Recent advances in photoinduced catalysis for water splitting and environmental applications

Agbe, Henry; Nyankson, Emmanuel; Raza, Nadeem; Dodoo‐Arhin, David; Chauhan, Aditya; Osei, Gabriel; Kumar, Vasant; Kim, Ki‐Hyun

doi:10.1016/j.jiec.2019.01.004

Cited by 51 publications

(18 citation statements)

References 251 publications

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“…AOPs which include sonolysis, Fenton processes, photocatalysis, and the use of UV radiation and hydrogen peroxide are nontoxic and economical and can degrade different types of organic pollutants [3]. Photocatalysis is one of the most widely studied AOPs, and its potential in the degradation of dyes has been examined on different photocatalysts such as TiO 2 [13], Ag 3 PO 4 [14], TiO 2 -Ag [15], and ZnO [16]. Photocatalysis involves (a) the absorption of photons (the energy of the photons must be greater than the bang gap energy), (b) excitation of photogenerated electrons from the valence band (VB) to the conduction band (CB) generating electron-hole pair, and (c) oxidation of adsorbed pollutants by the VB hole which is strongly oxidizing.…”

Section: Introductionmentioning

confidence: 99%

“…Photocatalysis involves (a) the absorption of photons (the energy of the photons must be greater than the bang gap energy), (b) excitation of photogenerated electrons from the valence band (VB) to the conduction band (CB) generating electron-hole pair, and (c) oxidation of adsorbed pollutants by the VB hole which is strongly oxidizing. e CB electrons which are strongly reducing can be used to create reactive oxygen species that can attack pollutants and degrade them [13]. TiO 2 is a semiconductor photocatalyst and has been investigated by many researchers.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Application of Fe-Doped TiO₂-Halloysite Nanotubes Composite and Their Potential Application in Water Treatment

Nyankson

Agyei‐Tuffour

Adjasoo

et al. 2019

Advances in Materials Science and Engineering

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In this work, the potential application of TiO 2 -Fe-HNT photocatalyst-adsorbent composite in water treatment technologies was confirmed. e photocatalyst-adsorbent composite (TiO 2 -Fe-HNTs) was synthesized by the hydrothermal method and characterized by X-ray diffraction, thermogravimetric analysis, Fourier-transform infrared spectroscopy, scanning electron microscopy-energy dispersive X-ray spectroscopy, and diffuse reflectance spectroscopy. e adsorption and photocatalysis mechanism by the TiO 2 -Fe-HNT composite were examined on methylene blue dye, rhodamine blue dye, naproxen sodium (pharmaceutical drug waste), and imidacloprid (pesticide). e TiO 2 -Fe-HNT composite was active in UV and visible regions of the electromagnetic spectrum. e adsorption and photocatalytic efficiency increased with increasing amount of HNTs. e photocatalyst-adsorbent composite exhibited excellent removal efficiency for pharmaceutical waste (naproxen sodium) and pesticides (imidacloprid). An adsorption equilibrium data fitted well with the pseudo-second-order kinetics for both methylene blue and rhodamine blue dyes with the intraparticle model describing its rate-controlling steps. e Langmuir and Freundlich isotherm models further described the adsorption of methylene blue and rhodamine blue molecules, respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Application of Fe-Doped TiO₂-Halloysite Nanotubes Composite and Their Potential Application in Water Treatment

Nyankson

Agyei‐Tuffour

Adjasoo

et al. 2019

Advances in Materials Science and Engineering

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“…Interest in semiconductor photocatalysis has risen exponentially in recent decades because of the potential and opportunities it offers in a variety of fields . Its key advantage is the capacity to utilize solar energy, offering a good substitute for the energy‐intensive conventional technologies.…”

Section: Introductionmentioning

confidence: 99%

“…Interest in semiconductor photocatalysis has risen exponentially in recent decades because of the potential and opportunities it offers in a variety of fields. 1 Its key advantage is the capacity to utilize solar energy, offering a good substitute for the energy-intensive conventional technologies. Semiconductor photocatalysis converts organic contaminants to innocuous, inorganic products, takes place under mild environmental conditions and can be applied to aqueous, gaseous and solid phases, individually or after integration with most present technologies.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic disinfection and purification of water employing reduced graphene oxide/TiO₂ composites

