No abstract

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 TiO, 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 TiO 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.

No abstract

With the ever-increasing impact of chemicals on our life, organic pollutants have emerged as a topic of significant concern. Photodegradation of organic wastes has exponentially jumped up as an advanced technology for pollutant termination from the system. There has been a range of photocatalysts that have been applied for the degradation of such organic compounds. Graphene-based ternary nanocomposites have shown a major pathway for combatting these organic pollutants. This article studied one such Ternary nanocomposite made up in situ; sonochemically synthesized and deposited CdS nanoparticles over Titania-reduced Graphene oxide (TiO 2 -rGO). The product obtained was washed with double distilled water and characterized by powder XRD, SEM, TEM and HRTEM, AFM, and solid-state UV-visible (DRS). It was further analyzed for its photoactivity through dye degradation on Methylene Blue compared with binary nanocomposites. Photocatalytic degradation of Triclosan was done using this ternary nanocomposite, and the rate constant was calculated to be around 2.7×10 -3 min −1 .

No abstract