Studies of surface properties of pure and modified by Mn2+ and Ni2+ ions of aluminium oxide samples using complex methods

• Published in: Journal of thermal analysis and calorimetry Vol. 94; no. 3; pp. 655 - 662
• Main Authors: Staszczuk, P., Majdan, M., Pikus, S., Sternik, D., Błachnio, M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Dordrecht Springer Netherlands 01.12.2008; Springer
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Exact sciences and technology; General and physical chemistry; Inorganic Chemistry; Ion-exchange; Measurement Science and Instrumentation; Other ion exchangers: preparations and properties; Physical Chemistry; Polymer Sciences; Surface physical chemistry; desorption energy; aluminium oxides; adsorption of ions; thermogravimetry Q-TG; surface properties; fractal dimensions; Nickel II Ions; Thermogravimetry; X ray; Dispersive spectrometry; X ray diffraction; Aluminium Oxides; Pore size; Adsorption; Fractal dimension; Energy dispersion; Surface properties; Thermal analysis; Porosity; Thermodynamic properties; Desorption energy; Physicochemical properties; Manganese II Ions
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-008-9369-4

Complex studies of physicochemical properties of pure and modified of aluminia oxides samples are presented. The presence of Mn 2+ and Ni 2+ modifiers on the aluminium oxide surface causes increase in water adsorption capacity and decrease in benzene and n -octane adsorption. This is due to decrease of specific surface area, volume and radius of pores as a result of surface impregnation and microcrystal formation during modification with manganese and nickel chlorides. Microcrystal formation on the surface and porosity decrease as confirmed by AFM, EDX and powder diffraction studies using automated diffractometer by step scanning. From the Q-TG and Q-DTG data, the energies of liquid desorption from the surface of the samples and the functions of desorption, energy distribution were calculated. High degree of nonlinearity of the functions resulting from great heterogeneity of the studied surface was found. Adsorption of cations creates more homogeneous surface in aluminium oxide, and it is responsible for the change in adsorbate molecule interaction energy and changes mechanism of adsorption and desorption as well as thickness and structure of the adsorbed film. From the experimental data some parameters characterizing adsorption properties and porosity of the studied samples were determined using the complex measuring methods (thermal analysis, sorptometry, porosimetry, AFM and EDX).