Catalytic Reduction of 4-Nitrophenol to 4-Aminophenol using Chitosan Ag-TiO2 Nanocomposite and its Applications in the Removal of Malachite Green by Photodegradation Technique

N. Anusuya1,, C. Pragathiswaran2,* and J. Violet Mary2

1Department of Chemistry, Cauvery College for Women (Affiliated to Bharathidasan University, Thiruchirappalli), Tiruchirappalli-620018, India

2Department of Chemistry, Periyar E.V.R. College (Affiliated to Bharathidasan University, Thiruchirappalli), Thiruchirappalli-620023, India

*Corresponding author: E-mail:


A simple colloidal processing method was used to synthesize chitosan Ag-TiO2 nanocomposite and its use aimed at the catalytic reduction of 4-nitrophenol to 4-aminophenol in the presence of NaBH4 as reductant. The nanocomposite catalyst was characterized using different technquies and revealed its better catalytic ability than pure TiO2. Since the nanocomposites are readily improved from the solution phase without centrifugation or filtration. The catalytic activity trials were examined by changing the catalyst dose, concentration of NaBH4, amount of nitrobenzene and temperature. The reduction reactions were affected by the temperature of reaction medium and the concentration of NaBH4. The photodegradation conditions were optimized by changing different parameters such as irradiation time, dosage, pH and initial dye concentration.


Chitosan, 4-Nitrophenol, 4-Aminophenol, Nanocomposite, Malachite Green, Photodegradation.

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