Removal of anionic arsenate by a PEI-coated bacterial biosorbent prepared from fermentation biowaste
| Autor: | Munsik Park, Yeoung-Sang Yun, Donghee Park, Namgyu Kim |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis 0208 environmental biotechnology Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Water Purification Chitosan chemistry.chemical_compound Adsorption Environmental Chemistry Neutral ph Arsenic 0105 earth and related environmental sciences Polyatomic ion Public Health Environmental and Occupational Health Biosorption Arsenate General Medicine General Chemistry Pollution 020801 environmental engineering chemistry Fermentation Arsenates Water Pollutants Chemical |
| Zdroj: | Chemosphere. 226 |
| ISSN: | 1879-1298 |
| Popis: | As a problematic element in water systems, arsenic exists as As(III) and As(V). Adsorption techniques can be used to remove anionic As(V) as it is present as a polyatomic anion. In the case of As(III) which exists in zero-valent state under neutral pH, it can be also removed by adsorption after being converted into As(V). Many inorganic and organic materials have been examined as potential adsorbents for anionic As(V) removal. However, most exhibit relatively low adsorption capacities (10 mg/g). The objective of this study is to examine As(V)-removal mechanism and practical potential of a PEI-coated bacterial biosorbent prepared from fermentation biowaste. The maximum As(V) uptake of the biosorbent was determined to be 62.99 mg/g by Langmuir model. The effects of various parameters including pH, biosorbent dosage, ionic strength and temperature were also examined. Kinetic and equilibrium models were used to interpret the experimental data mathematically. A 0.01 M NaOH solution was chosen as an effective As(V)-desorbing eluent for biosorbent regeneration. The adsorption capacity of the biosorbent remained above 85% over three successive cycles of adsorption and desorption. In conclusion, the biowaste-driven biosorbent is a promising anion adsorbent for treatment of As(V)-contaminated wasters. |
| Databáze: | OpenAIRE |
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