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Zeta potential on the anti-scalant modified sub-micro calcite surface
- Source :
-
Colloids & Surfaces A: Physicochemical & Engineering Aspects . Oct2008, Vol. 328 Issue 1-3, p60-66. 7p. - Publication Year :
- 2008
-
Abstract
- Abstract: With the view of increasing the understanding to the anti-scaling mechanism in the membrane process, zeta potential on the anti-scalant (Calgon and PAA) modified sub-micro calcite surface was measured and was further characterized with a molecular simulation. Experimental results show that the original positively charged calcite in an aqueous solution is reversed to be negatively charged by introducing anti-scalants at a dosage of ppm level. On the basis of theoretical calculation, the observed reversal is resulted from the statistically predominant orientation of negative potential-determining groups in the adsorbed anti-scalant molecules, i.e. Pe:glyph name="dbnd" />O, stretching against the calcite surface. A negative zeta potential prevailing on the calcite surface can effectively prevent the calcite from precipitating on the membrane surface. In the presence of anti-scalants, zeta potential on the sub-micro calcite surface is a sensitive function of calcite content, anti-scalant concentration, salt concentration, and pH of the suspension. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09277757
- Volume :
- 328
- Issue :
- 1-3
- Database :
- Academic Search Index
- Journal :
- Colloids & Surfaces A: Physicochemical & Engineering Aspects
- Publication Type :
- Academic Journal
- Accession number :
- 34089893
- Full Text :
- https://doi.org/10.1016/j.colsurfa.2008.06.025