Green synthesis of microalgal biomass-silver nanoparticle composite showing antimicrobial activity and heterogenous catalysis of nitrophenol reduction

Priyadarshini, Sushree Sangita; Sethi, Shradhanjali; Rout, Shweta; Mishra, Pravat Manjari; Pradhan, Nilotpala

doi:10.1007/s13399-021-01825-y

Cited by 13 publications

(4 citation statements)

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“…Because the calcination temperature was too low, the saturation magnetization decreased. Therefore, the samples calcined at 400°C should be used for the experiment 29 . Figure 5C showed the magnetization curves measured at different calcination temperatures.…”

Section: Resultsmentioning

confidence: 99%

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Superior adsorption of methyl blue on magnetic Ni–Mg–Co ferrites: Adsorption electrochemical properties and adsorption characteristics

Chen

Wang

et al. 2022

Env Prog and Sustain Energy

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The harm and treatment of methyl blue (MB) were described, and the necessity for the removal of MB by magnetic nanomaterials was explained. Magnetic Ni-Mg-Co ferrites were prepared by the rapid combustion approach of an active nitrate solution and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectrometer (FTIR), energy dispersive spectroscopy, and vibrating sample magnetometer. Magnetic Ni 0.1 Mg 0.7 Co 0.2 Fe 2 O 4 nanoparticles prepared at 400 C with the saturation magnetization of 19.7 emu g À1 and the average diameter of about 15.2 nm were used to adsorb MB from the aqueous medium. The Brunauer-Emmett-Teller (BET) analysis showed that the specific surface area was 143.17 m 2 g À1 and the average pore size was 9.44 nm. The adsorption mechanism of MB onto magnetic Ni 0.1 Mg 0.7 Co 0.2 Fe 2 O 4 nanoparticles was studied, and the results revealed that the adsorption properties conformed the pseudo-second-order kinetics model due to the square deviation values (R 2 > 0.98), and Temkin model could describe the adsorption state of MB onto Ni 0.1 Mg 0.7 Co 0.2 Fe 2 O 4 nanoparticles, which suggested that the adsorption of MB onto Ni 0.1 Mg 0.7 Co 0.2 Fe 2 O 4 nanoparticles was monolayer-multilayer hybrid chemisorption mechanism. When the pH value exceeded 3, the adsorbance reached large value; while, the adsorbance was 97.6% of the initial adsorption value for seven cycles. The electrochemical impedance spectroscopy and cyclic voltammetry curves of MB adsorbed onto the nanoparticles before and after the adsorption were determined.

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Section: Resultsmentioning

confidence: 99%

“…Therefore, the samples calcined at 400 C should be used for the experiment. 29 Figure 5C showed the magnetization curves measured at different calcination temperatures. When the calcination temperature increased from 400 C to 700 C, the M s value generally showed an increasing trend.…”

Section: Effects Of Element Ratios On Ni-mg-co Ferritesmentioning

confidence: 99%

Superior adsorption of methyl blue on magnetic Ni–Mg–Co ferrites: Adsorption electrochemical properties and adsorption characteristics

Chen

Wang

et al. 2022

Env Prog and Sustain Energy

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“…The main advantages of microalgae for the synthesis of NPs are the speed of growth and the low need for nutrients to carry out the production of algae, compared to the use of vascular/ flowering (higher category) plants. 28,71 Furthermore, it is noteworthy that microalgae, due to their ability to accumulate metals, are potent bioagents for removing heavy metal pollutants, suggesting that the capacity to biosynthesize NPs is a mechanism by which microalgae detoxify excess bulky metals in their niche or medium, which could otherwise be toxic and hazardous, demonstrate promising abilities to absorb and transform heavy metals into reduced toxic forms during wastewater treatment. Their redox processes facilitate detoxification and can alter gene expression in response to toxicity, overcoming intracellular metal concentration by binding to internal ligands and the cell surface.…”

Section: Advantages Of the Green Synthesis Of Nps From Microalgae Vs ...mentioning

confidence: 99%

Microalgae as a potential natural source for the green synthesis of nanoparticles

Arteaga-Castrejón,

Agarwal,

Khandual

2024

Chem. Commun.

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“…The reduction of 4-NPh, performed in the presence of NaBH 4 at room temperature and using the catalysts listed above, is expected to take place in two steps [51]. Firstly, the 4-NPh is spontaneously converted to p-nitrophenolate ion (4-NPh -) by the addition of NaBH 4 (pH reaction medium ~11, pK a(4-NPh) = 7.1) [52], which changes the color of the solution from pale to deep yellow.…”

Section: Catalytic Performancementioning

confidence: 99%

Highly Efficient and Magnetically Recyclable Non-Noble Metal Fly Ash-Based Catalysts for 4-Nitrophenol Reduction

Kuźniarska-Biernacka,

Ferreira,

Monteiro

et al. 2023

Catalysts

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4-nitrophenol (4-NPh) is a harmful compound produced in large amounts in the chemical industry, and its reduction to aminophenol (4-APh) using noble metals as catalysts is one of the most studied processes. The development of noble metal-free catalysts represents an economic advantage in large-scale applications and contributes to the sustainability of raw materials. Coal fly ash (FA), a major waste stream from coal combustion, contains an easily recoverable magnetic fraction (FAmag sample) composed of Fe-rich particles that could substitute noble metal catalysts in 4-NPh reduction, with the concomitant advantage of being easily recovered via magnetic separation. For this purpose, a new composite material containing copper ferrite nanoparticles (FAmag@CS@CuFe) was prepared via a facile, environmentally friendly and cost-effective method based on three components: FAmag as the core, a biobased polymer chitosan (CS) as the linker and copper ferrite CuFe2O4 nanoparticles (CuFe) as the active sites. The structure, morphology, composition and magnetic properties of the FAmag@CS@CuFe material were studied to assess the efficiency of the preparation. It was found that the biopolymer prevented the aggregation of CuFe nanoparticles and enabled a synergistically outstanding activity towards the reduction of 4-NPh in comparison to the pristine FAmag and bare CuFe nanoparticles. The FAmag@CS@CuFe catalyst showed efficiency and stability in the conversion of 4-NPh of up to 95% in 3 min over four consecutive cycles. Such remarkable catalytic results demonstrate the potential of this catalyst as a substitute for expensive noble metals.

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Green synthesis of microalgal biomass-silver nanoparticle composite showing antimicrobial activity and heterogenous catalysis of nitrophenol reduction

Cited by 13 publications

References 50 publications

Superior adsorption of methyl blue on magnetic Ni–Mg–Co ferrites: Adsorption electrochemical properties and adsorption characteristics

Superior adsorption of methyl blue on magnetic Ni–Mg–Co ferrites: Adsorption electrochemical properties and adsorption characteristics

Microalgae as a potential natural source for the green synthesis of nanoparticles

Highly Efficient and Magnetically Recyclable Non-Noble Metal Fly Ash-Based Catalysts for 4-Nitrophenol Reduction

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