Revisiting the catalytic activity of a doped SrFeO3 for water pollutants removal: Effect of light and temperature

Non-thermal plasma is one of the most promising technologies used for the degradation of hazardous pollutants in wastewater. Recent studies evidenced that various operating parameters influence the yield of the Non-Thermal Plasma (NTP)-based processes. In particular, the presence of a catalyst, suitably placed in the NTP reactor, induces a significant increase in process performance with respect to NTP alone. For this purpose, several researchers have studied the ability of NTP coupled to catalysts for the removal of different kind of pollutants in aqueous solution. It is clear that it is still complicated to define an optimal condition that can be suitable for all types of contaminants as well as for the various types of catalysts used in this context. However, it was highlighted that the operational parameters play a fundamental role. However, it is often difficult to understand the effect that plasma can induce on the catalyst and on the production of the oxidizing species most responsible for the degradation of contaminants. For this reason, the aim of this review is to summarize catalytic formulations coupled with non-thermal plasma technology for water pollutants removal. In particular, the reactor configuration to be adopted when NTP was coupled with a catalyst was presented, as well as the position of the catalyst in the reactor and the role of the main oxidizing species. Furthermore, in this review, a comparison in terms of degradation and mineralization efficiency was made for the different cases studied.

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Removal of COD and Ammonia-Nitrogen by Sawdust/Bentonite Augmented SBR Process

10.20944/preprints201808.0103.v1 ◽

2018 ◽

Author(s):

Parsa Mohajeri ◽

Mohammad Razip Selamat ◽

Abdul Aziz Hamidi ◽

Carol Smith

Keyword(s):

Landfill Leachate ◽

Operation Time ◽

Cost Effective ◽

Ammonia Nitrogen ◽

Industrial Applications ◽

Aeration Rate ◽

Pollutant Removal ◽

Contact Period ◽

Water Pollutants ◽

Pollutants Removal

Water pollutants removal by biomass adsorbent has been considered innovative and cost effective, thus commendable for application in industrial applications. However, certain important aspects have been overlooked by researchers, namely the efficiency in the operation time and pollutant removal. In this research, landfill leachate samples with organic components were treated using bentonite-enriched with sawdust augmented (SBR) process. By modifying the pH, the sawdust samples were categorized into three: the acidic, the alkaline, and the neutral. To bentonite samples, the pH-adjusted sawdust was added at 10%, 20%, and 30% amounts by mass respectively. At the optimum aeration rate of 7.5 L/min and contact period of 22 h, the treatment achieved 99.28% and 95.41% removal of COD and NH3-N with bentonite respectively.  For both pollutants, in the presence of sawdust, the removal reduced by about 17% with contact period reduced to 2 h which was a considerable achievement.

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Preliminary evaluation of resorcinol-formaldehyde carbon gels for water pollutants removal

Acta Chimica Slovaca ◽

10.1515/acs-2017-0009 ◽

2017 ◽

Vol 10 (1) ◽

pp. 54-60 ◽

Cited By ~ 1

Author(s):

Muhammad Abbas Ahmad Zaini ◽

Seiichiro Yoshida ◽

Takeshi Mori ◽

Shin R. Mukai

Keyword(s):

Methylene Blue ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Resorcinol Formaldehyde ◽

Water Pollutants ◽

Carbon Gels ◽

Oxidized Carbon ◽

Carbon Gel ◽

Pollutants Removal

Abstract The present work was aimed to evaluate the suitability of resorcinol-formaldehyde carbon gels as adsorbent for water pollutants removal. The carbon gels were characterized using N2 adsorption-desorption isotherm for specific surface area, and Fourier transform infrared (FTIR) for surface functional groups. Methylene blue and cesium were employed as model water pollutants. Results show that the un-oxidized carbon gel, despite its lower specific surface area (333 m2/g) displayed a 118 mg/g removal of methylene blue, that is higher than 35 mg/g by the oxidized carbon gel (418 m2/g). The evaluation of adsorption kinetics revealed a lower pseudo-first order rate constant of 0.088 h-1 for 10 mg/L methylene blue adsorption. A positive effect of surface oxidation was demonstrated for cesium adsorption. On molar basis, however, the oxidized carbon gel exhibits a selective removal towards methylene blue compared to cesium. Carbon gel is a promising candidate for water pollutants removal, and further treatment needs to be sought to boost its performance.

