| Popis: |
The present study investigated the adsorption characteristics, diffusion, and Isotherms of modified pig Waste for removing Reactive Violet 5 (RV5). Pig wastes were subjected to chemical modification by Triton X100 (TX100) and 1% sodium dodecyl sulphate (SDS) treatment. The effect of some significant parameters such as pH, time, and dye concentration on the adsorption capacity of the studied systems was determined using standard methods. The pseudo-secondorder, intra-particle diffusion, Elovich, and power function kinetic equation models were used to examine the rate of the adsorption process; while the equilibrium data were fitted to adsorption isotherm models; Langmuir, Freundlich, Redlich-Peterson, and Sips models. The maximum RV5 removal capacity for each of the adsorbents was found to be at pH 1 and decreased with increasing pH, and equilibrium time was found to be 80mins for different adsorbent materials, and the adsorption capacity at the equilibrium time was 45%, 48%, and 70% for untreated, TX100 and SDS treated PGD. The results obtained closely fitted into the intraparticle diffusion linear kinetic model with a nonzero y-axis intercept and correlation coefficients (R2 ) values of 0.999 for the absorbents; indicative of a multipath diffusion mechanism being involved in the adsorption of RV5 by treated and untreated PGD. The adsorption of RV5 by PGD treated with SDS and TX100 strongly aligned with a linearized Freundlich Isotherm for the effect of dye concentration on adsorption capacity; with correlation coefficient (R2 ) of 0.968 and 0.937 for the PGD treated with SDS and TX100 respectively. Therefore, PGD treated with SDS may be efficiently used as an adsorbent for the removal of RV5 from aqueous solutions. The adsorption of SDS and TX100 treated PGD tightly fitted into pseudo-secondorder, power function, and Elovich non-linear kinetic models and a heterogeneous multi-path diffusion mechanism. |
