Chemical structure, degree and supplier of the utilized chemicals.
| Reagents and chemicals | Chemical structure | Degree | Company |
|---|---|---|---|
| Sulphuric acid | H2SO4 | 98% | Sigma-Aldrich, UK |
| Phosphoric acid | H3PO4 | 85% | Sigma-Aldrich, UK |
| Hydrochloric acid | HCl | 36.5% | Sigma-Aldrich, UK |
| Ethanol | C2H5OH | Analytical grade | Sigma-Aldrich, UK |
| Methanol | CH3OH | Analytical grade | Sigma-Aldrich, UK |
| Potassium permanganate | KMnO4 | Analytical grade | WINLAB, UK |
| Sodium hydroxide | NaOH | Analytical grade | WINLAB, UK |
| Ethylene diamine tetraacetic acid (EDTA) |
|
Analytical grade | WINLAB, UK |
| Chitosan (CS) |
|
Degree of acetylation: more than 85% | Meron Biopolymers Company, India |
| Hydrogen peroxide | H2O2 | 30% | Alfa Company, India |
| Graphite fine powder |
|
Particles size ˂50 μm | Merck Company, Germany |