Eco-friendly synthesis and photocatalytic application of flowers-like ZnO structures using Arabic and Karaya Gums

Araújo, Francisca Pereira de; Trigueiro, Pollyana; Honorio, Luzia M. C.; Oliveira, Danilo; Almeida, Luciano C.; Peña-Garcia, R.; Lobo, Anderson Oliveira; Cantanhêde, Welter; Silva-Filho, Edson C.; Osajima, Josy A.

doi:10.1016/j.ijbiomac.2020.10.132

Cited by 40 publications

(30 citation statements)

References 83 publications

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“…Acrylamide is a water-soluble substance and has high toxicity [ 84 ]. As evidenced in the results of Figure 9 , a survival rate of the nauplii above 80.0% was observed, even after 48 h of contact with extracts of the samples of hydrogels [ 85 , 86 , 87 , 88 , 89 ]. This result also suggests that acrylamide residues do not exist in the samples.…”

Section: Resultsmentioning

confidence: 85%

Superabsorbent Hydrogels Based to Polyacrylamide/Cashew Tree Gum for the Controlled Release of Water and Plant Nutrients

et al. 2021

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Agricultural production is influenced by the water content in the soil and availability of fertilizers. Thus, superabsorbent hydrogels, based on polyacrylamide, natural cashew tree gum (CG) and potassium hydrogen phosphate (PHP), as fertilizer and water releaser were developed. The structure, morphology, thermal stability and chemical composition of samples of polyacrylamide and cashew tree gum hydrogels with the presence of fertilizer (HCGP) and without fertilizer (HCG) were investigated, using X-ray diffractometry (XRD), Fourier Transformed Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA/DTG) and Energy Dispersive Spectroscopy (EDS). Swelling/reswelling tests, textural analysis, effect of pH, release of nutrients and kinetics were determined; the ecotoxicity of the hydrogels was investigated by the Artemia salina test. The results showed that PHP incorporation in the hydrogel favored the crosslinking of chains. This increased the thermal stability in HCGP but decreased the hardness and adhesion properties. The HCGP demonstrated good swelling capacity (~15,000 times) and an excellent potential for reuse after fifty-five consecutive cycles. The swelling was favored in an alkaline pH due to the ionization of hydrophilic groups. The sustained release of phosphorus in HCGP was described by the Korsmeyer–Peppas model, and Fickian diffusion is the main fertilizer release mechanism. Finally, the hydrogels do not demonstrate toxicity, and HCGP has potential for application in agriculture.

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Section: Resultsmentioning

confidence: 85%

Superabsorbent Hydrogels Based to Polyacrylamide/Cashew Tree Gum for the Controlled Release of Water and Plant Nutrients

et al. 2021

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“…The addition of AgNO 3 (an electron scavenger) and CH 3 OH (an • OH scavenger) reduced the degradation rate by 43% and 35% respectively. Therefore, the IBU degradation photoprocess seems to be more activated by the greater availability of h + in VB, as well as other processes that help in the formation of the H 2 Oand • OH radical [ 23 , 33 ]. These results contrast with the work of Xuet al [ 54 ], who observed that the activity of the holes to generate oxidative species was less efficient in the IBU photodegradation mechanism.…”

Section: Resultsmentioning

confidence: 99%

“…Previousauthors have evaluated material stability, such as Araújo et al, who investigated material stability through reuse/recycles in photocatalytic tests using Zno synthesized in the presence of polysaccharides [ 33 ]. Sa et al [ 24 ] evaluated this parameter inthe degradation of a bentazone herbicide.…”

Section: Resultsmentioning

confidence: 99%

“…The pH was around 3.7 to 10, and methyl alcohol (3.4 × 10 −3 mg/L), silver nitrate (5.0 × 10 −4 mol/L), and EDTA (2.4 × 10 −6 mol/L) were used as scavengers of hydroxyl radicals, electrons, and holes, respectively [ 27 , 32 ]. The amounts and concentrations of scavengers used were established according to previous studies [ 27 , 33 ]. The effect of hydrogen peroxide on the photodegradation of IBU in the 20 mgL −1 solution was studied by adding 0.5 mmol/L of H 2 O 2 using 0.5 gL −1 of the catalyst.…”

