The Experts below are selected from a list of 120 Experts worldwide ranked by ideXlab platform
Linda Onnby - One of the best experts on this subject based on the ideXlab platform.
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arsenic adsorption by iron Aluminium hydroxide coated onto macroporous supports insights from x ray absorption spectroscopy and comparison with granular ferric Hydroxides
Journal of Hazardous Materials, 2016Co-Authors: Prashanth Suresh Kumar, Roxana Quiroga Flores, Carin Sjostedt, Linda OnnbyAbstract:This paper evaluates the arsenic adsorption characteristics of a macroporous polymer coated with coprecipitated iron-Aluminium Hydroxides (MHCMP). The MHCMP adsorbent-composite fits best with a pseudo-second order model for As(III) and a pseudo-first order kinetic model for As(V). The MHCMP shows a maximum adsorption capacity of 82.3 and 49.6mgAs/g adsorbent for As(III) and As(V) ions respectively, and adsorption followed the Langmuir model. Extended X-ray absorption fine structure showed that binding of As(III) ions were confirmed to take place on the iron Hydroxides coated on the MHCMP, whereas for As(V) ions the binding specificity could not be attributed to one particular metal hydroxide. As(III) formed a bidentate mononuclear complex with Fe sites, whereas As(V) indicated on a bidentate binuclear complex with Al sites or monodentate with Fe sites on the adsorbent. The column experiments were run in a well water spiked with a low concentration of As(III) (100μg/L) and a commercially available adsorbent (GEH(®)102) based on granular iron-hydroxide was used for comparison. It was found that the MHCMP was able to treat 7 times more volume of well water as compared to GEH(®)102, maintaining the threshold concentration of less than 10μgAs/L, indicating that the MHCMP is a superior adsorbent. (Less)
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arsenic adsorption by iron Aluminium hydroxide coated onto macroporous supports insights from x ray absorption spectroscopy and comparison with granular ferric Hydroxides
Journal of Hazardous Materials, 2016Co-Authors: Prashanth Suresh Kumar, Roxana Quiroga Flores, Carin Sjostedt, Linda OnnbyAbstract:This paper evaluates the arsenic adsorption characteristics of a macroporous polymer coated with coprecipitated iron-Aluminium Hydroxides (MHCMP). The MHCMP adsorbent-composite fits best with a pseudo-second order model for As(III) and a pseudo-first order kinetic model for As(V). The MHCMP shows a maximum adsorption capacity of 82.3 and 49.6 mg As/g adsorbent for As(III) and As(V) ions respectively, and adsorption followed the Langmuir model. Extended X-ray absorption fine structure showed that binding of As(III) ions were confirmed to take place on the iron Hydroxides coated on the MHCMP, whereas for As(V) ions the binding specificity could not be attributed to one particular metal hydroxide. As(III) formed a bidentate mononuclear complex with Fe sites, whereas As(V) indicated on a bidentate binuclear complex with Al sites or monodentate with Fe sites on the adsorbent. The column experiments were run in a well water spiked with a low concentration of As(III) (100 μg/L) and a commercially available adsorbent (GEH(®)102) based on granular iron-hydroxide was used for comparison. It was found that the MHCMP was able to treat 7 times more volume of well water as compared to GEH(®)102, maintaining the threshold concentration of less than 10 μg As/L, indicating that the MHCMP is a superior adsorbent.
Khalid S Hashim - One of the best experts on this subject based on the ideXlab platform.
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electrocoagulation as a green technology for phosphate removal from river water
Separation and Purification Technology, 2019Co-Authors: Khalid S Hashim, A Shaw, Rafid Al Khaddar, Montserrat Ortoneda Pedrola, David Phipps, Nisreen Jasim, Patryk Kot, Ali W AlattabiAbstract:Abstract The current study investigates the removal of phosphate from water using a new baffle plates Aluminium-based electrochemical cell (PBPR) taking consideration the influence of key operating parameters. This new cell utilises perforated baffle plates as a water mixer rather than magnetic stirrers that require extra power to work. As this unit is new, a comprehensive study has been carried to assess it performance. This study also includes preliminary estimates of the reactor’s operating costs, the amount of H2 gas produced and the yieldable energy from it. SEM (scanning electron microscope) was used to investigate the influence of the electrocoagulation process on the morphology of the surface of Aluminium electrodes, and an empirical model developed to reproduce the phosphate removal process. The results showed that 99% of phosphate was removed within 60 min of electrolysis at an initial pH (ipH) of 6, inter-electrode distance (ID) of 0.5 cm, current density (J) of 6 mA/cm2, initial concentration of phosphate (IC) of 100 mg/L, and minimum operating cost of 0.503 US $/m3. The electrochemical cell produced enough H2 gas to generate 4.34 kWh/m3 of power. Statistically, it was proved that the influence of the operating parameters on phosphate removal could be modelled with an R2 of 0.882, the influence of these operating parameters on phosphate removal following the order: t > J > I C > i p H > I D . Finally, SEM images showed that after several electrolysing runs, the Al anode became rough and nonuniform which could be related to the production of Aluminium Hydroxides.
