Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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Department: search.filters.department.İzmir Institute of Technology. ChemistrySubject: search.filters.subject.Alumina

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Now showing 1 - 3 of 3
  • Article
    Citation - WoS: 5
    Citation - Scopus: 7
    Alumina/Water Suspensions in the Presence of Peo-Ppo Triblock Copolymers
    (Elsevier Ltd., 2004) Şakar Deliormanlı, Aylin; Polat, Hürriyet; Polat, Hürriyet; Çiftçioğlu, Muhsin; Şakar Deliormanlı, Aylin Müyesser; 03.02. Department of Chemical Engineering; 04.01. Department of Chemistry; 03. Faculty of Engineering; 04. Faculty of Science; 01. Izmir Institute of Technology
    The aim of this study was to investigate the stability and dispersion behaviour of aqueous alumina suspensions in the presence of polyethylene oxide-polypropylene oxide-polyethylene oxide (PEO-PPO-PEO) type triblock copolymers. For this purpose alumina suspensions at various solids loadings were prepared using four different methods. These are: Method I: powder and water were stirred only; Method II: powder and water were stirred and ultrasonic treatment was applied; Method III: powder and water were stirred in the presence of block copolymers; Method IV: powder and water were stirred and ultrasonic treatment was applied in the presence of block copolymers. These suspensions were characterized by means of rheological measurements. Sedimentation and turbidity measurements were also conducted to support these results and to investigate the stability of these systems for longer times. Surface tension measurements were performed to investigate the adsorption behaviour of block copolymers onto alumina surface. It was found that the use of PEO-PPO-PEO type triblock copolymers improved the dispersion behaviour of aqueous alumina suspensions in the presence of ultrasonic treatment at low solids loadings. However their effect was not significant at high solids loadings and without ultrasonic treatment.
  • Article
    Citation - WoS: 35
    Citation - Scopus: 40
    Preparation and Characterization of Alumina-Supported Iron Nanoparticles and Its Application for the Removal of Aqueous Cu2+ Ions
    (Elsevier Ltd., 2011) Karabelli, Duygu; Ünal, Semira; Eroğlu, Ahmet Emin; Eroğlu, Ahmet Emin; Shahwan, Talal; 04.01. Department of Chemistry; 04. Faculty of Science; 01. Izmir Institute of Technology
    A composite sorbent of iron nanoparticles and alumina (Al–nZVI) was prepared and applied in the removal of Cu2+ ions from aqueous solutions. Alumina was introduced in a solution of Fe2+ ions, which were then reduced to metallic iron nanoparticles using borohydride ions. The characterization results showed that iron nanoparticles were partially dispersed on alumina surface, with their diameter being in the range 10–80 nm. The uptake experiments were performed at initial Cu2+ concentrations ranging from 10.0 to 500.0 mg/L. The experiments investigated the effects of initial concentration, contact time, and repetitive usage of the Al–nZVI on the extent of removal of Cu2+ ions. The composite sorbent demonstrated fast uptake, and its fixation capacity was 1.50 mmol/g (95.3 mg/g), which is well above that of pure alumina (0.32 mmol/g; 20.3 mg/g).
  • Article
    Citation - WoS: 60
    Citation - Scopus: 67
    Removal of Aqueous Rare Earth Elements (rees) Using Nano-Iron Based Materials
    (Korean Society of Industrial Engineering Chemistry, 2013) Ünal Yeşiller, Semira; Eroğlu, Ahmet Emin; Shahwan, Talal; Eroğlu, Ahmet Emin; 04.01. Department of Chemistry; 04. Faculty of Science; 01. Izmir Institute of Technology
    The uptake of REEs was investigated using nano-zero valent iron (nZVI) and alumina-supported nZVI (Al-nZVI). The results indicated fast uptake, with saturation approached within 10 min of contact between solutions and solids. Upon using nZVI, the uptake of REEs seemed to be quantitative over the studied range of concentration; 1.0–100.0 mg L−1. When Al-nZVI was used, complete removal was achieved within the range of 1.0–10.0 mg L−1. The solids demonstrated stable performance beyond pH of 2.0, up to neutral pH conditions. Fractionation of REEs on Al-nZVI was observed. The REE ions seem to be fixed to oxide and oxyhydroxide surface groups.