relation: https://khub.utp.edu.my/scholars/13196/
title: Silica�carbon quantum dots decorated titanium dioxide as sunlight-driven photocatalyst to diminish acetaminophen from aquatic environment
creator: Wongso, V.
creator: Chung, H.K.
creator: Sambudi, N.S.
creator: Sufian, S.
creator: Abdullah, B.
creator: Wirzal, M.D.H.
creator: Ang, W.L.
description: The presence of pharmaceutical compound (i.e., acetaminophen) in aquatic environment has been declared as environmental issue since researchers found that it has potential risk to human health. Photocatalytic process as a promising method for waste degradation commonly employs titanium dioxide, TiO2. However, TiO2 has narrow light absorption and rapid charge recombination resulting in ineffective photocatalytic activity. In this study, silica � carbon quantum dots (Si-CQDs) from rice husk are decorated into TiO2 matrix through facile mixing approach to minimize the limitations of TiO2. Preliminary studies regarding TiO2 transformation and Si-CQDs incorporation in various amount were systematically investigated. It is observed that 1 wt is the optimum amount of Si-CQDs in composite in order to maximize the photocatalytic ability of TiO2. Under sunlight irradiation, 1 wt Si-CQDs/TiO2 composite is able to completely degrade 5 mg/L of acetaminophen within 240 min (33.3  faster than pure TiO2). The excellent performance of the composite is attributed to synergistic effect of Si-CQDs addition on TiO2 surface, which acted as photo sensitizer and electron trapper. Si-CQDs extend light absorption of TiO2 by reducing band gap energy from 3.20 to 3.12 eV, as confirmed by UV�vis Diffuse Reflectance Spectroscopy (DRS) spectra. Photoluminescence (PL) spectra and N2 sorption isotherm reveal that Si-CQDs addition prolongs the lifetime of charge separation and improves surface area (17  larger than TiO2), respectively. The composite of Si-CQDs/TiO2 also demonstrates good stability which is beneficial for pharmaceutical waste removal in the future. © 2020 Elsevier B.V.
publisher: Elsevier B.V.
date: 2020
type: Article
type: PeerReviewed
identifier:   Wongso, V. and Chung, H.K. and Sambudi, N.S. and Sufian, S. and Abdullah, B. and Wirzal, M.D.H. and Ang, W.L.  (2020) Silica�carbon quantum dots decorated titanium dioxide as sunlight-driven photocatalyst to diminish acetaminophen from aquatic environment.  Journal of Photochemistry and Photobiology A: Chemistry, 394.   ISSN 10106030     
relation: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85081650849&doi=10.1016%2fj.jphotochem.2020.112436&partnerID=40&md5=e9b159a83f2e99b288004ace3ff41ae7
relation: 10.1016/j.jphotochem.2020.112436
identifier: 10.1016/j.jphotochem.2020.112436