Synthesis of nanocomposite TiO2/ZrO2 prepared by different templates and photocatalytic properties for the photodegradation of Rhodamine B

Fan, Meiqing; Hu, Songxia; Ren, Bo; Wang, Jun; Jing, Xiaoyan

doi:10.1016/j.powtec.2012.09.042

Cited by 34 publications

(20 citation statements)

References 38 publications

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“…9. In line with Figure 6, the degradation efficiency of RhB is proportional with the amount of active sites [25,[27][28][29][30][31] . Therefore, more amount of catalyst is added to the reaction mixture, higher degradation efficiency of RhB is in the range of 0 -0.15 mg/L as observed in Fig.…”

Section: Effect Of Catalyst Dosesupporting

confidence: 84%

“…Indeed, the destruction of RhB chromophores depends on the concentration of HO• radicals dissociated from H 2 O 2 . Thus, the reaction rate of RhB decomposition is essentially rational to the amount of H 2 O 2 added [22,27,28,30,31] . Therefore, next experiment series investigate the effects of catalyst dose on the removal of RhB in water.…”

Section: Effect Of Oxidant Amountsmentioning

confidence: 99%

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Oxidative Treatment of Rhodamine B Solution on CoOx/sepiolite Catalysts

Tien

Long

Ngoc

et al. 2020

Fine Chemical Engineering

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Sepiolite loaded with different cobalt oxide contents has been prepared by the precipitation method followed by calcination at 410ºC. The synthesized Co-loaded samples were characterized by physical methods using XRD, SEM, BET, and H2-TPR. The obtained solids have a large specific area and good distribution of cobalt oxide nanoparticles on sepiolite carrier. The catalysts were tested for the oxidative removal of rhodamine B solution and found that 1.0 – 3.0 wt.% cobalt ion/sepiolite samples exhibited the highest decoloration efficiency of rhodamine B (88-90%) in the presence of hydrogen peroxide at room temperature after the treatment of 30 mg/L of RhB solution in 210 minutes.

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Section: Effect Of Catalyst Dosesupporting

confidence: 84%

Section: Effect Of Oxidant Amountsmentioning

confidence: 99%

Oxidative Treatment of Rhodamine B Solution on CoOx/sepiolite Catalysts

Tien

Long

Ngoc

et al. 2020

Fine Chemical Engineering

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“…The peak around 25.3° related to the (101) plane of the TiO2 anatase phase diminishes in the presence of ZrO2 evidencing a variation in crystallinity of the material. This is associated with the incorporation of ZrO2 into the composites that retards the crystallite growth and the anatase crystallization process [19,[24][25][26]. In contrast, the diffraction pattern measured for pristine ZrO2 shows the presence of two different crystalline structures in the material: Tetragonal ZrO2 (JCPDS 79-1769) and Monoclinic…”

Section: Photocatalysts Characterizationmentioning

confidence: 99%

Interfacial charge-transfer process across ZrO2-TiO2 heterojunction and its impact on photocatalytic activity

Guerrero-Araque

Ramírez-Ortega

Acevedo–Peña

et al. 2017

Journal of Photochemistry and Photobiology A: Chemistry

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2 Graphical abstract Highlights: ZrO2-TiO2 heterojunction with high photocatalytic activity were obtained by solgel. Energy states at heterojunction interface altered the semiconducting properties. 5 mol% ZrO2 in ZrO2-TiO2 heterojunction propitiated a better electron-hole separation. Photocatalytic activity is improved by favoring the charge transfer process. Direct and indirect charge transfer process involved in phototocatalytic process. Abstract.In this paper, ZrO2-TiO2 composites were synthesized by sol-gel method with different ZrO2:TiO2 molar ratios (01:99, 05:95 and 10:90). The results identified two trends; at a low ZrO2 content, the incorporation of Zr 4+ into the TiO2 lattice was possible provoking generation of oxygen vacancies (1 mol % of ZrO2); while at higher ZrO2 contents, ZrO2-TiO2 heterojunctions were created (5 and 10 mol % of ZrO2). The photocatalytic activity was evaluated by measuring photodegradation of phenoxyacetic acid, 2,4-dichlorophenoxyacetic acid or 4-chlorophenol solutions. The ZT-5 composite shows the best performance attributed to surface states at the interface of ZrO2-TiO2 heterojunctions.These surface states act as traps for charge carriers favoring the spatial separation of electron-hole pairs until reaching a maximum in the composite with 5 mol% of ZrO2. The ZT-5 composite showed the most negative flat band potential and the highest donor density indicating that these surface states are in optimal concentration. At higher ZrO2 contents, charge carrier separation is less effective, which decreases the photocatalytic activity.Nevertheless, the molecule structure has an impact on the direct or indirect charge transfer process as was evidenced by EIS measurements.

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“…5 shows the N 2 adsorption-desorption isotherms of Zn-SnS 2 and SnS 2 . As can be seen, both samples displayed type IV isotherms with a type H3 hysteresis loop at relative pressure (P/P 0 ) between 0.4 and 1.0, indicating the existence of mesopores (pores with diameters between 2 and 50 nm, according to the IUPAC classification) [28][29][30][31][32][33]. The formation of mesoporous structures in these samples can be ascribed to the aggregation of their plate-like primary particles.…”

Section: Resultsmentioning

confidence: 85%