Cobalt-doped ZnS-reduced graphene oxide nanocomposite as an advanced photocatalytic material

Agorku, Eric Selorm; Mamo, Messai A.; Mamba, Bhekie B.; Pandey, Avinash C.; Mishra, Ajay Kumar

doi:10.1007/s10934-014-9871-y

Cited by 40 publications

(15 citation statements)

References 46 publications

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“…The VB and CB of GO/rGO involve antibonding π‐orbitals (π*‐orbitals) of carbon atoms and 2π‐bonding of oxygen. Concurrently, nanocomposites of GO and rGO, such as ZnS/rGO, ZnO/rGO, Ag 3 PO 4 /GO, Cu 2 O/rGO, MoS 2 /rGO, SnS 2 /GO, TiO 2 /rGO, ZnO/GO, CuS/GO, ZnIn 2 S 4 /rGO, and others have been shown to be high‐performance photocatalysts. The search for efficient visible light harvesting systems has motivated several researchers to design GO(or rGO)‐based semiconductor nanocomposites for photocatalysis application.…”

Section: Recent Progress In the Design Of Semiconductor Photocatalystmentioning

confidence: 99%

Recent Progress in the Development of Semiconductor‐Based Photocatalyst Materials for Applications in Photocatalytic Water Splitting and Degradation of Pollutants

Opoku

Govender

Sittert

et al. 2017

Advanced Sustainable Systems

168

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Photocatalytic approaches in the visible region show promising potential in photocatalytic water splitting and water treatment to boost water purification efficiency. For this reason, developing cost‐effective and efficient photocatalysts for environmental remediation is a growing need, and semiconductor photocatalysts have now received more interest owing to their excellent activity and stability. Recently, several metal oxides, sulfides, and nitrides‐based semiconductors for water splitting and photodegradation of pollutants have been developed. However, the existing challenges, such as high over potential, wide band gap as well as fast recombination of charge carriers of most of the semiconductors limit their photocatalytic properties. This review summarizes the recent state‐of‐the‐art first‐principles research progress in the design of effective visible‐light‐response semiconductor photocatalysts through several modification processes with a focus on density functional theory (DFT) calculations. Recent developments to the exchange‐correlation effect, such as hybrid functionals, DFT + U as well as methods beyond DFT are also emphasized. Recent discoveries on the origin, fundamentals, and the underlying mechanisms of the interfacial electron transfer, band gap reduction, enhanced optical absorption, and electron–holes separation are presented. Highlights on the challenges and proposed strategies in developing advanced semiconductor photocatalysts for the application in water splitting and degradation of pollutants are proposed.

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Section: Recent Progress In the Design Of Semiconductor Photocatalystmentioning

confidence: 99%

Recent Progress in the Development of Semiconductor‐Based Photocatalyst Materials for Applications in Photocatalytic Water Splitting and Degradation of Pollutants

Opoku

Govender

Sittert

et al. 2017

Advanced Sustainable Systems

168

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“…as ZnO [43]. This reduction in area under UV-vis reflectance spectrum of bulk ZnO is accompanied by a color change from light brown to dark brown as shown in Fig.…”

Section: Preparation and Characterization Of Adsorbentsmentioning

confidence: 89%

A fiber optics system for monitoring utilization of ZnO adsorbent beds during desulfurization for logistic fuel cell applications

Sujan

Yang

Dimick

et al. 2016

Journal of Power Sources

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An in-situ fiber optic based technique for direct measurement of capacity utilization of ZnO adsorbent beds by monitoring bed color changes during desulfurization for fuel cell systems is presented. Adsorbents composed of bulk metal oxides (ZnO) and supported metal oxides (ZnO/SiO 2 and Cu-ZnO/SiO 2) for H 2 S removal at 22 °C are examined. Adsorbent bed utilization at breakthrough is determined by the optical sensor as the maximum derivative of area under UV-vis spectrum from 250-800 nm observed as a function of service time. Since the response time of the sensor due to bed color change is close to bed breakthrough time, a series of probes along the bed predicts utilization of the portion of bed prior to H 2 S breakthrough. The efficacy of the optical sensor is evaluated as a function of inlet H 2 S concentration, H 2 S flow rate and desulfurization in presence of CO, CO 2 and moisture in feed. A 6 mm optical probe is employed to measure utilization of a 3/16 inch ZnO extrudate bed for H 2 S removal. It is envisioned that with the application of the optical sensor, desulfurization can be carried out at high adsorbent utilization and low operational costs during on-board miniaturized fuel processing for logistic fuel cell power systems.

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“…To apply the modified Hummers Method, graphite oxide (GO) was readied with natural graphite powder (15). A blend of concentrated sulfuric acid (150 ml), graphite (2.5 g), and NaNO3 (1.5 g) within an ice bath were stirred for 40 min.…”

Section: Synthesis Of Graphene Oxidementioning

confidence: 99%

Studies on the Removal of Indigo Carmin from Aqueous Solutions by GO, Oxidized MWCNTs, AC, and MWCNTs

Abbasi

Noorizadeh

2018

Iran J Health Sci

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Background and purpose: Quick removal of dye from water and waste water is very important in the research related to eliminating pollutions; this is because of the spread of damaging effects of dyes in water on the human beings and the environment. Four different carbon nanostructures, namely graphene oxide, oxidized multiwalled carbon nanotubes, activated carbon, and multiwalled carbon nanotubes were applied as adsorbents for the removal of Indigo Carmin (IC) dye from aqueous solution. Materials and Methods: These carbon nanostructures were determined by X-ray diffractometer and scanning electron microscope. Batch adsorption experiments were then performed to investigate the effect of solution pH, concentration, contact time, and temperature on IC removal. To study the characteristics of IC adsorption process, adsorption constants were calculated by first-order and pseudo second-order models. Results: Adsorption equilibrium was indicated with Freundlich and Langmuir isotherm models. This study was the first research conducted on the removal of dye which uses four carbon nanostructures adsorbents. Conclusion: The results indicated better efficiency for GO in IC removal than other carbon adsorbents. The isotherm parameters for the Freundlich and Langmuir models were calculated. The kinetics research also revealed that the experimental data was well fitted by pseudo secondorder equation.

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Cobalt-doped ZnS-reduced graphene oxide nanocomposite as an advanced photocatalytic material

Cited by 40 publications

References 46 publications

Recent Progress in the Development of Semiconductor‐Based Photocatalyst Materials for Applications in Photocatalytic Water Splitting and Degradation of Pollutants

Recent Progress in the Development of Semiconductor‐Based Photocatalyst Materials for Applications in Photocatalytic Water Splitting and Degradation of Pollutants

A fiber optics system for monitoring utilization of ZnO adsorbent beds during desulfurization for logistic fuel cell applications

Studies on the Removal of Indigo Carmin from Aqueous Solutions by GO, Oxidized MWCNTs, AC, and MWCNTs

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