Green synthesized cobalt oxide nanoparticles with photocatalytic activity towards dye removal

Article Environmental Sciences

Superparamagnetic hematite spheroids synthesis, characterization, and catalytic activity

Ramesh Vinayagam et al.

Summary: The leaf extract of Muntingia calabura is used for the synthesis of superparamagnetic hematite nanoparticles. The nanoparticles exhibit highly crystalline and mesoporous structure and show promising catalytic performance.

CHEMOSPHERE (2022)

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Article Environmental Sciences

Assessment of inverse fluidized bed reactor on the treatment efficiency of distillery spent wash water

P. Balamurugan et al.

Summary: This study assessed the impact of four carrier materials on the treatment efficiency of distillery spent wash water using an Inverse Fluidized Bed Reactor (IFBR), revealing that expanded perlite was the most effective. The method could be easily implemented in industrial practice to reduce the negative environmental impact of production plants.

INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY (2022)

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Article Environmental Sciences

Adsorptive removal of Acid Blue 113 using hydroxyapatite nanoadsorbents synthesized using Peltophorum pterocarpum pod extract

Hriday Sodhani et al.

Summary: This study reports the green synthesis of hydroxyapatite (HAP) nanoadsorbents using Peltophorum pterocarpum pod extract. The prepared HAP nanoadsorbents showed high purity, needle-like aggregations, and crystalline nature. The optimization using Central Composite Design (CCD) resulted in high adsorption efficiency for the removal of Acid Blue 113 dye. The adsorption kinetics followed the pseudo second-order model and the equilibrium data fitted well with the Freundlich isotherm. The green HAP nanoadsorbents showed promising potential for environmental remediation applications.

CHEMOSPHERE (2022)

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Article Environmental Sciences

Adsorptive removal of AB113 dye using green synthesized hydroxyapatite/magnetite nanocomposite

Shraddha Pai et al.

Summary: In this study, magnetite nanoparticles synthesized using Thunbergia grandiflora leaf extract were doped with hydroxyapatite sourced from waste bivalve clamshells to produce a hydroxyapatite/magnetite nanocomposite. The nanocomposite showed a crystalline phase and irregular spherical particles. The presence of specific elements and functional groups was confirmed by EDAX and FTIR analysis. The composite exhibited a high adsorption efficiency for anionic dyes in wastewater.

ENVIRONMENTAL RESEARCH (2022)

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Article Environmental Sciences

Green synthesized hydroxyapatite nanoadsorbent for the adsorptive removal of AB113 dye for environmental applications

Ramesh Vinayagam et al.

Summary: This study successfully synthesized hydroxyapatite (HAp) using the green chemistry approach and the leaf extract of copper pod tree, and investigated its adsorption potential for Acid blue 113 (AB113) dye. The synthesized HAp exhibited rod-shaped morphology with prominent Ca and P elements. It had high crystallinity and thermal stability. The HAp suspension showed good stability with a Zeta potential of -17.7 mV. BET studies confirmed the mesoporous structure and a high specific surface area. The HAp's ability to adsorb AB113 was examined under various process parameters. Batch experiments revealed that optimal dye removal (92.72%) was achieved at pH 8, with a dosage of 1 g/L CP-HAp nps, 20 ppm AB113 concentration, 120 min contact time, 150 rpm agitation speed, and room temperature. The maximum adsorption capacity was determined as 120.48 mg/g. Different isotherms and kinetics were used to describe the adsorption behavior, with the Freundlich isotherm and pseudo-second-order kinetics showing good fitting. Thermodynamic investigations indicated that the adsorption process was spontaneous and exothermic. Overall, this study highlights the suitability of HAp nanoadsorbent for the removal of AB113 dye from wastestreams.

ENVIRONMENTAL RESEARCH (2022)

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Review Biology

Green fabrication of Co and Co3O4 nanoparticles and their biomedical applications: A review

Abdul Waris et al.

Summary: Nanotechnology involves the fabrication, characterization, and potential application of various materials at the nanoscale. Cobalt and cobalt oxide nanoparticles have attracted researchers due to their unique biomedical applications and other uses. A recent eco-friendly and simple method for synthesizing these nanoparticles using biotic resources offers advantages over other physicochemical methods.

