Effect of vacuum impregnation conditions on incorporation of potassium permanganate into zeolite 5A

Name: Silva, Ranbaranage Pramuda Manjith

LCSH: Kasetsart University -- Theses. M.S. (Packaging Technology) 2020

Classification :.LCCS: TA418.9.P6

LCSH: Kasetsart University. -- Department of Packaging and Materials Technology -- Theses.

LCSH: Porous materials

LCSH: Potassium permanganate

LCSH: Ethylene

LCSH: Zeolites

Abstract: Impregnation of active ingredients with porous materials becomes interesting for packaging applications due to the recent advancements in nanotechnology. Nanoporous materials possess versatile performances and allow modifications to their internal pore structures to increase the adsorption efficiency. Incipient wetness impregnation (IWI), in which porous materials are soaked with a solution of active ingredient at ambient pressure before drying to remove the residual solvent. Vacuum impregnation (VI), uses vacuum force to remove the residual air trapped inside the pores of porous matrix during loading the active compound solution under vacuum condition prior to drying to get rid of the remaining solvent. The objectives of this work were to determine the effective impregnation technique to incorporate potassium permanganate (KMnO4) into zeolite 5A (Z5A) and then investigate the effect of processing conditions on impregnation of KMnO4 into Z5A. Z5A was used as a porous matrix due to its microporous structure facilitating selective adsorption. KMnO4 was chosen as an active compound because it is considered as an effective ethylene scavenger. Initially, Z5A was impregnated with KMnO4 via IWI and VI techniques to compare the impregnation efficiency. Both impregnation techniques were performed using a constant concentration of KMnO4 (6%, w/v), KMnO4:Z5A ratio (1:1, v/w), temperature (27ºC), impregnation time (15 min), and ambient/vacuum (0.09 MPa) conditions. LC of KMnO4 obtained from IWI and VI, determined by UV-vis spectrophotometry, were in ranges of 1.58-1.75% and 5.04-6.94%, respectively. The results suggest that VI is more effective impregnation technique because the vacuum force facilitates the removal of air present inside the Z5A pores and thus allows more KMnO4 molecules to enter the pore channels. The effects of VI operating conditions, i.e. KMnO4 concentration (3 and 6 % w/v), KMnO4:Z5A ratio (1:1 and 2:1 w/v), temperature (27 and 60ºC), and impregnation time (15 and 60 min) on the LC of KMnO4 were investigated. LC of KMnO4 increased with increasing KMnO4 concentration and impregnation temperature, while the LC reduced with increasing impregnation time and KMnO4:Z5A ratio. GCFID analysis validated the effectiveness in ethylene removal performance of KMnO4 loaded Z5A, where they managed to remove ethylene twice faster than the commercial ethylene adsorber. This could be due to the highly microporous structures present in KMnO4 loaded Z5A in which the ethylene was adsorbed more.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Amporn Sane

Role: Thesis Advisor

Name: Vanee Chonhenchob

Role: Thesis CO-Advisor

Name: Pattarin Leelaphiwat

Role: Thesis CO-Advisor

Created: 2020

Modified: 2025-07-18

Issued: 2025-07-18

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2563/ranbaranage-pra-all.pdf

CallNumber: TA418.9.P6 .S55

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Packaging Technology

Grantor: Kasetsart University

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