Wyniki wyszukiwania - Biblioteka Nauki

1

The application of structural foam membranes in heavy metal ion removal from drinking water

100%

Nowak U. , Kamiński W. , Albińska J. , Jaros K.

Environment Protection Engineering

|

2005

|

tom Vol. 31, nr 3-4

99-108

EN

Heavy metals directly influence every living organism and are one of the most dangerous water pollutants. Therefore, even a very low concentration of heavy metals, of the ppm order of magnitude, can be dangerous. The standard methods of heavy metal ion removal have not always allowed us to remove these ions from drinking water completely. In search of a new method, the application of structural polymer membrane to heavy metal ion removal from drinking water is presented. To prepare this membrane in the form of porous structures, a natural polymer - chitosan - was used. It was chosen because of its complexing properties determined by the location of hydroxyl and amino groups. The structural membrane was used as packing in the adsorption column, where heavy metal ions were removed. Different heavy metal ions were examined both separately and in ion mixtures. Additionally, various operating conditions were studied during the experiments.

2

Poly(2-acrylamido-2-methyl-1-propane sulfonic acid-co-1-vinyl-2-pyrrolidone) Hydrogel and its use in the Removal of Cd(II), Pb(II) and Cu(II)

100%

Çavuş S. , Çakal E.

Acta Physica Polonica A

|

2017

|

tom 132

|

nr 3

505-508

EN

Poly(2-acrylamido-2-methyl-1-propanesulfonic acid-co-1-vinyl-2-pyrrolidone), P(AMPS-co-VP), hydrogel was prepared by free radical cross-linking polymerization method. Prepared hydrogel was used in the competitive removal of Cd(II), Pb(II) and Cu(II) ions from aqueous solution. The characterization of P(AMPS-co-VP) before and after sorption was carried out by the Fourier transform infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. Atomic absorption spectrometer was used to found the concentration of metal ions in the aqueous solution. The selectivity of P(AMPS-co-VP) was as follows: Cd(II)>Pb(II)>Cu(II). Kinetic study showed that competitive removal of heavy metal ions on poly(AMPS-co-VP) was in accordance with a pseudo-second-order model.

3

Application of genetic algorithms to determine heavy metal ions sorption dynamics on clinoptilolite bed

100%

Tomczak E. , Kamiński W.

Chemical and Process Engineering

|

2012

|

tom 33

|

nr 1

103-116

EN

In the last decade a growing interest was observed in low-cost adsorbents for heavy metal ions. Clinoptilolite is a mineral sorbent extracted in Poland that is used to remove heavy metal ions from diluted solutions. The experiments in this study were carried out in a laboratory column for multicomponent water solutions of heavy metal ions, i.e. Cu(II), Zn(II) and Ni(II). A mathematical model to calculate the metals' concentration of water solution at the column outlet and the concentration of adsorbed substances in the adsorbent was proposed. It enables determination of breakthrough curves for different process conditions and column dimensions. The model of process dynamics in the column took into account the specificity of sorption described by the Elovich equation (for chemical sorption and ion exchange). Identification of the column dynamics consisted in finding model coefficients β, KE and Deff and comparing the calculated values with experimental data. Searching for coefficients which identify the column operation can involve the use of optimisation methods to find the area of feasible solutions in order to obtain a global extremum. For that purpose our own procedure of genetic algorithm is applied in the study.

4

Comparative assessment of Al2O3 modified biomasses from agricultural residues for nickel and cadmium removal

88%

Herrera-Barros A. , Tejada-Tovar C. , Gonzalez-Delgado A. D.

