Abstract
Highly positively charged poly(vinyl benzyl trimethylammonium chloride) (PVBMA) was successfully synthesized with approximately 81.8% of yield. The PVBMA was characterized by the molecular weight (Mw) of 343.45 g·mol-1 and the molecular weight distribution, (Đ) of 2.4 by 1H NMR and SEC measurements. The PVBMA was applied as an effective agent for α-Al2O3 surface modification in the adsorptive removal of the azo dye acid orange G (AOG). The AOG removal performance was significantly enhanced at all pH compared to without surface modification. The experimental parameters were optimal at pH 8, free ionic strength, 15 min of adsorption time, and 5 mg·mL-1 α-Al2O3 adsorbents. The AOG adsorption which was mainly controlled by the PVBMA-AOG electrostatic attractions was better applicable to Langmuir isotherm and pseudo-second kinetic model. The PVBMA-modified α-Al2O3 demonstrates a high-performance and highly reusable adsorbent with great AOG performances of approximately 90.13 % after 6 reused cycles.
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