Dual-function hydrogel composite for post-electroplating cationic and anionic metal removal: A practicality study
| Autor: | Mohammad A.H. Badsha, Irene M.C. Lo |
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| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Materials science Health Toxicology and Mutagenesis Composite number Public Health Environmental and Occupational Health Cationic polymerization Hydrogels General Medicine General Chemistry Pollution Electroplating Adsorption Chemical engineering Desorption Cations Environmental Chemistry Humans Process optimization Response surface methodology Effluent Water Pollutants Chemical |
| Zdroj: | Chemosphere. 291(Pt 3) |
| ISSN: | 1879-1298 |
| Popis: | Metals produced as by-products of the electroplating process pose threats to both human and environmental health, so it is important that they are removed from electroplating effluents. In this study, a dual-function hydrogel composite, prepared from a pair of cationic and anionic hydrogel composites via a facile method, was tested in batch and in a fluidized-bed column to treat a simulated electroplating effluent. For the batch treatment, both adsorption and desorption reached equilibrium within 30 min, showing the dual-function composite's fast adsorption capacity. Additionally, the removal efficiency was found to be pH-independent, and insignificant effect was found in the co-presence of monovalent ions (up to 10 meq L−1). Reusability of the dual-function composite was tested for six cycles, where the treated effluent consistently met discharge standards, and the reused adsorbent was confirmed by Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy to be highly stable. The fast settling by gravity of the dual-function composite in batch motivated further studies of the material in a fluidized-bed column. Process variables such as feed flow, airflow, and adsorbent's bed depth were optimized using response surface methodology (RSM). Using an optimal solution, the model predicted a treatable cationic volume of 1045 mL and an anionic volume of 1695 mL; their corresponding experimental values were 1028 and 1680 mL. Therefore, in terms of practicality (fast removal, pH-independence, high stability, and gravity-driven settling), the application of the dual-function composite in a fluidized-bed reactor has shown much promise for the simultaneous removal of post-electroplating cationic and anionic metals. |
| Databáze: | OpenAIRE |
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