Papers by Mallikarjuna Nadagouda
Nanomaterials
Advanced materials related to sensing, actuation, catalysis, and other functionalities for intera... more Advanced materials related to sensing, actuation, catalysis, and other functionalities for interactive devices depend on surface interactions and quantum effects in solids [...]
ACS Omega, 2021
A variety of methods, including chemical precipitation, biological phosphorus elimination, and ad... more A variety of methods, including chemical precipitation, biological phosphorus elimination, and adsorption, have been described to effectively eliminate phosphorus (P) in the form of phosphate (PO 4 3−) from wastewater sources. Adsorption is a simple and easy method. It shows excellent removal performance, cost effectiveness, and the substantial option of adsorbent materials. Therefore, it has been recognized as a practical, environmentally friendly, and reliable treatment method for eliminating P. Nanocomposites have been deployed to remove P from wastewater via adsorption. Nanocomposites offer low-temperature alteration, high specific surface area, adjustable surface chemistry, pore size, many adsorption sites, and rapid intraparticle diffusion distances. In this Mini-Review, we have aimed to summarize the last eight years of progress in P removal using graphene-based composites via adsorption. Ultimately, future perspectives have been presented to boost the progress of this encouraging field.
Membranes, 2022
Municipal wastewater has been identified as a potential source of natural phosphorus (P) that is ... more Municipal wastewater has been identified as a potential source of natural phosphorus (P) that is projected to become depleted in a few decades based on current exploitation rates. This paper focuses on combining a bench-scale anaerobic/anoxic/aerobic membrane bioreactor (MBR) and magnesium carbonate (MgCO3)-based pellets to effectively recover P from municipal wastewater. Ethanol was introduced into the anoxic zone of the MBR system as an external carbon source to improve P release via the enhanced biological phosphorus removal (EBPR) mechanism, making it available for adsorption by the continuous-flow MgCO3 pellet column. An increase in the concentration of P in the MBR effluent led to an increase in the P adsorption capacity of the MgCO3 pellets. As a result, the anaerobic/anoxic/aerobic MBR system, combined with a MgCO3 pellet column and ethanol, achieved 91.6% P recovery from municipal wastewater, resulting in a maximum P adsorption capacity of 12.8 mg P/g MgCO3 through the cont...
Magnetic manganese ferrites were created in the laboratory using a novel combustion method in ord... more Magnetic manganese ferrites were created in the laboratory using a novel combustion method in order to blend the catalytic properties of manganese (Mn) with the magnetic and structural properties of ferrites. The developed synthesis method involved mixing Mn and iron (Fe) nitrate (NO3) salts with polyvinyl alcohol (PVA) followed by calcination. The resulting synthesis method is a scaleable and a simplified synthesis pathway. Preparation studies varying the Mn:Fe stoichiometric ratio and PVA content during synthesis revealed that PVA content above 1:1.5 NO3:PVA is required to form manganese ferrites. XRD, SEM-EDS, carbon content, and BET surface area analysis confirmed that the developed method yielded manganese ferrites of the form Mn2.5Fe0.5O4, MnFe2O4, and Mn0.5Fe2.5O4. The manganese ferrites were then used to remove methylene blue dye from an aqueous solution as a proof-of-concept study to demonstrate their reactivity and use as a treatment technology.
