Efficient toxic nitrite monitoring and removal from aqueous media with ligand based conjugate materials

Abstract

This study aims to develop a highly selective conjugate material for efficient optical detection and adsorption of nitrite (NO2−) ion from waste solutions. In the present study, 1-naphthylamine ligand based conjugate material was fabricated for efficient NO2− capturing. The material was formed color and corresponding signal intensity upon addition of NO2− ion. Several experimental parameters such as materials morphology, solution acidity, contact time, competing ion, elution, maximum adsorption capacity were determined. The data clarified that the material was able to recognize the trace level NO2− based on the limit of detection of 0.23 μg/L. The solution pH was exhibited the key role and the suitable pH 4.0 was selected based on the signal intensity and adsorption efficiency. The competing ion was not affected the NO2− ion detection and removal by the material. In addition, the signal intensity was observed only for the NO2− ions and this was clarified the high selectivity towards the NO2− ions at the optimum experimental conditions. Moreover, the adsorption data were highly fitted to the Langmuir adsorption model with the monolayer coverage as the material surface was ordered homogeneity. The maximum adsorption capacity was 135.21 mg/g, which was comparable with the other forms of recent material. The materials was exhibited the high reusability based on the desorption performances. The elution was performed using 0.20 M NaOH and then the material was ready to use after washing with water without significant loss in its performance. Therefore, the data are promising to use the material in real samples treatment. Moreover, the proposed materials will attract the scientific community as suitable nanomaterial for NO2− detection and removal from contaminated water samples.