PREPARATION, CHARACTERIZATION AND APPLICATION OF HYBRID POLYMER IN DYE WASTEWATER TREATMENT
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Date
2014-09
Authors
LEE, YEAP KIEW
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Abstract
Inorganic-organic hybrid polymers, polyaluminium chloride-poly(3-
acrylamido-isopropanol chloride) (PACl-PAMIPCl) were prepared, characterized
and applied for Reactive Cibacron Blue F3GA (RCB), Disperse Terasil Yellow W-
4G (DTY) and industrial textile wastewaters treatment. The PAMIPCl copolymers
were prepared by varying the molar ratio of epichlorohydrin (EPI) to acrylamide
(AM). The maximum yield of PAMIPCl was 98.12% with the highest viscosity of
23.65 cP when EPI to AM molar ratio attained 4% : 96%. PACl-PAMIPCl hybrid
polymers were prepared with PAMIPCl and PACl through physical blending.
Scanning electron microscopy (SEM) was performed to clarify the microstructure of
the hybrid polymer in aqueous and solid forms, correspondingly. 90% PACl : 10%
PAMIPCl was the best ratios in treating synthetic dye wastewaters: 95.00 and
100.00% of color removal for RCB and DTY dyes, respectively. Zeta potential
study concluded that charge neutralization and adsorption-bridging dominated in the
flocculation mechanism of RCB and DTY dye, respectively. The surface
morphology of dried sludge formed using PACl-PAMIPCl hybrid polymer for RCB
and DTY dye wastewaters were relatively compact, well aggregated and smooth
compared to that of PACl. Response surface methodology (RSM) was applied to
investigate the independent factors which affecting color removal and COD
reduction of RCB and DTY dye wastewaters. The independent factors such as initial
dye concentration, initial pH, dosage, agitation speed and agitation time were
studied through 25-1 fractional factorial design and face-centered central composite
xxix
design (FCCD). All the independent factors were found to be statistically significant
in affecting color removal and COD reduction. The second-order model adequately
represented the experimental data of responses. The optimum operating conditions
to treat RCB dye wastewater are shown as follows: initial dye concentration of 170
mg/L, initial pH of 6.07, dosage of 30.00 mg/L, agitation speed of 100 rpm and
agitation time of 15 min. The predicted optimum color removal and COD reduction
are 98.85 and 66.00%, respectively. The optimum operating conditions to treat DTY
dye wastewater are shown as follows: initial dye concentration of 300 mg/L, initial
pH of 4.00, dosage of 30.00 mg/L, agitation speed of 300 rpm and agitation time of
3 min. The predicted optimum color removal and COD reduction are 100.00 and
85.47%, respectively. Finally, industrial textile wastewater attained 83.43% of color
removal and 79.17% of COD reduction with optimum conditions of 24.60 mg/L
hybrid polymer, pH 6.88, 300 rpm of agitation speed and 14 min of agitation time.
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PREPARATION, CHARACTERIZATION AND APPLICATION