Successive advanced oxidation of pyridine by ultrasonic irradiation: effect of additives and kinetic study

Abstract

To cite this article: M.A. Elsayed (2015) Successive advanced oxidation of pyridine by ultrasonic irradiation: effect of additives and kinetic study, Desalination and Water Treatment, 53:1, 57-65, A B S T R A C TPyridine has received considerable attention from environmental scientists and engineers, due to its undesirable effect in the water environment. Pyridine contaminated wastewater presents a great threat on water resources safety. In this research, the degradation and advanced oxidation of pyridine in aqueous solution by ultrasonic waves were studied under various process variables including different initial concentration, H 2 O 2 , NaCl, and Fenton reagent. The results show that the degradation efficiency of pyridine decreases with the increasing of the initial concentration of pyridine. The removal rates of pyridine decreased from 52 to 15% with increasing the initial concentration from 10 to 100 mg/L. In the concentration range studied, the amount of H 2 O 2 and NaCl added has positive contribution on the degradation of pyridine. The removal effect of ultrasound and Fenton is better than ultrasound or H 2 O 2 alone acting on pyridine. A possible degradation pathway for pyridine was also proposed. In the end, it could be proposed that ultrasonic irradiation was an effective method for the removal of pyridine from wastewater.

Synthesis of 2‐O‐Functionalized‐5‐salicyloyl Pyridine Derivatives Catalyzed by 2‐Mercaptobenzimidazole

“…Finally, according to the reported absorption maximum ( λ max ) of pyridine in the literature (250 and 262 nm), [28] the nitrile and carbonyl functional groups and also the lone pair of electrons of alkoxy through resonance and extending of conjugated systems can cause the π electron delocalization in the pyridine scaffold. So, the presence of these moieties can increase the bathochromic effect of the λ max of pyridine to the longer wavelengths.…”

Applied techniques for residual oil recovery from source rocks: A review of current challenges and possible developments

“…This can produce a shock wave as a physical effect or even chemical bonding due to the O‐H radical's formation by water sonolysis. [ 91 ]…”

“…This can produce a shock wave as a physical effect or even chemical bonding due to the O-H radical's formation by water sonolysis. [91] Bitumen, that is, the soluble organic matter, can be extracted from the oil shale due to the bubbles' cavitation subsidence, which stimulates the mass transfer of the liquid-solid phases within the media, as illustrated in Figure 4. Figure 4 shows the continuous-loop ultrasonic/ co-solvent extraction system in which shale samples are treated with acid and water prior to extraction with ultrasonic-assisted waves and different configurations of potential solvents.…”

Intensified sonochemical degradation of 2-Picoline in combination with advanced oxidizing agents

“…Several studies have been conducted to treat wastewater bearing pyridine and pyridine derivatives like ultrasound coupled with advanced oxidation [4] , batch and column adsorption [5] , biodegradation using enzymes [6] , photo-Fenton [7] and ozonation [8] etc. Biodegradation generally does not treat larger concentration of effluent efficiently and operation is complicated, very slow and there is also difficulty in handling secondary waste.…”

“…Ultrasound assisted advanced oxidation method can considerably reduce the operation time and requirement of chemicals due to improved mass transfer and enhanced generation of radicals creating economically feasible oxidation processes. The earlier research based on removal of pyridine by Elsayed [4] using bath sonicator reported intensified degradation in the presence of oxidising agents such as hydrogen peroxide and Fenton reagent at irradiation power of 360 W and operating frequency of 40 ± 2 kHz. Literature analysis associated with 2-Picoline removal revealed that very few illustrations for removal from wastewater are seen and that too based on adsorption [9] and biodegradation [10] .…”