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Wang, Zhike, Zhihang Chen, and Cunling Ye. Journal of the Taiwan Institute of Chemical Engineers 146 (2023): 104865.
Cetylpyridinium bromide (CPB), a cationic surfactant, has been effectively utilized to modify ZIF-8 frameworks, significantly improving their adsorption capacity for methyl orange (MO) dye. Through a post-synthetic modification strategy, CPB-functionalized ZIF-8 (CPB@ZIF-8) was fabricated by incorporating amphiphilic CPB molecules into the porous structure of ZIF-8. This modification introduces additional positively charged sites, hydrophobic domains, and aromatic rings, which enhance electrostatic attraction, hydrophobic interactions, and π-π stacking with MO.
The synthesis of CPB@ZIF-8 involves dissolving CPB in deionized water, followed by the addition of activated ZIF-8 and continuous stirring at 50°C for 5 hours. The modified framework is then separated by centrifugation, washed thoroughly, and dried. Despite a reduction in surface area and pore volume compared to pure ZIF-8, CPB@ZIF-8 exhibits superior MO adsorption efficiency. This enhancement is attributed to CPB's ability to modify the surface chemistry of ZIF-8, creating a highly effective adsorbent for anionic dyes.
The study underscores CPB's crucial role in adsorption-based wastewater treatment applications. By functionalizing metal-organic frameworks (MOFs) like ZIF-8, CPB contributes to the development of advanced materials with tailored adsorption properties, making it a valuable component in environmental remediation strategies.
Muñoz-Shugulí, Cristina, et al. Applied Clay Science 168 (2019): 203-210.
Cetylpyridinium bromide (CPB), a cationic surfactant, has been effectively used to modify montmorillonite (Mt) for the development of low-density polyethylene (LDPE) nanocomposites in food packaging applications. By intercalating CPB into the interlayer spacing of Mt, organoclays with enhanced dispersion and compatibility in polymer matrices were synthesized, leading to improved material performance.
Two different CPB-modified organoclays, 11OMt and 21OMt, were prepared by varying CPB loading (1.0 or 2.0 times the cation exchange capacity of Mt). The synthesis involved dispersing Mt in water, ultrasonic treatment, and subsequent reaction with a CPB solution under controlled stirring and temperature conditions. The resulting materials were filtered, washed to remove unbound surfactant, and dried before being incorporated into LDPE.
The CPB-modified Mt significantly improved the mechanical, thermal, and barrier properties of LDPE nanocomposites. The enhanced dispersion of the organoclay within the polymer matrix contributed to better reinforcement, making these nanocomposites promising for active food packaging applications. This study highlights CPB's crucial role in modifying clay structures to create high-performance polymer composites, demonstrating its potential in sustainable packaging technologies.
Guo, Yao, et al. Minerals Engineering 185 (2022): 107711.
Cetylpyridinium bromide (CPB) has been successfully employed as a dispersant in the flotation process to improve the separation efficiency of smithsonite from kaolin- and chlorite-containing ores. The presence of kaolin and chlorite in zinc ore flotation often leads to slime coating, reducing the floatability of smithsonite. CPB mitigates this effect by adsorbing onto kaolin and chlorite surfaces, preventing their attachment to smithsonite and thereby enhancing flotation performance.
In micro-flotation experiments, smithsonite samples were conditioned with CPB before the addition of the OCTA collector. The results demonstrated a significant improvement in smithsonite recovery when CPB was introduced. By neutralizing the hydrophobic interactions responsible for slime-coating, CPB ensured better separation efficiency, making it an effective reagent for optimizing the flotation process.
The application of CPB in mineral flotation highlights its potential as a tailored dispersant for overcoming challenges in complex ore processing. Its ability to selectively interact with gangue minerals enhances the viability of flotation-based beneficiation techniques, particularly in the extraction of valuable non-sulfide zinc ores.
