Synthesis and characterization of SnO2 crystalline nanoparticles: A new approach for enhancing the catalytic ozonation of acetaminophen

Abstract

A novel sol-gel method was employed in this study to efficiently synthesize SnO 2 nanoparticles to catalyze the ozonation of acetaminophen (ACT) from aqueous solutions. The influence of various parameters including Sn source, type of capping and alkaline agents, and calcination temperature on the catalytic activity of the SnO 2 preparations was investigated. The SnO 2 nanoparticles prepared by tin tetrachloride as Sn source, NaOH as gelatin agent, CTAB as capping agent and at calcination temperature of 550 • C (SnNaC-550) exhibited the maximum performance in the catalysis of ACT. The optimized catalyst (SnNaC-550) had spherical-homogeneous and cubic-shaped nanocrystalline particles with 5.5 nm mean particle size and a BET surface area of 81 m 2 /g, which resulted in 98% degradation and 84% mineralization of 50 mg/L ACT at 20 and 30 min reaction time, respectively when combined with ozonation (COP). Based on the radical scavenger experiments, • OH was the major oxidizing agent involved in the removal of ACT. LC/MS analysis showed that short-chain carboxylic acids were the main intermediates. Furthermore, the SnNaC-550 catalytic activity was preserved after four successive cycles. Collectively, the new method has the potential to efficiently synthesize stable and reusable SnO 2 nanoparticles to catalyze the ozonation of ACT from aquatic environments.

Surface acidity of tin dioxide nanomaterials revealed with 31P solid-state NMR spectroscopy and DFT calculations

“…1,2 SnO 2 and SnO 2 basedmaterials have been widely used in a variety of elds including gas-sensing, 3 photovoltaics, 4 energy storage, 2,5 and acid catalysis. 6,7 In particular, SnO 2 nanomaterials, which are associated with a larger surface area and may expose specic facets, exhibit improved catalytic properties compared to their bulk counterparts. 8,9 Therefore, it is important to understand the details about the acidic properties of SnO 2 nanomaterials in order to develop better SnO 2 -based catalysts.…”

A catalytic ozonation process using MgO/persulfate for degradation of cyanide in industrial wastewater: mechanistic interpretation, kinetics and by-products

“…Therefore, reduction in ozone decomposition on the catalyst surface takes place. 63 However, the reduction in the presence of inorganic anions is negligible. Accordingly, it can be inferred that generated radicals are released into the bulk solution to react with the cyanide molecules, and the oxidation reaction mainly occur in the bulk solution rather than catalyst surface.…”

Removal of Paracetamol from Aqueous Solutions by Photocatalytic Ozonation over TiO2-MexOy Thin Films

“…This is the reason for a large number of studies regarding the development of catalytic systems capable of assisting the oxidative power of ozone mainly through the radical route. A large number of solids based on transitional metals in complex form or oxides, carbonaceous materials, etc., were studied for an evaluation of catalytic activity [22][23][24][25][26][27][28][29][30]. Additionally, catalyst precursors can be obtained from different industrial or agricultural wastes or pure metals salts.…”