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Role of additives to improve adsorption of xylan on precipitated calcium carbonate

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Abstract

The development of modified fillers is one of the most promising research outcomes that address the challenges of papermaking such as reduced production cost, improved optical properties, better formation and improved drainage rate. In the present investigation, an attempt has been made to evaluate the interaction of xylan with precipitated calcium carbonate (PCC) through adsorption process with an aim to design novel functional composite filler as an alternative to conventional filler used in papermaking. PCC-xylan interactions were found to be more favourable at 40 °C and at neutral pH. However, adsorption increased when calcium chloride (0.1 M) was introduced as background electrolyte at pH 10.5. Adsorption was found to reach its saturation level within 5 h. In order to maximize the xylan adsorption, the roles of various additives such as slaked lime, polyaluminium chloride (PAC), chitosan and cationic polyacrylamide (CPAM) were explored in this paper. Further, the adsorption isotherms of xylan conducted under various conditions were well fitted to the Langmuir model. Alternatively, dual systems comprising PAC/chitosan and PAC/CPAM showed the best result considering the application of the xylan based composite PCC filler in papermaking. It is also quite interesting to note that isotherms data were best fitted to the Freundlich model in presence of chitosan (6%) or CPAM (0.2%) along with PAC indicating complex multilayer adsorption mechanism.

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Acknowledgments

The research grant for this work was funded by the Ministry of Human Resources and Development, Government of India.

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Correspondence to Chhaya Sharma.

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Ghosh, I., Sharma, C. & Tandon, R. Role of additives to improve adsorption of xylan on precipitated calcium carbonate. Cellulose 25, 1583–1598 (2018). https://doi.org/10.1007/s10570-018-1666-x

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  • DOI: https://doi.org/10.1007/s10570-018-1666-x

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