Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53236#.VLh228nQrzE Author(s)    Ponyadira Kabwadza-Corner 1* , Erni Johan 2 , Naoto Matsue 1   Affiliation(s) 1 Laboratory of Applied Chemistry for Environmental Industry, Faculty of Agriculture, Ehime University, Matsuyama, Japan . 2 Graduate School of Science and Engineering, Matsuyama, Japan . ABSTRACT The adsorption of Pb on zeolites A4, X, Y and mordenite was studied at various initial pH with the purpose of assessing the pH dependence of Pb adsorption. The adsorption was conducted using 0 - 0.6 mM PbNO 3 in the presence of 100 mM NH 4 NO 3 and pH adjustment done using HNO 3 . The coexisting NH 4 NO 3 served as a representative of other cations available in nature. The study was conducted at initial solution pH ranging from 3 - 5. Adsorption results were analyzed using Langmuir isotherm analysis. Adsorption was noted to be dependent on pH wi...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=48640#.VK3_j8nQrzE Author(s)    Moses Wazingwa Munthali , Ponyadira Kabwadza-Corner , Erni Johan , Naoto Matsue Affiliation(s) Laboratory of Applied Chemistry for Environmental Industry, Faculty of Agriculture, Ehime University, Matsuyama, Japan . Laboratory of Applied Chemistry for Environmental Industry, Faculty of Agriculture, Ehime University, Matsuyama, Japan . Laboratory of Applied Chemistry for Environmental Industry, Faculty of Agriculture, Ehime University, Matsuyama, Japan . Laboratory of Applied Chemistry for Environmental Industry, Faculty of Agriculture, Ehime University, Matsuyama, Japan . ABSTRACT Cation exchange capacity (CEC) is an important characteristic of zeolites, especially when they are used as adsorbents in the aqueous system. However, no international standard method exists for the determination of CEC of zeolites. We determined C...