Adsorption of Cu(II), Pb(II), Co(II), Ni(II), and Cd(II) from aqueous solution by poly(aryl ether ketone) containing pendant carboxyl groups (PEK-L): Equilibrium, kinetics, and thermodynamics

Comparative study of Hg(II) adsorption by thiol- and hydroxyl-containing bifunctional montmorillonite and vermiculite

“…10) are given in Table 4 The correlation coefficient (R 2 ) is found to be 0.960, 0.933, 0.984 and 0.946 for Vm, BAL-Vm, Mt and BAL-Mt, respectively, demonstrating a good fitness with Langmuir model for the adsorption process, which takes place at specific homogeneous reactive sites on the surface of these samples and is probably a monolayer incorporation [43]. Besides, the value of q m for BAL-Vm and BAL-Mt is 9.632 mg g −1 and 3.208 mg g −1 , corresponding to 5-fold and 2-fold enhancement of the maximum adsorption capacity compared with Vm and Mt, respectively, implying that organo-functionalization endows BALVm and BAL-Mt with strong affinity to Hg(II) and a promising application for wastewater treatment.…”

A novel electrospun PVA/ZnO nanofiber adsorbent for U(VI), Cu(II) and Ni(II) removal from aqueous solution

“…The removal of water molecules from hydrated metal ions is an endothermic process and according to the DH˚value of the overall sorption process, the endothermicity of the desolvation process significantly exceeded the enthalpy of sorption. On the other hand, the positive values of DH˚indicate the endothermic behavior of the adsorption reaction of metal ions and suggest that a large amount of heat is consumed to transfer the hydrated metal ions from aqueous into the solid phase [37]. As suggested by Nunes and Airoldi [52], the transition hydrated metal ions must give up a larger share of their hydration water before they can enter the smaller cavities.…”

“…Therefore, the potential of sorption for metal ions on the nanofiber adsorbent is in the order of U(VI) > Cu(II) > Ni(II). The capacity of sorption of metal ions on the nanofiber adsorbent is also compared with the capacities of other adsorbents reported in the literature [30,[33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48], the list of which is presented in Table 4. The Freundlich isotherm expresses sorption at multilayer and on energetically heterogeneous surface.…”

Adsorption of heavy metals from industrial wastewater by using polyacrylic acid hydrogel

“…(2015) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] www.deswater.com doi: 10.1080/19443994.2015.1030453 synthetic zeolites, hydrogels, and nanoparticles [7][8][9][10]. Table 1 shows the advantages and disadvantages of various processes used for the removal of heavy metals from wastewater [11].…”