Research Information System
2nd International Conference on Recycling and Reuse, İstanbul, Turkey, 4 - 06 June 2014, pp.233-234, (Full Text)
The industrial wastewater is one of the most important contaminants that cause environmental pollution. If the untreated industrial wastewaters are discharged in receiving body, it will generate toxic effects to the environment and living organisms. Removal of heavy metals, one of the most important pollutants in industrial wastewater, is extremely important, because of their persistence, unbiodegradability, accumulation potential and toxicity.
In this study, the removal of heavy metals (Cu(II), Ni(II), Zn(II) and total Cr) from real industrial wastewater (galvanotechnic industry) using polyacrylic acid (Aac) hydrogel was investigated. The effects of hydrogel dosage and contact time on heavy metal removal from real industrial wastewater, and adsorption isotherm, kinetics and scanning electron microscope (SEM) studies for adsorption of heavy metals were studied. The adsorption capacity, q (mg/g), of Aac hydrogel for Cu(II), Ni(II), Zn(II) and total Cr was 2.74, 1.91, 6.71 and 7.24 mg/g, respectively. The removal of heavy metals from industrial using Aac hydrogel was fitted with Freundlich isotherm, pseudo second-order kinetic models.
Table 2. Langmuir and Freunlich Isotherm parameters
|
Langmuir |
Freundlich |
|||||
|
Xm (mg/g) |
K (L/mg) |
Ra |
Kf (mg/g) |
n |
R |
|
|
Cu(II) |
1.410 |
0.069 |
0.966 |
0.018 |
0.440 |
0.981 |
|
Ni(II) |
5.850 |
0.054 |
0.882 |
0.543 |
0.660 |
0.945 |
|
Zn(II) |
14.310 |
43.48 |
0.865 |
0.210 |
0.820 |
0.989 |
|
Total Cr |
16.500 |
0.011 |
0.923 |
0.097 |
0.750 |
0.998 |
(a R : correlation coefficient)
|
(a) |
(b) |
Figure 2. Effect of contact time on (a) adsorption capacity, q (mg/g), for Aac hydrogel and (b) heavy metal removal (%) (pH=1.96, hydrogel dosage= 25 g/L, shaking speed= 150 rpm)
References
Anirudhan, T.S., Radhakrishnan, P.G., 2008. Thermodynamics and Kinetics of adsorption of Cu(II) from Aqueous solutions onto a New Cation Exchanger Derived from Tamarind Fruit Shell. Journal of Chemical Thermodynamics (Elsevier, The Netherlands) 40, 702-709.
Anirudhan, T.S., Suchithrs, P.S., 2010. Equilibrium, kinetic and thermodynamic modeling for the adsorption of heavy metals onto chemically modified hydrotalcite. Indian Journal of Chemical Technology, 17, 247-259.
Ankit M.P., Ranjan G.P., Manish P.P., 2011. Nickel and Copper Removal Study from Aqueous Solution Using New Cationic Poly[acrylamide/N,N-DAMB/N,N-DAPB] Super Absorbent Hydrogel. Journal ofApplied Polymer Science,Vol. 119, 2485–2493.
BALKAYA, N., CESUR, H., 2008. Adsorption of cadmium from aqueous solution by phosphogypsum. Chemical Engineering Journal 140, 247–254.
BARAKAT, M.A., 2011. New trends in removing heavy metals from industrial wastewater. Arabian Journal of Chemistry, 4, 361–377.