2.2.2. Zeta-potentialThe mobilities

2.2.2. Zeta-potential
The mobilities (converted to zeta potentials by Smoluchowski equation) of the zeolite and zeolite composites were measured in distilled water (pH ffi 6.5) using a Zetasizer Nanosystem (Malvern Instruments, Southborough, MA). The samples were let to settle for a couple minutes and only the top of the suspension was sam- pled. The mobilities of zeolite and zeolite composites were mea- sured in a dilute suspension (