Modified charcoal for adsorbing phosphorus in water body as well as preparation method and application thereof

Abstract

The invention discloses modified biochar for adsorbing phosphorus in a water body as well as a preparation method and application of the modified biochar. The preparation method of the modified biochar comprises the following steps: carrying out acid treatment and alkali treatment on biochar; and placing the biochar in a modifying solution and performing ultrasonic oscillation. The modified biochar prepared by the preparation method disclosed by the invention has the advantages of high metal ion loading capacity, good adsorption performance and the like; the modified biochar can be widely usedfor adsorbing pollutants (such as phosphorus and lead) in the environment, efficient adsorption of the pollutants (such as phosphorus and lead) in water can be achieved, the modified biochar can be continuously used for adsorbing the pollutants after being simply activated, and the high use value and application prospects are achieved. Meanwhile, the preparation method disclosed by the inventionalso has the advantages of simple process, convenience in operation, easily available raw materials, low cost and the like, can realize large-scale preparation, is suitable for industrial production,and is beneficial to popularization and application of the modified charcoal.

Description

technical field [0001] The invention belongs to the field of water body purification, and relates to a modified biochar for absorbing phosphorus in water bodies, a preparation method and application thereof. Background technique [0002] With the rapid development of my country's economy, the problem of eutrophication of surface water bodies such as rivers, lakes and reservoirs is becoming more and more serious. The main nutrient elements that cause eutrophication of water bodies are nitrogen and phosphorus, so the key to controlling eutrophication of water bodies is to control nitrogen and phosphorus. Commonly used nitrogen and phosphorus removal methods include biological methods, chemical methods and adsorption methods. The removal efficiency of biological method is low, the mechanism is complicated, and the process is not easy to control; although the removal rate of chemical method is high, it needs to add chemical reagents, which is costly and may cause secondary poll...

AI Technical Summary

Problems solved by technology

Biochar has good adsorption efficiency for various pollutants, but the adsorption efficiency for phosphorus needs to be further improved

At the same time, in order to improve the adsorption efficiency of biochar to phosphorus, the new technology currently used is high-temperature pyrolysis after adding aluminum or iron salts to the raw materials of biochar. Although this technology improves the adsorption efficiency of biochar to a certain extent (especially is the adsorption efficiency of phosphorus), but the microporous structure of the biomass material before carbonization is limited, and the ability to support metal ions is not strong; at the same time, in order to improve the adsorption capacity of biochar, acid or alkali activation is generally performed, and the existing technology prepares After the biochar is activated by acid or alkali, some of the loaded metal ions will undergo reactions such as replacement, precipitation, and desorption to separate from the biochar, thereby reducing the metal ion loading and adsorption efficiency.