Application of the hottest biochar and its composi

2022-08-24
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Research progress in the application of biochar and its composites in soil pollution remediation

Abstract

the accumulation of heavy metals and pesticide residues in soil has caused serious soil pollution and caused a series of ecological problems. Because of its unique surface structure, biochar and its composites can adsorb pollutants in soil through physical or chemical actions, limit the migration and transmission process of pollutants in the ecosystem, and then improve the physical and chemical properties of soil. Therefore, the application of biochar in soil pollution control has attracted more and more attention, but most of the research is limited to the laboratory level

this paper sorts out the relevant research on the application of biochar and its composites in natural soil environment in recent years, and expounds the action mechanism of different biochar materials on two kinds of pollutants in polluted soil from two aspects of heavy metals and organic pollutants; This paper introduces the modification and compounding methods of biochar and its application advantages, and prospects the research focus of biochar materials in the remediation of contaminated soil, such as rope and other plastic testing

composites can significantly enhance the adsorption performance of biochar for pollutants. From the perspective of adsorption mechanism, biochar and its composites are mainly electrostatic, ion exchange and surface functional groups; For organic pollutants, the main mechanisms are distribution, adsorption and pore filling, but in the process of practical application, these mechanisms often play a role together, but the degree of contribution is different. In addition, biochar and its composites can also indirectly enhance soil resistance to pollutants by improving soil quality. Although nano materials can enhance the performance of biochar, its toxicity mechanism to microorganisms in soil is not completely clear

in conclusion, the application of biochar and its composites in the natural soil environment can significantly reduce the toxicity of pollutants, but the mechanism of the new biochar composites needs further study. If installed on the floor, hollow floors should be avoided and demonstrated

conclusion and Outlook:

to sum up, the research on the application of biochar and its composites in soil pollution remediation is a hot spot at present. Relevant research mainly focuses on the fields of biomass material pollutant soil environmental system, soil heavy metal and organic pollution remediation and soil improvement, but mostly stays at the laboratory level, and the systematic summary of biochar and its composites on the remediation of pollution in the real soil environment is less, We should expand its adaptability research in relevant directions. With the increasingly severe situation of soil pollution prevention and the gradual deepening of research, the research on soil pollution remediation by biochar and its composites should be further improved and developed in the following aspects:

(1) we should focus on how to apply the biochar materials obtained in the laboratory to the natural soil environmental system, and pay attention to the stability of the materials in the application environment and the mobility of the composites, And consider the preparation cost and the potential risks of biomass and its composites

(2) carry out the environmental impact assessment of graduate projects; In March, 2017, in the process of repairing contaminated soil with carbon and its composites, greener modification methods and more environmentally friendly composites should be selected as much as possible. At the same time, its interaction with pollutants and its impact on various components of the environment should be explored. For example, nanocomposite biochar materials should be concerned about their toxicity to soil microbial communities

(3) the adsorption capacity of biochar and its composites is affected by many factors, and the research on its action mechanism is mostly qualitative analysis, rarely quantitative analysis. Therefore, how to quantitatively analyze the contribution rate of different action mechanisms can be one of the future research directions

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