SOLUTION BEHAVIORS AND ADSORPTION CHARACTERISTICS OF SODIUM LIGNOSULFONATE UNDER DIFFERENT PH CONDITIONS

Yong Qian, Yonghong Deng, Conghua Yi, Haifeng Yu, Xueqing Qiu

Abstract


Solution behaviors and adsorption characteristics of sodium lignosulfonate (NaLS) were studied under different pH conditions. The changes of Mw and particle size of NaSL with solution pH were detected by laser light scattering (LLS). Film thickness was determined with a spectroscopic ellipsometer, and surface roughness was measured by atomic force microscopy (AFM). The results showed that NaSL aggregated in acidic water, and the degree of aggregation decreased with increasing pH. When solution pH increased, the Mw of NaLS decreased, indicating that the intermolecular aggregates of NaLS were disaggregated at high pH. In the meantime, the ratio of Rg/Rh decreased, suggesting that the intrastructure of NaSL was changed from compact to loose. When the NaSL with loose structure and low degree of aggregation was adsorbed on a solid substrate, the adsorption thickness and the surface roughness decreased correspondingly.

Keywords


Lignosulfonate; Aggregation; Conformation; Adsorption; pH

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