Role of hydroxyl radical scavenger agents in preparing silver nanoparticles under γ-irradiation

Abstract

In the present work, silver nanoparticles (Ag 0 ) were synthesized under γ-irradiation from silver nitrate (AgNO 3 ) precursor salt, at room temperature in aqeous medium without adding any kind of catalyst. When aqueous solution of AgNO 3 , the surfactant poly vinyl alcohol and the isopropanol (or formic acid), which were used as hydroxyl oxidative radical scavengers agents were exposed to γ rays, Ag + ions were reduced to metallic Ag 0 by reactive organic radicals generated under irradiation. When using 2-propanol as free OH • radical scavenger in polyvinyl alcohol, which prevents Ag 0 from aggregation, densely dispersed silver nanoparticles coalesce to give 15 nm sized silver nanoparticles. The use of formic acid as free OH • radical scavenger leads to the production of 32 nm sized metallic nanoparticles. The effects of hydroxyl oxidative radical scavengers agents on the morphology and the size of produced silver nanoparticles were investigated.

Plasma-assisted nitrogen fixation: the effect of water presence

“…Therefore, we investigated the role of the processes (R24)–(R26), introducing a scavenger of OH radicals into the liquid phase. For this purpose, we used a 1% isopropanol water solution that reacts with OH as follows: 51,52 OH + CH 3 CHOHCH 3 → H 2 O + H 3 CCOHCH 3 , k 27 = 1.9 × 10 9 [M −1 s −1 ].…”

Preparation of Zr-Based Phosphotungstic Acid Catalyst, ZrPTAX-BTC, and Its Application in Ultradeep and Fast Oxidative Desulfurization of Fuels

“…In order to further reveal the synergistic catalytic effect between Zr IV and PTA in the process of ODS, a series of radical trapping experiments were carried out. Here, we first used benzoquinone (BQ) as a superoxide radical (O 2 ·) scavenger, − and isopropanol (IPA) as a hydroxyl radical (·OH) scavenger. − Here, we added 0.5 g of radical scavenger into the oxidative desulfurization reaction system, and this is excessive relative to the free radicals decomposed by H 2 O 2 in the system. Thus, the free radicals in the system can be quickly and fully captured.…”

Response Surface Optimization of Gamma Irradiation Synthesis of Alginate-Stabilized Silver Nanoparticles Without Addition of a Hydroxyl Radical Scavenger

“…Also, gamma radiosynthesis operates under simple physicochemical conditions that allow homogeneous reduction and nucleation of AgNPs [10,11]. However, radiosynthesis requires the addition of isopropanol as a hydroxyl radical scavenger to improve the reduction capacity of irradiation processing [12].…”