Abstract

Application of newly syntheticHP-Cr-III-containing nano-mica-clay for stepwise remediation of industrialwater-drains fromsome toxic heavy metals, Part-2: Size cavity calculations&silicate structure visualization

Author(s):M.Khaled Elsabawy, F.Waheed El-Hawary, A.El.Maghraby

Mixed solid state / solution routes were applied to synthesize newfamily of free-fluoride synthetic clay for water remediation applications. To facilitate the incorporation of the cations the solution route was applied with some hydrothermal conditions and complexing with organic moiety (Ethylene glycol). The sample of synthetic free fluoride –Na-4-mica was having the general formula (Na4Mg6M4Si4O22.nH2O) where M = Cr3+. Structural and micro-structural propertiesweremonitoring by using both ofXRD and SEM evaluating, grain size of themica bulkwas found to be in between 2.27- 3.33 ìm which are lower than those reported in literatures. Synthetic clay was tested and applied three times (stepwise) as a cations selective remediator. Analytical investigations were made by using ICP-Ms spectroscopy. Investigations proved that synthetic Cr(III)-type clay has medium-to-strong efficiency as cation selective clay towards heavy metals tested. To confirm the synthesized 4Na-mica with general formula Na4Mg6M4Si3AlO22.nH2O that prepared via solution route where M = Cr+++ theoretical treatment was made by visualizing of tetrahedrally NaMg –silicates unit cell that considered the main constituent of molecular sieving layers that responsible together with cation exchanging strength (4Na-mica) for removal of investigated heavy metals cations namely(201Hg++, 207Pb++, 112Cd++ and 139La+++).