Fate and toxicity of pharmaceuticals in water environment: An insight on their occurrence in South Asia

Khan, Hudda Khaleeq; Rehman, Muhammad Yasir Abdur; Malik, Riffat Naseem

doi:10.1016/j.jenvman.2020.111030

Cited by 144 publications

(47 citation statements)

References 180 publications

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“…ACT is classified under analgesic drug class which is a commonly prescribed pain killer. Previous studies were reported about the occurrence of ATL and ACT in WWTP effluents and water bodies worldwide and suggested the need for adopting advanced treatment options (Khan et al 2020 ; Tran et al 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Novel organic assisted Ag-ZnO photocatalyst for atenolol and acetaminophen photocatalytic degradation under visible radiation: performance and reaction mechanism

Ramasamy¹,

Jeyanthi²,

Chinnaiyan

2021

Environ Sci Pollut Res

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This study is on photocatalytic degradation of pharmaceutical residues of atenolol (ATL) and acetaminophen (ACT) present in secondary effluent under visible light irradiation stimulated by Ag doped ZnO (Ag-ZnO) photocatalyst. Lawsonia inermis leaf extract was used for reduction of Zinc sulphate to ZnO nanoparticles (NPs). Further, ZnO NPs were doped with Ag and characterized by XRD, FT-IR, SEM-EDX, surface area analyzer, UV-Vis, and photoluminescence spectrometry to analyze the structure, morphology, chemical composition, and optical property. FT-IR analysis revealed major functional groups such as OH, C=O, and SEM analysis depicted the polyhedron shape of the NPs with size range of 100 nm. Ag-ZnO NPs were used in the photocatalytic degradation of ATL and ACT, and its removal was evaluated by varying initial contaminant concentration, catalyst dosage, and initial pH. Findings indicate that Ag-ZnO NPs demonstrated relative narrow bandgap and efficient charge separation that resulted in enhanced photocatalytic activity under visible light illumination. The photocatalytic degradation of ATL and ACT fitted well with pseudo-first-order kinetic model. Further, it was found that under optimal conditions of 5 mg/L of contaminants, pH of 8.5, and catalyst dose of 1 g/L, degradation efficiency of 70.2% (ATL) and 90.8% (ACT) was achieved for a reaction time of 120 min. More than 60% reduction in TOC was observed for both contaminants and OH• pathway was found to be the major removal process. Ag-ZnO photocatalyst showed good recycling performance, and these findings indicate that it could be cost effectively employed for removing emerging contaminants under visible light radiation. Supplementary Information The online version contains supplementary material available at 10.1007/s11356-021-13532-2.

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Section: Introductionmentioning

confidence: 99%

Novel organic assisted Ag-ZnO photocatalyst for atenolol and acetaminophen photocatalytic degradation under visible radiation: performance and reaction mechanism

Ramasamy¹,

Jeyanthi²,

Chinnaiyan

2021

Environ Sci Pollut Res

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“…They use natural processes, including substrates, plants, soils, and microbes, to filter and treat pollutants in water. Recent studies on CWs have gained significance due to their ability to treat pharmaceuticals [ 24 , 25 ] from municipal and hospital wastewater [ 26 , 27 ]. There is evidence to suggest that CWs can be an effective mitigation strategy for antibiotic drugs [ 28 ], ARB, and ARGs [ 29 , 30 ], as well as organic pollutants and heavy metals [ 31 , 32 ] that have also been postulated to select for antibiotic resistance [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

Performance Efficiency of Conventional Treatment Plants and Constructed Wetlands towards Reduction of Antibiotic Resistance

Hazra

Durso

2022

Antibiotics

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Domestic and industrial wastewater discharges harbor rich bacterial communities, including both pathogenic and commensal organisms that are antibiotic-resistant (AR). AR pathogens pose a potential threat to human and animal health. In wastewater treatment plants (WWTP), bacteria encounter environments suitable for horizontal gene transfer, providing an opportunity for bacterial cells to acquire new antibiotic-resistant genes. With many entry points to environmental components, especially water and soil, WWTPs are considered a critical control point for antibiotic resistance. The primary and secondary units of conventional WWTPs are not designed for the reduction of resistant microbes. Constructed wetlands (CWs) are viable wastewater treatment options with the potential for mitigating AR bacteria, their genes, pathogens, and general pollutants. Encouraging performance for the removal of AR (2–4 logs) has highlighted the applicability of CW on fields. Their low cost of construction, operation and maintenance makes them well suited for applications across the globe, especially in developing and low-income countries. The present review highlights a better understanding of the performance efficiency of conventional treatment plants and CWs for the elimination/reduction of AR from wastewater. They are viable alternatives that can be used for secondary/tertiary treatment or effluent polishing in combination with WWTP or in a decentralized manner.

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“…In aquatic environments, direct discharge of untreated and treated wastewater from treatment plants are the major source of pharmaceuticals, while terrestrial runoff from agricultural fields, aquaculture facilities and livestock farms are some of the secondary sources as shown in Figure 1 [7,8]. Aquatic channels act as transport routes for pharmaceuticals and their bioaccumulation is mainly due to their lipophilic character, although other factors such as animal homeostasis, metabolism and inhalation exposure are also important in understanding their accumulation in organisms [9][10][11][12]. Compared to other organic contaminants, hydrophobic interactions are not the main influencing parameter on the partitioning dynamics of most pharmaceuticals.…”

Section: Introductionmentioning

confidence: 99%

Graphene-Based Composites as Catalysts for the Degradation of Pharmaceuticals

Olatunde

Onwudiwe

2021

IJERPH

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The incessant release of pharmaceuticals into the aquatic environment continues to be a subject of increasing concern. This is because of the growing demand for potable water sources and the potential health hazards which these pollutants pose to aquatic animals and humans. The inability of conventional water treatment systems to remove these compounds creates the need for new treatment systems in order to deal with these class of compounds. This review focuses on advanced oxidation processes that employ graphene-based composites as catalysts for the degradation of pharmaceuticals. These composites have been identified to possess enhanced catalytic activity due to increased surface area and reduced charge carrier recombination. The techniques employed in synthesizing these composites have been explored and five different advanced oxidation processes—direct degradation process, chemical oxidation process, photocatalysis, electrocatalyis processes and sonocatalytic/sono-photocatalytic processes—have been studied in terms of their enhanced catalytic activity. Finally, a comparative analysis of the processes that employ graphene-based composites was done in terms of process efficiency, reaction rate, mineralization efficiency and time required to achieve 90% degradation.

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Fate and toxicity of pharmaceuticals in water environment: An insight on their occurrence in South Asia

Cited by 144 publications

References 180 publications

Novel organic assisted Ag-ZnO photocatalyst for atenolol and acetaminophen photocatalytic degradation under visible radiation: performance and reaction mechanism

Novel organic assisted Ag-ZnO photocatalyst for atenolol and acetaminophen photocatalytic degradation under visible radiation: performance and reaction mechanism

Performance Efficiency of Conventional Treatment Plants and Constructed Wetlands towards Reduction of Antibiotic Resistance

Graphene-Based Composites as Catalysts for the Degradation of Pharmaceuticals

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