OPEN LIFE SCIENCES (2021)

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Article Environmental Sciences

Influence of Elevated Temperature and Pressure on Treatment of Landfill Leachate by Potassium Ferrate(VI)

Maciej Thomas et al.

Summary: The study examined the impact of increased pressure and temperature on reducing COD values in landfill leachate, determining optimal treatment parameters using the Taguchi method, resulting in a reduction of color, COD, TOC, and TP by over 91%.

WATER AIR AND SOIL POLLUTION (2021)

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Article Chemistry, Physical

Green synthesis of Co3O4 nanoparticles by using walnut green skin extract as a reducing agent by using response surface methodology

Sayed Zia Mohammadi et al.

Summary: This study successfully synthesized cobalt oxide nanoparticles using walnut green skin extract as a reducing agent, and determined the properties of the particles and optimal synthesis parameters through a series of analyses.

SURFACES AND INTERFACES (2021)

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Article Engineering, Environmental

Application of Artificial Neural Network as a nonhazardous alternative on kinetic analysis and modeling for green synthesis of cobalt nanocatalyst from Ocimum tenuiflorum

Thiruselvi Devaraj et al.

Summary: This study analyzed the non-hazardous kinetic behavior and modeling of green-synthesized cobalt nanocatalyst using an Artificial Neural Network (ANN). The results showed that the ANN model effectively predicted the synthesis conditions and size of nanoparticles. Experimental results indicated that green synthesis reduced raw material costs by 30-40% and energy consumption by 60%.

JOURNAL OF HAZARDOUS MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Efficient photocatalytic degradation of Malachite green dye using facilely synthesized cobalt oxide nanomaterials using citric acid and oleic acid

Monu Verma et al.

Summary: Citric acid and oleic acid modified cobalt oxide nanomaterials were successfully prepared for photocatalytic degradation of malachite green dye. The synthesized nanomaterials were characterized for their structural, morphological, optical, functional, and thermal properties, with citric acid modification showing better photocatalytic performance.

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS (2021)

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Article Acoustics

Boosted sono-oxidative catalytic degradation of Brilliant green dye by magnetic MgFe2O4 catalyst: Degradation mechanism, assessment of bio-toxicity and cost analysis

Saptarshi Bose et al.

Summary: Magnetic MgFe2O4 nanoparticles were synthesized and used as catalyst for the degradation of Brilliant Green dye. The optimum conditions for highest degradation efficiency were determined to be MgFe2O4 catalyst dose of 1.0 g/L, PS dose of 300 mg/L, and initial dye concentration of 70 ppm under 15 min of ultrasound irradiation.

ULTRASONICS SONOCHEMISTRY (2021)

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Article Nanoscience & Nanotechnology

Swertia chirata extract mediated synthesis of iron oxide nanoparticles and its use as corrosion inhibitor for stainless steel 316 L in Ringer's solution

Pooja Sharma et al.

Summary: Iron oxide nanoparticles synthesized using Swertia chirata extract were used as a corrosion inhibitor for stainless steel in Ringer's solution, showing a concentration-dependent increase in inhibition efficiency. The spherical nanoparticles with sizes of 10-20 nm demonstrated a maximum corrosion inhibition of 78.37% at 100 ppm concentration, indicating their potential as a potent anti-corrosive agent in harsh body environments.

ADVANCES IN NATURAL SCIENCES-NANOSCIENCE AND NANOTECHNOLOGY (2021)

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Article Nanoscience & Nanotechnology

Facile synthesis of new composite, Ag-Nps-loaded core/shell CdO/Co3O4 NPs, characterization and excellent performance in antibacterial activity

A. M. Nassar et al.

Summary: A new type of composite Ag-NPs-loaded core/shell mixed oxides NPs, CdO/Co3O4, was successfully synthesized and characterized in this study. The composite materials were found to exhibit higher antibacterial activity against various bacterial strains compared to their precursor materials.

APPLIED NANOSCIENCE (2021)

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Article Chemistry, Multidisciplinary