Journal of Environmental Engineering, 2020
The special collection on Virus Monitoring and Removal in Natural and Built Systems is available ... more The special collection on Virus Monitoring and Removal in Natural and Built Systems is available in the ASCE Library (https:// ascelibrary.org/joeedu/virus_monitoring_built_systems). The purpose of this special collection is to highlight the work of the environmental engineering community on detecting, quantifying, and tracking viruses in the environment as well as on removing viruses in natural and engineered treatment systems. The 23 papers that comprise the collection at the time of its first publication were selected from among those published in ASCE journals over the last two decades (2000-2020). The present collection draws on studies published in four ASCE journals:
Science of The Total Environment, 2021
Highlights • The ubiquitous presence of natural and synthetic nanomaterials in the environment • ... more Highlights • The ubiquitous presence of natural and synthetic nanomaterials in the environment • Nanomaterials influence on the natural ecosystem. • Exposure pathways and life cycle of nanomaterials in the human body • Nanotoxicity of nanomaterials on human health digitalcommons.unl.edu
Following a pH reduction in their drinking water over a span of more than 20 years, the City of N... more Following a pH reduction in their drinking water over a span of more than 20 years, the City of Newark, New Jersey, has struggled with elevated lead (Pb) release from Pb service lines and domestic plumbing in the zone fed by the Pequannock Water Treatment Plant. In response, Newark initiated orthophosphate addition and provided faucet-mounted point-of-use (POU) filters and pitcher filters certified for Pb and particulate reduction under NSF/ANSI Standards 53 and 42 to residential homes in that zone. Water chemistry analysis and size fractionation sampling were
Journal of Hazardous Materials, 2019
Fenton processes are promising wastewater treatment alternatives for bio-recalcitrant compounds. ... more Fenton processes are promising wastewater treatment alternatives for bio-recalcitrant compounds. Three different methods (i.e., reverse microemulsion, sol-gel, and combustion) were designed to synthesize environmentally friendly ferrites as magnetically recoverable catalysts to be applied for the decomposition of two pharmaceuticals (ciprofloxacin and carbamazepine) that are frequently detected in water bodies. The catalysts were used in a heterogeneous solar photo-Fenton treatment to save the cost of applying high-energy UV radiation sources, and was performed under a slightly basic pH to avoid metal leaching and adding salts for pH adjustment. All the developed catalysts resulted in the effective treatment of ciprofloxacin and carbamazepine in both synthetic and real domestic wastewater. In particular, the sol-gel synthesized ferrite was more magnetic and more suitable for reuse. The degradation pathways of both compounds were elucidated for this treatment. The degradation of ciprofloxacin involved attacks to the quinolone and piperazine rings. The degradation pathway of carbamazepine involved the formation of hydroxyl carbamazepine and dihydroxy carbamazepine before yielding acridine by hydrogen abstraction, decarboxylation, and amine cleavage, which would be further oxidized.
ChemCatChem, 2019
This is the peer reviewed version of the following article:-Near UV-irradiation of CuOx impregnat... more This is the peer reviewed version of the following article:-Near UV-irradiation of CuOx impregnated TiO 2 provides active species for hydrogen production through methanol photoreforming-ChemCatChem 2019, 11, 4314-4326, which has been published in final form at
Water Environment Research, 2017
Nonselective oxidation of organic chemicals during TiO 2 photocatalytic water treatment significa... more Nonselective oxidation of organic chemicals during TiO 2 photocatalytic water treatment significantly prohibits decomposition of toxic target contaminants, particularly in the presence of naturally abundant less toxic natural organic matter (NOM). To minimize the adverse effect of NOM, the authors have investigated physical size exclusion of large NOM onto mesoporous TiO 2 photocatalysts, which allows small target contaminants to selectively access the porous structure for subsequent chemical reaction. Various treatment scenarios tested with different targets (ibuprofen, microcystin-LR) and competitors (humic acid, polyethylene glycol), and a series of mesoporous TiO 2 materials proved the size exclusion mechanism. Discussion was made on the impact of the porous structure of TiO 2 on selectivity and reactivity, considering size difference among targets , TiO 2 pores , competitors as well as mass transfer limitation of even a target to small pores. This simple approach would greatly improve the photocatalytic treatment of toxic chemicals in water containing NOM. Water
Water, 2018
Various compositions of barium carbonate (BaCO3) loaded polycaprolactone (PCL) composites were pr... more Various compositions of barium carbonate (BaCO3) loaded polycaprolactone (PCL) composites were prepared, including 2.5/97.5, 10/90, 30/70, 50/50 and 90/10 (PCL/BaCO3), via re-precipitation technique. Small-scale column tests were conducted to study the efficiency of sulfate removal using the PCL/BaCO3 composites. The composites before and after their use to remove sulfate were extensively characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), high-resolution TEM (HR-TEM), and thermogravimetric analysis (TGA). As PCL is a biodegradable polymer, these composites are environmentally friendly and have several advantages over barium sulfate precipitation in overcoming clogging issues in filters or resins due to collection of natural organic matter (NOM). The media used in this study exhibited high capacity and was able to remove more than 90% sulfate from synthetic sulfate containing w...
