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In this study, the sorption behaviour of 1,3-benzothiazole (BT) and   2-(methylthio)benzothiazole (MTBT) was investigated on Danube geosorbent   under equilibrium and nonequilibrium conditions. All sorption isotherms   fitted well with the Freundlich model (R2=0.932-0.993). The results showed   that organic matter of the Danube geosorbent has a higher sorption affinity   for the more hydrophobic MTBT compared to BT. However, sorption-desorption   experiments showed that MTBT was more easily desorbed than BT molecules,   which indicates the importance of absorption relative to adsorption in the   overall sorption mechanism of MTBT. In general, molecules of BT and MTBT were   more easily desorbed in the lower concentration range, which resulted in an   increase in the hysteresis indices with increasing concentrations. Column   experiments revealed that retention of the investigated compounds on the   aquifer material followed the compound’s hydrophobicity. BT showed a lower   retention, in accordance with its lower sorption affinity obtained in the   static experiments, while MTBT showed a greater sorption affinity, and thus   had a longer retention time on the column. Thus during transport BT represent   greater risk for groundwaters than MTBT. These results have increased our   understanding of benzothiazoles sorption and desorption process which   represent one of the most important factors which influence the behaviour of   organic compounds in the environment

Sorption of benzothiazoles onto sandy aquifer material under equilibrium and nonequlibrium conditions