Singh Alpana, Kumar Dhananjay, Gaur J P
Laboratory of Algal Biology, Department of Botany, Banaras Hindu University, Varanasi 221005, India.
J Hazard Mater. 2008 Apr 15;152(3):1011-9. doi: 10.1016/j.jhazmat.2007.07.076. Epub 2007 Jul 28.
Maximum sorption of Cu(II) and Pb(II) by dried filamentous green alga Pithophora oedogonia occurred at pH 4.5 and 5.0, respectively. Chemical pretreatment could not appreciably enhance the metal sorption ability of the biomass. HCl and EDTA desorbed 92-96% of the sorbed metal from the metal-loaded biomass. Sorption and desorption of both the test metals were very rapid attaining an equilibrium within 15 min. The time course data of both the processes fitted well to the pseudo-first and the pseudo-second-order Lagergren kinetic models with r2> or =0.979. The isotherm equilibrium of Cu(II) and Pb(II) followed the Redlich-Peterson and Sips model very well with r2> or =0.991. The sorption of Cu(II) and Pb(II) at varying biomass doses could be well defined by linear and hyperbolic decrease, respectively. The regenerated biomass of Pithophora has better reusability for Pb(II) than for Cu(II). A good mechanical strength of Pithophora biomass was apparent as only 10-15% loss of biomass occurred at the end of the fifth cycle.
干燥的丝状绿藻鞘藻对铜（II）和铅（II）的最大吸附分别发生在pH值为4.5和5.0时。化学预处理并不能显著提高该生物质的金属吸附能力。盐酸和乙二胺四乙酸从负载金属的生物质中解吸出92% - 96%的吸附金属。两种测试金属的吸附和解吸都非常迅速，在15分钟内达到平衡。这两个过程的时间进程数据与拟一级和拟二级Lagergren动力学模型拟合良好，相关系数r²≥0.979。铜（II）和铅（II）的等温线平衡与Redlich - Peterson模型和Sips模型拟合得非常好，相关系数r²≥0.991。不同生物质剂量下铜（II）和铅（II）的吸附分别可以用线性和双曲线下降很好地描述。鞘藻的再生生物质对铅（II）的再利用性比对铜（II）的更好。鞘藻生物质具有良好的机械强度，在第五个循环结束时，生物质仅损失10% - 15%。
