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Adsorption of Cu(II), Zn(II), Ni(II), Pb(II), and Cd(II) from aqueous solution on amberlite IR-120 synthetic resin
(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2005) Demirbaş, Ayhan; Pehlivan, Erol; Göde, Fethiye; Altun, Türkan; Arslan, Gülşin
The adsorption of copper(II), zinc(II), nickel(II), lead(II), and cadmium(II) on Amberlite IR-120 synthetic sulfonated resin has been studied at different pH and temperatures by batch process. The effects of parameters such as amount of resin, resin contact time, pH, and temperature on the ion exchange separation have been investigated. For the determination of the adsorption behavior of the resin, the adsorption isotherms of metal ions have also been studied. The concentrations of metal ions have been measured by batch techniques and with AAS analysis. Adsorption analysis results obtained at various concentrations showed that the adsorption pattern on the resin followed Freundlich isotherms. Here we report the method that is applied for the sorption/separation of some toxic metals from their solutions. (C) 2004 Elsevier Inc. All rights reserved.
Bazı polimerik sorbentlerin toksik metaller ile sorpsiyon, iyon değiştirme ve şelatlaşma özelliklerinin incelenmesi
(Selçuk Üniversitesi Fen Bilimleri Enstitüsü, 2004) Arslan, Gülşin; Pehlivan, Erol
Bu çalışmada, doğal adsorban olan Konya çevresi linyitleri (Beyşehir, Ermenek ve Ilgın), bu linyitlerden sentezlenen humik asitler ve ayrıca sentetik adsorban olan aktif karbonlar (Merck, Chemviron (AQ-30) ve Teknopark) üzerindeki ağır metal sorpsiyonu incelenmiştir. Katı adsorbanlann metal iyonları ile etkileşimi kesikli kaplarda gerçekleştirilmiştir. Adsorban maddeler, Cu(II), Zn(II), Co(II), Ni(II), Pb(II), Cr(III) ve Cr(VI) metallerinin sulu çözeltilerinin sorpsiyonu için, kesikli düzende çalışan kanştırmah kaplara konulmuştur. Öncelikle, her bir metal iyonunun optimum adsorplama şartlan belirlenmiştir. Metal-sorpsiyon işlemlerinde denge sorpsiyon izoterm eğrileri Freundlich ve Langmuir sorpsiyon izotermleri kullanılarak çizilmiş ve bu izotermlerden adsorpsiyon parametreleri (k, n, Qo ve b) hesaplanmıştır. Metal-adsorban denge çalışmalarında, metal iyonu konsantrasyonu, pH, sıcaklık, adsorban miktarı ve zaman faktörlerinin denge üzerine etkileri incelenmiştir. Cr(VI) iyonunun çözeltilerdeki miktarları UV-visible, diğer bütün çözeltilerde bulunan metal miktarı ise AAS cihazı kullanılarak ölçülmüştür.
