改性花生壳生物质炭对土壤中Cr(Ⅵ)的吸附机制OA

In order to improve the removal rate of heavy metal Cr(Ⅵ)in soil,the use of simple and efficient adsorption methods to screen cheap and effective adsorbents has become a research hotspot for heavy metal removal in soil.This study uses agricultural waste peanut shells as raw materials and modifies them with FeCl3 and ZnCl2 to obtain the biochar from the modified peanut shell(MPS),which is used in experiments on the adsorption of heavy metal Cr(Ⅵ)in soil.The effects of pH value,dosage,reaction tem-perature,initial concentration,and reaction time on Cr(Ⅵ)removal rate were investigated,and the adsorption mechanism was ex-plored.The results showed that at a pH of 3,the addition of MPS was 5％of the soil mass,the reaction temperature was 30 ℃,the initial concentration was 120 mg·L-1,and the reaction time was 120 minutes.The highest removal rate obtained was 98.23％.The parameter fitting results indicate that the correlation coefficient R2 of the Langmuir adsorption model for modified peanut shell biochar is as high as 0.993,and the correlation coefficient R2 of the quasi second-order kinetic fitting is 0.987,indicating a single-molecule layer reaction.