Journal of Water and Land Development

|

2021

|

tom no. 49

29--34

EN

The biodiversity of aqueous environments has been affected due to the disposal of wastewater highly contaminated with heavy metal ions, causing much damage to ecosystems. These pollutants are very toxic and bioaccumulate in living organisms. This work attempts to evaluate the adsorption of nickel ad cadmium ions using three biomasses from agricultural residues (corn cob – CC, orange peel – OP, and oil palm bagasse – PB) modified with alumina nanoparticles. The biomasses were characterized via compositional analysis and a point of zero charges to quantify the presence of lignin, cellulose, hemicellulose, and the feasible pH, taking advantage of the biomass charge. After modification with Al2O3 nanoparticles. The resulting adsorbents were characterized via FT-IR analysis to identify the functional groups that most contributed to the adsorption performance. Furthermore, the influence of Al2O3 nanoparticles was analysed on the adsorption capacities of the evaluated biomasses using batch systems at a temperature of 25°C and pH 6. All biomasses displayed a high content of cellulose, estimating a weight percentage of about 19.9%, 14.3%, and 13.1% for PB, OP, and CC samples, respectively. The FT-IR spectrum confirmed hydroxyl and carboxyl functional groups, which contribute to enhancing the adsorption capacities of the modified biomasses. Functional adsorption capacity was observed for all biomasses after modification with Al2O3 nanoparticles, achieving at pH 6.0 a cadmium removal from 92% (CC-Al2O3 and PB-Al2O3) up to 95.8±0.3% (OP-Al2O3). In nickel ions, it was estimated a broader adsorption capacity at pH 6.0 of about 86±0.4% after using the CC-Al2O3 sample, 88±0.1% for the PB-Al2O3 adsorbent, and 98±0.2% for the OP-Al2O3 sample, confirming the suitability of these Al2O3-modified biomasses for the removal of heavy metal ions.

5

Application of genetic algorithms to determine heavy metal ions sorption dynamics on clinoptilolite bed

88%

Tomczak E. , Kamiński W.

Chemical and Process Engineering

|

2012

|

nr 1

6

Modification of industrial divinyl rubber by oxidative chlorophosphorylation and assess-ment of metal ion removal efficiency of obtained polymer sorbent

88%

Akhmedov V. M. , Alfadul S. , Maharramov A. M. , Azizov A. A. , Alosmanov R. M. , Buniyad-Zadeh I. A.

Polish Journal of Chemical Technology

|

2015

|

tom Vol. 17, nr 2

112--118

EN

The main goal of this study was the preparation of materials containing phosphoric functionalities on the base of industrial polymer - divinyl rubber and the assessment of their removal efficiency of heavy metals from aqueous solutions. The new method concerns the oxidative chlorophosphorylation of divinyl rubber by PCl3 with the following modification of obtained inter-mediates to create -PO(OH)2, -OPO(OH)2&enspgroups in the polymer chain. The obtained modified polymers get some new properties such as complex formation and capability for ion exchange. The nature and distribution of phosphoric functionalities in the polymer were studied by the methods of NMRand FTIR- spectroscopy, thermal analysis and scanning electron microscopy. The sorption properties of synthesized polymers towards some cations (Cu+2, Ni+2, Co+2 and Zn+2) from water solutions have been tested. It has been shown that the metal removal efficiency of prepared material depends on pH of medium, initial concentration and type of metal ions

7

Nano sized carbonized waste biomass for heavy metal ion remediation

88%

Mahajan G. , Sud D.

Polish Journal of Chemical Technology

|

2014

|

tom 16

|

nr 4

6-13

EN

Utilization of agricultural waste material with approach to enhance the heavy metal remediation properties by carbonizing the biomass at nano size particles has been explored in present investigation from aqueous solutions. In this study the lignocellulosic, nitrogenous agricultural waste biomass Delbergia sissoo pods (DSP) has been tried for sequestering of Cd (II), Pb (II) and Ni (II) metal ions from aqueous solutions. Batch experiments were performed for removal of targeted metal ions keeping in consideration the preliminary affecting parameters such as effect of adsorption dose, pH, initial metal ion concentration, stirring speed and contact time. The sorption studies were analyzed by using, Freundlic isotherm and Langmuir isotherm models. The kinetics of the process was evaluated by pseudo pseudo-first order and pseudo second order kinetic models. Studies reveal that the equilibrium was achieved with in 30 min of the contact time at optimized parameters. Analytical studies of biosorbent were done by means of FT-IR, SEM and XRD. Desorption experiments were carried out using HCl solution with a view to regenerate the spent adsorbent and to recover the adsorbed metal ions.

8

TiO2/bone composite materials for the separation of heavy metal impurities from waste water solutions

88%

Dakroury G. , Labib S. , Abou El-Nour F. H.

Materials Science Poland

|

2012

|

tom Vol. 30, No. 3

189--196

EN

Pure bone material obtained from cow meat, as apatite-rich material, and TiO2-bone composite materials are prepared and studied to be used for heavy metal ions separation from waste water solutions. Meat wastes are chemically and thermally treated to control their microstructure in order to prepare the composite materials that fulfill all the requirements to be used as selective membranes with high performance, stability and mechanical strength. The prepared materials are analyzed using Hg-porosimetry for surface characterization, energy dispersive X-ray spectroscopy (EDAX) for elemental analysis and Fourier transform infrared spectroscopy (FTIR) for chemical composition investigation. Structural studies are performed using X-ray diffraction (XRD). Microstructural properties are studied using scanning electron microscopy (SEM) and specific surface area studies are performed using Brunauer-Emmet-Teller (BET) method. XRD studies show that multiphase structures are obtained as a result of 1h sintering at 700-1200 °C for both pure bone and TiO2-bone composite materials. The factors affecting the transport of different heavy metal ions through the selected membranes are determined from permeation flux measurements. It is found that membrane pore size, membrane surface roughness and membrane surface charge are the key parameters that control the transport or rejection of heavy metal ions through the selected membranes.

