Synthesis and Characterization of Novel Poly (Acrylic Acid/Sodium Alginate/Sodium Humate) Superabsorbent Hydrogels. Part II: The Effect of SH Variation on Cu2+, Pb2+, Fe2+ Metal Ions, MB, CV Dye Adsorption Study

A novel superabsorbent hydrogel (SAHs) composed of (acrylic acid, sodium alginate and sodium humate) (AAc/NaAlg/SH) SAHs were tested as adsorbent for metal ions Cu2+, Pb2+, and Fe2+ ions as well as MB and CV dyes. The influence of SH concentration varies from 6.97, 8.04, 9.09, 10.11% and 11 wt% were designated as S-1, S-2, S-3, S-4, S-5, respectively. The synthesized superabsorbent hydrogel were used for the adsorption of Cu2+, Pb2+, Fe2+ and MB and CV dyes from their aqueous solutions. The binding capacity for Cu2+, Pb2+, Fe2+ ions were 311 mg/gm/L at 850 mg/L, 209 mg/gm/L at 850 mg/L and 197 mg/gm/L at 850 mg/L for initial ion concentration respectively and MB and CV dyes molecules were 323 mg/gm/L at 360 mg/L, 289 mg/gm/L at 360 mg/L for initial molecule concentration per gram of AAc/NaAlg/SH containing 9.09 wt% SH content. The adsorption data obeyed Langmuir sorption isotherms.