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http://dx.doi.org/10.7584/ktappi.2015.47.6.106

Adsorption Analysis of Fluorescent Whitening Agent on Cellulosic Fibers by Zeta Potential Measurement  

Lee, Ji Young (Dept. of Environmental Materials Science/IALS, Gyeongsang National University)
Kim, Eun Hea (Dept. of Forest Products, Gyeongsang National University)
Kim, Chul Hwan (Dept. of Environmental Materials Science/IALS, Gyeongsang National University)
Park, Jong Hye (Dept. of Forest Products, Gyeongsang National University)
Publication Information
Journal of Korea Technical Association of The Pulp and Paper Industry / v.47, no.6, 2015 , pp. 106-112 More about this Journal
Abstract
Many researchers have proposed analytical methods to measure the adsorption of di-sulpho fluorescent whitening agents (D-FWAs), but practical methods for D-FWA utilization in an actual paper mill have not been established. In particular, the D-FWA adsorption behavior must be monitored in paper mills to ensure the effective use of D-FWAs. This study used the zeta-potential of pulps as an indicator of the adsorption behavior of a D-FWA. We identified the relationship between the actual adsorption of the D-FWA and the zeta-potential of the pulps as a function of D-FWA addition. zeta-potential measurements were then used to analyze the D-FWA adsorption behavior under different conditions of pulp type, conductivity, and pH. The actual adsorption of a D-FWA was proportional to the ${\Delta}zeta-potential$ of the pulps (i.e., the difference between the zeta-potential of a pulp containing no D-FWA and one containing the D-FWA). The ${\Delta}zeta-potential$ of the pulps was therefore adopted for adsorption analysis. A higher adsorption of the D-FWA was observed onto Hw-BKP than onto Sw-BKP because of the shorter fiber length and higher fines content of Hw-BKP. A high conductivity and an acidic pH decreased the D-FWA adsorption because of direct effects of high ion concentrations and low pH on the D-FWA solubility. Therefore, a D-FWA must be added to Hw-BKP under low conductivity conditions and at neutral or alkaline pH to optimize the D-FWA adsorption.
Keywords
Fluorescent whitening agent; adsorption; zeta-potential; pulp type; conductivity; pH;
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Times Cited By KSCI : 2  (Citation Analysis)
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