9

Nano sized carbonized waste biomass for heavy metal ion remediation

88%

Mahajan G. , Sud D.

Polish Journal of Chemical Technology

|

2014

|

tom Vol. 16, nr 4

6--13

EN

Utilization of agricultural waste material with approach to enhance the heavy metal remediation properties by carbonizing the biomass at nano size particles has been explored in present investigation from aqueous solutions. In this study the lignocellulosic, nitrogenous agricultural waste biomass Delbergia sissoo pods (DSP) has been tried for sequestering of Cd (II), Pb (II) and Ni (II) metal ions from aqueous solutions. Batch experiments were performer for removal of targeted metal ions keeping in consideration the preliminary affecting parameters such as effect of adsorption dose, pH, initial metal ion concentration, stirring speed and contact time. The sorption studies were analyzed by using, Freundlic isotherm and Langmuir isotherm models. The kinetics of the process was evaluated by pseudo pseudo-fi rst order and pseudo second order kinetic models. Studies reveal that the equilibrium was achieved with in 30 min of the contact time at optimized parameters. Analytical studies of biosorbent were done by means of FT-IR, SEM and XRD. Desorption experiments were carried out using HCl solution with a view to regenerate the spent adsorbent and to recover the adsorbed metal ions.

10

Complex Technology of Sewage Purification from Heavy-Metal Ions by Natural Adsorbents and Utilization of Sewage Sludge

88%

Zasidko I. , Polutrenko M. , Mandryk O. , Stakhmych Y. , Petroshchuk N.

Journal of Ecological Engineering

|

2019

|

tom Vol. 20, nr 5

209--216

EN

The aspects of complex technology of sewage purification and utilization of purification sludge were investigated in the article. The authors substantiated the possibility of purifying sewage from heavy-metal ions by means of zeolite and utilizing sewage sludge in bricks production. The adsorption capacity of the zeolite from Sokyrnytsia deposit was studied for cupric and manganese ions in relation to its fractional composition. The comparative effectiveness studies of heavy metals adsorption by natural zeolite and anthracite were carried out. The optimal sorption parameters of these ions were selected based on the investigation results of their adsorption dynamics in the Cu2+ and Mn2+ solutions. The prospects of sewage sludge utilization by means of its thermal pyrolysis at the temperatures of 600-700°С were studied. The modifying additive was obtained, which can be added to the ceramic mixture and increase the porosity, reduce the density and decrease the thermal conductivity of course solid bricks.

11

Modification of industrial divinyl rubber by oxidative chlorophosphorylation and assess-ment of metal ion removal efficiency of obtained polymer sorbent

88%

Akhmedov V. M. , Alfadul S. , Maharramov A. M. , Azizov A. A. , Alosmanov R. M. , Buniyad-Zadeh I. A.

Polish Journal of Chemical Technology

|

2015

|

tom 17

|

nr 2

112-118

EN

The main goal of this study was the preparation of materials containing phosphoric functionalities on the base of industrial polymer - divinyl rubber and the assessment of their removal efficiency of heavy metals from aqueous solutions. The new method concerns the oxidative chlo-rophosphorylation of divinyl rubber by PCl3 with the following modification of obtained inter-mediates to create -PO(OH)2, -OPO(OH)2 groups in the polymer chain. The obtained modified polymers get some new properties such as complex formation and capability for ion exchange. The nature and distribution of phosphoric functionalities in the polymer were studied by the methods of NMRand FTIR- spectroscopy, thermal analysis and scanning electron microscopy. The sorption properties of synthesized polymers towards some cations (Cu+2, Ni+2, Co+2 and Zn+2) from water solutions have been tested. It has been shown that the metal removal efficiency of prepared material depends on pH of medium, initial concentration and type of metal ions.

12

Application of genetic algorithms to determine heavy metal ions sorption dynamics on clinoptilolite bed

75%

Tomczak E. T. , Kamiński W. L.

