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当前位置: 首页 > 文章 > 玉米秸秆改性生物炭对铜、铅离子的吸附特性 农业环境科学学报 2020 (6) 1303-1313
Position: Home > Articles > Copper and lead ion adsorption characteristics of modified corn stalk biochars Journal of Agro-Environment Science 2020 (6) 1303-1313

玉米秸秆改性生物炭对铜、铅离子的吸附特性

作  者：
汪怡;李莉;宋豆豆;刘伟婷
单  位：
关键词：
吸附;碱改性;生物炭;玉米秸秆;Cu2+;Pb2+;聚乙烯亚胺改性
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Cu~(2+)和Pb~(2+)的单一吸附效果及对复合体系中Cu~(2+)和Pb~(2+)的竞争吸附。3种生物炭对Cu~(2+)、Pb~(2+)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Pb~(2+)>Cu~(2+);通过竞争吸附试验发现,Pb~(2+)在3种生物炭上的竞争吸附能力均高于Cu~(2+)。结果表明:KBC和PBC对Cu~(2+)、Pb~(2+)的吸附能力明显优于BC,有成为新型重金属吸附剂的潜力。
译  名：
Copper and lead ion adsorption characteristics of modified corn stalk biochars
作  者：
WANG Yi;LI Li;SONG Dou-dou;LIU Wei-ting;School of Resources and Environment, Jilin Agricultural University;Key Laboratory of Sustainable Use of Soil Resources in Jilin Province′s Commodity Grain Base;
关键词：
adsorption;;alkali modification;;biochar;;corn stalk;;Cu2+;;Pb2+;;polyethyleneimine modification
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 Cu~(2+)and Pb~(2+)and the competitive adsorption of Cu~(2+)and Pb~(2+)were investigated. The adsorption kinetics of Cu~(2+)and Pb~(2+)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 Pb~(2+)>Cu~(2+). Competitive adsorption experiments indicated that the competitive adsorption capacity of Pb~(2+)on the three biochars was higher than that of Cu~(2+). The adsorption ability of KBC and PBC for Cu~(2+)and Pb~(2+)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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