Cheslin Moodley

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Questions related from Cheslin Moodley

How do you monitor the effect of contact time during batch adsorption experiments?

I'm currently investigating the adsorption of heavy metals from water matrices using bio-derived adsorbents. When investigating the effect of contact time, do you sample the solution at varying...

21 January 2025 3,574 4 View

How do I separate methylglyoxal (pyruvaldehyde) and pyruvic acid using RP-HPLC?

Using a Restek Roc C18 5um column and a mobile phase composed of H3PO4/NaH2PO4 buffer aqueous solution (0.1 M NaH2PO4 acidified by H3PO4 to pH +/-2) and acetonitrile (v:v = 9:1) [flow rate of 0.6...

07 June 2023 1,898 8 View

Why is a powder of Mn(NO3)2/SiO2 turning black in colour after oven drying at 90°C?

5 wt.% of Mn(NO3)2.4H2O was used as a precursor for the wet impregnation synthesis of MnOx/SiO2. After dehydration at 70 °C, a white paste was obtained and thereafter dried in an oven overnight at...

22 November 2022 8,931 3 View

Why is there an absence of peak/s in the NH3-TPD analysis of silica ?

The NH3-TPD of commercial silica (S.A= 223m2/g) has been run on a Micromeritics 2900 AutoChem II Chemisorption Analyser to determine total acidity. However, there was no peak observed post-run....

30 April 2020 2,392 3 View