期刊
WATER RESEARCH
卷 77, 期 -, 页码 179-190出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2015.03.014
关键词
Graphene oxide; Photocatalytic membranes; Filtration; Water purification; Salty water; Anti-fouling
资金
- FEDER (Fundo Europeu de Desenvolvimento Regional) through ON2 (Programa Operacional do Norte) [NORTE-07-0202-FEDER-038900]
- QREN
- FCT (Fundacao para a Ciencia e a Tecnologia)
- FEDER through Programme COMPETE [FCOMP-01-0124-FEDER-019503]
- FCT/MEC
- FEDER [PT2020, UID/EQU/50020/2013, NORTE-07-0124-FEDER-000015]
- ON2
- FCT [SFRH/BPD/88964/2012, SFRH/BPD/74239/2010, IF/01501/2013]
- European Social Fund
- Human Potential Operational Programme
- [PTDC/AAC-AMB/122312/2010]
- Fundação para a Ciência e a Tecnologia [PTDC/AAC-AMB/122312/2010, SFRH/BPD/88964/2012, SFRH/BPD/74239/2010] Funding Source: FCT
Flat sheet ultrafiltration (UF) membranes with photocatalytic properties were prepared with lab-made TiO2 and graphene oxide-TiO2 (GOT), and also with a reference TiO2 photocatalyst from Evonik (P25). These membranes were tested in continuous operation mode for the degradation and mineralization of a pharmaceutical compound, diphenhydramine (DP), and an organic dye, methyl orange (MO), under both near-LIVNis and visible light irradiation. The effect of NaCl was investigated considering simulated brackish water (NaCl 0.5 g L-1) and simulated seawater (NaCl 35 g L-1). The results indicated that the membranes prepared with the GOT composite (M-GOT) exhibited the highest photocatalytic activity, outperforming those prepared with bare TiO2 (M-TiO2) and P25 (M-P25), both inactive under visible light illumination. The best performance of M-GOT may be due to the lower band-gap energy (2.9 eV) of GOT. In general, the permeate flux was also higher for M-GOT probably due to a combined effect of its highest photocatalytic activity, highest hydrophilicity (contact angles of 11 degrees, 17 degrees and 18 degrees for M-GOT, M-TiO2 and M-P25, respectively) and higher porosity (71%). The presence of NaCl had a detrimental effect on the efficiency of the membranes, since chloride anions can act as hole and hydroxyl radical scavengers, but it did not affect the catalytic stability of these membranes. A hierarchically ordered membrane was also prepared by intercalating a freestanding GO membrane in the structure of the M-GOT membrane (M-GO/GOT). The results showed considerably higher pollutant removal in darkness and good photocatalytic activity under near-LTVNis and visible light irradiation in continuous mode experiments. (c) 2015 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据