Rapid and high-efficiency removal of methylene blue onto low-cost activated sludge: Role and significance of extracellular polymeric substances
| Autor: | Bin Du, Ben Wang, Qin Wei, Dong Wei, Bingfeng Wang, Fangyu Ju, Yingrui Liu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Renewable Energy Sustainability and the Environment Chemistry 020209 energy Biosorption Langmuir adsorption model Bioengineering Sorption 02 engineering and technology 010501 environmental sciences 01 natural sciences Matrix (chemical analysis) symbols.namesake chemistry.chemical_compound Activated sludge Adsorption Extracellular polymeric substance Chemical engineering 0202 electrical engineering electronic engineering information engineering symbols Waste Management and Disposal Methylene blue 0105 earth and related environmental sciences |
| Zdroj: | Bioresource Technology Reports. 7:100240 |
| ISSN: | 2589-014X |
| DOI: | 10.1016/j.biteb.2019.100240 |
| Popis: | In the present study, a low-cost adsorbent of activated sludge was used for the rapid and high-efficiency adsorption of methylene blue (MB) from solutions. The role of extracellular polymeric substances (EPS) during the biosorption process was explored by spectroscopic techniques. Batch experiments implied that MB sorption onto activated sludge fits both a pseudo second order kinetic model and the Langmuir isotherm model regardless of the presence or absence of EPS. The adsorption process reached equilibrium at 10 min, and the maximum adsorption capacity (qm) of MB onto sludge was 366.3 mg/g. The combination of an excitation-emission matrix (EEM) and two-dimensional correlation spectroscopy (2D-COS) was employed to explore the interaction between EPS and MB. EEM suggested that protein-like substances were the major component of EPS for MB interaction. 2D-COS found that MB interacts with EPS components in the following order: humic-like fractions > protein-like fractions. |
| Databáze: | OpenAIRE |
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