CdSe Nanokristalleri ile Mikrokapsül Hazırlama ve Cr(VI) Gideriminde Kullanılması
(2018) Altunyaldız, Ayşe; Başlak, Canan; Arslan, Gülşin
Bu çalışmada, yüksek sıcaklıkta organometalik başlatıcılar ile ağır metal temelli CdSe nanokristalleri sentezlenmiş ve kitosan katkılı mikrokapsüllerin hazırlanması ile yeni bir nanokompozit mikrokapsül adsorban maddenin sulardan Cr(VI) gideriminde kullanılması amaçlanmıştır. Sentezlenen CdSe nanokristallerinin geçirimli elektron mikroskobu tekniği (TEM) ve X ışınları saçılım (XRD) ölçümleri ile yapısal analizleri yapılmıştır. Mikrokapsüllere ait adsorpsiyon kapasiteleri, başlangıç metal iyonu konsantrasyonları, pH, zaman ve adsorban dozunun adsorpsiyona etkileri Batch metoduna göre Cr(VI) iyonunun sulu çözeltilerden uzaklaştırılması araştırılmıştır. Cr(VI) metal-sorpsiyon işlemlerinde denge sorpsiyon izoterm eğrileri Freundlich ve Langmuir sorpsiyon izotermleri kullanılarak çizilmiş ve bu izotermlerden adsorpsiyon parametreleri hesaplanmıştır
Comparison of Adsorption Capacity of Young Brown Coals and Humic Acids Prepared From Different Coal Mines in Anatolia
(Elsevier Science Bv, 2006) Pehlivan, Erol; Arslan, Gülşin
Binding of Zn2+ and Cd2+ cations to relatively young brown coals YBC (lignite), humic acids (HAs) and commercial humic acid (CHA) were studied in aqueous media at pH 2.7-6 by polarographic method. This study was conducted to evaluate the removal of heavy metals in an aquatic system without prior treatment. The general principles of cation binding to YBC and humic materials are discussed. Sorption of heavy metal ions (Zn2+ and Cd2+) on samples of YBCs from three areas (Ilgin, Beysehir, and Ermenek) in the vicinity of the city of Konya in Anatolia (Turkey) were compared with sorption of these metal ions on HAs, prepared from these YBCs. The ability of both types of sorbent to remove metals from aqueous solutions was studied as a function of pH and concentration of initial metal solutions. Sorption depends strongly on pH, the origin of the YBC and on the nature of the metal ion. Whereas, for YBCs the main ligand groups seem to be carboxylate ions, this is not the case for the HA polymers. prepared from three YBCs, which differ substantially from properties of commercial samples of "HA". The process is very efficient especially in the case of low concentrations of pollutants in water, where common methods are either economically unfavorable or technically complicated. Of the two metal ions examined, Cd2+ was found to form the most stable HA complexes, followed by Zn. Effective removal of metals was demonstrated at pH-values of 5-5.7. The adsorption isotherm was measured at 25 degrees C, using adsorptive solutions at the optimum pH-value to determine the adsorption capacity. An important aspect of the proposed method was that the removal was performed on several metals at a pH-range in which a given metal undergoes an adsorption process making the method useful for wastewater treatment.
Determination of some inorganic metals in edible vegetable oils by inductively coupled plasma atomic emission spectroscopy (ICP-AES)
(CONSEJO SUPERIOR INVESTIGACIONES CIENTIFICAS-CSIC, 2008) Pehlivan, Erol; Arslan, Gülşin; Göde, Fethiye; Altun, Türkan; Özcan, M. Musa
Seventeen edible vegetable oils were analyzed spectrometrically for their metal (Cu, Fe, Mn, Co, Cr, Pb, Cd, Ni, and Zn) contents. Toxic metals in edible vegetable oils were determined by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). The highest metal concentrations were measured as 0.0850, 0.0352, 0.0220, 0.0040, 0.0010, 0.0074, 0.0045, 0.0254 and 0.2870 mg/kg for copper in almond oil, for iron in corn oil-(c), for manganese in soybean oil, for cobalt in sunflower oil-(b) and almond oil, for chromium in almond oil, for lead in virgin olive oil, for cadmium in sunflower oil-(e), for nickel almond oil and for zinc in almond oil respectively. The method for determining toxic metals in edible vegetable oils by using ICP-AES is discussed. The metals were extracted from low quantities of oil (2-3 g) with a 10% nitric acid solution. The extracted metal in acid solution can be injected into the ICP-AES. The proposed method is simple and allows the metals to be determined in edible vegetable oils with a precision estimated below 10% relative standard deviation (RSD) for Cu, 5% for Fe, 15% for Mn, 8% for Co, 10% for Cr, 20% for Pb, 5% for Cd, 16% for Ni and 11% for Zn.
