Synthesis of two different zinc oxide nanoflowers and comparison of antioxidant and photocatalytic activity

Eskikaya, Ozan; Özdemir, Sadin; Tollu, Gülşah; Dizge, Nadir; Ramaraj, Rameshprabu; Manivannan, Arthi

doi:10.1016/j.chemosphere.2022.135389

Cited by 31 publications

(12 citation statements)

References 49 publications

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“…Furthermore, colors are difficult to biodegrade [7][8][9] Pollutant removal from drinking water and municipal wastewater treatment plants is dependent on the contaminants physicochemical properties as well as the treatment procedures. 10 For this reason, many processes are used and developed for the treatment of wastewater such as coagulationflocculation, 11,12 membrane, 13 photocatalytic, 14,15 electrochemical systems, 16,17 and adsorption. 18 Adsorption is a physicochemical mass transfer event that occurs when a liquid is deposited or adsorbed on the surface of a solid phase.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Direct Orange 46 and phosphate ions on waste tomato stem ash used as a bio‐based adsorbent

Eskikaya

Arslan

Gün

et al. 2023

Env Prog and Sustain Energy

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It is necessary to use adsorbents derived from natural materials, such as biosorbents since they do not any damage to the environment, for pollutants elimination that contaminate the aquatic environment. Since the deficiency in the literature was determined in the study in which only the adsorbent obtained from tomato stem was used before this study, a waste material with tomato stem was selected as a natural adsorbent without chemical compounds. Phosphate and dye contaminants, which are often present in industrial and municipal wastewater, were eliminated by adsorption process. Fourier transform infrared (FTIR), x‐ray fluorescence (XRF), Zeta potential, and scanning electron microscope (SEM) with energy dispersive x‐ray (EDX) spectroscopy were used to analyze tomato stems. The tomato stems resulted in high pollutants removal efficiencies recording 99.31% of phosphate () removal efficiency and 99.44% of Direct Orange 46 (DO 46) dye removal efficiency at optimal conditions. The best conditions for phosphate adsorption were pH = 6.0, 2.0 g/L of tomato stems concentration, 50 mg/L initial phosphate concentration and a contact time of 120 min resulting in an adsorption capacity of 4.24 mg/g. The best conditions for DO 46 adsorption were pH = 12, 2.0 g/L of adsorbent concentration, initial dye of 200 mg/L concentration and a contact time of 120 min (q = 13.76 mg/g). For both adsorption experiments, the adsorbent size was chosen to be less than 500 μm. As a result of the adsorption experiments on tomato stem ash, Freundlich isotherm (R2: 0.94) was suitable for DO 46 dye adsorption and Temkin isotherm (R2: 0.99) was suitable for elimination. The phosphate (R2: 0.97) and dye (R2: 1) adsorption onto tomato stem ash was explained using a pseudo‐second‐order kinetic model. It has been determined that the adsorption of the DO 46 dye with the tomato stem ash is an exothermic (∆H: −3.174) process that occurs naturally due to its nature (∆G: −8.41). On the other hand, it was determined that the adsorption of was spontaneous (∆G: −5.21) and endothermic (∆H: 5.7357). According to the adsorption results obtained in this study, it is appropriate to use the tomato stem, which is generated as waste, as an adsorbent. It is thought that obtaining from bio‐based waste in the removal of pollutants such as dye and phosphate in water will both reduce the cost and create an advantage in terms of biodegradability.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Direct Orange 46 and phosphate ions on waste tomato stem ash used as a bio‐based adsorbent

Eskikaya

Arslan

Gün

et al. 2023

Env Prog and Sustain Energy

Self Cite

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“…The scavenging activity observed underscores the extract’s ability to neutralize harmful radicals, suggesting a role in mitigating oxidative stress-related disorders. [ 10 11 ]…”

Section: Discussionmentioning

confidence: 99%

Phytochemical Screening and Anti-Inflammatory and Anti-Oxidant Activities of Spermacoce Hispida Ethanolic Extract

