Abstract
Chloronitrophenols (CNPs) constitute a group of environmental pollutants that are widely distributed in our surrounding environment due to human based activities. This group of chemicals is highly toxic to living beings due to its mutagenic and carcinogenic nature. Examples include 2-chloro-4-nitrophenol, 4-chloro-2-nitrophenol, 2-chloro-5-nitrophenol, 4-chloro-3-nitrophenol and 2,6-dichloro-4-nitrophenol. Several methods including advanced oxidation processes, adsorption and bacterial degradation have been used for degradation of CNPs. Among, bacterial degradation is an eco-friendly and effective way to degrade CNPs. Several bacterial metabolic pathways have been proposed for degradation of CNPs and their genes and enzymes have been identified in bacteria. These bacteria were able to degrade CNPs in broth culture and soil. Therefore, CNPs-degrading bacteria are suitable candidates for bioremediation of CNPs-contaminated sites. Few CNP-degrading bacteria exhibited chemotaxis towards CNPs to enhance their biodegradation. The present review summarizes recent progress in degradation of CNPs.
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