In studies of adsorption of phenol and nitrophenols on carbonaceous materials, it was found that the adsorption of phenolics followed the sequence 2,4-DNP >2-NP > phenol, and this behavior is associated to pH from the solution and the content of surface groups on the activated carbon.
Adsorption of phenol and nitrophenols by carbon nanospheres: Effect of pH and ionic strength.
and methylphenol sources have been related to vehicular emissions [6,7] Phenols may occur naturally via biodegradation of humic products, for example tannins and lignins .
The decrease in current response also indicates that the electrode cannot be applied for the detection of nitrophenols
are known protonophores and have been used in structural alert models to define uncouplers (Naven et al.
Theobtained Ni NPs accelerated the decomposition of NaBH4 to generate hydrogen  and catalyzed the reduction reaction of nitrophenols
Depending on the electrolysis conditions, a great variety of products can be obtained by electroreduction of nitrophenols
Degradation of aqueous nitrophenols
and nitrobenzene by means of the Fenton reaction.
Substances such as phosgene, N-ethyl carbazole, and hexanitrodiphenylamine a lso underwent analysis, and synthetic work included the preparation of tetranitromethane, nitrophenols
(from benzene), trinitrophenylnitramine, 2,4,6-trinitrobenzene, and organic perchlorates.
4-D),4-chloro-2methylphenoxyacetic acid (MCPA), 2,4,5-trichloro-phenoxyacetic acid (2,4,5-T), 2-buthyl-4,6-dinitrophenol (dinoseb), and phenolic biocides like pentachlorophenol (PCP)  and from atmospheric depositions  Moreover, nitrophenols
and methylphenol sources have been related to vehicular emissions [10,11].
AOPs are suited for destroying dissolved organic contaminants such as halogenated hydrocarbons (trichloroethane, trichloroethylene), aromatic compounds (benzene, toluene, ethylbenzene, xylene--BTEX), pentachlorophenol (PCP), nitrophenols
, detergents, pesticides, etc.
are common components of industrial effluents and have been detected in urban and agricultural waste.