The Experts below are selected from a list of 96 Experts worldwide ranked by ideXlab platform

Othman Sulaiman - One of the best experts on this subject based on the ideXlab platform.

  • Optimized preparation for large surface area activated carbon from date (Phoenix dactylifera L.) stone biomass
    Biomass & Bioenergy, 2014
    Co-Authors: Mohammed Danish, Rokiah Hashim, Mohamad Nasir Mohamad Ibrahim, Othman Sulaiman
    Abstract:

    Abstract The preparation of activated carbon from date stone treated with phosphoric Acid was optimized using rotatable central composite design of response surface methodology (RSM). The chemical activating agent concentration and temperature of activation plays a crucial role in preparation of large surface area activated carbons. The optimized activated carbon was characterized using thermogravimetric analysis, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, powder X-ray diffraction, and Fourier transform infrared spectroscopy. The results showed that the larger surface area of activated carbon from date stone can be achieved under optimum activating agent (phosphoric Acid) concentration, 50.0% (8.674 mol L −1 ) and activation temperature, 900 °C. The Brunauer–Emmett–Teller (BET) surface area of optimized activated carbon was found to be 1225 m 2  g −1 , and thermogravimetric analysis revealed that 55.2% mass of optimized activated carbon was found thermally stable till 900 °C. The leading chemical functional groups found in the date stone activated carbon were aliphatic Carboxylic Acid Salt ʋ (C O) 1561.22 cm −1 and 1384.52 cm −1 , aliphatic hydrocarbons ʋ (C–H) 2922.99 cm −1 (C–H sym./asym. stretch frequency), aliphatic phosphates ʋ (P–O–C) 1054.09 cm −1 , and secondary aliphatic alcohols ʋ (O–H) 3419.81 cm −1 and 1159.83 cm −1 .

  • Optimized preparation for large surface area activated carbon from date (Phoenix dactylifera L.) stone biomass
    Biomass and Bioenergy, 2014
    Co-Authors: Mohammed Danish, Rokiah Hashim, M. A. Ibrahim, Othman Sulaiman
    Abstract:

    The preparation of activated carbon from date stone treated with phosphoric Acid was optimized using rotatable central composite design of response surface methodology (RSM). The chemical activating agent concentration and temperature of activation plays a crucial role in preparation of large surface area activated carbons. The optimized activated carbon was characterized using thermogravimetric analysis, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, powder X-ray diffraction, and Fourier transform infrared spectroscopy. The results showed that the larger surface area of activated carbon from date stone can be achieved under optimum activating agent (phosphoric Acid) concentration, 50.0% (8.674molL-1) and activation temperature, 900??C. The Brunauer-Emmett-Teller (BET) surface area of optimized activated carbon was found to be 1225m2g-1, and thermogravimetric analysis revealed that 55.2% mass of optimized activated carbon was found thermally stable till 900??C. The leading chemical functional groups found in the date stone activated carbon were aliphatic Carboxylic Acid Salt v{script}(CO) 1561.22cm-1 and 1384.52cm-1, aliphatic hydrocarbons v{script}(C-H) 2922.99cm-1 (C-H sym./asym. stretch frequency), aliphatic phosphates v{script}(P-O-C) 1054.09cm-1, and secondary aliphatic alcohols v{script}(O-H) 3419.81cm-1 and 1159.83cm-1. ?? 2013 Elsevier Ltd.

Mohammed Danish - One of the best experts on this subject based on the ideXlab platform.

  • Optimized preparation for large surface area activated carbon from date (Phoenix dactylifera L.) stone biomass
    Biomass & Bioenergy, 2014
    Co-Authors: Mohammed Danish, Rokiah Hashim, Mohamad Nasir Mohamad Ibrahim, Othman Sulaiman
    Abstract:

    Abstract The preparation of activated carbon from date stone treated with phosphoric Acid was optimized using rotatable central composite design of response surface methodology (RSM). The chemical activating agent concentration and temperature of activation plays a crucial role in preparation of large surface area activated carbons. The optimized activated carbon was characterized using thermogravimetric analysis, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, powder X-ray diffraction, and Fourier transform infrared spectroscopy. The results showed that the larger surface area of activated carbon from date stone can be achieved under optimum activating agent (phosphoric Acid) concentration, 50.0% (8.674 mol L −1 ) and activation temperature, 900 °C. The Brunauer–Emmett–Teller (BET) surface area of optimized activated carbon was found to be 1225 m 2  g −1 , and thermogravimetric analysis revealed that 55.2% mass of optimized activated carbon was found thermally stable till 900 °C. The leading chemical functional groups found in the date stone activated carbon were aliphatic Carboxylic Acid Salt ʋ (C O) 1561.22 cm −1 and 1384.52 cm −1 , aliphatic hydrocarbons ʋ (C–H) 2922.99 cm −1 (C–H sym./asym. stretch frequency), aliphatic phosphates ʋ (P–O–C) 1054.09 cm −1 , and secondary aliphatic alcohols ʋ (O–H) 3419.81 cm −1 and 1159.83 cm −1 .

