Synthesis Of ZnO Nanoparticles For Microwaveinduced Rapid Catalytic Decolorization Of Congo Red Dye

Zuas, Oman; Budiman, Harry; Hamim, Nuryatini

doi:10.5185/amlett.2012.12490

Cited by 13 publications

(6 citation statements)

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“…However, some available reports demonstrate that such approaches are inefficient, expensive, require more effort and also result in secondary waste products, which may need further treatments [32]. The advanced oxidation processes (AOPs) employing photo-assisted reactions have been widely exploited for the degradation of azo dyes [33][34][35]. The comparative effectiveness of such processes results from the generation of highly reactive hydroxyl radicals which decolorize soluble and insoluble dyes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis Of Air Stable Copper Nanoparticles And Their Use In Catalysis

Soomro¹,

Sirajuddin²,

Memon³

et al. 2014

Adv. Mater. Lett.

111

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The undertaken study describes synthesis of air resistant copper nanoparticles (Cu NPs) in an aqueous phase using sodium borohydride as a reducing agent via chemical reduction method. The hydrosol has resistant to oxidation by atmospheric oxygen for several days. The air stability was induced by capping Cu NPs with anionic surfactant "sodium dodecyl sulfate (SDS)". Ascorbic acid was used as an antioxidant. These Cu NPs were characterized by ultraviolet-visible (UV-VIS) spectroscopy, which contributed towards the understanding of surface plasmon resonance (SPR) generation and optical behavior of Cu NPs. It was used as an optical tracer for size control and confirmation of Cu NPs and was found to be affected by various parameters like reaction time, pH, concentration of copper sulfate and the surfactant SDS. SPR peaks were found to shift from 597 to 569 nm, while apparent color changes from yellow to brick red. Further characterization studies were carried out by using fourier transform infrared (FT-IR) spectroscopy to investigate the co-ordination between Cu NPs and SDS. X-ray diffraction (XRD) was used for phase purity of Cu NPs. Transmission electron microscopy (TEM) and atomic force microscopy (AFM) were used the size and morphological characterization. The average size of the Cu NPs was found to be 15 nm in diameter with an average height of 14 nm. The Cu NPs showed excellent catalytic activity in the reductive degradation of Eosin B (EB) dye in just 16 sec of reaction time and maintained their catalytic activity when reused multiple times. The degradation rate was found to follow first order reaction kinetics with the EB degradation. The Cu NPs enhanced the rate of EB degradation 30 times more than the control test. Copper was found an attractive catalyst in the nanosize regimes. The Cu NPs are more economical as compared to noble metals. The Cu NPs are expected to be suitable alternative and play an imperative role in the fields of catalysis and environmental remediation.

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Section: Introductionmentioning

confidence: 99%

Synthesis Of Air Stable Copper Nanoparticles And Their Use In Catalysis

Soomro¹,

Sirajuddin²,

Memon³

et al. 2014

Adv. Mater. Lett.

111

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“…FTIR spectra of ZnO‐NPs prepared in RP water extract was carried out to detect the biomolecules that are responsible for capping and efficient stabilisation of the NPs. The absorption peaks at 615 and 681 cm −1 related to the stretching vibrations of ZnO bonds [33, 34]. These peaks indicated the presence of ZnO‐NPs.…”

Section: Discussionmentioning

confidence: 99%

Bio‐green synthesis ZnO‐NPs in Brassica napus pollen extract: biosynthesis, antioxidant, cytotoxicity and pro‐apoptotic properties

Shahraki

Tabrizi

Moghaddam

et al. 2019

IET nanobiotechnol.

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The bio-green methods of synthesis nanoparticles (NPs) have advantages over chemo-physical procedures due to cost-effective and ecofriendly products. The goal of current investigation is biosynthesis of zinc oxide NPs (ZnO-NPs) and evaluation of their biological assessment. Water extract of Brassica napus pollen [rapeseed (RP)] prepared and used for the synthesis of ZnO-NPs and synthesised ZnO-NP characterised using ultraviolet-visible, X-ray diffraction, Fourier-transform infrared spectroscopy, field emission scanning electron microscope and transmission electron microscope. Antioxidant properties of ZnO-NPs, cytotoxic and pro-apoptotic potentials of NPs were also evaluated. The results showed that ZnO-NPs have a hexagonal shape with 26 nm size. ZnO-NPs synthesised in RP (RP/ZnO-NPs) exhibited the good antioxidant potential compared with the butylated hydroxyanisole as a positive control. These NPs showed the cytotoxic effects against breast cancer cells (M.D. Anderson-Metastasis Breast cancer (MDA-MB)) with IC 50 about 1, 6 and 6 μg/ml after 24, 48 and 72 h of exposure, respectively. RP/ZnO-NPs were found effective in increasing the expression of catalase enzyme, the enzyme involved in antioxidants properties of the cells. Bio-green synthesised RP/ZnO-NPs showed antioxidant and cytotoxic properties. The results of the present study support the advantages of using the bio-green procedure for the synthesis of NPs as an antioxidant and as anti-cancer agents.

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“…The greater sorption capacity of the as-synthesized ZnO NPs with respect to the annealed ZnO may be due to a larger surface area of the as-synthesized NPs. As a result, more adsorption sites for the MO adsorption in as-synthesized ZnO than the annealed, causing in the quick MO sorption and significant MO abstraction from an aqueous solution [34][35][36]. …”

Section: Dye Removal Applicationmentioning

confidence: 99%