Exploring the Potential of Biochar Activated with Phosphoric Acid towards Hexavalent Chromium Remova

For the adsorption of hexavalent chromium (Cr (VI)) from the simulated solution, the biochar extracted from the dreadful weed water hyacinth (Eichhornia crassipes) was triggered with phosphoric acid. To research the surface properties of the biochar, the characterization of biochar (Zeta potential, basic surface region, Scanning Electron Microscope analysis) was performed. Compared to the pristine biochar, the adjusted biochar (379 m2g-1) observed a 49.80 percent greater surface area than the pristine biochar (253 m2g-1). The modified biochar has a zeta potential of 4.2 mV and the pristine biochar is -13.9 mV. The sorption of negatively charged Cr (VI) ions is strengthened by the positively charged modified surface. The pH and concentration impact analysis showed that maximum sorption occurred at pH 2 and the increasing concentration trend resulted in a decrease in sorption. The isotherm analysis was well supported by the monolayer adsorption concept of the Langmuir isotherm (R2 value=0.976). Maximum adsorption ability was reported for modified biochar phosphoric acid (50.0 mg g-1) compared to pristine biochar) (35.7 mg g-1). In describing the rate of reaction, pseudo second order kinetics (R2 value=0.998) sounds fine. The results indicate the usefulness of acid-modified Eichhornia crassipes for aqueous medium removal of heavy metals.

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