An efficient composite material for selective lead(II) monitoring and removal from wastewater

Abstract

The importance of toxic contaminants treatments have become increasingly apparent due to the severe threat from anthropogenic pollution in water pollutants. For the remediation of water contamination, novel material is always welcome based on the sensitivity and selectivity. The mesoporous composite material (MoCA) was fabricated by 2-methyl-8-quinolinol onto the porous silica by direct immobilization for toxic Pb(II) ion detection and removal. The solution pH was highly influenced and the MoCA was worked well at pH 5.50. The MoCA was formed the significant color upon addition of Pb(II) ion. The sensitivity was measured based on the signal intensity with ultra-trace Pb(II) ion contact. The detection limit was 0.21 μg/L, which was lower than the permissible limit of Pb(II) ion in water bodies. The affecting experimental parameters such as pH solution, initial concentration, contact time and foreign ions were systematically evaluated in detection and removal operations. The kinetic performance was comparatively high as the Pb(II) adsorption on the MoCA was reached in the equilibrium state in a short time. The adsorption data were highly fitted to the Langmuir isotherms model and maximum adsorption was found to be 206.17 mg/L. The presence of diverse foreign ion was not affected by Pb(II) capturing by the MoCA. In addition, the Pb(II) ion from MoCA was completely desorbed with 0.10 M HCl and able to reused for several cycles without significant loose of performances. Therefore, the solid design composite material is efficient and cost-effective promising material for selective Pb(II) ion detection and removal from wastewater.