Differences in adsorption mechanisms of heavy metal by two different plant biomasses: reed and brown seaweed.
Differences in adsorption mechanisms of heavy metal by two different plant biomasses: reed and brown seaweed.
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DOI：
10.2166/wst.2009.867
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
B. Southichak;K. Nakano;M. Nomura;N. Chiba;O. Nishimura
中科院分区：
文献类型：
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作者：
B. Southichak;K. Nakano;M. Nomura;N. Chiba;O. Nishimura
比较了芦苇和经CaCl2处理过的褐藻(马尾藻)两种不同生物材料对铅(II)的吸附性能，试图解释这两种生物材料吸附性能的差异。棕色海藻对铅的吸附容量(Q(Max)=0.45 mm o l/g)远高于芦苇(q(Max)=0.05 mm o l/g)，但其吸附亲和力(b=112 L/m ol)远低于芦苇(b=471 L/m o l)。比较了两种生物吸附材料的元素组成、离子交换现象和官能团的作用，以阐明其作用机理。棕色海藻对铅(II)的吸附能力较高，可能是由于其表面总官能团和钙含量丰富所致。相反，芦苇的功能复杂性、较高的Zeta电位和pK(A)值(去质子态)被认为是导致其高吸附亲和力的原因。
The adsorption of Pb(II) by two different biomaterials, reed (Phragmites australis) and brown seaweed (Sargassum horneri) biomass pretreated with CaCl(2), were compared in an attempt to explain the differences in adsorption performance between the two biosorbents. A very interesting characteristic was found in their individual adsorption performances; the Pb(II) adsorption capacity of brown seaweed (Q(max)=0.45 mmol/g) was much higher than that of reed (Q(max)=0.05 mmol/g), but its adsorption affinity (b=112 L/mmol) was much lower compared with that of reed (b=471 L/mmol). To elucidate the mechanism, the elemental components, ion exchange phenomenon and roles of functional groups of these two biosorbents were compared. The higher Pb(II) adsorption by brown seaweed could be due to its richness in total functional groups and calcium contents on its surface. In contrast, the functional complexity, higher zeta potential and pK(a) value (deprotonation state) of reed are believed to lead to its high adsorption affinity.