Photocatalytic Performance and Mechanism Research of Ag/HSTiO₂ on Degradation of Methyl Orange

Abstract

The Sol–gel method is successfully used to prepare high specific surface area TiO 2 (HSTiO 2 ). Then, the photodeposition method is used to composite silver particles with HSTiO 2 . X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer–Emmett–Teller, and UV–vis spectroscopy are used to characterize the Ag/HSTiO 2 nanocomposites. It can be concluded that the prepared TiO 2 has a large specific surface area, reaching 125.5 m 2 g –1 . Additionally, the addition of silver particles successfully broadens the photoresponse range from the UV region to the visible light region. In order to evaluate the photocatalytic activity of Ag/HSTiO 2 , we conducted the methyl orange degradation test. The results showed that the photocatalytic activity of the sample is significantly higher than that of pure TiO 2 .

Diatom Biosilica Doped with Palladium(II) Chloride Nanoparticles as New Efficient Photocatalysts for Methyl Orange Degradation

“…Similarly, high efficiency (95-99%) of MO photocatalytic degradation was achieved using Pt modified with TiO 2 [73], Ag/HSTiO 2 [74], chitosan with immobilized nano-CdS [64], TiO 2 -CuZSM-5 [75], scoria-Ni/TiO 2 [76], and TiO 2 /ZnO mixture [77] after 90, 90, 80, 70, 45, 30 min UV radiation time, respectively. Significantly more time (240 min) was required to reach the maximum efficiency (90%) of MO degradation in the presence of graphene oxide supported titanium dioxide (GO/TiO 2 ) composites [78].…”

“…According to the published reports, high effectiveness (80-99%) of MO photocatalytic degradation can be achieved also by employing other photocatalysts. The degradation efficiency 98% of MO photocatalytic degradation was reached using Fe 3 O 4 nanoparticles [81], Pt modified TiO 2 [74], and TiO 2 -CuZSM-5 mixture [76], 99% by Ag/HSTiO 2 catalyst [70], and chitosan with immobilized nano-CdS photocatalyst [44], 96% by scoria-Ni/TiO 2 [76], 93% by employing SiO 2 -TiO 2 photocatalyst [82], and 87% using Cu-doped ZnO nanoparticles [79]. Significantly lower efficiency (50-70%) of MO degradation was found when using such photocatalysts as Ag/TiO 2 nanocomposites [83], anatase TiO 2 nanoparticles [80], MnWO 4 powder [68], and ZnO/GO and TiO 2 /ZnO/GO nanocomposite photocatalyst [84].…”

g-C3N4 Based Photocatalyst for the Efficient Photodegradation of Toxic Methyl Orange Dye: Recent Modifications and Future Perspectives

“…MO dye is nonbiodegradable, due to its complex aromatic structure and xenobiotic properties [ 33 ]. Several methods are described for MO removal, such as adsorption [ 34 , 35 , 36 ], biodegradation [ 37 ], phytoremediation [ 38 ] ozonation [ 39 ], coagulation/flocculation [ 40 ] and heterogenous photodegradation [ 41 , 42 , 43 , 44 ]. It has complex molecular structures, which make their removal from wastewater difficult when using conventional treatment methods [ 45 ].…”

Eco-Friendly Green Synthesis and Photocatalyst Activity of Ag-ZnO Nanocomposite

“…Among the different methods proposed for wastewater treatment [4][5][6], the photocatalytic process utilizing nano-sized materials has emerged as a reliable and environmentally safe technique. This process offers complete mineralization of dyes on the surface of these materials and is known for its high sensitivity, reasonable costs, and effectiveness [7][8][9][10][11][12][13][14][15][16].…”