A novel CO2 activation at room temperature to prepare an engineered lanthanum-based adsorbent for a sustainable arsenic removal from water

A novel activation route for the preparation of carbon-based adsorbents functionalized with lanthanum and their application arsenic adsorption was proposed. This procedure is based on carbon dioxide at room temperature, which could allow to reduce energy consumption adsorbent cost. comparison this approach respect conventional thermal 800 °C under N2 atmosphere performed biochar from avocado seeds lanthanum. Results showed that properties lanthanum-functionalized activated CO2 temperature were higher up 179% than those °C. The carbonation oxygenated functionalities surface favored ligand exchange complexation interactions during adsorption. Arsenic using engineered lanthanum-based endothermic transited a multi-molecular process 25 multi-anchorage 30 estimated capacities saturation these 15 – 20 mg/g 40 °C, respectively.