Plastic waste as a valuable resource: strategy to remove heavy metals from wastewater in bench scale application.

Autor: Nguyen QH; Faculty of Environmental Sciences, University of Science, Viet Nam National University, Hanoi, Vietnam.; Laboratory for Process Engineering for Sustainable Systems, Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium., Tran ATK; Faculty of Chemical and Food Technology, HCM University of Technology and Education, Ho Chi Minh City, Vietnam. anhttk@hcmute.edu.vn., Hoang NTT; Faculty of Chemical and Food Technology, HCM University of Technology and Education, Ho Chi Minh City, Vietnam., Tran YTH; Faculty of Chemical and Food Technology, HCM University of Technology and Education, Ho Chi Minh City, Vietnam., Nguyen PX; Faculty of Chemical and Food Technology, HCM University of Technology and Education, Ho Chi Minh City, Vietnam., Pham TT; Faculty of Environmental Sciences, University of Science, Viet Nam National University, Hanoi, Vietnam., Nguyen MK; Faculty of Environmental Sciences, University of Science, Viet Nam National University, Hanoi, Vietnam., Van der Bruggen B; Laboratory for Process Engineering for Sustainable Systems, Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2022 Jun; Vol. 29 (28), pp. 42074-42089. Date of Electronic Publication: 2022 Feb 07.
DOI: 10.1007/s11356-022-19013-4
Abstrakt: Single-use plastic waste is gradually considered a potential material for circular economy. Ion exchange resin obtained from polystyrene waste by sulfonating with H 2 SO 4 was used for heavy metal removal from electroplating wastewater. Batch mode experiments of Cu 2+ , Zn 2+ , and Cd 2+ were carried out to determine effect of pH, initial concentration, equilibrium time, and the isotherm and kinetic parameters; the stability of the resin in continuous operation was then evaluated. Finally, the longevity of the resin after being exhausted was explored. The results indicated that at pH 6, a pseudo-second-order kinetic model was applicable to describe adsorption of studied heavy metals by sulfonated polystyrene with adsorption capacities of 7.48 mg Cu 2+ /g, 7.23 mg Zn 2+ /g, and 6.50 mg Cd 2+ /g, respectively. Moreover, the ion exchange process between sulfonated polystyrene resin and Cu 2+ , Zn 2+ , Cd 2+ ions followed the Langmuir isotherm adsorption model with R 2 higher than 96%. The continuous fixed-bed column in conditions of a sulfonated polystyrene mass of 500 g, and a flow rate of 2.2 L/h was investigated for an influent solution with known initial concentration of 20 mg/L. Thomas and Yoon-Nelson models were tested with regression analysis. When being exhausted, the sulfonated polystyrene was regenerated by NaCl in 10 min with ratio 5 mL of NaCl 2 M per 1 g saturated resins. After 4 times regeneration, the heavy metal removal efficiency of sulfonated polystyrene was reduced to 50%. These aforementioned results can figure out that by sulfonating polystyrene waste to synthesize ion exchanging materials, this method is technically efficient and environmentally friendly to achieve sustainability.
(© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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