Response surface approach for visible light assisted photocatalytic degradation of ortho nitrophenol by magnetically separable TiO2/CS nanocomposite

• Main Authors: Afzal, Saba, Julkapli, Nurhidayatullaili Muhd, Lee, Kian Mun
• Format: Article
• Published: Elsevier 2019
• Subjects: QD Chemistry
• Online Access: http://eprints.um.edu.my/24313/; https://doi.org/10.1016/j.mssp.2019.04.022

Visible light induces photocatalytic degradation technology has gained increasing interest in the treatment of organic pollutants for the wastewater system. In this study, magnetically separable nanocomposite (M-TiO 2 /CS) was successfully synthesized with a narrow band gap (2.85 eV) than pure TiO 2 . A central composited design (CCD) coupled with response surface methodology (RSM) was effectively utilized to inquire about the photocatalytic degradation of ONP degradation by using M-TiO 2 /CS. Three independent factors including the M-TiO 2 /CS loading, initial ONP concentration, and pH of the solution were examined in details. Based on the results obtained from RSM analyses, an efficient pathway leading to the high degradation rate (92%) was achieved by applying 0.02 g of M-TiO 2 /CS dosage with 30 mg/L of a concentration of ONP at pH 6 for 180 min. The experimental results fit well with the derived response model (R 2 = 0.9789). The current study proposed a cost-effective and highly efficient approach to wastewater pollution issues. © 2019