Chemical and Process Engineering

|

2012

|

tom Vol. 33, nr 1

103-116

EN

In the last decade a growing interest was observed in low-cost adsorbents for heavy metal ions. Clinoptilolite is a mineral sorbent extracted in Poland that is used to remove heavy metal ions from diluted solutions. The experiments in this study were carried out in a laboratory column for multicomponent water solutions of heavy metal ions, i.e. Cu(II), Zn(II) and Ni(II). A mathematical model to calculate the metals' concentration of water solution at the column outlet and the concentration of adsorbed substances in the adsorbent was proposed. It enables determination of breakthrough curves for different process conditions and column dimensions. The model of process dynamics in the column took into account the specificity of sorption described by the Elovich equation (for chemical sorption and ion exchange). Identification of the column dynamics consisted in finding model coefficients [beta], KE and Deff and comparing the calculated values with experimental data. Searching for coefficients which identify the column operation can involve the use of optimisation methods to find the area of feasible solutions in order to obtain a global extremum. For that purpose our own procedure of genetic algorithm is applied in the study.

13

Comparative assessment of Al2O3-modified biomasses from agricultural residues for nickel and cadmium removal

75%

Herrera-Barros A. , Tejada-Tovar C. , Gonzalez-Delgado A. D. , Herrera-Barros A. , Tejada-Tovar C. , Gonzalez-Delgado A. D.

Journal of Water and Land Development

|

2021

14

Zastosowanie wypełnienia chitozanowego w kolumnie do sorpcji jonów Cu(II), Ni(II) i Zn(II)

75%

Tomczak E. , Szczerkowska D. , Manios M.

Proceedings of ECOpole

|

2007

|

tom Vol. 1, No. 1/2

265--270

PL

Badano proces adsorpcji na złożu z wytworzonych laboratoryjnie kulek chitozanowych modyfikowanych alkoholem poliwinylowym (PVA) i nicsieciowanych. Badania prowadzono w kolumnie wypełnionej kulkami o średnicy ok. ɸ = 3 mm dla różnych stężeń początkowych jonów w roztworach wodnych: miedzi(II) (CuS04•5H20). niklu(II) (NiSO4•6H20) oraz cynku(ll) (ZnS04•7H20) Analizowano kinetykę sorpcji jonów występujących pojedynczo w roztworze. Dodatkowo określano wpływ stężenia początkowego, objętościowego natężenia przepływu i temperatury. Do opisu sorpcji jonów zastosowano równanie pseudo drugiego rzędu.

EN

Heavy metals are specially dangerous for health, so it is important to remove them from water solutions. The process of adsorption in time-variable conditions in a column packed with chitosan beads modified with polyvinyl alcohol was analysed. The beads were not cross-linked. Experiments were carried out in the column filled with chitosan beads of diameter ɸ = 3 mm and at different initial concentrations of ions in water solutions of Cu(II). Nu9II) and Zn(II). Sorption efficiency of single ions was analysed. Additionally, the influence of initial concentration, flow rate and temperature was determined. A pseudo-second order equation was used in the description of ion sorption.

15

Nowa koncepcja oceny narażenia pacjentów leczonych ortodontycznie na toksyczne metale

75%

Mikulewicz M. , Chojnacka K. , Janeczek M. , Zielińska A. , Wołowiec P. , Górecki H.

Przemysł Chemiczny

|

2011

|

tom T. 90, nr 5

923-926

16

Zastosowanie popiołów lotnych i zeolitów modyfikowanych chitozanem do usuwania jonów metali ciężkich

75%

Kołodyńska D. , Gęca M. , Franus M. , Franus W.

Przemysł Chemiczny

|

2017

|

tom T. 96, nr 1

124--131

PL

Zeolity modyfikowane za pomocą chitozanu zastosowano do usuwania jonów Cu(II). Omówiono wpływ czasu kontaktu faz, stężenia, pH i wielkości próbki, a także rodzaju zeolitu na efektywność procesu sorpcji. Jak wykazano zastosowanie popiołów lotnych w syntezie zeolitów i wykorzystanie zeolitów syntetycznych w oczyszczaniu ścieków ma uzasadnienie ekonomiczne oraz duże znaczenie dla ochrony środowiska.

EN

Five fly ashes and 4 zeolites optionally modified with chitosan were used for removing Cu(II) ions by sorption from their aq. solns. at pH 3-5. The modification resulted in improving the sorption capacity of the sorbents.

17

Application of chitosan column packing for sorption of Cu(II), Ni(II) AND Zn(II) ions

75%

Tomczak E. , Szczerkowska D. , Manios M.

