Here are some studies that I have picked that are dealing with PRB's in Batch and Column Adsorption studies. Key factor in the equilibrium studies is the adsorption capacity which is determined by varying some parameters such as pH, adsorbent dosage, contact time, initial adsorbate concentration and temperature. Read more along those lines and I hope these articles will guide. There is many more of them

1. https://doi.org/10.3390/ ijerph19052597

2. https://doi.org/10.1007/s40899-016-0050-y

3. http://dx.doi.org/10.1016/j.jconhyd.2014.09.003

4. doi: 10.3390/geosciences10020059