Lázaro Núria, Sevilla Asunción López, Morales Susana, Marqués Ana M
Departament de Microbiologia i Parasitologia Sanitàries, Facultat de Farmàcia, Universitat de Barcelona, Spain.
Water Res. 2003 May;37(9):2118-26. doi: 10.1016/S0043-1354(02)00575-4.
The Ni(2+) accumulation in batch mode from diluted solutions by gel beads of gellan gum (GG), alginate, kappa-carrageenan, agar, agarose, silica gel, polyacrylamide and two mixtures of GG+agar was investigated. All polymeric materials studied accumulated Ni(2+), but gel beads of GG were stable, easily obtainable and showed the highest Ni(2+) accumulation. The pH of the Ni(2+) solution was not critical for Ni(2+) accumulation. Accumulation of metals Cu(2+), Co(2+), Ni(2+), Pb(2+), Cd(2+) and Zn(2+) by GG gel beads reached the equilibrium after 24h. The removal of Pb(2+) and Cu(2+) from the aqueous solution was very efficient, with maximum metal uptake (q(max)) of 0.85 and 0.75 mmol/g dw GG, respectively. The general q(max) sequence was Pb>Cu>Ni approximately Zn=Co>Cd. In an equimolar metal mixture sorption experiment a clear reduction in accumulation was observed, except for Pb(2+) (30%). Heavy metals were desorbed with 100mM sodium citrate.
研究了结冷胶(GG)、海藻酸盐、κ-卡拉胶、琼脂、琼脂糖、硅胶、聚丙烯酰胺以及两种GG+琼脂混合物的凝胶珠在间歇模式下从稀释溶液中积累Ni(2+)的情况。所有研究的聚合材料都能积累Ni(2+),但GG凝胶珠稳定、易于获得且表现出最高的Ni(2+)积累量。Ni(2+)溶液的pH值对Ni(2+)积累并不关键。GG凝胶珠对金属Cu(2+)、Co(2+)、Ni(2+)、Pb(2+)、Cd(2+)和Zn(2+)的积累在24小时后达到平衡。从水溶液中去除Pb(2+)和Cu(2+)非常有效,最大金属吸附量(q(max))分别为0.85和0.75 mmol/g干重GG。一般的q(max)顺序为Pb>Cu>Ni≈Zn=Co>Cd。在等摩尔金属混合物吸附实验中,除了Pb(2+)(30%)外,观察到积累量明显降低。重金属用100mM柠檬酸钠解吸。