Effect of Recycling Number on the Fluorescence Reduction of Fluorescent Whitening Agents in White Wastepapers

Lee, Ji Young; Kim, Chul‐Hwan; Jo, Hae Min; Kim, Kyung Min; Kim, Su Ho

doi:10.7584/jktappi.2019.04.51.2.49

Cited by 3 publications

(3 citation statements)

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“…The excitation and emission wavelengths were 370 nm and 440 nm, respectively. The FWA reduction from model papers dyed with FWAs was calculated as an indicator that represents the FWA detachment from the paper by using the fluorescence indices before and after enzymatic treatments (Lee et al 2019).…”

Section: Evaluation Of Fwa Reduction From Model Papers Using Enzymesmentioning

confidence: 99%

“…The initial fluorescence index of the surface-sized paper was about 49%, and the fluorescence index of the handsheet decreased to 28% only after disintegration, indicating that disintegration led to 41% FWA reduction. This is because a large amount of starch and T-FWA was detached from the surface-sized paper owing to shear force and dissolved into the aqueous phase (Shi et al 2012;Lee et al 2019). However, there was no further FWA reduction when cellulase treatment was performed after disintegration.…”

Section: Fwa Removal From Two Model Papers Using Cellulasementioning

confidence: 99%

“…However, there was no further FWA reduction when cellulase treatment was performed after disintegration. This is because cellulase does not significantly affect starch dissociation and no chemical bonds are formed between T-FWA and cellulosic fibers (Walker and Hope 1963;Jayasekara and Ratnayake 2018;Lee et al 2019). Figure 7 shows the fluorescence emission of the supernatant from surface-sized paper with T-FWA after disintegration and cellulase treatment.…”

Section: Fwa Removal From Two Model Papers Using Cellulasementioning

confidence: 99%

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Effect of enzyme type on the control of fluorescent whitening agents during recycling

Lee

Kim

et al. 2020

BioRes

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The goal of this study was to develop an eco-friendly removal technology for fluorescent whitening agents (FWAs) using enzymes suitable for each type of FWA. Internally treated paper with internal FWA (D-FWA) and surface-sized paper with surface-sizing FWA (T-FWA) were made as model papers in a laboratory. The enzymatic treatments were applied to the stock prepared using these model papers by disintegration. Cellulase and (alpha-) amylase treatments were performed at 50 °C under the conditions of pH 3 to 4 and pH 7 to 8, respectively. After disintegration and enzymatic treatments, handsheets were made, and the fluorescence index and FWA reduction of these handsheets were determined for evaluating FWA removal during recycling. Because D-FWA gets strongly attached to cellulosic fibers, it could not be easily separated from the internally treated paper by disintegration. Up to 8.1% of D-FWA was removed by enzymatic treatment with high-activity cellulase. Amylase could not separate D-FWA from cellulosic fibers. In the case of T-FWA, ca. 41% was separated by disintegration, and an additional 24% was detached from surface-sized papers by high-activity amylase treatment. Therefore, cellulase was effective in removing internal FWA (D-FWA), and amylase was required for removing surface-sizing FWA (T-FWA) during recycling.

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Section: Evaluation Of Fwa Reduction From Model Papers Using Enzymesmentioning

confidence: 99%

Section: Fwa Removal From Two Model Papers Using Cellulasementioning

confidence: 99%