Encapsulation of Edible Cuckoopint (Arum maculatum) Tuber Powder
(Selçuk Üniversitesi, 2023 Ekim) Saygın, Sevim; Varol, Berfin; Özdemir, Naciye; Sargın, İdris; Arslan, Gülşin
Cuckoopint (Arum maculatum), an edible wild plant species, grows in Asia, Europe, and North Africa. The aerial parts of the plant are consumed as food. The plant's tubers are used in traditional folk medicine to treat gastrointestinal disorders. When consumed fresh, the plant's tubers have a toxic effect, and the dried form is safe if it does not exceed a certain amount. Tuber powders can also have a poisonous effect when taken in excessive amounts accidentally and unconsciously. In this study, it was investigated whether it is possible to prepare the powder obtained by drying the tubers of the edible wild plant Arum maculatum by encapsulating it with chitosan, an edible, biocompatible, mucoadhesive polysaccharide, in specific doses. Arum maculatum-chitosan microcapsules were prepared with Arum maculatum tuber powder and chitosan. The effects of medium parameters such as pH, temperature, and ionic strength on the microcapsules' structural integrity and release properties were investigated. Encapsulation of tuber powders prepared in specific formulations into microcapsules can help prevent accidental overdose by the public. Commercial storage, transport, and marketing of cuckoopint tuber powder may be possible through encapsulation.
Facilitated transport of Cr(III) through activated composite membrane containing di-(2-ethylhexyl)phosphoric acid (DEHPA) as carrier agent
(ELSEVIER, 2009) Arslan, Gülşin; Tor, Ali; Çengeloğlu, Yunus; Ersöz, Mustafa
The facilitated transport of chromium(III) through activated composite membrane (ACM) containing di-(2-ethylhexyl) phosphoric acid (DEHPA) was investigated. DEHPA was immobilised by interfacial polymerisation on polysulfone layer which was deposited on non-woven fabric by using spin coater. Then. ACM was characterised by using scanning electron microscopy (SEM), contact angle measurements and atomic force microscopy (AFM). Initially, batch experiments of liquid-liquid distribution of Cr(III) and the extractant (DEHPA) were carried out to determine the appropriate pH of the feed phase and the results showed that maximum extraction of Cr(III) was achieved at a pH of 4. It Was also found that Cr(III) and DEHPA reacted in 1/1 molar ratio. The effects of Cr(III) (in feed phase), HCl (in stripping phase) and DEHPA (in ACM) concentrations were investigated. DEHPA concentration varies from 0.1 to 1.0M and it was determined that the transport of Cr(III) increased with the carrier concentration LIP to 0.8 M. It was also observed that the transport of Cr(III) through the ACM tended to increase with Cr(III) and HCl concentrations. The stability of ACM was also confirmed with replicate experiments. (C) 2008 Elsevier B.V. All rights reserved.
Facilitated transport of Cr(III) through polymer inclusion membrane with di(2-ethylhexyl)phosphoric acid (DEHPA)
(ELSEVIER, 2009) Tor, Ali; Arslan, Gülşin; Muslu, Harun; Çeliktaş, Ahmet; Çengeloğlu, Yunus; Ersöz, Mustafa
In this study, transport of Cr(III) through polymer inclusion membrane (PIM) with di(2-ethylhexyl)phosphoric acid (DEHPA) as carrier was reported. First, PIM was characterized by using FTIR and atomic force microscopy (AFM) techniques and contact angle measurements. Then, the effects of Cr(III) (in feed phase), HCI (in stripping phase) and DEHPA (in membrane) concentrations on the transport were investigated. DEHPA concentration varies from 0.25 to 0.5 M and it was determined that the transport of Cr(III) increased with the carrier concentration up to 0.4 M. It was also observed that the transport of Cr(III) through the PIM tended to increase with Cr(III) and HCI concentrations. According to the competitive transport of Cr(III), Cu(II) and Ni(II) through the PIM, the transport selectivity order was found as Cr(III)approximate to Cu(II)>Ni(II). The result from the transport of Cr(III) mixed with Cr(VI) also showed that flux of Cr(III)was not influenced by the presence of Cr(VI) in feed phase and no Cr(VI) transport through the PIM was determined. PIM had lower experimental Cr(III) flux than those of supported liquid membrane (SLM) and activated composite membrane (ACM) under the same experimental conditions. However, long-term stability of PIM and small difference between normalized flux for PIM and experimental SLM flux indicated that PIM could replace SLM for practical applications. (c) 2008 Elsevier B.V. All rights reserved.
