Modification of solid waste materials and repair test of heavy metals
In order to make rational use of waste resources and reduce the potential risks of heavy metals in soil,a corn straw biochar material is prepared with corn straw solid waste as raw material,and chitosan is used to study the properties of modified corn straw biochar material and its repair effect on heavy metals in soil.The test results show that(1)the pH value of modified biochar material is 8.39,electrical conductivity is 28.26µS·cm-1,specific surface area is 2.23m2·g-1,pore diameter is 8.75nm;(2)modified biochar material can increase soil alkalinity and conductivity,soil pH value is 7.83,soil conductivity is 2.25mS·cm-1;(3)modified biochar material has good effect on soil heavy metals in soil,and heavy metals lead and cadmium in soil.In conclusion,this chitosan-modified com straw biochar material has a good adsorption and passivation effect on the heavy metals lead and cadmium in the soil,and has a good repair effect.
biocharchitosanheavy metalsconductivitycarbonate bound state
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