Figure 2 shows the EDS spectrum of the outer surface of the KNiHCF-loaded PP fiber. The peaks corresponding to C, N, O, K, Fe, and Ni in the EDS spectrum confirm the presence of KNiHCF phase in the synthesized nanocomposite fabric. According to the results presented in Table 1, the chemical formula of KNiHCF is close to K2Ni[Fe(CN)6]. Figure 2 EDS spectrum of the surface part of the KNiHCF-loaded
PP fiber. Table 1 Results of the EDS analysis Pritelivir of the outer surface of the KNiHCF-loaded PP fabric Element Weight percent Atomic percent C K 34.23 46.01 N K 28.90 33.31 O K 12.10 12.22 K K 11.29 4.66 Fe K 6.60 1.91 Ni K 6.88 1.89 Total 100.00 The X-ray diffractograms of the original PP fabric (1) and the synthesized KNiHCF-loaded PP fabric (2) are depicted in Figure 3. The well-defined peaks on the nanocomposite’s diffractogram indicate the crystalline structure of the KNiHCF nanoparticles. Main diffraction peaks at 2θ values of 17.5°, 25.1°, 30.6°, 35.6°, 40.4°, and 44.5° are attributed to the Miller indexes of (200), (220), (222), (400), (420), and (422) of the diffraction planes, respectively, indicating the crystalline face-centered cubic structure of the KNiHCF nanoparticles, which match well with those reported
for K2Ni[Fe(CN)6] (JCPDS Card No. 20-0915). The calculated lattice parameter a is 10.06 ± 0.04 Å, and it is agreed well with those reported previously . Figure 3 X-ray diffractograms of the original PP fabric (1) and synthesized nanocomposite KNiHCF-loaded PP fabric (2). Figure 4 shows PD98059 molecular weight the FT-IR-ATR spectra of the PP (1), PP-g-PAA (2), and KNiHCF-loaded PP fabrics (3). The sharp and strong absorption peak in spectrum 3 at 2,090 cm−1 corresponds to the stretching vibration of the C ≡ N group. Furthermore, the weak peaks
(3,420 and 3,265 cm−1) in the broad region of 3,000 to 3,650 cm−1 are related to the stretching Orotidine 5′-phosphate decarboxylase vibration of interstitial water. Figure 4 FT-IR-ATR spectra of PP (1), PP-g-PAA (2), and KNiHCF-loaded PP fabrics (3). Cesium adsorption studies The adsorption of cesium ions on potassium nickel hexacyanoferrate proceeds via stoichiometric ion exchange between the potassium and cesium ions. To investigate the efficiency of the synthesized nanocomposite KNiHCF-loaded PP fabric, the effect of contact time, pH, and sodium ion concentration on cesium ion adsorption was investigated in detail. Effect of contact time on cesium ion adsorption Figure 5 shows the effect of contact time on the amount of Cs ions adsorbed by the synthesized nanocomposite adsorbent. It can be seen that cesium adsorption is a rapid process; the major fraction (>95%) of the cesium ions presented in the solution was adsorbed within the first 30 min. The equilibrium amount of Cs adsorbed is 78 mg/g. Figure 5 Effect of contact time on the amount of Cs ions adsorbed by the KNiHCF-loaded PP fabric. Initial cesium concentration = 780 mg/l; pH ~ 9.