Selenium is present in soil in both Selenite (SeO32-) and Selenate (SeO42-) forms. Selenium is an essential element for metabolism regulation, DNA synthesis, and protection from infection in animals in addition to counteracting environmental stresses in plants. High concentrations (&gt; 2ppm) of these compounds in water results in toxicity, as they can alter protein structure and inhibit their function. Biochar allows an inexpensive and relatively simple avenue for water purification and soil remediation by adsorption. Four different biochars; Raw biochar (BC), magnetite modified biochar (MBC), 3:1 Fe:Mg LDH (FMBC3) and 1:1 Fe:Mg LDH (FMBC1) were used for sorptive removal of both Selenite and Selenite. Each biochar was equilibrated with aqueous solutions of Selenite or Selenate (at different pH, equilibrium time and concentration) and analysis of Se contents after sorption utilized ELAN DRC II ICP-MS. Adsorbents along with Se-laden adsorbents were characterized using PZC, BET, SEM, TEM, EDS, XRD and XPS. Preliminary data suggest that all four adsorbents are potential candidates for Se reclamation from water. Adsorption is sought to be governed by chemisorption, electrostatic interactions and ion-exchange. The complete understanding of the Se sorption Chemistry allows industrialization of this process to use in large scale water treatment. Se-laden biochars can also be used in soil amendment for Se deficient soils.

Sorptive removal of selenates and selenites using Douglas fir biochar/ metal oxide/ hydroxide nanocomposites

ACS Fall 2021

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