Nithin Krishna,

Krishnamoorthy,

Veeraraghavan

et al. 2024

Journal of Pharmacy and Bioallied Sciences

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Background: Spermacoce hispida, a medicinal plant from the Rubiaceae family, has garnered attention for its traditional use and reported therapeutic properties. This study aimed to investigate the phytochemical composition and assess the anti-inflammatory and anti-oxidant activities of the ethanolic extract derived from Spermacoce hispida. Materials and Methods: Phytochemical screening of the ethanolic extract involved qualitative analysis to identify major phytoconstituents such as tannins, phenols, and acids. The anti-inflammatory activity was evaluated through in vitro assays, and anti-oxidant potential was assessed using established methods to measure scavenging activity against free radicals and reactive oxygen species. Results: Phytochemical screening revealed the presence of various bioactive constituents in the Spermacoce hispida ethanolic extract, including acid, tannin, protein, and phenolic compounds. Furthermore, the extract exhibited potent anti-oxidant activity, as evidenced by its ability to scavenge free radicals and attenuate ROS-induced oxidative stress. Conclusion: The findings of this study underscore the potential of Spermacoce hispida ethanolic extract as a source of bioactive compounds with anti-inflammatory and anti-oxidant properties. The presence of phytochemicals and the observed bioactivity support its traditional use and suggest potential therapeutic applications. These results contribute to the growing body of knowledge on natural products with health-promoting effects and provide a basis for further research aimed at developing pharmaceutical and medicinal interventions harnessing the benefits of Spermacoce hispida.

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“…To date, several studies have demonstrated the antimicrobial and antibiofim activity of different nanomaterials, such as silver, gold, copper, zinc, iron, and magnesium oxide [ 20 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 ]. Furthermore, gold nanomaterials have attracted tremendous attention in fighting against the pathogens due to unique properties such as size, shape, surface and optical properties, low toxicity, ease of synthesis, and high stability [ 21 , 81 ].…”

Section: Discussionmentioning

confidence: 99%

Green Synthesis of Gold Nanoflowers Using Rosmarinus officinalis and Helichrysum italicum Extracts: Comparative Studies of Their Antimicrobial and Antibiofilm Activities

et al. 2022

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This study was concerned with the green synthesis of gold nanoflowers (AuNFs) using the bioactive constituents of Rosmarinus officinalis (rosemary) and Helichrysum italicum (immortelle) extracts, as reducer and stabilizer agents along with the determination of their antibacterial and antibiofilm activity against E. coli, S. aureus, and S. epidermidis. The AuNFs were characterized using STEM, UV–Vis, DLS, ZETA, FESEM-EDX, and FTIR techniques. The antibacterial and antibiofilm activity of the AuNFs were evaluated by microdilution broth and microtiter plate (MTP) tests, respectively. STEM and DLS analysis confirmed the flower-like morphology of gold nanoparticle clusters of R. officinalis-AuNFs (R-AuNFs) and H. italicum-AuNFs (H-AuNFs) with a size of 20–130 nm and 15–90 nm, respectively. The MICs of R-AuNFs were found to be 40 µg/mL for E. coli and S. epidermidis and 160 µg/mL for S. aureus. The MICs of H-AuNFs against all bacterial strains were 20 µg/mL. All tested AuNFs exhibited a strong dose-dependent antibiofilm activity against the test strains, and H-AuNFs was more effective than R-AuNFs. The green synthesis of AuNFs from the rosemary and immortelle extracts can be applied as a potential agent to overcome the growth of biofilm-producing microorganisms in food industries.

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Synthesis of two different zinc oxide nanoflowers and comparison of antioxidant and photocatalytic activity

Cited by 31 publications

References 49 publications

Adsorption of Direct Orange 46 and phosphate ions on waste tomato stem ash used as a bio‐based adsorbent

Adsorption of Direct Orange 46 and phosphate ions on waste tomato stem ash used as a bio‐based adsorbent

Phytochemical Screening and Anti-Inflammatory and Anti-Oxidant Activities of Spermacoce Hispida Ethanolic Extract

Green Synthesis of Gold Nanoflowers Using Rosmarinus officinalis and Helichrysum italicum Extracts: Comparative Studies of Their Antimicrobial and Antibiofilm Activities

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