Mehmet Soner Engin

Accumulation of Heavy Metals in Water, Sediments and Wetland Plants of Kizilirmak Delta (Samsun, Turkey)

In this study, concentrations of heavy metals (Fe, Mn, Ni, Co, Zn, Cu, and Pb) were measured in water bodies including streams, bottom sediments and various wetland plants of Kızılırmak Delta. Kızılırmak Delta is one of the largest and the most important natural wetlands in Turkey and has been protected by Ramsar convention since 1993. The heavy metal concentrations in water were found lower than that of national standards for protected lakes and reserves. In bottom sediments and wetland plants, however, the accumulated amounts of different heavy metals varied in the following order: Fe>Mn>Zn>Ni>Co>Cu>Pb, and Fe>Mn>Zn>Ni>Co respectively. Heavy metal uptake of Hydrocharis morsus-ranae and Myriophyllum verticillatum plants among others were found far above the toxic levels and they might be used as bio-indicators and heavy metal accumulators in polluted natural areas.

Effect of EDTA and Tannic Acid on the Removal of Cd, Ni, Pb and Cu from Artificially Contaminated Soil by Althaea rosea Cavan

In this study an ornamental plant of Althaea rosea Cavan was investigated for its potential use in the removal of Cd, Ni, Pb and Cu from an artificially contaminated soil. Effect of two different chelating agents on the removal has also been studied by using EDTA (ethylenediaminetetracetic acid) and TA (tannic acid). Both EDTA and TA have led to higher heavy metal concentration in shoots and leaves compared to control plants. However EDTA is generally known as an effective agent in metal solubilisation of soil, in this study, TA was found more effective to induce metal accumulation in Althaea rosea Cavan under the studied conditions. In addition to this, EDTA is toxic to some species and restraining the growth of the plants. The higher BCF (Bio Concentration Factor) and TF (Translocation Factor) values obtained from stems and leaves by the effects of the chemical enhancers (EDTA and TA) show that Althaea rosea Cavan is a hyper accumulator for the studied metals and may be cultivated to clean the contaminated soils.

Preparation of calix[4]arene-embedded polysulphone membranes, and utilisation of its Cr(VI) transport efficiency

Abstract In this study, a tetramine-substituted calix[4]arene derivative, which was synthesised from calix[4]arene by treatment with dimethylamine in one step via Mannich reaction, was used to fabricate a new calix[4]arene-embedded polysulphone membrane (calix@membrane). Its structure and surface morphology were determined using thermogravimetric analysis and scanning electron microscopy, and elemental analysis techniques. Moreover, a Donnan dialysis system was employed to investigate Cr(VI) transport efficacy of calix@membrane at different pH values. Results showed that calix@membrane represented a promising transport capability for HCr2O7− due to their efficient complexation behaviour.

Synthesis and Characterization of 1-(2-Furoyl) Piperazine Calix[4]arene for the Preconcentration of Metal Ions

ABSTRACT A new 1-(2-furoyl)piperazine-appended calix[4]arene derivative 3 has been synthesized and characterized using 1H nuclear magnetic resonance (1H NMR) and elemental analysis. Its metal ion extraction capabilities toward Pb2+, Cu2+, Ni2+, Co2+, Cd2+, and Zn2+ ions have been evaluated. The results show that 1-(2-furoyl)piperazine-appended calix[4]arene derivative 3 exhibited 95% extraction recovery but also selectivity toward Cd2+ and other ions.

EDTA Supported Phytoextraction of Cd from Contaminated Soil by Four Different Ornamental Plant Species

ABSTRACT In this study, some ornamental plant species such as Althaea rosea Cavan, Lonicera japonica Thunb, Salvia virgata Jacq. (Lamiaceae), and Dahlia hybrida growing in the natural vegetation of Black Sea Region (Turkey) were investigated for their phytoextraction potential of cadmium (Cd) from artificially contaminated soil of 10, 25, 50, and 100 mg/kg concentration under pot conditions. Effect of ethylenediaminetetracetic acid (EDTA) on this removal has also been studied. To evaluate the removal efficiency of the studied plants, the bioconcentration factor (BCF) and translocation factor (TF) values were also calculated. Higher BCF and TF values obtained from stems and leaves of A. rosea Cavan, L. japonica Thunb, and S. virgata Jacq. (Lamiaceae) show that those plants might be cultivated and used as hyperaccumulators in the removal of Cd from the contaminated soils. EDTA enhanced the Cd phytoextraction in plants; however, at the same time it resulted in a slight decrease in the dry matter.

