The Experts below are selected from a list of 11745 Experts worldwide ranked by ideXlab platform
Jyoti Mittal - One of the best experts on this subject based on the ideXlab platform.
-
adsorption of hazardous dye eosin yellow from aqueous solution onto waste material de oiled soya isotherm kinetics and bulk removal
Journal of Molecular Liquids, 2013Co-Authors: Alok Mittal, Damodar Jhare, Jyoti MittalAbstract:Abstract The main focus of this research is to develop a systematic method for the removal of a hazardous dye Eosin Yellow from its aqueous solutions by adsorption process. Eosin Yellow is an anionic halogen containing dye which belongs to Flouorescein class. During the batch studies it has been found that Eosin Yellow showed a decrease in adsorption over De-oiled Soya with increasing pH, while increase in concentration, temperature, amount of adsorbent and sieve size increased the adsorption of the dye over De-oiled Soya. The ongoing adsorption follows Langmuir, Freundlich, Tempkin and D–R adsorption isotherm models. On the basis of Langmuir constant values like Gibb's free energies at 30, 40 and 50 °C have been found as 23.43, 25.15 and 25.23 kJ mol − 1 respectively, while enthalpy and entropy of the adsorption process were calculated as 3.598 kJ mol − 1 and 66.277 JK − 1 mol − 1 , respectively. Kinetic studies reveal that pseudo second order kinetics is operative during the adsorption process and the rate constant for the process was close to 1 × 10 − 9 s·g·Mol − 1 at all the temperatures. The treatment of kinetic data further reveals that the ongoing adsorption proceeds via film diffusion process and adsorption of the dye is taking place mainly on the external surface of the De-oiled Soya. The pre exponential constant (D o ) and activation energy (E a ) have been found as 3.02 × 10 − 14 and 32.85 kJ mol − 1 respectively. Under the column studies various parameters like fractional capacity of column, mass flow rate, Percentage Saturation of column etc. have been evaluated and their values have been found as 0.9748, 0.044 mg/cm 2 /min and 98%, respectively. The recovery of the dye from the exhausted column was made by eluting dilute NaOH solution and almost 94% of the dye recovery was achieved.
-
batch and bulk removal of hazardous colouring agent rose bengal by adsorption techniques using bottom ash as adsorbent
RSC Advances, 2012Co-Authors: Alok Mittal, Vinod Kumar Gupta, Damodar Jhare, Jyoti MittalAbstract:Rose Bengal is a halogen-containing fluorescein water soluble dye, which is widely used for medical purposes. The dye, however, is highly toxic and can cause irritation, itching etc. to the human skin and eyes. It is therefore considered worthwhile to develop a systematic method for the removal of Rose Bengal by adsorption processes. The present investigation is devoted to batch as well as bulk removal of Rose Bengal. Under preliminary batch studies, adsorption isotherm measurements and kinetic studies were carried out, while for the bulk removal, a glass column was used as a fixed bed adsorber made up of Bottom Ash. Attempts were also made for the recovery of the dye from the exhausted Bottom Ash column by eluting dilute NaOH. The paper also presents a detailed procedure for activating Bottom Ash and its chemical and physical analysis. Rose Bengal showed a decrease in adsorption with increasing pH and conversely, increases in concentration, temperature, amount of adsorbent and sieve size increased the adsorption. Langmuir, Freundlich, Tempkin and D–R adsorption isotherm models were also verified, and on the basis of Langmuir constants thermodynamic parameters such as the Gibb's free energy, enthalpy and entropy of the adsorption were also calculated. A pseudo-second order process was found to operate during the adsorption. During column operations various parameters like fractional capacity of the column, mass flow rate, Percentage Saturation of column etc. were calculated. Desorption from the exhausted column gave almost 91% of dye recovery.
