With reference to intoxications, list the relevant physical features of hemodialysis and hemoperfusion filters which make them suitable for use and give one example of a toxin cleared by each of these.
The relevant physical features include
Haemodialysis : Lithium, metformin
Haemoperfusion: Phenobarbitone, theophylline
A more detailed discussion is available regarding the use of haemoperfusion and haemodialysis in toxicology There's also a revision page about haemoperfusion in a broader context. Interestingly, the college question asked for the properties of filters which make them suitable for use, rather than the properties of the drugs (which is what the college answer consists of).
If were to actually answer the question, it would look something like this:
Nenov, Vesselin D., et al. "Current applications of plasmapheresis in clinical toxicology." Nephrology dialysis transplantation 18.suppl 5 (2003): v56-v58.
Holubek, William J., et al. "Use of hemodialysis and hemoperfusion in poisoned patients." Kidney international 74.10 (2008): 1327-1334.
Ghannoum, Marc, et al. "Hemoperfusion for the treatment of poisoning: technology, determinants of poison clearance, and application in clinical practice." Seminars in dialysis. Vol. 27. No. 4. 2014.
Ghannoum, Marc, et al. "Blood purification in toxicology: nephrology’s ugly duckling." Advances in chronic kidney disease 18.3 (2011): 160-166.
Takki, S., et al. "Pharmacokinetic evaluation of hemodialysis in acute drug overdose." Journal of pharmacokinetics and biopharmaceutics 6.5 (1978): 427-442.