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Surface characteristics of shales and implication on metal sorption

Authors
  • Paikaray, Susanta1
  • Banerjee, Santanu1
  • Mukherji, Suparna2
  • 1 IIT Bombay, Department of Earth Sciences, Powai, Mumbai, 400 076, India , Powai, Mumbai (India)
  • 2 IIT Bombay, Center for Environmental Science and Engineering, Powai, Mumbai, 400 076, India , Powai, Mumbai (India)
Type
Published Article
Journal
Environmental Chemistry Letters
Publisher
Springer International Publishing
Publication Date
May 01, 2008
Volume
6
Issue
2
Pages
91–94
Identifiers
DOI: 10.1007/s10311-007-0113-2
Source
Springer Nature
Keywords
License
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Abstract

Differences in surface characteristics between alkaline and acidic shales are demonstrated in the present study. The alkaline shales are characterized by convex surface titration profiles, while the acidic shale exhibits a concave titration profile. Analysis of surface functional groups reveal that carboxylic acids predominate in alkaline shales and the acidic shale is characterized by C=S, C=N (pyridine derivative) and urea (C=O) functional groups, while it lacks –COOH group. The close proximity between pH and point of zero charge for the most acidic and alkaline shales indicate that surface complexation may not play a dominant role in sorption when the system pH is controlled by these sediments.

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