-
adsorption treatment and recovery of the hazardous dye brilliant blue fcf over bottom ash and de oiled soya
Journal of Colloid and Interface Science, 2006Co-Authors: Vinod Kumar Gupta, Lisha Krishnan, Alok Mittal, Jyoti MittalAbstract:Abstract Two waste materials—bottom ash, a power plant waste, and de-oiled soya, an agricultural waste—are meticulously and successfully used as adsorbent for the removal and recovery of a hazardous triphenylmethane dye, Brilliant Blue FCF. Both the materials were characterized by chemical analysis, IR, DTA, SEM and XRD studies. Their physical characteristics like surface area, porosity, density and loss on ignition were also determined. The adsorption of the dye over both materials was achieved under different pH, adsorbate concentration, sieve size, adsorbent dosage, contact time and temperature, etc. conditions. For both the systems Langmuir and Freundlich adsorption isotherm models were applied and, based on these models, useful thermodynamic parameters were calculated. For both the adsorbents, the kinetic measurements indicate that the adsorption process follows first order kinetics and film diffusion and particle diffusion mechanisms are operative at lower and higher concentrations, respectively, in each case. By percolating the dye solution through fixed-bed columns the bulk removal of the Brilliant Blue FCF was carried out and necessary parameters were determined to find out the Percentage Saturation of both the columns. Recovery of Brilliant Blue FCF was made by eluting dilute NaOH of pH 11 through each column.
Vinod Kumar Gupta - One of the best experts on this subject based on the ideXlab platform.
-
batch and bulk removal of hazardous colouring agent rose bengal by adsorption techniques using bottom ash as adsorbent
RSC Advances, 2012Co-Authors: Alok Mittal, Vinod Kumar Gupta, Damodar Jhare, Jyoti MittalAbstract:Rose Bengal is a halogen-containing fluorescein water soluble dye, which is widely used for medical purposes. The dye, however, is highly toxic and can cause irritation, itching etc. to the human skin and eyes. It is therefore considered worthwhile to develop a systematic method for the removal of Rose Bengal by adsorption processes. The present investigation is devoted to batch as well as bulk removal of Rose Bengal. Under preliminary batch studies, adsorption isotherm measurements and kinetic studies were carried out, while for the bulk removal, a glass column was used as a fixed bed adsorber made up of Bottom Ash. Attempts were also made for the recovery of the dye from the exhausted Bottom Ash column by eluting dilute NaOH. The paper also presents a detailed procedure for activating Bottom Ash and its chemical and physical analysis. Rose Bengal showed a decrease in adsorption with increasing pH and conversely, increases in concentration, temperature, amount of adsorbent and sieve size increased the adsorption. Langmuir, Freundlich, Tempkin and D–R adsorption isotherm models were also verified, and on the basis of Langmuir constants thermodynamic parameters such as the Gibb's free energy, enthalpy and entropy of the adsorption were also calculated. A pseudo-second order process was found to operate during the adsorption. During column operations various parameters like fractional capacity of the column, mass flow rate, Percentage Saturation of column etc. were calculated. Desorption from the exhausted column gave almost 91% of dye recovery.
-
a comparative investigation on adsorption performances of mesoporous activated carbon prepared from waste rubber tire and activated carbon for a hazardous azo dye acid blue 113
Journal of Hazardous Materials, 2011Co-Authors: Vinod Kumar Gupta, B M Gupta, Arshi Rastogi, Shilpi Agarwal, Arunima NayakAbstract:Abstract A mesoporous carbon developed from waste tire rubber, characterized by chemical analysis, FTIR, and SEM studies, was used as an adsorbent for the removal and recovery of a hazardous azo dye, Acid Blue 113. Surface area, porosity, and density were determined. The adsorption of the dye over the prepared adsorbent and a commercial activated carbon was achieved under different pH, adsorbate concentration, sieve size, adsorbent dosage, contact time and temperature conditions. Langmuir and Freundlich adsorption isotherm models were applied and thermodynamic parameters were calculated. Kinetic studies indicated that the adsorption process follow first order kinetics and particle diffusion mechanisms are operative. By percolating the dye solution through fixed-bed columns the bulk removal of the Acid Blue 113 was carried out and necessary parameters were determined to find out the Percentage Saturation of both the columns. Recovery of the dye was made by eluting 0.1 M NaOH through the column.
