The disclosure relates to N-alkyl-D-glucamine based mac roporous polymeric cryogels with three-dimensional struc ture and with interconnected pores, which are used for sequestering and/or removing toxic contaminants, such as toxic metalloids and/or toxic heavy metals, for example from water and/or soil and the method for the preparation of said-alkyl-D-glucamine based macroporous polymeric cryogels.(21) Appl. No.: 17/626,227 (22) PCT Filed: Jul. 13, 2020