Green synthesis of ZnO nanoparticles using Justicia adhatoda for photocatalytic degradation of malachite green and reduction of 4-nitrophenol

RSC Advances, Journal Year: 2025, Volume and Issue: 15(4), P. 2958 - 2980

Published: Jan. 1, 2025

Achieving the smallest crystallite/particle size of zinc oxide nanoparticles (ZnO NPs) reported to date, measuring 5.2/12.41 nm with Justicia adhatoda (J. adhatoda) leaf extract, this study introduces a facile green synthesis. Utilizing aqueous J. extract as both reducing and stabilizing agent, method leverages plant's rich phytochemical composition produce highly crystalline morphologically controlled ZnO NPs. This precise particle control highlights effectiveness synthesis process in morphological tuning. The synthesized NPs were thoroughly characterized using XRD, UV-vis spectroscopy, FTIR, FESEM, HRTEM, which collectively revealed superior crystallinity, morphology, unique surface properties conferred by bio-capping. photocatalytic performance these biogenic was evaluated for degradation two model pollutants: malachite (MG), synthetic dye, 4-nitrophenol (4-NP), toxic organic compound. exhibited exceptional efficiency, achieving 99.8% MG within 180 minutes demonstrating rapid reduction 4-NP 4-aminophenol reaction rate constant 0.245 min-1 under UV sunlight irradiation. Mechanistic studies attributed high reactive oxygen species (ROS) generation electron-hole pair interactions, supported improved charge separation area. work not only establishes potential adhatoda-mediated addressing persistent pollutants but also sets benchmark size-controlled By delivering scalable eco-friendly water remediation technologies, advances nanotechnology.

Language: Английский

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Graphitic Carbon Nitride/CeO2 Nanocomposite for Photocatalytic Degradation of Methyl Red

Water, Journal Year: 2025, Volume and Issue: 17(2), P. 158 - 158

Published: Jan. 9, 2025

Nanosized ceria (CeO2) and a graphitic carbon nitride-loaded (CeO2/GCN) nanocomposite were synthesized using straightforward efficient method characterized by XRD, FTIR, SEM, TEM, TGA, BET analyses. These techniques confirmed that CeO2 was effectively supported on the surface of GCN, with particle sizes CeO2/GCN composite in range 10–15 nm pore size 3.33 nm. The photocatalytic activity NPs degradation methyl red dye under sunlight radiation studied UV–visible spectroscopy. A noticeable shift compared to pure suggests reduction its band gap energy, calculated at 3.90 eV for 2.97 nanocomposite. This enhances process, achieving removal efficiency 99.92% within short irradiation time 40 min nanocomposite, 69.47% NPs. findings indicate nitride significantly properties

Language: Английский

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Cellulose Nanofiber-Reinforced γ-AlOOH Aerogels for Enhanced Removal of Environmental Pollutants

Langmuir, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 29, 2025

In this study, we report the modification of a monolithic γ-aluminum oxy-hydroxide (γ-AlOOH) aerogel with cellulose nanofibers (CNFs) using sol-gel method via supercritical drying. The optimized 2% CNF (w/w) results in CNF-γ-AlOOH that is amorphous nature, along C-C and C-O-C functional groups. Transmission electron microscopy (TEM) images as-synthesized showed embedded γ-AlOOH aerogel. adsorption capacities were determined azo dyes: methylene blue (MB) crystal violet (CV), heavy metal ions: lead [Pb(II)], uranium [U(VI)], arsenic [As(III)] as models for environmental pollutants. maximum 210 mg/g CV, 204 MB, 105 As(III), 339 U(VI) at pH 7, whereas Pb(II) exhibited capacity 100 5. This attributed to synergistic interactions between hydroxyl groups active sites, facilitating electrostatic coordination interactions. aerogels demonstrated high recyclability, retaining over 94% efficiency after five cycles offering sustainable approach remediation. These findings establish robust, eco-friendly materials water treatment applications, potential scalability addressing diverse Future research should explore their application removal emerging contaminants optimize synthesis household industrial-scale implementation.

Language: Английский

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Carbon nanotubes for dye removal: A comprehensive study of batch and fixed-bed adsorption, toxicity, and functionalization approaches

Journal of Water Process Engineering, Journal Year: 2024, Volume and Issue: 67, P. 106193 - 106193

Published: Sept. 27, 2024

Language: Английский

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Effects of bioplastics and their leachates on marine bacterial communities

Water Research, Journal Year: 2025, Volume and Issue: 281, P. 123584 - 123584

Published: April 6, 2025

Language: Английский

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Aluminum Oxide Coatings as Nanoadsorbents for the Treatment of Effluents Colored with Eriochrome Black T

Coatings, Journal Year: 2025, Volume and Issue: 15(4), P. 488 - 488

Published: April 20, 2025

The contamination of water bodies with toxic compounds from the agricultural, industrial, and domestic sectors is a serious environmental problem. Adsorption one simplest, most functional, economical methods for treating large volumes removing its contaminant load. Thanks to nanoporous structure, versatility, chemical inertness, low-cost synthesis, anodic aluminum oxide (AAO) can be used as an adsorbent in wide range applications. In this work, nanostructured AAO coatings were successfully synthesized, their performance adsorbents was evaluated decolorization tests Eriochrome Black T (EBT) solutions. adsorption process found dependent on initial dye concentration, agitation, temperature, contact time. At 25 °C 16 mg·L−1 EBT maximum removal efficiency (%R) 78% obtained after 4.5 h at 500 rpm 5.5 100 rpm, while without 8.3 treatment, highest %R 40%. Furthermore, rate increased significantly reaching 99% 2.25 60 rpm. Additionally, it demonstrated that up four times greater than 50%.

