REMOVAL OF CR6+ IONS FROM WASTEWATER IN PRESENCE OF QUATERNARY AMMONIUM SALTS

REMOVAL OF CR6+ IONS FROM WASTEWATER IN PRESENCE
OF QUATERNARY AMMONIUM SALTS
DALIA M.S.A. SALEM* AND M.A.DRWEESH**
* National Institute of Oceanography and Fisheries. Kayet Bey, Alex, Egypt.
** Faculty of Engineering, Tanta University.
Keywords: Removal of Cr6+, wastewater, quaternary ammonium salts
ABSTRACT
The rate of reduction of Cr6+ to Cr3+ reaction in K2Cr2O7 has been studied and
it is found to be first order. The rate of reaction at 0.05 mole of K2Cr2O7 have been
measured in absence of quaternary ammonium salts as CTAB (Cetyl trimethyl
ammonium bromide) and CPYB (Cetyl trimethyl pyridinium bromide). The rates
of reaction are also measured in presence of CTAB and CPYB at four different
temperatures (25, 30, 35 and 40o
C). Effects of rotations are also studied. The rate
of reaction was decreased by addition of salts. Thermodynamic parameters ∆G*,
∆H* and ∆S* are given.