Zhou J L, Huang P L, Lin R G
School of Ocean Sciences, University of Wales, Bangor, Menai Bridge, Anglesey LL59 5EY, UK.
Environ Pollut. 1998;101(1):67-75. doi: 10.1016/s0269-7491(98)00034-7.
The sorption and desorption of Cu and Cd by two species of brown macroalgae and five species of microalgae were studied. The two brown macroalgae, Laminaria japonica and Sargassum kjellmanianum, were found to have high capacities at pHs between 4.0 and 5.0 while for microalgae, optimum pH lay at 6.7. The presence of other cations in solution was found to reduce the sorption of the target cation, suggesting a competition for sorption sites on organisms. Sorption isotherms obeyed the Freundlich equation, suggesting involvement of a multiplicity of mechanisms and sorption sites. For the microalgae tested, Spirulina platensis had the highest capacity for Cd, followed by Nannochloropsis oculata, Phaeodactylum tricornutum, Platymonas cordifolia and Chaetoceros minutissimus. The reversibility of metal sorption by macroalgae was examined and the results show that both HCl and EDTA solutions were very effective in desorbing sorbed metal ions from macroalgae, with up to 99.5% of metals being recovered. The regenerated biomass showed undiminished sorption performance for the two metals studied, suggesting the potential of such material for use in water and wastewater treatment.
研究了两种褐藻和五种微藻对铜和镉的吸附与解吸情况。发现两种褐藻，即海带和羊栖菜，在pH值为4.0至5.0之间具有较高的吸附能力，而对于微藻来说，最佳pH值为6.7。研究发现溶液中其他阳离子的存在会降低目标阳离子的吸附，这表明生物体上的吸附位点存在竞争。吸附等温线符合弗伦德利希方程，这表明存在多种机制和吸附位点。在所测试的微藻中，钝顶螺旋藻对镉的吸附能力最高，其次是眼点拟微绿球藻、三角褐指藻、心形扁藻和极小角毛藻。研究了大型海藻对金属吸附的可逆性，结果表明盐酸和乙二胺四乙酸（EDTA）溶液都能非常有效地从大型海藻中解吸吸附的金属离子，金属回收率高达99.5%。再生生物量对所研究的两种金属的吸附性能未降低，这表明这种材料在水和废水处理中的应用潜力。