  • Optimized preparation for large surface area activated carbon from date (Phoenix dactylifera L.) stone biomass
    Biomass and Bioenergy, 2014
    Co-Authors: Mohammed Danish, Rokiah Hashim, M. A. Ibrahim, Othman Sulaiman
    Abstract:

    The preparation of activated carbon from date stone treated with phosphoric Acid was optimized using rotatable central composite design of response surface methodology (RSM). The chemical activating agent concentration and temperature of activation plays a crucial role in preparation of large surface area activated carbons. The optimized activated carbon was characterized using thermogravimetric analysis, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, powder X-ray diffraction, and Fourier transform infrared spectroscopy. The results showed that the larger surface area of activated carbon from date stone can be achieved under optimum activating agent (phosphoric Acid) concentration, 50.0% (8.674molL-1) and activation temperature, 900??C. The Brunauer-Emmett-Teller (BET) surface area of optimized activated carbon was found to be 1225m2g-1, and thermogravimetric analysis revealed that 55.2% mass of optimized activated carbon was found thermally stable till 900??C. The leading chemical functional groups found in the date stone activated carbon were aliphatic Carboxylic Acid Salt v{script}(CO) 1561.22cm-1 and 1384.52cm-1, aliphatic hydrocarbons v{script}(C-H) 2922.99cm-1 (C-H sym./asym. stretch frequency), aliphatic phosphates v{script}(P-O-C) 1054.09cm-1, and secondary aliphatic alcohols v{script}(O-H) 3419.81cm-1 and 1159.83cm-1. ?? 2013 Elsevier Ltd.

Rokiah Hashim - One of the best experts on this subject based on the ideXlab platform.

  • Optimized preparation for large surface area activated carbon from date (Phoenix dactylifera L.) stone biomass
    Biomass & Bioenergy, 2014
    Co-Authors: Mohammed Danish, Rokiah Hashim, Mohamad Nasir Mohamad Ibrahim, Othman Sulaiman
    Abstract:

    Abstract The preparation of activated carbon from date stone treated with phosphoric Acid was optimized using rotatable central composite design of response surface methodology (RSM). The chemical activating agent concentration and temperature of activation plays a crucial role in preparation of large surface area activated carbons. The optimized activated carbon was characterized using thermogravimetric analysis, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, powder X-ray diffraction, and Fourier transform infrared spectroscopy. The results showed that the larger surface area of activated carbon from date stone can be achieved under optimum activating agent (phosphoric Acid) concentration, 50.0% (8.674 mol L −1 ) and activation temperature, 900 °C. The Brunauer–Emmett–Teller (BET) surface area of optimized activated carbon was found to be 1225 m 2  g −1 , and thermogravimetric analysis revealed that 55.2% mass of optimized activated carbon was found thermally stable till 900 °C. The leading chemical functional groups found in the date stone activated carbon were aliphatic Carboxylic Acid Salt ʋ (C O) 1561.22 cm −1 and 1384.52 cm −1 , aliphatic hydrocarbons ʋ (C–H) 2922.99 cm −1 (C–H sym./asym. stretch frequency), aliphatic phosphates ʋ (P–O–C) 1054.09 cm −1 , and secondary aliphatic alcohols ʋ (O–H) 3419.81 cm −1 and 1159.83 cm −1 .

