The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform

Norli Ismail - One of the best experts on this subject based on the ideXlab platform.

  • la loaded tio2 encapsulated zeolite y catalysts investigating the characterization and decolorization process of Amaranth Dye
    The Journal of Engineering, 2013
    Co-Authors: Atheel Alwash, Ahmad Zuhairi Abdullah, Norli Ismail
    Abstract:

    Lanthanide ions loaded TiO2 encapsulated into Y zeolite catalysts were synthesized and used in sonocatalytic degradation of Amaranth Dye in aqueous solution. The support zeolite Y was modified by different loading of Ti and La species using ion exchange method. The sonocatalytic reaction condition was carried out at 10 mg/L initial Dye concentration, original pH, 1.5 g/L of catalyst loading with low ultrasonic frequency of 40 KHz. Different characterization techniques were used to reveal the physicochemical characteristics of the catalysts. Successful loading of TiO2 and La/TiO2 into zeolite Y was achieved. The framework of zeolite Y remained unchanged after the loading of TiO2. Titanium species was bound to the framework of zeolite through Ti–O–Si bonds through isomorphous substitution of Si in the zeolite. The ultrasonic degradation of Amaranth Dye was enhanced by the TiO2 encapsulation with a maximum degradation efficiency of 50% after 120 min of reaction. However, the activity of the catalyst decreased after the loading of lanthanum. This decrease was attributed to the poor contact between the metal crystallites located on the external surface and the titanium encapsulated into cages of zeolite Y.

  • elucidation of reaction behaviors in sonocatalytic decolorization of Amaranth Dye in water using zeolite y co incorporated with fe and tio 2
    Advances in Chemical Engineering and Science, 2013
    Co-Authors: Atheel Alwash, Ahmad Zuhairi Abdullah, Norli Ismail
    Abstract:

    The Zeolite Y as a support was modified by the incorporating of Fe and TiO2 in one single step using impregnation method. The synergistic effects between those components enhance the catalytic activity for the degradation of Amaranth Dye under ultrasonic irradiation with output power of 50 W and 40 kHz frequency. Different characterization techniques were used to elucidate the physical and chemical properties of the produced catalysts. The XRD results indicated that the type of titanium precursor significantly effects on the crystallinity of 0.4% Fe/15%TiO2-NaY catalyst. The AFM results detected that the TiO2 formed a layer covered the surface of zeolite while Fe clusters were located close to TiO2. The influence of reaction parameters such as TiO2 and Fe content, pH values, amount of hydrogen peroxide used, catalyst loading and the initial Dye concentration were investigated for the decolorization efficiency of Amaranth. The maximum decolorization efficiency for 0.4%Fe/15%TiO2-NaY was 100% after 120 min of reaction time with an initial Dye concentration of 30 mg/L, 2 g/L of catalyst loading, natural pH about 5.5 and 0.65 mM H2O2.

  • zeolite y encapsulated with fe tio2 for ultrasound assisted degradation of Amaranth Dye in water
    Journal of Hazardous Materials, 2012
    Co-Authors: Atheel Alwash, Ahmad Zuhairi Abdullah, Norli Ismail
    Abstract:

    A new heterogeneous catalyst for sonocatalytic degradation of Amaranth Dye in water was synthesized by introducing titania into the pores of zeolite (NaY) through ion exchange method while Fe (III) was immobilized on the encapsulated titanium via impregnation method. XRD results could not detect any peaks for titanium oxide or Fe(2)O(3) due to its low loading. The UV-vis analysis proved a blue shift toward shorter wavelength after the loading of Ti into NaY while a red shift was detected after the loading of Fe into the encapsulated titanium. Different reaction variables such as TiO(2) content, amount of Fe, pH values, amount of hydrogen peroxide, catalyst loading and the initial Dye concentration were studied to estimate their effect on the decolorization efficiency of Amaranth. The maximum decolorization efficiency achieved was 97.5% at a solution pH of 2.5, catalyst dosage of 2 g/L, 20 mmol/100 mL of H(2)O(2) and initial Dye concentration of 10 mg/L. The new heterogeneous catalyst Fe/Ti-NaY was a promising catalyst for this reaction and showed minimum Fe leaching at the end of the reaction.

Ana S Fajardo - One of the best experts on this subject based on the ideXlab platform.