Section: Methodsmentioning

confidence: 99%

“…The toxicity of the IBU solution irradiated in bioassays with Artemia salina wasdetermined [ 34 ] with adaptations according to the procedure described by Araújo et al [ 27 , 33 ]. The microcrustaceans were obtained after 48 h of cultivation in a synthetic saline solution under continuous illumination and oxygenation.…”

Section: Methodsmentioning

confidence: 99%

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A Brief Photocatalytic Study of ZnO Containing Cerium towards Ibuprofen Degradation

et al. 2021

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Ibuprofen (IBU) is one of the most-sold anti-inflammatory drugs in the world, and its residues can reach aquatic systems, causing serious health and environmental problems. Strategies are used to improve the photocatalytic activity of zinc oxide (ZnO), and thosethat involvethe inclusion of metalhave received special attention. The aim of this work was to investigate the influence of the parameters and toxicity of a photoproduct using zinc oxide that contains cerium (ZnO-Ce) for the photodegradation of ibuprofen. The parameters include the influence of the photocatalyst concentration (0.5, 0.5, and 1.5 g L−1) as well as the effects of pH (3, 7, and 10), the effect of H2O2, and radical scavengers. The photocatalyst was characterized by Scanning Electron Microscopy-Energy Dispersive Spectroscopy, Transmission electron microscopy, Raman, X-Ray Diffraction, surface area, and diffuse reflectance. The photocatalytic activity of ibuprofen was evaluated in an aqueous solution under UV light for 120 min. The structural characterization by XRD and SEM elucidated the fact that the nanoparticle ZnO contained cerium. The band gap value was 3.31 eV. The best experimental conditions for the photodegradation of IBU were 60% obtained in an acidic condition using 0.50 g L−1 of ZnO-Ce in a solution of 20 ppm of IBU. The presence of hydrogen peroxide favored the photocatalysis process. ZnO-Ce exhibited good IBU degradation activity even after three photocatalytic cycles under UV light. The hole plays akey role in the degradation process of ibuprofen. The toxicity of photolyzed products was monitored against Artemia salina (bioindicator) and did not generate toxic metabolites. Therefore, this work provides a strategic design to improve ZnO-Ce photocatalysts for environmental remediation.

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Photocatalytic degradation of metronidazole (MNZ) antibiotic by CuO nanoparticles for environmental protection from pharmaceutical pollution

Banu

Rashid

Tofail

et al. 2023

Surface & Interface Analysis

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Metronidazole (MNZ) is one of the extensively consumed generic antibiotics, which, due to its high resistance to biological degradation, is considered a potent environmental contaminant. In this study, we use CuO nanoparticles (NPs) for photocatalytic degradation of MNZ. Photocatalytic NPs with a crystallinity of over 80% were synthesized using a facile co‐precipitation method followed by calcination at a temperature of 500°C for a duration of 1 h. NPs were characterized thoroughly to investigate their opto‐structural properties. We investigated the efficiency of photocatalytic degradation with the variation of MNZ concentration, NP loading and the pH of the MNZ solution. Experimental results revealed that the pH of the MNZ solution strongly controlled the photocatalytic degradation efficiency. As pH was increased from 7 to 11, the degradation rate was enhanced remarkably. Degradation efficiency was also found to be strongly dependent on the concentration of both MNZ solution and CuO NPs.

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Eco-friendly synthesis and photocatalytic application of flowers-like ZnO structures using Arabic and Karaya Gums

Cited by 40 publications

References 83 publications

Superabsorbent Hydrogels Based to Polyacrylamide/Cashew Tree Gum for the Controlled Release of Water and Plant Nutrients

Superabsorbent Hydrogels Based to Polyacrylamide/Cashew Tree Gum for the Controlled Release of Water and Plant Nutrients

A Brief Photocatalytic Study of ZnO Containing Cerium towards Ibuprofen Degradation

Photocatalytic degradation of metronidazole (MNZ) antibiotic by CuO nanoparticles for environmental protection from pharmaceutical pollution

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