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In the scope, the developed novel ZnSeO3/g-C3N4 nanocomposites and characterized in detail. Interestingly, the as prepared nanocomposites examined for the detoxification of organic pollutants like methyl parathion (MP) and cefuroxime drug (CF) under Visible light irradiation. The synthesized ZnSeO3/g-C3N4 nanocomposites were characterized by various techniques such as X-ray diffraction (XRD), fourier transform infra-red (FTIR), UV–Vis diffuse reflectance spectra (DRS/UV–Vis), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectra (EDX). The photocatalytic studies carried out by UV–Visible Spectroscopy it was exhibited that ZnSeO3/g-C3N4 nanocomposites photocatalyst was a superior photocatalytic performance with the degradation efficiency of an analytic solution of MP and CF observed about 120 mins and 80 mins. The reactive oxidative species are ·OH radical and superoxide radical O2•− involved in the photocatalytic reaction under the source of visible light irradiation by trapping experiments. After the completion of degradation process, the photocatalyst was reused by centrifugation method. The reusability of photocatalyst was highly stable up to eighth cycle. [ABSTRACT FROM AUTHOR]

Pseudomonas sp. strain NyZ402, a native soil organism that grows on para-nitrophenol (PNP), was genetically engineered for the simultaneous degradation of methyl parathion (MP) and ortho-nitrophenol (ONP) by integrating mph (methyl parathion hydrolase gene) from Pseudomonas sp. strain WBC-3 and onpAB (ONP 2-monooxygenase and ONP o-benzoquinone reductase genes) from Alcaligenes sp. strain NyZ215 into the genome of strain NyZ402. Methyl parathion hydrolase (MPH), ONP 2-monooxygenase (OnpA) and o-benzoquinone reductase (OnpB) were constitutively expressed in the engineered strain NyZ-MO. Strain NyZ-MO was free of exogenous antibiotic resistance gene markers and the introduced genes were genetically stable. Degradation experiments showed that strain NyZ-MO could utilize MP or ONP as the sole carbon and energy source, and mineralize 0.1 mM MP–0.1 mM ONP simultaneously. This method may serve as a useful strategy for the construction of engineered strains in the degradation of multiple environmental pollutants. [ABSTRACT FROM AUTHOR]