-
adsorption treatment and recovery of the hazardous dye brilliant blue fcf over bottom ash and de oiled soya
Journal of Colloid and Interface Science, 2006Co-Authors: Vinod Kumar Gupta, Lisha Krishnan, Alok Mittal, Jyoti MittalAbstract:Abstract Two waste materials—bottom ash, a power plant waste, and de-oiled soya, an agricultural waste—are meticulously and successfully used as adsorbent for the removal and recovery of a hazardous triphenylmethane dye, Brilliant Blue FCF. Both the materials were characterized by chemical analysis, IR, DTA, SEM and XRD studies. Their physical characteristics like surface area, porosity, density and loss on ignition were also determined. The adsorption of the dye over both materials was achieved under different pH, adsorbate concentration, sieve size, adsorbent dosage, contact time and temperature, etc. conditions. For both the systems Langmuir and Freundlich adsorption isotherm models were applied and, based on these models, useful thermodynamic parameters were calculated. For both the adsorbents, the kinetic measurements indicate that the adsorption process follows first order kinetics and film diffusion and particle diffusion mechanisms are operative at lower and higher concentrations, respectively, in each case. By percolating the dye solution through fixed-bed columns the bulk removal of the Brilliant Blue FCF was carried out and necessary parameters were determined to find out the Percentage Saturation of both the columns. Recovery of Brilliant Blue FCF was made by eluting dilute NaOH of pH 11 through each column.
Alok Mittal - One of the best experts on this subject based on the ideXlab platform.
-
adsorption of hazardous dye eosin yellow from aqueous solution onto waste material de oiled soya isotherm kinetics and bulk removal
Journal of Molecular Liquids, 2013Co-Authors: Alok Mittal, Damodar Jhare, Jyoti MittalAbstract:Abstract The main focus of this research is to develop a systematic method for the removal of a hazardous dye Eosin Yellow from its aqueous solutions by adsorption process. Eosin Yellow is an anionic halogen containing dye which belongs to Flouorescein class. During the batch studies it has been found that Eosin Yellow showed a decrease in adsorption over De-oiled Soya with increasing pH, while increase in concentration, temperature, amount of adsorbent and sieve size increased the adsorption of the dye over De-oiled Soya. The ongoing adsorption follows Langmuir, Freundlich, Tempkin and D–R adsorption isotherm models. On the basis of Langmuir constant values like Gibb's free energies at 30, 40 and 50 °C have been found as 23.43, 25.15 and 25.23 kJ mol − 1 respectively, while enthalpy and entropy of the adsorption process were calculated as 3.598 kJ mol − 1 and 66.277 JK − 1 mol − 1 , respectively. Kinetic studies reveal that pseudo second order kinetics is operative during the adsorption process and the rate constant for the process was close to 1 × 10 − 9 s·g·Mol − 1 at all the temperatures. The treatment of kinetic data further reveals that the ongoing adsorption proceeds via film diffusion process and adsorption of the dye is taking place mainly on the external surface of the De-oiled Soya. The pre exponential constant (D o ) and activation energy (E a ) have been found as 3.02 × 10 − 14 and 32.85 kJ mol − 1 respectively. Under the column studies various parameters like fractional capacity of column, mass flow rate, Percentage Saturation of column etc. have been evaluated and their values have been found as 0.9748, 0.044 mg/cm 2 /min and 98%, respectively. The recovery of the dye from the exhausted column was made by eluting dilute NaOH solution and almost 94% of the dye recovery was achieved.
-
batch and bulk removal of hazardous colouring agent rose bengal by adsorption techniques using bottom ash as adsorbent
RSC Advances, 2012Co-Authors: Alok Mittal, Vinod Kumar Gupta, Damodar Jhare, Jyoti MittalAbstract:Rose Bengal is a halogen-containing fluorescein water soluble dye, which is widely used for medical purposes. The dye, however, is highly toxic and can cause irritation, itching etc. to the human skin and eyes. It is therefore considered worthwhile to develop a systematic method for the removal of Rose Bengal by adsorption processes. The present investigation is devoted to batch as well as bulk removal of Rose Bengal. Under preliminary batch studies, adsorption isotherm measurements and kinetic studies were carried out, while for the bulk removal, a glass column was used as a fixed bed adsorber made up of Bottom Ash. Attempts were also made for the recovery of the dye from the exhausted Bottom Ash column by eluting dilute NaOH. The paper also presents a detailed procedure for activating Bottom Ash and its chemical and physical analysis. Rose Bengal showed a decrease in adsorption with increasing pH and conversely, increases in concentration, temperature, amount of adsorbent and sieve size increased the adsorption. Langmuir, Freundlich, Tempkin and D–R adsorption isotherm models were also verified, and on the basis of Langmuir constants thermodynamic parameters such as the Gibb's free energy, enthalpy and entropy of the adsorption were also calculated. A pseudo-second order process was found to operate during the adsorption. During column operations various parameters like fractional capacity of the column, mass flow rate, Percentage Saturation of column etc. were calculated. Desorption from the exhausted column gave almost 91% of dye recovery.
