Hydrothermal Synthesis of Hierarchical Copper Oxide Nanoparticles and its Potential Application as Adsorbent for Pb(II) with High Removal Capacity

Kumar, K. Yogesh; Muralidhara, H. B.; Nayaka, Y. Arthoba; Hanumanthappa, Harish; Veena, M. S.; Kumar, S. R. Kiran

doi:10.1080/01496395.2014.922101

Cited by 26 publications

(9 citation statements)

References 47 publications

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“…Mainly monoclinic CuO exhibits higher physical and chemical properties, electrochemical activity, thermal conductivity, and stability in solutions, as well as lower production cost [29,30]. Research studies concerning CuO include CuO as a photocatalyst for the removal of pollutants, and for water splitting [31,32]. Copper oxides have been synthesized electrochemically, physically, and chemically, such by spray pyrolysis, the sol-gel method, chemical vapor deposition, pulsed laser deposition, sputtering, and electrochemical deposition [33][34][35][36][37][38].…”

Section: Copper Oxides Photocatalystsmentioning

confidence: 99%

Fabrication and Characterization of a Marine Wet Solar Cell with Titanium Dioxide and Copper Oxides Electrodes

2022

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One of the effective ways of utilizing marine environments is to generate energy, power, and hydrogen via the effect of photocatalysts in the seawater. Since the ocean is vast, we are able to use its large area, but the power generation system must be of low cost and have high durability against both force and corrosion. In order to meet those requirements, this study focuses on the fabrication of a novel marine wet solar cell composed of a titanium dioxide photoanode and a copper oxide photocathode. These electrodes were deposited on type 329J4L stainless steel, which possesses relative durability in marine environments. This study focuses on the characterization of the photocatalytic properties of electrodes in seawater. Low-cost manufacturing processes of screen-printing and vacuum vapor deposition were applied to produce the titanium dioxide and copper oxides electrodes, respectively. We investigated the photopotential of the electrodes, along with the electrochemical properties and cell voltage properties of the cell. X-ray diffraction spectroscopy (XRD) of the copper oxides electrode was analyzed in association with the loss of photocatalytic effect in the copper oxides electrode. Although the conversion efficiency of the wet cell was less than 1%, it showed promising potential for use in marine environments with low-cost production. Electrochemical impedance spectroscopy (EIS) of the cell was also conducted, from which impedance values regarding the electrical properties of electrodes and their interfaces of charge-transfer processes were obtained. This study focuses on the early phase of the marine wet solar cell, which should be further studied for long-term stability and in actual marine environmental applications.

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Section: Copper Oxides Photocatalystsmentioning

confidence: 99%

Fabrication and Characterization of a Marine Wet Solar Cell with Titanium Dioxide and Copper Oxides Electrodes

2022

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“…Chemical methods, undoubtedly, are the widely used conventional methods used for metallic nanoparticles synthesis. A number of chemical methods have been reported for CuO nanoparticles including hydrothermal, , solvothermal, sonochemical, mechanochemical, reverse microemulsion, and a few other methods. The most common approach for the synthesis of copper oxide nanoparticles is chemical reduction of the copper salt precursor by organic and inorganic reducing agents.…”

Section: Fabrication Techniquesmentioning

confidence: 99%

Synthesis and Biomedical Applications of Copper Oxide Nanoparticles: An Expanding Horizon

Verma

Kumar

2019

ACS Biomater. Sci. Eng.

289

101

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Synthesis of copper oxide nanoparticles with tunable size and desirable properties is a foremost thrust area of the biomedical research domain. Though these features primarily rely on the synthetic approaches involved, with advancements in this area, it has been documented that the synthesis parameters and surface modifiers have a direct impact on the morphology and eventually on the biomedical properties. “Sensing” remains a major application of nanomaterials owing to their small size and unusual physicochemical properties, but in the past few years, a paradigm shift has occurred toward “theranostic” combination of the sensing and therapeutic features on a single platform. Copper oxide nanoparticles have been efficiently used for sensing and targeting in both in-vivo and in-vitro environments, although few key challenges are yet to be resolved before implementing at a commercial level. This review article attempts to summarize the recent advancements in the various synthetic approaches toward copper oxide nanoparticles and their biomedical applications. It highlights various synthetic methodologies including electrochemical, chemical, and biogenic methods, the role of surface modifiers in growth mechanisms, and their impact on biomedical applications. Finally, the current status, key challenges, and future perspective of copper oxide nanoparticles will be discussed that inevitably have an impact on their current and future scenarios.