Utilization of transport efficacy of novel calix[4]arene-embedded polymer inclusion membrane towards trace metals

In this study, 25,27-bis(3-mercaptopropoxyl)-26,28-dihydroxy calix[4]arene was successfully synthesized from the reaction of calix[4]arene-dialkylbromide derivative with thiourea. The structure of 25,27-bis(3-mercaptopropoxyl)-26,28-dihydroxy calix[4]arene was fully characterized using 1HNMR, 13CNMR and elemental analysis techniques. The obtained mercapto-substituted calix[4]arene derivative was employed as an additive material along with cellulose triacetate (CTA) and 2-nitrophenyl octyl ether (o-NPOE) for the preparation of a novel polymer inclusion membrane (C@PIM). The structure and surface morphology of mercapto-substituted calix[4]arene-embedded polymer inclusion membrane was determined using thermogravimetric analysis, scanning electron microscopy and elemental analysis techniques. Donnan dialysis system was also used to assess the transport efficacy of C@PIM towards Pb(II), Zn(II), Cu(II), Ni(II), Cd(II) and Co(II) ions. The results show that new C@PIM exhibited 99% transport efficacy but also selectivity toward Ni(II) and other ions.

Preparation and Characterization of Calix[4]aren-immobilized Magnetic Microcapsule and Its Application in Heavy Metal Removal

ABSTRACT This article describes the preparation of the polysulfone microcapsule (CPM) containing both 5,11,17,23-tetrakis[(dimethylamine)methyl]-25,26,27,28-tetrahydroxy calix[4]arene and magnetic nanoparticles. The structure of CPM was characterized using Fourier transform infrared spectroscopy, transmission electron microscopy, thermo gravimetric analysis and elemental analysis techniques. Moreover, heavy metal ions adsorption capability of the porous CPM toward Pb2+, Cu2+, Co2+, Cd2+ and Zn2+ ions was investigated. The results indicate that CPM exhibited selectivity in an order for Zn2+>Cu2+>Cd2+>Pb2+>Co2+. In addition, reusability studies for CPM were evaluated, and it was found that CPM could be reused without significant loss in their adsorption capacity for five times Zn2+ adsorption–regeneration cycles.

Synthesis, characterization, biological activity, and DFT-reactivity assessment of Mn(II), Co(II), and Cu(II) complexes of a new N 2 O tridentate Schiff base

Three new homoleptic Schiff base: metal(II) complexes, bis{2-[(pyridin-2-yl) methylene-amino] naphthoxometal(II)} [M(npa)2], (M = Mn(II) (1), Co(II) (2), Cu(II) (3), npa is monoanion of 2-[(pyridin-2-yl)methyleneamino]naphthol), have been prepared and characterized by elemental analyses, FT–IR, 1H and 13C NMR, and HR-MS-TOF. Antimicrobial activity of the title compounds was tested against six standart bacteria and two standart fungi isolates by microdilution broth assay with Alamar Blue Dye. Biological activity of the complexes has been estimated by using Fukui reactivity indices and frontier molecular orbitals in the framework of conceptual density functional theory.

Evaluation of trace metals in sediment, water, and fish (Mugil cephalus) of the central Black Sea coast of Turkey

ABSTRACT In this study, concentrations of trace metals such as As, Cd, Cu, Cr, Fe, Pb, Ni, Sn, Se, and Zn were determined in sediments, water, and a kind of fish (Mugil cephalus) of the central Black Sea coasts by employing Inductively Coupled Plasma Mass Spectrometry and microwave digestion technique. Gill, muscle, liver, and other tissues were analyzed separately for each sample. The accuracy of the results were checked by using a certified reference material (DORM-4). In water samples, the metal determined at highest concentrations was Cu (1645.44 µg/L). In sediment samples, the metal determined at highest concentrations was Fe (12223.50 mg/kg). The levels of trace metals found in the different parts of the fish were: Zn in muscle tissue (30393.28 mg/kg), Sn in gill tissue (5140.08 mg/kg), and Cu in liver tissue (289.31 mg/kg). These results were also compared with various relevant guidelines and literature.