The Adsorption of 2‐Ketogluconate by Goethite

Abstract

Many long hours of study and research have placed me at this point in my career, though I would be remiss if I failed to acknowledge those who helped guide and encourage my progress. First, I would like to acknowledge my Major Professor, Dr. Michael Essington, who has been both my friend and mentor. My gratitude must also be extended to my committee members, Dr. Mark Radosevich and Dr. Amy Johnson, for their support. Special thanks must go to Galina Melnichenko, without whose kindness and knowledge I would be lost. Thank you, Galina, for always being willing to help me work a problem through to a solution. I must also acknowledge my family and friends, whose love and encouragement has always been my shelter: my mother Virginia Jean Journey, who never lets me quit; my grandparents Thomas and Jean Journey; my grandmother Imma Lorene Bentley; my aunt Aurora Anne Daniels; and my best friends Amanda Odessa Beckner and Jennifer Lauren Webster, who have been like sisters to me. Finally, my thanks go out to all of those friends not mentioned who have never failed to show me love and support. I could never have come this far without you.

Kinetics of oxytetracycline sorption on magnetite nanoparticles

“…The enthalpy of sorption (DH ad ) calculated from the van't Hoff equation (Eq. 9) resulted in a large and positive value for both I s. A large positive value of DH ad is indicative of inner-sphere surface complexation (Journey et al 2010). An exact magnitude of DH ad to separate innerand outer-sphere sorption has not yet been established (Journey et al 2010).…”

“…9) resulted in a large and positive value for both I s. A large positive value of DH ad is indicative of inner-sphere surface complexation (Journey et al 2010). An exact magnitude of DH ad to separate innerand outer-sphere sorption has not yet been established (Journey et al 2010). Likewise, if TDS ad is a large contributor to DG ad compared to DH ad , the sorption reaction is thought to be driven by entropy and via chemisorption (Journey et al 2010).…”

“…An exact magnitude of DH ad to separate innerand outer-sphere sorption has not yet been established (Journey et al 2010). Likewise, if TDS ad is a large contributor to DG ad compared to DH ad , the sorption reaction is thought to be driven by entropy and via chemisorption (Journey et al 2010). The DS ad value in Table 2 suggested that the OTC sorption by magnetite was entropically driven.…”

Competitive adsorption of metal ions onto goethite–humic acid-modified kaolinite clay

“…This simply implies that the innersphere adsorption sites at the edges of the kaolinite reported by Srivastava et al (2005) may have been used up for modification or possibly 'blocked' by the modifying reagent such that these cations are not able to access them. Outersphere complexation occurs via weak electrostatic bonds requiring ions existing in close proximity to one another on the surface (Journey et al 2010). From DS ad values in ) was observed to be fairly spontaneous (-DG ad ) in both metal ion systems with reduced spontaneity for adsorption in the Quinary metal ion system (Table 4).…”

“…7 Nonlinear equilibrium model plots for the adsorption of metal ions onto GHA-modified kaolinite from Single metal ion system a Langmuir, b Freundlich, c two-site Langmuir and d LangmuirFreundlich model plots; from Quinary metal ion system, e Langmuir, f Freundlich, g two-site Langmuir and h Langmuir-Freundlich model plots information about the adsorption reaction and mechanism of possible ligand retention. The small but positive adsorption enthalpy are strong indications that the outersphere complexation mechanism may have played a major role in the adsorption of these metal ions GHA-modified kaolinite in both Single and Quinary metal ion systems (Journey et al 2010). This simply implies that the innersphere adsorption sites at the edges of the kaolinite reported by Srivastava et al (2005) may have been used up for modification or possibly 'blocked' by the modifying reagent such that these cations are not able to access them.…”