Search

The present report deals with the identification of new bacteria for the degradation of sulphonated azo dye such as methyl orange because this type of dye is difficult to degrade by the physico-chemical method. Hence, an eco-friendly and efficient technique like biological method was studied to degrade methyl orange. Initially, three strains were isolated from the flasks containing media amended with textile wastewater using the serial dilution process. Out of three strains, micrococcus yunnanensis exhibited a higher decolourization efficacy in 100 mg L−1, and hence, this strain was chosen for further optimization studies and metabolites identification. This is the first report to study the micrococcus species in methyl orange degradation according to our knowledge. The optimum parameters for the decolourization of methyl orange were found to be pH 7, temperature at 30 °C and dye concentration at 100 mg L−1. The carbon source and nitrogen source suited well for the decolourization were observed as 1% glucose and 1% peptone. The metabolites obtained after degradation of methyl orange were analysed using FT-IR and GC–MS analysis. The final product obtained from the degraded sample was found to be N, N-Diethyl-N'-methyl-1,3-propane diamine. [ABSTRACT FROM AUTHOR]

The objective of the current study was focused on the potential adsorption capability of a biogenic hydroxyapatite/iron nanoparticles-based composite tailored for the elimination of toxic pollutant, Cd(II) ions. Morphological along with physicochemical properties of composites were analyzed by different techniques including Scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDAX), X-ray diffraction (XRD), and Fourier Transform Infrared Spectroscopy (FTIR). It has been noticed an increase in cell parameters of prepared composites with an increase in the amount of nanoparticles. The best adsorbent was found to be the one with a 5% amount of nanoparticles (P 400 F e (5%)). The kinetics studies have shown that the pseudo-first-order-models were in good agreement for the removal of Cd(II) ions onto P 400 Fe(5%) at any concentration, suggesting a physisorption mechanism. Besides, isotherms analysis has consistently revealed Freundlich as the model better explained the isotherm data, with a maximum removal capacity of 392.3 mg g−1, higher compared to many adsorbents. Thermodynamically, the removal adsorption process of Cd(II) ions onto the composite favorable, exothermic, and spontaneous. The regeneration study has been also investigated with reusability used until four cycles. The overall results pointed out the suitability and efficiency of the prepared biogenic composite for the elimination of metal pollutants in wastewater. [Display omitted] • Biogenic composites were successfully prepared from slaughterhouses by-product and iron nanoparticles. • The maximum adsorption capacity of P 400 Fe(5%) was up to 392.3 mg g−1. • The isotherm and kinetic data best fits Freundlich and pseudo-first-order models. • The mechanism could be due to cationic exchange between Ca2+ and Cd2+. • The biogenic composite was effective for four consecutive regeneration cycles. [ABSTRACT FROM AUTHOR]