IONIC STRENGTH AND PH DEPENDENCE OF SORPTION OF PD ONTO ILLITE, BENTONITE, AND SHALE


41th Annual CNS-CNA Student Conference - 2017 June 05

Presented at:
41th Annual CNS-CNA Student Conference
2017 June 05
Location:
Niagara Falls, ON Canada
Session Title:
Student Posters, Wine-&-Cheese Reception

Authors:
A. Walker (McMaster University)
J. Goguen (McMaster University)
J. Riddoch (McMaster University)
S. Nagasaki (McMaster University)
  

Abstract

This paper examines sorption of palladium (Pd) onto illite, sodium-bentonite MX-80, and Queenston shale, under aerobic conditions, for Na-Ca-Cl solutions with I ranging from 0.1-6 mol/L (M) and pHc ranging from 3-9. Sorption decreased as I increased. At pH < 5 sorption increased, while for pH > 5 sorption was essentially constant. Surface complexation modelling (SCM) for sorption of Pd onto illite and montmorillonite was developed using PHREEQC and compared to the experimental results. The results showed some agreement to the experimental data, however, the general shapes did not match. SC constants were able to be optimized for 0.1 M.

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