Ecological Chemistry and Engineering. A

|

2008

|

tom Vol. 15, nr 8

751-759

EN

Heavy metals are especially dangerous for health, so it is important to remove item from water solutions. The process of adsorption in time-variable conditions in a column packed with chitosan beads modified with polyvinyl alcohol was analyzed in this study. The beads were not cross-linked. Experiments were carried out in the column filled with chitosan beads of diameter fi = 3 mm and at different initial concentrations of Cu(II), Ni(II) and Zn(II) ions in water solutions. Sorption efficiency of single ions was analyzed. Additionally, the influence of initial concentration, flow rate and temperature was determined. A pseudo-second order equation was used in the description of ion sorption.

PL

Rozpatrywano proces adsorpcji prowadzony w warunkach zmiennych w czasie na złożu z wytworzonych laboratoryjnie kulek chitozanowych modyfikowanych alkoholem poliwinylowym (PV A) i niesieciowanych. Badania prowadzono w kolumnie wypełnionej kulkami o średnicy ok. fi= 3 mm dla różnych stężeń początkowych jonów w roztworach wodnych: miedzi(II) (CuS04 . 5H2O), niklu(II) (NiSO4 . 6H2O) oraz cynku(II) (ZnSO4 . 7H2O). Analizowano kinetykę sorpcji pojedynczych jonów, występujących w trójskładnikowym roztworze. Dodatkowo określano wpływ stężenia początkowego, objętościowego natężenia przepływu i temperatury. Do opisu sorpcji jonów zastosowano równanie rzędu pseudodrugiego.

18

Zastosowanie pochodnych ułamkowych do matematycznego opisu kinetyki sorpcji dla układu sorbent roślinny - jony metali ciężkich

75%

Tomczak E. , Kamiński W. , Szczerkowska D.

Proceedings of ECOpole

|

2013

|

tom Vol. 7, No. 1

267--272

PL

W pracy wykorzystano łuskę gryki do procesu sorpcji jonów metali ciężkich Cu(II), Ni(II), Zn(II), Co(II) i Cd(II) z roztworów wodnych. Wyznaczone zostały maksymalne pojemności sorpcyjne oraz stałe kinetyczne i równowagowe. Obliczone wartości pozwoliły na zastosowanie równań różniczkowych ułamkowych do opisu kinetyki sorpcji oraz uzyskania uogólnionego równania kinetyki sorpcji. Opracowanie wyników według tej koncepcji wymaga napisania procedury obliczeniowej wykorzystującej funkcje gamma oraz szeregi nieskończone. Równania kinetyki z wykorzystaniem pochodnych ułamkowych są równaniami o dwóch parametrach. Są to ułamek pochodnej i stała kinetyczna zależne od analizowanego układu sorbent - adsorbat.

EN

Buckwheat husk for sorption of heavy metal ions Cu(II), Ni(II), Zn(II), Co(II) and Cd(II) from aqueous solutions was presented in the paper. The maximum sorption capacity and kinetics and equilibrium constants were determined. Calculated values were used to describe sorption kinetics by means of fractional derivatives. The calculations were carried out using gamma functions and the infinite series. Two parameters equation was obtained. These parameters are a fraction of a derivative and a kinetics constant depend on the analyzed system.

19

Kinetic study of oil-containing wastewater treatment with the use of natural sorbents

75%

Tleuova S. T. , Userbayeva B. A. , Tleuov A. S. , Yeskendirova M. M. , Yakubova R. R. , Kerimbayeva K. Z. , Tleuova S. T. , Userbayeva B. A. , Tleuov A. S. , Yeskendirova M. M. , Yakubova R. R. , Kerimbayeva K. Z.

|

20

Kinetic study of oil-containing wastewater treatment with the use of natural sorbents

75%

Tleuova S. T. , Userbayeva B. A. , Tleuov A. S. , Yeskendirova M. M. , Yakubova R. R. , Kerimbayeva K. Z.

Journal of Water and Land Development

|

2021

|

tom no. 49

252--258

EN

The study has investigated the technical characteristics of a number of sorption materials (natural mineral) and the possibility of their use for the purification of surface and wastewater from oil and oil products. At the first step, regularities of the process of purification of oily waters have been established taking into account the processes of filtration and sorption. After that, the sorption capacity of the sorbents has been estimated, and the factors influencing it analysed. As a final step, the optimal conditions for the sorption process have been selected depending on the conditions and nature of purification. Results indicated that the maximum purification degree has been reached at the concentration of 500 mg∙dm–3 and temperature of 20°С.