  • electrochemical abatement of Amaranth Dye solutions using individual or an assembling of flow cells with ti pt and ti pt snsb anodes
    Separation and Purification Technology, 2017
    Co-Authors: Ana S Fajardo, Rui C Martins, Rosa M Quintaferreira, Djalma Ribeiro Da Silva, Carlos A Martinezhuitle
    Abstract:

    Abstract Electrochemical measurements and bulk electrolysis using individual or an assembling of flow cells in series were performed to study the anodic oxidation of Amaranth Dye solutions with Ti/Pt and Ti/Pt-SnSb anodes. Polarisation curves demonstrated that Ti/Pt-SnSb has high electroactivity to eliminate the pollutant. Bulk electrolysis with this material, at 30 mA cm −2 , removed 97.5% and 70.3% of colour and COD. Two cell configurations led to higher removal rates depending on the cell-electrode position. Additionally, experiments combining Ti/Pt-SnSb and Nb/BDD materials were performed to clarify the effect of non-active anodes in the system. Assembling cells revealed to be an interesting pre-treatment to degrade organic compounds. The suitable system choice will be dependent on the final target COD value, the reaction time and the energy consumption.

  • treatment of Amaranth Dye in aqueous solution by using one cell or two cells in series with active and non active anodes
    Electrochimica Acta, 2016
    Co-Authors: Ana S Fajardo, Rui C Martins, Carlos A Martinezhuitle, Rosa M Quintaferreira
    Abstract:

    Abstract The anodic oxidation of Amaranth Dye has been studied by electrochemical measurements (cyclic voltammetry and polarisation curves) and bulk electrolysis employing a single or two cells in a serial mode system using active and non-active anodes (Ti/IrO 2 -Ta 2 O 5 and Nb/BDD) as electrode materials. The results of electrochemical measurements showed that, Nb/BDD had a significant oxidation power to mineralise Amaranth Dye than Ti/IrO 2 -Ta 2 O 5 anode. Single cells were tested at different current densities (30, 60 and 80 mA cm −2 ). At Nb/BDD anode, total colour elimination and 49.1% of COD removal were achieved by applying 30 mA cm −2 after 60 min of treatment. Conversely, 98.5% of colour removal and 43.2% of COD decay were accomplished at 60 mA cm −2 with Ti/IrO 2 -Ta 2 O 5 electrode, after 360 min of electrolysis time. Supported on the obtained results with single cells, a system in a serial mode was further evaluated for the first time. The arrangement with Ti/IrO 2 -Ta 2 O 5 electrode at 30 mA cm −2 in the first cell followed by Nb/BDD anode at 30 mA cm −2 revealed the most interesting results. Complete decolourisation and 75.1% of COD abatement were achieved after 60 min with lower energy requirements of about 25.4 kWh m −3 (0.2 kWh gCOD −1 ). This study demonstrates the potential of a serial system to be applied as a wastewater pre-treatment approach.

Carlos A Martinezhuitle - One of the best experts on this subject based on the ideXlab platform.

  • electrochemical abatement of Amaranth Dye solutions using individual or an assembling of flow cells with ti pt and ti pt snsb anodes
    Separation and Purification Technology, 2017
    Co-Authors: Ana S Fajardo, Rui C Martins, Rosa M Quintaferreira, Djalma Ribeiro Da Silva, Carlos A Martinezhuitle
    Abstract:

    Abstract Electrochemical measurements and bulk electrolysis using individual or an assembling of flow cells in series were performed to study the anodic oxidation of Amaranth Dye solutions with Ti/Pt and Ti/Pt-SnSb anodes. Polarisation curves demonstrated that Ti/Pt-SnSb has high electroactivity to eliminate the pollutant. Bulk electrolysis with this material, at 30 mA cm −2 , removed 97.5% and 70.3% of colour and COD. Two cell configurations led to higher removal rates depending on the cell-electrode position. Additionally, experiments combining Ti/Pt-SnSb and Nb/BDD materials were performed to clarify the effect of non-active anodes in the system. Assembling cells revealed to be an interesting pre-treatment to degrade organic compounds. The suitable system choice will be dependent on the final target COD value, the reaction time and the energy consumption.

