“…The former group includes PEGnatural polymers, 15,16 PEG-acrylic polymers, 17 PEG-porous carbon materials (expanded graphite, activated carbon), [18][19][20] and PEG-hybrid organic systems. 21 The latter group is composed of PEG segments combining with different inorganic matter, such as silica, 3,4,7-9 montmorillonite, 22,23 diatomite, [24][25][26] gypsum and clays.…”