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Updated: Jan 15, 2026

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
Published on: June 28, 2019
Synergistic enhancement of anionic pollutant adsorption: Dual-modified porous cationic potato starch
Jiting Wei1, Jianxiong Yue1, Qiyue Peng1
1College of Food Science and Engineering, Gansu Agricultural University, Lanzhou 730070, Gansu, China.
Abstract:
This study aimed to develop a novel eco-friendly and biodegradable cationic porous starch (CPS) adsorbent, fabricated from native potato starch via enzymatic hydrolysis. The synthesis of modified starch was verified using Fourier Transform Infrared Spectroscopy (FTIR) and Proton Nuclear Magnetic Resonance (1H NMR) spectroscopy. Also, the thermal stability of various modified starches was evaluated by thermogravimetric analysis, which demonstrated a reduction in stability after modification. Scanning Electron Microscopy (SEM) imaging revealed that dual modification through porosification followed by cationization imparted a mesoporous structure with distinctive surface texturing to the starch granules. Superior adsorption capacity for anionic dyes and metal ions was observed for CPS, particularly for Congo red, with adsorption capacities being 3.6 times and 5.8 times that of NS, respectively. This enhanced performance arose from synergistic interactions among the porous architecture, coordination bonding, and electrostatic attraction mechanisms. In conclusion, the potato starch modified through porosification and cationization exhibited effective adsorption capacity for metal ions and anionic dyes in contaminated aqueous systems. Overall, dual-modified starch had more advantages, combined the advantages of two kinds of modification, than single porosification in performance improvement.
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