Water Science and Technology: Water Supply, 2017
Harmful algal blooms (HABs) found in various water bodies worldwide have been a huge concern due ... more Harmful algal blooms (HABs) found in various water bodies worldwide have been a huge concern due to their adverse impacts on human health and ecosystems. In particular, HABs associated with cyanobacteria have been of great interest because of their potential to generate and release biological toxins, especially, lethal microcystins (MCs). The overall goal of this study was to develop a new sustainable approach to decompose MCs, preferably on-site and in real-time with minimal effort, fewer chemicals, and low energy inputs. To achieve the goal, a high efficiency nitrogen-doped TiO2 photocatalytic film immobilized onto a glass substrate was fabricated via integrated sol-gel synthesis employing nitrogen-containing surfactants as pore-templating agent and nitrogen-dopant. The film exhibited visible light-activated, nanoporous, and transparent properties. Effects of surfactant type, calcination temperature, coating layers, and reaction pH on the photocatalytic decomposition of microcysti...
ACS Sustainable Chemistry & Engineering, 2017
Bimetallic CuAg@g-C 3 N 4 catalyst system has been designed and synthesized by impregnating coppe... more Bimetallic CuAg@g-C 3 N 4 catalyst system has been designed and synthesized by impregnating copper and silver nanoparticles over the graphitic carbon nitride surface. Its application has been demonstrated in the hydroxylation of benzene under visible light.
Journal of Nanostructure in Chemistry, 2017
Nanomaterials have been extensively studied for heavy metal ions and dye removals from wastewater... more Nanomaterials have been extensively studied for heavy metal ions and dye removals from wastewater. This article reviews the role of nanomaterials as effective adsorbents for wastewater purification. In recent years, numerous novel nanomaterial adsorbents have been developed for enhancing the efficiency and adsorption capacities of removing contaminants from wastewater. The innovation, forthcoming development, and challenges of cost-effective and environmentally acceptable nanomaterials for water purification are discussed and reviewed in this article. This review concludes that nanomaterials have many unique morphological and structural properties that qualify them to be used as effective adsorbents to solve several environmental problems.
Scientific reports, Dec 19, 2016
Sulfonation of graphitic carbon nitride (g-CN) affords a polar and strongly acidic catalyst, Sg-C... more Sulfonation of graphitic carbon nitride (g-CN) affords a polar and strongly acidic catalyst, Sg-CN, which displays unprecedented reactivity and selectivity in biodiesel synthesis and esterification reactions at room temperature.
Green Chemistry, 2017
Sulfonated graphitic carbon nitride (Sg-CN) is synthesized and deployed in the conversion of carb... more Sulfonated graphitic carbon nitride (Sg-CN) is synthesized and deployed in the conversion of carbohydrates to furanics; enhanced acidity and stability of Sg-CN are exploited for converting carbohydrates to biologically important scaffolds and platform chemicals.
Green Chemistry, 2016
A titanium-based zeolitic imidazolate framework (Ti-ZIF) with a high surface area and porosity ha... more A titanium-based zeolitic imidazolate framework (Ti-ZIF) with a high surface area and porosity has been synthesized and its application has been demonstrated in the synthesis of cyclic carbonates from carbon dioxide.
Tetrahedron, 2017
The titanium cluster with the reduced band gap has been synthesized having the palladium nanopart... more The titanium cluster with the reduced band gap has been synthesized having the palladium nanoparticles over the surface, which not only binds to the atmospheric oxygen but also catalyzes the oxidation of alcohols under visible light.
ACS Sustainable Chemistry & Engineering, 2016
A highly selective and sustainable method has been developed for the oxidation of methyl arenes a... more A highly selective and sustainable method has been developed for the oxidation of methyl arenes and their analogues. The VO@g-C3N4 catalyst is very efficient in the C–H activation and oxygen insertion reaction resulting in formation of the corresponding carbonyl compounds and phenols.
Green Chemistry, 2016
A bimetallic catalyst, AgPd@g-C3N4, on graphitic carbon nitride enables the concerted reductive f... more A bimetallic catalyst, AgPd@g-C3N4, on graphitic carbon nitride enables the concerted reductive formylation of aromatic nitro compounds under photo-chemical conditions; formic acid serves the dual role of a hydrogen source and a formylating agent.
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Papers by Mallikarjuna Nadagouda