Facilitated transport of Cr(VI) through a novel activated composite membrane containing Cyanex 923 as a carrier
(ELSEVIER, 2009) Arslan, Gülşin; Tor, Ali; Muslu, Harun; Özmen, Mustafa; Akın, İlker; Çengeloğlu, Yunus; Ersöz, Mustafa
This paper describes the facilitated transport of Cr(VI) through a novel Activated Composite Membrane (ACM) containing Cyanex 923 as a carrier. The ACM was prepared by immobilization of the Cyanex 923 on a polysulfone support by means of interfacial polymerisation. The prepared ACM was characterized by using scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques and contact angle measurements. The effect of feed phase composition, carrier concentration of the casting solution and stripping phase composition on the transport of Cr(VI) was investigated. When the feed phase contained 1 X 10(-3) M Cr(VI) at pH 1.0, 99% of Cr(VI) was transported through the ACM (prepared with 3% carrier solution) by using 1 M NaOH as a stripping phase. Furthermore, Cr(VI) was preferably transported in the presence of various metal ions (i.e., Cr(III), Ni(II), Cu(II), Zn(II), Cd(II), Co(II), etc.) and sulphate and nitrate ions had no negative effect on the transport of Cr(VI). The results also showed that transport efficiency of the ACM was reproducible and it could be efficiently used in the long-term separation processes instead of supported liquid membrane (SLM). (C) 2009 Elsevier B.V. All rights reserved.
Microcontact printing of an alkylsilane monolayer on the surface of glass
(SCIENTIFIC TECHNICAL RESEARCH COUNCIL TURKEY-TUBITAK, 2008) Arslan, Gülşin; Özmen, Mustafa; Hatay, İmren; Gübbük, İlkay Hilal; Ersöz, Mustafa
This paper describes the use of microcontact printing (mu CP) for patterning of self-assembledm onolayers (SAMs) of (3-aminopropyl)-triethoxysilane (APTES) and octadecyltrichloro silane (OTS) on the surface of glass and functionalization of alkylsilane monolayers. After activation of the glass surface, which was patterned wit h OTS using a poly(dimethylsiloxane) (PDMS) stamp, the remaining bars of the surfaces were treated with APTES and then treated with a dye solution. The characterization of printed silane compounds was confirmed using fluorescence microscopy on the basis of the reaction between terminal amine groups of APTES and thionylchloride of Rhodamine-B dye. Quantitative 3-dimensional pro. ling was performed for the whole modi. cation process by converting of microscopic images to numerical dimensions.
Physical and Chemical Factors Affecting the Adsorption of Cr(VI) via Humic Acids Extracted From Brown Coals
(Elsevier Science Bv, 2010) Arslan, Gülşin; Edebali, Serpil; Pehlivan, E.
The aim of this study is to demonstrate the potential of humic acids (HAs) as a low-cost reactive barrier material for environmental protection applications of toxic Cr(VI). Sorption of Cr(VI) on the HAs obtained from Ilgin, Beysehir and Ermenek lignites in Turkey were investigated and their sorption properties were compared with the activated carbon (AC) from Merck. The adsorption was carried out using a batch method. The sorption of Cr(VI) on the surface of HAs depends strongly on the pH and Cr(VI) sorption increased with a decreasing pH and increase in the concentration of this metal. The Freundlich adsorption isotherm was used to describe observed sorption phenomena. It was observed that the maximum adsorption capacity of 0.55 mmol Cr(VI)/g for Ilgin, 0.64 mmol Cr(VI)/g for Beysehir and 0.40 mmol Cr(VI)/g for Ermenek was achieved at pH of 3.2. The rise in temperature caused a slight decrease in the value of the equilibrium constant (K(c)) for the sorption of Cr(VI). The Cr(VI) sorption capacities of Beysehir and Ilgin HAs were nearly as same as that of AC (0.58 mmol Cr(VI)/g). Therefore, HAs are used for the adsorption of Cr(VI) in wastewater treatment applications.
