Interfacial thermodynamics of gallic acid adsorption on a chargeable hydrophobic surface

Electrochemical interfacial adsorption mechanism of polyphenolic molecules onto Hanging Mercury Drop Electrode surface (HMDE)

“…Concretely, at temperatures T < 12°C, electro-adsorption is controlled by enthalpy, while at temperatures T > 22°C, entropy is driven. Within the temperature range 12°C and 22°C, a combined enthalpy-entropy stabilization occurs [31]. These findings constitute evidence of a complex mechanism of electro-adsorption reactions of polyphenolic molecules such as gallic acid with electrode surface of HMDE.…”

“…The temperature of the electrochemical cell was controlled by water circulation via a thermostated circulator operating in the temperature range of 2-50°C, as described previously [22,27,31]. The temperature was constantly monitored in situ in the measuring cell with a digital thermometer inserted through a sealed opening at the top cap of the measuring cell.…”

“…Recently, the interfacial thermodynamics of GA electro-adsorption on HMDE were investigated using Square Wave-Adsorption Cathodic Stripping Voltammetry (SW-AdCSV) at pH 7.5 [31]. The thermodynamic data showed a complex redox-mechanism of adsorption of GA on the electrode surface which is strongly dependent on temperature.…”

“…300 s. The apparent electrode coverage, h, inFig. 2was calculated by the known relation[22,23,27,31]:…”

Fouling prevention in the membrane distillation of phenolic-rich solution using superhydrophobic PVDF membrane incorporated with TiO2 nanoparticles

“…Pore plugging could occur on P-0 membrane due to the large pores [14]. The adsorption of gallic acid on hydrophobic surface is temperature dependent as reported by others [36]. In the hot feed, the fouling is controlled by enthalpy.…”