Removal studies of Cd(II) and explosive compounds using buffalo weed biochar-alginate beads

• Buffalo weed biochar-alginate beads(ATLB-AB) used as adsorbent for treatment of Cd(II), TNT and RDX in ground water.
• Very good sorption capacity was achieved for Cd(II), TNT and RDX with as synthesized, ATLB-AB.
• The kinetics studies reveal that the sorption process of targets were rate-limiting and intra-particle diffusion process.
• This kind of adsorbent is introduced as a low cost and environmental friendly biosorbent.
• This modified biochar beads successfully applied for continuous column studies and explained sorption mechanism well.

Synthesized Ambrosia trifida L. var. trifida biochar-alginate beads (ATLB-AB) for treatment of Cd(II),TNT and RDX. In order to check practical applicability of ATLB-AB in large scale waste water treatment, fixed-bed column studies were performed along with batch adsorption studies. The adsorption kinetics was pseudo-second-order kinetics and was well tune with Freundlich isotherm model. The column study results found to be higher breakthrough time and the adsorption efficiency at a flow rate 0.25 mL/min. Thomas model was found to be suitable to represent the kinetics of adsorption of Cd(II), TNT and RDX in a fixed bed packed column.

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