TY - JOUR
T1 - Uniform mesoporous carbon hollow microspheres imparted with surface-enriched gold nanoparticles enable fast flow adsorption and catalytic reduction of nitrophenols
AU - Zhou, Mengyuan
AU - Wei, Xiangru
AU - Zhang, Xiangcheng
AU - Gao, Xingmin
AU - Wang, Xiaoning
AU - Wu, Winston Duo
AU - Selomulya, Cordelia
AU - Wu, Zhangxiong
PY - 2019/3/1
Y1 - 2019/3/1
N2 - Adsorption and catalytic conversion of nitrophenols (NPs) over carbon-based materials have attracted wide interest. Batch adsorption and catalytic reduction of NPs have been widely reported, but less attention has been paid to flow systems, which require high particle size uniformity and superior active site accessibility. Herein, uniform mesoporous carbon hollow microspheres with their surfaces enriched by Au nanoparticles (denoted as Au@UMCHMs) are synthesized. The surface-enriched Au nanoparticle loading is promoted by the unique feature, that is, relatively dense external layers and mesoporous inner shells, of the carbon microspheres and the simple impregnation-reduction method. The Au@UMCHMs possess uniform sizes of ∼82 μm, small shell thickness of ∼5.8 μm, high specific surface area (∼1587 m2/g), and uniform mesopores (2.1 and 5.8 nm). They show excellent performance for flow adsorption and catalytic reduction of 4-nitrophenol (4-NP), superior to that of conventional Au-loaded carbon materials. In flow adsorption of 4-NP, the Au@UMCHMs show a fast and complete removal efficiency with high adsorption capacities (∼223 mg/g at breakthrough). They show outstanding performance in flow catalytic reduction of 4-NP. 4-NP with high concentrations (up to 100 mg/L) can be ultrafast and completely catalytically reduced to 4-aminophenol (4-AP) under rapid flow rates (up to ∼25 mL/min).
AB - Adsorption and catalytic conversion of nitrophenols (NPs) over carbon-based materials have attracted wide interest. Batch adsorption and catalytic reduction of NPs have been widely reported, but less attention has been paid to flow systems, which require high particle size uniformity and superior active site accessibility. Herein, uniform mesoporous carbon hollow microspheres with their surfaces enriched by Au nanoparticles (denoted as Au@UMCHMs) are synthesized. The surface-enriched Au nanoparticle loading is promoted by the unique feature, that is, relatively dense external layers and mesoporous inner shells, of the carbon microspheres and the simple impregnation-reduction method. The Au@UMCHMs possess uniform sizes of ∼82 μm, small shell thickness of ∼5.8 μm, high specific surface area (∼1587 m2/g), and uniform mesopores (2.1 and 5.8 nm). They show excellent performance for flow adsorption and catalytic reduction of 4-nitrophenol (4-NP), superior to that of conventional Au-loaded carbon materials. In flow adsorption of 4-NP, the Au@UMCHMs show a fast and complete removal efficiency with high adsorption capacities (∼223 mg/g at breakthrough). They show outstanding performance in flow catalytic reduction of 4-NP. 4-NP with high concentrations (up to 100 mg/L) can be ultrafast and completely catalytically reduced to 4-aminophenol (4-AP) under rapid flow rates (up to ∼25 mL/min).
KW - Flow adsorption
KW - Flow catalysis
KW - Gold nanoparticles
KW - Nitrophenol treatment
KW - Porous carbon microspheres
KW - Selective nanoparticle loading
UR - http://www.scopus.com/inward/record.url?scp=85056215963&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2018.11.004
DO - 10.1016/j.jcis.2018.11.004
M3 - Article
C2 - 30423485
AN - SCOPUS:85056215963
SN - 0021-9797
VL - 537
SP - 112
EP - 122
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
ER -