The summary of different modified attapulgite.

Modification methods		Modifiers	Targets	Applications	Ref.
Organic modification	Grafting	PAM, OTAC, OTAB, DDAB, CA	To change the surface functional groups of ATP	Adsorption of dyes, phenol and tannin	65, 68, 73, 74 and 78
	Silane-coupling	APTES	To change the hydrophobicity of ATP surface	Adsorption of oil pollutants	75 and 79
	Coating	Chitosan, polyaniline, polyurethane	To change surface structure of ATP	Adsorption of dyes, organic pesticides, fats, and other toxic substances in wastewater	80–84
Modification ATP by carbon-based materials	3D-C	Carbon, biochar	To enhance specific surface area of ATP	Adsorption of dyes and antibiotics	95–97
	2D-C	GO	To enhance specific surface area and conductivity of ATP	Removal of dyes	98–103
		g-C3N4	To enhance specific surface area and photocatalysis ability of ATP	Removal of dyes	104–106
Loading metal or metal oxides on ATP	Fe	nZVI	To improve reducibility and high reaction activity of ATP	Adsorption and catalytic reduction of dyes and organic pesticides	107–109
	Fe oxides	Fe2O3, Fe3O4	To improve catalytic ability of ATP	Catalytic reduction of dyes and other organics	110–113
	Multi-metal oxides	CuO–Fe2O3, CeO2–Fe2O3, BiOCl–TiO2	To achieve an effect of synergistic oxidation	Catalytic reduction of dyes and antibiotics	114–117
Compound modification of attapulgite		Organics and metals or metal oxides	To achieve multi functions of ATP simultaneously	Catalytic reduction of dyes, antibiotics and HA–Na	122–126