Electrospun chitosan–polyvinyl alcohol composite nanofibers loaded with cerium for efficient removal of arsenic from contaminated water

Abstract

Contamination of water due to arsenic has been extensively reported all over the world. It has led to massive epidemics of arsenic poisoning. An urgent need is being felt to develop efficient techniques for the removal of arsenic from contaminated water. In this context, cerium (Ce) loaded chitosan (CHT)–polyvinyl alcohol (PVA) composite (Ce-CHT/PVA) nanofibers were developed by electrospinning technique and have been employed for removing As(III). The Ce-CHT/PVA composite nanofibers efficiently adsorb As(III) and purify water below the prescribed limit of WHO/EPA. As(III) adsorption over the surface of Ce-CHT/PVA has been confirmed by scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDAX), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The quantitative estimation of As(III) has been carried out by flameless atomic adsorption spectrophotometer-hydride generator (AAS-HG) system. The As(III) adsorption efficiency of Ce-CHT/PVA composite nanofibers has been established as a function of pH, time, temperature and adsorbent dose. The adsorption data were best fitted to Langmuir isotherm, and the maximum adsorption capacity (q_m) was found to be 18.0 mg g⁻¹. The interference studies of several ionic species individually as well multi-element for As removal have also reported. The measurement of the uncertainty of As(III) determination was calculated after determining the contributing factors. The data are reported with a confidence level of 95% (K = 2). The Ce-CHT/PVA composite nanofibers are non toxic and can be directly used for water purification or after being embedded in the form of membrane or candles.