Abstract
AbstractThe use of low-cost and locally available material in the treatment of wastewater has recently become an issue of interest, and magnesite as a low-cost material has been used for the removal of heavy metals in wastewater and has also shown potential as an adsorbent for the removal of phosphates in wastewater. In this study, batch experiments were conducted to evaluate the effectiveness of cryptocrystalline magnesite in the removal of phosphates from wastewater. Parameters optimized include the following: contact time, dosage, ions concentration and pH. Optimum conditions were observed to be 60 min of agitation, 1 g of dosage, 100 mg L−1 ions concentration, 1:100 S/L ratios and pH 10. The phosphate removal efficiency was found to be greater than 99% at an adsorption capacity of 20 mg g−1 of magnesite under the optimized conditions. Adsorption kinetics fitted well to pseudo-second-order kinetics than pseudo-first-order kinetics with pore diffusion also acting as a major rate governing step, hence pr...
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