Polycation-exchanged clays as sorbents for organic pollutants: Influence of layer charge on pollutant sorption capacity

BREEN, C. and WATSON, R. (1998). Polycation-exchanged clays as sorbents for organic pollutants: Influence of layer charge on pollutant sorption capacity. Journal of Colloid and Interface Science, 208 (2), 422-429.

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Link to published version:: 10.1006/jcis.1998.5804

Abstract

The uptake curves for the adsorption of a polycation ([CH2CH(OH)CH2N(CH3)(2)](n)(n+)(Cl)(n)(n-)) onto a low iron Texas bentonite, WL, have been determined and compared with those onto two source smectites, Swy-1 and SAz-1. The polycation exhibited a marked affinity for all the smectite surfaces but polycation uptake was maximized on the fine fractions of Na+-WL. Variable temperature X-ray diffraction of the clay polycation complexes showed that the polycation was segregated into different interlayers at loadings below 30% of the CEC. The adsorption of benzene onto TMA(+)-exchanged SWy-1, SAz-1, and WL showed that, despite having a comparable layer charge to SWy-1, WL was as poor a sorbent for benzene as SAz-1, which has a much higher layer charge. The adsorption of p-nitrophenol (PNP) from aqueous solution onto the TMA(+)-exchanged sorbents exhibited the same trends, although a smaller amount was adsorbed due to the greater size of PNP. The amount of PNP adsorbed by polycation-treated SWy-1 depended upon the polycation loading, and PNP uptake maximized at loadings of 28 and 46 mg (g clay)(-1). At higher loadings (80, 102, and 147 mg (g clay)(-1)) the uptake curves became linear and the PNP uptake decreased with increased polycation loading. No polycation-treated clay was as effective as TMA(+)-exchanged SWy-1 for the removal of PNP from water. (C) 1998 Academic Press.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Polymers Nanocomposites and Modelling Research Centre > Polymers, Composites and Spectroscopy Group
Identification Number: 10.1006/jcis.1998.5804
Depositing User: Jill Hazard
Date Deposited: 13 May 2010 09:45
Last Modified: 28 Sep 2010 17:12
URI: http://shura.shu.ac.uk/id/eprint/1856

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