Adsorption of Phosphate Ions from Aqueous Solutions using Marble, Pumice, and Basalt Triple Combination

摘要

This study aims to employ marble, pumice, and basalt combination for phosphate ions adsorption. Response surface methodology (RSM) was used to optimize the preparation method. The optimum mixture of marble, pumice, and basalt was used as an adsorbent for phosphate removal, where RSM optimized the adsorption process. The maximum removal efficiency was obtained when the combination was 0.5 marble: 0.25 pumice: 0.25 basalt. All the developed models (preparation, capacity, and removal efficiency models) were found to be significant and adequately precise to describe model space. The maximum removal efficiency reached 94 at pH 2, initial phosphate ions concentration of 10 mg/L, and contact time of 60 min. The adsorption of phosphate ions onto the prepared adsorbent was found to follow the Freundlich isotherm and the pseudo-second-order model. The phosphate adsorption onto the prepared adsorbent was feasible and naturally spontaneous. At the end of the study, the adsorption of phosphate onto the rock combinations was realized successfully and the generation of second-order pollutants was prevented since the prepared adsorbent can be utilized in the soil enrichment.