TY - JOUR
T1 - Mitigation of low methane content landfill gas through visible-near-infrared photocatalysis over Y 2 O 3 :Er 3+ /Graphene/TiO 2
AU - Tian, Xinmei
AU - Huang, Siyuan
AU - Wang, Luochun
AU - Li, Lin
AU - Lou, Ziyang
AU - Huang, Shouqiang
AU - Zhou, Zhen
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/10/31
Y1 - 2018/10/31
N2 - Untreated low methane (CH 4 ) content (less than 10%) landfill gas within the post-methanogenic stage is currently vented into the atmosphere, constituting an important source of anthropogenic greenhouse gas (GHG). Development of a proper mitigation process for low CH 4 gas is therefore necessary for landfills. In this study a special photocatalyst, Y 2 O 3 :Er 3+ -TiO 2 -0.05% graphene (GR), was synthesized by sol-gel method and then characterized; it showed a good response to visible-near-infrared (Vis–NIR) sunlight. The corresponding absorption edge was 354 nm, and upconversion fluorescence peaks of ultraviolet (364 nm) and violet (408 nm) emissions were acquired under 980 nm excitation. Y 2 O 3 :Er 3+ -TiO 2 -GR was developed and tested for removal of low CH 4 landfill gas under Vis–NIR light irradiation, and a maximum photodegradation rate of 45.1% for CH 4 was obtained using the photocatalyst Y 2 O 3 :Er 3+ -TiO 2 -0.05% GR with a light intensity of 2050 mW m −2 . The corresponding CH 4 content decreased from 10% to 5.5%, mitigating almost half of GHG during the post-methanogenic stage. The intermediate products of CH 4 degradation were CO, [rad] OH, O − , CO 2 and H 2 O traced by in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). This research proposes a new approach for reducing the GHG effect of low CH 4 content landfill gas.
AB - Untreated low methane (CH 4 ) content (less than 10%) landfill gas within the post-methanogenic stage is currently vented into the atmosphere, constituting an important source of anthropogenic greenhouse gas (GHG). Development of a proper mitigation process for low CH 4 gas is therefore necessary for landfills. In this study a special photocatalyst, Y 2 O 3 :Er 3+ -TiO 2 -0.05% graphene (GR), was synthesized by sol-gel method and then characterized; it showed a good response to visible-near-infrared (Vis–NIR) sunlight. The corresponding absorption edge was 354 nm, and upconversion fluorescence peaks of ultraviolet (364 nm) and violet (408 nm) emissions were acquired under 980 nm excitation. Y 2 O 3 :Er 3+ -TiO 2 -GR was developed and tested for removal of low CH 4 landfill gas under Vis–NIR light irradiation, and a maximum photodegradation rate of 45.1% for CH 4 was obtained using the photocatalyst Y 2 O 3 :Er 3+ -TiO 2 -0.05% GR with a light intensity of 2050 mW m −2 . The corresponding CH 4 content decreased from 10% to 5.5%, mitigating almost half of GHG during the post-methanogenic stage. The intermediate products of CH 4 degradation were CO, [rad] OH, O − , CO 2 and H 2 O traced by in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). This research proposes a new approach for reducing the GHG effect of low CH 4 content landfill gas.
KW - Graphene
KW - Low CH content landfill gas
KW - Mitigation process
KW - Photocatalyst
KW - Photodegradation mechanism of CH
KW - Upconversion
UR - https://www.scopus.com/pages/publications/85049048203
U2 - 10.1016/j.apsusc.2018.06.138
DO - 10.1016/j.apsusc.2018.06.138
M3 - 文章
AN - SCOPUS:85049048203
SN - 0169-4332
VL - 456
SP - 854
EP - 860
JO - Applied Surface Science
JF - Applied Surface Science
ER -