Biodegradation of p-nitrophenol sorbed onto crystal violet-modified organoclay by Arthrobacter sp. 4Hβ
| Autor: | Shay Zohar, Gurinaz Jander-Shagug, Segula Masaphy |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
biology
Sorption General Medicine Biodegradation biology.organism_classification Applied Microbiology and Biotechnology Water Purification Nitrophenols chemistry.chemical_compound Nitrophenol Montmorillonite Bioremediation chemistry Arthrobacter Organoclay Organic chemistry Clay Aluminum Silicates Gentian Violet Crystal violet Adsorption Biotechnology Nuclear chemistry |
| Zdroj: | Applied microbiology and biotechnology. 98(3) |
| ISSN: | 1432-0614 |
| Popis: | Organoclays are effective sorbents for removal of organic contaminants from water, but their regeneration capacity limits their practical use as a biotechnological process for bioremediation. Here, the sorption of p-nitrophenol (PNP) to crystal violet (CV)-modified montmorillonite and its biodegradation by the bacterium Arthrobacter sp. 4Hβ were studied in a batch aqueous system. The degree of PNP sorption was dependent on the degree of CV modification (loaded at 80 % or 100 % of the clay’s cation-exchange capacity—CVM80 and CVM100, respectively). CV sorption to the clay reduced its toxicity to bacteria. PNP at an initial concentration of 0.72 mM was degraded at rates of 65 % and 42 % in CVM80 and CVM100 suspensions, respectively. Both free and CV–clay-adsorbed PNP concentrations were reduced by the bacteria at rates proportional to the degree of CV modification. Three successive cycles of PNP reloading–degradation in the organoclay suspension demonstrated the potential of this matrix’s regeneration and reuse toward maximal removal efficiency of organic pollutants. |
| Databáze: | OpenAIRE |
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