Solar Photochemistry for Environmental Remediation - Advanced Oxidation Processes for Industrial Wastewater Treatment

Oliveira, Anabela S.; Saggioro, Enrico Mendes; Pavesi, Thelma; Moreira, Josino Costa; Ferreira, L. F. Vieira

doi:10.5772/38444

Cited by 14 publications

(15 citation statements)

References 86 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…TiO 2 is primarily preferred because it is photoactive, biologically and chemically inert, photostable (i.e. not liable to photoanodic corrosion), inexpensive and non-toxic [2, 3, 4, 5]. However, it absorbs only in the UV spectrum.…”

Section: Introductionmentioning

confidence: 99%

H 2 O 2 rejuvenation-mediated synthesis of stable mixed-morphology Ag 3 PO 4 photocatalysts

Agbe

Raza

Dodoo‐Arhin

et al. 2018

Heliyon

View full text Add to dashboard Cite

Ag3PO4 photocatalyst has attracted interest of the scientific community in recent times due to its reported high efficiency for water oxidation and dye degradation. However, Ag3PO4 photo-corrodes if electron accepter such as AgNO3 is not used as scavenger. Synthesis of efficient Ag3PO4 followed by a simple protocol for regeneration of the photocatalyst is therefore a prerequisite for practical application. Herein, we present a facile method for the synthesis of a highly efficient Ag3PO4, whose photocatalytic efficiency was demonstrated using 3 different organic dyes: Methylene Blue (MB), Methyl orange (MO) and Rhodamine B (RhB) organic dyes for degradation tests. Approximately, 19 % of Ag3PO4 is converted to Ag0 after 4.30 hours of continuous UV-Vis irradiation in presence of MB organic dye. We have shown that the Ag/Ag3PO4 composite can be rejuvenated by a simple chemical oxidation step after several cycles of photocatalysis tests. At an optimal pH of 6.5, a mixture of cubic, rhombic dodecahedron, nanosphere and nanocrystals morphologies of the photocatalyst was formed. H2O2 served as the chemical oxidant to re-insert the surface metallic Ag into the Ag3PO4 photocatalyst but also as the agent that can control morphology of the regenerated as-prepared photocatalyst without the need for any other morphology controlling Agent (MCA). Surprisingly, the as- regenerated Ag3PO4 was found to have higher photocatalytic reactivity than the freshly made material and superior at least 17 times in comparison with the conventional Degussa TiO2, and some of TiO2 composites tested in this work.

show abstract

Section: Introductionmentioning

confidence: 99%

H 2 O 2 rejuvenation-mediated synthesis of stable mixed-morphology Ag 3 PO 4 photocatalysts

Agbe

Raza

Dodoo‐Arhin

et al. 2018

Heliyon

View full text Add to dashboard Cite

show abstract

“…Environmental remediation of residues and effluents containing dangerous pollutants is nowadays an issue of great concern and several strategies are being developed especially directed towards the treatment of carcinogenic, persistent and emergent contaminants [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Adsorption for environmental remediation: the use of activated carbon as a by-product from a biomass gasification plant compared with commercial activated carbon

Oliveira

Cardoso

Maia

et al. 2014

WIT Transactions on Ecology and the Environment

View full text Add to dashboard Cite

Activated carbon is a well known amorphous adsorbent for hydrophobic pollutants, having the ability to take in its porous structure molecules of very different sizes. Portalegre Polytechnic Institute has a pilot plant for biomass gasification for syngas production, the residues of which need remediation. The syngas production process produces tar rich liquid condensates and powdered carbon as main residues. The powdered carbon is in fact activated carbon once it results from partial combustion at high temperatures and so it can be used as an adsorbent for pollutant removal from any effluent. Condensates resulting from gasification are coloured and strongly odoured residues; rich in hydrocarbon contaminants usually known as tars. In this work, powdered carbon residue was used to adsorb the contaminants present in the condensate residue produced in the process. The adsorption process was shown to be highly efficient in the removal of odour and colour from gasification condensates and the results were not very much different from the ones obtained for commercial activated carbon. After being used for adsorption, the carbon residue can be reburned in the gasification plant (which also needs coal for the heating start up procedure) to promote a final destruction process of the adsorbed contaminants with production of freshly activated carbon.

show abstract

“…Photocatalysis is the combination of photochemistry and catalysis, a process where light and catalysis are simultaneously used to promote or accelerate a chemical reaction. It could be defined as a catalysis driven acceleration of a light induced reaction [24]. Photocatalysis appears as an excellent tool for final treatments of samples containing persistent organic pollutants (POPs) when compared to classical treatments [25,26].…”

Section: Solar Photocatalytic Degradation (Spd)mentioning

confidence: 99%

“…Water may seem to be abundant on our planet but not readily assessable. In fact, less than 1% of world potable water is available for immediate human consumption and even that is not uniformly distributed around the globe [3]. This implies that proper waste water management is a good way of bridging the water demand supply gap and this inevitably could be achieved using renewable energy on both environmental and cost grounds [4] to aid the supply of clean water.…”

Section: Introductionmentioning

confidence: 99%

Solar Energy Application in Waste Treatment- A Review

2016

View full text Add to dashboard Cite

This review is an exposure on the various ways that solar energy can be harnessed for numerous waste treatment processes. Almost all forms of waste treatment require energy which is scarcely available considering the global energy crisis. The objective of this study is to enumerate the solar energy applications in waste treatment as a way of global environmental protection and energy management. Solar energy which is abundant in most part of the world has been adopted as a very sustainable source of energy for waste treatment. Its application in both solid waste and waste water treatment as in pyrolysis, solar incineration and gasification for solid wastes treatment and solar pathogenic organic destruction, solar photocatalytic degradation, solar distillation and desalination for waste water treatment. These waste treatment methods require light from the sun to photocatalyse reactions and also heat as thermal energy for the various endothermic reactions. This review therefore highlighted various methods of waste treatment which does not require the limited conventional energy sources. It also reveals that model optimizations for assessing the best options for potential pollutant treatment in pyrolysis,, solar incineration, gasification, photo catalytic degradation etc, of contaminants have not been achieved.

show abstract

Solar Photochemistry for Environmental Remediation - Advanced Oxidation Processes for Industrial Wastewater Treatment

Cited by 14 publications

References 86 publications

H 2 O 2 rejuvenation-mediated synthesis of stable mixed-morphology Ag 3 PO 4 photocatalysts

H 2 O 2 rejuvenation-mediated synthesis of stable mixed-morphology Ag 3 PO 4 photocatalysts

Adsorption for environmental remediation: the use of activated carbon as a by-product from a biomass gasification plant compared with commercial activated carbon

Solar Energy Application in Waste Treatment- A Review

Contact Info

Product

Resources

About