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defluoridation of drinking water using a new flow column electrocoagulation reactor fcer experimental statistical and economic approach
Journal of Environmental Management, 2017Co-Authors: Khalid S Hashim, A Shaw, Rafid Al Khaddar, Montserrat Ortoneda Pedrola, David PhippsAbstract:A new batch, flow column electrocoagulation reactor (FCER) that utilises a perforated plate flow column as a mixer has been used to remove fluoride from drinking water. A comprehensive study has been carried out to assess its performance. The efficiency of fluoride removal (R%) as a function of key operational parameters such as initial pH, detention time (t), current density (CD), inter-electrode distance (ID) and initial concentration (C0) has been examined and an empirical model has been developed. A scanning electron microscopy (SEM) investigation of the influence of the EC process on morphology of the surface of the Aluminium electrodes, showed the erosion caused by Aluminium loss. A preliminary estimation of the reactor's operating cost is suggested, allowing for the energy from recycling of hydrogen gas hydrogen gas produced amount. The results obtained showed that 98% of fluoride was removed within 25 min of electrolysis at pH of 6, ID of 5 mm, and CD of 2 mA/cm2. The general relationship between fluoride removal and operating parameters could be described by a linear model with R2 of 0.823. The contribution of the operating parameters to the suggested model followed the order: t > CD > C0 > ID > pH. The SEM images obtained showed that, after the EC process, the surface of the anodes, became non-uniform with a large number of irregularities due to the generation of Aluminium Hydroxides. It is suggested that these do not materially affect the performance. A provisional estimate of the operating cost was 0.379 US $/m3. Additionally, it has been found that 0.6 kW/m3 is potentially recoverable from the H2 gas.
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energy efficient electrocoagulation using a new flow column reactor to remove nitrate from drinking water experimental statistical and economic approach
Journal of Environmental Management, 2017Co-Authors: Khalid S Hashim, A Shaw, Rafid Al Khaddar, Montserrat Ortoneda Pedrola, David PhippsAbstract:Abstract In this investigation, a new bench-scale electrocoagulation reactor (FCER) has been applied for drinking water denitrification. FCER utilises the concepts of flow column to mix and aerate the water. The water being treated flows through the perforated Aluminium disks electrodes, thereby efficiently mixing and aerating the water. As a result, FCER reduces the need for external stirring and aerating devices, which until now have been widely used in the electrocoagulation reactors. Therefore, FCER could be a promising cost-effective alternative to the traditional lab-scale EC reactors. A comprehensive study has been commenced to investigate the performance of the new reactor. This includes the application of FCER to remove nitrate from drinking water. Estimation of the produced amount of H 2 gas and the yieldable energy from it, an estimation of its preliminary operating cost, and a SEM (scanning electron microscope) investigation of the influence of the EC process on the morphology of the surface of electrodes. Additionally, an empirical model was developed to reproduce the nitrate removal performance of the FCER. The results obtained indicated that the FCER reduced the nitrate concentration from 100 to 15 mg/L (World Health Organization limitations for infants) after 55 min of electrolysing at initial pH of 7, GBE of 5 mm, CD of 2 mA/cm 2 , and at operating cost of 0.455 US $/m 3 . Additionally, it was found that FCER emits H 2 gas enough to generate a power of 1.36 kW/m 3 . Statistically, the relationship between the operating parameters and nitrate removal could be modelled with R 2 of 0.848. The obtained SEM images showed a large number dents on anode's surface due to the production of Aluminium Hydroxides.
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iron removal energy consumption and operating cost of electrocoagulation of drinking water using a new flow column reactor
Journal of Environmental Management, 2017Co-Authors: Khalid S Hashim, A Shaw, Rafid Al Khaddar, Montserrat Ortoneda Pedrola, David PhippsAbstract:The goal of this project was to remove iron from drinking water using a new electrocoagulation (EC) cell. In this research, a flow column has been employed in the designing of a new electrocoagulation reactor (FCER) to achieve the planned target. Where, the water being treated flows through the perforated disc electrodes, thereby effectively mixing and aerating the water being treated. As a result, the stirring and aerating devices that until now have been widely used in the electrocoagulation reactors are unnecessary. The obtained results indicated that FCER reduced the iron concentration from 20 to 0.3 mg/L within 20 min of electrolysis at initial pH of 6, inter-electrode distance (ID) of 5 mm, current density (CD) of 1.5 mA/cm2, and minimum operating cost of 0.22 US $/m3. Additionally, it was found that FCER produces H2 gas enough to generate energy of 10.14 kW/m3. Statistically, it was found that the relationship between iron removal and operating parameters could be modelled with R2 of 0.86, and the influence of operating parameters on iron removal followed the order: C0>t>CD>pH. Finally, the SEM (scanning electron microscopy) images showed a large number of irregularities on the surface of anode due to the generation of Aluminium Hydroxides.