-
adsorption treatment and recovery of the hazardous dye brilliant blue fcf over bottom ash and de oiled soya
Journal of Colloid and Interface Science, 2006Co-Authors: Vinod Kumar Gupta, Lisha Krishnan, Alok Mittal, Jyoti MittalAbstract:Abstract Two waste materials—bottom ash, a power plant waste, and de-oiled soya, an agricultural waste—are meticulously and successfully used as adsorbent for the removal and recovery of a hazardous triphenylmethane dye, Brilliant Blue FCF. Both the materials were characterized by chemical analysis, IR, DTA, SEM and XRD studies. Their physical characteristics like surface area, porosity, density and loss on ignition were also determined. The adsorption of the dye over both materials was achieved under different pH, adsorbate concentration, sieve size, adsorbent dosage, contact time and temperature, etc. conditions. For both the systems Langmuir and Freundlich adsorption isotherm models were applied and, based on these models, useful thermodynamic parameters were calculated. For both the adsorbents, the kinetic measurements indicate that the adsorption process follows first order kinetics and film diffusion and particle diffusion mechanisms are operative at lower and higher concentrations, respectively, in each case. By percolating the dye solution through fixed-bed columns the bulk removal of the Brilliant Blue FCF was carried out and necessary parameters were determined to find out the Percentage Saturation of both the columns. Recovery of Brilliant Blue FCF was made by eluting dilute NaOH of pH 11 through each column.
Damodar Jhare - One of the best experts on this subject based on the ideXlab platform.
-
adsorption of hazardous dye eosin yellow from aqueous solution onto waste material de oiled soya isotherm kinetics and bulk removal
Journal of Molecular Liquids, 2013Co-Authors: Alok Mittal, Damodar Jhare, Jyoti MittalAbstract:Abstract The main focus of this research is to develop a systematic method for the removal of a hazardous dye Eosin Yellow from its aqueous solutions by adsorption process. Eosin Yellow is an anionic halogen containing dye which belongs to Flouorescein class. During the batch studies it has been found that Eosin Yellow showed a decrease in adsorption over De-oiled Soya with increasing pH, while increase in concentration, temperature, amount of adsorbent and sieve size increased the adsorption of the dye over De-oiled Soya. The ongoing adsorption follows Langmuir, Freundlich, Tempkin and D–R adsorption isotherm models. On the basis of Langmuir constant values like Gibb's free energies at 30, 40 and 50 °C have been found as 23.43, 25.15 and 25.23 kJ mol − 1 respectively, while enthalpy and entropy of the adsorption process were calculated as 3.598 kJ mol − 1 and 66.277 JK − 1 mol − 1 , respectively. Kinetic studies reveal that pseudo second order kinetics is operative during the adsorption process and the rate constant for the process was close to 1 × 10 − 9 s·g·Mol − 1 at all the temperatures. The treatment of kinetic data further reveals that the ongoing adsorption proceeds via film diffusion process and adsorption of the dye is taking place mainly on the external surface of the De-oiled Soya. The pre exponential constant (D o ) and activation energy (E a ) have been found as 3.02 × 10 − 14 and 32.85 kJ mol − 1 respectively. Under the column studies various parameters like fractional capacity of column, mass flow rate, Percentage Saturation of column etc. have been evaluated and their values have been found as 0.9748, 0.044 mg/cm 2 /min and 98%, respectively. The recovery of the dye from the exhausted column was made by eluting dilute NaOH solution and almost 94% of the dye recovery was achieved.
