Recent advances in the elimination of persistent organic pollutants by photocatalysis

Abstract

The non-ending needs of growing human population are being met by rapid industrialization and globalization, which have nowadays become an indispensable component of growth. Although these activities have led to phenomenal growth of the human civilization, at the same time, they have resulted in severe environmental pollution by discharge of highly toxic waste. This waste is severely detrimental not only for the environment but also for the health of the human population. Among different classes of pollutants, one being considered as one of the highly toxic ones is that of persistent organic pollutants (POPs). Advanced oxidation technologies (AOTs) play a major role in the degradation of pollutants by converting organic pollutants into CO2, H2O, and mineralized inorganic ions. AOTs include UV-based photocatalysis, ozonation, electrochemical oxidation, and Fenton and Fenton-like processes There are some difficulties and challenges associated with AOT, such as being highly capital intensive and high consumption of energy. To overcome these bottlenecks, photocatalytic degradation is a promising method that uses solar energy for the degradation of such pollutants. Photocatalysis is further classified into homogenous and heterogenous photocatalysis. As a part of heterogenous photocatalysis, semiconductor photocatalysts have received great attention; but because of their drawbacks such as the recombination of the electron/hole pair, low adsorption rate, and low surface area coverage, nanotechnology was considered for bringing a novel and enhanced remediation photocatalysis process. To this end, the designing of a more efficient photocatalyst by modifying morphology, composition, and structure and reducing toxicity is the need of the hour for the abatement of environmental pollutants. This review focuses on the degradation and removal of highly toxic persistent organic pollutants by using photocatalytic degradation with a detailed account of the various pollutants, their degradation mechanism, process shortcomings, remedial measures, and future prospects.

Exposure to Environmental Toxins: Potential Implications for Stroke Risk via the Gut– and Lung–Brain Axis

“…Persistent organic pollutants (POPs) represent a broad class of toxins abundant in the environment and formed as byproducts from industrial or chemical processes, such as waste incineration, vehicle exhaust, and cigarette smoke [50][51][52][53]. Due to their physical properties, these pollutants resist natural degradation processes and persist in the environment.…”

“…Due to their physical properties, these pollutants resist natural degradation processes and persist in the environment. Common POPs include organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), dioxins, and dibenzofurans [50]. These persistent pollutants are ubiquitous in atmospheric, terrestrial, and aquatic environments [52].…”

Advances in Computational Methods for Modeling Photocatalytic Reactions: A Review of Recent Developments

“…By discerning light intensity, wavelength, or color, this technology supports optical communication, imaging, and encryption, thus aiding the progress of information and security systems. Furthermore, photocatalysis significantly contributes to environmental well-being, evident in its capacity to purify water [9] or air [10] from pollutants and pathogens. The capability of photocatalysis directly enhances environmental quality and, subsequently, human health, rendering it a crucial tool in attaining the global objective of clean and safe resources.…”

Ti–N–C Bonded Close‐Coupled TiO2/g‐C3N4 for Rapid Degradation of Cationic Dyes from a Multi‐Dye System by Persulfate Activation

“…Ever-increasing disposal of recalcitrant organic pollutants into the ecosystem has only aggravated these pursuits. Heterogenous photocatalystbased advanced oxidation processes (AOP) have been considered a sustainable approach to address the problem [1,2]. Pioneered by the discovery of photocatalytic water splitting over TiO 2 by Fujishima and Honda, extensive scientific attention has been paid to the development of sustainable heterogeneous photocatalysts for this objective [3][4][5].…”