mg/Fe oxide modified biochar nanocomposite material and preparation method thereof

Abstract

The invention discloses a biochar nanocomposite material modified by Mg / Fe oxide and a preparation method thereof. The biochar nanocomposite material modified by Mg / Fe oxide uses biochar as a matrix, and Mg / Fe is oxidized on the surface of biochar. things. The preparation method is as follows: pulverize agricultural and forestry wastes and suspend them in water to obtain suspension A; add Mg 2+ and Fe 3+ , stirring and dispersing to obtain a suspension B; performing aging and co-precipitating to obtain a biomass iron-magnesium modified composite; performing pyrolysis under an inert atmosphere. The biochar nano-composite material modified by Mg / Fe oxide in the present invention has the advantages of low price and high efficiency, large-scale production, strong adsorption capacity, rapid solid-liquid separation, and environmental friendliness, and is applied to the degradation of activated persulfate The antibiotic pollution in the water body has good removal effect and fast reaction speed.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a Mg / Fe oxide-modified biochar nanocomposite material and a preparation method thereof. Background technique [0002] With the rapid development of the economy and the continuous adjustment of the industrial structure, the livestock and poultry breeding industry is increasingly developing in the direction of intensification and scale. In order to prevent and treat bacterial diseases and promote animal growth, antibiotics are widely used in agricultural production activities such as livestock and poultry farming and aquaculture. A large number of antibiotic pollutants are discharged into water bodies. These pollutants are large in quantity and slow in biodegradation rate. The continuous enrichment in the actual water body has caused chronic poisoning of microorganisms, algae, invertebrates, fish and amphibians in the water body and sediment, resulting in serious organic pollutio...

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Problems solved by technology

At the present stage, the sulfate radical advanced oxidation method still has some shortcomings in the application of water treatment: some methods have extreme reaction conditions, consume a lot of energy and chemical substances, and have secondary pollution risks, so they cannot be put into large-scale water treatment

However, the original biochar has the following problems in the actual use process: first, the reaction rate is slow, and it takes a long time for the reaction to achieve the adsorption equilibrium and high adsorption effect of the antibiotic, so it cannot remove the water body effectively in time. Antibiotic contamination in

Second, the specific surface area, pore volume and pore size of the original biochar are relatively small, the antibiotic removal efficiency is not high, and the pore characteristics and functionality are insufficient compared with conventional carbon materials (such as activated carbon, carbon nanotubes, graphene, etc.); Third, the special function of biochar is closely related to its pore structure, specific surface area, surface active functional groups, ash content, aromatization degree and other characteristics, and these characteristics are greatly affected by factors such as raw materials for biochar preparation, preparation process and pyrolysis conditions. Large, unmodified or functionally modified biochar has limited adsorption sites and active sites, which limits its application in actual wastewater treatment; Fourth, after the original biochar has completed the adsorption of antibiotics in water, it has no Separation characteristics, unable to achieve rapid solid-liquid separation in water, with the risk of causing secondary pollution

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