New;y fabricated two adsorbents are here to remove contaminants. (data is given as a picture of Excel.)

1. Which is the best kinetic model? (Pseudo first order, Pseudo second order, three stages, intrapore diffusion) 2. Does intraparticle diffusion mean a rate-limiting step? why?

\begin{tabular}{|c|c|c|r|} \hline Time (min) & C/C0 & Time (min) & \multicolumn{1}{l|}{ C/C0 } \\ \hline 0 & 1.000 & 0 & 1 \\ \hline 1 & 0.599 & 1 & 0.292066715 \\ \hline 3 & 0.439 & 3 & 0.240038944 \\ \hline 5 & 0.419 & 5 & 0.175293274 \\ \hline 10 & 0.394 & 10 & 0.125577848 \\ \hline 15 & 0.349 & 15 & 0.09204884 \\ \hline 30 & 0.305 & 30 & 0.029838003 \\ \hline 60 & 0.255 & 60 & 0.028103743 \\ \hline 90 & 0.238 & 90 & 0.026369484 \\ \hline 120 & 0.228 & 120 & 0.025791398 \\ \hline 180 & 0.186 & & \\ \hline 240 & 0.179 & & \\ \hline & & & \\ \hline CO=20mg/L & & & \\ \hline \end{tabular} mass of adsorbent =200mg/L