  • treatment of Amaranth Dye in aqueous solution by using one cell or two cells in series with active and non active anodes
    Electrochimica Acta, 2016
    Co-Authors: Ana S Fajardo, Rui C Martins, Carlos A Martinezhuitle, Rosa M Quintaferreira
    Abstract:

    Abstract The anodic oxidation of Amaranth Dye has been studied by electrochemical measurements (cyclic voltammetry and polarisation curves) and bulk electrolysis employing a single or two cells in a serial mode system using active and non-active anodes (Ti/IrO 2 -Ta 2 O 5 and Nb/BDD) as electrode materials. The results of electrochemical measurements showed that, Nb/BDD had a significant oxidation power to mineralise Amaranth Dye than Ti/IrO 2 -Ta 2 O 5 anode. Single cells were tested at different current densities (30, 60 and 80 mA cm −2 ). At Nb/BDD anode, total colour elimination and 49.1% of COD removal were achieved by applying 30 mA cm −2 after 60 min of treatment. Conversely, 98.5% of colour removal and 43.2% of COD decay were accomplished at 60 mA cm −2 with Ti/IrO 2 -Ta 2 O 5 electrode, after 360 min of electrolysis time. Supported on the obtained results with single cells, a system in a serial mode was further evaluated for the first time. The arrangement with Ti/IrO 2 -Ta 2 O 5 electrode at 30 mA cm −2 in the first cell followed by Nb/BDD anode at 30 mA cm −2 revealed the most interesting results. Complete decolourisation and 75.1% of COD abatement were achieved after 60 min with lower energy requirements of about 25.4 kWh m −3 (0.2 kWh gCOD −1 ). This study demonstrates the potential of a serial system to be applied as a wastewater pre-treatment approach.

Atheel Alwash - One of the best experts on this subject based on the ideXlab platform.

  • la loaded tio2 encapsulated zeolite y catalysts investigating the characterization and decolorization process of Amaranth Dye
    The Journal of Engineering, 2013
    Co-Authors: Atheel Alwash, Ahmad Zuhairi Abdullah, Norli Ismail
    Abstract:

    Lanthanide ions loaded TiO2 encapsulated into Y zeolite catalysts were synthesized and used in sonocatalytic degradation of Amaranth Dye in aqueous solution. The support zeolite Y was modified by different loading of Ti and La species using ion exchange method. The sonocatalytic reaction condition was carried out at 10 mg/L initial Dye concentration, original pH, 1.5 g/L of catalyst loading with low ultrasonic frequency of 40 KHz. Different characterization techniques were used to reveal the physicochemical characteristics of the catalysts. Successful loading of TiO2 and La/TiO2 into zeolite Y was achieved. The framework of zeolite Y remained unchanged after the loading of TiO2. Titanium species was bound to the framework of zeolite through Ti–O–Si bonds through isomorphous substitution of Si in the zeolite. The ultrasonic degradation of Amaranth Dye was enhanced by the TiO2 encapsulation with a maximum degradation efficiency of 50% after 120 min of reaction. However, the activity of the catalyst decreased after the loading of lanthanum. This decrease was attributed to the poor contact between the metal crystallites located on the external surface and the titanium encapsulated into cages of zeolite Y.

  • elucidation of reaction behaviors in sonocatalytic decolorization of Amaranth Dye in water using zeolite y co incorporated with fe and tio 2
    Advances in Chemical Engineering and Science, 2013
    Co-Authors: Atheel Alwash, Ahmad Zuhairi Abdullah, Norli Ismail
    Abstract:

    The Zeolite Y as a support was modified by the incorporating of Fe and TiO2 in one single step using impregnation method. The synergistic effects between those components enhance the catalytic activity for the degradation of Amaranth Dye under ultrasonic irradiation with output power of 50 W and 40 kHz frequency. Different characterization techniques were used to elucidate the physical and chemical properties of the produced catalysts. The XRD results indicated that the type of titanium precursor significantly effects on the crystallinity of 0.4% Fe/15%TiO2-NaY catalyst. The AFM results detected that the TiO2 formed a layer covered the surface of zeolite while Fe clusters were located close to TiO2. The influence of reaction parameters such as TiO2 and Fe content, pH values, amount of hydrogen peroxide used, catalyst loading and the initial Dye concentration were investigated for the decolorization efficiency of Amaranth. The maximum decolorization efficiency for 0.4%Fe/15%TiO2-NaY was 100% after 120 min of reaction time with an initial Dye concentration of 30 mg/L, 2 g/L of catalyst loading, natural pH about 5.5 and 0.65 mM H2O2.

