scholarly journals Overview of Photocatalytic Membrane Reactors in Organic Synthesis, Energy Storage and Environmental Applications

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 239 ◽  
Author(s):  
Raffaele Molinari ◽  
Cristina Lavorato ◽  
Pietro Argurio ◽  
Kacper Szymański ◽  
Dominika Darowna ◽  
...  
Keyword(s):  
Organic Synthesis ◽  
Organic Contaminants ◽  
Photocatalytic Oxidation ◽  
Green Technology ◽  
Membrane Reactors ◽  
Process Efficiency ◽  
Water And Wastewater Treatment ◽  
Visible Light Active ◽  
Water And Wastewater ◽  
Harsh Conditions

This paper presents an overview of recent reports on photocatalytic membrane reactors (PMRs) in organic synthesis as well as water and wastewater treatment. A brief introduction to slurry PMRs and the systems equipped with photocatalytic membranes (PMs) is given. The methods of PM production are also presented. Moreover, the process parameters affecting the performance of PMRs are characterized. The applications of PMRs in organic synthesis are discussed, including photocatalytic conversion of CO2, synthesis of KA oil by photocatalytic oxidation, conversion of acetophenone to phenylethanol, synthesis of vanillin and phenol, as well as hydrogen production. Furthermore, the configurations and applications of PMRs for removal of organic contaminants from model solutions, natural water and municipal or industrial wastewater are described. It was concluded that PMRs represent a promising green technology; however, before the application in industry, additional studies are still required. These should be aimed at improvement of process efficiency, mainly by development and application of visible light active photocatalysts and novel membranes resistant to the harsh conditions prevailing in these systems.

Photocatalysis (TiO2/Solar) in Water and Wastewater Treatment

2019 ◽  
pp. 171-199
Author(s):  
Nurul Aiin Ab Aziz ◽  
Puganeshwary Palaniandy
Keyword(s):  
Wastewater Treatment ◽  
Water Treatment ◽  
Organic Contaminants ◽  
Advanced Oxidation ◽  
Heterogeneous Photocatalysis ◽  
Complete Oxidation ◽  
Water And Wastewater Treatment ◽  
Oxidation Processes ◽  
Process Characteristics ◽  
Water And Wastewater

Advanced oxidation processes (AOPs) have gained growing importance for the removal of organic pollutants from water. Heterogeneous photocatalysis has been rapidly expanding for water treatment. This approach has economic and sustainability advantages compared with other processes. The main advantage of this process is its capability to gain complete oxidation or mineralization of organic contaminants at conditions of near ambient temperature and pressure. This chapter aims to review the mechanism involved in this process, characteristics of semiconductor photocatalyst, difference between suspended and immobilized photocatalyst system, comparison between the use of natural sunlight and commercial lamp, also the reactor involved. Potential advantages and limitations, as well as the application of photocatalysis in water and wastewater are also discussed.

scholarly journals The Evolution of Photocatalytic Membrane Reactors over the Last 20 Years: A State of the Art Perspective

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 775
Author(s):  
Raffaele Molinari ◽  
Cristina Lavorato ◽  
Pietro Argurio
Keyword(s):  
Wastewater Treatment ◽  
Membrane Fouling ◽  
Polymeric Membranes ◽  
Membrane Reactors ◽  
Water And Wastewater Treatment ◽  
Know How ◽  
Degradation Reactions ◽  
Water And Wastewater ◽  
Year 2000 ◽  
Synthesis Reactions

The research on photocatalytic membrane reactors (PMRs) started around the year 2000 with the study of wastewater treatment by degradation reactions of recalcitrant organic pollutants, and since then the evolution of our scientific knowledge has increased significantly, broadening interest in reactions such as the synthesis of organic chemicals. In this paper, we focus on some initial problems and how they have been solved/reduced over time to improve the performance of processes in PMRs. Some know-how gained during these last two decades of research concerns decreasing/avoiding the degradation of the polymeric membranes, improving photocatalyst reuse, decreasing membrane fouling, enhancing visible light photocatalysts, and improving selectivity towards the reaction product(s) in synthesis reactions (partial oxidation and reduction). All these aspects are discussed in detail in this review. This technology seems quite mature in the case of water and wastewater treatment using submerged photocatalytic membrane reactors (SPMRs), while for applications concerning synthesis reactions, additional knowledge is required.