Preparation of Prebiotic Pectin-Supplemented Vitamin C Microcapsules
(Selçuk Üniversitesi, 2024) Öztürk, Özlem Derya; Ergün, Samet; Özdemir, Naciye; Sargın, İdris; Arslan, Gülşin
Microencapsulating vitamin C with dietary fibers and prebiotics can improve the storage, preservation, and marketing of vitamin C supplements. This research aimed to explore the feasibility of creating microcapsules using vitamin C, pectin, and alginate through a microencapsulation technique. Pectin was extracted from lemon peel using an acid treatment and then characterized. The morphology of the vitamin C-pectin-alginate microcapsules was examined by scanning electron microscopy. Time, temperature, and pH-dependent vitamin C release profiles of the vitamin C-pectin-alginate microcapsules were studied. The rate of release of vitamin C increased towards pH values close to 7.0, with a higher rate of 83.97% observed at pH 7.0. Additionally, temperature affected the release of vitamin C from the microcapsules, with approximately 47.2% release at body temperature (37°C) and a higher fluctuation in vitamin C release was observed at 20°C. This study revealed that pectin extracted from lemon peels can be used with alginate to encapsulate vitamin C.
Removal of arsenate [As(V)] and arsenite [As(III)] from water by SWHR and BW-30 reverse osmosis
(ELSEVIER SCIENCE BV, 2011) Akın, İlker; Arslan, Gülşin; Tor, Ali; Çengeloğlu, Yunus; Ersöz, Mustafa
The removal of arsenate [As(V)] and arsenite [As(III)] from water was investigated by using reverse osmosis (RO) technique with SWHR and BW-30 (FILMTEC) membranes. The effect of pH and concentration of the feed water and operating pressure on the rejection of both arsenic species was examined. The experimental results indicated that rejection for both As(V) and As(III) mostly depended on the membrane type, pH of the feed water and operating pressure. For both membranes. As(V) rejection was maximum at pH above 4.0, while As(III) could be effectively removed from water at pH above 9.1. The rejection for both arsenic species increased with increasing operating pressure. The lowest permeate concentration of As(III) and As(V) was obtained when SWHR membrane was used. Finally, a natural (ground) water sample containing 50 mu g/L of As(V) and 12 mu g/L of As(III), respectively was treated by using RO with SWHR membrane. The obtained permeate concentration of total arsenic was compared with WHO and EU standards and permeate fluxes were evaluated by considering the chemical composition of the groundwater sample. (C) 2011 Elsevier B.V. All rights reserved.
Removal of boron from aqueous solution by using neutralized red mud
(ELSEVIER SCIENCE BV, 2007) Çengeloğlu, Yunus; Tor, Ali; Arslan, Gülşin; Ersöz, Mustafa; Gezgin, Sait
The adsorptive removal of boron from aqueous solution by using the neutralized red mud was studied in batch equilibration technique. The effects of pH, adsorbent dosage, initial boron concentration and contact time on the adsorption were investigated. The experiments demonstrated that boron removal was of a little fluctuation in pH range of 2-7 and it takes 20 min to attain equilibrium. The adsorption data was analyzed using the Langmuir and the Freundlich isotherm models and it was found that the Freundlich isotherm model represented the measured sorption data well. (c) 2006 Elsevier B.V. All rights reserved.
