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 À1 . 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 ¼ 2). TheCe-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.
T he extender properties of fly ash, a waste byproduct of thermal power stations, were
S. TIWARIassessed and compared with those of conventional extenders. T he development of protective M. SAXENA and decorative industrial coatings as solvent borne, cold curing, two pack epoxy systems, using fly ash as an extender, is reported. T he eVects of fly ash on coating properties and film characteristics are also discussed. A two body (high stress) abrasion test was conducted to assess the abrasion resistance of the coatings. It is concluded that the properties of fly ash that contribute to its usefulness as an extender are its abrasion resistance, chemical inertness, low oil absorption, and low specific gravity. T he coatings that were developed have shown improved corrosion and abrasion resistance and also better resistance to chemicals (5%Na 2 CO 3 , 1%NaOH, and 2%H 2 SO 4 ) and organic solvents (toluene and mineral spirit). Fly ash can be a cost eVective substitute for conventional extenders in high performance industrial coatings.
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