Impact of pH on the stability, dissolution and aggregation kinetics of silver nanoparticles

Fernando, Ishara; Zhou, Yan

doi:10.1016/j.chemosphere.2018.10.122

Cited by 163 publications

(94 citation statements)

References 31 publications

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“…e absorbance value has increased gradually with increasing pH range from 2 to 10 (4.7 initial pH), suggesting that the rate of formation of AgNPs is higher in basic pH than in acidic pH. e formation of AgNPs occurs rapidly in neutral pH, and in the basic pH, it may be due to the ionization of the phenolic group present in the extract [29][30][31]. e slow rate of formation and aggregation of AgNPs at acidic pH could be related to electrostatic repulsion of anions present in the solution.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Silver Nanoparticles Using Orange Peel Extract Prepared by Plasmochemical Extraction Method and Degradation of Methylene Blue under Solar Irradiation

Скіба

Vorobyova

2019

Advances in Materials Science and Engineering

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In pursuit of greener nanoscale research, the utilization of the reductive potency of a common byproduct of food-processing industry, i.e., orange peel, has been researched to prepare "green" silver nanoparticles (AgNPs). e synthesized AgNPs were characterized by UV-Vis spectroscopy, dynamic light scattering, and scanning electron microscopy. e results confirmed that silver nanoparticles were formed at the investigated concentrations of Ag + (0.25-6.0 mmol/L) during 5-10 minutes, at ratio AgNO 3 : extract (mL) � 1 : 1, and at 75°C. From the SEM images, the silver nanoparticles are found to be almost spherical. Powder XRD results reveal that Ag nanoparticles had a face-centered cubic crystal structure. e zeta potential value for AgNPs obtained was − 21.7 mV, indicating the moderate stability of synthesized nanoparticles. e effect of pH on nanoparticle synthesis has been determined by adjusting the pH of the reaction mixtures. e catalytic effectiveness of the prepared green catalyst, AgNPs, has also been investigated in catalytic degradation of methylene blue (MB) dye. e catalytic degradation reaction under solar irradiation was completed (99%) within 35 min, signifying excellent catalytic properties of silver nanoparticles in the reduction of MB.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Silver Nanoparticles Using Orange Peel Extract Prepared by Plasmochemical Extraction Method and Degradation of Methylene Blue under Solar Irradiation

Скіба

Vorobyova

2019

Advances in Materials Science and Engineering

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“…The AgNPs may experience incompatibility with the absorption activity due to the changes in their state, surface charge and morphology. The formation of an oxide layer onto the AgNPs' surface may be possible at a low pH due to the impact of the dissolution oxidation process and silver nanoparticles may turn to silver oxide (Ag 2 O) [17]. While highly alkaline, precipitation of nanoparticles may occur [27].…”

Section: Resultsmentioning

confidence: 99%

“…Before conducting measurements, we looked for previous reports that described an interpretation of how the pH solutions affect the silver nanoparticles' stability in any medium. Ishara and Yan [17] synthesized uncoated silver nanoparticles by chemical reduction method using silver nitrate and sodium borohydride. They varied particles colloidal in acidic and basic solution in pH range of 5-8 and found that the nanoparticles size decreased when pH values increased.…”

Section: Introductionmentioning

confidence: 99%

Super Stability of Ag Nanoparticle in Crystalline Lamellar (Lc) Liquid Crystal Matrix at Different pH Environment

2019

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The symmetry concept in this paper is related to the natural self-assembly of noble metal nanoparticles in the long range periodic structure of liquid crystal (LC). The current study deliberates the effect of pH on the stability of nanoparticles (NPs) in the lamellar phase of a lyotropic LC environment. The LC was prepared by the mass ratio 0.33:0.22:0.45 for (HDTABr):1-pentanol:water. The LC containing silver nanoparticles (AgNPs) was prepared by replacing the water with Ag solution. The AgNPs were produced by the in situ preparation method in LC. The solution of AgNPs-LC was varied at different pH. The absorption intensities were determined by using ultra-violet spectroscopy (UV-vis). The surface potential and hydrodynamic particle size were determined by using Zeta-potential (measurements). The surface enhanced Raman spectroscopy (SERS) was carried out to enhance the Raman signals of 4-aminobenzenethiol (4-ABT) deposited onto AgNPs as substrate. It is found that all characterizations exhibited super stability for AgNPs dispersed in LC at pH = 3 to 12 with the optimum stability at pH = 5–6. The remarkable stability of NPs is an important indicator of the various applications in nanotechnology and nanoscience fields.

