Phosphorus removal from aqueous solutions by adsorptive concrete aggregates

The purpose of this study is to investigate the adsorption characteristics granular aggregates under identical experimental conditions for potential applications in highly adsorptive concrete. In study, industrial by-products (steel slag), lightweight (expanded silica) and bio-materials (peach shell miscanthus) are used phosphorus (P) removal from aqueous solutions. effects several parameters such as initial concentrations P, reaction time pH value on capacity efficiency P investigated using an IC analyzer. Results show that all absorbents follows isotherms with a varying concentration 5 mg/L 700 mg/L, data fitted well by Langmuir equation. steel slag exhibits higher P-adsorption compared bio-materials, estimated maximum 20.4 mg/g. Moreover, P-desorption results has very low P-desorption. Heat treatment increase miscanthus owing change pore structure determined BET. kinetic pseudo-second-order model. ICP-AES, XRD SEM-EDS analyses peach physical adsorption, whereas mechanism can be attributed Ca2+ released slag, which react form stable Ca–P precipitate. It suggested slags function effective aggregate manufacture