TY - JOUR
T1 - Degradation efficiencies and mechanisms of the ZnO-mediated photocatalytic degradation of Basic Blue 11 under visible light irradiation
AU - Lu, Chungshin
AU - Wu, Yingtien
AU - Mai, Fuder
AU - Chung, Wenhsin
AU - Wu, Chiawei
AU - Lin, Wanyu
AU - Chen, Chiingchang
PY - 2009/9/1
Y1 - 2009/9/1
N2 - A ZnO-mediated photocatalysis process was used to successfully degrade Basic Blue 11 (BB-11) under visible light irradiation. The effects of influential factors like initial dye concentration, catalyst dosage, and initial pH were studied. To obtain a better understanding the mechanistic details of ZnO-assisted photodegradation of the BB-11 dye with low watt visible light irradiation, a large number of the intermediates resulting from the photodegradation were separated, identified, and characterized by high-performance liquid chromatography-photodiode array-mass spectrometry (HPLC-PDA-MS) techniques. The results indicated that the N-de-alkylation and oxidative degradation of BB-11 dye took place and that N-hydroxyalkylated intermediates were generated during the process. From the same identified intermediates we got under UV or visible light irradiation, it is proposed that the major oxidant under visible light irradiation was {radical dot}OH radical, not O2-{radical dot}. HPLC-PDA-MS analysis verified the identity of intermediates, and a reaction mechanism based on them was proposed.
AB - A ZnO-mediated photocatalysis process was used to successfully degrade Basic Blue 11 (BB-11) under visible light irradiation. The effects of influential factors like initial dye concentration, catalyst dosage, and initial pH were studied. To obtain a better understanding the mechanistic details of ZnO-assisted photodegradation of the BB-11 dye with low watt visible light irradiation, a large number of the intermediates resulting from the photodegradation were separated, identified, and characterized by high-performance liquid chromatography-photodiode array-mass spectrometry (HPLC-PDA-MS) techniques. The results indicated that the N-de-alkylation and oxidative degradation of BB-11 dye took place and that N-hydroxyalkylated intermediates were generated during the process. From the same identified intermediates we got under UV or visible light irradiation, it is proposed that the major oxidant under visible light irradiation was {radical dot}OH radical, not O2-{radical dot}. HPLC-PDA-MS analysis verified the identity of intermediates, and a reaction mechanism based on them was proposed.
KW - Basic Blue 11
KW - Dye
KW - HPLC-PDA-MS
KW - Photocatalytic
KW - ZnO
UR - http://www.scopus.com/inward/record.url?scp=67849119406&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=67849119406&partnerID=8YFLogxK
U2 - 10.1016/j.molcata.2009.06.011
DO - 10.1016/j.molcata.2009.06.011
M3 - Article
AN - SCOPUS:67849119406
SN - 1381-1169
VL - 310
SP - 159
EP - 165
JO - Journal of Molecular Catalysis A: Chemical
JF - Journal of Molecular Catalysis A: Chemical
IS - 1-2
ER -