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Recyclable Adsorbents Based on Ceria Nanostructures on Mesoporous Silica Beads for the Removal and Recovery of Phosphate from Eutrophic Waters

While phosphorous (P) is an essential non-renewable resource and a key nutrient for agricultural production, its excessive accumulation in the environment can cause overgrowth of water plants and algal blooms that produce dangerous toxins and create “dead zones” in the body of water, leading to eutrophication. Main approaches to remove P in its most abundant and stable form, phosphate (PO43-), involve the use of carbon-based adsorbents that are relatively non-specific, have limited sorption capacity and cannot be used to recover this critical resource. Herein, we report a ceria (CeO2)-based adsorbent that has the capability to rapidly and reversibly capture PO43- enabling its further recovery for potential reuse. The adsorbent consists of ceria nanoparticles patterned on mesoporous silica (CeO2-SiO2) which can bind PO43- through ion exchange and Lewis-acid based interactions. The adsorbent shows excellent sorption/desorption capability of up to 110 mg/g with 99% removal within 60 minutes. The adsorbent ma...