Materials are characterized with different analytical methods. For example

• material analysis: XRD, SEM, TEM-EDS, XPS,
• particle size, size distribution, etc:  BET, mastersizer, nanosizer,
• surface characteristics: zeta potential measurements,

Various analytical methods are available to follow the catalytic oxidation and to check the property of the solution. For example,

• concentration change: UV-vis, TOC, 
• detailed analysis, oxidation mechanism: GC-MS, 
• solution properties: pH mater, conductivity meter,