Chn analyzer 2400 2

Potentiometric measurements were carried out by using Lab pH meter inoLab^® pH 7110 (WTW, Weilheim, Germany). Model InLab Reference—51,343,190 (Mettler-Toledo GmbH, Schwerzenbach, Switzerland) was used as an external Ag/AgCl electrode. As in the previously published material [38 (link)], the authors performed all potentiometric measurements in an electrochemical cell as follows:
Ag/AgCl (saturated)//sample solution/carbon paste/stainless steel rod.
Electrode InLab Expert Pro (Mettler Toledo GmbH, Greifensee, Switzerland) was used as pH electrode, while pH/mV meter model Seven Easy (Mettler-Toledo, GmbH, Schwerzenbach, Switzerland) was used for pH measurements and adjustments. EcoStir (DLAB Scientific Co., Ltd., Beijing, China) was used as magnetic stirrer.
CHN analyses were performed on a Perkin-Elmer CHN Analyzer 2400 II.

Morphology characterization of graphite oxide (GO) and rGO was performed using a scanning field emission electron microscope Zeiss ULTRA plus FE-SEM (Jena, Germany). SEM images were acquired at 2 kV using InLens or SE2 detector at WD 5.5 mm. Elemental analysis of the samples was done inside SEM using EDS analysis with an Oxford X-Max SDD detector (Wycombe, UK), processed with INCA software (Wycombe, UK). EDS analysis was carried out at 20 kV.
Specific surface area (m²/g) was measured by N₂ adsorption at 77 K on an ASAP 2020 Micromeritics (Norcross, GA, USA) instrument using the BET analysis method. Samples were degassed under vacuum (5 millitorr) at 120 °C for 2 h.
Microanalyses were performed by combustion analysis on a Perkin-Elmer CHN Analyzer 2400 II.
Potentiometric measurements were performed using the digital pH/mV meter model Seven Easy (Mettler-Toledo, GmbH, Schwerzenbach, Switzerland). The electrochemical cell was completed with an external Ag/AgCl reference electrode, model InLab^® Reference—51343190 (Mettler-Toledo GmbH, Schwerzenbach, Switzerland). A Premium hotplate stirrer model MSH-20A (Witeg Labortechnik, GmbH, Wertheim, Germany) was used for stirring the solutions.
Measurements of the pH values of the solutions were performed using a pH electrode InLab Expert Pro (Mettler Toledo GmbH, Greifensee, Switzerland).

Microanalyses were performed by combustion analysis on a Perkin-Elmer CHN Analyzer 2400 II, Rodgau, Germany.