Flow injection potentiometric stripping analysis for study of adsorption of heavy metal ions onto modified diatomite
Flow injection potentiometric stripping analysis for study of adsorption of heavy metal ions onto modified diatomite
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DOI：
10.1016/j.cej.2004.07.010
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发表时间：
2004-11-15
影响因子：
15.1
通讯作者：
Tutuji, M
中科院分区：
文献类型：
--
作者：
Al-Ghouti, MA;Khraisheh, MAM;Tutuji, M
采用计算机流动注射-电位溶出分析（FIPSA）技术研究了锰氧化物改性硅藻土对Pb（II）、Cd（II）和Zn（II）离子的吸附行为。信号优化进行相对于流速，沉积时间，沉积电位，氧化剂浓度，汞膜的厚度，溶液pH值和金属离子浓度。通过引入吸附微柱作为流动注射系统的补充部件，促进了柱吸附特性的检查。采用所得到的穿透曲线来计算参数，包括吸附容量和吸附速率常数，考虑到初始离子浓度，流速，吸附剂的质量和粒度，和柱内径。采用托马斯数学模型测定的吸附容量表明，锰改性的约旦沸石对水溶液中的重金属离子具有去除效率; Cd（II）> Zn（II）- Pb（II）。各离子的相对吸附速率顺序为：Pb（II）> Zn（II）- Cd（II）。(C)2004 Elsevier B. V.保留所有权利。
Computerised flow injection coupled with potentiometric stripping analysis (FlPSA) was employed for examination of the adsorption behaviour of Pb(II), Cd(II) and Zn(II) ions onto diatomite modified with manganese oxides. Signal optimisation was undertaken with respect to flow rate, deposition time, deposition potential, oxidising agent concentration, thickness of mercury film, solution pH and metal ion concentration. Examination of the column adsorption characteristics was facilitated by introduction of an adsorption microcolumn, as a complementary component of the flow injection system. The resulting breakthrough curves were employed to calculate parameters including adsorption capacity and adsorption rate constant, taking into consideration initial ion concentration, flow rate, mass and particle size of adsorbent, and column internal diameter. Adsorption capacities, determined using the Thomas mathematical model, showed that manganese modified Jordanian diatomite had an efficiency towards the removal of heavy metal ions from aqueous solutions; Cd(II) > Zn(ll) - Pb(II). The relative adsorption rates of the ions followed the order: Pb(ll) > Zn(ll) - Cd(ll). (C) 2004 Elsevier B.V. All rights reserved.