Characteristics of different types of nano-biochar and their effects on remediation of cadmium pollution in soil
[Objective]Biochar has a certain remediation effect on heavy metal contaminated soil,but the remediation potential of unmodified biochar is often low.Modifying biochar effectively enhances the diversity and abundance of functional groups on its surface,expanding the sites that interact with heavy metals and consequently enhancing heavy metal remediation efficiency.[Method]Three types of biochar,namely charcoal,bamboo charcoal,and straw charcoal,nano modification and characterization of these specimens was carried out through the use of scanning electron microscopy and Fourier transform infrared spectroscopy.A culture experiment was conducted,with a total of 7 treatments including no biochar control,three different types of biochar treatment,and three nano modified biochar treatments.[Result](1)Different types of biochar nano modified exhibit an increase in pores,an increase in pore size,and a decrease in particle size,Enhancing the functional group structure and strengthening oxygen-containing functional groups;(2)Nano biochar can increase soil pH,organic carbon(SOC),soluble organic carbon(DOC),easily oxidizable organic carbon(EOC),and particulate organic carbon(POC).Among them,nano bamboo charcoal increased SOC by 20.77%compared to unmodified bamboo charcoal treatment.Nano straw charcoal has the best effect on improving soil DOC,LOC,and POC,with an increase of 17.05%,10.88%,and 63.36%compared to unmodified straw charcoal,respectively;The addition of biochar also increased soil sucrase and cellulase activities.(3)The addition of biochar reduces the effectiveness of heavy metal cadmium in soil,and the modification enhances the transform of available cadmium in soil,promoting the transformation and migration of exchangeable and reducible cadmium to oxidizable and residual cadmium.Its effectiveness is related to soil pH and organic carbon.[Conclusion]After nano modification of biochar,its oxygen-containing functional groups increase,which has great potential in improving the effectiveness of soil organic carbon and 0degrading heavy metal cadmium.Different types of nano biochar have different effects on soil organic carbon and cadmium forms,and nano straw charcoal has the best effect.
nano biocharcharacterization of biocharsoil organic carboncadmium forms
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