Gold nanoparticles Wells–Dawson heteropolyacid nanocomposite film as an effective nanocatalyst in photocatalytic removal of azo dyes from wastewaters

Rohani, Neda; Bamoharram, Fatemeh F.; Marjani, Azam; Heravi, Majid Μ.

doi:10.1007/s40097-017-0218-5

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…It can be seen from Fig. 2a that all the heteropoly acids exhibit similar XRD patterns in the region, of 2θ = 5-40° (Wang et al 2016;Rohani et al 2017;Gim et al 2016). Figure 2b shows that the Dawson structures of CTAB@HPA-x (x = 1-6) were well retained after the introduction of CTAB compared with HPA-x (x = 1-6).…”

Section: Characteristics Of Catalyst Samplesmentioning

confidence: 87%

“…The low-sulfur petroleum coke (S < 3.0 wt%) is mainly used to manufacture carbon products such as graphite electrodes (Wei et al 2017), activated carbon (Choi et al 2012), carbon fiber (Briceño et al 2015), graphite (Wu et al 2017). High-sulfur petroleum coke (HSPC, S > 3.0 wt%) is typically employed as fuel for heating or power, and it can only be classified as waste which causes environmental issues and needs to be handled with considerable cost (Chen and Lu 2007;Peng et al 2019;Zhong et al 2018bZhong et al , 2019. Therefore, in order to adapt to the new requirements of energy conservation and environmental protection, developing an alternative method to reduce the sulfur content of HSPC is extremely desirable.…”

Section: Introductionmentioning

confidence: 99%

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Insight into the oxidative desulfurization of high-sulfur petroleum coke under mild conditions: a journey of vanadium-substituted Dawson-type phosphotungstic acid

Hua

Wei

et al. 2021

Pet. Sci.

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High-sulfur petroleum coke (HSPC), that is a by-product from slag oil in the coking process of refining, shows versatility values in practical applications and, however, concentrates the majority of organic sulfur. Herein, we design and construct a highly effective CTAB@HPA composites to be explored for the catalytic oxidative desulfurization of HSPC under mild conditions using hydrogen peroxide as the oxidant and 1-butyl-3-methylimidazole tetrafluoroborate ionic liquid as the extractant. The results demonstrate that the sulfur content of HSPC could be strikingly reduced from 4.46 wt% to 2.48 wt% under 60 °C and atmospheric pressure, and that the organic sulfur in HSPC is mainly oxidized to sulfoxide, sulfone and sulfate, which latter can be directly separated from petroleum coke. Moreover, the effect of reaction conditions on the desulfurization performance of HSPC as well as the catalytic oxidation reaction kinetic of HSPC desulfurization was systematically investigated. Furthermore, a mechanism for the oxidative desulfurization of HSPC over CTAB@HPA catalysts was proposed. Therefore, this work provides new insight into how to construct active catalysts for the desulfurization of HSPC under mild conditions.

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Section: Characteristics Of Catalyst Samplesmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Insight into the oxidative desulfurization of high-sulfur petroleum coke under mild conditions: a journey of vanadium-substituted Dawson-type phosphotungstic acid

Hua

Wei

et al. 2021

Pet. Sci.

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show abstract

“…Other photocatalysts (Table 3) for the degradation of azo dyes were reported in the form of nanocomposites based on Al [47], Au [48], Bi [49][50][51], Fe [52][53][54][55], Li [56], Ni [57], and Zr [58]. The Fe-based photocatalysts are exploited for their easy separation due to the fact of their magnetic properties.…”

Section: Other Nanocomposite Photocatalystsmentioning

confidence: 99%

Polymer Nanocomposites for Photocatalytic Degradation and Photoinduced Utilizations of Azo-Dyes

Wang

Xiao

2021

Polymers

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Specially designed polymer nanocomposites can photo-catalytically degrade azo dyes in wastewater and textile effluents, among which TiO2-based nanocomposites are outstanding and extensively explored. Other nanocomposites based on natural polymers (i.e., chitosan and kaolin) and the oxides of Al, Au, B, Bi, Fe, Li, and Zr are commonly used. These nanocomposites have better photocatalytic efficiency than pure TiO2 through two considerations: (i) reducing the hole/electron recombination rate by stabilizing the excited electron in the conducting band, which can be achieved in TiO2-nanocomposites with graphene, graphene oxide, hexagonal boron nitride (h-BN), metal nanoparticles, or doping; (ii) decreasing the band energy of semiconductors by forming nanocomposites between TiO2 and other oxides or conducting polymers. Increasing the absorbance efficiency by forming special nanocomposites also increases photocatalytic performance. The photo-induced isomerization is exploited in biological systems, such as artificial muscles, and in technical fields such as memory storage and liquid crystal display. Heteroaryl azo dyes show remarkable shifts in photo-induced isomerization, which can be applied in biological and technical fields in place of azo dyes. The self-assembly methods can be employed to synthesize azo-dye polymer nanocomposites via three types of interactions: electrostatic interactions, London forces or dipole/dipole interactions between azo dyes, and photo alignments.

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“…The size of pure TiO 2 is bigger than Mg-doped TiO 2 in both methods. This average grain size is related to different growth orientations [30].…”

Section: X-ray Diffractionmentioning

confidence: 99%

Preparation of Mg-doped TiO2 nanoparticles for photocatalytic degradation of some organic pollutants

Giahi¹,

Pathania²,

Agarwal³

et al. 2019

Studia UBB Chemia

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In this study, the sol-gel method was used to prepare Mgdoped TiO2 nanoparticles from titanium tetraisopropoxide and magnesium sulfate as the dopant precursors. Mg-doped TiO2 shows the formation of anatase phase with polyhedral and spherical particles with an average size of 25-30 nm. X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and photoluminescence were used to characterize the prepared material. The photocatalytic degradation performance of rhodamine B, nonylphenol ethoxylates, pseudoephedrine hydrochloride, and nicotine on Mg-doped TiO2 was studied under UV irradiation. The photocatalytic degradation shows that 98.92, 98.00, 98.00 and 97.95% of rhodamine B, nonylphenol ethoxylates, pseudoephedrine hydrochloride, and nicotine was decomposed by Mg-doped TiO2, respectively.

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Gold nanoparticles Wells–Dawson heteropolyacid nanocomposite film as an effective nanocatalyst in photocatalytic removal of azo dyes from wastewaters

Cited by 9 publications

References 20 publications

Insight into the oxidative desulfurization of high-sulfur petroleum coke under mild conditions: a journey of vanadium-substituted Dawson-type phosphotungstic acid

Insight into the oxidative desulfurization of high-sulfur petroleum coke under mild conditions: a journey of vanadium-substituted Dawson-type phosphotungstic acid

Polymer Nanocomposites for Photocatalytic Degradation and Photoinduced Utilizations of Azo-Dyes

Preparation of Mg-doped TiO2 nanoparticles for photocatalytic degradation of some organic pollutants

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