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.
引用
收藏
页码:907 / 926
页数:20
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