Browsing by Author "Ankita Ojha"

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Emerging trends in photodegradation of petrochemical wastes: a review
(Springer Verlag, 2016) Pardeep Singh; Ankita Ojha; Anwesha Borthakur; Rishikesh Singh; D. Lahiry; Dhanesh Tiwary; Pradeep Kumar Mishra
Various human activities like mining and extraction of mineral oils have been used for the modernization of society and well-beings. However, the by-products such as petrochemical wastes generated from such industries are carcinogenic and toxic, which had increased environmental pollution and risks to human health several folds. Various methods such as physical, chemical and biological methods have been used to degrade these pollutants from wastewater. Advance oxidation processes (AOPs) are evolving techniques for efficient sequestration of chemically stable and less biodegradable organic pollutants. In the present review, photocatalytic degradation of petrochemical wastes containing monoaromatic and poly-aromatic hydrocarbons has been studied using various heterogeneous photocatalysts (such as TiO2, ZnO and CdS. The present article seeks to offer a scientific and technical overview of the current trend in the use of the photocatalyst for remediation and degradation of petrochemical waste depending upon the recent advances in photodegradation of petrochemical research using bibliometric analysis. We further outlined the effect of various heterogeneous catalysts and their ecotoxicity, various degradation pathways of petrochemical wastes, the key regulatory parameters and the reactors used. A critical analysis of the available literature revealed that TiO2 is widely reported in the degradation processes along with other semiconductors/nanomaterials in visible and UV light irradiation. Further, various degradation studies have been carried out at laboratory scale in the presence of UV light. However, further elaborative research is needed for successful application of the laboratory scale techniques to pilot-scale operation and to develop environmental friendly catalysts which support the sustainable treatment technology with the “zero concept” of industrial wastewater. Nevertheless, there is a need to develop more effective methods which consume less energy and are more efficient in pilot scale for the demineralization of pollutant. © 2016, Springer-Verlag Berlin Heidelberg.
Microplastic in the Aquatic Ecosystem and Human Health Implications
(wiley, 2022) Ankita Ojha; Ankitendran Mishra; Dhanesh Tiwary
xOver the past few decades plastic pollution has become a matter of grave concern, and combatting it has been challenging for environmentalists. Massive dumping of plastic wastes has undoubtedly created a threatening situation for aquatic ecosystems and human health. Microplastics (MPs) are defined as plastic fragments with a size <5â€‰mm in length that tend to stay in marine and freshwater systems. Their concentration varies from location to location, and so does their effect on human health. The capturing of these MPs has created a significant issue in the aquatic fauna. Their engulfment or entanglement by freshwater and marine animals makes their entry into the human food chain a certainty. Entering these MPs into the human system can create significant health impacts such as neural, renal, hepatic, and congenital disorders. They are not only harmful as such, but are known to be a potent carrier for many organic and inorganic pollutants. This chapter focuses on the rising impact of these MPs on human health and considers various organ systems that are affected by them. Some of the case studies and plausible solutions will also be considered while discussing these environmental hazards. © 2022 John Wiley & Sons Ltd. All rights reserved.