Thermochemical data for interaction of some primary amines with complexed mercury on mercapto-modified silica gel

Interaction of Ag(I), Hg(II), and Cu(II) with 1,2-ethanedithiol immobilized on chitosan: Thermochemical data from isothermal calorimetry

“…Recent studies [41,42] and other experiments in progress in our laboratory have demonstrated that values derived from saturation energies and fit of the Langmuir isotherm provide similar description of the adsorption properties. The negative interaction enthalpies are consistent with results obtained from titration calorimetry for adsorption on thiol-modified silica gel [30][31][32][33].…”

“…Interactions between the Lewis-acidic cations and the sulfur-donor atoms attached to chitosan are reflected by mon H m values in the sequence Cu(II) > Ag(I) > Hg(II). However, based on our previous studies [30][31][32][33], it was established that this thermodynamic quantity must be only considered to evaluate the acid-base interaction when the same coverage is achieved for adsorption of all cations. It was assumed because, in lower coverage, interactions occur with the most energetic sites, yielding greater mon H m values than those at a higher coverage.…”

“…Calorimetric techniques have contributed much to our understanding of adsorption phenomena at solid-solution interfaces. Some of our papers [30][31][32][33] develop an improved calorimetric titration method to obtain energies evolved at different surface coverages and the corresponding amount of substance bound. In this survey, isothermal microcalorimetry was used to determine enthalpy change upon interaction of Ag(I), Hg(II), and Cu(II) with QTDT.…”

Flow microcalorimetry: Experimental development and application to adsorption of heavy metal cations on silica

“…Most of these calorimetric studies are usually performed using large amount of cations adsorbed on the surfaces of modified silica [15][16][17][18][19][20][21][22][23], ion exchanger resins [24], soils [25,26] or minerals [27,28]. In these systems, the heat related to the adsorption process is substantial and easily measurable.…”

Measurement of cation binding to immobilized vanillin by isothermal calorimetry

“…Some of our papers [1][2][3][4] have developed an improved calorimetric titration method to obtain energies evolved at different surface coverages and the corresponding amount of substance bound. Much isothermal calorimetry has been done on adsorption of heavy metals [5][6][7][8], an area stimulated by problems of practical importance such as adsorption by soil of highly toxic solutions.…”