Prussian Blue Analogues of A₂[Fe(CN)₆] (A: Cu²⁺, Co²⁺, and Ni²⁺) and Their Composition-Dependent Sorption Performances towards Cs⁺, Sr²⁺, and Co²⁺

Table 1

Comparison of the adsorption capacity of Cs⁺, Sr²⁺, and Co²⁺ ions on different adsorbent materials.

Adsorbent	pH	Maximum adsorption capacity; (mg g^−1)	References
Cs^+ ion
Copper hexacyanoferrate (CuHCF)	7.0	155.60	This research
Cobalt hexacyanoferrate (CoHCF)	7.0	154.46	This research
Nickle hexacyanoferrate (NiHCF)	7.0	120.31	This research
Copper ferrocyanide functionalized mesoporous silica	7.7	17.1	[37]
Zeolite A	6.0	208.7	[38]
Magnetic PB/GO	7.0	55.6	[39]
Montmorillonite-iron oxide composite	6.5	52.6	[25]
Conjugate adsorbent	7.0	77.7	[40]
Ammonium molybdophosphate-polyacrylonitrile	6.5	81.3	[41]
Cs^+-imprinted polymer nanoparticle	9.0	50.0	[42]
Poly(AAc-co-B18C6Am) hydrogels	6.0	74.6	[6]
Prussian blue/Fe3O4	7.0	280.82	[43]
CuHCF-cellulose hydrogel	7.0	309	[44]
CuHCF/MWCNT	7.0	310	[44]
MOF/KNiFC	5.0	153	[45]
Sr^2+ ion
Copper hexacyanoferrate(CuHCF)	7.0	59.95	This research
Cobalt hexacyanoferrate(CoHCF)	7.0	32.73	This research
Nickle hexacyanoferrate (NiHCF)	7.0	29.17	This research
Amorphous zirconium phosphates	11.4	134.2	[46]
Zr-MOF	7.0	7.548	[47]
Zirconium phosphate on active carbon	6.0	2.9	[22]
ZrO2-TiO2	9.0	28.01	[48]
Zirconium phosphate	1.0	34	[49]
Fower-like α-ZrP	4.0	293.43	[50]
Titanate nanofibers	7.0	55.2	[51]
PAN-zeolite	7.0	44.43	[52]
Carboxymethylated cellulose	4.0	108.7	[53]
Graphene oxide	6.5	23.83	[54]
ZrP-SO3H	4.0	183.21	[55]
Nb-doped WO3	7.0	54.39	[54]
Co^2+ion
Copper hexacyanoferrate (CuHCF)	7.0	62.08	This research
Nickle hexacyanoferrate (NiHCF)	7.0	32.34	This research
MWCNT/IO		10.61	[56]
Silica SBA-15		181.67	[57]
SiO2/Nb2O5/ZnO		0.518	[58]
Ordered micro- and mesoporous/SiO2		8.43	[59]
Magnetite-based nanocomposites		43.292	[60]
GO-NH2		116.35	[61]