-
batch and bulk removal of hazardous colouring agent rose bengal by adsorption techniques using bottom ash as adsorbent
RSC Advances, 2012Co-Authors: Alok Mittal, Vinod Kumar Gupta, Damodar Jhare, Jyoti MittalAbstract:Rose Bengal is a halogen-containing fluorescein water soluble dye, which is widely used for medical purposes. The dye, however, is highly toxic and can cause irritation, itching etc. to the human skin and eyes. It is therefore considered worthwhile to develop a systematic method for the removal of Rose Bengal by adsorption processes. The present investigation is devoted to batch as well as bulk removal of Rose Bengal. Under preliminary batch studies, adsorption isotherm measurements and kinetic studies were carried out, while for the bulk removal, a glass column was used as a fixed bed adsorber made up of Bottom Ash. Attempts were also made for the recovery of the dye from the exhausted Bottom Ash column by eluting dilute NaOH. The paper also presents a detailed procedure for activating Bottom Ash and its chemical and physical analysis. Rose Bengal showed a decrease in adsorption with increasing pH and conversely, increases in concentration, temperature, amount of adsorbent and sieve size increased the adsorption. Langmuir, Freundlich, Tempkin and D–R adsorption isotherm models were also verified, and on the basis of Langmuir constants thermodynamic parameters such as the Gibb's free energy, enthalpy and entropy of the adsorption were also calculated. A pseudo-second order process was found to operate during the adsorption. During column operations various parameters like fractional capacity of the column, mass flow rate, Percentage Saturation of column etc. were calculated. Desorption from the exhausted column gave almost 91% of dye recovery.
Ronan O’driscoll - One of the best experts on this subject based on the ideXlab platform.
-
Relating oxygen partial pressure, Saturation and content: the haemoglobin–oxygen dissociation curve
European Respiratory Society, 2015Co-Authors: Julie-ann Collins, Aram Rudenski, John Gibson, Luke Howard, Ronan O’driscollAbstract:Key Points In clinical practice, the level of arterial oxygenation can be measured either directly by blood gas sampling to measure partial pressure (PaO2) and Percentage Saturation (SaO2) or indirectly by pulse oximetry (SpO2).; This review addresses the strengths and weaknesses of each of these tests and gives advice on their clinical use.; The haemoglobin–oxygen dissociation curve describing the relationship between oxygen partial pressure and Saturation can be modelled mathematically and routinely obtained clinical data support the accuracy of a historical equation used to describe this relationship.; Educational Aims To understand how oxygen is delivered to the tissues.; To understand the relationships between oxygen Saturation, partial pressure, content and tissue delivery.; The clinical relevance of the haemoglobin–oxygen dissociation curve will be reviewed and we will show how a mathematical model of the curve, derived in the 1960s from limited laboratory data, accurately describes the relationship between oxygen Saturation and partial pressure in a large number of routinely obtained clinical samples.; To understand the role of pulse oximetry in clinical practice.; To understand the differences between arterial, capillary and venous blood gas samples and the role of their measurement in clinical practice.; The delivery of oxygen by arterial blood to the tissues of the body has a number of critical determinants including blood oxygen concentration (content), Saturation (SO2) and partial pressure, haemoglobin concentration and cardiac output, including its distribution. The haemoglobin–oxygen dissociation curve, a graphical representation of the relationship between oxygen saturation and oxygen partial pressure helps us to understand some of the principles underpinning this process. Historically this curve was derived from very limited data based on blood samples from small numbers of healthy subjects which were manipulated in vitro and ultimately determined by equations such as those described by Severinghaus in 1979. In a study of 3524 clinical specimens, we found that this equation estimated the SO2 in blood from patients with normal pH and SO2 >70% with remarkable accuracy and, to our knowledge, this is the first large-scale validation of this equation using clinical samples. Oxygen Saturation by pulse oximetry (SpO2) is nowadays the standard clinical method for assessing arterial oxygen Saturation, providing a convenient, pain-free means of continuously assessing oxygenation, provided the interpreting clinician is aware of important limitations. The use of pulse oximetry reduces the need for arterial blood gas analysis (SaO2) as many patients who are not at risk of hypercapnic respiratory failure or metabolic acidosis and have acceptable SpO2 do not necessarily require blood gas analysis. While arterial sampling remains the gold-standard method of assessing ventilation and oxygenation, in those patients in whom blood gas analysis is indicated, arterialised capillary samples also have a valuable role in patient care. The clinical role of venous blood gases however remains less well defined