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    Removability Efficiency of Heavy Metals with Modified Humate from Aqueous Media
    (Inst Higher Education Acad Sci, 2014) Taubayeva, A. S.; Dzhusipbekov, U. Z.; Nurgalieva, G. O.; Shakirova, A. K.; Temel, H.; Pasa, S.
    The main aim of this work was to study the possibility of using amine-modified humate as a sorbent for the purification of water from heavy metal ions (Cu& Co). One of the effective methods of creating new sorbents of humic acids is chemical modification based on the high reactivity of the functional groups in the composition of humic acids. The possibility of modification of humic acid with bis(3-aminopropyl) amine was illustrated. Modification was carried out with the aim of increasing its sorption capacity. Metalhumate complexes were also obtained by an ion-exchange procedure with modified humate (Mod-Hum) by employing metal salts such as Cu(CH3COO)(2)center dot H2O, Co(CH3COO)(2)center dot 4H(2)O. Maximum sorption percentages of Mod-Hum achieved were about 99.2% for Cu (II) and 90% for Co (II). The sorption degree depending on pH changes was studied in the range of 2 to 8, the sorption ability of the sorbents was stated to increase with the increase in pH. The degree of sorption of copper (II) on Mod-Hum in the studied range of pH 5 was higher and of cobalt (II) for which the sorption is optimal at higher values (pH 7-8). It is stated that sorption degree increases with the increase in time from 15 min to 2 h. The adsorption of toxic metal ions with Mod-Hum was measured by atomic absorption spectroscopy (AAS). The experimental results on determination of the adsorption isotherm were evaluated with the Langmuir equation. It is shown that the sorbent develops a high sorption capacity in regard to ions of Cu (18.42 mg/g) and Co (16.25 mg/g). All the obtained complex compounds were analyzed and characterized by FT infrared spectroscopy (FTIR), scanning electron microscopy (SEM).
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    Removal of Pb2+, Cd2+, and Cu2+ from phosphoric acid solution using the chitosan-modified natural zeolite
    (Wiley-Blackwell, 2015) Kussainova, M. Z.; Chernyakova, R. M.; Dzhusipbekov, U. Z.; Paşa, Salih; Temel, Hamdi; 0000-0003-1243-3527; 0000-0002-4792-8821
    Sorption ability of the chitosan-modified natural zeolite for Pb2+, Cd2+, and Cu2+ cations was investigated. The influence of time and concentration of heavy metals on their sorption from concentrated (85% H3PO4) phosphoric acid was determined. At 20 and 40 min of sorption curves, there are a number of maxima probably due to desorption of cations from the sorbent into the acid. According to the results, sorption of the modified zeolite for lead cation is the least in the whole interval of time. In the case of equal concentrations of all cations (C-Pb = C-Cd = C-Cu), sorption of lead, cadmium, and copper was 94.81-95.09%, 96.55-97.50%, and 97.53-98.14%, respectively. Sorption curves in the case of equal Pb2+ and Cd2+, but higher concentrations of Cu2+, are the same for all cations. Sorption of cadmium varies from 95.48% to 97.55%. Copper and lead sorbed in a less amount, in the case of (C-Pb = C-Cd = C-Cu), their sorption in 10 min was 95.42% and 97.55%, respectively. As in the case of equal concentrations of all cations (C-Pb = C-Cd = C-Cu), the sorptions of copper, cadmium, and lead were (92.09-96.93%), (92.13-95.37%), and (91.35-94.45%), respectively, in the case of (C-Cb = C-Cu < C-Cd). Physico-chemical methods of analysis are as follows: Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray powder diffraction patterns, and Brunauer-Emmett-Teller have shown that natural zeolite is activated without destroying the structure and adsorbs lead, as well as cadmium and copper cations. (C) 2015 Curtin University of Technology and John Wiley & Sons, Ltd.