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Role of bentonite adsorbent sub-layer in the photocatalytic-adsorptive removal of methylene blue by the immobilized TiO2/bentonite system
被引:24
|作者:
Ngoh, Y. S.
[1
]
Nawi, M. A.
[1
]
机构:
[1] Univ Sains Malaysia, Sch Chem Sci, Minden 11800, Penang, Malaysia
关键词:
Kinetics;
Bentonite;
Immobilization;
Methylene blue;
TiO2;
AQUEOUS-SOLUTION;
POLY(VINYL ALCOHOL);
CARBON NANOTUBES;
IRON-OXIDE;
DYE;
DEGRADATION;
TIO2;
MONTMORILLONITE;
CLAY;
COMPOSITES;
D O I:
10.1007/s13762-015-0928-5
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
An immobilized clay composite (BEN-PVAG) on a glass plate (GP) was fabricated using bentonite powder (BEN) and glutaraldehyde cross-linked polyvinyl alcohol (PVAG) as the adsorbent and adhesive, respectively. The immobilized bentonite composite (BEN-PVAG) was characterized using SEM, EDX, FTIR, and BET analysis. The adsorption capacity of BEN-PVAG was examined using methylene blue (MB) as the model pollutant. The results indicated that the adsorption of MB onto BEN-PVAG obeyed pseudo-second-order kinetics. In addition, the adsorption of MB by the immobilized BEN-PVAG was controlled by intra-particle diffusion. In contrast, the adsorption of MB by the suspended BEN-PVAG composite was dominated by film diffusion. The immobilized BEN-PVAG was then applied as the adsorbent sub-layer for the fabrication of P-25TiO(2)/BEN-PVAG/GP bilayer system where P-25TiO(2) was deposited as the top layer. The fabricated bilayer system exhibited synergistic photocatalytic-adsorptive removal of MB upon irradiation with a light source, while experiment in the dark yielded only adsorption process. The rate of the synergistic photocatalytic-adsorptive removal of MB by the P-25TiO(2)/BEN-PVAG/GP was 5.3 times faster than the suspended P-25TiO(2). The result implied the positive impact of the BEN-PVAG adsorbent sub-layer on the immobilized P-25TiO(2) photocatalyst. Most important, the immobilized P-25TiO(2)/BEN-PVAG/GP provided a convenient reuse of the catalyst over time where the treated water could be directly discharged without the need of filtration.
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页码:907 / 926
页数:20
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