's polluted sites is high, especially polycyclic aromatic hydrocarbons. These compounds seriously endanger the safety of humans and ecosystems due to their "three causes" characteristics, and because of their low solubility, refractory degradation, and easy adsorption on soil, be...

AI Technical Summary

Problems solved by technology

However, there are some problems in the advanced oxidation repair technology: (1) Non-targeted consumption of oxidizing agents, that is, there are abundant natural organic matter or other reactive substances in nature, especially in the soil environment, which are easily oxidized preferentially, resulting in the use of oxidizing agents The efficiency is low; (2) the surface of zero-valent iron materials will be passivated during the catalytic process, which will reduce the reaction rate. How to improve the utilization rate of iron has become one of the main trends of current research; The migration distance in the medium is also short, which greatly limits its application in soil pollution control; (4) soil particles have a strong binding ability to organic pollutants, resulting in the target pollutants being locked and the reactivity reduced. The problem is especially acute for historical pollutants

Images