Mo c14h14n3nao3s

Titanium(IV) butoxide [Ti(C₄H₉O)₄, 97%], MB (C₁₆H₁₈C_lN₃S), MO (C₁₄H₁₄N₃NaO₃S), and various reagents were acquired from Sigma-Aldrich
(USA) and utilized without undergoing additional purification. In
every experiment, ultrapure water was utilized. κ-carrageenan
was obtained from Niche Centers in the Region (NICER) R&D Seaweed
Research and Development Center, Mindanao State University in Tawi–Tawi,
Sanga–Sanga, Bongao, Tawi–Tawi, Philippines.

Coconut husk fiber was collected from Mo Cay Nam district, Ben Tre province. After the coconuts were picked, the insides were separated from the shells. Then, the coconuts were crushed and dried and the weakened fiber was removed from the coconut shells. Finally, the coconuts were split into coconut fiber. Coconut fiber is 10–20 cm long, yellowish-brown in color, and twisted together, which was crushed into powder. Formic acid (HCOOH, 90%), hydroperoxide (H₂O₂, 30%), sodium hydroxide (NaOH, 96%), hydrochloric acid (HCl, 37%), urea ((NH₂)₂CO, ≥99%), ethylene glycol (HOCH₂CH₂OH, ≥99%), ethanol (C₂H₅OH, 99,5%), and two precursors of Fe and Ag (iron(III) chloride hexahydrate (FeCl₃.6H₂O, 97%) and silver nitrate (AgNO₃, 99%)) were purchased from XiLong, China. MO (C₁₄H₁₄N₃NaO₃S, ≥95%), MB (C₁₆H₁₈N₃SCl, ≥95%), sodium borohydride (NaBH₄, ≥99%), and 4-NP (≥99%) were purchased from Sigma-Aldrich. All the chemicals and reagents were used as received without further purification.