Berberidou

Kyzas

Paspaltsis

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Recombination of photogenerated carriers in titanium dioxide (TiO2)‐mediated semiconducting photocatalysis is considered to be the principal obstacle in its unlimited exploitation in practical applications. Hybridization of TiO2 with graphene‐based materials appears to be a highly promising alternative. In this context, reduced graphene oxide (rGO)/TiO2 composites were prepared using a simple ultrasonically assisted route under mild reaction conditions. RESULTS The as‐prepared composites were characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), energy‐dispersive X‐ray spectrometry (EDS), Fourier‐transform infrared spectroscopy (FTIR) and nitrogen adsorption–desorption isotherms. Photocatalytic efficiencies of the as‐prepared composites were evaluated employing the pesticide clopyralid as a model pollutant. Initial degradation and mineralization rates obtained in the presence of the as‐prepared composites were, in all cases, higher than the one obtained in the presence of the bare TiO2, with 5% rGO/TiO2 achieving the highest r0 and rDOC values. The as‐prepared composites also were evaluated based on their potential to inactivate bacterial endospores of the Bacillus stearothermophilus species, well‐known for their extraordinary resistance to most inactivation processes. Prevalence of 5% rGO/TiO2 in the inactivation of B. stearothermophilus among all as‐prepared materials was evident, accomplished within 120 min of UV‐A illumination. Real‐time PCR experiments enabled the detection of genomic DNA released during photocatalytic oxidation, in the presence of 5% rGO/TiO2 and UV‐A, suggesting lysis of the outer and inner spore coat caused by the generated ROS. CONCLUSIONS These findings demonstrate the potential of rGO, a low‐cost, nontoxic material to serve as a reliable alternative in the enhancement of TiO2 photocatalytic efficiency in water processing applications. © 2019 Society of Chemical Industry

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“…Schematic of charge carrier dynamics in a semiconductor: one electron transported to the surface; two holes transported to the surface; three surface recombinations; four bulk recombinations; five electron transfers to respective acceptor molecules; and six hole trappings by a donor molecule. (Reprinted with permission from [34]. Copyright (2019), Elsevier).…”

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Two-Dimensional Materials and Composites as Potential Water Splitting Photocatalysts: A Review

et al. 2020

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Hydrogen production via water dissociation under exposure to sunlight has emanated as an environmentally friendly, highly productive and expedient process to overcome the energy production and consumption gap, while evading the challenges of fossil fuel depletion and ecological contamination. Various classes of materials are being explored as viable photocatalysts to achieve this purpose, among which, the two-dimensional materials have emerged as prominent candidates, having the intrinsic advantages of visible light sensitivity; structural and chemical tuneability; extensively exposed surface area; and flexibility to form composites and heterostructures. In an abridged manner, the common types of 2D photocatalysts, their position as potential contenders in photocatalytic processes, their derivatives and their modifications are described herein, as it all applies to achieving the coveted chemical and physical properties by fine-tuning the synthesis techniques, precursor ingredients and nano-structural alterations.

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Recent advances in photoinduced catalysis for water splitting and environmental applications

Cited by 51 publications

References 251 publications

Synthesis and Application of Fe-Doped TiO₂-Halloysite Nanotubes Composite and Their Potential Application in Water Treatment

Synthesis and Application of Fe-Doped TiO₂-Halloysite Nanotubes Composite and Their Potential Application in Water Treatment

Photocatalytic disinfection and purification of water employing reduced graphene oxide/TiO₂ composites

Two-Dimensional Materials and Composites as Potential Water Splitting Photocatalysts: A Review

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Recent advances in photoinduced catalysis for water splitting and environmental applications

Cited by 51 publications

References 251 publications

Synthesis and Application of Fe-Doped TiO2-Halloysite Nanotubes Composite and Their Potential Application in Water Treatment

Synthesis and Application of Fe-Doped TiO2-Halloysite Nanotubes Composite and Their Potential Application in Water Treatment

Photocatalytic disinfection and purification of water employing reduced graphene oxide/TiO2 composites

Two-Dimensional Materials and Composites as Potential Water Splitting Photocatalysts: A Review

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Product

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About

Synthesis and Application of Fe-Doped TiO₂-Halloysite Nanotubes Composite and Their Potential Application in Water Treatment

Synthesis and Application of Fe-Doped TiO₂-Halloysite Nanotubes Composite and Their Potential Application in Water Treatment

Photocatalytic disinfection and purification of water employing reduced graphene oxide/TiO₂ composites