Brewers' spent grain in adsorption of aqueous Congo Red and malachite Green dyes: Batch and continuous flow systems
| Autor: | John Mmari Onyari, Harry Amuguni Chanzu, Paul M. Shiundu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Exothermic process Health Toxicology and Mutagenesis 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences 01 natural sciences symbols.namesake chemistry.chemical_compound Adsorption Monolayer Rosaniline Dyes Environmental Chemistry Malachite green Waste Management and Disposal 0105 earth and related environmental sciences 021110 strategic defence & security studies Aqueous solution Chemistry Temperature Langmuir adsorption model Sorption Congo Red Hydrogen-Ion Concentration Pollution Congo red symbols Thermodynamics Edible Grain Water Pollutants Chemical Nuclear chemistry |
| Zdroj: | Journal of hazardous materials. 380 |
| ISSN: | 1873-3336 |
| Popis: | Sorption of Congo Red (CR) and Malachite Green (MG) dyes currently used in pigments and clothing industries were investigated using brewers’ spent grain (BSG) from a local brewery. Adsorption increased with a higher adsorbent weight and lower colorant concentrations. Accumulation of CR and MG was optimal at acidic pH and neutral pH respectively. Sorption decreased with an increase in temperature signifying an exothermic process. Batch adsorption data fitted better to Langmuir adsorption isotherm model and pseudo-second-order kinetics. Maximum monolayer coverage capacities ( Q O ) ) were found to be 2.55 mg/g for MG and 36.5 mg/g for CR dye. Column studies using BSG were also conducted for both dyes. Fixed bed breakthrough was fast with an increase in dye concentration, adsorbent surface area, and flow rate and with a decrease in column depth. BSG are effective, simple in design and inexpensive adsorbing material from renewable sources. |
| Databáze: | OpenAIRE |
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