Abstract
To control road dust pollution, a starch/organo-bentonite composite liquid dust suppressant (CLDS) was successfully prepared. Potato starch was dissolved with NaOH solution at room temperature, and then sodium bentonite modified with cetyltrimethylammonium bromide (CTAB-bentonite) was incorporated before polymerization reaction. The CLDS was characterized by XRD, FTIR, TG and SEM. Its properties, dust-suppression performances, dust removal effects and economic feasibility had also been evaluated. The results suggested CLDS presented a porous three-dimensional network structure with numerous layers and folds, and residual CLDS could form a protective solidified layer together with dust via high viscosity after solidification, which effectively enhanced the absorption of CLDS on dust, delayed its water evaporation, and inhibited dust diffusion under windy weather. CLDS also had good thermal stability and biodegradability due to the addition of CTAB-bentonite. 2.5 wt% CLDS can dramatically improve dust-suppression effect and overcome dust resuspension problem to save water consumption and bring economic benefits.
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