Novel alginate/polyethyleneimine hydrogel adsorbent for cascaded removal and utilization of Cu2+ and Pb2+ ions

Fabrication of Novel Bio-Adsorbent And Its Application For The Removal of Cu(II) From Aqueous Solution

“…(Fig. 3c), the XPS peak binding energies of Cu 2p1/2 and Cu 2p3/2 are 951.6-954.7 eV and 931.6-934.4 eV, respectively (Godiya et al 2019 ). In addition, the satellite peak is located at the binding energy 944.3 eV , which also indicates that Cu(II) exists on the surface of HCA hydrogel beads.…”

Phosphate-crosslinked β-cyclodextrin polymer for highly efficient removal of Pb(ii) from acidic wastewater

“…The Freundlich isotherm model assumes that the adsorbate forms a multilayer on the surface of the adsorbent due to the heterogeneous surface. 41 The non-linear Freundlich isotherm model is represented by eqn (7): (7) where K F (mg g À1 ) is the Freundlich constant related to adsorption capacity, and 1/n is the Freundlich constant related to surface heterogeneity.…”

“…[1][2][3][4] The current treatment technology of heavy metal wastewater mainly includes precipitation, electrolysis, membrane separation, solvent extraction, and adsorption. 5 In industrial production, chemical precipitation is still the most important method to treat heavy metal wastewater, especially acidic wastewater. The neutralization precipitation method precipitates heavy metals in the form of hydroxides by changing the pH value of the solution.…”

“…In contrast, the adsorption method has the advantages of easy separation, low cost, no secondary pollution, and recyclability. 6,7 Therefore, it is important to develop adsorbents that can efficiently remove heavy metals from acid wastewater.…”

Review on the Use of Heavy Metal Deposits from Water Treatment Waste towards Catalytic Chemical Syntheses

“…Godiya et al, fabricated a porous three-dimensional (3-D) sodium alginate (ALG)/polyethyleneimine (PEI)-based composite hydrogel for the absorption of Cu(II) and Pb(II) from wastewater. Later, the in situ fabricated hydrogel reduced metal ions into metal nanoparticles, and metal nanoparticle-based hydrogel systems were used in the catalytic reduction of toxic 4-nitro phenol (4-NP) in presence of sodium borohydride (NaBH 4 ) as a reducing agent [175]. Ma et al, used fly ash and sawdust for the absorption of the aqueous solution of Ni(II) ions, and the Ni(II) ion-absorbed system was used for catalytic degradation of 2-chlorophenol (2-CP) in an ozone oxidation batch reactor [176].…”