摘要
通过使用含醋酸-磷酸配位体溶液与否进行了两种溶液的实验对微量金属Pb在A l2O3微粒上的结合进行了研究.根据溶液中的化学反应平衡常数的平衡计算,可以显示每种溶液中相应的pH值时会生成Pb的各种可溶性复合物和Pb的沉淀物.借助扫描电子显微镜(SEM)及其必要的辅助手段X线光谱微量分析技术在微观水平上很好地观察并区分重金属Pb在A l2O3微粒表面上是以复合物形式吸附还是以氢氧化物沉淀形式存在这一有趣现象.在电镜下,Pb的复合物[Pb(CH3COO)2]、[Pb(CH3COO)+]、[PbHPO4]和[PbH2PO4+]在A l2O3微粒表面上的吸附显示为许多界限不清的弥漫明亮区.而Pb在A l2O3微粒表面上所形成的PbO沉淀则显示为许多近似环形的界限清楚的明亮区.
Laboratory research of lead metal sorption on alumina particles was carried out in two experiments by using the solution with ligand of acetic-phosphoric or not. According to calculus of equilibrium constants of chemical reaction in solution, it can be demonstrated the formation of different soluble complexes and precipitation of lead which is conducted in every solution at appropriate pH values. An interesting phenomenon of adsorption or hydroxide precipitation of heavy metal lead complexes on alumina was well observed and distinguished by the scanning electron microscopy （SEM） technique combined with its necessary aided means X ray spectrometric analysis in the sight of microscopic level. From the observation by SEM, the adsorption of lead complexes [ Pb（CH3COO）2 ] 、 [ Pb （ CH3COO）^＋ ],、[ PbHPO4 ] and [ PbH2PO4^＋ ] on alumina particles can he demonstrated hy many bright diffuse zones without clear limits. But the lead precipitation PbO on alumina can be denlonstrated by many hright zones of approxinlate circles with clear limits.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2005年第8期1156-1158,共3页
Journal of Harbin Institute of Technology
关键词
PB
吸附
Al2O3微粒
电镜扫描
X线光谱
lead
sorption
alumina partieles
scanning electron microscopy
X ray spectrometric