  • zeolite y encapsulated with fe tio2 for ultrasound assisted degradation of Amaranth Dye in water
    Journal of Hazardous Materials, 2012
    Co-Authors: Atheel Alwash, Ahmad Zuhairi Abdullah, Norli Ismail
    Abstract:

    A new heterogeneous catalyst for sonocatalytic degradation of Amaranth Dye in water was synthesized by introducing titania into the pores of zeolite (NaY) through ion exchange method while Fe (III) was immobilized on the encapsulated titanium via impregnation method. XRD results could not detect any peaks for titanium oxide or Fe(2)O(3) due to its low loading. The UV-vis analysis proved a blue shift toward shorter wavelength after the loading of Ti into NaY while a red shift was detected after the loading of Fe into the encapsulated titanium. Different reaction variables such as TiO(2) content, amount of Fe, pH values, amount of hydrogen peroxide, catalyst loading and the initial Dye concentration were studied to estimate their effect on the decolorization efficiency of Amaranth. The maximum decolorization efficiency achieved was 97.5% at a solution pH of 2.5, catalyst dosage of 2 g/L, 20 mmol/100 mL of H(2)O(2) and initial Dye concentration of 10 mg/L. The new heterogeneous catalyst Fe/Ti-NaY was a promising catalyst for this reaction and showed minimum Fe leaching at the end of the reaction.

Rosa M Quintaferreira - One of the best experts on this subject based on the ideXlab platform.

  • electrochemical abatement of Amaranth Dye solutions using individual or an assembling of flow cells with ti pt and ti pt snsb anodes
    Separation and Purification Technology, 2017
    Co-Authors: Ana S Fajardo, Rui C Martins, Rosa M Quintaferreira, Djalma Ribeiro Da Silva, Carlos A Martinezhuitle
    Abstract:

    Abstract Electrochemical measurements and bulk electrolysis using individual or an assembling of flow cells in series were performed to study the anodic oxidation of Amaranth Dye solutions with Ti/Pt and Ti/Pt-SnSb anodes. Polarisation curves demonstrated that Ti/Pt-SnSb has high electroactivity to eliminate the pollutant. Bulk electrolysis with this material, at 30 mA cm −2 , removed 97.5% and 70.3% of colour and COD. Two cell configurations led to higher removal rates depending on the cell-electrode position. Additionally, experiments combining Ti/Pt-SnSb and Nb/BDD materials were performed to clarify the effect of non-active anodes in the system. Assembling cells revealed to be an interesting pre-treatment to degrade organic compounds. The suitable system choice will be dependent on the final target COD value, the reaction time and the energy consumption.

  • treatment of Amaranth Dye in aqueous solution by using one cell or two cells in series with active and non active anodes
    Electrochimica Acta, 2016
    Co-Authors: Ana S Fajardo, Rui C Martins, Carlos A Martinezhuitle, Rosa M Quintaferreira
    Abstract:

    Abstract The anodic oxidation of Amaranth Dye has been studied by electrochemical measurements (cyclic voltammetry and polarisation curves) and bulk electrolysis employing a single or two cells in a serial mode system using active and non-active anodes (Ti/IrO 2 -Ta 2 O 5 and Nb/BDD) as electrode materials. The results of electrochemical measurements showed that, Nb/BDD had a significant oxidation power to mineralise Amaranth Dye than Ti/IrO 2 -Ta 2 O 5 anode. Single cells were tested at different current densities (30, 60 and 80 mA cm −2 ). At Nb/BDD anode, total colour elimination and 49.1% of COD removal were achieved by applying 30 mA cm −2 after 60 min of treatment. Conversely, 98.5% of colour removal and 43.2% of COD decay were accomplished at 60 mA cm −2 with Ti/IrO 2 -Ta 2 O 5 electrode, after 360 min of electrolysis time. Supported on the obtained results with single cells, a system in a serial mode was further evaluated for the first time. The arrangement with Ti/IrO 2 -Ta 2 O 5 electrode at 30 mA cm −2 in the first cell followed by Nb/BDD anode at 30 mA cm −2 revealed the most interesting results. Complete decolourisation and 75.1% of COD abatement were achieved after 60 min with lower energy requirements of about 25.4 kWh m −3 (0.2 kWh gCOD −1 ). This study demonstrates the potential of a serial system to be applied as a wastewater pre-treatment approach.