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| Copper and lead ion adsorption characteristics of modified corn stalk biochars |
| Received:December 06, 2019 |
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| KeyWord:adsorption;alkali modification;biochar;corn stalk;Cu2+;Pb2+;polyethyleneimine modification |
| Author Name | Affiliation | E-mail | | WANG Yi | School of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | | | LI Li | School of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Sustainable Use of Soil Resources in Jilin Province's Commodity Grain Base, Changchun 130118, China | 573803381@qq.com | | SONG Dou-dou | School of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | | | LIU Wei-ting | School of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | |
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| Abstract: |
| The aim of this study is to explore the heavy metal adsorption performance of modified biochars and provide a theoretical basis for the effective removal of copper and lead ions by different modified biochars. At 500℃, corn straw as the raw material was pyrolyzed in an oxygen-limited environment to produce biochar(BC). BC was modified with KOH and polyethyleneimine(PEI)to obtain alkali-modified biochar(KBC)and PEI-modified biochar(PBC). The single-solute adsorption of these biochars for Cu2+ and Pb2+ and the competitive adsorption of Cu2+ and Pb2+ were investigated. The adsorption kinetics of Cu2+ and Pb2+ by the three biochars fit the quasi-second-order kinetic equation well. The adsorption rates of the modified biochars were higher than those of the original BC. All the adsorption isotherms conformed to the Langmuir model and the maximum adsorption capacity followed the order of PBC > KBC > BC. The adsorption capacity and adsorption parameter of the three biochars were in the order of Pb2+ >Cu2+. Competitive adsorption experiments indicated that the competitive adsorption capacity of Pb2+ on the three biochars was higher than that of Cu2+. The adsorption ability of KBC and PBC for Cu2+ and Pb2+ was greater than that of BC, which demonstrates that KBC and PBC have the potential to become new adsorbents for heavy metals. |
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