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Porous CuO nanostructure as a reusable catalyst for oxidative degradation of organic water pollutants

New Journal of Chemistry ◽

10.1039/c5nj02515j ◽

2016 ◽

Vol 40 (1) ◽

pp. 348-357 ◽

Cited By ~ 35

Author(s):

Pangkita Deka ◽

Ramesh C. Deka ◽

Pankaj Bharali

Keyword(s):

Methylene Blue ◽

Catalytic Activity ◽

Methyl Orange ◽

Oxidative Degradation ◽

Reusable Catalyst ◽

High Catalytic Activity ◽

Water Pollutants ◽

Cuo Nanostructure

Porous CuO nanostructure exhibits high catalytic activity for the degradation of methylene blue and methyl orange in the presence of H2O2.

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Direct Z-scheme of WO3/GO Decorated with Silver Nanoparticles for Synergetic Adsorption and Photocatalytic Activity for Organic and Inorganic Water Pollutants Removal

Applied Surface Science ◽

10.1016/j.apsusc.2021.150410 ◽

2021 ◽

pp. 150410

Author(s):

Amal Abd Elhakim ◽

Maged El-Kemary ◽

Mohamed M. Ibrahim ◽

Ibrahim M. El-Mehasseb ◽

Hamdy S. EL-Sheshtawy

Keyword(s):

Silver Nanoparticles ◽

Photocatalytic Activity ◽

Water Pollutants ◽

Pollutants Removal

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Highly Robust and Selective System for Water Pollutants Removal: How to Transform a Traditional Photocatalyst into a Highly Robust and Selective System for Water Pollutants Removal

Nanomaterials ◽

10.3390/nano9111509 ◽

2019 ◽

Vol 9 (11) ◽

pp. 1509 ◽

Cited By ~ 5

Author(s):

Olga Sacco ◽

Vincenzo Vaiano ◽

Christophe Daniel ◽

Wanda Navarra ◽

Vincenzo Venditto

Keyword(s):

Photocatalytic Activity ◽

Large Scale ◽

High Efficiency ◽

Pollutant Removal ◽

Water Pollutants ◽

Selective System ◽

Marked Selectivity ◽

Acidic Conditions ◽

Pollutants Removal ◽

Water Pollutant

Highly porous monolithic aerogels based on ZnO photocatalyst and syndiotactic polystyrene (s-PS) were obtained by supercritical CO2 treatment of ZnO/s-PS gels. The prepared aerogels were characterized and their photocatalytic activity was evaluated using phenol and toluene as water pollutant models. The s-PS nanoporous crystalline phase, able to absorb pollutant molecules, was proven to be necessary to ensure high photocatalytic efficiency as the aerogel acts not only as a support, but also as pollutant pre-concentrator. The reusability of ZnO/s-PS aerogels is also strong showing no decrease in photocatalytic activity after six consecutive degradation trials. Finally, the aerogel matrix prevents ZnO dissolution occurring under acidic conditions and promotes a selective removal of the pollutants. The synergy between the photocatalyst and the innovative polymeric support provides the composite system with robustness, chemical stability, easy recovery after treatment, high efficiency of pollutant removal with a marked selectivity which make these materials promising for large scale applications.

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ZnO/ZnFe2O4/Ag hollow nanofibers with multicomponent heterojunctions for highly efficient photocatalytic water pollutants removal

Ceramics International ◽

10.1016/j.ceramint.2019.08.061 ◽

2019 ◽

Vol 45 (17) ◽

pp. 23522-23527 ◽

Cited By ~ 1

Author(s):

Feng Cao ◽

Yunan Wang ◽

Jianmin Wang ◽

Xi Yang ◽

Yan Chen ◽

...

Keyword(s):

Hollow Nanofibers ◽

Water Pollutants ◽

Highly Efficient ◽

Pollutants Removal

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Kinetic investigation of photo-catalytic activity of TiO2/metal nanocomposite in phenol photo-degradation using Monte Carlo simulation

RSC Advances ◽

10.1039/c5ra02226f ◽

2015 ◽

Vol 5 (45) ◽

pp. 36108-36116 ◽

Cited By ~ 4

Author(s):

Hamed Moradmand Jalali

Keyword(s):

Monte Carlo Simulation ◽

Monte Carlo ◽

Catalytic Activity ◽

Kinetic Monte Carlo ◽

Kinetic Investigation ◽

Photo Degradation ◽

Water Pollutants ◽

Photo Catalytic Activity ◽

Metal Nanocomposite ◽

Activity Mechanism

Kinetic Monte Carlo simulation was applied to study the kinetics and photo-catalytic activity mechanism of TiO2 anatase, P25, Au/TiO2, Pd/TiO2 and Au–Pd/TiO2 applied in photo-degradation of water pollutants including phenol.

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