Optimization of thermal exfoliation of graphitic carbon nitride for methylparaben photocatalytic degradation under simulated solar radiation

Morales, Jorge Plaza; Arencibia, Amaya; López-Muñoz, Marı́a José

doi:10.1039/d3ta01109g

Cited by 11 publications

(5 citation statements)

References 29 publications

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“…After 3 h of UV to VIS irradiation, the difference in photocatalytic activity for unmodified g-CN nanosheet materials over AO7 was 35%. The thermal exfoliation process increases dye molecules' adsorption capacity, leading to a better ability to suppress the recombination of charge carriers 73 , 79 – 81 . Under UV and VIS light, the photodegradation activities for the nanosheet silver-modified g-CN materials ranged from 51 to 78 and 89–98%.…”

Section: Resultsmentioning

confidence: 99%

Comparative study of photocatalysis with bulk and nanosheet graphitic carbon nitrides enhanced with silver

Michalska,

Pavlovsky,

Simha Martynkova

et al. 2024

Sci Rep

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The main goal of this research is to investigate the effectiveness of graphitic carbon nitride (g-C3N4, g-CN) in both bulk and nanosheet forms, which have been surface-modified with silver nanoparticles (Ag NPs), as photocatalysts for the degradation of acid orange 7 (AO7), a model dye. The photodegradation of AO7 dye molecules in water was used to test the potential photocatalytic properties of these powder materials under two different lamps with wavelengths of 368 nm (UV light) and 420 nm (VIS light). To produce Ag NPs (Ag content 0.5, 1.5, and 3 wt%) on the g-CN materials, a new synthesis route based on a wet and low-temperature method was proposed, eliminating the need for reducing agents. The photodegradation activity of the samples increased with increasing silver content, with the best photocatalytic performances achieved for bulk g-CN samples and nanosheet silver-modified samples (with the highest content of 3 wt% Ag) under UV light, i.e., more than 75% and 78%, respectively. The VIS-induced photocatalytic activity of both examined series was higher than that of UV. The highest activities of 92% and 98% were achieved for the 1.5% Ag-modified g-CN bulk and nanosheet materials. This research presents an innovative, affordable, and environmentally friendly chemical approach to synthesizing photocatalysts that can be used for degrading organic pollutants in wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Comparative study of photocatalysis with bulk and nanosheet graphitic carbon nitrides enhanced with silver

Michalska,

Pavlovsky,

Simha Martynkova

et al. 2024

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The cost per tonne of two of the most widely used agents, hydrochloric acid and sodium hydroxide, can be around the hundreds of dollars, whereas the most used photocatalyst, titanium dioxide, can reach prices up to a few thousands of dollars per tonne . Apart from the photocatalyst, the reactor design, the light intensity, and the irradiation times influence greatly the total cost of the photocatalytic process at a laboratory scale. , Additionally, the set ups may require auxiliary equipment for continuous monitoring, maintenance and recalibration of the light source, since the performance of the photoreactor may be affected by irregular light emission of lamps . Therefore, careful economical analysis of these factors must be done before scaling-up.…”

Section: Desorption Methods/regeneration Strategiesmentioning

confidence: 99%

“…Plaza et al 155 recommend evaluating the prospect of using solar radiation instead of synthetic light in large scale applications. 155 Nonetheless, the average sunlight intensity of the location should be considered. For example, Muthukumar et al 158 positively evaluated the feasibility of photodegradation of 4-nitrophenol under natural sunlight.…”

Section: Acsmentioning

confidence: 99%

“…154 Apart from the photocatalyst, the reactor design, the light intensity, and the irradiation times influence greatly the total cost of the photocatalytic process at a laboratory scale. 155,156 Additionally, the set ups may require auxiliary equipment for continuous monitoring, maintenance and recalibration of the light source, since the performance of the photoreactor may be affected by irregular light emission of lamps. 157 Therefore, careful economical analysis of these factors must be done before scaling-up.…”

Section: Acsmentioning

confidence: 99%

“…157 Therefore, careful economical analysis of these factors must be done before scaling-up. Plaza et al 155 recommend evaluating the prospect of using solar radiation instead of synthetic light in large scale applications. 155 Nonetheless, the average sunlight intensity of the location should be considered.…”

Section: Acsmentioning

confidence: 99%

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Desorption Strategies and Reusability of Biopolymeric Adsorbents and Semisynthetic Derivatives in Hydrogel and Hydrogel Composites Used in Adsorption Processes

Alcalde-Garcia,

Prasher,

Kaliaguine

et al. 2023

ACS Eng. Au

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Adsorption is a promising technique for the removal of persistent contaminants, since it is a relatively cheap process with low energy requirements and does not produce secondary contamination. However, the large-scale implementation of an adsorption process usually involves a dual column process for either pressure swing or temperature swing operations. Therefore, the reusability of adsorbents is a key characteristic to consider and evaluate but is often overlooked during the development of new materials. To be reused, the adsorbent should successfully release the contaminant by a desorption or regeneration step without compromising the chemical and physical stability of the matrix. The efficiency of desorption/regeneration methods depends greatly on the chemical characteristics of the contaminants, the nature of the adsorbents, and the adsorption mechanisms responsible for the adsorbent−adsorbate interactions. This review focuses on the desorption strategies that have been used for the regeneration of biobased hydrogels and hydrogel composites, materials that have been successfully applied in the adsorption of wastewater contaminants. The strategies can be divided into chemical and physical methods. The chemical methods include the use of desorption agents, photocatalytic oxidation, and CO 2 bubbling; and the physical methods include thermal and ultrasonic treatments. These regeneration strategies have shown different efficiencies as well as specific advantages and drawbacks that need to be considered to select the most suitable method for a specific application.

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Use of graphitic carbon nitrides as solar-light-driven photocatalysts for the reduction of p-nitrobenzoic acid

Timoner,

Arques,

Amat

et al. 2024

Catalysis Today

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Optimization of thermal exfoliation of graphitic carbon nitride for methylparaben photocatalytic degradation under simulated solar radiation

Abstract: Previous studies have shown that the exfoliation of graphitic carbon nitride (g-C3N4) is essential to obtain materials with good photocatalytic properties. However, in most works the influence of the exfoliation...

Cited by 11 publications

References 29 publications

Comparative study of photocatalysis with bulk and nanosheet graphitic carbon nitrides enhanced with silver

Comparative study of photocatalysis with bulk and nanosheet graphitic carbon nitrides enhanced with silver

Desorption Strategies and Reusability of Biopolymeric Adsorbents and Semisynthetic Derivatives in Hydrogel and Hydrogel Composites Used in Adsorption Processes

Use of graphitic carbon nitrides as solar-light-driven photocatalysts for the reduction of p-nitrobenzoic acid

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