Browsing by Author "Demey Cedeño, Hary"

Now showing items 1-15 of 15

    • Antimony removal from water by a chitosan-Iron(III)[ChiFer(III)] biocomposite 

      Lapo, Byron; Demey Cedeño, Hary; Carchi, Tany; Sastre Requena, Ana María (Multidisciplinary Digital Publishing Institute (MDPI), 2019-02-01)
      Article
      Open Access
      The presence of antimony(III) in water represents a worldwide concern, mainly due to its high toxicity and carcinogenicity potential. It can be separated from water by the use of sustainable biopolymers such as chitosan ...

    • Boron recovery from seawater with a new low-cost adsorbent material 

      Demey Cedeño, Hary; Vincent, Thierry; Ruiz Planas, Montserrat; Nogueras Cervera, Marc; Sastre Requena, Ana María; Guibal, Eric (2014-10-15)
      Article
      Restricted access - publisher's policy
      A new adsorbent [chiFer(III)] for boron recovery from seawater was prepared using chitosan and iron(III) hydroxide. Experiments were carried out in a column system. Seawater samples were collected from the Mediterranean ...

    • Boron removal from aqueous solutions by using a novel alginate-based sorbent: Comparison with Al2O3 particles 

      Demey Cedeño, Hary; Barrón Zambrano, Jesús Alberto; Mhadhbi, Takoua; Miloudi, Hafida; Yang, Zhen; Ruiz Planas, Montserrat; Sastre Requena, Ana María (Multidisciplinary Digital Publishing Institute (MDPI), 2019-09-01)
      Article
      Open Access
      Boron removal was evaluated in the present work by using calcium alginate beads (CA) and a novel composite based on alginate–alumina (CAAl) as sorbents in a batch system. The effects of different parameters such as pH, ...

    • Boron removal from aqueous solutions using alginate gel beads in fixed-bed systems 

      Demey Cedeño, Hary; Ruiz Planas, Montserrat; Barrón Zambrano, Jesús Alberto; Sastre Requena, Ana María (2014-06-01)
      Article
      Open Access
      BACKGROUNDA column sorption study was carried out using calcium alginate gel beads as adsorbent for the removal of boron from aqueous solutions. The breakthrough curve was obtained as a function of pH, initial concentration ...

    • Cadmium removal by a low-cost magadiite-based material: Characterization and sorption applications 

      Attar, Keltoum; Bouazza, Djamila; Miloudi, Hafida; Tayeb, Abdelkader; Sastre Requena, Ana María; Demey Cedeño, Hary (Elsevier, 2018-08-01)
      Article
      Open Access
      The sorption of cadmium from nitrate medium at room temperature was carried out using solid phase magadiite and magadiite impregnated with Cyanex 272 [bis(2,4,4-trimethylpentyl)phosphinic acid]. The sorbent materials have ...

    • Desarrollo de procesos de separación y recuperación del boro de aguas contaminadas mediante el uso de biopolímeros 

      Demey Cedeño, Hary (Universitat Politècnica de Catalunya, 2010-09)
      Master thesis
      Restricted access - author's decision
      El agua es un recurso fundamental para todos los seres vivientes y es un recurso indispensable para el desarrollo industrial. La creciente presión que genera el crecimiento poblacional y el aumento de las necesidades de ...

    • Development of a new chitosan/Ni(OH)(2)-based sorbent for boron removal 

      Demey Cedeño, Hary; Vincent, Thierry; Ruiz Planas, Montserrat; Sastre Requena, Ana María; Guibal, Eric (2014-05-15)
      Article
      Restricted access - publisher's policy
      A new composite containing chitosan (as the encapsulating material) and nickel (II) hydroxide [chiNi(II)] has been manufactured for the removal of boron from aqueous solutions. The biosorbent was characterised using SEM ...

    • Evaluation of torrefied poplar-biomass as a low-cost sorbent for lead and terbium removal from aqueous solutions and energy co-generation 

      Demey Cedeño, Hary; Melkior, Thierry; Chatroux, A.; Attar, Keltoum; Sastre Requena, Ana María (2019-04-01)
      Article
      Open Access
      Two low-cost renewable poplar-based materials were manufactured in this work for energy production and as sorbents for lead and terbium removal from aqueous effluents. Torrefaction was used as a pretreatment process for ...

