Resumo

AHMED, Nafees  e  RAHMAN, Md. Ataur. Adsorptive Removal of 2,4-Dichlorophenol from Aqueous Solution by Using Used Black Tea Leaves. J. Mex. Chem. Soc [online]. 2021, vol.65, n.2, pp.225-236.  Epub 04-Jun-2021. ISSN 1870-249X.  https://doi.org/10.29356/jmcs.v65i2.1424.

Bioadsorbents are drawing the attention of the environmental scientists in removing organic pollutants from aqueous solution because of their availability and low cost. In this research, adsorptive removal of 2,4-dichlorophenol (2,4-DCP) onto used black tea leaves (UBTLs) as well as on sodium chlorite modified used black tea leaves (SCM-UBTLs) was investigated at different conditions. The value of pH was optimized at 2. Smaller particle size (50-100 µm) of both the adsorbents showed maximum removal of 2,4-DCP. However, SCM-UBTLs exhibited comparatively higher (54%) removal of DCP than unmodified used black tea leaves (UM-UBTLs) (40%) at similar conditions (pH, particle size and dose). Equilibrium attained within three hours for both the adsorbents of smaller particle size at pH 2. Adsorption follows the Ho’s pseudo-second-order kinetics rather than Lagergren pseudo-first- order for both the adsorbents. The experimental data was justified with the FTIR spectra of adsorbed and unadsorbed surfaces.

Palavras-chave : Adsorption kinetics; 2,4-DCP; sodium chlorite; used black tea leaves; removal.