In this study, chitosan (CS)-sodium sodium tripolyphosphate (STPP) (CS-STPP) nanoparticles were fabricated via reverse microemulsion-ionic gelation method. A series of experiments were conducted to optimize the constitution of reverse microemulsion system and the obtained CS-STPP nanoparticles were then characterized by Fourier transform infrared spectrum (FT-IR) and scanning electron microscope (SEM). The concentration of Tween-80 and Span-80 were 6% and 2% respectively when the ratio of water phase to oil phase was 1/7. A narrow size distribution and good dispersion of the obtained CS-STPP nanoparticles were obtained when the stirring speed was 400 rpm/min, with diameter being 552 ± 14 nm. The FT-IR results for the CS-STPP nanoparticles also indicated that the CS was cross-linked with the STPP. These results are very important for the CS-STPP nanoparticles when used as drug carriers.
In this study, water‐soluble polymer carrageenan (CAR) was cross‐linked by dodecyltrimethylammonium bromide (DTAB) in an aqueous solution for the preparation of gel beads, which can be used for removal of methylene blue (MB). The combination of DTAB and CAR was validated by Fourier transform infrared (FTIR) spectroscopy, while the folded surface was characterized by scanning electron microscope. DTAB can be used as a modifier of CAR for promoting the hydrophobicity and stability of hydrogel beads, which even withstood 70°C in water for 24 h without dissociation. The best removal efficiency was achieved 99.6% in 100 mg L−1 MB aqueous solution by CAR‐0.5DTAB, and the maximum adsorption capacity of CAR‐1.5DTAB at 30°C reached 38.6 mg g−1 by wet weight (weight of gel beads in wet condition) in 2000 mg L−1 MB aqueous solution. The CAR‐DTAB adsorption behavior was best fitted with pseudo‐first‐order and Langmuir equations, respectively. The exothermic nature and spontaneity of adsorption process were proved by thermodynamic experiment. Reusability studies revealed that the adsorption performance displayed almost no change after 10 cycles of adsorption/desorption process. The properties of CAR‐DTAB in this research proposed a facile way to prepare stable CAR composite by cross‐linking with quaternary ammonium surfactant.
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