Abstract
To counter the toxic effects of Cr(VI) ions in industrial wastewater, adsorption onto a suitable adsorbent is prudent, but the resulting secondary waste accumulation and cleaning are challenging. Herein, biocompatible alginic acid has demonstrated selective adsorption of Cr(VI) ions with the subsequent conversion of the secondary waste into valuable materials. The maximum sorption was found to be 143 mg/g, and the adsorption follows the Langmuir model and pseudo-second-order kinetics. The process was tested with a simulated tannery effluent where selective Cr(VI) adsorption was achieved, and the secondary waste was converted to Cr2O3 and ZnCrO4. The remaining ions present Na+, Cl+, SO42- have been consolidated into an apatite mineral with the molecular formula of Ca4.1Na0.9(P0.7S0.3O4)3Cl. Overall, our integrated process of removing and converting Cr(VI) ions into beneficial by-products opens up a window of opportunities for large-scale water purification and industrial applications.
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