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Abstract
Chitosan (CHI)-stabilised Ni–Fe bimetallic nanoparticles (bNP/CHI) were synthesised varying the content of nickel and denoted as 2-bNP/CHI, 17-bNP/CHI, and 27-bNP/CHI. The nanoparticles were characterised using several techniques and used in the removal of nimesulide. XRD and Mössbauer analyses confirmed the formation of an amorphous structure containing Fe0 and Fe2O3 while the FT-IR analysis confirmed the presence of chitosan in the nanoparticles. A very high removal of nimesulide was obtained after only 15 min of treatment with the 17-bNP/CHI system. The by-product obtained after the reductive treatment was identified using the chromatography analysis coupled to the mass spectrometry technique.
Highlights
Several organic substances used by the modern society are important pollutants which cause deleterious effects on the environment
The aims of the present work are: (i) the fabrication and characterisation of bimetallic nanoparticles composed of Fe and Ni stabilised with chitosan (CHI), denoted as bNP/CHI, and (ii) the study of the removal/transformation of nimesulide (NMS) in contaminated water during the redox reaction with the bNP/CHI system
The suspension containing the chitosan (CHI)stabilized Ni0–Fe0 nanoparticles denoted as bNP/CHI(susp.) is very active for promoting the removal/transformation of nimesulide present in water
Summary
Several organic substances used by the modern society are important pollutants which cause deleterious effects on the environment. Several organic substances are classified as “emerging contaminants” and their occurrence in the environment is caused by the anthropic activities. Despite the fact that the pollution burden is commonly found at low levels in the environment (e.g., in water bodies, in parts per billion or parts per trillion)[1,2,3], it is verified the simultaneous occurrence of several different anthropic substances for a given contaminated sample. It is a fact that the emerging pollutants are not efficiently removed from contaminated waters and effluents using the traditional technologies based on physical and biological processes[3]
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