Removal of pharmaceutical pollutants from synthetic wastewater using chemically modified biomass of green alga Scenedesmus obliquus
| Autor: | Mohamed E.M. Ali, Rizka K. Ali, Mohamed I. Badawy, Azza M. Abd El-Aty |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Health
Toxicology and Mutagenesis Biomass Portable water purification 02 engineering and technology 010501 environmental sciences Wastewater 01 natural sciences Water Purification Adsorption Freundlich equation Scenedesmus Decontamination Tramadol 0105 earth and related environmental sciences biology Chemistry Public Health Environmental and Occupational Health Biosorption General Medicine Human decontamination 021001 nanoscience & nanotechnology biology.organism_classification Pollution Kinetics Pharmaceutical Preparations 0210 nano-technology Water Pollutants Chemical Nuclear chemistry |
| Zdroj: | Ecotoxicology and environmental safety. 151 |
| ISSN: | 1090-2414 |
| Popis: | Pharmaceutical compounds are considered emerging environmental pollutants that have a potential harmful impact on environment and human health. In this study, the biomass of alga (Scenedesmus obliquus) was modified using alkaline solution, and used for the biosorption of tramadol (TRAM) and other pharmaceuticals. The adsorption kinetics and isotherms were investigated. The obtained results reveal high adsorption capacity of tramadol over modified algal biomass (MAB) after 45min with removal percentage of 91%. Pseudo-second order model was well fitted with the experimental data with correlation coefficient (0.999). Biosorption of tramadol on modified algal biomass proceeds with Freundlich isotherm model with correlation coefficient (0.942) that emphasized uptake of TRAM by MAB is driven by chemisorption. FTIR spectra of MAB before and after the adsorption were analyzed; some IR bands were detected with slight shift and low intensity suggesting their involving in adsorption. The tramadol biosorption by MAB is a chemical process as confirmed by Dubinin-Radushkevich. The adsorption of pharmaceutical over MAB is mainly preceded by hydrophilic interactions between amino and carbonyl groups in pharmaceutical molecules and hydroxyl and carbonyl functional groups on surface of biosorbent. It was emphasized by disappearance O-H and C-O from biomass IR spectra after adsorption. In matrix of pharmaceutical, the recorded adsorption capacities for CEFA, PARA, IBU, TRAM and CIP are 68, 58, 42, 42 and 39mg/g over MAB at natural pH and MAB dose of 0.5g/L. Furthermore, oxygen uptake by bacteria was applied for estimate the toxicity of pharmaceutical. The recorded result concluded the efficient reusability of modified algal biomass for biosorption of pharmaceuticals, as well only the adsorption efficiency decreased by 4.5% after three runs. Subsequently, the modified algal biomass is a promising reusable adsorbent for decontamination of wastewater from pharmaceuticals. |
| Databáze: | OpenAIRE |
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