Novel nano-conjugate materials for effective arsenic(V) and phosphate capturing in aqueous media

Abstract

In this study, the ligand functionalized nano-conjugate material was developed for the sensitive and selective detection and removal of toxic arsenic(V) and phosphate ions in aqueous media. The nano-conjugate material was fabricated based on the use of metal-organic frameworks with exhibited of high surface area, pore morphology, and tuneable shape. The newly design nano-conjugate material was exhibited the naked eye monitoring of the ultra-trace arsenic(V) and phosphate in a simple, fast, cost-effective and easy-to-use approach. The data clarified that the arsenic(V) and phosphate adsorption process were found to be relatively fast. The adsorption isotherms of arsenic(V) and phosphate from aqueous solutions to the nano-conjugate material were measured, and the results showed that the Langmuir isotherm was found to be the best represent the measured adsorption data. The maximum adsorption capacity was 82.40 and 70.47mg/g for arsenic(V) and phosphate, respectively. The arsenic(V) and phosphate detection and removal were not affected in the presence of co-existing divers ions. Calibration curves were demonstrated by using UV–Vis spectrophotometric and digital image-based colorimetric analysis. The linear correlation obtained from the two methods, and the detection limit of arsenic(V) and phosphate were 0.15 and 0.13μg/L, respectively. In addition, the nano-conjugate material was regenerated by 0.20M NaOH treatment the arsenic(V) and phosphate detection or removal efficiency was retained almost as that of the original performance. In addition, the nano-conjugate material was applied to the determination and removal of arsenic(V) and phosphate in natural and industrial water samples. Therefore, the newly developed nanomaterial has potentiality for efficient detection and removal of arsenic(V) and phosphate in the real wastewater samples.