Interactions of As III As V P III and P V ions with iron oxide based materials

Abstract

Arsenic As is one of the major contaminants in drinking water in many parts of the world Various parts of India Bangladesh Cambodia South Africa Argentina United States and other countries have arsenic in the groundwater to an extent more than the permissible limit namely 10gL1 10 ppb prescribed by the World Health Organization WHO 2011 Arsenic and its associated problems are still a great threat to human health such as arsenicinduced cancers Hyperkeratosis Black foot disease etc However there is still no effective treatment for chronic arsenic poisoning Ratnaike et al 2003 Seidl et al 2019 Reichard et al 2010 newlineArsenic occurs in natural waters as either arsenite AsIII or arsenate AsV Amini et al2008 Both forms of arsenic have a strong affinity for iron oxideoxyhydroxide surfaces near neutral pH Bhattacharya et al 2017 Iron oxide nanoparticles are also effective for the removal of other metals such as V Cr Co Mn Se Mo Cd Sb Tl Th and U Shipley et al 2011 Use of nanoadsorbents for the removal of heavy metal ions from water is particularly attractive as they can be altered suitably to achieve greater surface area and stronger binding capacity Magnetite nanoparticles have certain advantages due to their superparamagnetic properties ease of preparation and biocompatibility However agglomeration and the loss of magnetic strength over time resulting from autooxidation limits the commercial application of bare iron oxide nanoparticles Alijani et al 2017 Rashid et al 2018 newlineIn the last decade various nanostructured composites have been used to remove arsenic from water namely graphene oxideMnFe2O4 nanohybrids FeCu binary oxides nanocrystalline TiO2 superparamagnetic Mg027Fe25O4 GOZrOOH2 nanocomposites GNPFeMg oxide etc Recently researchers have looked at several bioadsorbents like Eichhornia crassipes powders of roots which are locally available Several spectroscopic and theoretical studies has been done for to investigate the AsIIIV interactions with iron oxide polymorphs The binding mechanism of arsenic with iron oxide