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环境化学  2015 

水稻秸秆生物炭对Pb(Ⅱ)的吸附特性

Keywords: 水稻秸秆,生物炭,热解温度,吸附,Pb(Ⅱ)

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Abstract:

利用红外(FTIR)光谱、Boehm滴定、比表面积及微孔分析等方法对300℃、400℃、500℃、600℃下制备的水稻秸秆生物炭进行表征,分别记录为RC300、RC400、RC500和RC600,同时研究了4种生物炭在不同平衡时间、pH值、浓度下对Pb(Ⅱ)的吸附特征.结果表明,随着热解温度的升高,生物炭表面含氧官能团的数目下降,芳香化程度升高,微孔结构逐渐发育,比表面积逐渐增大.4种生物炭对Pb(Ⅱ)的吸附反应过程满足准二级动力学方程,相关系数R2大于0.9947.随着溶液初始pH值的升高,生物炭的吸附量增加,最佳吸附pH值RC300和RC400为3.5,RC500和RC600分别为6.5和6.0.在25℃时,4种生物炭对Pb(Ⅱ)的吸附容量为RC300>RC400>RC500>RC600,表明在300-600℃范围内,低温条件下制备的生物炭对重金属离子有更强的吸附能力.利用Langmuir方程和Freundlich方程拟合了4种生物炭对Pb(Ⅱ)的等温吸附数据,结果显示RC300和RC400符合Langmuir方程,而RC500和RC600更符合Freundlich方程.

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