    • Neodymium recovery by chitosan/iron(III) hydroxide [ChiFer(III)] sorbent material: Batch and column systems 

      Demey Cedeño, Hary; Lapo, Byron; Ruiz Planas, Montserrat; Fortuny Sanromá, Agustín; Marchand, Muriel; Sastre Requena, Ana María (2018-02-19)
      Article
      Open Access
      A low cost composite material was synthesized for neodymium recovery from dilute aqueous solutions. The in-situ production of the composite containing chitosan and iron(III) hydroxide (ChiFer(III)) was improved and the ...

    • Neodymium recovery from the aqueous phase using a residual material from saccharified banana-rachis/polyethylene-glycol 

      Lapo Calderón, Byron Gonzalo; Pavón Regaña, Sandra; Bertau, Martin; Demey Cedeño, Hary; Meneses, Miguel; Sastre Requena, Ana María (Multidisciplinary Digital Publishing Institute (MDPI), 2023-03-27)
      Article
      Open Access
      Neodymium (Nd) is a key rare earth element (REE) needed for the future of incoming technologies including road transport and power generation. Hereby, a sustainable adsorbent material for recovering Nd from the aqueous ...

    • Removal of boron from aqueous solutions using biopolymers and composites 

      Demey Cedeño, Hary (Universitat Politècnica de Catalunya, 2014-11-25)
      Doctoral thesis
      Open Access
      The growing concern over environmental pollution in recent decades has placed increasing focus on research into the development of sustainable processes associated with the removal of contaminants in waters. Water is scarcer ...

    • Removal of zinc from aqueous solutions using lamellar double hydroxide materials impregnated with Cyanex 272: Characterization and sorption studies 

      Boudaoud, Nacera; Miloudi, Hafida; Bouazza, Djamila; Adjdir, Mehdi; Tayeb, Abdelkader; Fortuny Sanromá, Agustín; Demey Cedeño, Hary; Sastre Requena, Ana María (2020-03-11)
      Article
      Open Access
      Removal of heavy metals from wastewater is mandatory in order to avoid water pollution of natural reservoirs. In the present study, layered double hydroxide (LDH) materials were evaluated for removal of zinc from aqueous ...

    • Sorption and desorption studies of Pb(II) and Ni(II) from aqueous solutions by a new composite based on alginate and magadiite materials 

      Attar, Keltoum; Demey Cedeño, Hary; Bouazza, Djamila; Sastre Requena, Ana María (Multidisciplinary Digital Publishing Institute (MDPI), 2019-02-15)
      Article
      Open Access
      A new composite material based on alginate and magadiite/Di-(2-ethylhexyl) phosphoric acid (CAM-D2EHPA) was successfully prepared by previous impregnation of layered magadiite with D2EHPA extractant, and then immobilized ...

    • Sorption of boron calcium alginate gel beads 

      Ruiz Planas, Montserrat; Tobalina, Carlos; Demey Cedeño, Hary; Barrón Zambrano, Jesús Alberto; Sastre Requena, Ana María (2013-04)
      Article
      Restricted access - publisher's policy
      In this work, the removal of boron by a biopolymer of alginate was studied in an aqueous solution. The effects of pH, initial boron concentration, alginate concentration in the beads and stirring time were evaluated. The ...

    • Sorption of Hg(II) and Pb(II) ions on chitosan-iron(III) from aqueous solutions: Single and binary systems 

      Lapo, Byron; Demey Cedeño, Hary; Zapata, Jessenia; Romero, Cristhian; Sastre Requena, Ana María (Multidisciplinary Digital Publishing Institute (MDPI), 2018-03-25)
      Article
      Open Access
      The present work describes the study of mercury Hg(II) and lead Pb(II) removal in single and binary component systems into easily prepared chitosan-iron(III) bio-composite beads. Scanning electron microscopy and energy-dispersive ...