“…The PEI/SiO 2 composite material was successfully fabricated to adsorb 2,4,6-trinitrotoluene through hydrogen bonding between PEI and 2,4,6-trinitrotoluene [25]. Although there are many cases about the efficient adsorption capacity of PEI [20][21][22][23], to the best of our knowledge, no studies have investigated the use of PEI as a desired desorbent for the removal of adsorbed compounds from materials. There is apparently no good reason to disregard this promising desorbent.…”