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“…Chemical redox methods yield enormous precipitates and slurries, while ion exchange and reverse osmosis entail high initial and operation costs. In comparison, adsorption processes appear promising and reliable for toxic metal removals . General criteria for adsorbent selection include efficiency, capacity and regenerability.…”

Section: Background Informationmentioning

confidence: 99%

“…Adsorbent regeneration and metal recovery can be simultaneously accomplished by relatively short‐duration exposures to solutions at appropriate pH . Several investigators have reported that IOCS sorbent is a stable filtration medium with a long life span or sustainability, and excellent regenerability, with relatively small or negligible iron losses over treatment, regeneration, and back‐washing operations, an important consideration for commercial applications …”

Section: Background Informationmentioning

confidence: 99%

Modeling and performance prediction of chromate reduction by iron oxide coated sand in adsorber reactors

2016

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Iron oxide coated sand (IOCS) as an adsorbent medium for removing hexavalent chromium (Cr(VI)) from industrial wastewater, as well as in permeable reactive barriers for remediation of Cr(VI) in aquifers is investigated in this study. An important feature was the use of a mathematical model for performance forecasting and process upscaling of IOCS fixed-bed adsorber systems for Cr(VI) removal. Another significance aspect was the elucidation of IOCS surface mechanisms and interactions responsible for Cr(VI) sorption and reduction to the less toxic Cr(III). The adsorption equilibrium and mass-transfer parameters for modeling were obtained from independent laboratory studies. Adsorber studies validated the predictive model and established the effectiveness of IOCS for Cr(VI) removal under different conditions. Model simulation studies demonstrated that adsorbent capacity, surface diffusion, and film transfer significantly influenced process dynamics. The study showed that IOCS can be used to remove Cr(VI) from contaminated waters, meeting the overall objectives of regulatory agencies. V C 2016 American Institute of Chemical Engineers AIChE J, 00: 000-000, 2016 Keywords: adsorption/liquid, diffusion (microporous), environmental engineering, mathematical modeling, mass transfer IntroductionThe removal of toxic contaminants from the scarce potable water sources is a major concern for public and private utilities. Hexavalent chromium or Cr(VI) is one such toxic contaminant found globally in aquifers owing to anthropogenic activities; and hence effective, efficient and economical technologies are essential for its removal from contaminated waters and industrial wastewaters to protect public health. Such technologies include chemical redox followed by precipitation, ion exchange, adsorption, and reverse osmosis; and most of them have serious drawbacks, although adsorption appears the most promising and reliable.1 A major challenge is the choice of an ideal adsorbent that not only possesses high sorption capacities for target pollutants, but also has amenability to regeneration. Activated carbons with high BrunauerEmmett-Teller (BET) surface areas are efficient in sorption of toxic metals; nevertheless, regeneration of spent carbons involves high temperatures and excessive energies. Adsorbents such as peat and sawdust are effective in chromium removal, 2,3 but are not amenable to regeneration. These factors have provided the impetus to synthesis of new materials with better capacity and regenerability.Iron oxide coated sand (IOCS) has been used as an efficient, versatile and cost-effective adsorbent for toxic metal removal in water treatment applications. 4,5 Iron oxide surfaces are physically and chemically heterogeneous, and its characteristics change with time, particularly its porosity and specific surface area. It has sufficient mesopores and high levels of micropores to facilitate penetration and sorption of ions at high capacities. 6 The adsorbent can reduce metal-bound organic or inorganic complexes typically poorly...

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Hydrothermal Synthesis of Hierarchical Copper Oxide Nanoparticles and its Potential Application as Adsorbent for Pb(II) with High Removal Capacity

Cited by 26 publications

References 47 publications

Fabrication and Characterization of a Marine Wet Solar Cell with Titanium Dioxide and Copper Oxides Electrodes

Fabrication and Characterization of a Marine Wet Solar Cell with Titanium Dioxide and Copper Oxides Electrodes

Synthesis and Biomedical Applications of Copper Oxide Nanoparticles: An Expanding Horizon

Modeling and performance prediction of chromate reduction by iron oxide coated sand in adsorber reactors

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