Zinc oxide incorporated carbon nanotubes or graphene oxide nanohybrids for enhanced sonophotocatalytic degradation of methylene blue dye

Mohamed, Mohamed Mokhtar; Ghanem, Mohamed A.; Khairy, Mohamed; Naguib, Eman M.; Alotaibi, Nouf H.

doi:10.1016/j.apsusc.2019.05.135

Cited by 90 publications

(15 citation statements)

References 38 publications

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“…The as-prepared ZnO-GO composites exhibit more excellent and stable photocatalytic performance than pure ZnO, ascribed to the fact that GO sheets collected and transmitted the electrons, thereby inhibiting the recombination of electron-hole pairs. Compared with other previous reports on ZnO-GO composites catalysts, most of which use light sources with hundreds of W or higher power to excite the catalysts for photocatalytic reactions [25]; the as-prepared ZnO-GO catalysts in this study showed higher catalytic activity under the light source of 50 W mercury lamps. This effective photocatalyst is an outstanding candidate for catalysts in photocatalytic degradation of organic dyes.…”

Section: Introductioncontrasting

confidence: 60%

“…Table 1 shows the comparison of photocatalytic MB degradation performance of our prepared ZnO/GO composite with other materials reported. Mohamed et al [25] reported on photocatalysis of ZnO/GO, detecting the MB degradation under visible light illumination using a 160 W Hg lamp; in their study, a solution of 20 mg/L (100 mL) of MB and 50 mg of catalyst were used. Their results show that above 93% MB could be degraded after 180 min by ZnO/GO composite.…”

Section: Journal Of Nanomaterialsmentioning

confidence: 99%

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Green Synthesis of ZnO-GO Composites for the Photocatalytic Degradation of Methylene Blue

Lin

Hong

Chen

et al. 2020

Journal of Nanomaterials

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Beneficial from the excellent optical performance of zinc oxide (ZnO) nanocrystals and the absorption properties of graphene oxide (GO), the nanocomposites of ZnO and GO with synergistic photocatalytic effects were prepared by a precipitation method, in which GO is utilized as the catalyst carrier. The prepared composites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy and also performed photocatalytic activity for the nanocomposites. The results show that ZnO is uniformly loaded on the surface of GO assisted by an effective interface coupling. Due to interface coupling between ZnO and GO, electrons can be directly transferred from the valence band of ZnO to GO. The photodegradation efficiency of the composites reaches to 97.6%, and the first-order reaction rate constant of photodegradation is calculated to be 0.04401 min-1. The novel ZnO-GO composites with excellent photocatalytic performance display promising potential applications in the field of photocatalysis and will provide a new platform for building next-generation graphene-based semiconductor composites.

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Section: Introductioncontrasting

confidence: 60%

Section: Journal Of Nanomaterialsmentioning

confidence: 99%

Green Synthesis of ZnO-GO Composites for the Photocatalytic Degradation of Methylene Blue

Lin

Hong

Chen

et al. 2020

Journal of Nanomaterials

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“…In sonocatalysis, the degradation is 13.7 % and 7.0 % after 2 h of US in the presence of ZnO and TiO2 respectively. In photocatalysis, degradation was 55 % (ZnO) and 46 % (TiO 2 ) under UV irradiation for 2 h. Nonetheless, sonophotocatalysis was 85 %lowerwith ZnO and 65 % lower using TiO 2 in 2 h. [75] Pure ZnO Wastewater (textile) [83] Talebian et al [71] investigated the improved sonophotocatalytic degradation of Orange G in aqueous media under UV light using ZnO nanoparticles as a catalyst. The effects of sonocatalysis, photocatalysis, and sonophotocatalysis were tested to investigate the influence of the change in initial dyeconcentration, pH, and catalyst morphology on degradation rates.…”

Section: Sonophotocatalytic Performance Of Znomentioning

confidence: 99%

“…Mohamed et al [83] investigated the combination of Zinc oxide into carbon nanotubes (ZnO/CNTs) or graphen oxide (ZnO/GO) with various weight ratios of zinc oxide; they used the ultrasonication/hydrothermal method used synthesizing the nanohybrides. The fabricated nanomaterials were examined for the decomposition of methylene blue dye (MB) in the photocatalytic process and irradiated by visible light and ultrasound waves.…”

Section: Sonophotocatalytic Performance Of Znomentioning

confidence: 99%

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Sonophotocatalytic Degradation of Pollutants by ZnO‐Based Catalysts: A Review

Asli

Taghizadeh

2020

ChemistrySelect

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Sonophotocatalyticprocess (SPC) is the simultaneous use of ultraviolet radiation (UV), ultrasonic radiation (US), and semiconductor materials as photocatalysts and sonocatalysts for the generation of reactive oxygen species (ROS). These free radicals oxidize several pollutant molecules in various industrial wastewaters. The objective of this review was to compare the papers published on the sonophotocatalytic degradation of different pollutants in the presence of zinc oxide-based particles. The elimination rate of contaminants in this process was compared with individual methods such as sonocatalysis and photo-catalysis. The experimental conditions, including the catalyst dosage, the pollutant concentration, the radiation power, the applied frequency, the initial pH, and the reaction time were further investigated. ZnO nanoparticles are well-known as semiconductor materials with good sonophotocatalytic activity. In general, sonophotocatalysis is emerging as one of the most efficient treatment techniques for degrading the recalcitrant pollutants in the aqueous medium. It is expected that these technologies result in more progressive research with the most degradation efficiency.

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Ruthenium Complexes with a SWCNT‐Modified Terpyridine Ligand as an Efficient Electrocatalyst for Oxygen Evolution Reaction

Zhang

et al. 2021

Energy Tech

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Electrocatalytic oxygen evolution reaction (OER) plays an important role in various renewable energy conversion and storage technologies. Ruthenium complexes with terpyridine (tpy) and bipyridine (bpy) as ligands are considered to be an important catalyst for OER electrocatalysis. Their catalytic performance is affected by substituent groups of the tpy (and bpy) ligands, and is often limited by low current density. Here, we report a Ru‐polypyridine complex covalently anchored to single‐walled carbon nanotubes (SWCNTs) via a tpy ligand to form a hybrid material of SWCNT‐tpyRubpy. Electrocatalytic OER studies have shown that the covalent attachment of the Ru‐polypyridine complexes to SWCNTs avoids noticeable molecular aggregations and increases the conductivity. Compared with that of the SWCNT‐unattached complex, SWCNT‐tpyRubpy exhibits a higher electrocatalytic OER activity with a low onset potential of 1.48 V (vs reversible hydrogen electrode) and a smaller Tafel slope of 109 mV dec−1 in alkaline solution. Therefore, the CNT‐hybridization is an effective method for the construction of advanced SWCNT‐based Ru complex electrocatalysts and to understand their catalytic performance.

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Zinc oxide incorporated carbon nanotubes or graphene oxide nanohybrids for enhanced sonophotocatalytic degradation of methylene blue dye

Cited by 90 publications

References 38 publications

Green Synthesis of ZnO-GO Composites for the Photocatalytic Degradation of Methylene Blue

Green Synthesis of ZnO-GO Composites for the Photocatalytic Degradation of Methylene Blue

Sonophotocatalytic Degradation of Pollutants by ZnO‐Based Catalysts: A Review

Ruthenium Complexes with a SWCNT‐Modified Terpyridine Ligand as an Efficient Electrocatalyst for Oxygen Evolution Reaction

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