Performance of Fe-Loaded Chitosan Carbonized Rice Husk Beads (Fe-CCRB) for Continuous Adsorption of Metal Ions from Industrial Effluents

摘要

The present investigation elucidates the removal of heavy metal ions using Fe-loaded chitosan carbonized rice husk beads-Fe-CCRB from synthetic and industrial effluent in a fixed bed column. The surface properties of Fe-CCRB were characterized by Brauner Emmet and Teller (BET) analyzer, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDAX) and Fourier transform infrared spec-troscopy (FTIR). The effects of process parameters such as flow rate, bed height and initial Cr (Ⅵ) concentration were studied to determine the break through time. The experimental data fitted well with Thomas model and Yoon Nelson model. The break through curve of Adam Bohart model fitted with initial part of the breakthrough curve of experimental data. The BDST model described the adsorption capacity of the bed per unit bed volume N_o increased with increase in C_t/C_o. Regeneration studies were attempted to check the stability and activity of the adsorbent. The Fe-CCRB adsorbent was used to treat the effluents and it was found to be more efficient in adsorption of anionic pollutant Cr (Ⅵ) ions when compared to cationic pollutant Ni (Ⅱ) and Zn (Ⅱ) with the maximum percentage removal of Cr(Ⅵ), Ni(Ⅱ), and Zn(Ⅱ) was 82.4, 63.1, and 77.2%, respectively.