Compound-specific isotope analysis (CSIA) is a promising approach for tracking biotransformation of organic pollutants, but isotope fractionation associated with aromatic oxygenations is only poorly understood. We investigated the dioxygenation of a series of nitroaromatic compounds to the corresponding catechols by two enzymes, namely, nitrobenzene and 2-nitrotoluene dioxygenase (NBDO and 2NTD...

From extraction experiments and γ-activity measurements, the exchange extraction constant corresponding to the equilibrium K+ (aq) + 1•Cs+(nb)sipky &#x21C4 1•K+ (nb) + Cs+(aq) taking part in the two-phase water-nitrobenzene system (1 = hexaarylbenzene - based polyaromatic receptor; aq = aqueous phase, nb = nitrobenzene phase) was evaluated as log Kex (K+, 1•Cs+) = -1.0 ± 0.1. Further, the stabi...

After discovering that toluene 4-monooxygenase (T4MO) of Pseudomonas mendocina KR1 oxidizes nitrobenzene to 4-nitrocatechol, albeit at a very low rate, this reaction was improved using directed evolution and saturation mutagenesis. Screening 550 colonies from a random mutagenesis library generated by error-prone PCR of tmoAB using Escherichia coli TG1/pBS(Kan)T4MO on agar plates containing nitr...

A functionalized plasmonic Au/TiO2 photocatalyst with an Ag co-catalyst was successfully prepared by the combination of two types of photodeposition methods, and it quantitatively converted nitrobenzene and 2-propanol to aniline and acetone under irradiation of visible light.

Structural, magnetic, calorimetric and Mössbauer studies of the cooperative spin crossover naphthalene and nitrobenzene clathrates of the novel Fe(II) Hofmann-like porous metal-organic framework {Fe(bpb)[Pt(CN)4]}·2Guest are described (bpb = bis(4-pyridyl)butadiyne).

The main objective of this study was to test the possibility that graphene-based nanomaterials can mediate environmentally relevant abiotic redox reactions of organic contaminants. We investigated the effect of graphene oxide (GO) on the reduction of nitrobenzene by Na2S in aqueous solutions. With the presence of GO (typically 5 mg/L), the observed pseudofirst-order rate constant (kobs) for the...

Replacement of precious noble metal catalysts with low-cost, non-noble heterogeneous catalysts for chemoselective reduction and reductive coupling of nitro compounds holds tremendous promise for the clean synthesis of nitrogen-containing chemicals. We report a robust cobalt-nitrogen/carbon (Co-N x /C-800-AT) catalyst for the reduction and reductive coupling of nitro compounds into amines and th...

From extraction experiments and γ-activity measurements, the exchange extraction constant corresponding to the equilibrium N2H+5 (aq) + 1.Cs+(nb) <-> 1.N2H+5 (nb) + Cs+(aq) taking place in the two-phase water-nitrobenzene system (1 = hexaarylbenzene - based receptor; aq = aqueous phase, nb = nitrobenzene phase) was evaluated as log Kex (N2H+5, 1.Cs+) = -1.2 ± 0.1. Further, the stability constan...

Currently, the catalytic reduction of nitrobenzene requires more efficient and low-cost catalysts. In this work, a new copper-based metal-organic framework (MOF) was designed by calcination Cu–MOF at 700 °C (denoted as Cu@C). The catalyst showed superior performance toward nitrobenzene, using sodium borohydride (NaBH4) reducing agent, exhibited high conversion (100%) quick reaction time (8 min)...