19, 12.45, and 18.71 mg g−1 at 50, 100, and 150 mg L−1, respectively. Also, the analysis of adsorption kinetic is given in the supporting information (Additional file 1: Figure S4).

Figure 5 An environmental feasibility of the sample for the removal of Pb(II) metals. (a) Percentage removal and equilibrium adsorption capacity of Pb(II) onto the ZOCF adsorbent as a function of contact time at the initial Pb(II) ion concentrations of 50, 100, and 150 mg L−1, at pH 5.5, in the contact time range of 10 to 180 min at room temperature (25 ± 1°C) with a fixed adsorbent dose, and (b) the equilibrium adsorption capacity of Pb(II) ions onto the Alvocidib ZOCF adsorbent as a function of equilibrium Pb(II) ion concentration with nonlinear curve fits of the Langmuir, Freundlich, and Dubinin-Radushkevich isotherm models. In order to determine the adsorption capacity of the ZOCF adsorbent, the adsorption amount of Pb(II) was measured in the Pb(II) ion concentration range of 10 to 500 mg L−1 at room temperature, keeping other parameters as constant, and then the maximum adsorption capacity was calculated by using the Langmuir isotherm model which is used successfully in many monolayer adsorption processes and can be given by q e = (q m K L C e ) / (1 + K L C e ) [26], where q m is the maximum adsorption capacity (mg

g−1) of Pb(II) ions, and K L is the Langmuir adsorption constant (L mg−1) related to the free energy of adsorption. Figure 5b shows the equilibrium adsorption capacity of Pb(II) ions onto www.selleckchem.com/products/pci-32765.html Erlotinib cost the ZOCF adsorbent as a function of equilibrium Pb(II) ion concentration with nonlinear

curve fits of the Langmuir isotherm model. Additionally, the well-known Freundlich and Dubinin-Radushkevich isotherm models were also compared, and the details are described in the supporting information (Additional file 1: Figure S4). The values of q m and K L were 245.07 mg g−1 and 0.01181 L mg−1. The Langmuir fit curves agreed with the experimental data. Interestingly, the ZOCF adsorbent selleck chemical exhibited a high q m as compared with those reported in host-supported NMOs, which are summarized in Table 1. These results suggest that the ZOCF is a good adsorbent for the removal of Pb(II) and an alternative for the treatment of wastewaters containing heavy metals. Table 1 Comparison of some host-supported NMOs for heavy metal removal NMOs Host substrate Pb(II) Zn(II) Cd(II) Hg(II) Reference (mg g−1) (mg g−1) (mg g−1) MnO2 Crushed brick 0.030 mg g−1 – - – [27] MnO2 Sand 0.029 mg g−1 – - – [27] MnO2 Zeolite 0.35 mmol g−1 – - – [28] – Diatomite 99.0 mg g−1 – - – [29] ZnO Activated carbon 100% – - – [30] CaTiO2 Al2O3 124 mg g−1 13.86 8.58 – [31] Fe2O3 – 218.53 mg g−1 – 212 344.8 [32] Goethite Sand 0.702 mg g−1 – - – [33] – Sand 1.21 mg g−1 – - – [34] Fe2O3 Municipal sewage sludge 42.4 mg g−1 – - – [35] Fe3O4 – - – - 227 [36] ZnO – - 357 384 714 [16] Fe2O3 – 176.33 mg g−1 16.97 – 303.0 [37] ZnO Carbon fiber 245.