Unravelling the visible light-assisted catalytic prowess of an n–n type In2S3/CeO2 Z-scheme heterojunction towards organic and inorganic water pollution mitigation

2021 ◽  
Author(s):  
M. Murugalakshmi ◽  
B. Filip Jones ◽  
G. Mamba ◽  
D. Maruthamani ◽  
V. Muthuraj
Keyword(s):  
Water Pollution ◽  
Wastewater Treatment ◽  
Visible Light ◽  
Water And Wastewater Treatment ◽  
Pollution Mitigation ◽  
Visible Light Active ◽  
Water And Wastewater

The exploitation of visible light active photocatalysts for the removal of various pollutants has been given tremendous consideration in water and wastewater treatment.

Treatment of Real Wastewater from Organic Contaminants by Using Biochar

2021 ◽  
Vol 1038 ◽  
pp. 258-265
Author(s):  
Edita Baltrėnaitė-Gedienė ◽  
Valentyna Iurchenko ◽  
Elena Lebedeva ◽  
Oksana Melnikova ◽  
Natalia Kosenko
Keyword(s):  
Sorption Capacity ◽  
Organic Contaminants ◽  
Paper Mill ◽  
High Specific Surface Area ◽  
Sorption Properties ◽  
Water And Wastewater Treatment ◽  
Surface Functionality ◽  
Water And Wastewater ◽  
Paper Mill Wastewater ◽  
Sorption Characteristics

In a number of water use schemes (water and wastewater treatment), physicochemical treatment methods, in particular adsorption, have been successfully used. However, widespread adoption of these methods is hindered by the high cost of sorbents. One of the promising solutions to these problem of sorption treatment is the use of biochar. Due to its high specific surface area, well-developed porous structure, and surface functionality, biochar has been used as inexpensive adsorbent. The purpose of the laboratory experiments is to determine the sorption properties of biochar obtained from pine – sorption capacity, sorption rate, and purification effect – while removing organic contaminants from real paper mill wastewater. The sorption properties of biochar were studied under static and dynamic conditions, varying the size of the fractions, and processing time. The sorption characteristics of biochar of all the studied fractions were established and it was shown that the most effective sorbent in removing organic contaminants is the 1-biochar’s fraction of (sorption capacity of 11.9 mg of COD per of sorbent). The data obtained enable theoretically substantiate the presence of certain functional groups on the surface of the researched biochar, as well as to develop technological regimes for the treatment of natural and waste waters of a certain composition with its help.

scholarly journals Photocatalysis in the treatment and disinfection of water. Part I. Theoretical backgrounds / Fotokataliza w oczyszczaniu i dezynfekcji wody część i. podstawy teoretyczne

2012 ◽  
Vol 19 (4) ◽  
pp. 489-512 ◽  
Author(s):  
Michał Bodzek ◽  
Mariola Rajca
Keyword(s):  
Low Cost ◽  
Membrane Reactors ◽  
Treatment Technology ◽  
Water And Wastewater Treatment ◽  
Wastewater Treatment Process ◽  
Photocatalytic Reactor ◽  
Advanced Oxidation Technology ◽  
Oxidation Technology ◽  
Persistent Organic Compounds ◽  
Water And Wastewater

Abstract Photocatalysis process belongs to an advanced oxidation technology for the removal of persistent organic compounds and microorganisms from water. It is the technology with a great potential, a low-cost, environmental friendly and sustainable treatment technology to align with the “zero” waste scheme in the water/wastewater industry. At present, the main technical barriers that impede its full commercialization remained on the post-recovery of the catalyst particles after water treatment. This paper reviews the background of the process and photooxidation mechanisms of the organic pollutants and microorganisms. The review of the latest progresses of engineered-photocatalysts, photo-reactor systems, and the kinetics and modeling associated with the photocatalytic and photodisinfection water and wastewater treatment process, has been presented. A number of potential and commercial photocatalytic reactor configurations are discussed, in particular the photocatalytic membrane reactors. The effects of key photo-reactor operation parameters and water quality on the photoprocess performances in terms of the mineralization and disinfection are assessed.

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