Roxana Quiroga Flores - One of the best experts on this subject based on the ideXlab platform.
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arsenic adsorption by iron Aluminium hydroxide coated onto macroporous supports insights from x ray absorption spectroscopy and comparison with granular ferric Hydroxides
Journal of Hazardous Materials, 2016Co-Authors: Prashanth Suresh Kumar, Roxana Quiroga Flores, Carin Sjostedt, Linda OnnbyAbstract:This paper evaluates the arsenic adsorption characteristics of a macroporous polymer coated with coprecipitated iron-Aluminium Hydroxides (MHCMP). The MHCMP adsorbent-composite fits best with a pseudo-second order model for As(III) and a pseudo-first order kinetic model for As(V). The MHCMP shows a maximum adsorption capacity of 82.3 and 49.6mgAs/g adsorbent for As(III) and As(V) ions respectively, and adsorption followed the Langmuir model. Extended X-ray absorption fine structure showed that binding of As(III) ions were confirmed to take place on the iron Hydroxides coated on the MHCMP, whereas for As(V) ions the binding specificity could not be attributed to one particular metal hydroxide. As(III) formed a bidentate mononuclear complex with Fe sites, whereas As(V) indicated on a bidentate binuclear complex with Al sites or monodentate with Fe sites on the adsorbent. The column experiments were run in a well water spiked with a low concentration of As(III) (100μg/L) and a commercially available adsorbent (GEH(®)102) based on granular iron-hydroxide was used for comparison. It was found that the MHCMP was able to treat 7 times more volume of well water as compared to GEH(®)102, maintaining the threshold concentration of less than 10μgAs/L, indicating that the MHCMP is a superior adsorbent. (Less)
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arsenic adsorption by iron Aluminium hydroxide coated onto macroporous supports insights from x ray absorption spectroscopy and comparison with granular ferric Hydroxides
Journal of Hazardous Materials, 2016Co-Authors: Prashanth Suresh Kumar, Roxana Quiroga Flores, Carin Sjostedt, Linda OnnbyAbstract:This paper evaluates the arsenic adsorption characteristics of a macroporous polymer coated with coprecipitated iron-Aluminium Hydroxides (MHCMP). The MHCMP adsorbent-composite fits best with a pseudo-second order model for As(III) and a pseudo-first order kinetic model for As(V). The MHCMP shows a maximum adsorption capacity of 82.3 and 49.6 mg As/g adsorbent for As(III) and As(V) ions respectively, and adsorption followed the Langmuir model. Extended X-ray absorption fine structure showed that binding of As(III) ions were confirmed to take place on the iron Hydroxides coated on the MHCMP, whereas for As(V) ions the binding specificity could not be attributed to one particular metal hydroxide. As(III) formed a bidentate mononuclear complex with Fe sites, whereas As(V) indicated on a bidentate binuclear complex with Al sites or monodentate with Fe sites on the adsorbent. The column experiments were run in a well water spiked with a low concentration of As(III) (100 μg/L) and a commercially available adsorbent (GEH(®)102) based on granular iron-hydroxide was used for comparison. It was found that the MHCMP was able to treat 7 times more volume of well water as compared to GEH(®)102, maintaining the threshold concentration of less than 10 μg As/L, indicating that the MHCMP is a superior adsorbent.
D. Szychowski - One of the best experts on this subject based on the ideXlab platform.
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influence of Aluminium precursor on physico chemical properties of Aluminium Hydroxides and oxides part ii al clo4 3 9h2o
Journal of Thermal Analysis and Calorimetry, 2006Co-Authors: Barbara Pacewska, Olga Klukploskonska, D. SzychowskiAbstract:Aluminium hydroxide was precipitated during a hydrolysis of Aluminium perchlorate in ammonia medium. The materials were studied with the following methods: thermal analysis, IR spectroscopy, X-ray diffraction, low-temperature nitrogen adsorption and adsorption–desorption of benzene vapours.