Language: Английский

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Magnetic Photocatalyst Nanocomposite Based on MnFe₂O₄@ZnO for AZO Dye Degradation

ACS Omega, Journal Year: 2025, Volume and Issue: 10(17), P. 17595 - 17610

Published: April 26, 2025

This work focuses on fabricating a photocatalyst nanocomposite based MnFe2O4@ZnO for degrading Red Amaranth azo dye. Manganese ferrite (MnFe2O4) magnetic nanoparticles were synthesized via hydrothermal method, while ZnO thin film, acting as the photoactive layer, was deposited cores using atomic layer deposition (ALD) technique. X-ray diffraction (XRD) confirmed spinel structure of MnFe2O4 and hexagonal wurtzite phase ZnO. The crystallite size, determined from (311) peak, 36.5 nm; this value consistent with average size 33.2 nm measured by transmission electron microscopy (TEM). Magnetic characterization vibrating sample magnetometry (VSM) at room temperature revealed superparamagnetic behavior, very small hysteresis loop. coating, achieved 200 ALD cycles, resulted in degradation efficiency ηeff approximately 60% Finite-difference time-domain (FDTD) simulations provided theoretical insights into electromagnetic interactions driving photodegradation process, supporting UV-vis absorbance data AZO can be considered soft material that offers promising applications nanotechnology environmentally friendly wastewater treatment remediation.

Language: Английский

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Azo Dyes and the Microbial World: Synthesis, Breakdown, and Bioactivity

Microbiology Research, Journal Year: 2025, Volume and Issue: 16(5), P. 100 - 100

Published: May 16, 2025

This review discusses natural and synthetic azo compounds found in bacteria, fungal endophytes, fungi, plants, invertebrates. More than 100 of these have demonstrated significant pharmacological activity, including antitumor, antimicrobial, antibacterial effects. Using mathematical algorithms the PASS program, researchers predict new potential applications based on their structure–activity relationships. emphasizes importance as promising drug prototypes key players discovery. It also explores synthesis degradation dyes uses medicine, food, cosmetics, related fields. Additionally, role microorganisms producing counterparts is examined, showcasing development human health advancements.

Language: Английский

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A Sustainable Solution for the Adsorption of C.I. Direct Black 80, an Azoic Textile Dye with Plant Stems: Zygophyllum gaetulum in an Aqueous Solution

Molecules, Journal Year: 2024, Volume and Issue: 29(20), P. 4806 - 4806

Published: Oct. 11, 2024

The presence of pollutants in water sources, particularly dyes coming by way the textile industry, represents a major challenge with far-reaching environmental consequences, including increased scarcity. This phenomenon endangers health living organisms and natural system. Numerous biosorbents have been utilized for removal from industry. aim this study was to optimize discarded Zygophyllum gaetulum stems as constituting an untreated biosorbent efficient C.I. Direct Black 80, azo dye, aqueous solution, thus offering ecological low-cost alternative while recovering waste reuse. subjected series characterization analyses: scanning electron microscopy (SEM), thermogravimetric analysis (TGA), Brunauer–Emmett–Teller (BET) method, X-ray diffraction (XRD), infrared spectroscopy (IR) were employed characterize biosorbent. Additionally, moisture ash content plant stem also examined. absorption studied several different parameters effect time (0 360 min), sorbent mass (3 40 g/L), pH solution 11), dye concentration (5 300 mg/L), zero-charge point (2–12). Thermodynamic studies desorption carried out. results showed that increase 3 g/L resulted notable enhancement adsorption rates, observed rise 63.96% 97.08%. at (pHpzc) determined be 7.12. percentage found highest values ≤ 7, subsequent decline efficiency increased. Following initial amount adsorbed equilibrium reached within 2 h contact. kinetic investigated using pseudo-first-order, pseudo-second-order Elovich models. indicated pseudo-first-order model most appropriate adsorbent. isotherm Langmuir, Frendlich, Temkin, Dubinin–Radushkevich experimental data more satisfactory better fitted Langmuir on plant. demonstrated could effective adsorbent our organic solution.

Language: Английский

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Preparation of Co _x Mg _y Cu _{(1- x - y )} Fe ₂ O ₄ nanoparticles and their adsorption mechanism of methyl blue

Journal of Dispersion Science and Technology, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 13

Published: Aug. 30, 2024

A facile rapid-combustion process was introduced for preparing magnetic CoxMgyCu(1-x-y)Fe2O4 nanoparticles, and to enhance their specific surface area saturation magnetization, the optimization involved adjusting element proportion, calcination temperature, solvent amount. The optimal proportion of x:y:(1-x-y) nanoparticles 0.1:0.7:0.2, effects amount, temperature were also investigated. average particle size Co0.1Mg0.7Cu0.2Fe2O4 calcined at 400 °C with 25 mL absolute alcohol 17.9 nm 56.96 m2/g, respectively; while demonstrating a magnetization 8.5 emu/g. To solve increasingly severe issue water pollution, these employed efficiently treat dye wastewater containing methyl blue (MB). After fitting kinetic isotherm models, adsorption MB dominated by chemisorption multilayer process. experiments revealed remarkable maximum capacity blue, reaching 2255.7 mg/g, within concentration range from 4000 mg/L. thermodynamic analysis indicated spontaneity exothermic studies on effect pH led satisfying results; residual could still remain 91.2% initial adsorbance after 12 times recycle. outstanding recycling ability, resistance ionic strength, distinguished among vast adsorbents. These results highlight significant potential treating wastewater.

Language: Английский

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