  • Optimized preparation for large surface area activated carbon from date (Phoenix dactylifera L.) stone biomass
    Biomass and Bioenergy, 2014
    Co-Authors: Mohammed Danish, Rokiah Hashim, M. A. Ibrahim, Othman Sulaiman
    Abstract:

    The preparation of activated carbon from date stone treated with phosphoric Acid was optimized using rotatable central composite design of response surface methodology (RSM). The chemical activating agent concentration and temperature of activation plays a crucial role in preparation of large surface area activated carbons. The optimized activated carbon was characterized using thermogravimetric analysis, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, powder X-ray diffraction, and Fourier transform infrared spectroscopy. The results showed that the larger surface area of activated carbon from date stone can be achieved under optimum activating agent (phosphoric Acid) concentration, 50.0% (8.674molL-1) and activation temperature, 900??C. The Brunauer-Emmett-Teller (BET) surface area of optimized activated carbon was found to be 1225m2g-1, and thermogravimetric analysis revealed that 55.2% mass of optimized activated carbon was found thermally stable till 900??C. The leading chemical functional groups found in the date stone activated carbon were aliphatic Carboxylic Acid Salt v{script}(CO) 1561.22cm-1 and 1384.52cm-1, aliphatic hydrocarbons v{script}(C-H) 2922.99cm-1 (C-H sym./asym. stretch frequency), aliphatic phosphates v{script}(P-O-C) 1054.09cm-1, and secondary aliphatic alcohols v{script}(O-H) 3419.81cm-1 and 1159.83cm-1. ?? 2013 Elsevier Ltd.

M. A. Ibrahim - One of the best experts on this subject based on the ideXlab platform.

  • Optimized preparation for large surface area activated carbon from date (Phoenix dactylifera L.) stone biomass
    Biomass and Bioenergy, 2014
    Co-Authors: Mohammed Danish, Rokiah Hashim, M. A. Ibrahim, Othman Sulaiman
    Abstract:

    The preparation of activated carbon from date stone treated with phosphoric Acid was optimized using rotatable central composite design of response surface methodology (RSM). The chemical activating agent concentration and temperature of activation plays a crucial role in preparation of large surface area activated carbons. The optimized activated carbon was characterized using thermogravimetric analysis, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, powder X-ray diffraction, and Fourier transform infrared spectroscopy. The results showed that the larger surface area of activated carbon from date stone can be achieved under optimum activating agent (phosphoric Acid) concentration, 50.0% (8.674molL-1) and activation temperature, 900??C. The Brunauer-Emmett-Teller (BET) surface area of optimized activated carbon was found to be 1225m2g-1, and thermogravimetric analysis revealed that 55.2% mass of optimized activated carbon was found thermally stable till 900??C. The leading chemical functional groups found in the date stone activated carbon were aliphatic Carboxylic Acid Salt v{script}(CO) 1561.22cm-1 and 1384.52cm-1, aliphatic hydrocarbons v{script}(C-H) 2922.99cm-1 (C-H sym./asym. stretch frequency), aliphatic phosphates v{script}(P-O-C) 1054.09cm-1, and secondary aliphatic alcohols v{script}(O-H) 3419.81cm-1 and 1159.83cm-1. ?? 2013 Elsevier Ltd.

Rajiv Bhat - One of the best experts on this subject based on the ideXlab platform.

  • a mechanistic analysis of the increase in the thermal stability of proteins in aqueous Carboxylic Acid Salt solutions
    Protein Science, 2008
    Co-Authors: Jai K Kaushik, Rajiv Bhat
    Abstract:

    The stability of proteins is known to be affected significantly in the presence of high concentration of Salts and is highly pH dependent. Extensive studies have been carried out on the stability of proteins in the presence of simple electrolytes and evaluated in terms of preferential interactions and increase in the surface tension of the medium. We have carried out an in-depth study of the effects of a series of Carboxylic Acid Salts: ethylene diamine tetra acetate, butane tetra carboxylate, propane tricarballylate, citrate, succinate, tartarate, malonate, and gluconate on the thermal stability of five different proteins that vary in their physico-chemical properties: RNase A, cytochrome c, trypsin inhibitor, myoglobin, and lysozyme. Surface tension measurements of aqueous solutions of the Salts indicate an increase in the surface tension of the medium that is very strongly correlated with the increase in the thermal stability of proteins. There is also a linear correlation of the increase in thermal stability with the number of Carboxylic groups in the Salt. Thermal stability has been found to increase by as much as 22 C at 1 M concentration of Salt. Such a high thermal stability at identical concentrations has not been reported before. The differences in the heat capacities of denaturation, deltaCp for RNase A, deduced from the transition curves obtained in the presence of varying concentrations of GdmCl and that of Carboxylic Acid Salts as a function of pH, indicate that the nature of the solvent medium and its interactions with the two end states of the protein control the thermodynamics of protein denaturation. Among the physico-chemical properties of proteins, there seems to be an interplay of the hydrophobic and electrostatic interactions that lead to an overall stabilizing effect. Increase in surface free energy of the solvent medium upon addition of the Carboxylic Acid Salts appears to be the dominant factor in governing the thermal stability of proteins.