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influence of Aluminium precursor on physico chemical properties of Aluminium Hydroxides and oxides
Journal of Thermal Analysis and Calorimetry, 2006Co-Authors: Barbara Pacewska, Olga Klukploskonska, D. SzychowskiAbstract:An attempt to obtain Aluminium hydroxide that could give Aluminium oxides of increased thermal stability was made. Aluminium hydroxide was precipitated during a hydrolysis of Aluminium chloride in ammonia medium. The influence of preparative conditions, such as a dosing rate of Aluminium precursor, pH, duration of the precipitate refluxing and temperature of calcination, on the properties of obtained Hydroxides and oxides was investigated. The materials were studied with the following methods: thermal analysis, IR spectroscopy, low-temperature nitrogen adsorption and adsorption–desorption of benzene vapours.
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influence of Aluminium precursor on physico chemical properties of Aluminium Hydroxides and oxides
Journal of Thermal Analysis and Calorimetry, 2006Co-Authors: Barbara Pacewska, Olga Klukploskonska, D. SzychowskiAbstract:The process of hydrolysis of aqueous Aluminium sulfate was carried on in ammonia medium at 100°C and for different time intervals (0, 20, 39 or 59 h). The products thus obtained were calcined at 550, 900 or 1200°C for 2 h with the aim to obtain Aluminium oxides. The materials were studied with the following methods: thermal analysis, IR spectroscopy, X-ray diffraction, low-temperature nitrogen adsorption, adsorption–desorption of benzene vapours and scanning electron microscopy.
Prashanth Suresh Kumar - One of the best experts on this subject based on the ideXlab platform.
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arsenic adsorption by iron Aluminium hydroxide coated onto macroporous supports insights from x ray absorption spectroscopy and comparison with granular ferric Hydroxides
Journal of Hazardous Materials, 2016Co-Authors: Prashanth Suresh Kumar, Roxana Quiroga Flores, Carin Sjostedt, Linda OnnbyAbstract:This paper evaluates the arsenic adsorption characteristics of a macroporous polymer coated with coprecipitated iron-Aluminium Hydroxides (MHCMP). The MHCMP adsorbent-composite fits best with a pseudo-second order model for As(III) and a pseudo-first order kinetic model for As(V). The MHCMP shows a maximum adsorption capacity of 82.3 and 49.6mgAs/g adsorbent for As(III) and As(V) ions respectively, and adsorption followed the Langmuir model. Extended X-ray absorption fine structure showed that binding of As(III) ions were confirmed to take place on the iron Hydroxides coated on the MHCMP, whereas for As(V) ions the binding specificity could not be attributed to one particular metal hydroxide. As(III) formed a bidentate mononuclear complex with Fe sites, whereas As(V) indicated on a bidentate binuclear complex with Al sites or monodentate with Fe sites on the adsorbent. The column experiments were run in a well water spiked with a low concentration of As(III) (100μg/L) and a commercially available adsorbent (GEH(®)102) based on granular iron-hydroxide was used for comparison. It was found that the MHCMP was able to treat 7 times more volume of well water as compared to GEH(®)102, maintaining the threshold concentration of less than 10μgAs/L, indicating that the MHCMP is a superior adsorbent. (Less)
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arsenic adsorption by iron Aluminium hydroxide coated onto macroporous supports insights from x ray absorption spectroscopy and comparison with granular ferric Hydroxides
Journal of Hazardous Materials, 2016Co-Authors: Prashanth Suresh Kumar, Roxana Quiroga Flores, Carin Sjostedt, Linda OnnbyAbstract:This paper evaluates the arsenic adsorption characteristics of a macroporous polymer coated with coprecipitated iron-Aluminium Hydroxides (MHCMP). The MHCMP adsorbent-composite fits best with a pseudo-second order model for As(III) and a pseudo-first order kinetic model for As(V). The MHCMP shows a maximum adsorption capacity of 82.3 and 49.6 mg As/g adsorbent for As(III) and As(V) ions respectively, and adsorption followed the Langmuir model. Extended X-ray absorption fine structure showed that binding of As(III) ions were confirmed to take place on the iron Hydroxides coated on the MHCMP, whereas for As(V) ions the binding specificity could not be attributed to one particular metal hydroxide. As(III) formed a bidentate mononuclear complex with Fe sites, whereas As(V) indicated on a bidentate binuclear complex with Al sites or monodentate with Fe sites on the adsorbent. The column experiments were run in a well water spiked with a low concentration of As(III) (100 μg/L) and a commercially available adsorbent (GEH(®)102) based on granular iron-hydroxide was used for comparison. It was found that the MHCMP was able to treat 7 times more volume of well water as compared to GEH(®)102, maintaining the threshold concentration of less than 10 μg As/L, indicating that the MHCMP is a superior adsorbent.