Removal of nitrate from aqueous solution by using red mud
(ELSEVIER SCIENCE BV, 2006) Çengeloğlu, Yunus; Tor, Ali; Ersöz, Mustafa; Arslan, Gülşin
The objective of this study is to remove the nitrate from aqueous solution by using the original and activated red mud in batch adsorption technique. The effects of pH, adsorbent dosage and contact time on the adsorption were investigated. The nitrate adsorption capacity of activated red mud was found to be higher than that of the original form and decreased above pH 7. Adsorption process was expressed by using Langmuir and Freundlich isotherms. Langmuir isotherm curves was found to be significant compared to Freundlich isotherm. Adsorption capacity of the original and activated red mud was found to be 1.859 and 5.858 mmol nitrate/g red mud, respectively. It was found that sufficient time for adsorption equilibrium of nitrate ions is 60 min. The mechanism for nitrate removal was explained by considering of chemical nature of red mud and interaction between metal oxides surface and nitrate ions. (c) 2006 Elsevier B.V. All rights reserved.
Şehir İçme Suyu Arıtma Tesislerinde Çamur Atıklarının Değerlendirme Yollarının Araştırılması
(Selçuk Üniversitesi Fen-Edebiyat Fakültesi, 2005) Atakol, Orhan; Arslan, Gülşin
Bu çalışmada, Ankara İvedik İçme Suyu Arıtma tesislerinde suyun arıtılma işlemi sonucunda atık olarak ele geçen jelimsi çamurun kimyasal yapısı araştırılmıştır. Kimyasal analizler hem klasik hem de Atomik Absorpsiyon yöntemleri kullanılarak yapılmıştır. Tarımsal açıdan mahsurunun olup olmadığı sera deneyleri yapılarak araştırılmıştır. Araştırma sonucunda atık çamurun ana bileşeni Al(OH)3 olup zaman içinde suyunu kaybederek okside dönüşmekte ve taşlaşmaktadır. Saksı deneylerine bakılırsa atık çamur içinde çimlenme olabilmekte ancak kontrol grupları ile karşılaştırıldığında çimlenme süresinin uzadığı kök ve yaprak boyunun kısaldığı görülmektedir. Bu atık çamurun çevreye kirletici etkisi olmadığı gibi pek bitki dostu da değildir. Ayrıca Al(OH)3 jelinin çökmesini hızlandırmak amacıyla ilave edilen polielektrolitin çimlenmeye etkisi olmadığı gibi yararlı olacağı düşüncesi ortaya çıkmıştır. Su arıtma tesislerinde en yüklü masraf Al2(SO4)3 için harcandığından dolayı, yüksek %’de Al bulunduran bu atık çamurdan yeniden Al2(SO4)3 eldesi araştırılmalıdır
Selectively facilitated transport of Zn(II) through a novel polymer inclusion membrane containing Cyanex 272 as a carrier reagent -- 2
(IWA PUBLISHING, 2012) Yılmaz, Abdurrahman; Arslan, Gülşin; Tor, Ali; Akın, İlker; Çengeloğlu, Yunus; Ersöz, Mustafa
[Abstract not Available]
Surface modification of glass beads with glutaraldehyde: Characterization and their adsorption property for metal ions
(ELSEVIER, 2009) Özmen, Mustafa; Can, Keziban; Akın, İlker; Arslan, Gülşin; Tor, Ali; Çengeloğlu, Yunus; Ersöz, Mustafa
In this study, a new material that adsorbs the metal ions was prepared by modification of the glass beads surfaces with glutaraldehyde. First, the glass beads were etched with 4 M NaOH solution. Then, they were reacted with 3-aminopropyl-triethoxysilane (APTES). Finally, silanized glass beads were treated with 25% of glutaraldehyde solution. The characterization studies by using Fourier Transform Infrared Spectroscopy (FT-IR),Thermal Gravimetric Analysis (TGA), elemental analysis and Scanning Electron Microscopy (SEM) indicated that modification of the glass bead surfaces was successfully performed. The adsorption studies exhibited that the modified glass beads could be efficiently used for the removal of the metal cations and anion (chromate ion) from aqueous solutions via chelation and ion-exchange mechanisms. For both Pb(II) and Cr(VI), selected as model ions, the adsorption equilibrium was achieved in 60 min and adsorption of both ions followed the second-order kinetic model. It was found that the sorption data was better represented by the Freundlich isotherm in comparison to the Langmuir and Redlich-Peterson isotherm models. The maximum adsorption capacities for Pb(II) and Cr(VI) were 9.947 and 11.571 mg/g, respectively. The regeneration studies also showed that modified glass beads could be re-used for the adsorption of Pb(II) and Cr(VI) from aqueous solutions over three cycles. (C) 2009 Elsevier B.V. All rights reserved.
