| 汪怡,李莉,宋豆豆,刘伟婷.玉米秸秆改性生物炭对铜、铅离子的吸附特性[J].农业环境科学学报,2020,39(6):1303-1313. |
| 玉米秸秆改性生物炭对铜、铅离子的吸附特性 |
| Copper and lead ion adsorption characteristics of modified corn stalk biochars |
| 投稿时间：2019-12-06 |
| DOI：10.11654/jaes.2019-1343 |
| 中文关键词: 吸附 碱改性 生物炭 玉米秸秆 Cu2+ Pb2+ 聚乙烯亚胺改性 |
| 英文关键词: adsorption alkali modification biochar corn stalk Cu2+ Pb2+ polyethyleneimine modification |
| 基金项目:国家自然科学基金项目（401877136）；国家重点研发计划项目（2017YFD0801104） |
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| 中文摘要: |
| 探究改性生物炭对重金属的吸附性能，为不同改性生物炭对铜、铅离子的有效去除提供理论依据。以玉米秸秆为原料，经500℃限氧热解制备生物炭（BC），再分别经KOH和聚乙烯亚胺（PEI）改性得到碱改性生物炭（KBC）和PEI改性生物炭（PBC），探讨3种生物炭对Cu2+和Pb2+的单一吸附效果及对复合体系中Cu2+和Pb2+的竞争吸附。3种生物炭对Cu2+、Pb2+的吸附动力学均符合准二级动力学方程，改性后生物炭的吸附速率均高于BC；吸附等温线均符合Langmuir模型，最大吸附量表现为：PBC > KBC > BC。3种生物炭的饱和吸附量和吸附容量遵循Pb2+>Cu2+；通过竞争吸附试验发现，Pb2+在3种生物炭上的竞争吸附能力均高于Cu2+。结果表明：KBC和PBC对Cu2+、Pb2+的吸附能力明显优于BC，有成为新型重金属吸附剂的潜力。 |
| 英文摘要: |
| 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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