“…Moreover, no sensible changes have been observed in peak position when the sample stored up to six months in the laboratory, indicating high stability of bioproduced NiO NPs in aqueous green media. Previous studies reported the optical absorption peak of biological NiO NPs in the range of 330–350 nm using green synthesis methods 24 , 25 , 46 which are in good agreement with our results. Figure 1 UV–visible spectra of ( a ) organic seaweed extract, and ( b ) optimization of biogenic NiO NPs as a function of time.…”
This research presents a novel biological route for the biosynthesis of nickel oxide nanoparticles (NiO NPs) using marine macroalgae extract as a reducing and coating agent under optimized synthesis conditions. XRD and TEM analyses revealed that phytosynthesized NiO NPs are crystalline in nature with a spherical shape having a mean particle size of 32.64 nm. TGA results indicated the presence of marine-derived organic constituents on the surface of NiO NPs. It is found that biogenic NiO NPs with BET surface area of 45.59 m2g−1 is a highly efficient catalyst for benign one-pot preparation of pyridopyrimidine derivatives using aqueous reaction conditions. This environmentally friendly procedure takes considerable advantages of shorter reaction times, excellent product yields (up to 96%), magnetically viable nanocatalyst (7 runs), low catalyst loadings, and free toxic chemical reagents.
“…Moreover, no sensible changes have been observed in peak position when the sample stored up to six months in the laboratory, indicating high stability of bioproduced NiO NPs in aqueous green media. Previous studies reported the optical absorption peak of biological NiO NPs in the range of 330–350 nm using green synthesis methods 24 , 25 , 46 which are in good agreement with our results. Figure 1 UV–visible spectra of ( a ) organic seaweed extract, and ( b ) optimization of biogenic NiO NPs as a function of time.…”
This research presents a novel biological route for the biosynthesis of nickel oxide nanoparticles (NiO NPs) using marine macroalgae extract as a reducing and coating agent under optimized synthesis conditions. XRD and TEM analyses revealed that phytosynthesized NiO NPs are crystalline in nature with a spherical shape having a mean particle size of 32.64 nm. TGA results indicated the presence of marine-derived organic constituents on the surface of NiO NPs. It is found that biogenic NiO NPs with BET surface area of 45.59 m2g−1 is a highly efficient catalyst for benign one-pot preparation of pyridopyrimidine derivatives using aqueous reaction conditions. This environmentally friendly procedure takes considerable advantages of shorter reaction times, excellent product yields (up to 96%), magnetically viable nanocatalyst (7 runs), low catalyst loadings, and free toxic chemical reagents.
“…Moreover, no sensible changes have been observed in peak position when the sample stored up to 6 months in the laboratory, indicating high stability of bioproduced NiO NPs in aqueous green media. Previous studies reported the optical absorption peak of biological NiO NPs in the range of 330-350 nm using green synthesis methods 17,18,30 which are in good agreement with our results.…”
This research presents a novel biological route for the biosynthesis of nickel oxide nanoparticles (NiO NPs) using marine macroalgae extract as a reducing and coating agent under optimized synthesis conditions. XRD and TEM analyses revealed that phytosynthesized NiO NPs are crystalline in nature with a spherical shape having a mean particle size of 11±1 nm. It is found that biogenic NiO NPs is a highly efficient catalyst for benign one-pot preparation of pyridopyrimidine derivatives using aqueous reaction conditions. This environmentally friendly procedure takes considerable advantages of shorter reaction times, excellent product yields (up to 96%), magnetically reusable nanocatalyst (7 runs), low catalyst loadings, and free toxic chemical reagents.
“…[11] Additionally, Xu et al [12] applied a soft templates method to produce mesoporous high surface area NiO for deep oxidation of CH 4 . Various publications have reported the green and biosynthesis of NiO nanoparticles by the aid of several biomaterials, such as Solanum trilobatum extract, [13] Ananas comosus leaf extract, [14] Cactus plant extract, [15] Okra plant extract [16] and Phoenix dactylifera extract. [17] Also, NiO nanoparticles successfully were synthesised using the ultrasonication technique.…”
Herein, the synthesis of pure and modified mesoporous nanocrystalline NiO is reported. The catalyst was modified with different wt % F-ions or K 2 O and used to produce Methyl ethyl ketone (MEK) as a potential fuel/solvent. XRD analysis of the promoted catalysts confirmed the formation of Ni-metal covered by the host oxide, compared with pure NiO, especially for the promoted catalysts with x wt % F-ions. CO 2 -TPD results demonstrated the existence of different basic sites over these catalysts with varying strength. The catalytic conversion of sec-butanol (SB) into MEK over the parent NiO catalyst showed 52 % and 76.8 % conversion of SB at 250 and 275°C, respectively, with higher selectivity to MEK > 96 %. Among the promoted catalysts, NiO-10 wt % F À and NiO-1 wt % K 2 O catalysts showed 99 and 95 % conversion, respectively, with retaining the MEK selectivity of � 96 %. The catalytic activity, of the most active catalysts, was correlated with the presence of Ni/NiO interfaces, different types of basic sites, especially strong basic sites, and the surface area and porosity measurements.
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