Preparation, Characterization and Adsorption Performance of a Novel Anionic Starch Microsphere

Abstract

Neutral starch microspheres (NSMs) were synthesized by an inverse microemulsion technology with epichlorohydrin as a crosslinker and soluble starch as starting material. Anionic starch microspheres (ASMs) were prepared from NSMs by the secondary polymerization with chloroacetic acid as the anionic etherifying agent. Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and laser diffraction particle size analyzer were used to characterize the anionic starch microspheres. The results showed that structure of the microspheres was compact and the hardness of microspheres was great, and the average diameter of the product was about 75 µm. The anionic starch microspheres (ASMs) were used to adsorb methylene blue (MB) from aqueous solution. Effects of adsorption time, initial concentration of MB, and temperature on the adsorption of MB onto ASMs were studied, and the equilibrium and kinetics of the adsorption process were further investigated. It shows that ASMs can effectively remove MB from the solution. The adsorption equilibrium data correlates well with the Langmuir isotherm model compared with Frendlich isotherem model. The pseudo-first-order and pseudo-second-order kinetic models were applied to test the experimental data. The pseudo-second-order kinetic model provided a better correlation of the experimental data in comparison with the pseudo-first-order model. Temperature variations did not significantly affect the adsorption of MB onto ASMs.

Soluble starch–based biodegradable and microporous microspheres as potential adsorbent for stabilization and controlled release of coix seed oil

“…The phenomenon of aggregation was mainly attributed to the results of the emulsification and cross-linking process. Previous studies [14,20] reported that the size distribution of the droplets in the emulsion was wide when emulsified by mechanical stirring, which led to the aggregation and breakup of droplets during the emulsification and cross-linking process. So, the phenomenon of aggregation between SDM-Ms would appear.…”

Facile fabrication of magnetic carboxymethyl starch/poly(vinyl alcohol) composite gel for methylene blue removal

“…Starch, one of the most abundant renewable resources in the world has been investigated as an adsorbent to remove water pollutants [18][19][20][21]. For instance, Guo et al [22] synthesized a crosslinked porous starch and found that its adsorption capacity of product for methylene blue (MB) can reach 9.46 mg g −1 , which was much higher than that of native starch.…”

Adsorption of Brilliant Green Dye on Biochar Prepared From Lignocellulosic Bioethanol Plant Waste

“…They argued that any increase in the temperature beyond the optimum temperature decreased the surface activity of the adsorbent . Yang et al also found a similar endothermic–exothermic driven adsorption of methylene blue (cationic dye like BG) on starch material. The methylene blue adsorption process was endothermic at T ≤ 30°C but it became exothermic at >30°C up to 60°C.…”