Synthesis of Crosslinked Chitosan Possessing Schiff Base and Its Use in Metal Removal
(SPRINGER, 2012) Koçak, Nuriye; Şahin, Mustafa; Arslan, Gülşin; Uçan, H. İsmet
A chitosan resin derivatized with Schiff bases was synthesized by using a crosslinked chitosan (CCTS) as base material. We first synthesized N-benzylidene chitosan (CTB) by the reaction of benzaldehyde with chitosan. After this reaction crosslinking was carried out in the usage of epichlorohydrine (ECH) as a crosslinking agent. The Schiff base was removed by reacting diluted ethyl alcohol hydrochloride solution to give crosslinked chitosan (CCTS). The CCTS was suspended in a mixture of ethyl alcohol/deionized water followed by the addition of epichlorohydrine and by this way crosslinked chitosan-epichlorhydrine (CCTS-ECH) resin was synthesized. After the reaction was completed, the product was filtered, washed with ethyl alcohol and deionized water and dried in vacuum. The two novel polymeric ligands (CCTS-ECH-DHSalophen and CCTS-ECH-DHDPE) were synthesized by the reaction of CCTS-ECH with N,N'-bis(2,5 dihydroxybenzylidene)-1,2-diaminobenzene (DHSalophen), and N,N'-bis(2,5 dihydroxybenzylidene)-4,4'-diaminodiphenylether (DHDPE). The structures of the ligands were characterized by elemental analysis, infrared spectroscopy(FT-IR), scanning electron microscopy(SEM) and thermogravimetric analysis (TGA/DTA). Adsorption experiments (pH dependency, kinetics, and equilibrium) of compounds toward Cr(VI) from waste water were carried out at 25 degrees C.
Synthesis of Crosslinked Chitosan with Epichlorohydrin Possessing Two Novel Polymeric Ligands and Its Use in Metal Removal
(SPRINGER, 2011) Şahin, Mustafa; Koçak, Nuriye; Arslan, Gülşin; Uçan, Halil İsmet
One of the major applications of chitosan and its derivatives is based on its ability to bind strongly toxic metal ions. In this work, two novel polymeric ligands were synthesized to investigate the adsorption properties of Cu(II), Pb(II), Zn(II) and Ni(II) ions in an aqueous solution. To prevent the reaction between as the C-2 amine group of chitosan and ECH, the C-2 amine group was protected N-benzylidene chitosan (CTB). After the reaction with ECH to give N-benzaldehyde crosslinked chitosan (CCTB), the Schiff base was removed in a dilute ethanol hydrochloride solution to obtain CCTS which has free amine group. CCTS-ECH was synthesized by the reaction of CCTS and ECH. Then, CCTS-ECH was reacted with (2-hydroxyphenylimino)methylbenzene-1,4-diol (HBD) and N,N'-bis(2,5-dihydroxybenzylidene)-1,4-diaminobenzene (DHDB) to give ligands CCTS-ECH-HBD and CCTS-ECH-DHDB. The batch experiments showed that two novel polymeric ligands can be effectively used to remove Cu(II) from water.

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