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“…Molekul perak sulfat (Ag2SO4) tersusun atas kation Ag + perak (189)(190)(191)(192)(193) dan anion sulfat (SO4 -2 ). Setiap ion mempunyai laju yang berbeda-berbeda.…”

Section: Pergerakan Molekul Ag2so4unclassified

SILVER SULFATE (Ag2SO4): MOLECULAR ANALYSIS AND ION TRANSPORT

Yurmaniati¹,

Zainul²

2018

Preprint

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Abstrak Perak sulfat merupakan garam anorganik dengan rumus Ag2SO4. Perak sulfat ini termasuk dalam senyawa ionic karena terdapat ikatan antara logam perak dengan spesi non logam sulfat. Perak sulfat memiliki. berat molekul yaitu 311,799 gr/mol dengan tampilan kristal tidak berwarna dan tidak mudah terbakar. Senyawa ini digunakan dalam penyepuhan perak (silver plating) dan pengganti tanpa noda untuk perak nitrat. Perak Sulfat mengalami interaksi molekul dalam pelarut Air. Tujuan penelitian ini adalah untuk mengetahui karakteristik molekul dan transpor ion Perak Sulfat. Metode yang digunakan dalam penelitian ini adalah penelusuran literatur dengan Endnote X7, pemodelan komputasi, dan perhitungan matematis. Data transpor ion Perak Sulfat yaitu dengan parameter konduktivitas, viskositas, mobilitas ion, dan daya hanyut menggunakan data hasil review beberapa jurnal penelitian yang berkaitan dengan Perak Sulfat sesuai tahapan pada fishbone. Secara termokimia, perak sulfat memiliki entalpi pembentukan standar, ΔfHo 298 -715 kJ/mol dan entropi molar standar, So298 16,74 kJ/mol. Kelarutan Perak Sulfat dalam air yaitu 0,79 gr/100 mL (20 o C) dan dapat larut juga dalam pelarut asam nitrat. Hasil penelitian konduktivitas larutan Ag2SO4 semakin meningkat seiring dengan kenaikan konsentrasi persen massa sesuai grafik hasil perhitungan. Energi optimasi MM2 Minimization, Optimasi MM2 Dynamics, dan Optimasi MM2 Properties berturut-turut yaitu 210. 2194 kcal/mol, 755. 377 kcal/mol, 216. 774 kcal/mol. Kecepatan hanyut molekul perak sulfat dengan potensial Ag2SO4 3,61 V dan jarak antara elektroda 1,5 cm yaitu 2, 407 V/cm. Kata kunci : Perak Sulfat, Interaksi molekul, Pemodelan I. IntroductionPerak sulfat (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) merupakan senyawa ion dari perak dengan rumus Ag2SO4, yang digunakan dalam penyepuhan perak (silver plating) dan pengganti tanpa noda untuk perak nitrat. Garam sulfat ini stabil di bawah kondisi penggunaan dan penyimpanan biasa, meskipun ia menjadi gelap pada pajanan terhadap udara atau cahaya. Perak Sulfat (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) mengalami interaksi molekul dalam pelarut Air. Berat molekul senyawa ini yaitu 311,799 gr/mol dengan tampilan kristal tidak berwarna. Kelarutannya dalam air 0,79 gr/100 mL (20 o C) dan dapat larut juga dalam pelarut asam nitrat. Secara termokimia, perak sulfat (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) memiliki entalpi pembentukan standar, ΔfHo298 -715 kJ/mol dan entropi molar standar, So298 16,74 kJ/mol. Perak sulfat (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) tidak mudah terbakar.Perak Sulfat (Ag2SO4) (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) memiliki konduktivitas (1)(2)(3)(4)(5)(6)(7)(8)(9)(10) . Besarnya nilai konduktivitas (1-10) ditentukan oleh konsentrasi elektrolit. Muatan dalam senyawa dapat dibawa dalam bentuk electron seperti logam atau biasanya digunakan ion positif dan ion negative seperti dalam larutan elektrolit dan leburan garam. Aliran listrik dapat ditemukan dalam suatu larutan karena terdapat di ...

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Impact of pH on the stability, dissolution and aggregation kinetics of silver nanoparticles

Cited by 163 publications

References 31 publications

Synthesis of Silver Nanoparticles Using Orange Peel Extract Prepared by Plasmochemical Extraction Method and Degradation of Methylene Blue under Solar Irradiation

Synthesis of Silver Nanoparticles Using Orange Peel Extract Prepared by Plasmochemical Extraction Method and Degradation of Methylene Blue under Solar Irradiation

Super Stability of Ag Nanoparticle in Crystalline Lamellar (Lc) Liquid Crystal Matrix at Different pH Environment

SILVER SULFATE (Ag2SO4): MOLECULAR ANALYSIS AND ION TRANSPORT

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